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Home My WebLink AboutMisc-----------~----------------------------------Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print ) Name: ____ µ..i~t.,;...~=...\.L,l""'-"2------------------------ Telephone No.: '2-5 ,..,2 -'3 S'-j -I(, :l-cJ r f §!f 1. I\.) i' ii' ,I () j',j@ . . -0 Ouil CJ - • CD = 0 > --""' m g -= (/) .,__ Ouil . l=J Mailing Date: December 211, L004 = -------------=---=-===-======================--== Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print)~\ ' .I$\ \ uY\ ee \c V Name. _ \ \, v \ \J rt: Address: 12\ ~ I 5£ I e fv 5T Telephone No.: L\?.-CS-2.St,j -12.90 I ...... ~ - b1i~ ;>< () 0 ·i ~ ~ t, ;,, i~ ~ r 0 L r r §Ir I I$ f j ii • ,I ~ {iiii] ,~ @ .. tJ -{iiii] CD = ~ c;;s .-{iiii] \,_CJJ 'Ir . If t9 f 't --; '; Htl•'I (if;; !riJ I ;nm .,, fi"!f {Nhf • •1 ~Bf i!alfil i .. ·~· •I. t \ I -------------==-=================-=========-====== ~*ld--nii!~tw· ·cation of the public hearing and other official notices concerning this application . .j'eos-~~PreliminaryPlat -F/eut/e C('es L/cJ/!es ( Please print) :': _ E . I _ Name: Lg _h ~ ~ Address: /Ofo.5 8 R/t11'c:>rct. 1Qce Telephone No.: 20, -=64, -:¥?? !?' (5 i PAR1YOF.i : RECORD.: -----------------=-=============================== Please sen.:! tification of the public hearing and other official notices concerning this application. File o. L04P0002-Preliminary Plat -F/eu,/e G"'e_s c/o,/e..s ( Please print) p L' D Name: ~.oec CC? L.>rC)CV?7 Address: 6 8: 3''z /2'qyen,rzcr Ar:e. /'/ £_, 5;.gacft4:, ?J4 Telephone J\lc. 20b -S :2.:2-. -~ :S 7 8-' 9 ~ / / S . PAR1YOF I i RECQRD ... Mailing Date: December 28. 2004 =================================~================ Pteasa oano me notification of the public hearing and other official notices concerning lhis application. File No. L04P0002 -Soos Croek Prellmlnay Plat Mailing Date: December 28, 2004 ---------=------====-============================= Please send me notification of the public hearing and other official notices concerning this application .. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print ) (' /, r . I ' Name: .:} rJCli.tJQ \;;;_ (v l fl Address: I~&~~ /ilO d1 /tuc' TelephoneNo: 4:15-J7/-3310 -----------------------------------~------~-- -2E) 1111 f :>< [iuiJ Cl F~@ 0 "::'.. liiiil 'o = = m 8~ 1ffi ~ 1 (J) -liiiil @ L r r §II , Ir ~ •t P,ttin rrn i !ii{ J ~Bl 'i!~IIJ'I I i , 't ·11WI I\) if J 1,1 i f .• ,. I • 'i \~.!f fi"!f •ff. • ,I . , . ~~~~---------------------~---------------Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print) ._ · Name _::> (! (')_ VI ....- Address 1 S \,~S' \ d\~T L I f'\_\ 0 ,::::i PL ~E Telephone No. 'l-S -~ ~ f'Sl,_, ']t{ ;;)i./ LrJ A(Lfl8r0 {) l-C) -bb '1 6 O'.;:)O ·. Mailing Date: December 28, 2004 --------------=-------=-===-=======-===--==-===--= Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print ) Name: MaxlL + .:1uce. \Ali \Sol"l I • Address: IC\1.05 12-L\*1 fin,e Sf", \<U\TOr), WI\ Telephone No.: 20"':,)-813-3534 1~~ 20 " {jin] 9 <~ I! i-n@ ..., 0 -{jin] ·~ 1 ~ b en = u '\.) r jn g~ (/) -Ginl CoJ ; r r §If 'Ir ~ ., ~tl·'f rru j 11·· 1 ~Bf i?.u11•1 .u I I\)' ~ f f 't ijl~ 1(11. i • f~ ~·!, iii. 11 i *" .. , • •• Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat 1111 § () h@ ..., 0 -liiru b a> = m 8 cc€ h ~ r (/) .... -liiru Cc::> J CL r i §Ir 'Ir ~ •1 P.f!iil FH t Uiif . ~Bi ·c:r~111 I i I . 't . r ; •i·I I\) f ' ,lt~•h r1f i • 'i ~·!, hi . ,I 1"" • . , I I --------------------------- Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print) 1 J Name: ____ ~.____ . .,_)'TG:V_,_,_-""""f_-~~t-·'-",4'-=L-'LA=c...L~D~t_A/ _________________ _ Address : ___ _:le_' '1.,_,__I _:__I 8""--------'-'/ 2::::,__,_1 ______;Pc...=L:....,_Ac:,,,C."'-C----=-=-S-=£=---__ ;:,---=.e_,v_=:....:f O=A::____,.-/_W,-'-"-'A.:....__'1_3_0_5-'--"& Telephone No. 2 S 3 -'3 S 2 -7 I 1./ 3 111 ~c 0 H@ .. ,, 0 -[iui] n ~~ "1 · .,. = m E:J cg (/) C> r1 1 _,,. [iui] J @ r l 11~ 1J! e I I u11,n Pt:~ J''i ~ ~BI r?.;liii. I I\.) i! 't ;fl~I • f ;Jfi t ' ru If • E"!f i ltP~il I .., .. , • ... . , I I -V • ';;, -~. ', " 0 -~ f' .i, J 6 _:;, 0 """) > <;) j Q ~ '1- 3 -~ ~ ci ·- ... ···N- .. - ··-... - )'I'• ., .. , ::•.l ., •• J Tim a Bnmifie Wheeler 121.31 S.E. 188thSt. Kmwn. WA 98058 -,":'Li:-;~.-~ 0 D'} <P V::, 11, CO ·~, SD . I '" ·· .. / '···~" "' l ----·-- l)lLp-\-0 f \)i\}Q\up \'\eJ- L-wx) llSQ 'p.fu\'C"'S ))~ 1~,-vU q ct) Cb to~ \e,, AvQ_ A.XJ!_ S:'t\f-h \,LP§ \(_Q.A,~ r wczi ~ \o,0 q 80S 5-I l (q ..-,-"" .... -· -.-:.-.~.,...........-.... , ~ . C' i:1£ -.... ......-, \ \ --' -~_...,.-,.,,... _, --~Y,-...J.· '-I -----,-~-.· -. ' </ ~, -..... -~-,\ \?·\-_- "'· c;.> ---··----·-·-~j0J~~~1~,-~ 11: I: J J i1 :: :1l :f: :i: i 1,,, !1::I J: Ji/:/: :i ;I: il:i i ! : :ii ii :, 1 ., .. ,. u'u·,,ii:~-----.' 1)//MiJ (' Q · 7 I Id f, -I r:o Q 1 c.. ·v n I J..V '-'V Lang Associates, Inc. Land Use & Development Consultants 10658 Riviera Place NE Seattle, WA 98125-6938 Ms. Kimberly Claussen Planner Ill King county DDES-LUSD 900 Oaksdale Ave. SW Renton, WA 98055 ./ (' ' '"'·· ',-..._ ~:.~.-\ 1 . ·, __.,,/ ---------~-.- rr1· 7'" r_~) .r I l. r • I'. r (/ . . ' (_ ' (_ ' r 1 I ' ,-, ' ( /) ··-- '380:::.:=::.+ i 2 i ·:t. II, I,, i, , i, ii, , , , 1, i, , i, 1,, , , 11, , /, I, , , ii I, ill i , i, , l, i, , l l i, H ~- Annette M & Shawn Ervil 18848 120Th Ave SE Rentoo, WA 98058 .._., rf'~:,. ~ ro •• I -27 1: ,'" / ..... --, l . . ' ---- /(:_:r.:s~ CP~-} ,:• ,,_··.··,;_' .. fill ,j·;_-:: ... :1. ·. -: :r,:-_: rr-··,;): · · . \ . -.~ -----_· - [ .. b¥1f~ck~~i~~, ~-:::~ Svv~ ~;-!,~~ , ·.· • (_; . 9t)O~~Sw ?~r !ult 'roOS-5-/c)_!f ''.:H~r:.,':".:'.-~-·\-\. ·2.. 1. -~ ILL1L; I! llrn ,l;L; 1 ,Li ,IL J L ·,LI/, i,, ,,:= ,/, L. ] < ., , ',... '\;) v1 " ' i '1 ' : -~ ' \ ' E \ \ .,., I \l ' ' ) 1 C ;;:, , .. ' 1 t ' ' l ') '-•.. ~ \).._ .w,_ ~ Jl '-,J 11 ... ·~\ ? ... ~ -/.,, "s!-Q ... I :.,_/ ..c:. --, I ~ -'/) .. \; •• F n_ ' /) -1,r:, ... ~) / -j \' ,, :::, C) ... i ', •• "' (),o ~ I f ~ ... ,-·- """ \J ... ~ ~ ... _£ ... '-J ,,) --·- 0 ~ ? -:i -i. () "" 0 ('/ ~ II: ....1 ,..--.. ..,.;) -l Q i C .,:' ,"' () ~ a° '"\ 'Ji ; (j) ;J ' . n . ·. \ ,-> ' :_L c· i•. I , ·- '(>/. " I p. ·~ I j~, ,Jl <i \.f\ lD s3 0 -~ 0,0 ? cr- J -% 1/i a: ~ ..:,J. ~ 8 -::s - VJ C 1 { l1J 0 D 0 r£. D ~ Mr. Harold Hodge 19210 121st Pl SE Renton WA 98058-7545 • :::!t:~;_;;::,:-;./ ·::;·:J":f:: HJ II' h '""--"'" r? \ C he ·-----'"~-...~ ·-,-~ na-.,~,-,'>'. ---=----,.,,.,,, ,! ((~ &/,f?:4&,}{1!f'J) ~;tf ., G f''tj,,,,,,_,- /' .Phz_ l.lii f Se'i,\;,'.l'J -. •,,_y;,,c Zu.,,,, a~ r tdJ.ut-; f06~,:2tJt!4lV, 811T/H1.,;l./_li, <'1/fLFE-!z/l ·,:!:i;/;=:l: /; . \ C ~··, ., -, v1 ·.:, ~ vi st ··, ;, k)) .. 01 I V) l/l 0 rn ·.::=:: ··-::: ·-::: ···-·~--::. ··- ... "': ··-·- l"l'r .~.,I , ... , .:..-1 + II) 11:i .. ) l. .. •il i.n :1 .... t~~-. -~· _. Marvin Wel11t118'1•.-!'.'!...·~- 5115-33rd Ave West Everett, WA 98203-1367 ?'-':::.IC' ·J·"''., .. _J . , ,_ .. -~ .... -;--;.-.;;;....--,.:·-.-i,1·•¥.,~ ;/(1.\. i '..; ,·u i U.1 \.t 1..,;.c..'7~_,' -:";--;;-"'" ~ ........ -~--. ~· ' ' C 1: . ' ,, ',,. 2, J ./ ..... "· ,.\ _..,, Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 --,.. ·~·--"-· ·3~ct.:-:-.:.+ ·1 ·2. t ·3 il,l. ,1 .. t.ll 1111l,l11l,l .... il 111,111, J!I, i .. 1,1 .. 1,i,,,, I, I) L04P0002 Fleuve des Voiles PARTY OF RECORD REQUEST SLIPS · .. r:,1yrf~1~i11i~f~{,~!~~!~{~.,:::_:~~~b:~:·~~-· .·.· .• ... I . · l .... .,...,,;J, I. -... ~ .. IJ:\. RECYCLED PAPER. ~ MINIMUM 20% POST,CONSUMER FIBER CONTENT. «:Coil.fTlbian®-55 Clasp (6 x 9) ' ' ' ... ) Project :Location: The site is located on the north side of SE 192°d, west of 124th Ave NE. Pro;,ect Description: This is a request to subdivide approximately 6.8 acres, zoned R0 6, into 38 Jots for single family detached residences and tracts for drainage, sensitive areas, and recreation. The lots range from approximately 4,000 square feet to 6,000 square feet, Permits requested in this application: Formal subdivision Relevant environmental documents are available at the address below: Environmental checklist, Geotechnical report, Wetland study, Traffic study, Drainage study Development regulations to be used for project mitigation, known at this time: KCC 21A., including sensitive area regulations, road standards and 1998 Surface Water Design Manual Consistency with applicable County plans and regulations: This proposal will be reviewed for compliance with all applicable King County Codes, including those noted above Other permits not included in this application, known at this time: None at this time A public hearing before the King County Hearing Examiner is required for this application. Notification of the public hearing date will occur approximately 30 days prior to the scheduled hearing date. The Department of Development and Environmental Services (ODES) will issue a report and recommendation to the Hearing Examiner two (2) weeks prior to the scheduled public hearing. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Details of the appeal process will be included in the notice of recommendation. Any person wishing additional information on this proposed project should contact the Program Manager at the phone number listed above. Written comments may also be submitted to DOES. You may review the application and any environmental documents or studies in our Renton office. NOTE: If you require this material in braille, audio cassette, or large print, please call (206) 296-6600 (voice) or (206) 296-7217 (TTY). Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Mailing Date: December 28, 2004 ======-==--=----=--=----=----=--=-=-==-=-========= Please send me notification of the public hearing and other official notices concerning this application. File No. L04P0002 -Soos Creek Preliminary Plat ( Please print ) Name: ------- Address: ------ 6199000101/L04P0002 WEHRMAN MARVIN 5115 33RD AV W EVERITT WA 98203 CITY OF RENTON DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT MEMORANDUM Date: September 17, 2009 To: City Clerk's Office From: City Of Renton Subject: Land Use File Closeout Please complete the following information to facilitate project closeout and indexing by the City Clerk's Office. Project Name: Fleuve des Voiles Preliminary Plat LUA (file) Number: LUA-09-052 Cross-References: King Co. File #L04P0002, L06V0040, L08V0061 AKA's: Project Manager: Acceptance Date: October 1, 2004 Applicant: Charles Spaeth Owner: Contact: Taylor Engineering Consultants PID Number: 6199000240 ERC Decision Date: November 9, 2006 ERC Appeal Date: December 4, 2009 Administrative Denial: Appeal Period Ends: Public Hearing Date: December 12, 2006 Date Appealed to HEX: By Whom: HEX Decision: Approved with revised conditions Date: January 12, 2007 Date Appealed to Council: By Whom: Council Decision: Date: Mylar Recording Number: Project Description: Subdivision of approximately 6.8 acres into 39 lots for the development of single-family detached residences in the R-6 zone. Location: North side of SE 192nd St, west of 124'" Ave NE Comments: Denis Law Mayor May 4, 2009 Department of Community & Economic Development Charles Spaeth Ravenna Development LLC / Soos Creek Real Estate LLC 6839 Ravenna Avenue NE Seattle, WA 98115 SUBJECT: Wehrman Subdivision (Wehrman); King County File No. L04P0027 Fleuve des Voiles Subdivision (Fleuve): King County File No. L04P0002 Cogger Short Plat (Cogger): King County File No. L05S0040 Dear Mr. Spaeth: Effective April 1, 2009, Ordinance 5452 authorizes the Renton Planning Director the authority to approve an extension of up to two (2) years in addition to the normal period of validity for land use and subdivision approvals. This office has reviewed your March 31, 2009 request to extend the following permits for an additional two (2) years beyond any other extensions authorized by the Renton Municipal Code. You have requested extension of following three projects: Wehrman Subdivision; King County File No. L04P0027 Fleuve des Voiles Subdivision: King County File No. L04P0002 Cogger Short Plat: King County File No. L05S0040 Original Expiration Dates August 10, 2011 January 12, 2012 February 16, 2012 Your extension request is approved. The following subdivisions will be given a one year extension authorized by the Renton Municipal Code, plus an additional two years authorized by Ordinance 5452. These permits will expire on: Wehrman Subdivision; King County File No. L04P0027 Fleuve des Voiles Subdivision: King County File No. L04P0002 Cogger Short Plat: King County File No. L05S0040 Extended Expiration Dates August 10, 2014 January 12, 2015 February 16, 2015 It is the applicant's responsibility to self-monitor the revised expiration dates. Please do not rely on the City to alert you of an upcoming expiration date. Please feel free to contact Ion Arai at (425) 430-7270 should you have any further questions or comments regarding this extension. Sincerely, 1 / c. ~,\J Chip Vincent Planning Director \ cc: Jennifer Henning, Current Planning Manager City of Renton Files: LUA09-025 LUA09-052 LUA09-016 Renton City Hall • 1055 South Grady Way • Renton, Washington 98057 • rentonwa.gov MINUTES OF THE DECEMBER 12, 2006, PUBLIC HEARING ON DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES FILE NO. L04P0002. Peter T. Donahue was the Hearing Examiner in this matter. Participating in the hearing were Chad Tibbits, Bruce Whittaker and Kristen Langley representing the Department; and De-En Lang representing the Applicant. The following Exhibits were offered and entered into the record: "<l61i<hi9it }lo. 1;:,: E,d1ibit 1.o. 2.r E,ehibit J:io. 3 v· F-sbibit J>h. 1 .1 ~irnieit No. 5 v Exhibit )l8. 61 EXhlbfr"NO. J.1 l!Xhlbit 1 fo. B ,.; Enhihit 1> Je. 9" Bxltibh No. 1a/ l!1!Aibd No w' 1'nhibit }fo. ltzv· Exhibit Ne, 13/ M1iki'hit Jtlc. 11 j Department of Development and Environmental Services file no. L04P0002 Department of Development and Environmental Services Preliminary Report, dated December 12, 2006 Application for Land Use Permits received February 4, 2004 SEPA Environmental checklist received February 4, 2004 SEPA Determination of Non-significance issued November 9, 2006 Affidavit of Posting indicating a posting date of March 8, 2005; received by DDES on March 9, 2005 Preliminary plat map received June 30, 2006 (Revised) Revised Level 1 Downstream Analysis prepared by Taylor Engineering Consultants, received March 31, 2006 Certificate of Water Availability from the Soos Creek Water and Sewer District dated June 17, 2005 Certificate of Sewer Availability from Soos Creek Water and Sewer District, dated June 17, 2005 Conceptual Recreation Plan received March 31, 2006 Revised Conceptual Grading and Drainage Plan received March 31, 2006 Letter from Ben and Geri Bush faxed December 4, 2006 Letter from Sandy Haydock, Fire District 40, dated December 12, 2006 The following exhibit was entered into the record on January 13, 2007: &hibit MO. 15 J December 14, 2006 (received by e-mail December 13) DDES memorandum regarding landscaping inspection fees • . .. .. TYPES 3 and 4 LOG SHEET (Format Plat, Rezone, Special Use, Shoreline Redesignation) ; '--'FI"'L,,_E .cc.NU=M=B=E=R"'-: --~L=04~P"---0"-'0"--'0=2 7LL;t,f y£ aks~~~.2 ~$ TE(S) ~· 1 =~1-,_/-4/ 3,,._,_i~l i~IJ,_' __ _ E_PLbJA~T:il/P:'.]:R;&O!I]JEfilC:JT:JNi,A~M,!]E:;_;_:___JS~O~Os!S~C~lffl~,E~l~tj'f'tLtA~'f' CONTINUANCE HEARING DATE(S), ____ _ PLANNER: Kim Claussen PROPOSED ORDINANCE NO.: aoo(o -OSfr~.S ENGINEER: Bruce Whittaker RELATED APPLICATION & FILE NO. A03P0286 APPLICATION FILED (date): 02/04/04 COMPLETE APPLICATION (date): 10/1 &251 ' EXAMINER DECISION/REC: ________ _ APPEAL FILED: D NO D YES date: _____ _ A. COUNCIL ACTION: ________ ORDINANCE NO.: __ _ EFFECTIVE DATE: _____ _ HEARING DATE(S) ______________________________ _ I. D NOTICE OF APPEAL 2. D APPEAL ARGUMENTS ( B· '~----~ HEARING EXAMINER'S ACTIONS 1. D PREHEARJNG CONF. NOTICE date(s): . i. ' ,7 ji!I.._ HEARING NOTICE date(s): 111 i Lj ii I.£ 3 D PREHEARING ORDER date(s): 4 D CONTINUATION date(s): 5. KREPORT date(s): 1/1.2.,/07 r I 6 D RECONSIDERATION date(s): 7. D APPEAL SUMMARY date(s): C. ODES STAFF ACTIONS I. D CONTINUATION NOTICE date mailed: ---~-- ! I ,l:¥\ (o lp 2. [1_REPORT date mailed: 3. 6 .ADDENDUM REPORT date mailed: ______ / C4) ~TRANSMITTAL TO EXAMINER (POR's/DOCS/STUDIES) date sent: _ _,_/.,_J .,_/.,,.J._3,_ 1 ,_0,._ ~lR~--- 5. Ji!!. PROPOSED ORDINANCE NUMBER EMAIL TO THE KC CLERKS OFFICE date sent: / 1/-(0 )Q(o D. , SEPA REQUIREMENTS -. ,, I I I. THRESHOLD DETERMINATION: \,-.\\))'..JS . DATE ISSUED: -~l\_'~<.~l_'ic.;l~V~·-~(p~_ i I 2. J DATE 500' RADIUS/AGENCIES/PORS/STAFF SENT: ---'-'-'~! _,(j._·'....i...,.l.v-'¥------------ 3. APPEAL FILED: DYES D NO a. APPELLANTS: --------------date received: _______ _ date received: _______ _ date received: _______ _ b. APPEAL ARGUMENTS: __________ _ date received: _______ _ date received: _______ _ date received: _______ _ L04P0002 E. PUBLIC NOTICE REQUIREMENT . ' 2. , NOTICE OF RECOMMENDATION/PUBLIC HEARING 1 ) ! , j 0 a) ~EGAL AD SEA TILE TIMES date(s) sent: / ! //u/ \J le date published: /I ~ / S ,' ~ L; · ' LOCALS date(s) sent: I i · l..J O' · date 11ublished: I ) / I 6 ·' UV! b) . 500' RADIUS/AGENCIES/POR's/STAFF date sent: +I 'cc;),_,lc.,1 b-!-<)·-'-"")-P}-(,,_>r,n tn'\) 1S Ii \fi. ,.Jp // Scl J>o-..., {_y APPLICATION Date received: February 4, 2004 I. D INTAKE CHECKLIST 2. 3. D APPLICATION FEE ~PLICANT DESIGNATION FORM 4. D LEGAL DESCRIPTION 5. z;YASSESSOR'SMAPS: ,)C ?3-,;)3·5' /dE 61,226 /50 33-,;?J~S: &Ne.1-22.-.5 6. ~RTIFICATEOFWATERAVAILABILITY s;t-/&,,-.cJ¥ / 6-23 rsc:JS- 7. o{ERTIFICATE OF SEWER AVAILABILITY 'f"/~ .,,-,!fl f" t£',r 2..,3 -(;) 0 8. D PRELIMINARY HEAL TH APPROVAL 9. D CERTIFICATE OF FUTURE CONNECTION 10. ~~ DISTRICT RECEIPT 11. EJ" SITE PLAN/PLAT MAP i, \), 'l i ! (.; / U ~ 12. i3"LEGALLOTPROOF .5'c!/IE,LJ,/tL£/l /7;rc KE/l£!/2i- u. ~NS!TIVE AREA AFFIDAVIT 14. ~VIRONMENTAL CHECKLIST 15. Co/'rRANSPORTATION CONCURRENCY ~ Sf / . 16. ~VEL0NEDRAINAGEANALYS1S/A'i1Ll/bt:7-1 /J,REf· /,_/..~. £/-/&,-~ /rb-vij-db 17. ~THER P&!:,/r/D-1,.e:< . ,~'v' )1,-A/ ·Gv· _ttvi1icLC' ci'.l ( ':; Cc[..:i1 / <..Ji I 18. D WAIVER(S) ____________ _ Q ADD TIONAL PLANS/MAPS ' CONCEPTUAL DRAINAGE PLAN 2. WETLAND MITIGATION PLAN -:1. REVISION NO. I ~ REVISION NO. 2 v,,---'.REVISION NO. 3 -~ REVISION NO. 4 0 OTHERMAPS .....-a) 7a'/! t:/ DATES RECEIVED: I cP/JI/J~ M V. 3 3/ /u.,,. b), _________________ _ c), _________________ _ d), _________________ _ e), _________________ _ !) _________________ _ --.. L04P0002 QPECIAL STUDIES DATES RECEIVED .....-1-. WETLAND/STREAM REPORT ......-2. GEOTECHNICAL REPORT .....:,r. TRAFFIC STUDY 4. WILDLIFE STUDY -----s. OTHER(documenttitlef::..;\~-~~'22~~~~~'---.,/'J!@~P~ £,{?J/0J- ~ Qc_\l £ ~ /~ I •,j(D File No. L04 P0002 Fleuve des Voiles Additional Correspondence ( I. ) 36. ~-~ 41. 1:2/1'-lj a t,, & .dQ. /J. ~ kOAif;j 0t·,F k &~ 42. ~/1~/01 Fn.a:..P {)4Ylm f. ~ Jh ~ &i / -ID ~ docl..~ 43. l~/3/o& d'.icc rv I -bcJ1£1)u.,{_L~ fu ttdtw...'£.u4Ji I I tJ 44. ;:;i-f :2,/0? A-4 lo /le M.,_~ 0/. 'frO>i .;t{R D/$1-. l/0 45. ___________________________ _ 46. ___________________________ _ 47. ___________________________ _ 48. ___________________________ _ 49. ___________________________ _ 50. ___________________________ _ 51. ___________________________ _ 52. ______________________ . _____ _ 53. ___________________________ _ 54. ___________________________ _ 55. ___________________________ _ 56. ___________________________ _ 57. ___________________________ _ 58. ___________________________ _ 59. ___________________________ _ 60·--------------~------------- 61. ___________________________ _ 62. ___________________________ _ 63. ___________________________ _ ® TO: FAX NO.: PHONE NO.: King County Dept. of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98057-5212 Fax No. 206-296-6613 or 206-296-7051 FAX COVER SHEET Ginger/ Marka 206-296-1654 206-296-4660 Total numbers of pages including this cover sheet: ~ Date: 1,\ r?>\<)'-e From: Shirley Goll Senders Name Time: JD:30 e:,n. Phone: 206-296-6796 Sender's Phone Permit Name/Number: L04P0002 -Fueve Des Voiles Parties of Record list, applicant name & address, property location. COMMENTS: Hearing date is set for December 12, 2006. SEPA appeal period will end on December 4, 2006. PROPOSED ORDINANCE NUMBER· # 2006-D S\.J;, '::I ExaminerFaxCover.doc , iotice of Decision- Department of Development and Environmental Services Land Use Services Division SEPA Threshold Determination and Notice of Recommendation & Hearing 900 Oakesdale Avenue Southwest Renton, Washington 98055~1219 File No.: L04P0002 Project Name: Fleuve Des Voiles Subdivision (Formerly Soos Creek) ODES Project Manager: Chad Tibbits, 206-296-7194 Email: chad.tibbits@metrokc.gov Applicant: Project Location: Project Description: Permits Requested: Charles Spaeth 6839 Ravenna Avenue NE, Seattle, WA 98115 206-526-8481 The site is located on the north side of SE 192"d Street, west of 124th Avenue NE, approximately 19100-1241 " Avenue SE, Renton, WA. Subdivision of approximately 6.8 acres into 39 lots for the development of single family detached residences in the R-6 zone. The proposed lots range in size from approximately 4,000 to 12,000 square feet. Formal Subdivision Department Recommendation to the Hearing Examiner: Approve, subject to conditions Date of Public Hearing: December 12, 2006, 1:30 pm DOES Hearing Room -first floor 900 Oakesdale Ave SW Renton, WA 98055-1219 SEPA Threshold Determination: Determination of Mitigated Non-Significance (MONS) Issued November 9, 2006 The Department of Development and Environmental Services (ODES) will issue a written report and recommendation to the Hearing Examiner two weeks prior to the scheduled public hearing. Persons wishing to receive a copy of the report should contact ODES at the address listed below. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Appeal procedures will be stated in the Examiner's written decision. Any person wishing additional information on this proposed project should contact the Project Manager at the phone number listed above. Written comments may also be submitted to DOES. A public hearing as required by law will be held to consider the approval of this application. If the Renton School District announces a district-wide school closure due to adverse weather conditions or similar area emergency, the public hearing on this matter will be postponed. Interested parties will be notified of the time and date of the rescheduled hearing. Any questions regarding postponements and rescheduling can be directed to the Hearing Examiner's Office at (206) 296-4660. Comment/Appeal Procedure on SEPA Threshold Determination: Comments on this SEPA determination are welcome. This SEPA determination may also be appealed in writing to the King County Hearing Examiner. A notice of appeal must be filed with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006, and be accompanied with a filing fee of $250.00 payable to the King County Office of Finance. If a timely Notice of Appeal has been filed, the appellant shall also file a Statement of Appeal with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006. The Statement of Appeal shall identify the decision being appealed (including the file number) and the alleged errors in that decision. Further, the Statement of Appeal shall state: 1) specific reasons why the decision should be reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the relief sought. The scope of an appeal shall be based on matters or issues raised in the Statement of Appeal. Failure to timely file a Notice of Appeal, appeal fee or Statement of Appeal, deprives the Hearing Examiner of jurisdiction to consider the appeal. Appeals must be submitted to the Department of Development and Environmental Services (ODES) at the following address: DDES--Land Use Services Division Date Mailed: November 9. 2006 Attn: Permit Center e, ~~ 900 Oakesdale Avenue Soul e t Renton, Washington 98055 }1~ 1 '·' cOV'( \~;c'i' ~),. If you have any questions regarding the appeal procedures, please contact the Planner at the phone number listed above. If you require this material in braille, audio cassette, or large print, call (206) 296-6600 (voice) or (206) 296-7217 (TTY). GOLL, SHIRLEY C:l/RRENT PLANNING SECTION MS: OAK -DE-0100 DDES/LUSD SEATTLE KC HEAL TH DEPT. E DIST. ENVIRON HEAL TH 14350 SE EASTGATE WAY BELLEVUE WA 98007 SPAETH, CHARLES RAVENNA DEVELOPMENT LLC 6839 RAVENNA A VE NE SEATTLE, WA 98115 STEVENS, MARK 19225124THAVESE RENTON. WA 98058 TOWNSEND, STEVE LAND USE INSPECTIONS MS: OAK -DE-0100 DDES / LUSD WARREN, SEAN & LINDA 19125 121ST PLACE SE RENTON, WA 98058 WEHRMAN, MARVrN 5115 33RD AVE W. EVERETT, WA 98203 WEST, LARRY GEO REVIEW DDES/LUSD MS: OAK-DE-0100 WHEELER, TIM 12131 SE 188TH ST RENTON, WA 98058 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 WIIITING, KELLY KC DOT -ROAD SERVICES DIVISION MS: KSC -TR-023 I WHITT AKER, BRUCE SR. ENGrNEER DDES/LUSD MS: OAK-DE -0100 WILSON, MARK & JOYCE 19205124THAVESE RENTON, WA 98058 L04P0002 L04P0002 L04P0002 BOSTON DESIGN & DEVELOPMENT LLC RICK BOSTON 13425 ELK KATHLEEN DR SE RENTON, WA 98059 BROWN REBECCA 6839 RAVENNA A VE NE SEATTLE WA 98115 BUSH, BEN & GERI 19124 121ST PL SE RENTON WA 98058 ::LAUSSEN, KIM PROGRAM MANAGER DDESILUSD MS: OAK -DE -0100 COGGER 609 GRANT A VE S RENTON WA 98055 DINSMORE, USA CURRENT PLANNING SUPERVISOR MS: OAK -DE-OJ 00 DOES I LUSD ERVIN, SHAWN 18848120TH AVE SE RENTON, WA 98058 GILLEN, NICK WETLAND REVIEW DDES/LUSD MS: OAK -DE-0100 HALLADIN, STEVE 19118 121ST PLACE SE RENTON, WA 9805 8 L04P0002 lD4P0002 L04P0002 L04P0002 L04P0002 lD4P0002 L04P0002 L04P0002 L04P0002 HALVORSON, lVANA BARGHAUSEN CONSULTING ENGINEERS l821572NDAVES KENT WA 98032 HODGE, HAROLD D. 19210 121ST PL SE RENTON, WA 98058 HUMPHREY, TROY 31029TH STNE PUYALLUP WA 98372 JACQUES CONSUL TING NEALJACQUES, P.E. 2633 SW 163RD PLACE BURIEN, WA 98166 KC HEARING EXAMINERS OFFICE ATTN: MARKA OR GINGER L04P0002 FLEUVES DES VOILES MS: YES -CC-0404 LANG, DE-EN 10658 R[VJERA PL NE SEATTLE, WA 98125 LANGLEY, KRIS TRAFFIC REVIEW ENGINEER MS: OAK -DE-0100 DDESILUSD LOZIER HOMES CORP JENNIFER MCCALL l203-l l4TI-l AVENUE SE BELLEVUE, WA 98004 MUCKLESHOOT CULTURAL RESOURCES PROGRAM ATTN. LAURA MURPHY & TAMMY JAMES 39015 172ND ST SE AUBURN WA 98092 L04P0002 lD4P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 • ® King County Dept. of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Fax No. 206-296-6613 or 206-296-7051 FAX COVER SHEET TO: \._~G,__~':> ':::.\X-),~~ FAXNo., d.u\.Q -5d 6 -SC\'t,C\ PHONE NO.: Total numbers of pages including this cover sheet: ....3..... Date: ) ¢\ Q'::l \o"" Time: ______ _ From:;)" f\S_[L ' Phone:dc:1,o.cf\\o-lo79& Sender's Na e~('.y( (j-\~ \\D~~-S ~~~ender's Phone Permit Name/Number: L. ffi '£,)-:\>d COMMENTS: BOSTON DESIGN & DEVELOPMENT LLC RICK HOSTON 13425 ELK KATHLEEN DR SE RENTON, WA 98059 BROWN REBECCA 6839 RAVENNA AVE NE SEAITLE WA 98115 BUSI-I, BEN & GERI 19124121ST PL SE RENTON WA 98058 CLAUSSEN, KIM PROGRAM MANAGER DDESILUSD MS: OAK -DE -0100 COGGER 609 GRANT A VE S RENTON WA 98055 98055 DINSMORE, LISA CURRENT PLANNING SUPERVISOR MS: OAK -DE-0100 ODES I LUSD ERVIN, SHAWN 18848 120TH AVE SE RENTON, WA 98058 GILLEN. NICK WETLAND REVIEW DDESILUSD MS, OAK -DE-0100 HALLADIN, STEVE 19118 121ST Pl.ACE SE RENTON, WA 98058 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 HALVORSON, IVANA BARGHAUSEN CONSULTING ENGINEERS 18215 72ND AVES KENT WA 98032 98032 HODGE, HAROLD D. 19210 121ST PL SE RENTON, WA 98058 HUMPHREY, TROY 310 29TH ST NE PUYALLUP WA 98372 JACQUES CONSULTING NEALJACQUES, P.E. 2633 SW 163RD PLACE BURIEN, WA 98166 KC HEARING EXAMINERS OFFICE A1TN: MAR.KA OR GINGER L04P0002 FLEUVES DES VOILES MS: YES -CC-0404 LANG, DE-EN 10658 RIVIERA PL NE SEAITLE, WA 98125 LANGLEY, KRIS TRAFFIC REVIEW ENGINEER MS: OAK -DE-0100 DDESILUSD LOZIER HOMES CORP JENNIFER MCCALL 1203-114TH A VENUE SE BELLEVUE, WA 98004 98004 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 MUCKLESHOOT CULTURAL RESOURCES PROGRAM L04P0002 A TI'N. LAURA MURPHY & TAMMY JAMES 39015172NDSTSE AUBURN WA 98092 98092 ROGERS, CAROL CURRENT PLANNING SECTION MS: OAK -DE-0100 DDESILUSD SEAITLE KC HEALTH DEPT. E DIST. ENVIRON HEALTH 14350 SE EASTGATE WAY BELLEVUE WA 98007 SPAETH, CHARLES RA VENN A DEVELOPMENT LLC 6839 RAVENNA AVE NE SEATTLE, WA 98115 STEVENS. MARK 19225 124TH A VE SE RENTON, WA 98058 TOWNSEND, STEVE LAND USE INSPECTIONS MS: OAK -DE -0100 DDES I LUSD WARREN, SEAN & LINDA 19125 121ST PLACE SE RENTON, WA 98058 WEHRMAN, MARVIN 511533RDAVEW. EVERETT, WA 98203 WEST, LARRY GEO REVIEW DDES/LUSD MS: OAK -DE-0 !00 WHEELER, TIM 12131 SE 188TII ST. RENTON, WA 98058 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L041'0002 L04P0002 L04P0002 WHITING, KELLY KC DOT-ROAD SERVICES DIVISION MS: KSC -TR-0231 WHITTAKER, BRUCE SR. ENGINEER DDES/LUSD MS: OAK -DE -0 JOO WILSON, MARK & JOYCE 19205 124TH A VE SE RENTON, WA 98058 L04P0002 L04P0002 L04P0002 Goll, Shirley From: Tibbits, Chad Sent: Monday, December 04, 2006 9:59 AM To: Goll, Shirley Subject: FW: Fleuve des Voiles Staff Report Here ya go! Fax away1 From: Charles Spaeth [mailto:cshaffercorp@att.net] sent: Monday, December 04, 2006 9:39 AM To: Tibbits, Chad Cc: De-En Lang Subject: RE: Fleuve des Voiles Staff Report Chad, Page I of3 Thanks for your prompt attention to this matter. I would appreciate receiving a copy of the POR list who received the staff report. My fax is 206-526-5939. I am currently drafting an email to you regarding a few substantive items contained in the report. You will have it sometime today. Best regards, Charlie Spaeth -----Original Message----- From: Goll, Shirley[mailto:Shirley.Goll@METROKC.GOV] sent: Monday, December 04, 2006 9:19 AM To: Tibbits, Chad Cc: Claussen, Kimberly; cshaffercorp@att.net Subject: RE: Fleuve des Voiles Staff Report Importance: High From: Tibbits, Chad Sent: Monday, December 04, 2006 7:44 AM To: Goll, Shirley Subject: FW: Fleuve des Voiles Staff Report Hi Shirley, I checked my copy of the por list off of the people screen of our system and I do have all those listed as being mid copies of the staff report I do not know why they were not listed on Chad's report & I am afraid I did not have time to check his por list against the permits plus screen but all those listed were mailed copies. Mr. Spaeth I can send you a fax of the names and addresses if you would like? Please let me know and give me your fax number if you would like a copy. Thank you and sorry about the confusion. Could you please make sure that the people on the list below get copies of the staff report for L04P0002. Please also update our POR list so that it matches the one send out by the Hearings Examiner. Thank you. 12/04/2006 Page 3 of3 but were not sent the report. Your immediate attention to this matter is greatly appreciated. Please let me know what you learn and what action has been taken as a result of looking into this matter. Thanks very much. Best regards, Charles Spaeth 12/04/2006 Page 2 of3 Chad From: Claussen, Kimberly Sent: Monday, December 04, 2006 7:41 AM To: Tibbits, Chad Subject: RE: Fleuve des Voiles Staff Report yes From: Tibbits, Chad Sent: Monday, December 04, 2006 7:28 AM To: Claussen, Kimberly Subject: FW: Fleuve des Voiles Staff Report Good Morning, Since the list differs from what we attached to the report versus what the Hearing Examiner sent out, should I have Shirley send out reports to the people missing on the ddes par list? From: Charles Spaeth [mai1to_:_cshaffercorp@att.net] Sent: Friday, December 01, 2006 4:35 PM To: Tibbits, Chad Cc: De-En Lang Subject: Fleuve des Voiles Staff Report Chad, I am in receipt of the recently issued staff report. Page 14 of that report contains a list of the parties to whom it was transmitted. This list differs from the list issued by the hearing examiner on November 14th announcing that the hearing would be on December 12. Pa_g_e 2 of that hearing_ examiner's notice lists the fo]]Qwing 1_1_l!l1les that do not app_earon the staff reportJist. De-En Lang* Muckleshoot Cult. Res. Mark Stevens Tim Wheeler Seattle KC Health Dept. Sean & Linda Warren Mark & Joice Wilson Lozier Homes, Corp. Charles Spaeth * Marvin Wehrman* I happen to know that the names with stars next to them, even though they did not appear on the staff report list, did r~~e_ive the staff report. I do not know whether the non-starred names received the staff report. If the non-starred names did not receive it I request that it be mailed to them immediately. If you know that they were mailed the report, I request that the staff report list be amended to correct the record to show who, in fact, did receive the staff report. Next week I will be sending you a few comments having to do with the report's contents, but for now I just want to make sure no one has grounds to challenge the project because they were parties of record 12/04/2006 Goll, Shirley From: Sent: To: Subject: Blossey, Linda Monday, November 13, 2006 8:19 AM Goll, Shirley Preliminary Plat -L04P0002 -Flueves Des Voiles Hi Shirley. !just wanted to let you know that your cover memo refers to file no. L04P0009 on thi5i._one, inste~d ofL04P0002, as it is in the title of the ordinance. I'm going with L04P0002. ~ -Coe«.._4-e..(A \'f\ ~,\..Q And the number on this one is 2006-0565. I will process the other plat now, and get back to you with the proposed number on that one. Linda Blossey Clerk of the Council's Office 206-296-0328 1 ~ ', , \ (ch ' • - Goll, Shirley From: Sent: To: Subject: Attachments: Goll, Shirley Friday, November 10, 2006 12:38 PM Council, Clerk Request for proposed ordinance# L04P0002 Flueves des Voiles Agenda.doc; Flueves des Voiles Subdivision cover memo.doc; Flueves des Voiles Subdivision Ord.doc Please have the attached ordinance introduced. Your office does not need to do a legal ad. Call me if you have any questions and please let me know what the number will be. (insert the 3 files ) Shirley A. Goll, ASII 206.296-6796 Flueves des Voiles Flueves des Voiles Flueves des Voiles Agenda.doc... Subdivision... Subdivision ... 1 ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton WA 98057-5212 PRELIMINARY PLAT AGENDA HEARING EXAMINER FOR METROPOLITAN-KING COUNTY COUNCIL LAND USE SERVICES DIVISION, BLACKRIVER CORPORATE PARK KING COUNTY DDES HEARING ROOM 900 OAKESDALE AVE SW, RENTON WA December 12, 2006 · PUBLIC HEARING 1:30 p.m. or as soon thereafter as possible FILE NO. L04P0002 -FLUEVES DES VOILES SUBDIVISION PRELIMINARY PLAT REQUEST Owner: Charles Spaeth, Soos Creek Real Estate, LLC Address/Phone: 6839 Ravenna Ave. NE, Seattle, WA 98115 Phone: 206-526-8481 STR: SW 33-23-5 Location: Located on the north side of SE 192°d St., west of 1241h Ave NE, Postal City of Renton, WA 98058 Land Measurement: 6.8 acres Proposed Use: To subdivide 6.8 acres into 39 lots for the development of single family detached residences in the R-6 zone. Fire District: No. 0040 School District: #403 Renton ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton WA 98057-5212 DATE: TO: FM: RE: November 9, 2006 Anne Noris, Clerk of the Council King County Council Lisa Dinsmore, Planning Supervisor Land Use Services Division Introductory Ordinances for Preliminary Plats Attached are Introductory Ordinance(s) for the Hearing Examiner's agenda scheduled for public hearing, as follows: File No. L04P0002 -FLUEVES DES VOILES SUBDIVISION scheduled to be heard on December 12, 2006 at 1 :30 pm A copy of the hearing agenda for each item is also attached for your information. If you have any questions or need additional information, please contact me at 296-6796. Attachments .. title .. body AN ORDINANCE authorizing a subdivision on certain property located on the north side of SE 192nd, west of 1241 " Ave NE, Renton, at the request of Charles Spaeth, Soos Creek Real Estate, LLC, department of development and environmental services file no. L04P0002 ·' November 14, 2006 OFFICE OF THE HEARING EXAMINER KING COUNTY, WASHINGTON 400 Yesler Way, Room 404 Seattle, Washington 98104 Telephone (206) 296-4660 Facsimile (206) 296-1654 Email: hearex@metrokc.gov NOTICE OF HEARING SUBJECT: Department of Development and Environmental Services File No. L04P0002 Proposed Ordinance No. 2006-0565 FLEUVE DES VOILES Preliminary Plat Application Location: On the north side of SE 192nd Street, west of 124th Avenue Northeast, approximately 19100-124th Avenue Southeast, Renton Applicant: Charles Spaeth 6839 Ravenna Avenue Northeast Seattle, Washington 98115 Telephone: (206) 526-8481 King County: Department of Development and Environmental Services (ODES) represented by Chad Tibbits 900 Oakesdale A venue Southwest Renton, Washington 98055 Telephone: (206) 296-7194 Facsimile: (206) 296-7051 A public hearing has been scheduled on this proposal for 1 :30 p.m. on December 12, 2006, in the Department of Development and Environmental Services Hearing Room, 900 Oakesdale Avenue SW, Renton, Washington. Any primary party wishing to reschedule the hearing for a different time or location must make a request in writing to that effect and must obtain the written concurrence of all other primary parties, which shall be submitted to the Hearing Examiner's Office at the above address within 7 days of the date of this notice. Primary parties include the applicant, property owner, and responsible County agency. (Other persons likely to be directly and substantially affected by County action on this proposal may request "party" status by submitting an intervenor petition to the Hearing Examiner.) Agreement to reschedule this proceeding shall constitute waiver by the parties of procedural time limits for its occurrence. A pre-hearing conference may be requested by any primary party prior to November 28, 2006. Hearing Examiner Rule VIII, which is included with this notice, governs pre-hearing conferences. If you are a party to this proceeding and believe a pre-hearing conference should be held prior to the public hearing, submit your written request with specific reasons in support thereof to the King County Heari' Examiner. ~ f\\.E CO'P \ L04P0002 -Fleuve des Voiles Page 2 of3 To promote efficiency in the conduct of hearings and to eliminate surprise, pre-hearing exchange of information is encouraged by the Rules of Procedure. Any person is entitled to receive, at cost, copies of documents in the County file. Application may also be made to the Examiner to direct exchange of other significant information by any person or agency. Mediation of disputes is available pursuant to King County Code Section 20.24.330 and Rules of Mediation. Please contact the Office of the Hearing Examiner if you need a copy of the Rules of Procedure or Rules of Mediation, or obtain the Rules by visiting our web site at www.metrokc.gov/mkcc/hearingexaminer. ORDERED November 14, 2006. Peter T. Donahue King County Hearing Examiner TRANSMI1TED November 14, 2006, to the following parties and interested persons: Barghausen Cons. Eng. Rebecca Brown Ben & Geri Bush Attn: Ivana Halvorson. 6839 Ravenna Ave. NE 19124 -121st Pl. SE 18215 -72nd Ave. S. Seattle WA 98115 Renton WA 98058 Kent WA 98032 Cogger Shawn Ervin Steve Halladin 609 Grant Ave. S. 18848 -120th Ave. SE 19118 -121st Pl. SE Renton WA 98055 Renton WA 98058 Renton WA 98058 Harold Hodge Troy Humphrey Jacques Consulting 19210-121st Pl SE 310-29th St. NE Attn: Neal Jacques Renton WA 98058 Puyallup WA 98372 2633 SW 163rd Pl. Burien WA 98166 De-En Lang Boston Design & Dev., LLC Lozier Homes, Corp. Lang Assoc., Inc. Attn: Rick Boston Attn: Jennifer McCall I 0658 Riviera Pl. NE I 3425 E Lk Kathleen Dr. SE 1203 -I 14th Ave. SE Seattle WA 98125 Renton WA 98059 Bellevue WA 98004 Muckleshoot Cult. Res. Seattle KC Health Dept. Charles Spaeth Attn: L. Murphy & T. James E. Dist. Environ. Health Ravenna Devel., LLC 39015 -172nd St. SE 14350 SE Eastgate Way 6839 Ravenna Ave. NE Auburn WA 98092 Bellevue WA 98007 Seattle WA 98115 Mark Stevens Sean & Linda Warren Marvin Wehrman 19225 -124th Ave. SE 19125 -!21st Pl. SE 5115 -33rd Ave. W. Renton WA 98058 Renton WA 98058 Everett WA 98203 Tim Wheeler Mark & Joyce Wilson Kim Claussen 12131 SE 188th St. 19205 -124th Ave. SE DDES/LUSD Renton WA 98058 Renton WA 98058 MS OAK-DE-0100 , L04P0002 -Flcuve des Voiles Lisa Dinsmore DDES/LUSD MS OAK-DE-0100 Kristen Langley DDES/LUSD MS OAK-DE-0100 Larry West DDES/LUSD MS OAK-DE-0100 Nick Gillen DDES/LUSD MS OAK-DE-0100 Chad Tibbits DDES-LUSD MS OAK-DE-0100 Kelly Whiting KC DOT, Rd. Srvcs. Div. MS KSC-TR-0231 Page 3 of3 Shirley Goll DDES/LUSD MS OAK-DE-0100 Steve Townsend DDES/LUSD MS OAK-DE-0100 Bruce Whittaker DDES/LUSD MS OAK-DE-0100 NOTE: If the Renton School District announces a district-wide school closure due to adverse weather conditions or similar area emergency, the proceeding on this matter will be postponed. Parties of record will be notified of the time and date of the rescheduled proceeding. Any questions regarding postponements and rescheduling can be directed to the Hearing Examiner's Office at (206) 296-4660. Sign language and communication material in alternate formats can be arranged given sufficient notice at PTD:ms L04P0002 NOT Attachment 296-1000 (TDD number 296-1024). ........ ••••• •••• ••••• RULES OF PROCEDURE OF THE KING COUNTY HEARING EXAMINER Rule VIII. PRE-HEARING CONFERENCES A. Purpose and Initiation Pre-hearing conferences promote efficient case management by providing an informal process for early identification of issues and resolution of procedural matters in complex cases. Evidence generally will not be received at a pre-hearing conference, except when required in order for the examiner to rule on a motion. (Pre-marking and introduction of exhibits to which there is no objection may occur at the discretion of the examiner.) The examiner, on motion of any party or upon his/her own motion, may convene a pre-hearing conference to: 1. Identify, clarify, limit or simplify issues. 2. Hear and consider pre-hearing motions. 3. Schedule hearings, identify parties and witnesses, determine the order of and limits upon testimony, obtain stipulations as to facts and law, identify and admit exhibits, order discovery, and consider and act upon any other matter which may aid in the efficient disposition of the hearing. B. Requests for Conference A motion to convene a pre-hearing conference shall be made to the examiner as soon as the need for a conference is recognized by the moving party (at least 21 days prior to the scheduled hearing date), and shall state the reasons for the request, including any motions to be presented. For good cause stated in the motion, the examiner may consider a request that fails to meet the 21-day requirement. For hearings authorized under KCC 20.24.080, a motion by any party for a pre-hearing conference shall be granted if timely. However, unless consented to by all parties or otherwise ordered for good cause by the examiner, no pre-hearing conference on an appeal can be convened later than 45 days after receipt of the statement of appeal by the hearing examiner's office. C. Proceedings at Conference A party who has received timely notice of a pre-hearing conference shall identify at the conference any pre-hearing motions not previously made which he/she intends to make. Parties or interested persons may also file timely written pre-hearing motions for consideration at the pre-hearing conference. Failure to make or disclose a motion which was available to the party at the time of the conference may be grounds for its denial if subsequently made. D. Pre-hearing Order Following a pre-hearing conference, the examiner shall issue an order specifying all items determined at the conference. The order shall be binding upon all parties and interested persons who received timely notice of the conference. Revised March 31, 1995 ... .. .. • DIREG. ,_NS TO DOES HEARING RO-.;,i/1 900 OAKESDALE AVE SW, RENTON -------·----------------------~ SOUTHBOUND 1-5 EXIT 157 -Martin Luther King Way Tum RIGHT onto 68"' Ave. S. 68'' Ave. S. becomes MONSTER RD. SW Monster Rd. turns into OAKESDALE A VE SW DOES is on your left (building 900) NORTHBOUND 1-5 EXIT 154 to l -40 5/W A-5 18/Burien/Renton Stay right to 1-405/Renton/Bellevuc 1-405 EXIT I to WA-181/W. Valley Hwy. LEFT onto W. Valley Hwy/SR 181 RIGHT onto East Grady Way LEFT onto Oakesdale Ave. SW DOES is on your right (building 900) NORTHBOUND SR 167 Northbound under the [-405 overpass LEFT at SW 7"' St (2 00 light) LEFT onto Oakesdale Ave. SW DOES is on your left (building 900) SOUTHBOUND I-405 EXIT 2 to WA-167/Aubum/Rainier Ave. Follow to SR-167 (Valley Fwy.) north LEFT onto SW Grady Way RIGHT onto Oakesdale Ave. SW ODES is on your right (building 900) NORTHBOUND 1-405 EXIT I to Interurban Ave. S/West Valley Hwy LEFT at light at ramp bottom (north under [-405) RIGHT onto SW Grady Way LEFT onto Oakesdale Ave. SW DOES is on your right (building 900) SW 7'"' srREEf SW GRADY WAY' -E s G:\workJng\rvtisc\Hex\DDES directions.doc :, ~ w ~ w > < _, ., \;' 0 ~ • ~·: King County DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES LAND USE SERVICES DIVISION KING COUNTY, WASHINGTON PRELIMINARY REPORT TO THE HEARING EXAMINER December 12, 2006-PUBLIC HEARING AT 1:30 P.M. DDES Hearing Room 900 Oakesdale A venue Southwest Renton, WA 98055-1219 Phone: (206) 296-6600 PROPOSED PLAT OF FLEUVE DES VOILES FILE NO: L04P0002 PROPOSED ORDINANCE NO: 2006-0565 A. SUMMARY OF PROPOSED ACTION: This is a request for a subdivision of7.07 acres into 39 lots for detached single-family dwellings. The proposed density is 5.51 dwelling units per acre. The lot sizes range from approximately 4,000 to 7,200 square feet. See Attachment 1 for a copy of the proposed revised plat map. B. GENERAL INFORMATION: Applicant: Engineer: STR: Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 206-526-8481 Taylor Engineering Consultants 205 Front Street S. Issaquah, WA 98027 425-391-1415 SW-33-23-05 Location: The site is located on the north side of SE 192nd St., west of 124th Avenue NE. Zoning: Acreage: Number of Lots: R-6 7.07 acres 39 Density: Approximately 5.51 units per acre Lot Size: Approximately 4,000 to 7,200 square feet in size Proposed Use: Single Family Detached Dwellings Sewage Disposal: Soos Creek Water and Sewer District Water Supply: Soos Creek Water and Sewer District Fire District: King County Fire District No. 40 ,.~.:.1 1 ' "ltE ,':()pv School District: Renton School District No. 403 Complete Application Date: October 1, 2004 Associated Applications: Drainage Adjustment L05V0040 (Attachme.nt 2) ,2 Exh1b1t No.------- Item No. ~:'tPo~g Received 12 -IZ -o ta King County Hearing Examiner C. HISTORY/BACKGROUND: The Subdivision Technical Committee (SIC) of King County has conducted an on-site examination of the subject property. The SIC has discussed the proposed development with the applicant to clarify technical details of the application, and to determine the compatibility of this project with applicable King County plans, codes, and other official documents regulating this development. As a result of preliminary discussions, the applicant presented the Technical Committee with a revised plat on June 30, 2006. The primary modifications include: A boundary line adjustment to the south to eliminate unbuildable lots, the connection of SE 191'' Street to 122"d Avenue SE to the north on the adjacent Plat of Wehrman (File No. L04P0027) for neighborhood connectivity, major revisions to the recreation space provided throughout the plat and incorporating the recreation space tract to be provided by the proposed Cogger Short Plat (File No. L05S0040) located directly adjacent to the property to the south. The Cogger Short Plat File No. L05S0040 will also be sharing access with the Plat ofFleuve Des Voiles, SE 191 51 Street. The Plat ofF!euve Des Voiles was originally submitted as the Plat of Soos Creek and was renamed by the applicant during the review process. D. THRESHOLD DETERMINATION OF ENVIRONMENTAL SIGNIFICANCE: Pursuant to the State Environmental Policy Act (SEPA), RCW 43.21C, the responsible official of LUSD issued a mitigated threshold determination of non-significance (MDNS) for the proposed development on November 9, 2006. This determination was based on the review of the environmental checklist and other pertinent documents, resulting in the conclusion that the proposal would not cause probable significant adverse impacts on the environment provided the following measures are complied with: • The proposed plat of Fleuve des Voiles has as its sole access a new leg of the Southeast 192nd Street/ 1241h Avenue SE intersection. In addition, the applicant for the preliminary plat ofF!euve des Voiles has submitted an application for the Cogger Short Plat. The Cogger Short Plat can not be developed without the public and private infrastructure in the Fleuve des Voiles preliminary plat, since the Cogger plat has no viable access without the roadway system in L04P0002. The two applications share stormwater facilities, are dependent upon one another, and have the same Applicant. The Department considers, for purposes of SEPA, the two applications to be "a development" for purposes of mitigation. • The intersection of Southeast 192nd Street/1241h Avenue SE was proposed to be improved as a part ofa Capital Improvement Project: CIP 401004. This CIP would have included the construction of tum lanes on SE l 92"d Street -to address an identified High Accident Location (14.80.030B)-and signalization of the intersection. Part of the rationale for signalization was to relocate an existing mid- block traffic signal for school-age pedestrians attending the Kent School District's Meeker Middle School. Part of the justification of the improvements was to address deficient levels-of-service on the existing northbound ( currently, the only 'minor street' approach to the intersection) approach to the intersection. • The County Executive's proposed 2007 -2012 CIP budget eliminated funding for this capital project. Funding levels are "$0" within the six-year horizon for adequacy of infrastructure to support this development proposal. No funding is available at the horizon year of the development. The CIP was not funded with MPS fees collected by development in the area. • A calculated deficient level-of-service (14.80.030A) will exist at the horizon year of the development, as calculated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project -and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192nd Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips Page 2 of 14 File No. L04P0002 will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. I. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192nd Street/ 124'h Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 (attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left turn), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction i£'when the deferred/cancelled CIP is constructed. • If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. • Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. Agencies, affected Native American tribes and the public were offered the opportunity to comment on or appeal the determination for 21 days. Neither the MDNS nor the specific mitigation measures were appealed by any party, including the applicant, and they have been incorporated as part of the applicant's proposal. E. AGENCIES CONTACTED: 1. King County Department of Natural Resources and Parks: The comment from this division have been incorporated into this report. 2. King County Fire Protection Engineer: Fire protection engineering preliminary approval has been granted. 3. Renton School District# 403: The comments from this district have been incorporated into this report. 4. Soos Creek Water and Sewer District (Sewer): The comments from this district have been incorporated into this report. 5. Soos Creek Water and Sewer District (Water): The comments from this district have been incorporated into this report. 6. Washington State Department of Ecology: No response. 7. Washington State Department of Fish and Wildlife: No response. 8. Washington State Department of Natural Resources: No Response. 9. Washington State Department of Transportation: No response. 10. METRO: No response. Page 3 of 14 File No. L04P0002 F. NATURAL ENVIRONMENT: I. Topography: The property is irregular in shape. The site is comprised of several distinct topographical areas. The eastern portion of the site is relatively flat where the proposed access road, recreation tracts C & I and drainage facilities are located. The central portion of the property slopes upward to the west at an approximate slope of23%. The far western portion of the property is relatively flat. 2. Soils: AgB (Alderwood gravely, sandy loam, 0-6%) and AgD (Alderwood gravely, sandy loam, 15-30%) surfaces soils are found on this site per King County Soil Survey, 1973. a. AgB -Alderwood gravely, sandy loam; 0-6% slopes. Runoff is slow and the erosion hazard is slight. This soil type has a moderate limitation for low building foundations due to a seasonally high water table, and severe limitations for septic tank filter fields due to very slow permeability in the substratum. b. AgD-Alderwood gravely, sandy loam; 15-30% slopes. Runoff is medium and the erosion hazard is severe. This soil has a severe limitation for foundations due to slope, and a moderate slippage potential. It has severe limitations for septic tank filter fields due to very slow permeability in the substratum. Two geotechnical reports were prepared for this plat with the first being prepared by Geo Trends on March 20, 2004 submitted with the application. The second geotechnical report was prepared by Geological & Geotechnical Consulting on February 15, 2005 and submitted as a revised report. The subject site is underlain by a variety of sediment types that are all related to the most recent glacial advance in the Puget Sound lowland. The soils have varying permeability characteristics that result in zones of perched groundwater or interflow. Site topography is also variable with typical slopes on the order of23 percent and localized areas associated with previous grading of 40% or more. Based on the analysis in the Geotrends, Inc. geotechnical report dated March 20, 2004 and the Gary A. Flowers, PLLC Geologic and geotechnical engineering report dated February 14, 2005, it has been determined that all on site slopes that exceed 40 percent in grade are either less than 20 feet in height or were created through previous legal grading. Therefore they may be legally graded ( or regraded) under King County Code 21A.24.310 D. I and 2. Although not formally mapped for the preliminary plat, portions of the site also meet the definition of an erosion hazard area and will require compliance with King County Code 21A.24.220. Development of the site will likely require a combination of significant grading and retaining wall construction. 3. Wetland/streams: A wetland evaluation and delineation was prepared by H&S Consulting on May 26, 2004. A conceptual wetland mitigation plan was prepared by AC Roth Environmental Services on June 22, 2005. A conceptual buffer mitigation plan was prepared by AC Roth Environmental Services on March 28, 2006. A final mitigation plan will be required prior to engineering plan approval. The site lies within the Soos Creek subbasin of the Green River drainage basin. A Class I Wetland is located off-site within Soos Creek Park to the northeast of the property and the required JOO-foot buffer with 15-foot building setback from that buffer will impact the northeastern portion of the property as shown on the revised preliminary plat. 4. Vegetation: This site is moderately wooded with a second and third-growth mixture of coniferous and broad-leafed trees native to the Pacific Northwest. Second-story vegetation, and groundcover consists of Northwest native species including salal, sword fem, berry vines, and grasses. 5. Wildlife: Small birds and animals undoubtedly inhabit this site; however, their population and species are limited due to nearby development. Larger species may visit this site on occasion. No threatened or endangered species are known to exist on or near the property. Page 4 of 14 File No. L04P0002 G. H. I. 6. Mapped Sensitive Areas: The Sensitive Areas Map Folio indicates the central portion of the subject property is within Steep Slope Hazard Areas and Erosion Hazard Areas. NEIGHBORHOOD CHARACTERISTICS: The property is located in an urban area of King County. Surrounding properties are all single- family detached residences. Currently the site is developed with a single-family residence with detached outbuildings. All existing structures are to be removed. SUBDIVISION DESIGN FEATURES: I. Lot Pattern and Density: The proposed lot and street layout is in conformance with King County Code (KCC) 21A (Zoning). The plat's proposed density of 5.51 dwelling units per acre is in conformance with KCC 2 lA. 2. Internal Circulation: The site will be served by a sub-access street shown on the site plan with two cul-de-sacs appearing on the ends of 122"d Court SE and 123rd Place SE. 3. Roadway Section: The roads will be designed and constructed to the urban standards of the 1993 King County Road Standards. The applicant will be required to get King County Parks approval in order to improve off-site access to the property at the intersection of SE 192nd Street and 1241h Avenue SE. The applicant has proposed to transfer approximately 455 square feet of property to King County Parks in order to improve this intersection. 4. Drainage: The Flueve Des Voiles subdivision is located in the Upper Soos subbasin of the Soos Creek basin. The Fleuves des Voiles site is subject to the Level One flow control and Basic water quality requirements of the 1998 KCSWDM. An adjoining proposed short plat (Cogger short plat L05S0040) is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision, along the south edge. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040 The combined, irregularly-shaped sites slope moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192nd Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. A drainage adjustment (L06V0040) is approved for the Flueves des Voiles and the Cogger short plat sites. The adjustment allows the use of a shared storm water facility for both sites. The mixing of the two stormwater detention requirements (Level I and Conservation) can be accomplished with the KCRTS Stormwater design program. TRANSPORTATION PLANS: 1. Transportation Plans: The subject subdivision is not in conflict with Transportation, Non-motorized and Trails plan. Page 5 of 14 File No. L04P0002 2. Subdivision Access: The site will gain access from 124th Avenue SE and 122"" Avenue SE. 3. Traffic Generation: It is expected that approximately 390 vehicle trips per day will be generated with full development of the proposed subdivision. This calculation includes service vehicles (i.e., mail delivery, garbage pick-up, school bus) which may currently serve this neighborhood, as well as work trips, shopping, etc. 4. Adequacy of Arterial Roads: This proposal has been reviewed under the criteria in King County Code 14.70, Transportation Concurrency Management; 14.80, Intersection Standards; and King County Code 14.75; Mitigation Payment System. a. King County Code 14.70-Transportation Concurrency Management: The Transportation Certificates of Concurrency dated February 7, 2003, April 3, 2003 and May 14, 2003 indicates that transportation improvements or strategies will be in place at the time of development, or that a financial commitment is in place to complete the improvements or strategies within six (6) years, according to RCW 36.70A.070 (6). b. King County Code 14:80 -Intersection Standards: An inadequate Level-of- Service (LOS) has been identified. A calculated deficient level-of-service (14.80.030A) will exist at the horizon year of the development, as calculated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), I 00% of the trips from the Fleuve des Voiles project -and the associated Cog{er Short Plat (L05S0040) will use the access off of Southeast 192" Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192"d Street/ 124th Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 (attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left tum), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction i£1when the deferred/cancelled CIP is constructed. If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. c. King County Code 14.75 -Mitigation Payment System: King County Code 14.75, Mitigation Payment System (MPS), requires the payment of a traffic impact mitigation fee (MPS fee) and an administration fee for each single-family residential lot or unit created. MPS fees are determined Page 6 of 14 File No. L04P0002 J. by the zone in which the site is located. This site is in Zone 342 per the MPS/Quartersection list. MPS fees may be paid at the time of final plat recording, or deferred until building permits are issued. The amount of the fee will be determined by the applicable fee ordinance at the time the fee is collected. PUBLIC SERVICES: 1. Schools: This proposal has been reviewed under RCW 58.17 .110 and King County Code 21A.28 (School Adequacy). a. School Facilities: The subject subdivision will be served by Benson Hills Elementary School, Nelson Middle School and Lindbergh High School all located within the Renton School District No. 403. b. School Impact Fees: No ordinance requiring impact fees for this school district has been adopted. c. School Access: The District has indicated that the future students from this subdivision will be bussed to the middle and high schools with students walking to the elementary school. This plat will be connecting with the improvements provided by the Wehrman Plat File No. L04P0027 to the north. Roadway conditions in the area consist generally of22-foot wide paved roadways with open roadway drainage facilities and limited areas that have gravel shoulders. These open roadway ditches vary in depth and proximity to the roadway traveled. 2. Parks and Recreation Space: The nearest public park is Boulevard Lane Park, located at !27'h Pl. SE and SE 188 1h Pl., Kent, WA. K.C.C. 21A.14 requires subdivisions in the UR and R zone classifications to either provide on-site recreation space or pay a fee to the Parks Division for establishment and maintenance of neighborhood parks. At this time, the applicant is proposing to provide suitable recreation space, Tract A of the Cogger Short Plat File No. L05S0040 shall be a shared recreation space in addition to Tract C and Tract I. The Subdivision Technical Committee concurs with the applicant's proposal. 3. Fire Protection: The Certificate of Water Availability from Soos Creek Water and Sewer District indicates that water is presently available to the site in sufficient quantity to satisfy King County Fire Flow Standards. Prior to final recording of the plat, the water service facilities must be reviewed and approved per King County Fire Flow Standards. K. UTILITIES 1. Sewage Disposal: The applicant proposes to serve the subject subdivision by means of a public sewer system managed by Soos Creek Water and Sewer District. A Certificate of Sewer Availability, dated June 17, 2005, indicates this sewer district's capability to serve the proposed development. 2. Water Supply: The applicant proposes to serve the subject subdivision with a public water supply and distribution system managed by Soos Creek Water and Sewer District. A Certificate of Water Availability, dated April 6, 2004, indicates this district's capability to serve the proposed development. L. COMPREHENSIVE AND COMMUNITY PLAN: Page 7 of 14 File No. L04P0002 I. Comprehensive Plan: This plan is governed by the 2004 King County Comprehensive plan which designates this area as Urban. The proposed subdivision is not in conflict with the policies of the Comprehensive Plan. 2. Community Plans: The subject subdivision is located in the Soos Creek Community Plan. The subject subdivision is not in conflict with the goals, guidelines, and policies of the Soos Creek Community Plan. M. STATUTES/CODES: If approved with the recommended conditions in this report, the proposed development will comply with the requirements of the County and State Platting Codes and Statutes, and the lots in the proposed subdivision will comply with the minimum dimensional requirements of the zone district. N. CONCLUSIONS: The subject subdivision will comply with the goals and objectives of the King County Comprehensive Plan and will comply with the requirements of the Subdivision and Zoning Codes and other official land use controls of King County, based on the conditions for final plat approval. 0. RECOMMENDATIONS: It is recommended that the subject subdivision, submitted revised and received June 30, 2006, be granted preliminary approval subject to the following conditions of final approval: 1. Compliance with all platting provisions of Title 19A of the King County Code. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. 3. The plat shall comply with the base density and minimum density requirements of the R-6 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environment Services. Any/all plat boundary discrepancy shall be resolved to the satisfaction of DDES prior to the submittal of the final plat documents. As used in this condition, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187, as amended (1993 KCRS). 5. The applicant must obtain the approval of the King County Fire Protection Engineer for the adequacy of the fire hydrant, water main, and fire flow standards of Chapter 17.08 of the King County Code. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location oflots as shown on the preliminary approved plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in K.C.C. 9.04 and the Surface Water Design Manual (SWDM) must also be satisfied during engineering and final review. Page 8 of 14 File No. L04P0002 a. Drainage plans and analysis shall comply with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes, as established by DDES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts, footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings # _____ on file with DDES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. e. A drainage conveyance pipe is required to allow for offsite stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSWDM at engineering plan submittal. f. The I 00-year floodlplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. A drainage adjustment (L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 7. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: a. 124'h Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. b. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated. Additional R/W at the northeast comer of the proposed SE 192"d St/124'h Ave SE intersection shall be acquired prior to engineering plan approval. This additional R/W is required to construct the 124 th Ave SE improvements and is shown on a Proposed Land Transfer Diagram received June 30, 2006. c. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. d. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 8. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. Page 9 of 14 File No. L04P0002 9. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The applicant has the option to either: (1) pay the MPS fee at the final plat recording, or (2) pay the MPS fee at the time of building permit issuance. If the first option is chosen, the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of building permit application. 10. Off-site access to the subdivision shall be over a full-width, dedicated and improved road which has been accepted by King County for maintenance. If the proposed access road has not been accepted by King County at the time of recording, then said road shall be fully bonded by the applicant of this subdivision. 11. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in K.C.C. 21A.24. Permanent survey marking, and signs as specified in K.C.C. 21A.24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers ( e.g., with bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. 12. Preliminary plat review has identified the following specific requirements which apply to this project. All other applicable requirements from K.C.C. 21A.24 shall also be addressed by the applicant. Wetlands Class I wetland(s) shall have a minimum buffer of 100 feet, measured from the wetland edge. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A 15-foot building set back line (BSBL) is required from the edge of all Sensitive Area Tracts and shall be shown on all affected lots. Signage shall be installed along the Sensitive Area Tract boundaries for long term protection and to clearly mark the extent of the tract. Sensitive area tract boundaries shall be clearly marked with bright orange construction and silt fencing prior to construction or site clearing activities. The boundaries shall remain marked until construction is complete. Road crossings of wetlands and/or buffers maybe allowed per KC 21A.24.330. Construction techniques such as retaining walls maybe required to limit impacts. Allowed impacts shall require mitigation. A final mitigation plan shall be required during engineering review. Off site utility construction within wetlands, aquatic areas, or buffers may require additional permits. This will be reviewed and determined during engineering review. Wetland hydrology may not be altered either during or after development. A hydrology analysis may be required during engineering review to show how wetland hydrology will be maintained after the site is developed. The engineering plans shall be routed to Critical Areas Staff for review of compliance to the above conditions. Page 10 ofl4 File No. L04P0002 Alterations to Streams or Wetlands If alterations of streams and/or wetlands are approved in conformance with K.C.C. 21 A.24, then a detailed plan to mitigate for impacts from that alteration will be required to be reviewed and approved along with the plat engineering plans. A performance bond or other financial guarantee will be required at the time of plan approval to guarantee that the mitigation measures are installed according to the plan. Once the mitigation work is completed to a ODES Senior Ecologist's satisfaction, the performance bond may be replaced by a maintenance bond for the remainder of the five-year monitoring period to guarantee the success of the mitigation. The applicant shall be responsible for the installation, maintenance and monitoring of any approved mitigation. The mitigation plan must be installed prior to final inspection of the plat. Geo technical Clearing is not permitted on this site between October 1 and April I unless it is in compliance with King County Code 2 IA.220 (erosion hazard areas). If clearing is proposed during the October 1 through April I time period the applicant must delineate all on-site erosion hazard areas on the final engineering plans ( erosion hazard areas are defined in K.C.C. 21A.06.415). The delineation of such areas shall be approved by a DOES geologist, and the requirements found in K.C.C. 21A.24.220 concerning erosion hazard areas shall be met. The applicant's geotechnical engineer shall provide recommendations for the design and construction of the road, onsite grading and compaction, subsurface drainage, and all required retaining walls. The geotechnical recommendations shall be included in the T.I.R. and incorporated into the design with submittal of the engineering plans. The report must specifically address any setback requirements for future structures from any proposed retaining walls, and any setback requirements must be shown on the final engineering plans. Any required easements for maintenance of walls or subsurface drainage must also be provided on the final plans. Special geotechnical construction inspection of the road improvements, onsite grading and compaction, subsurface drainage, and any required retaining walls is required. Special construction inspection of the above construction elements is required to ensure compliance with the geotechnical report recommendations and to address unanticipated soil and groundwater conditions. Daily inspection reports shall be submitted to the assigned King County Land Use Inspector during the Construction phases of those improvements. A final construction report shall be submitted verifying compliance with the geotechnical recommendations and providing foundation design parameters for future residential construction. Notes requiring the above shall be shown on the engineering plans. Geotechnical special inspection of bearing soils for future home foundations is required. Notes to this effect shall be shown on the engineering plans and the final plat. 13. The following note shall be shown on the final engineering plan and recorded plat: RESTRICTIONS FOR SENSITIVE AREA TRACTS AND SENSITIVE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including control of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tract/sensitive area and buffer. Page 11 of14 File No. L04P0002 The vegetation within the tract/sensitive area and buffer may not be cut, pruned, covered by fill, removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency, unless otherwise provided by law. The common boundary between the tract/sensitive area and buffer and the area of development activity must be marked or otherwise flagged to the satisfaction of King County prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tract/sensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot building setback line, unless otherwise provided by law. 14. Suitable recreation space shall be provided consistent with the requirements of K.C.C. 21A.14.180 and K.C.C. 21A. 14.190 (i.e., sport court[s], children's play equipment, picnic table[s], benches, etc.). a. A detailed recreation space plan (i.e., location, area calculations, dimensions, landscape specs, equipment specs, etc.) shall be submitted for review and approval by DDES and King County Parks prior to or concurrent with the submittal of engineering plans. b. A performance bond for recreation space improvements shall be posted prior to recording of the plat. 15. A homeowners' association or other workable organization shall be established to the satisfaction of DDES which provides for the ownership and continued maintenance of the recreation space and sensitive area tract(s). 16. Street trees shall be provided as follows (per KCRS 5.03 and K.C.C. 21A.16.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards, unless King County Department of Transportation determines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way, they shall be located no more than 20 feet from the street right-of-way line. d. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the county has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. e. The species of trees shall be approved by DDES if located within the right- of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers, or that is not compatible with overhead utility lines. f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approval. Page 12 of 14 File No. L04P0002 Q. g. The applicant shall contact Metro Service Planning at (206) 684-1622 to determine if 1241h Avenue SE is on a bus route. If 124'h Avenue SE is a bus route, the street tree plan shall also be reviewed by Metro. h. The street trees must be installed and inspected, or a performance bond posted prior to recording of the plat. If a performance bond is posted, the street trees must be installed and inspected within one year ofrecording of the plat. At the time of inspection, if the trees are found to be installed per the approved plan, a maintenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after DDES has completed a second inspection and determined that the trees have been kept healthy and thriving. 17. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is subject to change based on the current county fees. 18. The following have been established by SEPA as necessary requirements to mitigate the adverse environmental impacts of this development. The applicants shall demonstrate compliance with these items prior to final approval. 19. To implement K.C.C. 21A.38.230 which applies to the site, a detailed tree retention plan shall be submitted with the engineering plans for the subject plat. The tree retention plan (and engineering plans) shall be consistent with the requirements of K.C.C. 21A.38.230. No clearing of the subject property is permitted until the final tree retention plan is approved by LUSD. Flagging and temporary fencing of trees to be retained shall be provided, consistent with K.C.C. 21A.38.230.B.4. The placement of impervious surfaces, fill material, excavation work, or the storage of construction materials is prohibited within the fenced areas around preserved trees, except for grading work permitted pursuant to K.C.C. 21A.38.230.B.4.d.(2). 20. A note shall be placed on the final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of the proposed lots, consistent with K.C.C. 21 A.38.230.B.6. (Note that the tree retention plan shall be included as part of the final engineering plans for the subject plat.) 21. Transfer of property for intersection improvements at SE l 92"d Street and 1241h Avenue SE shall require King County Parks approval prior to engineering plan approval. OTHER CONSIDERATIONS: 1. The subdivision shall conform to K.C.C. 16.82 relating to grading on private property. 2. Development of the subject property may require registration with the Washington State Department of Licensing, Real Estate Division. 3. Preliminary approval of this application does not limit the applicant's responsibility to obtain any required permit or license from the State or other regulatory body. This may include, but is not limited to the following: a. Forest Practice Permit from the Washington State Department ofNatural Resources. b. National Pollutant Discharge Elimination System (NPDES) Permit from WSDOE. c. Water Quality Modification Permit from WSDOE. d. Water Quality Certification (401) Permit from U.S. Army Corps of Engineers. Page 13 of 14 File No. L04P0002 R. TRANSMITTED TO PARTIES LISTED HEREAFTER: BOSTON DESIGN & DEVELOPMENT LLC RICK BOSTON 13425 E LK KATHLEEN DR SE RENTON, WA 98059 BROWN REBECCA 6839 RA VENN A A VE NE SEATTLE WA 98115 .. BUSH, BEN & GERI 19124121 5TPLSERENTON WA98058 ,COGGER 609 GRANT AVE S RENTON WA 98055 'ERVIN, SHAWN 18848 120TH A VEE RENTON, WA 98058 · HALLADIN, STEVE 9118 121 sr PLACE SE RENTON, WA 98058 ·-BALVORSON, IV ANA BARGHAUSEN CONSULTING ENGINEERS 18215 72ND AVES KENT WA 98032 . HODGE, HAROLD D. 19210121 5 T PL SE RENTON, WA98058 · HUMPHREY, TROY 31029THSTNEPUYALLUP WA98372 · JACQUES CONSULTING NEAL JACQUES, P.E. 2633 SW 163RD PLACE BURIEN, WA 98166 /CLAUSSEN, KIM PROGRAM MANAGER DDES/LUSD DINSMORE, LISA CURRENT PLANNING SUPERVISOR GILLEN, NICK WETLAND REVIEW DES/LUSD GOLL, SHIRLEY CURRENT PLANNING SECTION LANGLEY, KRIS TRAFFIC ENGINEER DDES/LUSD LOCKMILLER, ANNE PROPERTY SERVICES DNR TOWNSEND, STEVE LAND USE INSPECTIONS TIBBITS, CHAD PLANNER DDES/LUSD WEST, LARRY GEO REVIEW/LUSD WHITT AKER, BRUCE SENIOR ENGINEER DDES/LUSD KC HEARING EXAMINERS OFFICE ATTN: MARKA OR GINGER L04P0002 FLEUVES DES VOILES MS: YES -CC-0404 Page 14 of 14 File No. L04P0002 I ~. I ~ 17 tL •.m , r - r ~·.~'-_··~-~~, 11 __ _ • I_ ! ! ' ,--: 2 ~ : Bi -·------I '·"" 'r 1.-8 r•• I --";,;;,.-~ ',;;: ~ .r_ ~md"-' ::o7::k:.. .,_,,,w mm'lf(~ ~; I ;I I Eli P, a ~i·'' \it ~/f t?t11 HttAv't, Lhs ,J,·/es 1-0'/ pt:)(:;JC) =2- 'ATTACHMENT#~/-/ '@ King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 July 20, 2006 Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 Loma Taylor TEC, Inc. 205 Front Street South/P .0. Box 1787 Issaquah, WA 98027 RE: Fleuves des Voiles Subdivision 1998 KCSWDM Adjustment Request (File No. L06V0040) Dear Applicant and Engineer: The Land Use Services Division, Engineering Review Section, has completed review of the adjustment request for the Fleuves des Voiles subdivision. You are requesting approval for an adjustment from the 1998 King County Surface Water Design Manual (KCSWDM) Core Requirement No. I, Section 1.2.1, Discharge at the Natural Location and Core Requirement No. 3, Section 1.2.3, Flow Control. You are also requesting approval for an adjustment to utilize an off-site storm water facility and formalize its shared use through Special Requirement No. I, Section 1.3.1, Shared Facility Drainage Plans with the Shared Facility Plan Guidelines published in a memo dated September 15, 1999. Our review of the information and a site visit provides the following findings: I. The proposed Fleuves des Voiles subdivision is located at 12216 SE 192"d Street. The 39 lot, 6.74 acre, proposed Fleuves des Voiles subdivision is undergoing preliminary approval under Land Use Services Division (LUSD) file number L04P0002. The Feuves des Voiles subdivision will be dedicating a separate tract to King County for the combined shared facility. 2. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040. 3. The subdivision and short plat are both located in the Upper Soos subbasin of the Soos Creek basin. The upper and lower portions of the Fleuves des Voiles site are subject to the Level Two and Level One flow control, respectively, and Basic water quality requirements of the 1998 KCSWDM. The Cogger short plat is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. . ATTACHMENT d PA~E .. J ··--h.GE Pieuves des Voile", L06V0040 July 20, 2006 Page 2 of 4 4, The combined, irregularly-shaped site slopes moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. 5. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192"d Street right-of-way, As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. Nuisance flows to adjoining residential properties would be largely eliminated, 6. No decorative ponds or shallow wells have been identified that would be affected by the proposed diversion. 7, Because the Fleuves des Voiles site is split between Level One and Level Two flow control, the proposal is to also allow the Level One flow control requirement to prevail due to the location and release point of the proposed facilities. When viewing the Fleuves des Voiles project on its own, this issue is not an adjustment issue and has been allowed as proposed based on previously established interpretation and policy, However, the implied request to allow the Cogger short plat to also utilize the Level One flow control criteria given its vesting to the 2005 KCSWDM, is an adjustment issue. 8. The Conservation Flow control standard (Level Two and preforested conditions) defined in the 2005 KCSWDM has become the default flow control standard to protect the environment of and allow for the restoration of water quality or habitat functions essential to salmonids. Because the 1998 KCSWDM Level One flow control standard is not equivalent to this upgraded standard, the Cogger short plat will not be allowed to utilize the Level One flow control standard. Mixing the two flow control requirements together can be accomplished with the KCRTS methodology, 9. The proposal is to also officially acknowledge the accommodation of the Cogger short plat into the shared facility design of the off-site Fleuves des Voiles storrnwater facility, The same applicant controls both developments and has indicated that both developments and the shared facility will be constructed concurrently since the short plat is also dependent on the plat for its access and recreation space. 10, Blanket adjustment L05V0067, signed 11/3/05, allows the use ofStorrnFilter 360 cartridge filter catch basins for projects vested to eitlter the 1998 or 2005 KCSWDM, .P,TTACHME~,iT _ d __ 1 ____ _ P /"\C. c:::_ _2 ____ . PACE: Fleuvcs des Voiles1 Lv6V0040 · July 20, 2006 Page 3 of 4 The blanket adjustment defines the limits of use and design criteria to be utilized when using this type of facility. 11. The Level One Drainage Analysis identified no restrictions or problems associated with the proposed discharge locations. 12. A consolidation of facilities for the proposed subdivision will be more economical in long term maintenance. Based on these findings, we hereby approve this adjustment to 1) allow the diversion of runoff to two separate stormwater facilities near the north and south ends of the combined site, and 2) utilize the shared facility plan concept to allow combining the Cogger short plat into the northern storm water facility, but 3) deny the Cogger short plat from utilizing the Level One flow control standard due to lack of equivalency, with the following conditions: 1. The release rates for the detention facilities will be based on the entire tributary area being directed to the facilities. 2. The volume for the detention facilities will be based on all flows directed to the facilities at full development under current zoning. The allowed release rate will be reduced by any undetained flows that would bypass the proposed subdivision drainage facilities. The detention volume shall be sized using the Level One flow control standard in the 1998 KCSWDM for the Fleuves des Voiles plat and the Conservation flow control standard in the 2005 KCSWDM for the Cogger short plat. The design Technical Information Report shall state the factor of safety selected and the basis of that determination. 3. Water quality facilities must be sized based on the entire proposed subdivision draining to the facilities including any required frontage improvements. 4. All onsite or offsite drainage facilities must be located in a public right-of-way, recreation space tract with easement or storm drainage tract dedicated to King County. 5. The developer of the shared facility is responsible for any cost sharing agreements that may be set up as part of the implementation of the shared facility plan. 6. Engineering plans for the Cogger short plat shall note this approved facility plan. 7. Additional storm drainage requirements identified by SEPA or the plat hearing review will apply to this project. The applicant retains all rights and privileges afforded in Section 1.4. If you have any further questions regarding this KCSWDM adjustment or the design requirements, please contact Mark Bergam at (206) 296-7270. Fleuves des Voiles/L06V0040 July 20, 2006 Page 4 of 4 Sincerely, James Sanders, P.E. Development Engineer Engineering Review Section Land Use Services Division Jim Chan, P.E. Supervising Engineer Site Engineering and Planning Section Building Services Division cc: Curt Crawford, P.E., Managing Engineer, Stormwater Services Section, KCDNR Bruce Whittaker, Engineer III, Engineering Review Section, LUSD Chad Tibbits, Project/Program Manager II, Current Planning Section, LUSD Mark Bergam, P.E., Engineer III, Engineering Review Section, LUSD ATT/,CHMENT ____ ')__ - 4 ~ · .1 ......... . --------'""J/"· ,.-.. :· PAGE:. t· '1~c. king Coonty Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Surface Water Design Manual Requirements / Standards Adjustment* Request Project Name: fieu.vc. des Vo; /es Pia.J- AND Co e,r Sh.o.+ Pk+ DDES Project File No.: L.D '-/ 0002 L05$00', 0 , DOES Engineer/Planner Name: Phone: Project Address: 122.1 (,, ~e: 1qz..._J St. R /-141 Date: ,3, 2t Q{p Please be sure to Include all plans (T.I.R., If available), sketches, photos and maps that may assist in complete review and consideration of this adjustment request. Failure to provide all pertinent information may result In delayed processing or denial of your request. Please submit two complete copies of this request, application form and applicable fee to the DOES Intake Counter, at 900 Oakesdale Avenue Southwest. Renton, Washington 98055-1219. For additional information, phone Randall Parsons, P .E., at (206) 29S-.7207. RDIIP. TO SECTION 1. 4 I1II CHAPTJ:ll 1 OP i'lllli Sll!IPACJ: WATIIP. DIISIGTR llllNUAL POP. :IDJ17S'l'IIJIRTS DESCRIPTION OF ADJUSTMENT REQUEST: ~ Standard D Complex D Experimental D Blanket D Pre-application ""' LL h ,..1 ->c' e a,1T"'-c e lll APPLICABLE VERSION KCSWDM: D 1990 (11/95) • jl(1998 (9/98) )3'. ZQQS • (Note: the term "variance" replaced by 'adjustmenr) APPLICABLE SECTION(S) OF STANDARDS: /1 Lore [a-re JUSTIFICATION PER KCSWDM SECTION 1.4.2 A See attachments listed below. AUTHORIZATION SIGNATURES: DETERMINATION: CJ Approva! y. Conditional Approval (see below) CJ DNRIWLRD Approval Signed: -1-r-#--,..,_.-AL-- DOES Staff Recommendation Signed: Conditions of Approval: See attached Memo Dated: CJ Denial ., Engineering Rovtew Supervisor: DDES, Bldg. Sorv. Div., Site Engineering & Planning Supervisor: Signed: ATTACHMENT ~ ~@ ~ 0 w ~[Q) ~R182006 ~5 ··· .. 2-· F?AGE-·· -'":'~z:0=1<:C D D E S t-1-.., . .:;;·: • • • , , • ... Justification per KCSWDM Adjustment Request: Adjustment No.L06V0040 June 21, 2006 Following are 4 standard adjustments required for lhe proposed drainage detention system proposed for the Fleuve des Voiles Plat Application L04P0002 and Cogger Short Plat Application L05S0040. 1. Standard adjustment to 2005 Manual Core Requirement # l, Discharge at the Natural Location. The project proposes to discharge project runoff to the Soos Creek wetland slightly north (upstream) of the natural location. It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable because strict compliance with Core Requirement #I would result in discharge to the neighboring backyards creating an unacceptable situation for the adjacent property owners. 2. Standard adjustment to 2005 Manual Core Requirement # l, Discharge at the Natural Location. The project proposes to discharge runoff from 124t11 Avenue SE to the Soos Creek wetland at 192"d Street, slightly south (downstream) of the natural location. It is impossible to provide treatment of runoff and retain the existing sheet flow discharge condition along the entire east side of the roadway because the edge of the roadway is at the property line and the neighboring property owner (King County Parks Department) so far will not gl"dllt a drainage easement for discharge of this runoff. 3. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. The project proposes to use Level I detention criteria for the entire site. The project site contains both Level 2 and Level I detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level 1 detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. 4. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stormwater is a logical extension of this concept. Note on all adjustment requests: The Fleuve des Voiles Plat is vested under the 1998 KCSWDM and the Cogger Plat must comply with the 2005 KCSWDM The existing site runoff calculations used for sizing the detention system comply with the 2005 Manual requirements for Cogger and the 1998 Manual requirements for Fleuve des Voiles. This means that the Cogger Short Plat area was modeled as folly forested for the existing conditions. The pond itself complies with the requirements of 2005 KCSWDM -1L .. PAGE: .~,-c- J /r,t,P ,:;J" "' :.~:;,J (~ ! -; '1i, EXISTING SllE: FOREST: 303,801 (6. 97) · BUILDING: 1,364 (0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) TOTAL: 334,208 (7.67) N EB ,.,,,,,.<>\.>! ,•.,,r, <.'!<l 0 I 7)5 , SCALE: 1" \ \ \ \ LEU~ DES· VOILES\ \ \ \ 150 ' 150 fl OFFICE OF THE HEARING EXAMINER KING COUNTY, WASHINGTON 400 Yesler Way, Room 404 Seattle, Washington 98104 Telephone (206) 296-4660 Facsimile (206) 296-1654 Email: hearex@metrokc.gov January 12, 2007 REPORT AND DECISION SUBJECT: Department of Development and Environmental Services File No. L04P0002 Proposed Ordinance No. 2006-0565 Location: Applicant: FLEUVE DES VOILES Preliminary Plat Application On the north side of SE 192nd Street, west of I 24th Avenue Northeast, approximately 19100 -I 24th Avenue Southeast, Renton Charles Spaeth represented by De-En Lang Lang Associates, Inc. I 0658 Riviera Place Northeast Seattle, Washington 98125 Telephone: (206) 306-8880 Facsimile: (206) 362-6848 King County: Department of Development and Environmental Services (DDES) represented by Chad Tibbits 900 Oakesdale Avenue Southwest Renton, Washington 98055 Telephone: (206) 296-7194 Facsimile: (206) 296-7051 SUMMARY OF RECOMMENDATIONS/DECISION: Department's Preliminary Recommendation: Department's Final Reconnnendation: Examiner's Decision: EXAMINER PROCEEDINGS: Hearing opened: Hearing continued administratively: Hearing closed: Approve, with conditions Approve, with revised conditions Approve, with further revised conditions MAIN FILE COP, December 12, 2006 December 12, 2006 December 13, 2006 EXHIBIT # 6 -':i L04P0002 -Fleuve des Voiles Page 2 of 14 Participants at the public hearing and the exhibits offered and entered are listed in the attached minutes. A verbatim recording of the hearing is available in the office of the King Cotmty Hearing Examiner. FINDINGS, CONCLUSIONS & DECISION: Having reviewed the record in this matter, the Examiner now makes and enters the following: FINDINGS: I . General Information: Applicant: Engineer: STR: Location: Zoning: Acreage: Number of Lots: Density: Lot Size: Proposed Use: Sewage Disposal: Water Supply: Fire District: School District: Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 206-526-8481 Taylor Engineering Consultants 205 Front Street S. Issaquah, WA 98027 425-391-1415 SW 33-23-05 The site is located on the north side of SE 19200 St., west of 124th Avenue NE. R-6 7.07 acres 39 Approximately 5.51 units per acre Approximately 4,000 to 7,200 square feet in size Single Family Detached Dwellings Soos Creek Water and Sewer District Soos Creek Water and Sewer District King County Fire District No. 40 Renton School District No. 403 Application completeness date: October 1, 2004 Associated Applications: Drainage Adjustment L05V0040 2. Except as modified herein, the facts set forth in the DDES reports to the Examiner and the DDES and King County Department of Transportation (Kcoon testimony are found to be correct and are incorporated herein by reference. 3. The subject property is a 7 .07-acre, irregularly-shaped parcel located north of Southeast 192nd Street at the present northerly stub terminus of I 24th Avenue Southeast, just west of Soos Creek in the unincorporated Renton area. The terrain of the site consists of two benches connected by a short fairly steep slope downward to the east. The benches are relatively flat to gentle in grade; L04 P0002 -Fleuve des Voiles Page 3 of 14 the general grade of the site is from west to east down toward Soos Creek. The property is vegetated with a moderately dense wood of successive-growth mixed-species native overstory with typical Northwest understory and ground cover. The properties are located within the Upper Soos sub-basin of the Soos Creek basin. A Class 1 wetland, a defined sensitive area under the applicable version of Chapter 21A.24 KCC, is located just off site of the northeast portions of the property bordering Soos Creek. A single-family residence and outbuildings are located on the property (and will be removed upon development). The surrounding area is generally residentially developed at lower large-lot suburban densities, and a school to the east, but is undergoing infill to higher-density suburban development within the urban growth area. 4. Applicant Charles Spaeth proposes subdivision of the property into 39 lots for detached single- family dwellings, as well as separate tracts for drainage facilities, open space and recreation. The density would be approximately 5.5 dwelling units per acre, with lot sizes ranging from approximately 4,000 to 7,200 square feet in area. 5. The Applicant is simultaneously developing the adjacent proposed Cogger short subdivision (file L05S0040), an eight-lot, .93-acre short subdivision proposed for the property directly abutting to the south between the site and Southeast 192nd Street. Concurrent development will allow for the Cogger property to be developed without a separate access onto Southeast 192nd Street, an arterial road; it will use access via the subject subdivision. 6. Vehicular access to the proposed development and the Cogger short subdivision will be provided by improvement of the existing 124th Avenue Southeast right-of-way, which runs due north from Southeast 192nd Street to join the property on the south boundary of the northeasterly-most projection. From there, the road would curve northwest and then due west to form a looped road network that would have two cul-de-sacs branching from it to serve some of the development's own Jots and a third to extend south from the southernmost portion of the loop to provide access to the Cogger short subdivision lots. A stub road would also branch from the internal loop northerly to connect with 122nd Avenue Southeast within the proposed Wehrman subdivision to the north (L04P0027, which has recently been granted preliminary plat approval). The Wehrman subdivision provides a through route north up to Southeast 188th Street, which would provide connection westerly to I 20th Avenue Southeast. 7. Common recreation facilities are to be developed within Tract C of the subject property and Tract A within the Cogger short subdivision, to be shared by the residents of both developments.' Although this arrangement does not meet the absolute letter of the code provisions in KCC 21A.14.180, which require location onsite and centrality within each specific development, it will be permitted in this case' given a) the direct adjacency of the properties; b) simultaneous development; c) unified control over both developments; and d) their both proposed to be governed by a single homeowners' association. 1n addition, and as importantly, the fact that the tracts are in separate developments is not a practical or safety concern in the instant case, since the road crossing to gain access to them would be no more than would be 1 Part of the reason for the property configuration which results in the Cogger recreation Tract A (even though it is on the side of the street of the bulk of the subject development~ whereas all of the Cogger Jots are on the south side of Southeast J 91st Street) is that some boundary line adjusrments (BLA) have been performed or are proposed in order to optimize the lot layout for the subject development. 2 As it has been in a very few past cases of similar circumstances. L04P0002 -Fleuve des Voiles Page 4 of 14 typically provided in a single larger development with an internal road system. The road crossings to gain access to the intended recreation facilities are over subaccess, low-volume roads and the proposal provides the requisite safe convenience and accessibility which lay at the heart of the subdivision recreation facility requirements. 8. The development's resident public schoolchildren will be bused to their respective middle and high schools, and students at the elementary level will walk to their designated elementary school, which at present is located to the northwest on 120th Avenue Southeast, with the most direct walking route via the aforementioned preliminarily approved but yet-to-be-developed Wehrman subdivision abutting to the north. Conditions of preliminary plat approval must accordingly be imposed to assure that safe walking conditions are provided for public school children residing in the development with some contingency if the Wehrman development is not completed prior to final plat approval of the subject development. The Wehrman development was made subject to conditions requiring that appropriate provisions be assured for safe walking conditions for school pedestrians, and in effect, the subject development is dependent upon those improvements, or an effective alternative, for such assurance. 9. The traffic impacts of the proposed development will be mitigated under the requirements of County code with respect to Chapter 14.70 KCC (Transportation Concurrency Management) and Chapter I 4. 75 KCC (Mitigation Payment System). 1n order to comply with Chapter 14.80 KCC regarding intersection standards, the Mitigated Determination of Non-Significance (MDNS) has imposed a mitigation measure requiring the installation of a traffic signal at the project's 124th Avenue Southeast entry onto Southeast 192nd Street. I 0. The development's surface water drainage will be collected and conveyed to stormwater drainage facilities in proposed Tract B, which will lie upslope of the wetland buffer contained with Tract A. The property is subject to the 1998 King County Stormwater Water Design Manual (KCSWDM) and must meet the standards for Level I detention and Basic water quality standards (the Cogger short plat is subject to the more recent 2005 KCSWDM standards, but the interrelationship of the two standards is accomplishable with the proposed stormwater design program). A drainage adjustment (L06V0040) has been approved for the two developments to allow the use of a shared stormwater facility. 11. Neighboring residents submit comments expressing concern about the density and character of the development as being out of scale with the existing development in the area and a reduction in the existing residents' quality oflife. The density of development is fully permissible under the existing R-6 zoning, which has been in place for a number of years in implementation of the state Growth Management Act and the County's implementing Comprehensive Plan and zoning. The Examiner has no authority to disallow the proposed density of development, which the Examiner notes is approximately half a unit per acre less than the maximum achievable under the base density of the applied R-6 zone. Other concerns expressed have to do with drainage and potential flooding, which will be fully addressed for regulatory compliance by conformity of the development with the applicable stormwater detention and water quality maintenance standards. Lastly, concern is expressed regarding some debris such as used tires on the property and the need for cleanup. That will presumably be accomplished during plat preparation and construction, since materials such as those are disallowed in construction fill and grading for development. L04P0002 -Fleuve des Voiles Page 5 of 14 12. The Fire District No. 40 Fire Marshal expresses concern regarding the road widths of the proposed development and the need for fire equipment access. The King County Fire Marshal has recently instituted a more assertive program of fire suppression rules applied to development, wherein if road widths are provided as narrow as the 1993 King County Road Standards (KCRS) permit, then individual structures may be subject to individual frre sprinklering requirements at the residential building permit stage. The matter is therefore left to post-preliminary plat consideration by the Applicant in deliberating the relative viability of those alternatives, and any accommodations which may ensue from discussions with the appropriate fire officials. 13. Chapter 21A.38 KCC's special overlay requirement S0-220 (Significant Tree Overlay) applies to the property. The Significant Tree Overlay standards require the development to retain a percentage of the significant trees onsite. To implement KCC 21A.38.230, a detailed tree retention plan must be submitted with the engineering plans for the subdivision. CONCLUSIONS: 1. The proposed subdivision, as conditioned below, would conform to applicable land use controls. In particular, the proposed type of development and overall density are specifically permitted under the R-6 zone. 2. If approved subject to the conditions below, the proposed subdivision will make appropriate provisions for the topical items enumerated within RCW 58.17.110, and will serve the public health, safety and welfare, and the public use and interest. 3. The conditions for final plat approval set forth below are reasonable requirements and in the public interest. 4. The dedications ofland or easements within and adjacent to the proposed plat, as shown on the revised preliminary plat submitted on June 30, 2006, or as required for final plat approval, are reasonable and necessary as a direct result of the development of this proposed plat, and are proportionate to the impacts of the development. DECISION: The preliminary plat of the Fleuve des Voiles subdivision, as revised and received June 30, 2006, is approved subject to the following conditions of approval: I. Compliance with all platting provisions of Title 19A of the King County Code. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. 3. The plat shall comply with the base density and minimum density requirements of the R-6 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environment Services. L04P0002 -Fleuve des Voiles Page 6ofl4 Any/all plat boundary discrepancy shall be resolved to the satisfaction ofDDES prior to the submittal of the final plat documents. As used in this condition, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. · 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187, as amended (1993 KCRS). 5. The applicant shall obtain documentation by the King County Fire Protection Engineer certifying compliance with the fire flow standards of Chapter 17 .08 of the King County Code. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location of lots as shown on the approved preliminary plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in K.C.C. 9.04 and the King County Surface Water Design Manual (KCSWDM) must also be satisfied during engineering and final review. a. Drainage plans and analysis shall comply with the 1998 KCSWDM and applicable updates adopted by King County and must meet the standards for Level 1 detention and Basic water quality standards. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes, as established by DDES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts, footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings # on file with ODES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. e. A drainage conveyance pipe is required to allow for off site stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSWDM at engineering plan submittal. f. The I 00-year floodplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. L04P0002 -Fleuve des Voiles Page 7 of 14 g. A drainage adjustment (L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 7. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: a. 124th Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. b. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated for the obtainment of additional R/W at the northeast comer of the proposed SE 192"" St/124"' Ave SE intersection, required to construct the 124"' Ave SE improvements. The necessary R/W, which is shown on a Proposed Land Transfer Diagram received June 30, 2006, shall be acquired prior to engineering plan approval. c. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. d. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 8. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. 9. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as detennined by the applicable fee ordinance. The applicant has the option to either: (1) pay the MPS fee at the final plat recording, or (2) pay the MPS fee at the time of building permit issuance. If the first option is chosen, the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads," All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of building pennit application. 10. Off-site access to the subdivision shall be over a full-width improved road which has been accepted by King County for maintenance. If a proposed access road meeting those standards has not been accepted by King County at the time of recording, then said road shall be fully bonded by the applicant of this subdivision. 11. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in the applicable version of Chapter 21A.24 KCC (the pre-2005 version). Permanent survey markings and signs as specified in K.C.C. 21A.24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers ( e.g., with bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. L04P0002 -Fleuve des Voiles Page 8 of 14 12. Preliminary plat review has identified the following specific requirements which apply to this project. All other applicable requirements from K.C.C. 21A.24 shall also be addressed by the applicant. Wetlands Class I wetland(s) shall have a minimum buffer of 100 feet, measured from the wetland edge. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A 15-foot building set back line (BSBL) is required from the edge of all Sensitive Area Tracts and shall be shown on all affected lots. Signage shall be installed along the Sensitive Area Tract boundaries for Jong term protection and to clearly mark the extent of the tract. Sensitive area tract boundaries shall be clearly marked with bright orange construction and silt fencing prior to construction or site clearing activities. The boundaries shall remain marked until construction is complete. Road crossings of wetlands and/or buffers maybe allowed per KC 21A.24.330. Construction techniques such as retaining walls maybe required to limit impacts. Allowed impacts shall require mitigation. A final mitigation plan shall be required during engineering review. Off site utility construction within wetlands, aquatic areas, or buffers may require additional permits. This will be reviewed and determined during engineering review. Wetland hydrology may not be altered either during or after development. A hydrology analysis may be required during engineering review to show how wetland hydrology will be maintained after the site is developed. The engineering plans shall be routed to Critical Areas Staff for review of compliance to the above conditions. Alterations to Streams or Wetlands If alterations of streams and/or wetlands are approved in conformance with K.C.C. 2 IA.24, then a detailed plan to mitigate for impacts from that alteration will be required to be reviewed and approved along with the plat engineering plans. A performance bond or other financial guarantee will be required at the time of plan approval to guarantee that the mitigation measures are installed according to the plan. Once the mitigation work is completed to a DDES Senior Ecologist's satisfaction, the performance bond may be replaced by a maintenance bond for the remainder of the five-year monitoring period to guarantee the success of the mitigation. The applicant shall be responsible for the installation, maintenance and monitoring of any approved mitigation. The mitigation plan must be installed prior to final inspection of the plat. L04P0002 -Fleuve des Voiles Geotecbnical Page 9 of 14 Clearing is not permitted on this site between October I and April I unless it is in compliance with King County Code 21 A.220 ( erosion hazard areas). If clearing is proposed during the October I through April I time period the applicant must delineate all on-site erosion hazard areas on the final engineering plans (erosion hazard areas are defined in K.C.C. 21A.06.415). The delineation of such areas shall be approved by a ODES geologist, and the requirements found in K.C.C. ZIA.24.220 concerning erosion hazard areas shall be met. The applicant's geotechnical engineer shall provide recommendations for the design and construction of the road, onsite grading and compaction, subsurface drainage, and al] required retaining walls. The geotechnical recommendations shall be included in the T.I.R. and incorporated into the design with submittal of the engineering plans. The report must specifically address any setback requirements for future structures from any proposed retaining walls, and any setback requirements must be shown on the final engineering plans. Any required easements for maintenance of walls or subsurface drainage must also be provided on the final plans. Special geotechnical construction inspection of the road improvements, onsite grading and compaction, subsurface drainage, and any required retaining walls is required. Special construction inspection of the above construction elements is required to ensure compliance with the geotechnical report recommendations and to address unanticipated soil and groundwater conditions. Daily inspection reports shall be submitted to the assigned King County Land Use Inspector during the Construction phases of those improvements. A final construction report shall be submitted verifying compliance with the geotechnical recommendations and providing foundation design parameters for future residential construction. Notes requiring the above shall be shown on the engineering plans. Geotechnica] special inspection of bearing soils for future home foundations is required. Notes to this effect shall be shown on the engineering plans and the final plat. 13. The following note shall be shown on the final engineering plan and recorded plat: RESTRICT10NS FOR SENSITIVE AREA TRACTS AND SENSITIVE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including control of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tract/sensitive area and buffer. The vegetation within the tract/sensitive area and buffer may not be cut, pruned, covered by fill, removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency, unless otherwise provided by law. L04P0002 -Fleuve des Voiles Page 10 of 14 The common boundary between the tract/sensitive area and buffer and the area of development activity must be marked or otherwise flagged to the satisfaction of King Collllty prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tract/sensitive area and buffer. The required marking or flagging shall remain in place 1B1til all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot building setback line, llllless otherwise provided by law. 14. Suitable recreation space shall be provided consistent with the requirements ofK.C.C. 21A.14.!80 and K.C.C. 21A. 14.190 (i.e., sport court[s], children's play equipment, picnic table[s], benches, etc.). a. A detailed recreation space plan (i.e., location, area calculations, dimensions, landscape specs, equipment specs, etc.) shall be submitted for review and approval by ODES and King County Parks prior to or concurrent with the submittal of engineering plans. b. A performance bond for recreation space improvements shall be posted prior to recording of the plat. c. The development's recreation space may be provided commonly with the adjacent Cogger short subdivision (L05S0040) as proposed and as discussed above, provided that the applicant demonstrates that a single homeowners association (see Condition 15 below) will be established for both developments and covenants provide for mutual and common use permission. In the event that the Cogger short subdivision is not platted in near concurrency and/or the Jots in the subject development are not established in a homeowners association common with those of the Cogger short subdivision prior to or at the time of final plat approval, the subject subdivision shall provide onsite recreation facilities in full conformity with KCC 21A.14.180. 15. A homeowners' association or other workable organization shall be established to the satisfaction ofDDES which provides for the ownership and continued maintenance of the recreation space and sensitive area tract(s). 16. Street trees shall be provided as follows (per KCRS 5.03 and K.C.C. 21A. J 6.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King Co1B1ty Road Standards, llllless King Collllty Department of Transportation detemrines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way, they shall be located no more than 20 feet from the street right-of-way line. L04P0002 -Fleuve des Voiles Page 11 of 14 d. e. f. g. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the county has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. The species of trees shall be approved by DOES iflocated within the right-of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers, or that is not compatible with overhead utility lines. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DOES prior to engineering plan approval. The applicant shall contact Metro Service Planning at (206) 684-1622 to determine if I 24th Avenue SE is on a bus route. If I 24th Avenue SE is a bus route, the street tree plan shall also be reviewed by Metro. h. The street trees must be installed and inspected, or a performance bond posted prior to recording of the plat. If a performance bond is posted, the street trees must be installed and inspected within one year of recording of the plat. At the time of inspection, if the trees are found to be installed per the approved plan, a maintenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after DOES has completed a second inspection and determined that the trees have been kept healthy and thriving. 17. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is subject to change based on the current county fees. 18. The following have been established by the MONS under SEPA authority as necessary requirements to mitigate the adverse environmental impacts of this development. The applicant/developer shall demonstrate compliance with these items prior to final plat approval. A calculated deficient level-of-service (KCC 14.80.030A) will exist at the horizon year of the development, as calculated by the Applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DOES File #L04P0028), I 00% of the trips from the Fleuve des Voiles project and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192"" Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and jointly with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. In order to mitigate the significant adverse impact (14.80.030A and 14.80.0308) that the proposed development will have at the intersection of Southeast 192"" Street/124th Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006. This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of L04P0002 -Fleuve des Voiles Page 12 of 14 Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left tum), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. 19. To implement former K.C.C. 21A.38.230 which applies to the site, a detailed tree retention plan shall be submitted with the engineering plans for the subject plat. The tree retention plan (and engineering plans) shall be consistent with the requirements of former K.C.C. 21A.38.230. No clearing of the subject property is permitted until the final tree retention plan is approved by LUSD. Flagging and temporary fencing of trees to be retained shall be provided, consistent with former K.C.C. 2 JA.38.230.B.4. The placement of impervious surfaces, fill material, excavation work, or the storage of construction materials is prohibited within the fenced areas around preserved trees, except for grading work permitted pursuant to former K.C.C. 21A.38.230.B.4.d.(2). 20. A note shall be placed on the final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of the proposed lots, consistent with K.C.C. 21A.38.230.B.6. 21. If the adjacent Wehrman subdivision development (L04P0027) is not completed prior to final plat approval of the subject development, certification shall be provided by the King County Department of Transportation that safe walking conditions are provided for public elementary schoolchildren residing in the subject development, along a reasonably direct and lawful route to their elementary school or, in the alternative, that they are provided with school bus service to the school and safe walking conditions are provided to the pertinent school bus stop. ORDERED January 12, 2007. ~----------Peter T. Donahue King County Hearing Examiner TRANSMITTED January 12, 2007, to the following parties and interested persons ofrecord: Barghausen Cons. Eng. Attn: Ivana Halvorson. 18215 -72nd Ave. S. Kent WA 98032 Dennis Brevik 19103 -121st Pl. SE Renton WA 98058 Rebecca Brown 6839 Ravenna Ave. NE Seattle WA 98115 L04P0002 -Fleuve des Voiles Ben & Geri Bush 19124-12lstPI. SE Renton WA 98058 Steve Halladin 19118 -121st PL SE Renton WA 98058 Jacques Consulting Attn: Neal Jacques 2633 SW 163rd Pl. Burien WA 98166 Muckleshoot Cult. Res. Attn: L. Murphy & T. James 39015 -172nd St. SE Auburn WA 98092 Mark Stevens 19225-!24th Ave. SE Renton WA 98058 Tim Wheeler 12131 SE 188th St. Renton WA 98058 Lisa Dinsmore DDES/LUSD MS OAK-DE-0100 Kristen Langley DDES/LUSD MS OAK-DE-0100 Larry West DDES/LUSD MS OAK-DE-0100 Cogger 609 Grant Ave. S. Renton WA 98055 Harold Hodge 19210-121st Pl SE Renton WA 98058 De-En Lang Lang Assoc., Inc. 10658 Riviera Pl. NE Seattle WA 98125 Seattle KC Health Dept. E. Dist. Environ. Health 14350 SE Eastgate Way Bellevue WA 98007 Sean & Linda Warren 19125 -121st Pl. SE Renton WA 98058 Mark & Joyce Wilson 19205 -124th Ave. SE Renton WA 98058 Nick Gillen DDES/LUSD MS OAK-DE-0100 Chad Tibbits DDES-LUSD MS OAK-DE-0100 Kelly Whiting KC DOT, Rd. Srvcs. Div. MS KSC-TR-0231 NOTICE OF RIGHT TO APPEAL Page 13 of 14 Shawn Ervin 18848 -120th Ave. SE Renton WA 98058 Troy Humphrey 310-29th St. NE Puyallup WA 98372 Lozier Homes, Corp. Attn: Jennifer McCall 1203 -I 14th Ave. SE Bellevue WA 98004 Charles Spaeth Ravenna Devel., LLC 6839 Ravenna Ave. NE Seattle WA 98115 Marvin Wehrman 5115 -33rd Ave. W. Everett WA 98203 Kim Claussen DDES/LUSD MS OAK-DE-0100 Shirley Goll DDES/LUSD MS OAK-DE-0100 Steve Townsend DDES/LUSD MS OAK-DE-0100 Bruce Whittaker DDES/LUSD MS OAK-DE-0100 In order to appeal the decision of the Examiner, written notice of appeal must be filed with the Clerk of the King County Council with a fee of $250.00 (check payable to King County Office of Finance) on or before January 26, 2007. If a notice of appeal is filed, the original and six (6) copies of a written appeal statement specifying the basis for the appeal and argument in support of the appeal must be filed with the Clerk of the King County Council on or before February 2, 2007. Appeal statements may refer only to facts contained in the hearing record; new facts may not be presented on appeal. Filing requires actual delivery to the Office of the Clerk of the Council, Room 1025, King County Courthouse, 516 3"' Avenue, Seattle, Washington 98104, prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if actual receipt by the Clerk does not occur within the L04P0002 -Fleuve des Voiles Page 14 of 14 applicable time period. The Examiner does not have authority to extend the time period unless the Office of the Clerk is not open on the specified closing date, in which event delivery prior to the close of business on the next business day is sufficient to meet the filing requirement. Ifa written notice of appeal and filing fee are not filed within fourteen (14) calendar days of the date of this report, or ifa written appeal statement and argument are not filed within twenty-one (21) calendar days of the date of this report, the decision of the hearing examiner contained herein shall be the final decision of King County without the need for further action by the Council. MINUTES OF TIIE DECEMBER 12, 2006, PUBLIC HEARING ON DEP AR1MENT OF DEVELOPMENT AND ENVIRONMENT AL SERVICES FILE NO. L04P0002. Peter T. Donahue was the Hearing Examiner in this matter. Participating in the hearing were Chad Tibbits, Bruce Whittaker and Kristen Langley representing the Department; and De-En Lang representing the Applicant. The following Exhibits were offered and entered into the record: Exhibit No. I Exhibit No. 2 Exhibit No. 3 Exhibit No. 4 Exhibit No. 5 Exhibit No. 6 Exhibit No. 7 Exhibit No. 8 Exhibit No. 9 Exhibit No. I 0 Exhibit No. 11 Exhibit No. 12 Exhibit No. 13 Exhibit No. 14 Department of Development and Environmental Services file no. L04P0002 Department of Development and Environmental Services Preliminary Report, dated December 12, 2006 Application for Land Use Permits received February 4, 2004 SEPA Environmental checklist received February 4, 2004 SEPA Determination ofNon-significance issued November 9, 2006 Affidavit of Posting indicating a posting date of March 8, 2005; received by ODES on March 9, 2005 Preliminary plat map received June 30, 2006 (Revised) Revised Level I Downstream Analysis prepared by Taylor Engineering Consultants, received March 31, 2006 Certificate of Water Availability from the Soos Creek Water and Sewer District dated June 17, 2005 Certificate of Sewer Availability from Soos Creek Water and Sewer District, dated June 17,2005 Conceptual Recreation Plan received March 31, 2006 Revised Conceptual Grading and Drainage Plan received March 31, 2006 Letter from Ben and Geri Bush faxed December 4, 2006 Letter from Sandy Haydock, Fire District 40, dated December 12, 2006 The following exhibit was entered into the record on December 13, 2006: Exhibit No. 15 December 14, 2006 (received by e-mail December 13) DDES memorandum regarding landscaping inspection fees PTD:ms L04P0002 RPT King County Department of Development and Environmental Services State Environmental Policy Act (SEP A) Mitigated Determination Of Non-Significance for L04P0002-Fleuve Des Voiles(formerly Soos Creek) Date of Issuance: November 9, 2006 Project: Location: King County Permits: SEP A Contact: Proponent: Zoning: Community Plan: Drainage Subbasin: Sectionffownship/Range: Notes: Subdivision of 6.8 acres into 39 lots for the development of single- family detached residences in the R-6 zone. The proposed lots are approximately 4,000 to 12,000 square feet in size. The site is located on the north side of SE 192nd Street, west of 1241 h Avenue NE. Formal subdivision Chad Tibbits, Planner (206) 296-7194 or email at chad.tibbits@metrokc.gov Charles Spaeth 6839 Ravenna Avenue NE, ,Seattle, WA 98115 (206) 526-8481 R-6 Soos Creek Soos Creek SW-33-23-05 A. This finding is based on review of the project site plan revised and received dated June 30, 2006, environmental checklist dated February 4, 2004, Level 1 Downstream Drainage Analysis received March 31, 2006 (revised), Conceptual Buffer Mitigation Plan received March 31, 2006, Conceptual Grading and Drainage Plan (revised) dated March 31, 2006, Traffic and Intersection Report received February 4, 2004, Conceptual Signal Plan dated November 7, 2006, Wetland Evaluation and Delineation Report received September 16, 2004, Traffic Impact Analysis (revised) received June 23, 2005, Geological and Geotechnical Engineering Study (revised) received June 23, 2005 and other documents in the file. Exhibit No. -:-...... 1-----~ Item No. L..c:>!-1 l'Ot:>0.2 Received I 2. · /2 • O<.o MAIN FILE COPY ''\),\ King County Hearing Examiner -.• • .. · · L0,4P0002 -Fleuve Des\~· es (formerly Soos Creek) · November 9, 2006 Page 2 B. Issuance of this threshold determination does not constitute approval of the permit. This proposal will be reviewed for compliance with all applicable King County codes which regulate development activities, including the Uniform Fire and Building Codes, Road Standards, Surface Water Design Manual, and the Sensitive Areas Regulations. Threshold Determination The responsible official finds that the above described proposal does not pose a probable significant adverse impact to the environment, provided the mitigation measures listed below are applied as conditions of permit issuance. Mitigation List: The following mitigation measures shall be attached as conditions of permit issuance. These mitigation measures are consistent with policies, plans, rules, or regulations designated by KCC 20.44.080 as a basis for the exercise of substantive authority and in effect when this threshold determination is issued. Key sources of substantive authority for each mitigation measure are in parentheses; however, other sources of substantive authority may exist but are not expressly listed. • The proposed plat of Fleuve des Voiles has as its sole access a new leg of the Southeast 192nd Street/ 1241h Avenue SE intersection. In addition, the applicant for the preliminary plat of Fleuve des Voiles has submitted an application for the Cogger Short Plat. The Cogger Short Plat can not be developed without the public and private infrastructure in the Fleuve des Voiles preliminary plat, since the Cogger plat has no viable access without the roadway system in L04P0002. The two applications share stormwater facilities, are dependent upon one another, and have the same Applicant. The Department considers, for purposes of SEPA, the two applications to be "a development" for purposes of mitigation. • The intersection of Southeast 192nd Street/1241h Avenue SE was proposed to be improved as a part of a Capital Improvement Project: CIP 401004. This CIP would have included the construction of turn lanes on SE 192nd Street-to address an identified High Accident Location (14.80.030B)-and signalization of the intersection. Part of the rationale for signalization was to relocate an existing mid- block traffic signal for school-age pedestrians attending the Kent School District's Meeker Middle School. Part of the justification of the improvements was to address deficient levels-of-service on the existing northbound ( currently, the only 'minor street' approach to the intersection) approach to the intersection. • The County Executive's proposed 2007 -2012 CIP budget eliminated funding for this capital project. Funding levels are "$0" within the six-year horizon for adequacy of infrastructure to support this development proposal. No funding is available at the SEPA Detennination.doc 7/27/99 clc , · LQ4P0002 --Fleuve Des\ .,es (formerly Soos Creek) Noveinber 9, 2006 Page 3 horizon year of the development. The CIP was not funded with MPS fees collected by development in the area. • A calculated deficient level-of-service (14.80.030A) will exist at the horizon year of the development, as calculated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project -and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192nd Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. 1. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192nd Street/ 1241h Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 (attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left tum), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction Wwhen the deferred/cancelled CIP is constructed. • If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. • Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. Comments and Appeals Written comments or any appeal of this threshold determination must be received by King County's Land Use Services Division prior to 4:30 PM December 4, 2006. Appeals must be accompanied by a nonrefundable filing fee. Please reference the file numbers when corresponding. Appeals must be in writing and state the perceived errors in the threshold determination, specific reasons why the determination should be reversed or modified, the harm the appellant will suffer if the threshold determination remains unchanged, and the desired outcome of the appeal. If the appellant is a SEPA Determination.doc 7/27/99 clc LQ4P0002 -Fleuve Des . es (formerly Soos Creek) November 9, 2006 Page 4 group, the harm to any one or more members must be stated. Failure to meet these requirements may result in dismissal of the appeal. Comment/appeal deadline: Appeal filing fee: Address for comment/appeal: Lisa Dinsmore, Curr t Planni Current Planning Section Land Use Services Division SEPA Determination.doc 7/27/99 ck 4:30 PM on December 4, 2006 $250 check or money order made out to the King County Office of Finance King County Land Use Services Division 900 Oakesdale Avenue SW Renton, WA 98057-5219 ATTN: Current Planning Section /ri~ Signed I':'\ New iignt! pn!e io NW corner tbtll include 2 6i8Dt1 ht:tdi (one 3-setliun tnd one 4_-iectton for weilbouod left turn protecled-permiUed ~ pb.uing), a pedestntn i1gntl h.etd :t.nd pu,b. b11tto11 for new north leg croi:nnlt, t V\deo detection rtmera for we,tbaund approach., t11.d emergency pre-emption for both EB tnd WB tpproacbe1. Foundttion ihal! be located behind future King Coonty C!P tmproYCment1 as shown. _A_rea sbdl be level ind pne-d to face or pole. Signzl pole 1ha!1 inc!Dde one [uminure arm. S1gntl head mountings sb.tl! use 2stro ELiit1ug utihty poles to be relocated with north kg rold improveme.Dtt. ~ The north a.nd 8outh !cg vehicle detection shall be in groo.ud loop, with sptciog in accordance with KC requirements l 0 !o1tall uouwalk an~ ;top ban u sh()wn in accordance with King County requirements I :I l f':'\ New signtl.pole in N~ corner sb.tll lnc\ude 1 EijTIIIJ bttds, l pedednan hetds and pub button. Siiotl pale •.btll include \V ooe lurn1ni1re um. S1g11tl head mQuntingi shall use tenou. [II. tllii corner. the conlra!ler ctbrnet aod 1erv1ce ctbtoet sb~ll be inlallc,£1. Area 1h:1.!l be Incl ud paved tmind controller ao.d ;crvice ctbinet1 and role to top of curb. i ! Location of dgoal pole foundation ,b2!1 b.e bcltind future King County C P improvements. -JI"- f 0 New iigna[ pole 10 SW cw-ner 1h2I1 include2 &igntl hetds, ud 1 emergency vehicle detecton. and Juminaire :mn. [..pcatioo. or si gntl pole fou.odation $ball b.e behinde future K:C C [P improvement&. A sepu_ate pcdcr!rian .igul pole shall be constructed ntar the e:ii1tin& cro1swalk. tnd include one pedestrian signal head :1:od push b.ntton, plus one ,1gn prabih1ting crornngtbe wet! leg. ~ ---' SE-192NDS(-- ~----::::.:.:w::;;;=-·-----------·----··· ~ ----------------_ __JQ!. ------- 0 CD "'""' ..... Ne'* s-ignal pole in SE corner shall include 1 iigo:a! beach, and one video deltction camera ftcing west. No lum1n.aire. Mut um to consider Mnre EB left 1urn lane with toture tenon; no tigntl head. Pedestrian s1gDal b.eadi and ~ush Octtons !c beiu.ta!1td: on eol.e. EI.isting feace nnd gab.io.n wall need to be reso!vcri wilb conoideration of pedestriirn 1cces1 to bottons. Confl1ctug overbud power and underground uli!itie1 u well. D1Je IG grnde :rn<l visib.llty, an advance warniog {Juher (8" LED beacon) with W3·3 ,1gD 1hall be installed an wrnd or !J'.etal post. In add1t1uo. 1n adnnce emergency vehicle pre.emption detecto: shall be 1nstt.lled on the same po!e or in 1 similu I0c~t1on. Ccordinate w1th County (Scott Sawhill) regarding locat1011.. :pi!B.IJHf POPI' llSOCU.TES ,~ooo&.;-h.a.~ CONCEPTUAL SIGNAL PLAN !t11e .... ~~~~ ,.,..,..~..,.,.. .... <-=., Sf;: 1!t2nd Sl/1H·lh Ave SE King Coufity, WA ' 1: 11 Ii ~ lj I '!i I I r / 1 ' o" . I , , i I i I ~ :t:i' ' I ' iut I I' . J:., ,i I icl ,( ' gi 0 I/ I 4 j! GENERAL NOTES ! . Si ,:nal Pb.uiD g shall be 3 -ph11e; wi lh prolected/p~mll ssi ve WB !er: 1 u: u 1. EBIWB video detection ~ball be mounted cc rnut arm witb 5' rioer 3. Na pe~e~(nH crnmnlk ,:ir pede&(rian •ignal for "l'est leg 4. All •t.al :ale foundations sb.tll be Jnel ll/ttb King C~unty C!P zr1<le 5 · ¥~~~:C ~een 1u:i\0~~~Wfe °c'1o~~fr~l1t~~ls11 ;r~elt~~Fi~:iliocaMa, FLEUVE DES VOILES clDES,f LO~nael ~ § ().. J ~ ~: • . .>tice of Decision- Department of Development and Environmental Services Land Use Services DiVision SEPA Threshold Determination and Notice of Recommendation & Hearing 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 File No.: L04P0002 Project Name: Fleuve Des Voiles Subdivision (Formerly Soos Creek) DOES Project Manager: Chad Tibbits, 206-296-7194 Email: chad.tibbits@metrokc.gov Applicant: Project Location: Project Description: Permits Requested: Charles Spaeth 6839 Ravenna Avenue NE, Seattle, WA 98115 206-526-8481 The site is located on the north side of SE 192"d Street, west of 124th Avenue NE, approximately 19100-1241h Avenue SE, Renton, WA. Subdivision of approximately 6.8 acres into 39 lots for the development of single family detached residences in the R-6 zone. The proposed Jots range in size from approximately 4,00.0 to 12,000 square feet. Formal Subdivision Department Recommendation to the Hearing Examiner: Approve, subject to conditions Date of Public Hearing: December 12, 2006, 1 :30 pm DOES Hearing Room -first floor 900 Oakesdale Ave SW Renton, WA 98055-1219 SEPA Threshold Determination: Determination of Mitigated Non-Significance (MONS) Issued November 9, 2006 The Department of Development and Environmental Services (ODES) will issue a written report and recommendation to the Hearing Examiner two weeks prior to the scheduled public hearing. Persons wishing to receive a copy of the report should contact ODES at the address listed below. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Appeal procedures will be stated in the Examiner's written decision. Any person wishing additional information on this proposed project should contact the Project Manager at the phone number listed above. Written comments may also be submitted to DOES. A public hearing as required by law will be held to consider the approval of this application. If the Renton School District announces a district-wide school closure due to adverse weather conditions or similar area emergency, the public hearing on this matter will be postponed. Interested parties will be notified of the time and date of the rescheduled hearing. Any questions regarding postponements and rescheduling can be directed to the Hearing Examiner's Office at (206) 296-4660. Comment/Appeal Procedure on SEPA Threshold Determination: Comments on this SEPA determination are welcome. This SEPA determination may also be appealed in writing to the King County Hearing Examiner. A notice of appeal must be filed with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006, and be accompanied with a filing fee of $250.00 payable to the King County Office of Finance. If a timely Notice of Appeal has been filed, the appeiiant shall also file a Statement of Appeal with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006. The Statement of Appeal shall identify the decision being appealed (including the file number) and the alleged errors in that decision. Further. the Statement of Appeal shall state: 1) specific reasons why the decision should be reversed or modified; and 2) th&-·· harm suffered or anticipated by the appellant, and the relief sought. The scope of an appeal shall be based on matters or issues raised in the Statement of Appeal. Failure to timely file a Notice of Appeal, appeal fee or Statement of Appeal, deprives the Hearing Examiner of jurisdiction to consider the appeal. Appeals must be submitted to the Department of Development and Environmental Services (ODES) at the following address: Date Mailed: November 9, 2006 DDES--Land Use Services Division Attn: Permit Center 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 If you have any questions regarding the appeal procedures, please contact the Planner at the phone number listed above. If you require this material in braille, audio cassette, or large print, call (206) 296-6600 (voice) or (206) 296-7217 (TTY). BOSTON DESIGN & DEVELOPMENT LLC RICK BOSTON l 3425 E LK KATHLEEN DR SE RENTON, WA 98059 BROWN REBECCA 6839 RAVENNA A VE NE SEATTLE WA 98115 BUSH, BEN & GERI 19124 121ST PL SE RENTON WA 98058 CLAUSSEN, KIM PROGRAM MANAGER DDES/LUSD MS: OAK -DE-0100 COGGER 609 GRANT AVES RENTON WA 98055 DINSMORE, LISA CURRENT PLANNING SUPERVISOR MS: OAK -DE-0100 DDES I LUSD ERVIN, SHAWN 18848 120TH AVE SE RENTON, WA 98058 GILLEN, NICK WETLAND REVIEW DDESILUSD MS: OAK-DE-0100 HALLADIN, STEVE 19118 121ST PLACE SE RENTON, WA 98058 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 } L04P0002 L04P0002 L04P0002 HALVORSON, IVANA BARGHAUSEN CONSULTING ENGINEERS 18215 72ND AVES KENT WA 98032 HODGE, HAROLD D. 19210 121ST PL SE RENTON, WA 98058 HUMPHREY, TROY 31029THSTNE PUYALLUP WA 98372 JACQUES CONSULTING NEALJACQUES, P.E. 2633 SW 163RD PLACE BURIEN, WA 98166 KC HEARING EXAMINERS OFFICE A TIN: MARKA OR GINGER L04P0002 FLEUVES DES VOILES MS: YES -CC-0404 LANG, DE-EN 10658 RIVIERA PL NE SEATTLE, WA 98125 LANGLEY, KRIS TRAFFIC REVIEW ENGINEER MS: OAK -DE-0100 DDESILUSD LOZIER HOMES CORP JENNIFER MCCALL 1203-l 14TH AVENUE SE BELLEVUE, WA 98004 + MUCKLESHOOT CULTURAL RESOURCES PROGRAM ATTN. LAURA MURPHY & TAMMY JAMES 39015 172ND ST SE AUBURN WA 98092 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 GO!.!., SlllRLEY CURRENT PLANNTNG SECTION MS: OAK-DE-0100 DDES/LUSD SEATTLE KC HEALTH DEPT. "i-> E DIST. ENVIRON HEALTH 14350 SE EASTGATE WAY BELLEVUE WA 98007 SPAETH, CHARLES RAVENNA DEVELOPMENT LLC 6839 RAVENNA A VE NE SEATTLE, WA 98115 STEVENS, MARK f 19225124TIIAVESE RENTON, WA 98058 TOWNSEND, STEVE LAND USE INSPECTIONS MS: OAK -DE-0100 DDES / LUSD WARREN, SEAN & LINDA 19125 121ST PLACE SE RENTON, WA 98058 WEHRMAN, MARVIN Sll533RDAVEW. '\, EVERETT, WA 98203 WEST. LARRY GEO REVIEW DDES/LUSD MS: OAK -DE-0100 WHEELER, TIM j , 12131SE188THST. / RENTON, WA 98058 1 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 L04P0002 WHITING, KELLY KC DOT -ROAD SERVICES DIVISION MS: KSC-TR-0231 WHITT AKER, BRUCE SR. ENGINEER DDES/LUSD MS: OAK -DE-0100 WILSON, MARK & JOYCE 19205 124TH A VE SE RENTON, WA 98058 L04P0002 L04P0002 L04P0002 2817800150/L04P00r3c BERRYJACOB+JENN rt L 4144 32ND AV 5 SEATILE WA 9 126 6199000040/L04P0002 BROWN JAMES A & ETHEL 18834 120TH SE RENTON WA 98058 61 9000205/L04P0002 HAL EPHEN K+MARGIE B 19118 1 PLSE REN ON WA 98058 , 817800170/L04P0002 H HA LO D & HAZEL M 19210 1 T PL SE REN 8058 6199000140/L04P0002 HULSE JOHN H+CYNTHIA L 15404 SE 167TH PL RENTON WA 98058 28178000~0/~P 02 KOLB AL D +MASSEYILEESA 19235 12 P, SE RENTON WA 98058 6199000186/L04P 02 BREVIK DENN A PO BOX 03 4 % EING PEACE SNTL APO N OR Y 09038 6199000060/L04P0002 BUI KIM 10909 SE 222ND ST KENT WA 98031 SD9/L04P0002 G. ANDERSON, PLANT & FACILITIES KENT SCHOOL DISTRICT #415 12033 SE 256TH ST KENT WA 98031 6199000184/L04P0002 HALVERSON LINDA 5 19125 121ST PL SE RENTON WA 98058 6199000099/L04P0002 HOLMGREN JAY H 12205 SE 188TH ST RENTON WA 98058 2817800160/L04P0002 KAPADIA BHARAT A+HARSHA B 19218 121ST PL SE RENTON WA 98058 0422059124/L04P0002 KING COUNTY 500 KC ADMIN BLDG 500 4TH AV SEATILE WA 98104 28178000 / 4P0002 MCBRO REGORY A+MOLLY J 19213 1ST PL SE RENT N WA 98055 2817800130/L04P0002 BRISTER JAMES G+NANCY A 19242 121ST PL SE RENTON WA 98058 &l.99000200/, 04P0002 BUS JCT & GERALDINE A 1912 T PL SE RE ON WA 8058 2817800040/L04P0002 COUCH DAVID L & LISA U 19217 121ST PL SE RENTON WA 98058 6199000142/L04P0002 HALKO LOUIS M 19028 120TH SE RENTON WA 98055 7932000025/L04P0002 HANSON ALICE 12013 SE 192ND ST RENTON WA 98058 6199000262/L 0002 HUFFMAN REG/ 14744 5Tl>HW SE RE ON WA 98059 6199000125/L04P0002 KNOPP! THOMAS J+SALGUEROI BRENDAL 19007 120TH AV SE SEATILE WA 98058 6199000025/L04P0002 MARTIN FRANKL 12023 SE 188TH RENTON WA 98055 2817800020/L04P0002 MILLER JAMES M 19209 121ST PL SE RENTON WA 98055 2817800050/L04P0002 MOON KATHY 19225 121ST AV SE RENTON WA 98058 6199000100/L04P0002 PACHECO EDUARDO+DEBORAH A LEWIS 12139 SE 188TH ST RENTON WA 98058 6199000260/L04P0002 REL ESTATE PROPERTIES LLC C/0 LEVY ROBERT E MANAGER 3250 42ND AV W SEATILE WA 98199 6199000210/L04P0002 SLATIERY GLYN+DEBBIE 19107 121ST PL SE RENTON WA 98058 6199000240/L04P0002 THOMPSON JAMES LEEROY+ JUDIT 12218 SE 192ND RENTON WA 98058 6199000180/L04P 02 VANGO GARY LAR 19133 121ST L ~" RENTON A 98058 6199000215/L04P0002 WALTERS GARY A & TINA M 12204 SE 192ND ST RENTON WA 98058 6199000080/L04P0002 WHEELER TIM R+B,RANDIE J 12637 NE 68TH PL KIRKLAND WA 98033 2817800140/L04P0002 NOSARZEWSKI WOJCIECH+ANNA 19234 121ST PL SE RENTON WA 98058 6199000143/L04P0002 RITIER LAMONT D 19036 120TH AV SE RENTON WA 98058 6199000160/L04P0002 ROTH ROGER L 12004 SE 192ND ST RENTON WA 98058 7932000035/L04P0002 SELLAND RICHARD O+ANN M 615 S 96TH ST SEATILE WA 98108 2817800070/L04P0002 THOMPSON ROBERT A+FUGICH- THOMPSON HELEN C 19245 121ST PL SE RENTON WA 98058 6199000101/L04P0002 WEHRMAN MARVIN 5115 33RD AV W EVERETI WA 98203 6199000120/L04P0002 OLSON BERNARD J+ TERESA L 19004 120TH AV SE RENTON WA 98058 SD13/L04P0002 R, STRACKE, FACILITIES & PLANNING RENTON SCHOOL DISTRICT #403 1220 N 4TH ST RENTON WA 98055 6199000220/L04P0002 RITZ JANIE L 12208 SE 192ND ST RENTON WA 98055 6199000185/L04P0002 SCHOLES STEPHEN R 19113 121ST PL SE RENTON WA 98055 6199000182/L04P0002 SETILE STEVE 12054 SE 192ND ST RENTON WA 98055 0422059024/L04P0002 SWENSON REUBEN G 19226 124TH AV SE RENTON WA 98058 7932000036/L04P0002 TOLLETI WILLIAM D 12207 SE 192ND RENTON WA 98055 6199000050/L04P0002 VOLCKE ERHARD H 12053 SE 188TH ST RENTON WA 98058 6199000126/L04P0002 YEE PHILIP M & FANNY Y 11431 238TH AV SW WOODWAY WA 98020 6199000127/l04P0002 YEE PHILIP M & FANNY Y 11431 238TH ST SW WOODWAY WA 98020 6199000127/L04P0002 YEE PHILIP M & FANNY Y 11431 238TH ST SW WOODWAY WA 98020 (E Renton) FD25 (Spring Glen) FD40 Fire Protection Dist #25 Fire Protection Dist #40 P.O. Box 2925 10828 SE 176th St Renton WA 98056-0925 Renton WA 98055 MS: KSC-NR-0600 MS: KSC-TR-0431 KC27 Water & Land Res. Div Gary Kriedt King County Dept. of Natural Res. KC Metro Envirn. Planning Steve Foley LilS LI20 Fairwood Library Highlands Library 17009 -140th Av SE 2902 NE 12th St Renton WA 98058 Renton WA 98056 LI23 Documents Dept. Librarian LI24 Kent Regional Library King County Library System 212 --2nd Av N 960 Newport Way NW Kent WA 98032-4482 Issaquah, WA 98027 LI36 Administrator SES Renton Library Kent Sewer Utility 100 Mill Av S 220 -4th Av S Renton WA 98055 Kent WA 98032 Environmental Review Section ST2 Habitat Biologist, Rod Malcom TRl WA State Dept of Ecology Muckleshoot Indian Tribe PO Box 47703 39015 -172nd Av SE Olympia WA 98504-7703 Auburn WA 98002 Russ Ladley, Fisheries Biologist TR2 TR3 Puyallup Tribe Snoqualmie Tribe 6824 Pioneer Wy E PO Box 280 Puyallup WA 98371 Carnation WA 98014-0280 Fisheries Habitat/Environment TRS Richard Young TR4 Suquamish Indian Tribe Tulalip Tribe PO Box 498 7615 Totem Beach Rd Suquamish WA 98392 Marysville WA 98271 WD12 Public Works Dtr WD23 Cedar River Water/Sewer Dist Kent Water Dist 18300 SE Lk Youngs Rd 220 -4th Av S Renton WA 8058-9799 Kent WA 98032 City of Renton, Public Works Dept. WD32 WD41 Development Services Div. Soos Creek Water/Sewer Dist 1055 South Grady Way PO Box 58039 Renton WA 98055 Renton WA 98058-1039 Water Dist #90 15606 SE 128th St Renton WA 98059-8522 Water Dist #111 27224 -144th Av SE Kent WA 98042-9058 WA State Dept. of Wildlife Habitat Mgmt. Division P.O. Box 43155 Olympia, WA 98504-3155 WA St.DOT MS 230 15700 Dayton Ave. No PO Box 330310 Seattle, WA 98133-9710 WA St.DOT MS 250 15700 Dayton Ave. No. PO Box 330310 Seattle, WA 98133-9710 Roger Dorstad PO Box 375 Redmond, WA 98073 WD55 WD58 Coal Creek Utility District 6801 132nd Place SE Newcastle, WA 98059 WA State Dept. of Wildlife 16018 Mill Creek Blvd. Mill Creek, WA 98012 WA State Dept. of Ecology NW Regional Office 3190 -160th Ave SE Bellevue, WA 98008-5452 WA St DOT MS 240 15700 Dayton Ave No. PO Box 330310 Seattle, WA 98133-9710 WA St. Ecology Dept/WQSW Unit Linda Matlock PO Box 47696 Olympia, WA 98504-7696 Eleanor Moon KC Executive Horse Council 12230 NE 61st Kirkland, WA 98033 WD57 ' ! !! ti i f':"\ New >1&0.id pole in NW corner •ball ior.!ude 2 sigotl headr (one 3-section tod ooe 4.-•echon for we;tbound left turn pro!eeted-permitted ~ pbH10.gl, a pedestrian r1gn:il hetd :t.nd push button for new uorth leg cros11wtlk, a vtdeo detectio11. cameu for wutbound 11.pproacb, :rnd ernergen~y pre-emp(ioD. for both EB and WB tpproacbei. Foundllinn shill be localed behind fu1ure !Cioi County CIP improvemenl1 ~s shown. _Aret 1hall be level and paved to face or pole. Sigul pnle shall indijdt one [ulll.in11re arm. Siintl hnd moontiog: sbll! use astro EI.J~ting utility poles to be relocs.ted with north !eg rotd improvemeo!;, 0 Tbe nonh :t.nd soutti leg nbide detection shall be io groU.Dd !oopi; with spicing 10 accordance with KC requiremen1s 0 In,t:t!J no~iw~lk aod i:(op b:in u silown ,o auo1daoce with King County requneme11ls 0 0 New signal po!e 1n NE COJl!er ,hall include 2 11_gnal hHds. l pedutriin he,a.d1 and pn>b buttoni. Signalfole ,ball include: Joe lu~:naire :1tm. S1gul b.etd mounting, ,ball use ltnon,. !n thu come!, the controller ubinet an 1erv1ce cabinet ~ball be i91t11led. Are~ >hlll be level ud ~ved around contral!er and service .ca.bi nets ind pole to top of curb. L~catron ot signal pole foundation 1ha!I be bebind future King County ClP 1mprovemell!S. __. ii-- New 01gul pole 1n SW ceirner ,ha!! in.dude 2 s1gual bead,, ~lid l ernergeny vebicle delectors, and luminaire arm. :..oca1100 of signal pole foundation shall be behiDde future KC C[P improvemeotr. A separ_ate pedestrian ngntl pole shall t>t constructed near_ !be e1.1shng crouwdk: tnd include one ped"e,trian s1gul head and puob bntton, plus one ngn prohibiting crouing the wer! leg. B A "'°' I \ -----------L...l__ . SE 192ND ST ~--------= ---·--@-o..,;. --.- ------------------_.a ------- G) 0 ............ New signal pole in SE corner sball include 2 signal be2d'?., and one vtdeo detection umen facing wesl. No lominaire. Mut arm to con~ider future EB !eft turn Inc with future tenon; no sigiul be2d. Pedestrian signal betd1 ind pJsh ·~nttons lo be initallcd on ~ole. Elii;ting fence and g1bion 1nll need !o be re1nl"led w1tb. coucideri:tion er ;,e<lco:r,an HCeH le button:. Con!l1cl1ng overhead power and !!.nderground utilities u well. D~t :,; gnde ~nd v:sibilty, an advan~e w:i.rning fiHb.er (8" urn beaco!!.) wi!b WJ-3 sign stiaii be untalled on wood or melal posl. In l<l~1\1Jn. an ad-ance tll!ergoncy vehicle ~re-empl:cn deteclor sb:i.i! be inslllled on lhe same pcle or in a nmilu loc:i.tion. Ccnr0:1n~!e wit~ CCTun!y (Scott SiwOil[) regudrng lac1lion ~ JJ, 4 _.,.,.,---filture R!W ..,-------eii.ling north leg dri"Veway I I o/' I ' I I ' I I ' I ~ ~· I I r I ~- GENERAL NOTES I. Signal Phuiug shall be 3-pb:ue; wilh prolec!edlpemiiHive WB Jett turn 2 EBIWB video detections.ball be mounted un mast arm witb 5' ngr 3 Na pedest.riaD ~r~mnll or pede,trian ,ijnal for _west leg + A_ll urni:l pole foundation& sh.ti[ be ]eve with Krc.g Couoiy :"::LP grHt S. ~~ii~te ~eenain~0 ~h~1if 0b'e ~0ai~ter~Jif:~fs1 1:r~e)eu~8~r}[Z I ntil Im WILl.tAM POPI' AS50C!Afl!.S i,oo; ~-h-< I< '1<>i ,,,~,.,. WJ. .... 1 nl..:rt.\Q!Q ,.,. ....... "''-'"'<..<a~ CONCEPTUAL SIGNAL PLAN SE l!n"d St/12+1M A~e SE King Coun!y, WA r tr \: : tr: I (i I t;:. 0 ' . ' ~I I FLEUVE DES VOILES DDESI LO~P-0001 I t Q. ;j" s ~ 0 -ci 2o ,;;: \- -J v} ,.,-t-"iQ , ~ 6-,.. 0.:-~ JJ ·"" \/J 11 ti i I \I! 0 (08/21/2008) Kayren Kittr~<:k -Fleuve de<>" s / Cogger Road Variance Recommen · +· From: To: CC: Date: Subject: Dear Mr. Dye, Kayren Kittrick pete.dye@kingcounty.gov Corey W Thomas; Glasby, Kenneth 08/21/2008 9:22 AM Fleuve des Voiles / Cogger Road Variance Recommendation After talking to the Renton Fire Marshall's office, the City of Renton concurs with the recommendations of King County staff regarding the Road Variance Recommendation to a minimum tract width of 22-feet and 20-feet of pavement with one condition: Both sides of all the tracts shall be signed as "No Parking" with a painted fire lane in accordance with Renton Fire Department standards. If you have any questions, or need a formal letter, please do not hesitate to contact me. Sincerely, Kayren K. Kittrick Development Eng. Supervisor Permits & Inspections Development Services Division (425) 430-7299 Page 1 ~ King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, WA 98057-5212 206-296-6600 TTY 206-296-7217 www.kingcounty.gov August 18, 2008 Kayren K. Kittrick Development Engineer Supervisor 1055 South Grady Way Renton, WA 98057 RE: Road Variance Recommendation to the City of Renton Fleuve Des Voiles Snbdivision (Files L04P0002 and L08V0061) Cogger Short Snbdivision (Files L05S0040 and L08V0061) Dear Ms.Kittrick: :_ 1·;· :_;F F-rt.::l'li(.)t·J RECEIVED AUG 2 0 2008 BUILDING DIVISION King County is currently reviewing the Cogger Short Subdivision and Fleuve Des Voiles subdivision pursuant to terms of the interlocal agreement between the City of Renton and King County. The project site is located in an area recently annexed by the City of Renton, During our review of the subdivision, the applicant submitted the enclosed road variance application regarding the design of private streets within the development. To continue our review of the projects, a decision by the City of Renton is required for the road variance application. The following summary provides a description of the site issues and a recommendation from our licensed staff for the road variance. Findings: I. The project includes a subdivision and short subdivision with a total lot count of 47 residential units. A new public road will be constructed to serve the development which includes an intersection at 1241h Ave SE and SE 192nd Street. Primary roads within the subdivision are proposed as public right-of-way, however three short dead end streets are proposed for private access to residential lots. 2. The site plan for the project shows three private streets with a small turn around bulb at the street terminus. County standards do not require the tum around bulb for private tracts which are less than 150 feet in length; however, the applicant has chosen to construct the small turnarounds. 3. Both subdivisions have received preliminary approval from King County with conditions to comply with the 1993 King County Road Standards (KCRS). Section 2.09 in the road standards allows a road width of 22 feet for a private access tract serving up to six lots. In 2007, King County adopted new road standards which allow a narrower road width of 18 feet for a private tract serving up to six lots. The applicant is requesting a road variance to use the new King County standards with an 18 foot roadway and a 20 foot tract width. Kayren K. Kittrick August 18, 2008 Page 2 4. Based upon discussions with the King County Fire Marshall, the minimum width of a fire apparatus road is 20 feet. Since the applicant is seeking a road width less than the minimum fire standard, our office does not recommend approval of an 18 foot road width. The minimum road width allowed through the variance process would be 20 feet. Recommendation: King County recommends approval of a variance to allow the design of private access tracts with 20 feet of road width and a minimum tract width of 22 feet. Except for the allowed reduction in road and tract width, all other applicable standards in the 1993 King County Road Standards shall apply. The enclosed variance application includes a site plan prepared by the applicant's consultant. A traffic report for the project was not included with the variance application. Please review the variance application to determine if you agree with our recommendation. If you have questions or need any additional information regarding the variance application, please contact Pete Dye at 206-296-7185 or via email at pete.dye@kingcounty.gov. Sincerely, ~~~r Raymond E. Florent, PLS Acting Supervisor, Engineering Review Section Land Use Services Division Enclosure: Road Variance File L08V006 l cc: Pete Dye, Senior Engineer tQ KingCounty Department of Development and Environmental Services 900 Oakesdale Avenue southwest Renton, WA 98057-5212 206-296-6600 TIY 206-296-7217 [~ ·-Project Name: ·-- ! FLEUVE des VOILES & COGGER Short Plat Project Address and Parcel Number. 123xx SE 192 St, 6199000-260, -240 & -241 Applicant/Design Engineer Name: De-Enla"""n"'-~~~~~~~~~~~~ Address: 10658 Riviera PL NE Web Date: 1112.7/2007 ROAD STANDARDS VARIANCE REQUEST TO THE COUNTY ROAD ENGINEER For alterna~formats. call 206-296-6600. Lo&-voott, / Date: ' 6/20/08 En I Fim, Name: Lang Associates, Inc. Telephone: 206 306-8880 City, State, ZIP: DOES Engineer Initials: Seattle, WA 98125 0 Route Application to LUIS '--·· D Check here ff project engineering plans are approved and construction has begun. INSTRUCTIONS TO APPLICANT/DESIGN ENGINEER: Please be sure to includle all plans, sketches. photos and maps which may assist in complete review and consideration of your variance request. For a complete list of road variance submittal requirements, refer to separate list from ODES. Failure to provide ali pertinent information may result in delayed processing or denial of request. Please submit this request and applicable fee to the Department of Development and Environmen1al Services (ODES) Permit Center at 900 Oakesdale Ave. SW, Renton, WA 98057-5212. To make an appointment for permit submittal, please call 206-296-6797. For more information, refer to the ODES Web site, www.kingcounty.gov/permits. --···REFERTOSECTION 1.08 OF THE KING COUNTY ROAD STANDARDS FOR VARIANCES.·- DESCRIPTION OF VARIAf,IC-EREQUEST: ... . --~-·--·· ··-· .... Allow Private Access Tracts (Tract B, F & H) constructed to King County 2007 KCRDCS 2.09.B standards. ~ ~.E r~, [;.: [I 1:117 le ~ It. •,\.T; I_' I \1_/ [~ APPLICABLE SECTION($) OF STANDARDS: .fl., ,ll/N 2 3 2008 KCRS (93) 2.09.B K.C DD E.S. JUSTIFICATION (see attachments, pages to To be consistant with the newly adopted 2007 KCRDCS 2.09.B which allows PAT with 18' paving in 20' tract to serve up to 6 dwelling units and reduce cut & fill by approximately 25%. AUTHORIZATION SIGNATURES· DOES STAFF RECOMMENDATION DEPARTMENT OF TRANSPORTATION AUTHORIZATION n Annroval n Conditioned .on=val n Denied County Design Engineer. Date Development Engineer/Designee: Date County Road Engineer: Date CONDITIONS OF APPROVAL: . Check out the DDES Web site at www.kingcounty.gov/permits FDV RoadStandardsVarRe(I le-rqu-rdvar.pdf 11127/2007 Page 1 of 1 J KingCounty Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Web date: 06/28/2007 CERTIFICATION OF APPLICANT STATUS Renton, Washington 98057-5212 206-296-6600 TIY 206-296-7217 For alternate formats, call 206-296-6600. Permit Number: L04P0002 & L05S0040 Activity Number: Lo ?-Vo O & I -~~~~-=-=-=--1,---- Permit Name: FLEUVE des VOILES & COGGER SHORT PLAT FOR INDIVIDUALS: I, (print name), hereby certify that I am the/an owner of the property which is the subject of this permit. If I am not the sole owner of the property, I certify that I am authorized to represent all other owners of the property. My mailing address is: I further certify that I am the "Applicant" for this permit and as such am financially responsible for all fees and will receive any refunds paid. I shall remain the "Applicant" for the duration of this permit unless I transfer my "applicant" status in writing on the form provided by DDES. " Sig nature of Applicant -OR- FOR CORPORATIONS/BUSINESS ASSOCIATIONS: Date Signed I, Charles Spaeth (print name), hereby certify that I am an authorized agent of Ravenna Development, LLC , a corporation or other business association authorized to do business in the State of Washington, which is the sole owner of the property that is the subject of this permit. If this corporation or business association is not the sole owner of the property, I certify that this corporation/business association is authorized to represent all other owners of the property. The mailing address of this corporation/business association is: 6839 Ravenna Ave NE, Seattle, WA 98115 I further certify that the above named corporation/business association is the "Applicant" for this permit and as such is financially responsible for all fees and will receive any refunds paid. This corporation/business association shall remain the "Applicant" for the duration of this permit unless it transfers its applicant status in writing on the form provided by DDES. " ~ .. ~ r8cu4;._ -'J~un-'e'--'1=8'-", 2=0=08'--=~------- ' Signature~plicant's Agent Date Signed * By signing as the Applicant or the Applicant's Agent, I certify under penalty of perjury under the laws of the State of Washington that the information provided above is true and correct. CertApplicantStatusFORM lc-cer-apstat.pdf 06/2812007 Page 1 of 2 K.C. D.D.E.S. I I • NOTICE TO APPLICANTS: By law, this department returns all engineering and other plans to the applicant. If, however, you wish to authorize the department to return engineering and other plans directly to the engineer, architect, or other consultant for the limited purpose of making corrections, please designate below: [81 I authorize this department to return plans directly to my consultant(s) for the limited purpose of making corrections as designated on this form. CONSULTANTS: Lang Associates, Inc. 10658 Riviera PL NE, Seattle WA 98125 Taylor Engineering Consultants, 205 Front St. S P.O. Box 1787 Issaquah, WA 98027 Check out the DOES Web site at www.kingcounty.gov/permits CertApplicantStatusFORM lc-cer-apstat. pdf 06/28/2007 Page 2 of 2 Cogger L08V0061 ,t Schools/School FadhtieS /',/Trails N TOMlShlplifleS S-T-R / \ ,' QSl.lNES 'N. SECLJNES N lWPUNES N Streets Water Bodies Road Rlgh\HI-Way CJ ZC.,ing ParcelS 0Par1<S D ctieS 0 1000 1 ·= 2000 feet 2000 Feet tQ King County The lni'orrnttion ~ on thll map has been (l()n'l)led by l<irv Counly ataff trom • v....., of~ tncS • aqec:1 io c:hlir9e w,ll"ICU notice . King Cou1"iy make* no repr~ OTW9ff .... lH. eiq:ftMOI' mpllfd, U \0 \ha ,o;,s.::y, c::ornpe....._ timelinna. or rigtu to h uN C, u:h inl'.cmwllon l<r9 County thall not bit 1ia. for •rtJ gtntrtl, apeci.af, lndnd. ~•. or conNqUef'liial damages lnc:fudtrQ, bul not hmiled to, \o9' ~ or lost P'(lfibraN~ from u. uae o, mi...-or lhe irl()(m8lion oonllined on l'\it map NT'/ .. o1 thlil nw.p Of s,kwmallon on thhl map b prohbttd axcept t>y written pennitlion of 1C<Nrt1 Plot date: Jul 2. 2006; lldde6001\x01'Qtslav_dev\proj8CIS\base2.3Pf OFFICE OF THE HEARING EXAMINER KING COUNTY, WASHINGTON 400 Yesler Way, Room 404 Seattle, Washington 98104 Telephone (206) 296-4660 Facsimile (206) 296-1654 Email: hearex@metrokc.gov January 12, 2007 REPORT AND DECISION SUBJECT: Department of Development and Environmental Services File No. L04P0002 Proposed Ordinance No. 2006-0565 FLEUVE DES VOILES Preliminary Plat Application Location: On the north side of SE 192nd Street, west of I 24th Avenue Northeast, approximately 19100-124th Avenue Southeast, Renton Applicant: Charles Spaeth represented by De-En Lang Lang Associates, Inc. 10658 Riviera Place Northeast Seattle, Washington 98125 Telephone: (206) 306-8880 Facsimile: (206) 362-6848 King County: Department of Development and Environmental Services (DDES) represented by Chad Tibbits 900 Oakesdale Avenue Southwest Renton, Washington 98055 Telephone: (206) 296-7194 Facsimile: (206) 296-7051 SUMMARY OF RECOMMENDATIONS/DECISION: K.C DDE.S Department's Preliminary Recommendation: Department's Final Recommendation: Examiner's Decision: EXAMINER PROCEEDINGS: Hearing opened: Hearing continued administratively: Hearing closed: Approve, with conditions Approve, with revised conditions Approve, with further revised conditions December 12, 2006 December 12, 2006 December 13, 2006 L04P0002 -Fleuve des Voiles Page 2 of 14 Participants at the public hearing and the exhibits offered and entered are listed in the attached minutes. A verbatim recording of the hearing is available in the office of the King County Hearing Examiner. FINDINGS, CONCLUSIONS & DECISION: Having reviewed the record in this matter, the Examiner now makes and enters the following: FINDINGS: 1. General Information: Applicant: Engineer: STR: Location: Zoning: Acreage: Number of Lots: Density: Lot Size: Proposed Use: Sewage Disposal: Water Supply: Fire District: School District: Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 206-526-8481 Taylor Engineering Consultants 205 Front Street S. Issaquah, WA 98027 425-391-1415 SW 33-23-05 The site is located on the north side of SE l 92"d St., west of 124th Avenue NE. R-6 7.07 acres 39 Approximately 5.51 units per acre Approximately 4,000 to 7,200 square feet in size Single Family Detached Dwellings Soos Creek Water and Sewer District Soos Creek Water and Sewer District King County Fire District No. 40 Renton School District No. 403 Application completeness date: October 1, 2004 Associated Applications: Drainage Adjustment L05V0040 2. Except as modified herein, the facts set forth in the DOES reports to the Examiner and the DOES and King County Department of Transportation (KC DOT) testimony are found to be correct and are incorporated herein by reference. 3. The subject property is a 7.07-acre, irregularly-shaped parcel located north of Southeast 192nd Street at the present northerly stub terminus of 124th Avenue Southeast,just west of Soos Creek in the unincorporated Renton area. The terrain of the site consists of two benches connected by a short fairly steep slope downward to the east. The benches are relatively flat to gentle in grade; L04P0002 -Fleuve des Voiles Page 3 of 14 4. 6. 7. the general grade of the site is from west to east down toward Soos Creek. The property is vegetated with a moderately dense wood of successive-growth mixed-species native overstory with typical Northwest understory and ground cover. The properties are located within the Upper Soos sub-basin of the Soos Creek basin. A Class 1 wetland, a defined sensitive area under the applicable version of Chapter 21A.24 KCC, is located just offsite of the northeast portions of the property bordering Soos Creek. A single-family residence and outbuildings are located on the property (and will be removed upon development). The surrounding area is generally residentially developed at lower large-lot suburban densities, and a school to the east, but is undergoing infill to higher-density suburban development within the urban growth area. Applicant Charles Spaeth proposes subdivision of the property into 39 lots for detached single- family dwellings, as well as separate tracts for drainage facilities, open space and recreation. The density would be approximately 5.5 dwelling units per acre, with lot sizes ranging from approximately 4,000 to 7,200 square feet in area. The Applicant is simultaneously developing the adjacent proposed Cogger short subdivision (file L05S0040), an eight-lot, .93-acre short subdivision proposed for the property directly abutting to the south between the site and Southeast 192nd Street. Concurrent development will allow for the Cogger property to be developed without a separate access onto Southeast 192nd Street, an arterial road; it will use access via the subject subdivision. Vehicular access to the proposed development and the Cogger short subdivision will be provided by improvement of the existing 124th Avenue Southeast right-of-way, which runs due north from Southeast 192nd Street to join the property on the south boundary of the northeasterly-most projection. From there, the road would curve northwest and then due west to form a looped road network that would have two cul-de-sacs branching from it to serve some of the development's own lots and a third to extend south from the southernmost portion of the loop to provide access to the Cogger short subdivision lots. A stub road would also branch from the internal loop northerly to connect with I 22nd Avenue Southeast within the proposed Wehrman subdivision to the north (L04P0027, which has recently been granted preliminary plat approval). The Wehrman subdivision provides a through route north up to Southeast 188th Street, which would provide connection westerly to 120th Avenue Southeast. Common recreation facilities are to be developed within Tract C of the subject property and Tract A within the Cogger short subdivision, to be shared by the residents of both developments. 1 Although this arrangement does not meet the absolute letter of the code provisions in KCC 21A.14.180, which require location onsite and centrality within each specific development, it will be permitted in this case2 given a) the direct adjacency of the properties; b) simultaneous development; c) unified control over both developments; and d) their both proposed to be governed by a single homeowners' association. In addition, and as importantly, the fact that the tracts are in separate developments is not a practical or safety concern in the instant case, since the road crossing to gain access to them would be no more than would be 1 Part of the reason for the property configuration which results in the Cogger recreation Tract A (even though it is on the side of the street of the bulk of the subject development, whereas all of the Cogger lots are on the south side of Southeast 191st Street) is that some boundary line adjustments (BLA) have been perfonned or are proposed in order to optimize the lot layout for the subject development. 2 As it has been in a very few past cases of similar circumstances. L04P0002 -Fleuve des Voiles Page 4 of 14 typically provided in a single larger development with an internal road system. The road crossings to gain access to the intended recreation facilities are over subaccess, low-volume roads and the proposal provides the requisite safe convenience and accessibility which lay at the heart of the subdivision recreation facility requirements. 8. The development's resident public schoolchildren will be bused to their respective middle and high schools, and students at the elementary level will walk to their designated elementary school, which at present is located to the northwest on 120th Avenue Southeast, with the most direct walking route via the aforementioned preliminarily approved but yet-to-be-developed Wehrman subdivision abutting to the north. Conditions of preliminary plat approval must accordingly be imposed to assure that safe walking conditions are provided for public school children residing in the development with some contingency if the Wehrman development is not completed prior to final plat approval of the subject development. The Wehrman development was made subject to conditions requiring that appropriate provisions be assured for safe walking conditions for school pedestrians, and in effect, the subject development is dependent upon those improvements, or an effective alternative, for such assurance. 9. The traffic impacts of the proposed development will be mitigated under the requirements of County code with respect to Chapter 14.70 KCC (Transportation Concurrency Management) and Chapter 14.75 KCC (Mitigation Payment System). In order to comply with Chapter 14.80 KCC regarding intersection standards, the Mitigated Determination of Non-Significance (MONS) has imposed a mitigation measure requiring the installation of a traffic signal at the project's 124th Avenue Southeast entry onto Southeast 192nd Street. 10. The development's surface water drainage will be collected and conveyed to stormwater drainage facilities in proposed Tract B, which will lie upslope of the wetland buffer contained with Tract A. The property is subject to the 1998 King County Stormwater Water Design Manual (KCSWDM) and must meet the standards for Level I detention and Basic water quality standards (the Cogger short plat is subject to the more recent 2005 KCSWDM standards, but the interrelationship of the two standards is accomplishable with the proposed stormwater design program). A drainage adjustment (L06V0040) has been approved for the two developments to allow the use of a shared stormwater facility. 11. Neighboring residents submit comments expressing concern about the density and character of the development as being out of scale with the existing development in the area and a reduction in the existing residents' quality of life. The density of development is fully permissible under the existing R-6 zoning, which has been in place for a number of years in implementation of the state Growth Management Act and the County's implementing Comprehensive Plan and zoning. The Examiner has no authority to disallow the proposed density of development, which the Examiner notes is approximately half a unit per acre less than the maximum achievable under the base density of the applied R-6 zone. Other concerns expressed have to do with drainage and potential flooding, which will be fully addressed for regulatory compliance by conformity of the development with the applicable stormwater detention and water quality maintenance standards. Lastly, concern is expressed regarding some debris such as used tires on the property and the need for cleanup. That will presumably be accomplished during plat preparation and construction, since materials such as those are disallowed in construction fill and grading for development. L04 P0002 -Fleuve des Voiles Page 5 of 14 12. The Fire District No. 40 Fire Marshal expresses concern regarding the road widths of the proposed development and the need for fire equipment access. The King County Fire Marshal has recently instituted a more assertive program of fire suppression rules applied to development, wherein if road widths are provided as narrow as the 1993 King County Road Standards (KCRS) permit, then individual structures may be subject to individual fire sprinklering requirements at the residential building permit stage. The matter is therefore left to post-preliminary plat consideration by the Applicant in deliberating the relative viability of those alternatives, and any accommodations which may ensue from discussions with the appropriate fire officials. 13. Chapter 21A.38 KCC's special overlay requirement S0-220 (Significant Tree Overlay) applies to the property. The Significant Tree Overlay standards require the development to retain a percentage of the significant trees onsite. To implement KCC 21A.38.230, a detailed tree retention plan must be submitted with the engineering plans for the subdivision. CONCLUSIONS: I. The proposed subdivision, as conditioned below, would conform to applicable land use controls. In particular, the proposed type of development and overall density are specifically permitted under the R-6 zone. 2. If approved subject to the conditions below, the proposed subdivision will make appropriate provisions for the topical items enumerated within RCW 58.17.110, and will serve the public health, safety and welfare, and the public use and interest. 3. The conditions for final plat approval set forth below are reasonable requirements and in the public interest. 4. The dedications of land or easements within and adjacent to the proposed plat, as shown on the revised preliminary plat submitted on June 30, 2006, or as required for final plat approval, are reasonable and necessary as a direct result of the development of this proposed plat, and are proportionate to the impacts of the development. DECISION: The preliminary plat of the Fleuve des Voiles subdivision, as revised and received June 30, 2006, is approved subject to the following conditions of approval: I. Compliance with all platting provisions of Title 19A of the King County Code. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. 3. The plat shall comply with the base density and minimum density requirements of the R-6 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environment Services. L04P0002 -Fleuve des Voiles Page 6 of 14 Any/all plat boundary discrepancy shall be resolved to the satisfaction of DOES prior to the submittal of the final plat documents. As used in this condition, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187, as amended (1993 KCRS). 5. The applicant shall obtain documentation by the King County Fire Protection Engineer certifying compliance with the fire flow standards of Chapter 17.08 of the King County Code. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location oflots as shown on the approved preliminary plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in K.C.C. 9.04 and the King County Surface Water Design Manual (KCSWDM) must also be satisfied during engineering and final review. a. Drainage plans and analysis shall comply with the 1998 KCSWDM and applicable updates adopted by King County and must meet the standards for Level I detention and Basic water quality standards. DOES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes, as established by DOES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts, footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings # on file with DOES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. e. A drainage conveyance pipe is required to allow for offsite stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sired appropriately, per the KCSWDM at engineering plan submittal. f. The I 00-year floodplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. L04P0002 -Fleuve des Voiles Page 7 of 14 g. A drainage adjustment (L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 7. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: a. I 24th Ave SE and the internal loop road shalt be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. b. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated for the obtainment of additional R/W at the northeast corner of the proposed SE 192"d St/124th Ave SE intersection, required to construct the 124th Ave SE improvements. The necessary R/W, which is shown on a Proposed Land Transfer Diagram received June 30, 2006, shall be acquired prior to engineering plan approval. c. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Noles to this effect shall be shown on the engineering plans and the final plat. d. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 8. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. 9. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The applicant has the option to either: ( 1) pay the MPS fee at the final plat recording, or (2) pay the MPS fee at the time of building permit issuance. If the first option is chosen, the fee paid shall be the fee in effect at the time of plat application and a note shalt be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shalt be the amount in effect as of the date of building permit application. 10. Off-site access to the subdivision shall be over a full-width improved road which has been accepted by King County for maintenance. If a proposed access road meeting those standards has not been accepted by King County at the time of recording, then said road shalt be fully bonded by the applicant of this subdivision. 11. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in the applicable version of Chapter 21A.24 KCC (the pre-2005 version). Permanent survey markings and signs as specified in K.C.C. 2 lA.24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers ( e.g., with bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. L04P0002 -Fleuve des Voiles Page 8 of 14 12. Preliminary plat review has identified the following specific requirements which apply to this project. All other applicable requirements from K.C.C. 2 IA.24 shall also be addressed by the applicant. Wetlands Class I wetland(s) shall have a minimum buffer of 100 feet, measured from the wetland edge. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A IS-foot building set back line (BSBL) is required from the edge of all Sensitive Area Tracts and shall be shown on all affected lots. Signage shall be installed along the Sensitive Area Tract boundaries for long term protection and to clearly mark the extent of the tract. Sensitive area tract boundaries shall be clearly marked with bright orange construction and silt fencing prior to construction or site clearing activities. The boundaries shall remain marked until construction is complete. Road crossings of wetlands and/or buffers maybe allowed per KC 21A.24.330. Construction techniques such as retaining walls maybe required to limit impacts. Allowed impacts shall require mitigation. A final mitigation plan shall be required during engineering review. Off site utility construction within wetlands, aquatic areas, or buffers may require additional permits. This will be reviewed and determined during engineering review. Wetland hydrology may not be altered either during or after development. A hydrology analysis may be required during engineering review to show how wetland hydrology will be maintained after the site is developed. The engineering plans shall be routed to Critical Areas Staff for review of compliance to the above conditions. Alterations to Streams or Wetlands If alterations of streams and/or wetlands are approved in conformance with K.C.C. 2 IA.24, then a detailed plan to mitigate for impacts from that alteration will be required to be reviewed and approved along with the plat engineering plans. A performance bond or other financial guarantee will be required at the time of plan approval to guarantee that the mitigation measures are installed according to the plan. Once the mitigation work is completed to a DOES Senior Ecologist's satisfaction, the performance bond may be replaced by a maintenance bond for the remainder of the five-year monitoring period to guarantee the success of the mitigation. The applicant shall be responsible for the installation, maintenance and monitoring of any approved mitigation. The mitigation plan must be installed prior to final inspection of the plat. L04P0002 -Fleuve des Voiles Geotechoical Page 9 of 14 Clearing is not permitted on this site between October I and April 1 unless it is in compliance with King County Code 21A.220 (erosion hazard areas). If clearing is proposed during the October 1 through April 1 time period the applicant must delineate all on-site erosion hazard areas on the final engineering plans (erosion hazard areas are defined in K.C.C. 21A.06.415). The delineation of such areas shall be approved by a DOES geologist, and the requirements found in K.C.C. 21A.24.220 concerning erosion hazard areas shall be met. The applicant's geotechnical engineer shall provide recommendations for the design and construction of the road, onsite grading and compaction, subsurface drainage, and all required retaining walls. The geotechnical recommendations shall be included in the T.I.R. and incorporated into the design with submittal of the engineering plans. The report must specifically address any setback requirements for future structures from any proposed retaining walls, and any setback requirements must be shown on the final engineering plans. Any required easements for maintenance of walls or subsurface drainage must also be provided on the final plans. Special geotechnical construction inspection of the road improvements, onsite grading and compaction, subsurface drainage, and any required retaining walls is required. Special construction inspection of the above construction elements is required to ensure compliance with the geotechnical report recommendations and to address unanticipated soil and groundwater conditions. Daily inspection reports shall be submitted to the assigned King County Land Use Inspector during the Construction phases of those improvements. A final construction report shall be submitted verifying compliance with the geotechnical recommendations and providing foundation design parameters for future residential construction. Notes requiring the above shall be shown on the engineering plans. Geotechnical special inspection of bearing soils for future home foundations is required. Notes to this effect shall be shown on the engineering plans and the final plat. 13. The following note shall be shown on the final engineering plan and recorded plat: RESTRICTIONS FOR SENSITIVE AREA TRACTS AND SENSITNE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including control of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tract/sensitive area and buffer. The vegetation within the tract/sensitive area and buffer may not be cut, pruned, covered by fill, removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency, unless otherwise provided by law. L04P0002 -Fleuve des Voiles Page 10 of 14 The common boundary between the tract/sensitive area and buffer and the area of development activity must be marked or otherwise flagged to the satisfaction of King County prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tract/sensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot building setback line, unless otherwise provided by law. 14. Suitable recreation space shall be provided consistent with the requirements of K.C.C. 21A.14.180 and K.C.C. 21A. 14.190 (i.e., sport court[s], children's play equipment, picnic table[ s ], benches, etc.). a. A detailed recreation space plan (i.e., location, area calculations, dimensions, landscape specs, equipment specs, etc.) shall be submitted for review and approval by DOES and King County Parks prior to or concurrent with the submittal of engineering plans. b. A perfonnance bond for recreation space improvements shall be posted prior to recording of the plat. c. The development's recreation space may be provided commonly with the adjacent Cogger short subdivision (L05S0040) as proposed and as discussed above, provided that the applicant demonstrates that a single homeowners association (see Condition 15 below) will be established for both developments and covenants provide for mutual and common use pennission. In the event that the Cogger short subdivision is not platted in near concurrency and/or the lots in the subject development are not established in a homeowners association common with those of the Cogger short subdivision prior to or at the time of final plat approval, the subject subdivision shall provide onsite recreation facilities in full conformity with KCC 21A.14.180. 15. A homeowners' association or other workable organization shall be established to the satisfaction of ODES which provides for the ownership and continued maintenance of the recreation space and sensitive area tract( s ). 16. Street trees shall be provided as follows (per KCRS 5.03 and K.C.C. 2JA.16.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards, unless King County Department of Transportation determines that trees should not be located in the street right-of-way. c. lfKing County detennines that the required street trees should not be located within the right-of-way, they shall be located no more than 20 feet from the street right-of-way line. L04P0002 -Fleuve des Voiles Page 11 of14 d. e. f. g. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the county has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. The species of trees shall be approved by ODES iflocated within the right-of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers, or that is not compatible with overhead utility lines. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DOES prior to engineering plan approval. The applicant shall contact Metro Service Planning at (206) 684-1622 to determine if !24th Avenue SE is on a bus route. If 124"' Avenue SE is a bus route, the street tree plan shall also be reviewed by Metro. h. The street trees must be installed and inspected, or a performance bond posted prior to recording of the plat. If a performance bond is posted, the street trees must be installed and inspected within one year of recording of the plat. At the time of inspection, if the trees are found to be installed per the approved plan, a maintenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after ODES has completed a second inspection and determined that the trees have been kept healthy and thriving. 17. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is subject to change based on the current county fees. 18. The following have been established by the MONS under SEPA authority as necessary requirements to mitigate the adverse environmental impacts of this development. The applicant/developer shall demonstrate compliance with these items prior to final plat approval. A calculated deficient level-of-service (KCC 14.80.030A) will exist at the horizon year of the development, as calculated by the Applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (ODES File #L04P0028), 100% of the trips from the Fleuve des Voiles project and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192nd Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and jointly with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. In order to mitigate the significant adverse impact (14.80.030A and l 4.80.030B) that the proposed development will have at the intersection of Southeast 192nd Street/I 24th Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006. This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of L04P0002 -Fleuve des Voiles Page 12 of 14 Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/pennitted phasing for the westbound left turn), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the detennination of a complete application for this subdivision. Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section forreview and approval. 19. To implement former K.C.C. 21A.38.230 which applies to the site, a detailed tree retention plan shall be submitted with the engineering plans for the subject plat. The tree retention plan ( and engineering plans) shall be consistent with the requirements of former K.C.C. 21A.38.230. No clearing of the subject property is permitted until the final tree retention plan is approved by LUSD. Flagging and temporary fencing of trees to be retained shall be provided, consistent with former K.C.C. 21A.38.230.B.4. The placement of impervious surfaces, fill material, excavation work, or the storage of construction materials is prohibited within the fenced areas around preserved trees, except for grading work permitted pursuant to former K.C.C. 21A.38.230.B.4.d.(2). 20. A note shall be placed on the final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of the proposed lots, consistent with K.C.C. 21A.38.230.B.6. 21. If the adjacent Wehrman subdivision development (L04P0027) is not completed prior to final plat approval of the subject development, certification shall be provided by the King County Department of Transportation that safe walking conditions are provided for public elementary schoolchildren residing in the subject development, along a reasonably direct and lawful route to their elementary school or, in the alternative, that they are provided with school bus service to the school and safe walking conditions are provided to the pertinent school bus stop. ORDERED January 12, 2007. ~-----------Peter T. Donahue King County Hearing Examiner TRANSMI I I ED January 12, 2007, to the following parties and interested persons of record: Barghausen Cons. Eng. Attn: Ivana Halvorson. 18215-72ndAve. S. Kent WA 98032 Dennis Brevik 19103 -121st Pl. SE Renton ·w A 98058 Rebecca Brown 6839 Ravenna Ave. NE Seattle WA 98115 L04P0002 -Fleuve des Voiles Ben & Geri Bush 19124 -121st Pl. SE Renton WA 98058 Steve Halladin 19118 -121st Pl. SE Renton WA 98058 Jacques Consulting Attn: Neal Jacques 2633 SW 163rd Pl. Burien WA 98166 Muckleshoot Cult. Res. Attn: L. Murphy & T. James 39015 -172nd St. SE Auburn WA 98092 Mark Stevens 19225 -124th Ave. SE Renton WA 98058 Tim Wheeler 12131 SE 188th St. Renton WA 98058 Lisa Dinsmore DDES/LUSD MS OAK-DE-0100 Kristen Langley DDES/LUSD MS OAK-DE-0100 Larry West DDES/LUSD MS OAK-DE-0100 Cogger 609 Grant Ave. S. Renton WA 98055 Harold Hodge 19210 -121st Pl SE Renton WA 98058 De-En Lang Lang Assoc., Inc. I 0658 Riviera Pl. NE Seattle WA 98125 Seattle KC Health Dept. E. Dist. Environ. Health 14350 SE Eastgate Way Bellevue WA 98007 Sean & Linda Warren 19125 -121st Pl. SE Renton WA 98058 Mark & Joyce Wilson 19205 -124th Ave. SE Renton WA 98058 Nick Gillen DDES/LUSD MS OAK-DE-0100 Chad Tibbits DDES-LUSD MS OAK-DE-0100 Kelly Whiting KC DOT, Rd. Srvcs. Div. MS KSC-TR-0231 NOTICE QE RIGHI IQ APPEAi, Page 13 of 14 Shawn Ervin 18848 -!20th Ave. SE Renton WA 98058 Troy Humphrey 310 -29th St. NE Puyallup WA 98372 Lozier Homes, Corp. Attn: Jennifer McCall 1203 -114th Ave. SE Bellevue WA 98004 Charles Spaeth Ravenna Devel., LLC 6839 Ravenna Ave. NE Seattle WA 98115 Marvin Wehrman 5115 -33rd Ave. W. Everett WA 98203 Kim Claussen DDES/LUSD MS OAK-DE-0100 Shirley Goll DDES/LUSD MS OAK-DE-0100 Steve Townsend DDES/LUSD MS OAK-DE-0100 Bruce Whittaker DDES/LUSD MS OAK-DE-0100 In order to appeal the decision of the Examiner, written notice of appeal must be filed with the Clerk of the King County Council with a fee of $250.00 (check payable to King County Office of Finance) on or before January 26, 2007. If a notice of appeal is filed, the original and six (6) copies of a written appeal statement specifying the basis for the appeal and argument in support of the appeal must be filed with the Clerk of the King County Council on or before February 2, 2007. Appeal statements may refer only to facts contained in the hearing record; new facts may not be presented on appeal. Filing requires actual delivery to the Office of the Clerk of the Council, Room 1025, King County Courthouse, 516 3"' Avenue, Seattle, Washington 98104, prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if actual receipt by the Clerk does not occur within the L04P0002 -Fleuve des Voiles Page 14 of 14 applicable time period. The Examiner does not have authority to extend the time period unless the Office of the Clerk is not open on the specified closing date, in which event delivery prior to the close of business on the next business day is sufficient to meet the filing requirement. If a written notice of appeal and filing fee are not filed within fourteen ( 14) calendar days of the date of this report, or if a written appeal statement and argument are not filed within twenty-one (21) calendar days of the date of this report, the decision of the hearing examiner contained herein shall be the final decision of King County without the need for further action by the Council. MINUTES OF THE DECEMBER 12, 2006, PUBLIC HEARING ON DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES FILE NO. L04P0002. Peter T. Donahue was the Hearing Examiner in this matter. Participating in the hearing were Chad Tibbits, Bruce Whittaker and Kristen Langley representing the Department; and De-En Lang representing the Applicant. The following Exhibits were offered and entered into the record: Exhibit No. I Exhibit No. 2 Exhibit No. 3 Exhibit No. 4 Exhibit No. 5 Exhibit No. 6 Exhibit No. 7 Exhibit No. 8 Exhibit No. 9 Exhibit No. I 0 Exhibit No. 11 Exhibit No. 12 Exhibit No. 13 Exhibit No. 14 Department of Development and Environmental Services file no. L04P0002 Department of Development and Environmental Services Preliminary Report, dated December 12, 2006 Application for Land Use Permits received February 4, 2004 SEPA Environmental checklist received February 4, 2004 SEPA Determination ofNon-significance issued November 9, 2006 Affidavit of Posting indicating a posting date of March 8, 2005; received by ODES on March 9, 2005 Preliminary plat map received June 30, 2006 (Revised) Revised Level I Downstream Analysis prepared by Taylor Engineering Consultants, received March 31, 2006 Certificate of Water Availability from the Soos Creek Water and Sewer District dated June 17, 2005 Certificate of Sewer Availability from Soos Creek Water and Sewer District, dated June 17, 2005 Conceptual Recreation Plan received March 31, 2006 Revised Conceptual Grading and Drainage Plan received March 31, 2006 Letter from Ben and Geri Bush faxed December 4, 2006 Letter from Sandy Haydock, Fire District 40, dated December 12, 2006 The following exhibit was entered into the record on December 13, 2006: Exhibit No. 15 December 14, 2006 (received by e-mail December 13) DOES memorandum regarding landscaping inspection fees PTD:ms L04P0002 RPT PROJECT REQUEST FOR.11 ,'LANNING/BUILDING/PUBLIC WORKS 1 DATE 6/21/oe CONTACT: rP'.A/Gt.Jase~ EXTa,' 7~8 I F1LE STATUS //)fffiw OR o EXISTING: FILE coDE (PRI-XX-xxxx) / LOCATION jCD-1'Jy Work Space: / D File Bay Shelf#: / D Other: /PROJECTNAME/FILETITLE:£7.,€/Jl/£,Q/Es vt)/(f;S Sv~~/z: ajP. , (70 characters max) / UTILITY PERMIT# LUA# WO# ______ _ ADDRESS/STREETNAME(S):4/'b? ;Ue"" .AveSe'. ~781?JJ! DEV~~~ ; OWN: ; CNSLT/ENG'Z-1-_J,Z<""-"'E""---- OTIIER ALIASES:~~('/fi J:iwve;x Circle Size of Waterline: Circle Size of Sewerline: Circle Size of Stonnline: 8" 8" 12" 10" 12" Circle One: 10" .12" Circle One: 18" 24" Circle One New I Replace / Extension New/ Replace / Extension New I Replace/ Extension I CHECK EACH DISCIPLINE INVOLVED IN PROJECT Ltr Drwg # of sheets D TED D TRO D WWP D WTR D SWP D PLR WATER . "'-/el'.' ·/. 1f3't: D D (off site improvements) (include TESC) D D (Signali2'.ation, Channelization, Lighting) D 0 (sanitary sewer main, include basin name) D D (Mains, Valves, Hydrants) (inc. composite & HorizontalCtrl) D D (CIP onlyXinclude basin name) (For Developer Files Only) D (letter only) PLEASE CffiCLE THE DISCIPLINES WHICH NEED TO SIGN MYLARS WASTEWATER SURFACE WATER TRANSPORTATION FIRE FOR F1LE MAINTAINANCE USE ONLY J--,c-------~rn:rl~-----t--~------!'~l:rrt .. _,;1,. ~-------,--,-,,. ;rl-,-----~~-------;,i ,.-~?-;ff{.: I _;rct ·: •i.\i. Date : To From Subject Project Subdivision # : Permit# Owner Location Lots Sensitive Areas: SCS Soll Class.: Zoning Size : Purpose Geo Trends, Inc. Mar. 20, 2004 Rick Boston -1:.._ ·:, -.' .'"" I Boston Design & Development, LLC 13425 E. Lake Kathleen Dr. SE Renton, WA 98059 ---!' i ; i / ./!J) .6 2GD4 c......,1 Steve Pappajohn, Geologist Geotech Report '<.coo-. . .t:.s. Soos Creek Plat AA03P0286 N.A. Boston Design & Development, LLC SE SW Sec. 33, Twp. 23N, Rng. SE, WM (see attached map) 1-32 ( see attached plat} Erosion Hazard (King County Map Folio, Dec. 1990-(see attached map) Alderwood (AgD)-SCS King Co., Nov. 1973 (see attached map) King Conaty R6 6.2 acres. The purpose of this report is to characterize certain geotechnical aspects of the above-captioned property especially in respect to slopes stability and soil permeability. An erosion hazard is indicated as possible based on the available reference. · Summary A site visit was made to the property and the adjoining properties on December 30, 2003. The purpose of the visit was to inspect the natural and existing conditions of the property and to make observations regarding soil profiles, ground water conductivity, slope stability and other salient factors the location and suitability of building sites. Existing topographical information was also used in the characterization. Research and interviews were conducted to establish the history of the property, to gather important information about previous activity on the property, and to determine the details of all salient aspects of the property that may effect its development. Preliminary site plans were also reviewed. From surface conditions, local geology, and observations from adjacent developed and undeveloped areas, soil cooditiom appear to be COIL'listent with mapped records. Characteristic A1derwood soil associations consisting of wooded upland terraces and slopes, composed of glacial material, are laterally continuous and consistent. Slope measurements confirm terraces of less than 6% grade to slopes areas of up to 28o/o grade. All areas contained characteristic stable surface conditions with no evidence of sliding, mass wasting, or creep. (see attached topo map) No evidence of water -bearing or --directing horizons (springs) was observed at the surface or along the slope. Characteristic Douglas fir-Alder forest, with typical fern and scrub understory prevails on and adjacent to the parcel. The Soos Creek drainage is to the east of the eastern boundary of the property. Geology Vashon glm:ial till deposits and post-glacial stratified terrace drift dominate surface geology at the site. Soils in this region consist mostly of well-sorted sandy and gravelly IOIIJD above a substratum of compacted till designated as Alderwood Soils in this portion of King County. In the Puget Sound region, deposits of this type are thought to have occurred at, and proximal to, the retreating front of the Puget glacial lobe by large ice-marginal melt-water streams during the most recent ice-age. ' .. Geo Trenas, Inc. Infiltration T e,tB Tine (3) test pits (Nos. 1, 2, &3) wwe eoosen mr mr water infiltratioo tests to determine the ptt,neabtlity charactaisties on the east side of the proposed de'lelopment in lhe BRa where rdmrion / infiltration fadlities would go. The pits varied in depth from 3.5' to 9.0 fcet deep and wae eadl app.oainwmly 24" wick (see photcs). The soils were well chined and similar in all pits, see soil profile. Tesls wen, conducted on Dec mbel" 30 2003 and on Mardi 3 20!M to IIIICOI,, 111111 die~ seas oo The pits were let\ open and olJscnations during Jamwy and Februry sbowod no "'1dMfing water. C.ooditians during the teslS -cold and very Wf:t with die soils in 8llftC'D( well sauated due 1o pa weeks ofheavy rain (aod snow in Decanber) up to the day oftest. Tes1s -oooducled per King County Falling Heed Pacolation Test procedure. Test holes - dug to 1he probable depdl of infiltration fiu:ilitiea to be designed. Due to sandy soil with lhinimal clay, and the wet conditions, a J0-6081t was not done but multiple tests verified a COIISistant result. They we tested over an approximaaly 90 miwe period. sflllliog with a waler depth 8" from 1he bottom of the pit and refilled as required (typically after a 310 4 inch drop). Pwcolation ~ need as fullow.l 'WIIS afta-a Slabilized coosis!ant rate accured. Falling Head Percolation Test Results (minutes/inch) Pit l.atioa Dqitll Swlw.e ..... ldllnlioa Rate l:lefttilta Elffamll #1 Center, 260' west of 4.0fcet 406 402 10.0 min/ inch east line #2 SB COIIICl", l7S' wat 3.S fcet· 386 382.5 7.1 min/inch of east line 13 Center, 130 fcet west 9.5 &et 386 376.S 8.0 min/ inch of east line • &.4min/loch · The water table elevation in this low area of the site appears to be approximately 373 elemion. This was based on observation of several pits over die 2 momh wet period: #4 (occational short duration water at elev 373), IS (no waw aD seasm at elev 374), and 17 (standing water at 372.S), and noting 1liat the wetland deliamti.on line lies at approximately 1he 374 elevation line. Geo Trenas,r..c. LalMlsllde aad Rm Slopes AIUllms The site was reviewed for steep slope.1 via on site visual inspection and analysis of the topographic rontours (at 2' ~) uiawed by Evcigreen Precision Surveying. This site has an overall slepewesttoeast of 16.3%(100''612'). The western edgoupper plateau at elevation 476 is about 4% (4' nOO'), the lem edge lower valley flat area is7..3% (IO'/IS0'), 8IJd a beoch in the middle at elevation 440-430 is roughly a 5" (3'Ni0'} slope. The two inclined-._ and below the beoch an= roughly 20 to 2S % slopelhm n.qui.ing ,:.e1Sideudioos fir landslide. Landslido an,a is defined as an:as over 15%, comprised of silt or clay soils intc:rbcikd with sand, 1111d 1hr: pn:sence of BfOWJd war. Ta pils-1ed that soils DD slopes were twenty fuur to thirty-six inches of sandy loam over a dense glacial till. No indicatioo of slides were noted anywhefe on the site. It is n:commcndecl that good fiAn•lwli, m pa..tiws be= tblJowed by loc:a•it,g '--iup on this solid base. Also subsurface waters from the IJIIIIIII" pl I I Cravel lbru the soi) at the glaeial till lewf. lhos it is n:commcndecl that this surfila, --be captnred at chD top of the site (watem edge) such that oftsite dtainage (which flows onto the site) can be routed to bypass this site. Wrth these rec:ommendation impJemented, there is no likelihood of landsfldes. "Steep slope&", defined u inclilles ~ 40% Wilh a rise ova-10 tb:t. are idlllified and shown on the. topographic map. Note shaded areas A, B, C, .& D,. these represent sleep slope areas; natc that these range between 10 and 20 feet in total rise. Note also that these are not natural but were created by man made cuts (likely made in the 1970s or l980«'to level the lower valley aad thc CCllla' bench fur homes and yard area). Code allows for an exemption from S!'tbal:b if so,1s are stable and rise under 20 feet Wttically. Thus a careful review of the geology related to stability was made. As per tho soils portion of this niport the undalying glacial bll is very stable and wen drained in these particular areas. Review was made of laTain, vegda1ioo, and si7.e and stmigbtness of the lrcles; no slide evi.dllnce exists. Noto also that these slopes are margioally dassified as "steep". Measurement with the inclinHneter indicated kas than 36% grade, only detail analysis of lbe topogiapbical 11111p ind'~ aled SOllle sela:t anlllS are just hardy 40% owr 10 root rise(nonestaqJer}.. Tus, tllemwl •• is Cllat• _.,..,.. a&etwill-by ~ tllae ueas thlm setllaek ,eq9hemca• if n:qvln:d. ''. This conclusion is fi!rther strengtbaned by considering the propmed site plan (Jot layout) and construetioo plam as slllbt hy the developer. Per eodl; ~ is penniUed if these slq,es wen formed due to man made grading, they were. •In an:as A and C the slope rise is 12 to 14 fillet, with slight re-grading this will be nxluced to "non steep sk,pe'°; it is noted that tbe site plan (lot layout) is desi8f1ed fir daylight has CIII IR homes configured fur this. •Area Bis not in ilseJf"51eep slope" fit is 20%) but when coupled with the slope cut of area A it becomes so and generalillS a rise of 20 k When this lower-A is n,.gn,ded(libly by re filling the old exc:avation) tlRIS Ix iuging the A + B <Mnll slope to 32% it is no longer a "sta:p slope" classification. •Ana D SOl!thcm end slope rise is 16 k This is planned to be n:umad as "steep slope" and the exc:q,tioo fir no setback should be applied here. At the northern end the rise is 12 feet. This - is to be re-graded slightly and to provide for the proposed roadway, dlUS efrminering the "sta:p slope" classification in this area. .. Geo Trends, hie. References Geologic Map of the Renlnn Quad, King County, Washington, 1965, US Geologic Survey Soil Survey, King County Area. Washington, 1973, US Dept. of At,., Soil Couservatioo.Service Engineering Geology in Washingtmi. 1989, Waslringmlt Dq,art.inent ofNatmal Resourccis Bull. 78 Water R.esouto::s of King Comity, Wasl.futton, 1968, OeologicaJ ~Water S~ Paper 1852 King County Sensitive Anlas Ordinam:e 9614, King County, Washington. September I 990 DisclahM:r This report ClOIUD iuto.mation !bat is intended solely to dllllaaaize the geologic oonclitions and other aspects of the sub,rlct property and is for use only by qualified geoteclmical professionals and regulatc,y officials; Any other use m relimlce is to be~ a misuse. The filc1s, findings, opinions, judgments and conclusims OO'lllaincd in this report an1 pres, ated on a "best eff'arts" basis, based on the best information available as obsaved in the field, as nhllUPf'd through generafiy aa:epted professional practices. and as reviewed by other qualified pasonnel with the appropriate ·regwaklry agencies. Due to tlle t1attm: of geologic investigation and the pulmtial ex· t :• of uabowD, unknowable, cooea:aled <r otbcrwise 11111qiorted <> nliti<ms ur facts in. on. or lllllB" the suiject jiiupaty, conditions other dmn those lqlOl'll:d '--'-. -. In I,"·· _.....,... . of...... • • ..:... --" aRiRiUI may, m MIIW, exist. a,+w-~ wuWt.icatiuU .u.;; ccsstmg :1!11» may e&pOSC or ciadc waacsa.n condilioos and hazards liMlt are beyond the scope of lhis report.. No wammty of any kind, either mqm:ssed or implied, is included herein. Sincerely, . --. ,;-· --,• :ii-< --· .. -. :-,.;. -""" -;·~,.-/. ~ . ~ -" . ~·':' . - ~"'-·'• ; . i.~ "I ....... KINS CO • ... ii,. ~ ~r~ '~ ''I y ·;,, --1111> • CJ) :-~-·1:j ~ (0 t\J ~ t.,::; VJ ~ I ~ ··········-················ '4ci__:_.i....: -.,¢ ..,..Po 43iii-+- 4 p -1-- 464 32 482 4iO 4~ 16--l--+ 41.1-+ 41;:j-+ ll 41 p----=f... 45ii 06 404 402 396-1---f lIOUSl,' ······················----.- 434 ~ 'o ... ~ ~ iARTEA--D ~ ~N1'06'56''E 300.00' · .. ~ \"'"-:'--PA;,,~~~4>4 ... · ~ . . · ' · · : : .... /--....:_: . . . . ~---.:..:.:..:.. · .. . . 4 32 ------==-. . . . -.. "'-...: -_., ~.--=-::::---·-r-· -.r~ ~ -c C /~,,-:.,;.42~~;~a; +--· -~zf.J' 71 Iii \ 2,'o ·. : ~ -\ t> ·. : i . ---. . ~ \ ....... .. ........ , 428 lO ' : ~ : W ' \ c3 \ A_~'l':.A C. ~ \ I ~ • µ ~ ti} U1 k ' \ ,., ; m \ ......................... .. g \ ::-1 \ .ARt!A .B l / + tl AR.EA A-· ,;,~ /'<O~i-t+ \ ,.,_'?! I /fft ""' ':>"" / N1 '03"18"E 88.00' '{tt-~ /':>o,'<>/ ))J (386 U1 \ \ s.Y.;9. 0: ' . ,~ ~ . ~ \So=s c:,FEK PL~g mm0 ~ \ £..o CATI o i\..J <:, ~ .sTEEP SLl:> :S ; ......... ii; ....... ) ... ..L ..... / ~ Bl gJ ·..;, o>.,,. '-. ---------- -----------~-----~~-406 404 402 -400 . 398 -- 394 392 ;,x o'6'. 388------~ -390 ~394 -......_~9,~ 388 ............._ -----386 ~-------~386---3e, ~---~~---~-38~-------- ___ 38A _....,...-· --____...., 38 382 ~ \ ( >lfo 7~ FotZ ';HJ'J I R 1SE) : ~ i ) i31 ('j\ I ,'J. I 1:,:, , / : b:t:; \ SCA'""-" I '..::.,...c . ~-.................... ' , \ --~ "' . . ............. . .. Sot.., i'ZCi' . .' .. f, , "3 ___.\.-..E'_VCcR.Gti~ PIZ~IS1.:.,.J SUI<! U lc''r,..i<:;--,1,,,_---\----· -/ .. ~~ 2.0C>~ --382 I r66·--5 \ . /\~ .. aao~--= ------------~ Ii> ::::fa~ I~ / -'1¢'------™-_ .,,,.-----..-378 .':>'o?, /cj ni 378 6- 3 7 s------'"" C >~ 1'1\'5 ,zz·AO'"il \67 ?;fo' ' ' ' ' :--J3sA ' ' ' ' ' I ,r..._ . . .-.. ·······<>au=--,.,.,.,, ,/'-;J 31£> ~ /~'?P '?,1'o 01 ~'~~·/ x-... -----"' > ~ ~ /> -'" ,nw ...,. w ru ~ 378-~'?,1'o N1 '03'18''E 176.67' 3~ ~6 lJl Erosion Hazard Areas Kent 87 5 .. -~· l l ' -~1 ' i.: .,.Bo·. 3! 2 L/~K &, I Soos Creek Plat if A, ~ I g I '"' I ~ J , --y R. 2 E. R. 3 E. .. .. SOIL ASSOCIATION SOIL ASSOCIATIONS R. 4 E. Alderwood association: Moderately well drained undulating to hilly soils that have dense, very slowly permeable glacial t/11 at a deplh of 20 to 40 inches; on uplands and terraces Oridia-Seattle-Woodinville association: Somewhat poorly drained and very poorly drained, nearly level soils; in major stream valleys • Buckley-Alderwood association: Poorly drained and moderately well drained, '0?;{{7/ nearly level to rolling soils that have densebslowly permeable and very //~!@ slowly permeable glacial till at a depth of 2 to 40 inches; on glacial till plains and uplands ~ Ever~tt ass_ociation: ~omewhat exces. sively drained, gravelly, gently un-L:..2:21 dulatmg soils underlain by sand and gravel; on tenaces • Beausite-Alderwood associatiqr: Well drained and moderately welfcf111ined, gently rolling to very steep soi s that have sandstone or sha e or dl!iille, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands Alderwood-Kilsap-lndianola association: Moderately well drained., nearly ~ level to steep soils that have very slowly permeable glacial till or glacial ~ lake deposits at a depth of 16 to 40 inches, and somewhat excessively drained; rolling, deep sandy soils; on uplands and terraces Puget-Earlmont-Sn.ohomish ass~c.i.ation: Poorly drained and _so!"ewhat poorly drained nearly level so1ls. that have layers of peat w1thrn a Jew feet of the surlace; in major stream valleys N 1 6 Miles Soos Creek .. I • & • .. LOCATION OF SOIL TEST TS I t aaoa C:IBC ...._.a n a -~=--·-=•-.......... -..... • {) ' i r~ : -f ;i . nt 0 ' ti> L. 1 ~i i ti •• • I: • (jl~ iJ .I . Pi . 11 I ., I I , • I I ' - \~i .,.-.-. a KING COUNTY, WASHINGTON, SUJIFACE WATER DESIGN MANUAL REFERENCE 6-A FALLING HEAD PERCOLATION TEST PROCEDURE Source: EPA. Onsite Wastewater Treatment and Disposal Systems, 1980. Number and Location of Tests A minimum of three tests shall be performed within the area proposed for an absotption system. They shall be spaced uniformly throughout the me-a. If soil conditions are highly variable, mme · tests may be required. Prepara11on of Test Hole The diameter of each test bole is 6 inches, dug or bored to the proposed depths of the absorption systems or to the most limiting soil horizon. To expose a natural soil surface; the sides of the hole ,_ are scratched with a 5WllJl pointed instnmJCnt and the loose matmial is removed from the bottom of the test hole. Two inches of*-to *-inch rock are placed in the hole to protect the bottom from scouring when the water is added Soaking Period 11¢.·hole is carefully filled with at least 12 inches of clear water. The depth of water shouW be maintained for at 1~ 4 hours and preferably ovcmight if clay soils are present. A funnel with an attached hose or similar device may be used to prevent water from washing down the sides o€ the hole. Automatic siphons or float valves may be employed to automatically maintain the water level during the soaking period. It is extremely important that the soil be allowed to soak for a sufficiently long pcdod of time to allow the soil to swell if accurar.e results arc to be ootained. In sandy soils with little or no clay, soaking is not necessary. If, after filling the hole twice with 12 inches of water, the water seeps completely away in less than te£i minutes, the test can proceed immediately. 1 91 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Measurement or the Percolation Rate Except for sandy soils., percolation rate measurements are made 15 hours but no more than 30 hours af1cr the soaking peiiod began Ally soil t1Jat sloughed in to the hole during the soalcing period is removed and the water level is adjusted to 6 inches above the gravel (or 8 inclies above the bottom of the hole). At no time during the test is the water level allowed to rise more thm 6 inches above the gravel. hnmediately after adjustment, the water level is mcasmed from a fixed teference point to the nearest 1116111 inch at JO-minute intuvah. The test is continued until rwo successive water level drops do not vary by mote than 1/16 inch within a 90-minute prriod. After each measurement. the water level is readjusted to the 6-inch level. The last water level drop is used to calculate the percolation rate. In sandy soils or sot1s in which die fim 6-inch of water added aft.er the soating period seeps away in less lhan 30 minutes. water level measmemcnts am made at !0-111i11111e intervals for a 1-houl- period. The last water level drop is used to calculate the percolation rate. Caltulation of the Perco1aUon Rate . The percolation rate is calculated for each teSt hole by dividing the time interval used between measurements by the magnitude of the last water level dwp. This QllcoJation results in a pen;olation rate in timllS ofminuteSfmclL To determiJJe the pen:oJatioo rate for the uea, the ral!:s obtained from each hoJe me averaged. {If tests in the area vary by mom than 20 minnteslinch. variatiOIIS in soil type are indicated. Under these cin:umstances, percolation rates should not be averaged.) Example:. lf the last measured drop in water level after 30 minutes is 5/8-inch, then: 1 ! ... Percolation rate ;: (30 minutes)/(5/8 inch) "' 48 minutes/inch. 9/11911 2 1998 SutfaC<e WB!...-!Jcsign Manual Top; Pit 2 -Preparing for infiltration test Bottom: Pit 2 -Sandy loam, roots and cobbles Left: Pit 3 -Water for infiltration test Right: Pit 3 -42 gallons total Pit 8 -Sandy Loam with pebbles and roots Top: Near Pit 8 -Natural Slope looking NlOW Bottom: Near Pit 8 -Existing Terrace looking S10E Left: Pit 9 -Large boulder from till at base of pit Right: Pit 9 -Water enters from west at loam/till contact Left: Pit 10 -Water up to base of sandy loam Right: Pit 10 -Gray till from bottom of pit ~ ~ ~ "O ..... ..... ..... ~ Qc ~ f.t-1 I(') = • e ~ ..... = ..... ..... ~ ..... = I ..Q Qc e ~ ~ = "O J:: fl'.> = QI •....C .,C ___ ,..__ -CJ ~ .5 = 1""' \C C, 1""' ~ ..... ..... = ~. ~ ;.y,• .. ,, ~ ..... ' ·-!i • lf1t,. '• l'; ... ,v ~~ .1~ ..... l ' ),· \ . ..... '• ~-·" ~ ·~ ' t. • ..... •• ..... ..... .c ..... ~ •• ~ aa •• ct: ~ ~ Top: Pit 12 -Note sandy loam from pit -Pit 6.5' deep Bottom: Just east of Pit 12 -26°/o grade looking north Gary A. Flowers, PLLC Geological & Geotechnical Consulting th 19532 12 Avenue NE February 14, 2005 Project No. GF05001 Ravenna Development, LLC John Minden/Charlie Spaeth c/o JM Architects 12115 100th Ave NE Kirkland, WA 98034 Subject: Geological and Geotechnical Engineering Study Plat ofFleuve des Voiles SE 192°d Street@ 124th Avenue SE King County, Washington Shoreline, WA 98155-1106 This report presents the results of our geological and geotechnical assessment for the ;roposed 39 lot plat to be located north and west of the intersection of SE 192nd Street and 124 Avenue SE in King County, Washington. The plat will be comprised of three separate tax parcels. At this time only the center parcel has any previous development. · The purpose of our site evaluation was to document existing shallow soil and ground water conditions on the property, including existing slope stability, and to provide data for the design and construction of the planned improvements. Preliminary site plans by Taylor Engineering Consultants, dated September 15, 2004 were used as a reference for this study. PROJECT & SITE CONDITIONS According to the preliminary site drawings provided to us, the subject parcel encompasses about 7.7 acres, and is irregular in shape. It is bounded on the north and east by undeveloped property, on the west by single family residences, and on the south by single family residences or SE 192°d Street. A total of 39 building lots are planned for the plat along with improving 124th Avenue as an entrance road, new internal streets and utilities and storm water treatment and infiltration facilities. See Figure 1, Site & Exploration Plan. The subject site is comprised of several distinct areas. The lower portion of the site is relatively flat, heavily vegetated with bramble bushes and small deciduous trees along with a few larger evergreen trees, and is undeveloped. The entrance road, storm water management facilities, recreational facilities and a native growth protection area will be located within this area. :\..~ co't''< tA~\\'l f~ 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 206-417-7640 g- u,tli. ~ t Plat of Fleuve des Voiles Geo/ogical/Geotechnical Assessment Kent, King County, Washington The central portion of the property slopes upward to the west at an overall slope gradient on the order of 23 percent. Relief is about 84 feet over a horizontal distance of 355 feet. Several steeper and flatter areas are located on the central portion of the site. These areas all appear to be the result of past cutting and filling operations on the site for past and current roads/driveways, and development of a single family residence (Thompson residence) and large garage/shop. The areas that have been oversteepened by past cutting and filling are on the order of 10 feet or less in height except immediately below the existing homeowner' s large garage/shop where the slope is on the order of 14 feet in height. All of the oversteepened areas appear to be currently stable with no obvious visual evidence of slope movement. The area is heavily vegetated with evergreen and deciduous trees, some bramble bushes and other native understory. The upper (westernmost) edge of the property is located at the top of the east facing slope. This area is previously undeveloped except for a couple of small sheds. This area is nearly flat and is heavily vegetated with bramble bushes and both evergreen and deciduous trees. No evidence of standing, flowing or emergent water was observed on the sloping area of the site. No visual indications of slope instability, either current or past, were observed. Subsurface Soil and Ground Water Conditions In order to characterize the shallow subsurface soil and ground water conditions on the property a total of 14 exploration pits were excavated on the parcel on January 26, 2005. The explorations were placed at the approximate locations shown on Figure 1. Four pits were excavated on the lower portion of the property to evaluate the soils for potential infiltration of storm water and/or potential ground water impacts to treatment ponds. Another twelve pits were excavated around the site to evaluate the soils for slope stability, foundations, utility placement and pavement support. All of the pits encountered a layer of forest duff and organic topsoil that was generally on the order of 12 to 14 inches thick. This layer was only 4 to 7 inches thick in EP-4 and EP-7, both areas that were disturbed by past grading operations. The topsoil layer was 21 to 32 inches thick in EP-3 (fill?), EP-12 and EP-16. Fill soils were encountered in EP-7, alongside the existing gravel driveway, overlying a relic topsoil layer. The fill soils were about 18 inches thick and consisted ofloose, brown, moist, silty sand with some gravel. The upper 32 inches of soil in EP-3 may also be fill, although the material is almost entirely organic topsoil. Fill soils were not observed in any of the other explorations. However, we anticipate that additional fill soils will be encountered along the slope below the existing driveway, residence, shop and drain field areas near the center of the site. These soils will be removed or regraded during site grading operations. 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155~1106 2 206-417-7640 • Plat of Fle11Ve des Voiles Geologica//Geotechnica/ Assessment Kent, King County, Washington Underlying the organic topsoil layer in exploration pits EP-1, 2, 3, 4, 8, 13, 14, 15, and 16 a loose to medium dense, brown to reddish brown to grayish-brown, sand, gravelly sand or sandy gravel with trace to some silt was encountered. Tbis material 'is interpreted to be recessional outwash sediments that were deposited by meltwater streams emanating from the retreating glacial ice sheet during the Vashon stade of the Fraser glaciation. All of the exploration pits where this sediment was encountered, except for EP-8 and EP-13, are located near the valley bottom. Exploration pits EP-8 and EP-13 are located slightly higher up the side of the slope and may be ice contact sediments that were deposited along the margin of the ice sheet as it was retreating. The recessional outwash sediments extended the full depth of the explorations pits in EP-1, 2, 3, 4, 14, 15 and 16, to a maximum depth of 13 feet beneath existing ground surface. In EP-8 and EP-13, the recessional outwash or possible ice contact sediments, were underlain by dense to very dense, brownish-gray to grayish-brown, sandy gravel to gravelly sand. Tbis material is interpreted to be advance outwash sediments that were deposited by meltwater streams in front of an advancing ice sheet during the Vashon stade of the Fraser glaciation. As such, these sediments have been consolidated by the overriding weight of several thousands of feet of glacial ice. In exploration pits EP-6, 7, 9, 10, 11 and 12, beneath the forest duff and organic topsoil, or beneath the fill soils in EP-7, medium stiff, moist, brown, sandy silt with some gravel over very dense, moist, brownish-gray, silty sand with gravel was encountered. Tbis sediment is interpreted to be Vashon age lodgement till. Lodgement till is a nonhomogenous mixture of sand and gravel in a silt/clay matrix that was deposited at the base of an advancing ice sheet and subsequently overrun and consolidated by thousands of feet of glacial ice. The upper couple feet of this unit have been weathered to a less dense, finer grained condition. The lodgement till extended to the bottom of all the exploration pits where it was encountered. According to the Geologic Map of King County, Washington, by Booth, Haugerud and Sacket, 2002, the subject site is mapped as Vashon age till on the hillsides and Vashon age recessional outwash sediments near the valley bottom. Our interpretation is in general agreement with the published map for the area. Hydrology No indication of standing or flowing water was present on the property at the time of our field work. There was no evidence of erosion anywhere on the parcel. Water infiltrates relatively easily into the upper soil stratum. As a result, it is anticipated that most storm water currently infiltrates into the subsurface sediments and then moves as interflow atop the unweathered lodgement till until it encounters the sands and gravels of the recessional and advance outwash deposits where it is able to further infiltrate. Interflow generally follows surficial topography and for this project would flow towards the east. 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 3 206-417-7640 • Plat of F/euve des Voiles Geo/ogical!Geotechnical Assessment Kent, King County, Washing/on Ground water was encountered in exploration pits EP-1, 2, 3, 4, 8, 9, 13, 14 and 15 during our field work. In EP-1, 2, 3, 14, and 15 the ground water is anticipated to be actual regional ground water table for the area. This water table was encountered from about 3 to 9 feet below existing ground surface, depending upon the location of the pit, within the recessional sediments. In EP- 4, 8, 9 and 13 rapid ground water seepage was encountered at a depth of about 4 to 4Y, feet within the recessional or advance outwash sediments. With the exception of EP-4, these pits were all located on the slope area Seismic Hazards Generally, there are four types of potential geologic hazards associated with large seismic events: I) surficial ground rupture; 2) seismically induced landslides; 3) liquefaction; and 4) ground motion. The potential for each of these to impact the site is discussed below. No surficial faulting or earth rupture has been documented to date in this area of King County. The nearest known fault zones are a branch of the Seattle fault that is located more than IO miles to the north and a branch of the Tacoma fault that is located more than IO miles to the south. New studies are underway in the region in order to better understand and locate new faults, These studies may someday indicate the presence of a fault closer to the site than we currently know. Slopes on the project site, with the exceptions of several small areas of oversteepened slopes due to past cutting and filling, are generally quite moderate, on the order of 23 percent grade. Given the underlying geologic conditions, either very dense lodgement till or very granular sands and gravels, it is our opinion that the potential risk of damage to the site, by seismically induced landsliding, is low. The existing oversteepened areas that generally appear to be caused by past grading operations will be removed or significantly reduced by project grading. Future steep cuts will be supported by retaining structures. Liquefaction is the result of the loss of shear strength in soils when they are subjected to saturated conditions and seismic shaking. Typical soils that are susceptible are those that are saturated, poorly graded ( all one size), relatively fine-grained and in a loose condition. During a seismic event, severe shaking may cause liquefaction to occur and differential settlement may result. Based on the density and granular nature of the encountered sediments in the proposed building areas, it is our opinion that the risk of liquefaction is negligible and no mitigation is recommended. Based on the encountered stratigraphy, it is our opinion that any earthquake damage to the proposed structures, when founded on suitable foundation bearing strata in accordance with the recommendations provided in this report, would be caused by the intensity and acceleration associated with the event and not any of the above-discussed impacts. Design of the project 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155~1 I 06 206-417-7640 4 Plat of Fleuve des Voiles Geo/ogicaVGeotechnical Assessment Kent, King County, Washington should be consistent with 2003 International Building Code (IBC) guidelines. In accordance with the 2003 IBC, the following values should be used: Site Class C (Table 1615.1.1) Ss = 135% (Figure 1615.1.2[1]) S1 = 44% (Figure 1615.1.2[2]) Infiltration Potential In order to determine an approximate infiltration rate for the receptor soils, we utilized both the USDA Textural Triangle and gradation testing. Use of both methods allows correlation and a higher degree of confidence in the findings. Both of these methods are approved by Washington State Department of Ecology (Ecology) in their 2001 Manual. The design engineer should decide which method is most applicable for this project. The design engineer must also consider the depth to water table in the design. The depth to water table at the time of our field study was on the order of 9 feet below existing grade in the area of the proposed infiltration facilities. Our study was performed during the middle of winter and we do not anticipate that the water table will rise significantly over the remainder of the year. Based on laboratory analyses, and the USDA Textural Triangle, the receptor soils are classified as loamy sand with an estimated short-term infiltration rate, as per Table 3.7, of 2 inches/hour. The receptor soils were relatively homogenous in our exploration pits and borings except for a thin layer of denser, silty sand that was encountered in each exploration at a depth of approximately 7 feet. As per Table 3.7, a minimum correction factor of 2 must be used, thus providing an estimated long-term infiltration rate of 1.0 inches/hour. For actual design purposes, the design engineer should apply a further correction factor, if appropriate. Based on the ASTM gradation testing method, the D10 size for the sand samples tested ranged from .075 to 0.18mm with the higher values for soils on the southern portion of the site (south end of Tract 998 and Tract 995. As per Table 3.8, the estimated long-term infiltration rate for the receptor soils would range from 1.4 to 3.2 inches/hour. Again, an appropriate correction factor should be implemented by the design engineer. Copies of the sieve analyses are attached. Should a higher infiltration rate be necessary for design purposes, or if County code requires it, field infiltration testing would be necessary to determine the actual infiltration capacity of the receptor soils. Water table was encountered about 4 feet below the planned bottom of infiltration pond elevation (379.0). Therefore, the potential impact of ground water mounding should also be modeled. I953212lhAvenueNE Gary A. Flowers, PLLC. Shoreline, Washington 98155·1106 5 206417-7640 Plat of Fleuve des Voiles Geological/Geotechnica/ Assessment Kent, King County, Washington Within each of the exploration pits that was excavated in a planned infiltration pond area, i.e. EP- 3, EP-14 and EP-15, a single layer, or interbed, of siltier, higher density sediment was encountered above water table. This layer was encountered at a depth of 8 to 9 feet in EP-3, 66 to 77 inches in EP-14 and 78 to 84 inches in EP-15. This layer, if continuous throughout the infiltration facility, will have an adverse impact on the infiltration rate. As such, either the pond bottom must be below this layer or the layer must be thoroughly penetrated during construction of the facility. We recommend that the location and elevation of each of these three exploration pits be surveyed in order to provide a more exact elevation of the relatively impermeable layer and the water table. It is also important to understand that the design infiltration rate may be compromised if the contractor is not careful to avoid compaction or siltation of the receptor soils. Should either of these conditions occur, the receptor soils must be overexcavated and loosened and/or the upper 2 to 3 feet overexcavated and replaced to remove unwanted silt that has washed into the pond area. The pond must not be used as a silt contaimnent pond during construction. The infiltration rate can also be compromised if adequate pretreatment of the influent is not provided or if the facility is not properly maintained to remove any siltation or biomass buildup. CONCLUSIONS AND RECOMMENDATIONS Our exploration indicates that, from a geotechnical standpoint, the subject site is suitable for the proposed development provided the recommendations contained herein are properly followed. The slopes are relatively gentle and are generally underlain by dense, glacially consolidated sediments or coarse grained recessional or ice contact sediments that are considered stable at the slope inclinations encountered on the site. The encountered soils in the lower portions of the site are generally suitable for infiltration of storm water; however, due to the presence of some fine grained component in the receptor soils, and a relatively high water table, the usable infiltration rate will be quite low. Additional, in-situ testing may be necessary in order to ascertain the actual infiltration rate potential for the soils. Site Grading The site should be cleared of all existing structures, foundation elements and utilities. Vegetation, topsoil, forest duff and trees, that are not required as part of the landscape plan, should also be cleared and removed from the site. Permanent cut slopes on the project should not exceed a gradient of 2H: 1 V (horizontal to vertical). Slopes for the cells of the wet pond and for the infiltration pond should be excavated at gradients no steeper than 3H:l V. Temporary cuts may be steeper depending upon the encountered soils, generally lH:lV for the recessional outwash sediments and weathered 19532 12th Avenue NE Gary A. Flowers, PLLC Shoreline, Washington 98155-1106 6 206-417-7640 Plat of Fleuve des Voiles Geo/ogical/Geotechnical Assessment Kent, King County, Washington lodgement till and . 75H to .5H: 1 V for the glacially consolidated advance outwash sediments and unweathered lodgement till. In our opinion, stable construction slopes should be the responsibility of the contractor since they are on-site at all times, and should be determined during construction. The above slope angles are for areas where ground' water seepage is not encountered, and assumes that surface water is not allowed to flow across the temporary slope faces. If ground or surface water is present when the slopes are excavated, flatter slope angles may be required. As is typical with earthwork operations, some sloughing and raveling may occur and cut slopes may have to be adjusted in the field. In addition, WISHA/OSHA regulations should be followed at all times. Fully detailed grading plans were not available at the time this study was completed. As such, we are unsure whether any structural fill will be placed on the site. If structural fill is placed it must be compacted to a dense, nonyielding condition. Structural fill is defined as non-organic soil, acceptable to the engineering geologist, placed in maximum 8-inch loose lifts with each lift being compacted to at least 95 percent of the modified Proctor maximum density using ASTM:D 1557 as the standard. The top of all compacted fill should extend horizontally outward a minimum distance of 3 feet beyond the location of perimeter footings or pavement edges before sloping down at a maximum angle of 2H:1V. Structural fill placed in foundation excavations must extend a minimum distance of 2 feet beyond the edges of the footings. The recessional and advance outwash soils should generally be suitable for re-use as structural fill on the project. The till soils are much finer grained and moisture sensitive and will be more difficult to place except under ideal moisture conditions. All areas to be paved should be crowned or sloped to direct storm water flow to the edges of the roadway and parking areas. The subgrade should then be compacted to a dense and nonyielding condition (minimum 95 percent of the modified Proctor maximum density) with a minimum 20 ton vibratory roller. Prior to application of the pavement section the areas to be paved should be proofrolled with a fully loaded, tandem axle dump truck. Any soft or yielding areas identified during proofrolling should be overexcavated and backfilled with structural fill. Both the compaction of the subgrade and the proofroll should be witnessed and documented by a representative of this firm. Foundation Recommendations Shallow foundations may be used for support of the planned structures when placed on undisturbed or recompacted natural soils or approved structural fill placed atop these materials. An allowable soil bearing value of 2,000 psf may be used in the design of these footings, including both dead and live loads. An increase of one-third may be used for short-term wind or seismic loading. Perimeter footings for all proposed structures should be buried a minimum of 18 inches into the surrounding soil for frost protection. Settlement of footings for residences placed as detailed herein should be negligible. However, foundations placed on disturbed soil may result in increased settlement. All foundation excavations should be inspected by a Gary A. Flowers, PLLC. 19532121hAvenueNE Shoreline, Washington 98155-1106 206-417-7640 7 Plat of Fleuve des Voiles Geological/Geotechnica/ Assessment Kent, King County, Washington representative of this firm, prior to concrete placement, to verify that the design bearing capacity of the soils has been attained and that construction conforms to the recommendations contained in this report. The governing municipality may require such inspections. Lateral loads can be resisted by friction between the foundation and the supporting soils, and/or by passive earth pressure acting on the buried portions of the foundations. The foundations must be backfilled with structural fill compacted to at least 95 percent of ASTM:D 1557 to achieve the passive resistance provided below. The structural fill must extend horizontally outward from the embedded portion of the foundation a distance equal to at least three times the embedment depth over which the passive resistance is applied, We recommend the following design parameters. • Passive equivalent fluid= 300 pcf • Coefficient of friction= 0.30 The above values are allowable and include a factor of safety of at least 2.0. Floor Support Recommendations For concrete slab-on-grade floors, we recommend that the upper twelve (12) inches of natural soil beneath the slab be recompacted to a firm, unyielding condition with a density of at least 92 percent of the modified Proctor maximum density using ASTM:D 1557 as the standard. Any yielding areas should be overexcavated and filled with approved structural fill. For areas where moisture intrusion through the floor slab is undesirable, a minimum of 6 inches of pea gravel or very coarse, washed sand should be placed as a capillary break layer. If sand is used it must be compacted to at least 92 percent of the modified Proctor maximum density. A heavy duty (minimum IO mil) polyethylene plastic vapor barrier should be provided under the floor slab to prevent moisture vapor transmission through the slab. If the vapor barrier becomes compromised in any way during construction it should be replaced or an additional layer added. Retaining Walls Due to the sloping nature of the site we anticipate that multiple retaining walls will be required for development of this site. However, the location, type and height of the walls have not been ascertained at this time. Following are general design recommendations for any reinforced concrete walls that are planned. Retaining walls taller than 3 feet must be lined with a minimum of 12 inches of washed rock to within I foot of finish grade. The washed rock must tie into the footing drain for the wall footing. Retaining walls up to 8 feet high, that are free to rotate, may be designed for an active pressure of 35 pcf with level backfill or 50 pcf with sloping backfill. Additional surcharges such as traffic, other structures, or heavy equipment must be added to these design values. If any retaining walls taller than 8 feet are planned, we should be contacted to evaluate the walls and provide design recommendations. Gary A. Flowers, PLLC. 19532 12th Avenue NE Shoreline, Washington 98155-1106 206-417-7640 8 Plat of Fleuve des Voiles Geo/ogica//Geotechnico/ Assessment Kent, King County, Washington Rockeries At this time we are unsure if rockeries will be used during plat development. However, the following information is provided in the event that rockeries are planned. Rockeries should generally only be used to face, stable, free standing, natural soils. Rockeries that face fill slopes greater than 3 feet in height should not be used in place of retaining walls unless the backfill soil is suitably reinforced, especially where structures and roadways are adjacent to them. In all cases, structures and adjacent rockeries should be set back from rockeries so that a lH:IV (Horizontal:Vertical) line extending up from the rear base of the rockery does not contain a load from roadways, foundations, or other rockeries. It should also be noted that, although rockeries are commonly used, they should be considered a long-term maintenance item. The following notes should be used in the construction of the rockeries. A) The base of the rockery should be started by excavating a trench to a minimum depth of 12 inches below subgrade into firm, undisturbed native ground. If loose, soft, or disturbed materials exist at the base rock location, they should be removed and replaced with free-draining sand and gravel or crushed rock. B) The base excavation should extend out level from the front face of the rockery on native soil at least 2 feet before sloping down at a maximum 2H: 1 V slope. C) The base rock should have a minimum width (perpendicular to the line of the rockery) of 40 percent of the height of the rockery. All rocks should also meet the following weight requirements: Height of Rockery Above 5 feet 5 feet or less Minimum Weight of Rock 500/2200 pounds, graded, top/bottom rocks 500/1000 pounds, graded, top/bottom rocks D) The rock material should all be as nearly rectangular as possible. No stone should be used which does not extend through the wall. The rock material should be hard, sound, durable, and free from weathered portions, seams, cracks or other defects. The rock density should be a minimum of 160 pounds per cubic foot. E) Rock selection and placement should be such that there will be minimum voids and, in the exposed face of the wall, no open voids over 8 inches across in any direction. The rocks should be placed in a manner such that the longitudinal axis of the rock will be at right angles or perpendicular to the rockery face. Each rock should be placed so as to lock into two rocks in the lower tier. After setting each rock course, Gary A. Flowers, PLLC. 19532 12th Avenue NE Shoreline, Washington 98155~1106 206-417-7640 9 Plat of F/euve des Voiles Geo/ogical/Geotechnica/ Assessment Kent, King County, Washington all voids between the rocks should be chinked on the back with quarry rock to eliminate any void sufficient to pass a 2-inch-square probe. F) A drain consisting of rigid, perforated PVC pipe enclosed in a 12-inch-wide pea gravel trench should be placed behind the lower course of rock to remove water and prevent the buildup of hydrostatic pressure behind the rockery. The remainder of the rockery backfill should consist of quarry spalls with a maximum size of 4 inches and a minimum size of 2 inches. This material should be placed to a 12-inch-minimum thickness between the entire wall and the cut material. The backfill material should be placed in lifts to an elevation approximately 6 inches below the top of each course of rocks as they are placed, until the uppermost course is placed. Any backfill material falling onto the bearing surface of a rock course should be removed before the setting of the next course. G) Any asphalt paving should be sloped to drain away from the rockery. In addition, the areas above rockeries should be planted with grass as soon as possible after rockery construction, to reduce erosion. H) Where fill soils are required, and they are to be faced with rockeries greater than 3 feet in height, they should include the use of geogrid reinforcement. The reinforcement should extend from the back of the rock into the fill at least a distance equal to the height of the rockery. The horizontal spacing of the geogrid layers shall be a maximum of 2 feet and each layer shall be wrapped around the face of the succeeding layer a minimum distance of 4 feet. The soil behind the rockery shall be compacted to a firm and unyielding condition at or near the optimum moisture content of the soil. Pavement Subgrade Recommendations All areas to be paved should be crowned to direct storm water flow to the edges of the roadway and parking areas. The subgrade should then be compacted to a dense and nonyielding condition (minimum 95 percent of the modified Proctor maximum density) with a minimum 20 ton vibratory roller. Prior to placement of the pavement section the subgrade should be proofrolled with a fully loaded, tandem axle dump truck. Any soft or yielding areas identified during proofrolling should be overexcavated and backfilled with structural fill. Both the compaction of the subgrade and the proofroll should be witnessed and documented by a representative of this firm. In the case of utility trench backfill, the structural fill should be placed and compacted in accordance with current local or county codes and standards. The top of all compacted fill should extend horizontally outward a minimum distance of 3 feet beyond the pavement edges before sloping down at a maximum angle of 2H: 1 V. Gary A. Flowers, PLLC. 19532121:hAvenueNE Shoreline, Washington 98155-1106 206-417-7640 10 Plat of F/euve des Voiles Geologica//Geotechnica/ Assessment Kent, King County, Washington Site Drainage All perimeter footing walls should be provided with a drain at the footing level. Drains should consist of rigid, perforated, PVC pipe surrounded by washed pea gravel. The level of the perforations in the pipe should be set approximately 2 inches below the bottom of the footing at all locations, and the drains should be constructed with sufficient gradient to allow gravity discharge away from the building. Roof and surface runoff should not discharge into the footing drain system, but should be handled by a separate, rigid, tightline drain that discharges into an approved storm water conveyance system. In planning, exterior grades adjacent to walls should be sloped downward away from the structure to achieve surface drainage. Care should be taken to avoid any grading or construction of any berms or other structures that may cause storm water to flow under the pavement section. Water introduced under the pavement section could result in an unstable subgrade and future pavement failures. During construction there may be areas of subsurface water that are encountered as was done in exploration pits EP-4, EP-8, EP-9 and EP-13. Should this occur, it may be necessary to construct interceptor drains to control the water. One such location may be along the west property line of Lot 27. Due to the wetland located upslope of this lot, subsurface water at a shallow depth is likely and may be the source of water encountered in the exploration pits downslope of that location. The overall need for interceptor drains should be determined during plat development. Infiltration of storm water appears to be a feasible option for this site. Infiltration rates based on the 2001 Washington State Department of Ecology Storm Water Control Manual are provided above in the Infiltration Potential section. As per the manual, these rates generally are considered relatively conservative. If higher rates are needed for the project design. in-situ infiltration testing should be performed to confirm an actual design infiltration rate. Care must be taken during construction to avoid compaction of the soils in the infiltration pond area or to allow sediment laden water into the infiltration pond. Should either of these conditions occur, the design infiltration rate of the pond soils may be reduced unless corrective action, as discussed above, is provided. Erosion Control The sediments encountered on the upper portion of the subject site generally contain significant fines and are subject to erosion under both sheet flow and channelized flow regimes. The sediments encountered on the middle and lower portions of the project were coarser grained with lower erosion potential especially under sheet flow. Typical erosion control measures implemented on most construction sites will be suitable to mitigate the hazard of erosion on this site. This should include a silt fence around the low point of the cleared area, covering stockpiles with plastic and re-vegetating cleared areas as soon as possible after construction is completed. A rock mat at the construction entrance should be provided to reduce tracking of soils off of the 19532 12th Avenue NE Gary A. Flowers, PLLC Shoreline, Washington 98155-1106 11 206-417-7640 Plat of Fleuve des Voiles Kent, King County, Washington Geologica//Geotechnical Assessment site. Extra precautions should be taken to prevent any silt laden water from contaminating the soils in the areas of the proposed infiltration facilities. SUMMARY Based on our site reconnaissance and subsurface explorations the site appears to be suitable for the proposed development provided the recommendations given herein are properly implemented. We recommend that we be retained to review those portions of the plans and specifications that pertain to earthwork, foundations and infiltration to determine that they are consistent with the recommendations of this report. Construction monitoring and consultation services should also be provided to verify that subsurface conditions are as expected. Should conditions be revealed during construction that differs from the anticipated subsurface profile, we will evaluate those conditions and provide alternative recommendations where appropriate. Our findings and recommendations provided in this report were prepared in accordance with generally accepted principles of engineering geology and geotechnical engineering as practiced in the Puget Sound area at the time this report was submitted. We make no other warranty, either express or implied. Sincerely, Gary A. Flowers i'--.-~----- Gary A. Flowers, P.G., P.E.G. Engineering Geologist Attachments: Figure 1-Site & Exploration Plan Appendix A -Exploration Logs Appendix B -Laboratory Sieve Analyses 1953212th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 12 Robert M. Pride, P.E. Geotechnical Engineer 206-417-7640 I I ,' I !'' / I / ____ ;,__ r ; 9 /f' , , •'' / .: 'i i" ,,,. , '' ' •1 . r§ -'JJ .·· 0/ / '1 f . / . ,. '1 I JI f f "1 l'/!l. f:'.•1 ii/f,,,, -~-,I~ .l ~~:~ 1-I '_'_I 1 1 I · .. '! i -·· ·1, . 1 · , , I 1 :, , / ,11 1 # I: I ·; ' t: ,;-' :; //' !! !' I )id/I>!.>" ! I I LEGEND ,t· l EP-1 • Approximate location of exploration pit REFERENCE: TAYLOR ENGINEERING CONSULTANTS. GARY A. FLOWERS, PLLC SITE AND EXPLORATION PLAN PLAT OF FLEUVE DES VOILES KENT, KING COUNTY, WASHINGTON . ,. ·!; N A 0 80 SCALE IN FEET FIGURE 1 DATE 1105 PROJECT NO. GF05001 Plat of Fleuve des Voiles Geological!Geotechnical Assessment Kent, King County, Washington APPENDIX A EXPLORATION LOGS l9532 12th Avenue NE Gary A. Flowers, PLLC Shoreline, Washington 98 l 55-1106 206-417-7640 EXPLORATION PIT LOG Number EP-1 O~---------------------------- 1- 2 - - 3 - - 4 - 5 - - 6 - - 7 - - 8 - - 9 - - 10 - - 11 - - 12 - - 13 Forest duff/topsoil RECESSIONAL OUTWASH Loose becoming medium dense with depth, very moist to saturated, brown, medium-grained SAND with gravel and trace silt B0H@4' Moderate caving Ground water at 33 inches Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We wHI not accept responsibility for lhe use or interpretation by others of Information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 EXPLORATION PIT LOG Number EP-2 -Forest duff/topsoil - -RECESSIONAL OUTWASH - Loose becoming medium dense with depth, very moist to saturated, grayish-brown, -oxidized, medium-grained SAND with gravel and trace silt - - BOH@4' -No caving -Ground water at 32 inches - - - - - - - - - - - - - - - Subsurface conditions depicted represent our observa_tion at the lime and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-3 0----.------------------------------- Forest duff/brownish-black, sandy silt with organics (fill?) 1- - 2- - 3-RECESSIONAL OUTWASH -Medium dense, moist, grayish-brown, gravelly SAND with trace silt; gravels to 6" diameter 4- - 5- - 6- - 1- - 8-At 8'-9' and 11'-12' interbeds of dense, moist, grayish-brown, silty SAND with gravel g_ - 10- - 11 - - 12- - BOH@ 13' No caving; rapid ground water seepage at 10-1/2' 13 --L~~~~~~~~~~~~~~~~~~~~~~~~~~~--J Subsurface conditions depicted represent our observation al the time and location of this exploratory hole, modified by geologic interpretation, engineering analysls, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-4 0------r----------------------------, 1 2 3 4 5 6 7 8 9 10 11 12 13 - -- - - - - - - - - - - - - - - - - - - - - - - Forest duff/toosoil RECESSIONAL OUTWASH Medium dense, moist to saturated, grayish-brown, gravelly SAND to sandy GRAVEL with trace silt; gravel to 6" diameter BOH@B' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-5 Forest duff/toosoil ADVANCE OUTWASH Dense, moist, grayish-brown, gravelly SAND with trace silt BOH@4' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic Interpretation, engineering analysis, and judgment They are not necessarily representative of other limes and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - '---- - - - - - - - -- - - - EXPLORATION PIT LOG Number EP-6 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium stiff, moist, brown, sandy SILT with some gravel LODGEMENT TILL Very dense, moist, grayish-brown, silty SAND with some gravel ADVANCE OUTWASH Dense, moist, grayish-brown, gravelly SAND with trace silt BOH@7' No caving No ground water Subsurlace conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 EXPLORATION PIT LOG Number EP-7 -n Forest duff/topsoil FILL -Loose, moist, brown, silty SAND with some gravel - RELIC TOPSOIL LAYER - i Loose, moist, brownish-black, sandy SILT with organics - WEATHERED LODGEMENT TILL - Medium dense, moist, brown, sandy SILT with some gravel - - - - - - LODGEMENT TILL -Very dense, moist, brownish-gray, silty SAND with gravel BOH@ 7-1/2' -No caving -No ground water - - - ~ - - - - Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 i I EXPLORATION PIT LOG Number EP-8 0---,------------------------------- 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil RECESSIONAL OUTWASH Loose to medium dense, moist, brown SAND with some silt and gravel ADVANCE OUTWASH Dense, very moist to saturated, brownish-gray, gravelly SAND with trace silt BOH@5' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or Interpretation by others of infonnation presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-9 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel BOH@6' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of lnfonnation presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-10 0-,.-----------------------------, 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel BOH@6' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of infomiation presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-11 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel BOH@S' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis. and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or Interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-12 0--------,.----------------------------, 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel B0H@6' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will no! accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-13 Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, brown, silty SAND with gravel ADVANCE OUTWASH Dense to very dense, moist to wet, grayish-brown, sandy GRAVEL to gravelly SAND with trace silt; gravels to 12" diameter BOH@6' No caving Moderate ground water seepage at 55" Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC . Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 ' EXPLORATION PIT LOG Number EP-14 0------,.----------------------------, - 1 - - 2 - - 3 - - 4 - - 5 - ~ 6 - - 7 - - 8 - - 9 - - 10 - 11 - - 12- - Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, reddish-brown, silty SAND with some gravel Medium dense, moist to saturated, grayish-brown, gravelly SAND to sandy GRAVEL, trace silt At 66"-77" interbed of dense, grayish-brown silty SAND with some gravel BOH@ 10-1/2' No caving Moderate ground water seepage at 9' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretalion by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-15 O~-----------------------------, -Forest duff/topsoil 1--t-------------------------------------1 RECESSIONAL OUTWASH - 2-Medium dense, moist, reddish-brown, silty SAND with some gravel - 3-Medium dense, moist to saturated, grayish-brown, gravelly SAND with trace silt - 4- - 5- - 6- -At 78"-84" interbed of dense, grayish-brown, silty SAND with some gravel 7_ - 8- - 9_ - 10- - 11 - - 12- - BOH @ 13' Moderate caving below 9'; rapid ground water seepage at 9' 13_,, ______________________________ .., Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretafon, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - -~ - - - - EXPLORATION PIT LOG Number EP-16 Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, reddish-brown, silty SAND with some gravel Medium dense, moist, grayish-brown, gravelly SAND with trace silt B0H@5' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretaUon by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 Plat of Fleuve des Voiles Geological!Geotechnica/ Assessment Kent, King County, Washington APPENDIXB SIEVE ANALYSES Gary A. Flowers, PLLC. 19532 12th Avenue NE Shoreline, Washington 98155-1106 206-417-7640 I • ' , '' ' '" '" '" 100 \ . ,-~ 90 -~ ~ 80 ' ~ " 70 ' 60 ~ a -~ 50 ~ ~ 40 ~ --- 30 -- ~ ·--1--i----·· 20 ~ ~~ ,_ ---- IO --~ ·----- 0 100 10 Sample Number Deoth (ft 9075 Sieve90751 /27 /2005 Sieve Analysis Size opening in Inches I Number of Mesh per Inch, US Standard I '" ~ . " " "' "' " ,oo '"' - --·-~- ~ ' -~ - ~ ----~ --' ' I 0.1 Grain Siu (mm)-Corps of Engineers UnUonn Soll Classification Classification Nat. W.C. L.L. P.I. 0.01 .;,Ieve Ana1ys1s Specs• Sieve Size %Passing* min 2.00" 100 1.5011 88 l 84 3/4" 79 5/8 11 76 1/2" 72 3/8 11 64 l/4" 55 #4 50 #8 41 #10 39 #16 35 #30 29 #40 24 #50 19 #100 9 #200 5.5 Material: Brown ITTaveHv sand Source: EP-3, 6-8' Proiect: QC -Soos Creek Plat Project#: Q4025.filF 05001) Date Rec'd: ,......-J/24/()5 A:/ ) / /Li:_/" '..< ..-'l' ~ -r ,Y7 MA YES TESTING ENGINEERS '"We Maire a Dfflerance .. max Sieve Analvsis .:,teve Analysis I Size ~ning in lnchcs I Number of Mesh. per loch, US Standard I Specs* Sieve Size % Passing* min max JOO ' ' ' " ' .. '" = '" u " ,, ,. ~ '" .~ ,m -.. . ~ #10 100 90 . #16 89 80 ··--· -. #40 62 . .. #50 47 70 - § #100 24 ~ 60 0 . . #200 13.9 : 50 ~ 'if. 40 f-..--- ----- JO •.. --· ·-.. .• 20 . . . lO ·- 0 . JOO !O ' O.l 0.01 Grain Size (mm)* Corps or 11:ogillffn Unirorm Soil Cl.assifiallon Material: Brown gravelly sand Source: EP-3, 6-8' Samole Number Depth (ft Classification Nat. W.C. L.L. P.I. Proiect: QC-Soos Creek Plat 9075A Project#: 04025 (GFOSOOI\ Date Rec'd: ....-1114105,._ ) .,. ,,, / /2'/z,-~/ . ,,,.,.,.,. MA YES TESTING ENGINEERS Sieve9075A 1/27/2005 "'W"e Make • Difference• Sieve Analysis .,1eve Ana1ys1s I Size opening in Inches I Number of Mesh per lnch. US Standard I Specs • Sieve Size % Passing• min max ' ' ' '' ' '" '" .. '" .. ' " " " " " , .. ,00 2.00" 100 ,00 -1.50" 95 90 I 92 3/4" 92 ~ . 5/8" 90 .. RO ,_ -----··-1/2" 89 -----"' ,-..... 3/8" 86 70 ~ ·-1/4" 82 #4 79 .. ·--- 60 . #8 72 ' #10 70 ~ C -~ 50 ' #16 66 ~ #30 56 " ' #40 47 40 ' #50 36 .. .. #100 18 1-----~ -1~--~ ~ 30 ' #200 9.6 ' 20 ' ·-. ··~ ~·· ·~· ~ ~ ~ ·- ,0 0 lOO 10 l O.l 0.01 Grain Siu (mm) -Corps of Engineers Uniform Soil Cbsslflcatlon Material: Brown l!Tllvelly sand Source: EP·l4, 5-6' Samnle Number Depth (ft Classification Nat. W.C. L.L. P.I. Project: QC -Soos Creek Plat 9076 Project#: 04025 (GF 05001) Date Rec'd: ~/ ~ /.£.<~ --~ MAYES TESTING ENGINEERS Sieve90761/28/2005 "'W'• M'•h • DfffeN,nce• Sieve Analysis .:,1eve Analysis I Size opening in Inches I Number of Mesh per Inch, US Standard I Specs* . " ~ M ,M Sieve Size %Passing* min max 100 ' ' ' " ' .. '" "' '" ~ " ~ ,M ~ #10 100 90 #16 94 80 ... #40 67 -· 70 . #50 52 -~·· ~ 60 #100 26 ·! ~ #200 13.7 ::; 50 . ~ . . "$. 40 . -· 30 - 20 -.,. . ' 10 --· -- 0 l--· -- JOO 10 I 0.1 0.01 Grain Size (mm) -Corps of Engineers Uniform Soil Classificadon Material: Brown 2ravellv sand Source: EP-14' 5-6' Samo le Number Depth (ft) Classification Nat. W.C. LL. P.1. Prolect: QC-Soos Creek Plat 9076A Project#: 04025 (GF05001\ Date Rec'd: ~2005)- ~ /~ ,/ ~. .-- MAYES TESTING ENGINEERS Sieve9076A 1/28/2005 "'W"e Make a Difference• Sieve Analysis ~1eve Analysis I Size opening in Inches I Number ofMesh per Inch, US Standard I Specs* Sieve Size %Passing* min max ' ' ' ,., ' .. '" .. "' k ' " " "' " "' "' .. 2.00" 100 100 1.50" 100 . .~ I 91 90 .. ' 3/4" 84 .. 5/8" 80 80 ' 1/2" 74 - --1-r.;; ~-318" 70 70 114" 64 #4 61 ~· #8 54 60 ~ #10 53 ~ • . ~ . -#16 49 ::l 50 ~ ... . ~ #30 43 ~ --. -~-#40 37 40 ' #50 29 #100 16 . 30 #200 9.4 . ·- 20 -------· . .... ~ . . ~ IO ·-~ .. . ---- . 0 . 100 10 I O I O.ot Grain Size (mm) -Corps of Engineen Uni Corm Soil Classification I . Material: Brown oravel]y sand Source: EP-14, 8-9' Sample Number Depth (ft) Classification Nat. W.C. LL. P.l. Project: QC -Soos Creek Plat 9077 Proiect #: 04025 (GF 05001) Date Rec'd: '·-5 --,,,/// Y? MAYES TESTING ENGINEERS Sieve90771 /28/2005 '"We Maka • Difference"" Sieve Analvsls .:,Ieve Ana1ys1s I Size opelUllg in lnches I Number of Mesh per Inch, US Standard I Specs• Sieve Size % Passing* min max 100 & , , '-' ' ~!l '" m '" M ' '" " " '" -~ ,M = ---#IO JOO 90 ---#16 94 ----- 80 ---#40 70 --- 70 #50 55 ~ 60 -§ #100 31 C #200 17.9 .• [; 50 - ~ - '#. 40 ,_ --- 30 ---- 20 ,--- 10 _, _, - -I"'---,--+ -~-_, 0 - 100 10 I 0.1 0.01 Grain Siu (mm)· Corps or Enghieen Uniform Soil Classification Material: Brown gravelly sand Source: EP-14, 8-9' Sample Number Depth (ft) Classification Nat. W.C. L.L. P.L Project: QC-Soos Creek Plat 9077A Project#: Q4025 (GF05001) Date Rec'd: 1 ~ / / ~ -i1Z- MAYES TESTING ENGINEERS Sieve9077 A 1/28/2005 ~ Mab • Dlffarene4t• ~ • ·a ' IOO 1-- 90 1-· 80 70 60 ; so ~ "' 40 30 --· 20 I 2 1,5 ' .. 112 318 k ''- H-f-f- '- 1-1- --·-r-+ ··--i---+--· IO I I 11 J=t· +- 0 100 10 Sample NumberlDepth ff!ll 9078 Sieve9078112812005 Sieve Analysis Size opening in Inches Number of Mesh per Inch, US Standard 1/~ ,u . " " ,0 ., '° ,oo ,oo --· ,-. -" ...... .::,,. -" "" ·" -" -" _.., I 0.1 Grain Size (mm) -Corps of Engineers Uniform Soll C\assiflc.atlon Classification Nat. W.C. IL.L. P.l. I 11 I 1 ·-~- 0.01 :sieve Analysis Sieve Size o/a Passing* I ~pees* !lllll max 2.00" 100 1.50" 95 l 90 3/4" 85 5/81 ' 83 1/211 78 3/8" 73 1/4" 65 #4 61 #8 52 #10 50 #16 45 #30 36 #40 28 #50 19 #100 7 #200 3.3 Material: Brown gravelly sand Source: EP-15, 5-6' Project: QC -Soos Creek Plat Priiect #: Q4025 {GP 0500 I) Date Rec'd: &412005>::2 =· /~ Reviewed~: . / MA YES TESTING ENGINEERS '"We Make • Difference• -, -· Sieve Analvsis ~1eve Anruys1s I Size opening in lnches I Number of Mesh per Inch, US Standard I Specs* 100 ' ' ' " ' "' '" "' '" M ' '" " ~ '" M ,oo = Sieve Size % Passing* mm max #10 100 I----. . 90 . #16 89 . 80 #40 57 . 70 #50 39 . ~ 60 . #100 15 •.. . #200 6.6 50 .. 40 .. JO ,o .. ~ 10 . 0 ' 100 10 I 0.\ o.oi Grain Siu (mm). Corps of Engineers Uniform Soil Cl11ssinCJ1ilion Material: Brown i:rravellv sand Source: EP-15, 5-6' Sample Number Depth (ft Classification Nat. W.C. L.L. P.1. Proiect: QC-Soos Creek Plat 9078A Proiect #: 04025 (GF05001) Date Rec'd: l ·-,,.....-:7 /1 / /..£{JP -' Sieve9078A 1/28/2005 MAYES TESTING ENGINEERS -w'• Mak• • Difference .. Sieve Analysis i,,1eve Ana,ys1s I Size opening in Inches I Number of Mesh per loch, US Standard I Specs* Sieve Size % Passing* min max [00 4 ' ' '·' ' "' ·~ "' '" .. ' " " "' " " ,oo ,00 1.50" 100 ,- ~ -~ I 1/4 95 -I 90 90 - ~ ~ . 3/4" 81 ,o . --- ~-~ 5/8" 76 ' 1/2" 72 - 3/8" 67 70 - ·-" #4 55 - #8 46 60 r - ~ --#10 44 ., -· #16 39 ~ 50 ~ ~ ~ - ~ #40 26 40 ~ -#50 19 - #100 9 30 ~ -· #200 5.3 - 20 - ' 10 0 LOO IO l O.l 0.01 Guin Sile (mm)-Corps ofEoginurs Uniform Soil Classification Material: Brown sandy 21'avel Source: #15, 8-9' Sample Number Depth (ft Classification Nat. W.C. L.L. P.I. Project: OC-Soos Creek Plat 9079 Proiect #: Q4025 (GF05001\ Date Rec1d: ,.,,.,, noos .Y7 - / / .// Ii, -= /L ./ ./ C Sieve90791/28/2005 MA YES TESTING ENGINEERS "'We M•k• a Dlfferenc. .. Sieve Analvsls .:,Jeve Analysis I SU:e opening in Inches I NumberofMesh per Inch, US SW!dard I Specs* Sieve Size % Passinu* min max LOO ~ ' ' " ' '" '" = '" u ' rn •• " '" '" ,m --#10 100 90 -#16 89 80 ~ ~ ~ #40 59 . 70 I--#50 44 - ~ 60 #JOO 21 .; . #200 12.0 : 50 ~ ;_ 40 -· 30 20 -. IO -- . 0 JOO JO l 0.1 0,0\ Grain Size (mm) -Corps or Engineers Uniform Soil Classification Material: Brown <rravelly sand Source: #15, 8-9, Sample Number Depth (ft Classification Nat. W.C. LL. P.I. Project: QC-Soos Creek Plat 9079A Proiect #: 04025 (GFOSOO!) DateRec1d: 1/24/2005 ----/g~ ' - / MAYES TESTING ENGINEERS Sieve9079A 1/28/2005 '"W"• Maire • Difference• """"' -r ...l-. / ' ____ _J I \ _ _:_~[_I_ I 'i .J . -----,(,F ., ii ' ,1 i\ ii ,.. ;{ ~ J _[_ fj !ft· --:-,,. -- ~<-" :: re -j : .-- ~ .. .--io~•da'9"1oon,::ept.N6....,....>0~~ ---d~-_...-. ....i,.,.--........-. • llounoil.wy.~-----i,,,~ond---cn:l'-· -----~""'i--"°'* ___ _, _.,..-.. ... -....-... . . ~------l>c_...,.f._P'""'.,._ "'"l'i,.,_.,. .. ~-. Preliminary Plat Modification Exhibit t :-.... 1r . I r-, i SUMMIT HOMES RENTON PROPERTie WAJ.l-os2 -·-EJJ-·- fol2..N~ 1X,"f Al--S" -Sf:£. LJJA/3-ocog!-f-o EXHIBIT 1 F\v~ ~--~a. .. ~---------------------- --·-------____ -~-!:_5c,55 4 ciJ ________ _ • --------------·------------· ' . !;j ----· --------··-·---··------4+-------·-·-----------··-·. --------- ---·---· -·-----l~~ '-'>.a.±-. :;:,s ~ .. \ ~ -\""e-~-~--------·-----··----+~..C . __ L"-t"~ ... ~ --~en-__ ...Q...e.~ .. _ ~-~ --------------------- 1!1 ---------- ·-J_C'n_a..,cl_ +~---\.c:,c::. 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"'-c!:>"-<.J ___ re,e -1...~ ~ c,,,.. ~ o-{~l.:::, -~6~ o~·'·~ ~+ -f<:.~ .-. ,.1J.~ \i,e-\-~ &J .. t\.eeA. Co,\.o-e~. llwt.ct"<~c;e:,\-<----._~ ~-~~ .. :S0b-;-tk..-t 1'Z. I • _.. a>-Pf.s~ /v~o .. --c <\.,I\.~ .::,e..o,:,h__....,. ... --LeM--'-("l..3 ( u:,e.~ .:::c:.~. ~f. - !) :5~::::;. "'°~ ~..:)e:_ l~ ~cfue:1, • -. ~ "'-c:, ...... "'L c..a.:>~ ece __ 5E, {~~ ~ / '"'-ere! loc:> ~ Leeo ~ ~ C. ._.\ -\) -.5:Lc..-=, c::u,c::::. 1'.o+ ::::, \a ,--.c:lc:.A / c~+- ___ e~ be.cca,~.-1'~ "cs-\-~e~_">1....-c..-J . ' Charles A. Robinson (~224-8031 crobinson®karrtuttle.com. June 15, 2005 Ms. Kimberly Claussen KARR· TUTTLE•C A MPBEL L 1201 Third Avenue, Suite 2900, :Seattle, Washinp.Dn 98101 Tu~-(206) 2-23.-1U3. F~~il)682.7100 P<:rrtland Office 1212 Stsndud l'lau., IIOOS.W. Sixth~. Pmlimd.-. Oregwi 9.7204 Telep bone (503) 'l48-1aso. io,ct,imile (503) 222-4429 Pk-aee reply to Seattli: Office King County Dept. of Development & Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055 Re: Fleuve des Voiles. Application No. L04P0002 and Cogger Short Plat Dear Ms. Claussen K.C. D.D.E.S. We represent Charles W. Spaeth and certain entities controlled by hlJJi in connection with the acquisition and development of certain property located in King County. The property consists of the parcels with the following King County Assessor's tax parcel identification numbers: (i) 619900--0241; (ii) 619900--0260; (iii) 619900-0240; and (iv) 619900-0220. With respect to the parcel identified in (i) above, Mr. Spaeth currently holds a purchaser's interest in the property pursuant to a Purchase and Sale Agreement with the owner of the property. With respect to the parcels identified in (ii}, (iii} and {iv) above, a purchaser's interest in these properties is held by Soos Creek LLC pursuant to Purchase and Sale Agreements with the owners of the properties. The manager of Soos Creek LLC is Ravenna Development LLC, and the manager of Ravenna Development LLC is Mr. Spaeth. We have reviewed the Purchase and Sale Agreements for these four (4) parcels. By virtue of the right to purchase these parcels held by Charles W. Spaeth and by the entities which he controls, as well as the requirement of the owners of the parcels to cooperate with Mr. Spaeth in obtaining preliminary plat and/or short plat approval contained in the Agreements, Mr. #548448 vl 132774-003 June 15, 2005 Pagel Spaeth and his controlled entities possess the legal authority to enter into such agreements as may be required by King County or otherwise for the cooperative development of the parcels. If you require any additional information, please call Sin.:erely, (}{~~-~ Charles A. Robinson CAR:sf #3'18448 vl I 32'774.000 DEVELOPMENT AGREEMENT THIS DEVELOPMENT AGREEMENT (this "Agreement") is made this ~y of .::7i<n-L, 2005 by and between CHARLES W. SPAETH ("SPAETH") and SOOS CREEK LLC, a Washington limited liability company ("SOOS CREEK"). RECITALS A. Spaeth has the contractual right to purchase the real property with King County Assessor's tax parcel identification number 619900-0241 pursuant to the terms of a Pnrchase and Sale Agreement dated February 8, 2005 between Spaeth and the owner of the real property. B. Soos Creek has the contractual right to purchase the real property with King County Assessor's tax parcel identification numbers 0 6I9900-0260, 619900-0240 and 619900- 0220 pursuant to the terms of three separate Pnrchase and Sale Agreements dated February 16, 2004, October 20, 2003 and Januarj 17, 2004, wherein Soos Creek has been assigned the purchaser's interest in all three Agreements with the owners of the parcels. C. Spaeth and Soos Creek desire to provide for the coordinated development of all four (4) parcels, including the accommodation of the requirements of King County, Washington, as well as other governmental and non-governmental parties, for the issuance of any required and/or desired preliminary and final plat ajlproval and short plat approval. NOW, THEREFORE, in consideration of the mutual benefits to be derived from this Agreement, the parties agree as follows: 1. Spaeth and Soos Creek agree to cooperate in the development of the real property with King County Assessor's tax parcel identification numbers 619900-02441, 619900-0260, 619900-0240 and 619900-0220, including, but not limited to, complying with the requirements of King County, Washington, for the issuance of any required and/or desired preliminary and final plat approval and short plat approval for the parcels. The parties hereby contract with one another to grant cross-easements for access, utilities and otherwise, and the creation of such other burdens or obligations on one parcel or parcels for the benefit of another parcel or parcels. The parties have executed this Agreement effective as of the date written above. Aili.it.~~Cc+/~ SOOS CREEK LLC by Ravenna Development LLC its Manager y~~~ea~ w?~~ its Manager Ravenna Development LLC Charles Spaeth, Mana_ger 6839 Ravenna Ave. NE, Seattle, WA 98115 206-526-8481 I (fax) 206-526-5939 cshaffercorp@att.net June 23, 2005 Kimberly Claussen Department of Development and Environmental Services 900 Oakesdale Ave. SW Renton, WA 98055-1219 Re: Preliminary Plat-Rleuve des Voiles DDES File No. L04P0002 Dear Ms. Claussen, K.C. D.D.E.S. This cover letter is in res_ponse to your Plat Screening Transmittal memorandum (in Italics) for the Preliminary Plat Application of Soos Creek, LUSD File No. L04P0002, Date oflnformation Request-December 13, 2004. Our responses are in bold font. The changes inco111orated in these reports and the Conceptual Revised Preliminary Plat Plan are submitted at your request and were not initiated by the applicant. Herewith submitted are ten (10) copies of the following requested reports: Traffic Impact Analysis for Fleuve des Voiles prepared by William Popp Associates, traffic engineer, dated May 25, 2005 Preliminary Technical Information Report for Fleuve des Voiles and Cogger Plats,J)repared by Taylor Engineering Consultants (TEC), civil engineer, dated September 15, 2004 and revised May 13, 2005 Geological and Geotechnical Engineering Study, Plat ofFleuve des Voiles, prepared by Gary A. Flowers, PLLC, geotechnical consultant, dated February 14, 2005 Conceptual Wetland Mitigation Plan (including a Conceptual Significant Tree Retention Plan) prepared by Anthony Roth, AC Roth Environmental Services, biologist/environmental consultant, dated June 22, 2005 Twenty-five (25) copies of: The Revised Conceptual Preliminary Plat Map and Engineering Plans (6 sheets total) prepared by Taylor Engineering Consultants, civil engineer, dated September 15, 2004 and revised June 21, 2005. Page I of6 One (1) copy each of: Soos Creek Water and Sewer District Certificate of Water Availability and Certificate of Sewer Availability; and, as requested by DDES: Legal opinion letter. Charles A. Robinson, attorney-at-law, Karr-Tuttle-Campbell, June 15, 2005 together with Development Agreement. From LUSD File No. L04P0002 Information Request of December 13. 2004 Utilities I Sewer Line: The proposed construction of sewer line(s) through the wetland is not a permitted alteration under KCC 21A.24. Provide an alternative route or method of construction (i.e. boring) or submit for a reasonable use exception application (RUE) if this is proposed to be constructed by the developer or a PA UE if construction proposed by the utility district. Enclosed please fmd Water and Sewer Availability Certificates signed by Alice Marshall of the Soos Creek Water & Sewer District, dated June 17, 2005. Attached thereto is a June 17, 2005 letter signed by Alice Marshall setting forth the conditions pertaining to a future Developer Extension Agreement. Soos Creek Water and Sewer District (Soos Creek) has agreed to submit a P AUE for connection to the force sewer main east of the Fleuve des Voiles site. This connection is clearly marked on the District's "Proposed Sewer" map. The PAUE submittal would not occur until Soos Creek and the Developer enters into a Developer Extension Agreement. This does not normally occur until after the Preliminary Plat is approved and fmal engineering has begun. However, potential impacts and proposed mitigations of the sewer line construction are discussed in the Conceptual Wetland/ Buffer Mitigation Plan prepared by Anthony Roth of AC Roth Environmental Services. Wetland Mitigation Plan: Submit a plan prepared by a qualified biologist which identifies proposed buffer mitigation. See Conceptual Wetland Mitigation Plan prepared by Anthony Roth of AC Roth Environmental Services. Geotechnical Study: Provide an additional geotechnical study prepared and stamped by a qualified geotechnical engineer and/or an engineering geologist, licensed in the State of Washington. The study must include enough subsurface information regarding groundwater and soil conditions to perform a slope stability analysis. Is the site underlain by a significant layer of in-place till as indicated in the previous geotechnical report for this project or could there be some ice marginal deposits similar to those that appear to underlie landslides to the south along Soos Creek? It may be necessary to drill one or more deep borings in order to obtain the soil (type and strength) and groundwater conditions necessary to be able to perform this slope stability evaluation. In addition, the study/report must provide recommendations related to the construction of the roads, lots, rockeries, retaining wall and detention/ infiltration pond. Please contact Larry West at 206-206-7131 if you have further questions regarding the additional geotechnical information requested. See Geological and Geotechnical Engineering Study, Plat of Fleuve des Voiles prepared by Gary A. Flowers, PLLC; dated February 14, 2005. A total of sixteen exploration pits were Page2 of6 dug. (See pit logs.) "Our exploration indicates that, from a geotechnical standpoint, the subject site is suitable for the proposed development provided the recommendations contained herein are properly followed. The slopes are relatively gentle and are generally underlain by dense, glacially consolidated sediments or coarse-grained recessional or ice contact sediments that are considered stable at the slope inclinations encountered on the site." (Page 6) Conceptual Grading Plan: Provide a conceptual grading plan for the lots and roads and indicate areas of rockeries and/or proposed retaining walls and preliminary heights. Note, depending upon the height of proposed rockeries and walls, additional setbacks and/or review may be necessary. See Conceptual Grading and Drainage Plan (Sheet No. C-1) by Bill Taylor, TEC Engineering, Inc. Also, see Geological and Geotechnical Engineering Study by Gary A. Flowers: "Retaining Walls" [page 8) and "Rockeries" [page 9-10). Drainage: The following information must be prepared and stamped by a civil engineer licensed in the State of Washington. •:• Submit a geotechnical study performed by a geotechnical consultant which evaluates the feasibility of infiltration on the site. This study should include depth to seasonal high ground water through the winter season. Other options should be evaluated to determine if feasible (i.e. conventional stormwater detention). The Department is concerned that the proposed infiltration facility will not perform as indicated Please address these concerns (see attached 9/28/2004 comments from Steve Foley). Infiltration tests were apparently not taken where the infiltration facility is proposed. The stormwater facility should be designed with the appropriate safety factor and infiltration feasibility testing per the KCSWDM The conceptual drainage plan should be revised to incorporate any proposed revisions. See Geological and Geotechnical Engineering Study by Gary A. Flowers: "Infiltration of storm water appears to be a feasible option for this side." [page 11 ). See also Conceptual Grading and Drainage Plan, Sheet No. C-1. •:• A surface water adjustment from Core Requirement 1 is required to combine the onsite and access road subbasins. The site is within a split Level 2/Level 1 Flow Control area per KCSWDM If the proposed conceptual drainage plan reflects only Level 1 Flow Control, this aspect should be added to the adjustment request. Developer acknowledges that an adjustment will be required and that a letter requesting same will be forthcoming under separate cover. •:• Offeite upstream drainage enters the site along the west boundary. Include a mapping of the onsite subbasins and upstream offeite area tributary to the site. (per Section 2.3.1.] of the KCSWDM Task 1). Please revise the conceptual drainage plan to address the offeite flow, and provide provisions for conveyance and bypass of the offeite flows. See Cutoff Drain (TYP) shown on Conceptual Grading and Drainage Plan, Sheet C-1. Page 3 of6 •:• Please provide a Level One traffic impact analysis, prepared by a licensed engineer with expertise in traffic engineering, that expands the limited scope traffic analysis (turn lane and sight distance) assessment previously submitted. A Level One traffic impact analysis was submitted to DOES on September 16, 2004 (which was lost) and again in January 2005. Enclosed please find an updated (Level One) Traffic Impact Analysis for Fleuve des Voiles by William Popp Associates, Transportation Engineers/Planners, dated May 25, 2005. "An eastbound left turn late does not meet warrants for required installation. However, due to the fact the County CIP 401004 will construct a westbound left turn Jane, it is recommended that a short opposing eastbound left turn pocket be considered as part of the CIP for better design and safer operations." [page 15] · •:• Provide a conceptual (to scale) intersection improvement plan for the intersection of 124th Ave. SEISE 191"'1 Street, based upon an actual survey of pavement edges, proposed curb lines, channelization, etc. Demonstrate alignment of the proposed improvements with the existing improvements to the south on 124'h Ave. SE (b) provide a conceptual revision of either the north or south leg to eliminate any offiet, or (c) apply for and receive a variance to the KCRS for the construction centerline to construction centerline offiet. See Traffic Impact Analysis conclusions (page 13). Also see intersection detail on Sheet No. P-2. The conceptual intersection plan is the outgrowth of discussions between William Popp Jr. and Kristen Langley. The north leg of 124th Ave. SE will be improved on a half- street (30-foot) right of way with sidewalk on its west side. The easterly thirty feet is owned by the King County Parks Department. Thus the north leg of 1241 • Ave. SE will offset its south leg. The required variance application for this intersection plan will be forthcoming by separate cover. •!• Revise the plat plan to eliminate the angle point in the horizontal alignment of the proposed plat street and substitute a "low speed" horizontal curve per the KCRS. The Revision may result in other modifications and comments to the plat. This appears, at least, to result in the PAT's exceeding the+/-5 degree criteria/or centerline angle of perpendicularity. This issue is no longer relevant. The earlier proposed (SE 192 St & 124th Ave. SE) street alignment has been adjusted and this problem has been eliminated. See Sheet P-2. •!• Provide a preliminary centerline profile for the proposed plat street, west of 1241 h Ave. SE. See Preliminary Road and Utilities ProfiJes shown on Sheets C-3 and C-4. •!• Provide additional information, specifically curve date, for the centerline alignment of the overall plat street system: 1241h Ave. SE extension and SE 191 Ct. See Preliminary Plat Sheet No. P-2. Page 4 of6 Trees-S0-220: Provide a conceptual retention/replacement plan which addresses S0-220/KCC 21A.38.230-Significant Trees. See Conceptual Significant Tree Retention Plan (part of Conceptual Wetland Buffer Mitigation Plan) prepared by Anthony Roth, AC Roth Environmental Services. Revised Site Plan: Coordination ofFleuve des Voiles, Wehrman Plat, and Cogger Short Plat. On December 14, 2004 a preliminary plat application for the Wehrman property (Project No. L04P0027) was submitted to DDES. Ms. Claussen stated in her December 14, 2004 letter to Ravenna Development that "As a result ef this (Wehrman) submittal, please evaluate a road connection between the two proposed subdivisions, and revise the plat accordingly. It does not appear that a variance to the King Road Standards will be feasible for either proposal. " This letter: a) Directed Ravenna Development to connect its road system with the Wehrman property to allow for vehicular circulation between the two subdivisions. In a March 1, 2005 meeting with Ms. Claussen and Bruce Whittaker, Ms. Claussen and Mr. Whittaker told Charles Spaeth, representing Ravenna Development, that a road connection with the Wehrman property is required. Per your request, the new Fleuve des Voiles plat plan here submitted creates such a connection to the Wehrman property. Though the connection is paved, its purpose is to provide a convenient social connection between the two plats rather than encourage or accommodate through traffic. b) Stated that a variance to the road standards (required by the length of the road leading to the upper [westerly] cul-de-sac) would not be granted Charles Spaeth explained to Ms. Claussen and Mr. Whittaker at the March 1 meeting that an additional parcel of land contiguous with Fleuve des Voiles (the "Cogger" piece, generally south of, and east of a portion of Fleuve des Voiles) had become available for purchase and that he had entered into a contract to purchase it. Ms. Claussen and Mr. Whittaker stated that the Cogger parcel, if developed, would need to be (short) platted separately. They also stated that it would be desirable to loop the road by coordinating the Cogger road system with Fleuve des Voiles. At Ms. Claussen's and Mr. Whittaker's request, the new conceptual Fleuve des Voiles and Cogger plat plans coordinate to loop the road (Coordinated Plan) eliminating the two cul- de-sacs as well as the necessity for a variance that the long road leading to the westerly cul- de-sac would require. Eliminating the cul-de-sacs will also be favored by the fire department. This Coordinated Plan precludes the possibility of some other Cogger development plan, not coordinated with Fleuve des Voiles, generating traffic directly onto and from SE 192nd Street at a dangerous location given the sight-distance problems that section of SE 192nd Street poses. Page 5 of6 (The pre-application meeting for the Cogger short plat was held with Chad Tibbits was held May 31'1• The Cogger short plat application will be submitted shortly.) The conceptual Coordinated Plan contemplates the creation of three non-building tracts (Tracts H, I and J) immediately east of and adjacent to the Cogger property. The Cogger short plat also contemplates the creation of three non-building tracts (Tracts A, B and C), immediately adjacent to, west of, and corresponding to Tracts H, I and J. A boundary line adjustment (BLA) will incorporate Tracts H, I and J into the Cogger Short Plat, ultimately creating three buildable lots. The BLA will be executed following Preliminary Approval of the Fleuve des Voiles plat and the Cogger short plat. Coordinated Plan-"Development Agreement" Charles Spaeth possesses the contractual right to purchase all the properties involved in the Fleuve des Voiles/ Cogger Short Plat Coordinated Plan. He controls the Cogger property in his own name and the properties that comprise the Fleuve des Voiles project through Soos Creek Real Estate LLC and Ravenna Development LLC, its Manager, which Mr. Spaeth controls. He possesses the legal authority to coordinate the development of these two projects by creating a cross-easement agreement for access, utilities, etc. Attached, as requested by DOES, please fmd opinion letter by Charles A. Robinson of the law office of Karr-Tuttle-Campbell, dated June 15, 2005, together with attached "Development Agreement" creating the necessary cross easement agreement, executed on June 15, 2005. I again emphasize that the changes incorporated in the reports and the revised preliminary plat map and conceptual engineering plans here submitted were requested by you in your Request for Additional information, or verbally in the above-cited meetings, and were not initiated by the applicant. Thank-you for your attention to this submission. I may be reached at the mailing address, email address, and phone numbers above should you have any questions. Sincerely, ~enna Development LLC Crc~.lc~~ ~harles Spae~anager Enclosure Page 6 of6 Conceptual Wetland Mitigation Plan Plat of Fleuve de Voiles (L04P0002) King County, Washington June 22, 2005 KC. D.DES ~~"2.. AC ROTH ENVIRONMENTAL SERVICES 115N0RTH49™STREET • SEATTLE,WASHINGTON 981~ 206.784.4755 Conceptual Wetland Mitigation Plan Plat of Fleuve de Voiles (L04P0002) King County, Washington Prepared for: Ravenna Development LLC 6839 Ravenna Avenue NE Seattle, WA 98115 Prepared by: Anthony Roth June 22, 2005 AC ROTH ENVIRONMENTAL SERVICES 115NoRTH49"'STREET • SEATILE,WASHINGTON 98103 206.784.4755 Table of Contents Table of Contents Preface ........................................................................................... ii I. Introduction ................................................................................ I 2. Critical Areas Description ......................................................... 3 2.1 Overview ........................................................................... 3 2.2 Soos Creek Wetlands and Buffers .................................... 3 3. Project Impacts ......................................................................... .4 3.1 Soos Creek Wetland ......................................................... 4 3.2 Soos Creek Buffer.. ........................................................... 6 4. Conceptual Mitigation Measures ............................................... 7 4.1 Mitigation Overview ......................................................... 7 4. 2 Vegetation Replacement and Enhancement.. ................... 8 4.2.1 Construction Sequence ............................................ 8 4.2.2 Pre-Construction Meeting ........................................ 8 4.2.3 Implementation of the Planting Plan ....................... 8 4.2.4 Construction Observation ........................................ & 4.2.5 Post-Construction Activities .................................... 9 5. Monitoring Program .................................................................. 9 5. I Vegetation Establishment ................................................. 9 6. Maintenance Plan .................................................................... 10 7. Contingency Plan ..................................................................... 10 8. Perfonnance Security ............................................................... 10 9. Bibliography ............................................................................ 11 List of Figures I. Vicinity Map ..................................................................................... 1 2. Site Map ............................................................................................ 2 3. Conceptual Impact and Mitigation/Restoration Areas ..................... 5 List of Tables I. Wetland and Buffer Impact/ Conceptual Mitigation Summary ........ 4 2. Significant Tree Retention ................................................................ 6 Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) Preface Preface This report has been prepared for the use of Ravenna Development LLC and consultants associated with the project. In preparing this report, AC Roth Environmental Consultants (RES) has used site information and plat design from Taylor Engineering Consultants, as well as a Wetland Evaluation and Delineation Report (Heckert 2004, attached). Findings reported herein are as well based on information gathered in the field at the time of investigation by RES, RES's understanding of the 1997 Washington State Wetlands Identification and Delineation Manual (Ecology 1997), and RES' s understanding of federal, state and local regulations governing wetland and stream areas. The recommended buffers are RES's best professional opinion based on the circumstances and site conditions at the time of its study. The final required buffers and setbacks are subject to change by the appropriate federal, state, and local jurisdiction. Prior to preliminary and final design or any construction, all appropriate regulatory agencies should be contacted to verify the findings of this report, and to obtain appropriate approvals and permits. Water resource and buffer determinations are subject to professional judgment consistent with the standards of professional practice. No warrantee of use of this document is expressed or implied. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) ii Introduction 1. Introduction The subject property is a 7. 71 acre site located north of SE 192nd Street near its intersection with 124th Avenue SE, and west of Soos Creek in Section 33, Township 23 North, Range 5 East, W.M., King County, Washington (Figures I and 2). The applicant proposes a 39-lot single family residential subdivision, consistent with the RS-6 zoning of the property. The purpose of this report is to present a Conceptual Wetland and Buffer Mitigation Plan, consistent with those requirements of the King County Code (KCC) Section 21 A which were applicable at the October 1, 2004 project vesting. Any code references herein will be consistent with pre-2005 Critical Areas Regulations. 9ijotto Boeing Long acres Industrial .Pa!tl '" ~I. ,)' ·- "' ~ ' (, :,-,_;:,i :~0th '.~ ~ ·;; 1£--+:h ;~-'. S 196th St m s 208\h SI :'-!; ·>y:11.'' r' i Pt1nther L;o,:e Sf ;:-',·· ,, ::E ·:GC,tt>--?'.· ,, /'I SE :osth St '.3 E J '. L't•·, ;::.,._ ::E :: . .:. ~". ::- 0 531st tft.~l'!!s Figure 1 Vicinity Map Conceptual Wetland/Buffer Mitigation Plans Proposed Plat of Fleuve des Voiles (L04P0002) ~iseade,-Fairwood }~t~>:-. :,;;_ W."•d (\; :·,f>--;.;.,1 i)j @2004 NJI\VTEQ 1 •fa, .'-i-HO• nroum •t-< ~rT"U1'b ··zc:·::;; !. i ~ ,, 1"" ' l _,,,_ '· ' [!<> !. ,/ / \'" \ "' o I''~ ~-·~-----~---:-,;/ !"-* ·, ¥ \"" l l ,;)· ./' "-·->~: :, ' \ ' •, .;·1"'' \ ''h / ,-' ·, \ o 'm /.') -/ ~/ \ .\ ' p \ ;';/ .,.~ / 'i ;., ' -s",· A·,/,// ) ' ') . \'' ,, : ' ',/ ,,·/,~_ . ' t t ~-·t. -,·/· .. j \" \ ~ I.": ·\ \ \\\ . ?·, -,. , .. _ --~-~'., ,.., .. '.\.J ,: _o /·;: /"·_;.-·• ... ,\,.J_.<_ ' . '·,: ;·; >l>~;: .. / . 'I i .. ·,, C -h-'"fi> ·<i'N,11]1 \ . I 'I .\ . ,, ... ,, . ,.· • ·. ',. 'l>I \ f, ·t-J.f. ,, .... i;.-,;-,_ ,'; ' ..,. _ _..._ 'I _r,;. r·-.· r'--.--, .. \. l:.\ ' ,' ::,1 ~ ,. !.~-\1 \"' ' ,;~, ' . , ,· . ' ·11 }' ·~( .. . '·~...:- · ... ,; _, ..... :i'.;-. 5 E 192ND S7 Figure 2. Site Map (also see plans submitted concurrently) Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) r " ,, ~ ' ~ ~ h ' ;; .,,I ) i" \,, "' . 50, · \ SPJ ,,, l'' 101 SP~ l ~ ·-I SCALE Ii, H:I:: I ll'lii'~- 11111 ,o -.0 SO 7~ "'' Introduction 2 Critical Areas Description 2. Critical Areas Description 2.1 Overview A Palustrine scrub-shrub wetland less than 2,500 square feet (sf) in area occurs in the northwest comer of the site and extends off site into the property to the northwest (Heckert 2004 ); Heckert(2004) notes that this wetland is not regulated by King County. As described by Heckert (2004 ), the site is forested and dominated by Douglas fir and big leaf maple, with sub-dominants of western red cedar, western hemlock, and red alder. Some cottonwood is found at lower elevation. The Soos Creek wetlands occur to the east of the property, as delineated and described by Heckert (2004) and portrayed in submittal documents. 2.2 Soos Creek Wetlands and Buffers Heckert (2004) indicates that the vegetation in the immediately off site riparian wetland corridor associated with Soos Creek is a scrub-shrub community which has been subject to historic and ongoing human disturbance from powerline maintenance and installation of the Soos Creek Water and Sewer District (Sewer District) 8 inch sewer force main). Consistent with disturbed scrub-shrub areas, and based on a site visit in March 2005, the wetland vegetation adjacent to the instant proposal is dominated by a mix of Douglas spiraea, red-osier dogwood, and reed-canarygrass, with lesser constituents comprised of salmonberry, Sitka willow, slough sedge, buttercup, and willow-weed. Heckert (2004) cites that this wetland is a Class 1 wetland, under KCC Section 21A.06.1415. KCC 21A.24.320 requires a 100 foot (ft) buffer from Class I Wetlands. The westerly margins of the wetland buffer adjacent to the east side of the project is similarly impacted by human activity. This portion of the buffer is occupied by the northerly extension of the unopened right-of-way of 124th Avenue SE, now being used as the driveway to the existing offsite residence, plantings including non-native trees on the east side of the right-of-way, and lawn and shrubs on the west side of the right-of-way. Gravel has been placed on the driveway surface itself Northerly of the driveway, the right-of-way (including the wetland buffer) is dominated by Himalayan blackberry and has been subject to human disturbance. The remainder of the buffer to the east is a mix of scrub-shrub vegetation. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002J 3 Water Resources Evaluation 3. Project Impacts To provide sewer service, connection needs to be made from the proposed plat to Sewer District facilities in the Soos Creek wetlands. The trenching will also need to occur within a portion of the wetland buffer. Where such trenching is proposed in wetlands and buffers, conceptual plans are to place steel plates or equal measures on either side of a proposed 4-foot wide trench to limit equipment pressures and soil disturbance and reduce the impact to the critical areas. Past experience with this method (Love 2005) has demonstrated that protection of underlying vegetation and surface soil structure leads to rapid recovery of such protected areas. In addition, unavoidable road alignment will result in the loss of some wetland buffer. Table I summarizes proposed impacts and conceptual mitigation areas. Table 1. Wetland and Buffer Impact/Conceptual Mitigation Summary (areas in sf) Lost Excavated Plate Impact Restoration Enhancement Addition Road Construction · Buffer 2191 867 867 3408 676 Sewer Construction Wetland 356 838 1194 Buffer 857 945 1802 3.1 Soos Creek Wetland As discussed in Section 2.1 and shown on Figure 3, the Sewer District force main lies within the wetlands associated with Soos Creek. To provide for discharge of domestic wastewater from the plat, it will be necessary to construct an 8 inch gravity line which will extend into the Soos Creek wetland. The connection to the Sewer District system will require excavation of approximately 360 sf of wetland (Table I), with replacement of soils following installation. The impact from overlay of plating will be approximately 840 sf. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 4 - i.;-:: l' .l.J,j \ p I t-ff :'}~I-~-·~ ·-~--.-~/ -·_t.-Sp·--....... {_:/,>.-/,~\ '_' -·-"<s:,. :;>.:--::,,>; V<;.::.·/., ')-c --/-\{;_ '.~1·,j~> -c-v,, j l ' !- _J i \ ---~~);; - /;;/ _t"\.> -"t ;:/,/1--- ' 1 1-;J I: I . -r- -_{-i /j I . I ; l 'i j '1 -!; i J>' i: \ I ' I \ ' ' ' ' ' ' I I \ \ ' ' \ \ SP,1 \ I " I A' 2 \ \ \ \ \ ' ' \ \ ' ' ' \ '' ' ' ,, 'r' I Ja.a I ' I \::-\ I \'b' -fl, A1CI L'!:.\ . t':I \ r\ \ \ ' ' ' ' ' ' I \ I ' ' I , A'1 ' 1 1 I ;, \ \ ' -AA.!J,' ' ' I • AB \ \' I AA3/ ! AA2i ..:\ \ -AA 1', ' l1:i.:1 I \AD \ \ '\ ' ' ' ' ' ' I ' I ' I I \ I I I I I \ \ i \ \ \ I ' \ AS I I I I I , 'I '-.., __ I ' ' I j N I ~ \l~- ·,r•' I I ~\ _ __. .D..L L. 11,1 =-FE- Q 20 ,1C, 6'J 50 100 11111 11111 10 JO SC 70 90 Figure 3. Conceptual Impact and Mitigation/Restoration Areas Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) Water Resources Evaluation S[W~R [XT[~SJGN JvPA[T HITT ~ ffl!l ~ >r=-1 AN': 1·11:;IUl-{BANLI:: 356 '.::.F-- HL fi 4~-m (J'vTnLt..· liv1P4C1-:+ 838 '.::.F E,1Jrr[R OISTLW'l\t,.[',j[:-:- tb 7 S!- BUF-ER P:_ 1\ T H..;t-; OVTfll :_,. Y f ,..,1::.,t,.:~ i ~- '~L5 '.:::F R04C co~s~RiJCTION IVPACT {ZJ cli_jf-i-CH U1SS. 2 :19 ~ SF ~ Fll1HTT1 ~ITST JH~1H-lCf::, c!G7 SF CDr\CJ::T'l-l.lA~ MITIGA1ICJ~ 'v1E/,SluRES:•x f:'c--:J BJ,[R E:JHMl~f'MtNT_ 300~ D DU!T:R AODITlUl'l [.,"/Cj :if-- * Steel pln:r; o,~ e.=iu1v.:J~er1:. v,'lal Uc! ~_1J.:1c.,e:~; ~J1acent :o th~ s~w~r 7r(;~Ch ~c1 ·e:iu:. ~ rr ;:: 0 .: ;,:;,; Tr: nc.:-J1l11--::1 tc 1 1 r·2p}d,-_t'r1t;r1~" '-1· l t ·-.j 1 ,_11· !' 5 Water Resources Evaluation 3.2 Soos Creek Buffer As stated in Section 2.1, a significant portion of the 100 ft Soos Creek wetland buffer within the project boundaries is occupied by the right-of-way of 124th Avenue SE. To minimize unavoidable impacts to the onsite buffer, the road network turns just at the margin of the common boundary with the existing residence whose driveway overlays the right-of-way. As detailed in Figure 3 and Table I, the impact from establishment of a right-of-way extension for the new road network within the buffer will result in the permanent loss of approximately 2,190 sf of wetland buffer, and approximately 870 sf of buffer will be disturbedduring grading and road construction, but will be available for replanting restoration .. The proposed installation of the 8 inch gravity sewer to connect with the Sewer District facilities will result in the excavation of approximately 860 sf of buffer, with buffer impact from plate overlay of approximately 945 sf. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 6 Mitigation Measures 4. Conceptual Mitigation Measures 4.1 Mitigation Overview As compensation for the impacts identified in the previous section, the applicant proposes the following mitigation goals: I. Consistent with the provisions ofKCC 21A.24.330 and KCC 21A.24.340, as compensation for 2191 sf of proposed lost low-value buffer function due to proposed unavoidable impact from road construction: a. vegetation structural enhancement of approximately of 3,410 sf of low-value wetland buffer and I b. addition and enhancement of 676 sf oflow-value upland area adjacent to the entry road 2. Vegetational restoration of approximately 870 sf of low-value wetland buffer adjacent to the entJy road, disturbed during grading operations. 3. Consistent with KCC 21A.24.330.F, and KCC 2!A.24.340, replacement of approximately 360 sf of wetlands and 860 sf of wetland buffer proposed for unavoidable disturbance during needed sewer construction. 4. Enhancement of approximately 840 sf of wetlands and 945 sf of buffer subject to plate overlay during sewer installation. The specific performance standards necessary to achieve the mitigation goals will be: I. At least 80 percent of all planted trees, shrubs, and herbs in buffer mitigation areas will survive a 3-year monitoring period. 2. At least 80 percent of all planted shrubs and herbs in wetland restoration/enhancement areas will survive a 3-year monitoring period. 3. Allow no more than 10 percent cover of the mitigation/restoration areas with invasive, non-native species during the 3-year monitoring period. 4. In second and third year, thin volunteer red alder and cottonwood to 10-foot centers within mitigation/restoration areas. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 7 Mitigation Measures 4.2 Vegetation Replacement and Enhancement During preparation of a final mitigation plan, a planting plan will be prepared which identifies the species, numbers, and locations of plantings for the buffer enhancement and restoration associated with the road encroachment and the wetland and buffer replacement/enhancement associated with the sewer line installation. Highlights of the construction plan are provided below. 4.2.1 Construction Sequence Implementation of this mitigation plan will involve six tasks: (1) finalization of the mitigation plan; (2) pre-construction meeting; (3) staking of the construction area; (4) installation of temporary erosion control; (5) construction; and (6) post- construction meeting 4.2.2 Pre-Construction Meeting A pre-construction meeting will be held on-site with the project proponent, landscape contractor, invited County staff, and a project biologist to review the final plan and to discuss the project. This meeting will allow all involved parties to understand the intent and specifications of the mitigation project. 4.2.3 Implementation of the Planting Plan Any construction of sewer appurtenances will be completed and native soils restored from the surface to a depth of 18 inches prior to implementing the planting plan. The planting plan for restoration of wetland and buffer habitat replaces and enhances the biological habitat support functions lost from the proposed wetland and buffer impacts. To provide as much diversity and biological support as possible, plantings will include native trees, shrubs, and herbs that are common in area native uplands and wetlands. 4.2.4 Construction Observation A project biologist will review the site periodically during mitigation implementation. The purpose of construction observation is to provide assistance to the contractor and client for the interpretation and proper implementation of the plan. The responsibilities of the construction observer may include, but are not limited to: providing explanations of unique construction or planting techniques; review of construction materials and nursery stock; review of plant locations; review of grade slopes; and review of TESC measures. It will be the responsibility of the contractors to verify that plan specifications have been met and provide the project biologist with an as-built plan of the planting. Conceptual Wefland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 8 Monitoring Program 4.2.5 Post-Construction Activities After project installation, if the project is constructed per the final mitigation plan, a letter of compliance will be prepared by the project biologist for submittal to DDES. Should departures occur from the final mitigation plan, an as-built report will be submitted to ODES upon successful installation. Final plat approval will be subject to DOES inspection of the mitigation, subsequent to receipt of either the letter of compliance or as-built report. 5. Monitoring Program The objectives of the monitoring program over a three-year duration will be to assess restoration success in the wetland and buffer restoration areas. Results of all monitoring will be included in annual monitoring reports submitted to the attention of the appropriate staff at DDES by the end of each year. The monitoring results will be related to the performance standards and if warranted, recommendations for additional plantings, follow-on maintenance, and other measures will be made based on these findings. 5. 1 Vegetation Establishment The establishment and success of the mitigation plantings will be evaluated annually during the 3-year of the monitoring program. It is proposed that DDES technical staff(supported by payment on the part of the applicant) will meet the project biologist for a 30-minute to one hour joint site visit on an annual basis to evaluate success, compared to the Plan. Planting success in the mitigation areas will be evaluated by visual inspection and documented by photographs taken at static reference sites, to estimate the survivorship ratio for the mitigation site. Based on plant survival estimates compared to the as-built plans, tree and shrub percentage survival will be developed on the basis of consensus between DDES staff and the project biologist. A Letter of Consensus summarizing each annual joint site visit will serve as the annual monitoring report. The first-year monitoring will serve as the one-year warranty inspection. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 9 Maintenance Plan, Contingency Plan, and Performance Security 6. Maintenance Plan The landscape contractor or owner, under direction of the monitoring biologist, will perform maintenance within the mitigation areas. Required maintenance activities will include temporary irrigation of new plantings, trash removal from restoration/enhancement areas, repair or replacement of critical area signage, and ongoing weeding. At the end of the second and third years, volunteer red alder will be cleared to ten feet, on center, throughout the mitigation areas. Non-native invasive species will not be allowed to exceed ten percent within any of the mitigation/restoration areas. 7. Contingency Plan The contingency plan will provide for replacing plants that have failed to survive, so that the performance standards continue to be met during the monitoring period. If warranted, a recommendation will be made to replace dead plants, either in-kind or with alternative native species. The contingency plan will be enacted in whole, or in part, whenever the action is warranted by the monitoring reports. If the desired mitigation goals, as measured by the monitoring program and performance standards, are not achieved, then a joint determination by DDES and the project proponent could be made to implement the contingency plan. - 8. Performance Security During preparation of the final mitigation plan, a performance surety instrument will be developed and proposed for implementation to achieve project approval . Conceptual WeUand/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 10 9. Bibliography Cowardin, L.M., V. Carter, F.C. Golet and E.T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. Office of Biological Services, Fish and Wildlife Service, U.S. Dept. of the Interior, FWS/OBS-79/31. Love, P. 2005. Personal communication. Senior Planner. City of Mukilteo, Washington. February 3, 2005. Munsell xxxx. Soil Color Charts, Kollmorgan Instruments Corporation, Baltimore, Maryland. Phinney, L.A. and P. Bucknell. 1975. Catalog of Washington streams and salmon utilization. Volume 1, Washington Department of Fisheries, 1975. Reed, P., Jr. I 988. National list of plant species that occur in wetlands: Northwest (Region 9). U.S. Fish Wild!. Serv. Biol. Rep. 88(26.9). Reed, P., Jr., et al. 1993. 1993 Supplement to List of Plant Species that Occur in Wetlands: Northwest (Region 9). U.S. Dept. Interior Fish Wild!. Serv. December I 993 Washington State Department of Ecology. 1997. Washington State Wetlands Identification and Delineation Manual. Publication No. 96-94. March 1997. ______________ . 1993. Washington State Wetlands Rating System for Western Washington, Second Edition. Conceptual Welland/Buller Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 11 APPENDIX A WETLAND EVALUATION AND DELINEATION REPORT, SOOS CREEK PLAT PROJECT SITE H & S CONSUL TING, 2004 A· UI&~ 'Consulting WETLAND EVALUATION AND DELINEATION REPORT SOOS CREEK PLAT PROJECT SITE King County, Washington Section 33, Township 23 North, Range 5 East, W.M. prepared for Boston Design and Development 13425 E. Lk. Kathleen Dr. SE Renton, WA 98059 prepared by H & S Consulting P. 0. Box 731695 Puyallup, WA 98373 253 732-6515 mheckert@qwestnet May 26, 2004 • EXECUTIVE SUMMARY The Soos Creek Plat Project Site is approximately 7.26 acres in total size and located to the east of the City of Renton, King County, Washington. The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with single-family residences, managed and maintained lawns, and unmanaged portions. , Onsite assessment of the project site following the procedures outlined in the Washington State Wetlands Identification and Delineation Manual (Wash. Manual) and the Corps of Engineers Wetlands Delineation Manual (1987 Manual) resulted in the identification of two areas that exhibited hydric soils, wetland hydrology, and hydrophytic vegetation consistent with the established criteria of both the Wash. and 1987 Manuals. This assessment, completed in accordance with King County regulations, included an evaluation of the function and value rating for the identified wetlands, a classification of the wetland following the U.S. Fish and Wildlife methods, and an identification of the standard King County buffer width required for these wetlands. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsite -PFOE 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated reoulated ' •connotes wetland continues off-site PFOE palusbine, emergent, seasonally flooded PSSC palusbine, shrub-scrub, seasonally flooded/saturated The U.S. Army Corps of Engineers and King County, as well as a number of other local, state, and federal agencies, regulate activities in and around identified wetland and drainage corridor areas. Such regulations focus on the avoidance of adverse impacts to wetlands, streams, associated buffers and the mitigation of such impacts that cannot be avoided. King County has established criteria to categorize wetlands for purposes of regulation and the establishment of buffers. In addition, King County allows a limited amount of alterations to wetlands (i.e. isolated wetlands, roadway crossings) provided such impacts are mitigated pursuant to an approved mitigation plan. The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. • • I • TABLE OF CONTENTS INTRODUCTION ............................................................................................................. 1 STUDY PURPOSE ......................................................................................................... I SITE DESCRIPTION ..................................................................................................... I BACKGROUND INFORMATION ................................................................................ 2 NATIONAL WETLAND INVENTORY MAPPING .................................................... 2 STA TE OF WASHINGTON PRIORITY HABITATS AND SPECIES ....................... 2 STATE OF WASHINGTON STREAM CATALOG ..................................................... 2 KING COUNTY SENSITNE AREAS MAPPING ....................................................... 2 SOILS MAPPING .......................................................................................................... 2 ONSITE EVALUATION -WETLANDS ....................................................................... 3 WETLAND STUDY METHODS .................................................................................. 3 FIELD OBSERVATION ................................................................................................ 4 WETLAND AN'D STREAM DETERMIN"ATION ........................................................ 6 WETLAND FUNCTION AN'D VALUE ASSESSMENT ......................... , ................... 7 ONSITE WETLAND VALUATION ............................................................................. 8 REGULATORY CONSIDERATION ............................................................ ~ ............... 10 U.S. ARMY CORPS OF ENGINEERS -SECTION 404 ............................................... I 0 STATE OF WASHINGTON DEPARTMENT OF ECOLOGY .................................. I I KING COUNTY -"ENvIRONMENTALL Y SENSITIVE AREAS" ORDINANCE 21A.24 ...... 11 SELECTED ACTION PLAN ........................................................................................ 13 FIGUllES ...................•..•....•.•.....................................................•.•.......... _ ................ ~ ...... 14 REFERENCE LIST ........................................................................................................ 15 APPENDIX A·················-······-··············-········•••••••••······························••••••••••······· .. ····· 16 AITACHMENT 1 .......................................................................................................... 17 ' '•· Ill BACKGROUND INFORMATION STANDARD OF CARE Prior to extensive site planning, this document should be reviewed and the wetland boundaries verified by the appropriate resource and permitting agencies. Wetland boundaries, wetland classifications, wetland ratings, and all proposed wetland restoration and enhancement activities must be reviewed and approved by King County and potentially other regulatory staff. The above consultants have provided professional services that are in accordance with the degree of care and skill generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. The consultant is not responsible for design costs incurred before this document is approved by the appropriate resource and permitting agencies. Mark Heckert H & S Consulting INTRODUCTION This. report details the culmination of activities and onsite evaluations undertaken to complete both a wetlands evaluation and a wildlife habitats assessment as an element of the planning and site development of the Soos Creek Plat Project Site. The project area is approximately 7.26 acres in total size and generally located within a quickly urbanizing area east of the City of Renton, King County, Washington (Figure 1). The evaluation and delineation of onsite and adjacent wetlands and drainage corridors is a vital element in the planning and selection of a site development action. The goal of this approach is to assure that planned site platting does not result in adverse environmental impacts to such areas. Wetlands are generally defined as "those areas of King County that are inundated or saturated by ground or surface water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions." (King County Environmentally Sensitive Areas). STUDY PURPOSE This purpose of this document is to present the results of the onsite assessment and evaluation of the wetland/drainage corridor areas and the wildlife habitats within the project area. Included within this report is an assessment of the proposed impacts and compensatory actions to be taken to ensure that proposed onsite actions do not adversely impact environmentally sensitive areas. This study was designed to accommodate site planning and potential regulatory actions. This report is suitable for submittal to federal, state, and local authorities for wetland boundary verification and permitting actions. SITE DESCRIPTION The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with a single-family residence, managed and maintained lawns, and unmanaged portions. The forested portion of the site is dominated by a mixed forested plant community of mature Douglas fir (Pseudotsuga menziesi1) and mature big leaf maple (Acer macrophyllum). The project site is generally sloping to the east. There is a constructed ditch along the northwestern boundary of the site, to convey surface water from an adjacent development east down the slope. There is no evidence onsite of a continuous stream channel other than the ditch. 031103 Boston 12411 Ave. SE -1 BACKGROUND INFORMATION NATIONAL WETLAND INVENTORY MAPPING The National Wetland Inventory (NWI) mapping completed by the U.S. Fish and Wildlife . Service was reviewed as a part of this assessment. This mapping resource did not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as palustrine, forested, seasonally flooded (PFOC) Palustrine, Scrub- Shrub, Seasonally Flooded (PSSC), and palustrine, emergent, seasonally flooded (PEMC) (Figure 2). STATE OF WASHINGTON PRIORITY HABITATS AND SPECIES The State of Washington Priority Habitats and Species (PHS) Mapping was reviewed as a part of this assessment. This mapping resource identified Big Soos Creek within the immediate vicinity. STATE OF WASHINGTON STREAM CATALOG The State of Washington Stream Catalog for Puget Sound was reviewed as a part of this assessment. This mapping resource did not identify any streams within the project site. Offsite, adjacent to the east, a stream corridor was identified as Big Soos Creek. This creek was identified to provide habitat for resident and anadromous fish species. KING COUNTY SENSITIVE AREAS MAPPING The King County Wetland Inventory was reviewed as a part of this assessment This mapping resource did not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as Map Folio Wetland 5402, Class 1 (C), 134 acres. This resource also identified Big Soos Creek transecting the wetland as a Class 2S stream. · SOILS MAPPING A review of the mapping of soil types within the project area completed by the U.S. Soils Conservation Service (SCS) identified that the onsite soils consist primarily of Alderwood gravelly sandy loam (Soils Survey of King County Area Washington, Nov. 1973). This soil is described as: AgC -Alderwood gravelly sandy loam: This series consists of moderately well drained soils that have a weakly consolidated to strongly consolidated substratum at a depth of 24 to 40 inches. This soil is on uplands and formed in glacial deposits. A typical pedon of Alderwood soils from O -12 inches is dark brown (10YR 4/3) gravelly sandy loam. From 12 to 27 inches the soil is 031103 Boston 124"' Ave. SE· 2 Wetland Report grayish-brown (2.5YR 5/2) gravelly sandy loam with many medium, distinct mottles. This soil series is not listed as a hydric soil. ONSITE EVALUATION -WETLANDS WETLAND STUDY METHODS Presently accepted wetland identification is based on a three parameter criteria test as established within both the Corps of Engineers Wetlands Delineation Manual (1987 Manual) and the Washington State Wetlands Identification and Delineation Manual (Wash. Manual). These criteria are: 1. A predominance of hydrophytic vegetation. 2. The presence of hydric aoila, and ' 3. The presence of wetland hydrology. Initial onsite assessment and evaluation was completed during several site visits in 2003 and 2004. Specific identification of wetland boundaries was completed on December 17, 2003. Assessment transects were established on a north/south pattern through the project area. Wetland assessment within the project site followed the methods and procedures outlined in both the Wash. Manual and the 1987 Manual. Onsite assessment noted that there were no differences in the identified wetland boundaries as a result to using either the Wash. Manual or the 1987 Manual. Drainage corridors were assessed and identified in accordance with the criteria established by King County and the State of Washington Department of Natural Resources (WDNR) Forest Practice Rules (WAC 222-16-030). The site characteristics were assessed on April 2, 2004 with King county staff (N. Gillen) to confirm wetland categorization and discuss mitigation options. The boundary between wetland and non-wetland areas was established by examining the transitional gradient between wetland criteria along transects through the site. Delineation was performed using the routine methodology for areas greater than five acres as detailed in the 1987 Manual. Field data sheets are provided in Appendix A. Identified boundaries were marked in the field with number flagging. These boundaries were then surveyed and made a part of the site plan mapping. 031103 Boston 124" Ave. SE· 3 Wetland Report .. FIELD OBSERVATION • Vegetation The dominant onsite species was Douglas fir and big leaf maple. These mature trees formed open stands across the treed portion of the site. Additional tree species occurring onsite included Western red cedar (Thuja plicata), Western hemlock (Tsuga heterophyl/a), red alder (A/nus rubra), black cottonwood (Populus trichocarpa), cherry (Prunus spp), and cascara (Rhamnus purshiana). The understory included a wide variety of shrubs and herb species including· vine maple (Acer circinatum), salal (Gau/theria shallon), Oregon grape (Berberis spp.), hazelnut (Cory/us comuta), salmonberry (Rubus spectabilis), Scot's broom (Cytisus scoparius), Himalayan blackberry (Rubus procera), evergreen blackberry (Rubus /aciniatus), Pacific red elderberry (Sambusus racemosa), snowberry (Symphoricarpus a/bus), bracken fern (Pleridium aquilium), and sword fem (Po/ystichum munitum). Throughout the project site this plant community had been altered by prior management actions. This plant community was identified as non-hydrophytic (i.e. typical of non-wetlands). In the northwestern portion of the site, at the ·northwest corner, an isolated depression occurs. The plant community in this area is shrub-scrub, dominated by salmonberry, spiraea (Spiraea doug/asi1), slough sedge (Carex obnupta), buttercup (Ranunculus repens), reed canarygrass (Pha/aris arundinacea).. softrush, and lady fern (Athyrium filix-femina), with alder (A/nus rubra) saplings occurring intermittently. . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). Offsite to the east a large stream corridor occurs. The plant community in this area is shrub-scrub, dominated by red-osier dogwood (Comus stolonifera), spiraea (Spiraea douglasit), salmonberry, Sitka willow (Salix sitchensis), slough sedge (Carex obnupta), buttercup (Ranunculus repens), and willow-weed (Polygonum lapathifolium). . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). • Soils As identified by numerous sample plots throughout the project site,. the majority of the site exhibited a soil profile typical of the Alderwood soil series. The soil w,s defined as gravelly sandy loam with a soil matrix color of dark brown (10YR 3/3) to brown (10YR 4/4). These soils did not exhibit redoximorphic features such as prominent soil mottles, oxidized root channels, or glayed soil layers within the first 20 inches of soil depth. The majority of the project site exhibited soil which would not be considered "hydric." Representative sample plots are identified. (Special note -many more sample plots were completed during the field assessment than are reported within Appendix A). Sample plots within the defined isolated depression exhibited a mixed gravelly loam soil texture. These soils appeared to be mineral in character. Soils ranged in color from very dark brown (10YR 3/1) to dark grayish brown (10YR 4/2). Redoximorphic features 031103 Boston 124" Ave. SE· 4 Wetland Report were present and often very prominent. Soils within these areas exhibited "hydric" characteristics. • Hydrology Onsite hydrology appeared to be the result of seasonal stormwater runoff from onsite and adjacent properties. In addition, the pattern of surface water movement appeared to have been modified by prior land use activities. These activities have included the development of offsite homesites, the development of roadways and utilities, and the placement of culverts. The general movement of surface water runoff across the site was generally to the east. Surface water through the site was captured in boundary and roadside ditches which occur at the north and south boundaries of the site. Within the isolated depression, evidence of seasonal soil saturation was documented. This area was in a small depression, and had been impacted by prior land use actions (i.e. grazing, compaction, pasture management). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxid~ root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. This depression apparently drained to the ditch which flows east along the northern boundary of the site. Within the stream corridor area located offsite to the east of the site evidence of seasonal soil saturation was also documented. This area was part of a large wetland complex, and had been impacted by prior and on-going land use actions (i.e. utility corridor development). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. 031103 Boston 124" Ave. SE-5 WeUand Report WETLAND AND STREAM DETERMINATION Wetland determination was based on sample plots which contained hydrophytic vegetation, hydric soils, and wetland hydrology in accordance with the 1987 Manual and the Wash. Manual. Based on these methods two wetland areas were identified onsite (Attachment 1). No area was identified onsite to exhibit characters typical of a "stream" (i.e. a continuous pattern of surface water movement, either permanent or intermittent). Also one artta, noted to have been intentionally created in an upland area, captured residential runoff. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsite -PFOE 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated reaulated *connotes wetland continues off-site PFOE palustrine, emergent, seasonally flooded PSSC palustrine, shrub-scrub, seasonally flooded/saturated Wetland A: This wetland was identified within a large wetland/stream complex off-site to the east of the project site. This wetland was dominated by a shrub -scrub plant community adjacent to the project site, and was forested further away from the site. Th!s plant community was managed apparently to maintain the utility corridor access and maintenance road. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of topography. Wetland A was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as palustrine, shrub-scrub, seasonally flooded/saturated (PSSE). Based on the size of the wetland, association with a Class 2(8) stream, and the forested plant community this wetland complex was identified to meet the criteria for designation as a King County Class 1 Wetland. The standard buffer for a Class 1 Wetland is 100 ft. as measured perpendicular to the wetland edge. Wetland B: This wetland was identified within an isolated depression in the northwest comer of the project site. This wetland was dominated by a shrub-scrub plant community. This wetland was hydrologically supported by road and roof runoff conveyed by a ditch from an off-site single-family residence. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of topography and roof runoff. Wetland B was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as palustrine, scrub-shrub, seasonally flooded/saturated (PSSE). Based on the size of the wetland and the shrub-scrub plant community this wetland was 031103 Boston 12411 Ave. SE -6 WeUand Report identified to meet the criteria for designation as a King County Class 3 Wetland. However, since this wetland is smaller than 2,500 sq. ft. in total size, this wetland is apparently not regulated by King County. WETLAND FUNCTION AND VALUE ASSESSMENT Wetlands are known to perform significant roles in the ecosystem, some of which are of immediate value to society. These roles vary greatly with the size, type, hydrology, vegetation, and location of wetland areas. Although the ecological functions performed by this wetland are complex, interrelated, and difficult to assess and quantify, methods have been developed for the U.S. Army Corps of Engineers (Adamus et al. 1987: Reppert et al. 1979). The functions provided by wetlands include hydrologic support, shoreline protection, stormwater and floodwater storage, water quality, groundwater recharge, and provision of wildlife habitat. The HYDROLOGIC SUPPORT FUNCTION is defined by the measure of hydrologic stability and environmental integrity which the wetland provides. This function is measured by the frequency of inundation and saturation by tidal actions, stream flow, runoff, and pr~cipitation. Wetlands permanently inundated or saturated, or intertidal wetlands are valued as high. Medium valued wetlands are seasonally flooded or are open water systems that remain saturated during most of the growing season. Wetlands that are intermittently flooded or hydrologically isolated are considered of low value. The SHORELINE PROTECTION FUNCTION is defined by the measure of shielding from wave action, erosion, or storm damage which a wetland provides. This function is measured by the location and width of the wetland along shoreline areas, types of vegetation present, and the extent of development along the shoreline. A high value is given to wetlands along a shoreline that have a width greater than 200 yards and dense woody vegetation. A medium value is given to a wetland with a width of 100 to 200 yards, sparse woody vegetation, and dense emergent vegetation. Wetlands less than 100 yards in width and emergent or lacking vegetation are considered of low value. The STORMWATER AND FLOODWATER STORAGE FUNCTION is defined by the ability of a wetland to store water and retard flow during periods of flood or storm discharge. Wetlands of larger size are generally considered to have greater ability to provide this function. In addition, wetlands nearer to urban or potentially develop-able areas are also considered to provide greater flood · protections than wetlands which are in undeveloped areas. The WATER QUALITY FUNCTION is defined by the physical, biological, and chemical processes which wetlands provide to naturally purify water. This function removes organic and mineral particulates through natural filtration. In · general, wetlands of greater size, more denl:ie vegetation, and those which are 031103 Boston 12-4" Ave. SE -7 Wetland Report close to point sources of pollution are considered to be of higher value. Wetlands which are small (<5 acres), lacking dense vegetation, and not close to point or non-point sources of pollution are considered of low value. The GROUNDWATER RECHARGE FUNCTION is defined by the interaction of the underlying geology and soils, and the surface topography. This function provides for the movement of surface water into groundwater systems. Important to this function is wetland size, period of inundation, and depth of standing water within the wetland. High value is given to permanently inundated wetlands greater than 10 acres in size. Medium value is given to wetlands which are seasonally flooded and 5 to 10 acres is size. Wetlands less than 5 acres in size, isolated, and temporarily saturated are considered of low value. The NATURAL BIOLOGICAL FUNCTION is defined by the complexity of physical habitats and biological species within the wetland area. The value given to a wetland depends upon its ability to provide habitat for nesting (spawning), incubation, feeding, rearing, and cover of aquatic and terrestrial animal and fish species. In addition, the ability of a wetland to provide support for varying food chains is an important element in value assessment. Wetlands of high species diversity, three or more habitat JYpes, unique habitat features, large in size, and associated with a permanent stream or tidal marsh are considered of high value. Wetlands with moderate species diversity, two habitat types, moderate in size, and associated with an intermittent stream or high salt marsh are considered of medium value. A low value is given to wetlands of low species diversity, small size, and isolated. These six functions are rated low, moderate, or high, based on the criteria outlined above. These criteria are guidelines compiled from Adamus (1987) and Reppert (1979) and professional judgment must be exercised in assessing these criteria. Overall values for a wetland are assigned, based on a synthesis of individual values. In addition to intrinsic functions, extrinsic functions are also recognized. These extrinsic functions provide social values that have indirect benefits to wetlands. Education and recreational opportunities are most often mentioned as extrinsic functions. Associated values are often subjective and are thus difficult to evaluate. As such, these functions are not rated, but are nonetheless important when considering creation, restoration, or enhancement projects. ONSITE AND OFFSITE WETLAND VALUATION Following the function and value assessment process noted above Wetland A (Located offsite) was rated as exhibiting a High rating: • Water Quality Benefits -This wetland was part of a large complex associated with Big Soos Creek. This complex had been impacted by prior and on-going utility corridor land management. This wetland appeared to retain more than 50% of the runoff which occurred within the local area. This 031103 Boston 12411 Ave. SE· 8 WeUand Report wetland also exhibited a wide vegetation diversity. The primary water quality benefit provided by This wetland was a significant amount of biofiltration of surface stormwater. • Stormwater Storage -This wetland are part of a large wetland complex and had been impacted by prior land uses. These wetland was located in a rapidly developing part of King County. This wetland was large exhibited a substantial capacity to store stormwater. • Hydrologic Support -This wetland appeared large, and noted to pond a substantial amount of surface water throughout the growing season. Evidence of seasonal ponding.and saturation to the surface was significant. • Groundwater Recharge -This wetland appeared large, and to pond a significant amount of surface water throughout the growing season. Evidence of seasonal ponding and saturation to the surface was substantial. • Natural Biological Function -This wetland was large, and exhibited an extensive range of plant diversity and vegetation complexity. Unique habitat · features (i.e. snags, fallfin trees, mature trees along the wetland boundary) were limited adjacent to the project site. Following the function and value assessment process noted above Wetland B were rated as exhibiting a low rating: • Water Quality Benefits -This wetland was small and had been impacted by prior grazing and pasture and land management. This wetland appeared to retain less than 25% of the runoff which occurred within the local area. This wetland also exhibited a limited vegetation diversity as a result of prior grazing and land use. The primary water quality benefit provided by This wetland was a very limited amount of biofiltration of surface stormwater. • Stormwater Storage • This wetland appeared within a topographic depression and had been impacted by prior land uses. T.his wetland was located in a rapidly developing part of King County. This w~tland was small and exhibited a very limited ability to store stormwater. • Hydrologic Support -This wetland appeared small, and noted to pond a limited amount of surface water early in the growing season. . Evidence of seasonal ponding and saturation to the surface was limited. • Groundwater Recharge -This wetland appeared small, and to pond a limited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surface was limited. 031103 Boston 124111 Ave. SE-9 Wedend Report • Natural Biological Function -This wetland was small, and exhibited a very limited range of plant diversity and vegetation complexity. Unique habitat features (i.e. snags, fallen trees, mature trees along the wetland boundary) were absent. ' REGULA TORY CONSIDERATION The proposed alteration of lands defined by various federal, state, and local authority rules and regulations as "wetlands" raises environmental concerns that are generally addressed in the development review process. These concerns center around the development's potential adverse impacts to the structure, function, value, and size of these ''wetland" areas. Such adverse impacts may include a reduction in wildlife habitats, reduced surface water quality, reduced water retention, a reduced ground water recharge rate, reduced plant species diversity, and the reduction in the function and value of other associated wetland and non-wetland characteristics. U.S. ARMY CORPS OF ENGINEERS -Section 404 Section 404 of the Clean Water Act (33 U.S.C. 1344) prohibits the discharge of dredged or fill material into 'Waters of'the United States" without a permit from the Corps of Engineers (Corps). The Corps has jurisdiction over freshwater systems waterward from the ordinary high water line of a water body or waterward from the upland boundary of the adjacent wetland. The definition of fill materials includes the replacement of aquatic areas with dry land, grading which changes the surface contour of a wetland, and mechanized land clearing in wetlands. For the purposes of Section 404 permitting the Corps makes the final determination as to whether an area meets the wetland definition and would be subject to regulation under the Corps program. Currently the Corps has two specific types of permits which apply to wetland fill proposals. These two types are a series of specific Nationwide Permits and the Individual Permit The Nationwide Permit process identifies specific categories of work that can be undertaken following a set of specific conditions applicable to each Nationwide Permit number. For example; NWP#12 allows for the limited, short term impacts to wetlands for the placement of utilities, and NWP#14 allows for a limited impact to wetlands as a part of the development of a roadway crossing. The Corps has · noted several times within information papers, documents, and workshops that a project proponent that places fill within a wetland without specific Corps authorization does so at the proponent's own risk. The Corps requires an Individual Permit where a proposed activities within an identified jurisdictional wetland area can not be authorized under one of the Nationwide Permits. Within the Individual Permit process the Corps undertakes a much more in- depth review of the proposed project and the proposed impacts. The Corps must evaluate whether the benefits derived from the project outweigh the foreseeable environmental impacts of the project's completion. 031103 Boston 12411 Ave. SE -10 Wetland Report STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Proposed action undertaken through either of the Corps of Engineers processes (Nationwide, Individual, or isolated) are also subject to the provisions of the Washington State Department of Ecology Water Quality Certification Process. Projects that may be exempt from Corps of Engineers Section 404 jurisdiction may still require review by the Washington State Department of Ecology to ensure consistency with State water quality protection provisions. KING COUNTY -"Environmentally Sensitive Areas" Ordinance 21A.24 • Wetland and Stream Classes King County regulates activ~ies in and around wetland areas. Such regulations also require that an undisturbed native vegetation buffer be retained along the upland side of the identified wetland areas. To assist in this regulation the County has defined classes by which to regulate wetlands, streams, and their associated buffer area. These categories are based on such features as size; the presence of endangered or threatened plants, f1Sh, Qr animals; regionally rare wetlands; wetlands of local significance for wildlife or stormwater functions; the number of wetland classes and subclasses; and percentage of open water. A Class 1 Wetland means a wetland assigned the Unique/Outstanding rating in the King County Wetlands Inventory, or any wetland which meets any of the following criteria: 1. The presence of species listed by the federal government or state as endangered, or threatened, or the presence of critical or outstanding actual habitat for those species; 2. Wetlands having 40% to 60% permanent open water in dispersed patches with two or more classes of vegetation; 3. Wetlands equal to or greater than ten acres in size and having three or more wetland classes, one of which is open water; or 4. The presence of plant associations of infrequent occurrence. A Class 2 Wetland means a wetland assigned the Significant #2 Rating in the King County Wetlands Inventory; or any wetlands which meet any of the following criteria: 1. Wetlands greater that one acre in size; 2. Wetlands equal to or less that one acre in size and having three or more wetland classes; 3. Wetlands equal to or less than one acre that have a forested wetland class; 4. The presence of heron rookeries or raptor nesting trees. 031103 Boston 12411 Ave. SE-11 Wetland Report A Class 3 Wetland means a wetland assigned a Lesser Concern #3 Rating in the King County Wetlands Inventory, 1983, or uninventoried wetlands that area equal to or less than one acre in size and that have two or fewer wetland classes. King County does not regulate wetlands less than 2,500 square feet in total size within the Urban Growth Boundary of King County. King county defines "Streams" as those areas in King County where surface waters produce a defined channel or bed, not including irrigation ditches, canals, storm or surface water run-off devices or other entirely artificial watercourses, unless they are used by salmonids or are used to convey streams naturally occurring prior to construction in such watercourses. • Required Buffers King County has established a standard buffer to be applied to a wetland or stream to assure protection of the wetland function and value. This buffer area is measured perpendicular to the defined wetland edge or perpendicular to the identified ordinary high water mark of a stream. WETLAND STANDARD BUFFER CLASS WIDTH 1 100 feet 2 50 feet 3 25feet King County allows the standard buffer to be modified where such actions would provide additional protection to wetlands or enhance the wetland's functions (21A.24.320.B). Buffer averaging may be allowed as long as the total area contained in the buffer on the development proposal site does not decrease and the minimum width of the final buffer is not less than 65% of the standard buffer width. 031103 Boston 12411 Ave. SE-12 WeUand Report SELECTED ACTION PLAN The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. A primary feature in the creation of these homesite lots will be the establishment of a protective buffer adjacent to the identified offsite wetland consistent with the King County Environmental Sensitive Areas Ordinance. Wetland B will be filled in accordance with King County regulation. Preliminary development and mitigation plans are submitted by the Owner (Boston Design & Development) as an attachment to this report. 031103 Boston 12411 Ave. SE -13 Wetland Report I .J ' .; I ! FIGURES 031103 Boston 12411 Ave. SE -14 Wetland Report I· u,.,, OJ01 ol'• Wl~ 0~ Jf..\ Ql.) ' 0,.40 0~80 mio l!!&l:H.5.T -. 022, om oou (11()1 0011 0210 = 012· """' OU2 woo OOlf o·vJ I Ol-1!> 00>• Ol.41 0244 o..!4.2 ., 00><> !!!I 00<!() ,(; -, (llil(; i 01:16 01,;u p 0~2!1, <>JOO 0~4~ Q!,tz O~,IM) 0210 0440 ·11 0320 0~43 01111>~ OD.> = &j (2!84 ~~1,tl,] " 02,11 -., OloJ 03'11 Ol40 0100 :; '1215 01tif 1""" &£.IHNIU:C •• oo,o/ -,1 ill, W'ti 0020 0030 ~o,so C<.\26 00,!, ;; 0016 CC•3~ -,1 0010 1 + 001> 0000 0110 -,1 00>6 """" ..-:, tcJ-"iotC.."r I -11 1 Legend -•1 ~ Selilclad Faah.ues C1.-i.1 ,w SUVet1 c~ 2 ;ta.en,.., Pan;al ti Ci.m.!'2!i.11'll01d -•1 ti Filih and Dloh ,w c-, Wi<ffle No1""rk .. iJng~'icd SAO Stream tm SAOW..U.nd -11 \WT.t o~o· Ql6() ~ C(.vll t.\'.«12 CX:"1' ""'" 00,,!, !,iQl,J ll/ !I! ... :zi t 9024 p """" ~2~ 0014 ..,,. 0 N w Figure 1. Site Vicinity And King County Wetlands Map E Soos Creek Plat • I • 49.a. • • /\ • • PUB • • • • • • • , . • 0.06 0 0.06 0.12 MIies /~/ Renton nwi :enton nwi PEMC PEMF PFOC ~PSSC w N E s Figure 2. Soos Creek Plat NWJ Map I REFERENCE LIST Adamus, P.R., E.J. Clairain Jr., R.D. Smith, and R.E. Young. 1987. Wetland Evaluation Technique (WET); Volume II: Methodology, Operational Draft Technical Report Y-87, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Office of Biological Services, U.S. Fish and Wildlife Service, U.S. Department of the Interior, FWS/OBS-79/31. Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1, US army Engineer Waterways Experiment Station, Vicksburg, Miss. · Hitchcock, C.L., A. Cronquist. 1977. Flora of the Pacific Northwest. University of Washington Press. Seattle, Washington. Horner, R.R. and K.J. Raedeke. 1989. Guide for Wetland Mitigation Project Monitoring. Washington State Department of Transportation. contract number GC8286, task 6. King County Department of Natural Resources. 1993. DRAFT Wildlife Management in King County: Issue Paper. Mikol, S.A. 1980. Field Guidelines for Using Transects to Sample Nongame Bird Populations. U.S. Fish and Wildlife Service publication FWS/OBS -80/58. Reppert, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Meyers. 1979. Wetland Values -Concepts and Methods for Wetland Evaluation. Research Report 79-R1, U.S. Army Corps of Engineers, Institute for Water Resources, Fort Belvoir, Virginia. U.S. Department of Agriculture, Soils Conservation Service. Soils Survey of King County Area Washington, Nov. 1973. Washington State Department of Ecology. 1997. Washington State Wetlands . Identification and Delineation Manual. Publication Number 96-94. Washington State Department of Fisheries, Catalog of Washington Streams and Salmon Utilization, Volume 1., 1975 031103 Boston 12411 Ave. SE· 15 WeUand Report APPENDIX A FIELD DATA FORMS 031103 Boston 12411 Ave. SE-16 Wetland Report Data Fonn Routine Wetland Detannlnation Projec;t/Site: Boaton 124th Ava. SE Job Number: 031103 City: none Wetland Data Point SP 1 Applicant/Owrnlr: Boaton Detl11n & Devalopm9111 Co. Investigator: M. Heckert Date: December 17, 2003 County: King State: Wa (Xl Do nonnal clrcumatances exist on the aite? [ J Have vegetation, aoila, or hydrology been disturbed? Community ID: Forni Station ID: [ ] Is the area a potenllal problem area? Vegetation Dominant Species HflbaCfQU§ X Phaleria IWlidlnacea ~ Oami.tia ceraaifonn;s X Rubus annenla(]us Common Name Grass.Reed Canary Indian Plum Blackberry ,Himalaya Plot ID: % Cover Indicator 50 25 50 FAO/V FACU FACU Im x A/nus robnl Alder.Red 66 FAC Cowan:lin Clasalflcation: % Species that are OBL, FACW, or FAC(except FAC-): 50 Remitrks appears to drain well Hydrology ( l Recorded Data (deacribe in remarks) ( ] Slleam, Lake, or Tide Gage [ J AartaJ Photograph [ ] Other (descnbe In rernlllks) Field Obaenlalions; Depth of Surface Watef(in.): O Depth to Free Water In Pit(in.): >24 Depth to Saturated Soils(in.): >24 Remarks appears to drain well Soils Pl1m8ry WeUand Hy<ltology lnd/calora [ ] Inundated [ ] Saturated In upper 12 inohes [ ] Water marks [ l Drift u,- 1 l SedimentdepositS I ] Drainage patterns in wetlands Secondary Hyrlrology Indicators I ] Oxidized root channels I l Water .. tained leaves [ ] Local aoil survey data I J F~utral test [ J Other (explain in remarks) Depth Hor. (in.) Matrix Color Mollie / 2nd Mottle Texture, Structure. etc. Color Abundance Contrast o.e A 10YR 312 10YR3/3 6-18 B H}'l1tic Soils Indicators [ I Histoaol [ ] Hillie Epipedon [ I Suffidic Odor I l Probable Aquatic Moist Regime [ l Reducing Conditions [ J Gleyed or Low-Chroma Colors Unit Name: Drainage Class: Remarks appears to drain •II Wetland Detanntn,tion [ ) Hydrophytic Vegetation PrN8111 [ ) Hydric Soila Present [ J WaUand Hydrology Preeent Remarks fill welland criteria NOT met appears to drain well [ J Concretions Coarse Sandy Loam stones Coarse Sandy Loam stones [ I High Organic % in Surface Layer I J Organic Slleaking [ J Listed on Local Hydric Soils List [ ) Listed on Nallonel Hydric Soila List [ I Other (explain in remlllks) Taxonomy: [ J Field Observations mat,;/\ map [ J This Data Point ia a Wetland Paoe 1 of 10 Data Fonn Routine Wetland Detennlnation Project/Site: ao.ton 124111 Ave. SE Applic:anl/Owner: Bolton Dealgn • Development Co. lnveatJuator: M. HKurt [XJ Do nonnal clrcumllancea exill on the Ille? [ I Have vegetalion, ooila, or h~rology been disturbed? [ ] Is the area a potential problem area? Vegetation Dominant SetclN Common Name ttemes,pys Job Number. 031103 City: none Wetland Data Point SP 2 Date: December 17, 2003 County: King State: wa Corrvnunily ID: Station ID: Plot ID: X Phalait& anmd/naclla Grna,Reed Canary 90 FACW .ilf'I Rubus specllbl/ls Berry,Salmon 25 FAC X Spnea douglas// Spiraea.Douglas' 25 FACW % Species that are OBL. FACW, or FAC (except FAC-): 100 Rem8lka Cowardin Claaslficatlon: pua appears to drain poorly Hydrology [ J ~ Data (daeaibe in remarl<s) [ J Sltellm, Lake, or Tide Gage [ l Aertal Photograph [ J Other (describe in remalk&) Field Observations: Depth of Surface Water(ln.): o Depth to F11111 Water in Pll(in.): 12 Depth to Saturated Solla(in.): 12 Rernarl<s appears to drain poorly Pr1maty Welland Hyc/lD/ogy Indicators [ ] Inundated [XI Saturated In upper 12 inches [XI Water mar1<s [ J Drift lines [X] Sadi,nent deposits [ I Drainage pattema in wetlands Sacon<la,y Hyc/lD/ogy Indicators [XJ Oxidized root cllannela [ J Water..ialnecl leaves [ J Local IOil survey data [ I FAC-Neutral teat [ I Other (explain In ramarkl) Solla Depth (In.) Hor. Matrix Color Mottle / 2nd Mottle Texture, S!Nclura, etc. color Abundance contrail 0-6 A 6-18 B 10YR 312 10YR313 Hydrlc Soila Indicators [ I Hislolol [ I Histlc Eplpedon I I Sulfidlc Odor 10YR 518 [XI Probable Aquatic Moist Regime [XI Reducing Conclitiona [XI Gleyed or '--"Chroma Colors un1Name: Drainage Class: Ramarka appears to drain poorty Wetland Detennlnatlon [X] ~rophytic Vegetation Prallnt [XI ~ric Soila Preaent [X) Wetland ~rology Pral8nt Remarks fill wetland criteria MET appears to drain poorly wtA A1 toA22 common distinct [XI Conerations Coerae Sandy Loam eobblea Coarse Sandy Loam stones [ J High Organic % In Surface Layer [XI Organic Streaking [ I Llated on Local H~ric Solis Liat [ I Listed on National H~ric Soila List I I Other (explain In remarks) Taxonomy: [ J Field Ob11rvations match map [XI This Data Point is a WaUand Page 2 of 10 Data Fonn Routine Wetland Detenninatlon PrOject/Site: lloaton 124111 Ave. SE Applk:llnl/Owner: Boaton DNlgn & Development Co. Investigator: II. Hackelt Job Number: 031103 City: none Wetland 0,ta Point SP 3 Date: December 17, 2003 County: King State: WI [XI Do nonnal circumataRQN exial on the aite? [ J Haw vegetation, sollt, or hydrology been disturbed? [ ] Is the area I potential problem area? Community 10: Paluatrllln ahrubl Station ID: Plot ID: Vegetation Dominant BPl!iltl Common Nam• % Covet lndlcalllr ttedMAAPHI X Phalalia arundinaCea GreM,Reed Canary 90 FACtN lballl X Salix siJchgnsls Wlllow,Silka 70 FACW Cowardin CIUalfication: pgc % Species that are OBL, FACW, or FAC(.-pt FAC-): 100 Remarkl appeera to drain poorly Hydrology [ I Reconled Data (deaaibe In remarkl) I I Stream. Lake, or Tide Gage I I Aerial Photograph I I Other (describe In remark&) Field Observations: Depth ot Surface Water(ln.): o Depth to FrN Water In Pil(ln.): I Depth to Saturated Solla(ln.): I Remarks appeera to drain poorly Solla Primary Welland Hydto/ogy Indicators [ I Inundated (XI Saturated In upper 12 Inches [ I Water markl [ I Drift iinas [XI Sediment depoaits (XI Drainage pattema In wetlands SecondaJY HydtoloQy Indicators [XI Oxidized root chan°'lt [XI Water-ined leaves I I Local ao11 aurvey data I I FAC-Neu1ral tell I I Other (explain 1n remark&) Depth Hor. (In.) Matrix Color 10YR 311 10YR'4/1 Mottle I 2nd Mottle Texture, Structure, etc. color Abundance contiisl ~ A 6-18 AJ8 Hydtfc Soil$ /naicalots [ I HialolOI [ J Hillie Epipedon ( I Sulfidic Odor 10YR516 I I Probable Aquatic Moist Regime I I Reducing Conditione [ J Gieyed or ~hroma Colors Unit Name: Drainage Class: Rematl<a appears to drain poor1Y Wetland Detennlnatlon (XI Hydrophylic Vegetation Preaenl [XI Hydric Soils Praent [XI Welland Hl'(lrolOgy Preaent Remarks common distinct I I Concretions Coaree Sandy Loam paobies Loamy Sand- [ J High Organic " In Surface Layer I J Organic Stmklno C I Listed on Local Hydric Soils List [ I Uated on National Hydric Soils List [ I Other (explain in remarkl) Taxonomy: C I Field Obsarvationa match map [X) Thia Data Point la a Welland on edge wetland crilerla MET appaara to drain poorly PaQa3of 10 Data Fonn Routine Wetland Detennination Project/Sile: Bo.ton 124th Ave. SE Job Number. 031103 City: none Welland Data Point SP 4 Applicanl,,Owner: eo.ton DNlgn & Development Co. ln-tjgator: M. Heckert Data: Dec:emb9r 17, 2003 County. King State: Wa [XJ Do normal clrcu~ exist on the 1it8? Community JO: [ I Have vegetation, toiia, or hydrology been disturbed? [ ] Is lhe araa a pol8ntial problem aiea? Station JO: Plot ID: Vegetation Domlnanl SpecM Common~ % Cover Indicator 80 F/CN Rubus wmenlacu8 Blaclcberry,Hlmalaya 25 FACU X Sa/ix hoolcerBIIII WillOW,Hool<er 6 FACW- X Popu/yl ltichocaroa Cottoo-Wood. black 40 FAC '14 Specln that ara OBL. FACW, or FAC(except FAC-): 75 Remark& Cowardln Cl881ificallon: PSs-PFO appea,a to drain poo,ty Hydrology I I Recorded Data (dellaille In remar1<a) I I Straam, Uke, or Tide Gage I I Aerial Photograph I I Other (dtsQribe in ramar1<aJ Field ObMrvatlonl: o.pt/1 of Sutface Water(in.): 0 Depth to Frae Water In Pit(ln.): 3 Depth to Saturatecl Soila(in.): 3 Ramar1<a appears lo drain poo,ty Soila Primaiy Wetland Hytl{Ology Indicators [ ) Inundated [XI Saturated In upper 12 lnchm [XI Water mar1<a I I Drift lines I I Sediment deposits [XI Drainage~ in wetlands Secondaty Hyrlro/()Qy lndlcalOtS [XI Q,cidlzed root cllannela [ JW--stainedltaYea [ I Local soil aurvey data [ I FAC-Neutral tut I I Othe< (explain in rama,uJ Depth Hor. Matrix (In.) Color Mottle / 2nd Mottle Te>Ctura, Structure, etc. Color Abundance Contiii! IH6 A/B 10YR<412 10YR 5/6 common di&Unct Coarse Sandy Loam pebble$ Hydtlc Soila ltldk»kxs [ I Hlatosol [ I Hiltic Epipedon [ I Sultldlc Odor [XI Probable Aquatic Moill Regine [XI Reducing Condltiona [XI Gleyed or Low-Chroma Colorl Untt Name: Drainage Class: Remal1cs appears to drain poorly Wetland Detennlnatlon [XI Hydrophytic: V*'8110n Praaent [XI Hydlic Solis "-I [XI WeUand Hydrology Prasant Ramarka wetland criteria MET appears to drain poorly I I Concretion• [ I High Organic % In Surface Layer [XI Organic Str98klng [ I U.ted on Local Hydric Soila Ust I I Lilted on National Hydric Solla Lill I I Other (explain in ramarl<&J Taxonomy: [ I Field Observations match map [XI Thia Data Point ii a Welland Paae 4 of 10 Data Form Routine Wetland Detennlnatlon Projoct/Sil8: Boaton 124111 Ave. SE Applicant/Owner: Boaton DNJgn I Oevalopment Co. Investigator: M. Heckert Job Number: 031103 City: none Wetland Data Point SP 6 Date: o-rtlber 17, 2003 County: King State: Wa [Xl Do no,maJ circumltanc:ea 8lCial on the site? I l Have vegetatloo, aolla, or hydrology been disturbed? [ J la the area I potential problem area? Community ID: Pa1 ... 1r1an 1hrulr' Station ID: Plot ID: Vegetation Dominant S,,,CIN Common Name Hlf"IPHI Phalatis ~ Gtaaa,Reed Canary 80 FACW ~ Spiraea douglasil Spiraea, Douglas' 30 FACW X SaJiJ< alldlansis Willow,Sltka 25 FACW X water blrd1 21 % Speclea that IAI OBL, FACW, or FAC(except FAC-): 76 Remark$ Cowardln Claaalfication: pnc appears to dn1in poony Hydrology [ I Re<:orded Data (delcrlbe In remarka) I l Stream, Lake, or Tide Gage I J Aerial Photograph [ I Other (descn)e In rarnarks) Field Observations: Depth of Surface Water(ln.): o Depth to Free Water in Plt(in.): 8 Depth to Saturated Soila(in.): a Remarks appears to drain poorly Primary Welland Hydrology /ndiCalQrs [ )Inundated [XI Saturated in upper 12 Inches (X]Watermlllka [ )Dlifltines I J Sediment deposits [ J Drainage pattema In wedands Mottle / 2nd Mottle Seoandely Hydto/ogy /ndlca10(s [XI Oxidized root Ch,nnela [Xl Water-stained leaves [ I Local IOil SUMI)' data [ l FAC-Neutral test [ · J Other (explain in remar1<&) Soils Depth Cln.l Hor. Matrix Color Color Abundince contrist Texture, StrUc:IUAI, etc. 0-16 A/B 10YR4/2 10YR 516 common distinct Loamy Sand Hydric Soils lndioa/ors I I HistoaOI [ l Hlatlc Epipedon I I Sulfidlc Odor I I Probable Aquatic Molal Regime I l Reducing Conditions I l Gleyed or Low-Chroma Colors UnttName: Drainage Class: Remarks appears to drain poorly Wetland Detennination [XI Hydropllytic Vegetation p,...nt · [Xl Hydric Solla P,_nt [XI Wetland Hydrology Pnllent Remar1<1 welland criteril MET appears to drain poony [ J Concnitions [ I High Org1nlc % in Surface Llyer I I Organic SIJeaklna I I Usted on Local Hydrie Soila Lill [ l Listed on National Hydric Soila List [ J Other (explain In rarnarks) T 11XOnomy: [ I Field Observltions match map [X) Thia Dita Point la a Wetland Paae5of 10 ATTACHMENT 1 WETLAND DELINEATION MAP 031103 Boston 12411 Ave. SE· 17 WeUand Report February 14, 2005 Project No. GF05001 Ravenna Development, LLC John Minden/Charlie Spaeth c/o JM Architects 12115 100th Ave NE Kirkland, WA 98034 Gary A. Flowers, PLLC Geological & Geotechnical Consulting 19532 12th Avenue NE Shoreline, WA 98155-1106 Subject: Geological and Geotechnical Engineering Study Plat of Fleuve des Voiles ( . j ts:iee.J.. S--=--_,, ~ c,,8 SE 192"d Street@ 124th Avenue SE King County, Washington [..,....~,,...~ \~ -v ?-) ';:S lf"'c:, ~"'-d. :t-1-0 1-{.ci, .L..Q_ This report presents the results of our geological and geotechnical ass~sfm~t f~~posed 39 lot plat to be located north and west of the intersection of SE l 92"d Street and 124 Avenue SE in King County, Washington. The plat will be comprised of.three separate tax parcels. At this time only the center parcel has any previous development. The purpose of our site evaluation was to document existing shallow soil and ground water conditions on the property, including existing slope stability, and to provide data for the design and construction of the planned improvements. Preliminary site plans by Taylor Engineering Consultants, dated September 15, 2004 were used as a reference for this study. PROJECT & SITE CONDITIONS According to the preliminary site drawings provided to us, the subject parcel encompasses about 7.7 acres, and is irregular in shape. It is bounded on the north and east by undeveloped property, on the west by single family residences, and on the south by single family residences or SE 192nd Street. A total of 39 building lots are planned for the plat along with improving 124th Avenue as an entrance road, new internal streets and utilities and storm water treatment and infiltration facilities. See Figure 1, Site & Exploration Plan. The subject site is comprised of several distinct areas. The lower portion of the site is relatively flat, heavily vegetated with bramble bushes and small deciduous trees along with a few larger evergreen trees, and is undeveloped. The entrance road, storm water management facilities, recreational facilities and a native growth protection area will be located within this area. Gary A. Flowers, PLLC. 19532 12th Avenue NE Shoreline, Washington 98155·1106 Pc>J\~l.W7640 ~O't.. Plat of Fleuve des Voiles Geological!Geotechnical Assessment Kent, King County, Washington The central portion of the property slopes upward to the west at an overall slope gradient on the order of 23 percent. Relief is about 84 feet over a horizontal distance of 355 feet. Several steeper and flatter areas are located on the central portion of the site. These areas all appear to be the result of past cutting and filling operations on the site for past and current roads/driveways, and development of a single family residence (Thompson residence) and large garage/shop. The areas that have been oversteepened by past cutting and filling are on the order of 10 feet or less in height except immediately below the existing homeowner' s large garage/shop where the slope is on the order of 14 feet in height. All of the oversteepened areas appear to be currently stable with no obvious visual evidence of slope movement. The area is heavily vegetated with evergreen and deciduous trees, some bramble bushes and other native understory. The upper (westernmost) edge of the property is located at the top of the east facing slope. This area is previously undeveloped except for a couple of small sheds. This area is nearly flat and is heavily vegetated with bramble bushes and both evergreen and deciduous trees. No evidence of standing, flowing or emergent water was observed on the sloping area of the site. No visual indications of slope instability, either current or past, were observed. Subsurface Soil and Ground Water Conditions In order to characterize the shallow subsurface soil and ground water conditions on the property a total of 14 exploration pits were excavated on the parcel on January 26, 2005. The explorations were placed at the approximate locations shown on Figure 1. Four pits were excavated on the lower portion of the property to evaluate the soils for potential infiltration of storm water and/or potential ground water impacts to treatment ponds. Another twelve pits were excavated around the site to evaluate the soils for slope stability, foundations, utility placement and pavement support. All of the pits encountered a layer of forest duff and organic topsoil that was generally on the order of 12 to 14 inches thick. This layer was only 4 to 7 inches thick in EP-4 and EP-7, both areas that were disturbed by past grading operations. The topsoil layer was 21 to 32 inches thick in EP-3 (fill?), EP-12 and EP-16. Fill soils were encountered in EP-7, alongside the existing gravel driveway, overlying a relic topsoil layer. The fill soils were about 18 inches thick and consisted of loose, brown, moist, silty sand with some gravel. The upper 32 inches of soil in EP-3 may also be fill, although the material is almost entirely organic topsoil. Fill soils were not observed in any of the other explorations. However, we anticipate that additional fill soils will be encountered along the slope below the existing driveway, residence, shop and drain field areas near the center of the site. These soils will be removed or regraded during site grading operations. 19532 121h Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155~1106 2 206-417-7640 Plat of Fleuve des Voiles GeologicaVGeotechnica/ Assessment Kent, King County, Washington Underlying the organic topsoil layer in exploration pits EP-1, 2, 3, 4, 8, 13, 14, 15, and 16 a loose to mediwn dense, brown to reddish brown to grayish-brown, sand, gravelly sand or sandy gravel with trace to some silt was encountered. This material 'is interpreted to be recessional outwash sediments that were deposited by meltwater streams emanating from the retreating glacial ice sheet during the Vashon stade of the Fraser glaciation. All of the exploration pits where this sediment was encountered, except for EP-8 and EP-13, are located near the valley bottom. Exploration pits EP-8 and EP-13 are located slightly higher up the side of the slope and may be ice contact sediments that were deposited along the margin of the ice sheet as it was retreating. The recessional outwash sediments extended the full depth of the explorations pits in EP-1, 2, 3, 4, 14, 15 and 16, to a maximwn depth of 13 feet beneath existing ground surface. In EP-8 and EP-13, the recessional outwash or possible ice contact sediments, were underlain by dense to very dense, brownish-gray to grayish-brown, sandy gravel to gravelly sand. This material is interpreted to be advance outwash sediments that were deposited by meltwater streams in front of an advancing ice sheet during the Vashon stade of the Fraser glaciation. As such, these sediments have been consolidated by the overriding weight of several thousands of feet of glacial ice. In exploration pits EP-6, 7, 9, 10, 11 and 12, beneath the forest duff and organic topsoil, or beneath the fill soils in EP-7, mediwn stiff, moist, brown, sandy silt with some gravel over very dense, moist, brownish-gray, silty sand with gravel was encountered. This sediment is interpreted to be Vashon age lodgement till. Lodgement till is a nonhomogenous mixture of sand and gravel in a silt/clay matrix that was deposited at the base of an advancing ice sheet and subsequently overrun and consolidated by thousands of feet of glacial ice. The upper couple feet of this unit have been weathered to a less dense, finer grained condition. The lodgement till extended to the bottom of all the exploration pits where it was encountered. According to the Geologic Map of King County, Washington, by Booth, Haugerud and Sacket, 2002, the subject site is mapped as Vashon age till on the hillsides and Vashon age recessional outwash sediments near the valley bottom. Our interpretation is in general agreement with the published map for the area. Hydrology No indication of standing or flowing water was present on the property at the time of our field work. There was no evidence of erosion anywhere on the parcel. Water infiltrates relatively easily into the upper soil stratum. As a result, it is anticipated that most storm water currently infiltrates into the subsurface sediments and then moves as interflow atop the unweathered lodgement till until it encounters the sands and gravels of the recessional and advance outwash deposits where it is able to further infiltrate. Interflow generally follows surficial topography and for this project would flow towards the east. 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 206-417-7640 3 Plat of Fleuve des Voiles Geologica/!Geotechnical Assessment Kent, King County, Washington Ground water was encountered in exploration pits EP-1, 2, 3, 4, 8, 9, 13, 14 and 15 during our field work. In EP-1, 2, 3, 14, and 15 the ground water is anticipated to be actual regional ground water table for the area. This water table was encountered from about 3 to 9 feet below existing ground surface, depending upon the location of the pit, within the recessional sediments. In EP- 4, 8, 9 and 13 rapid ground water seepage was encountered at a depth of about 4 to 4Yz feet within the recessional or advance outwash sediments. With the exception of EP-4, these pits were all located on the slope area. Seismic Hazards Generally, there are four types of potential geologic hazards associated with large seismic events: l) surficial ground rupture; 2) seismically induced landslides; 3) liquefaction; and 4) ground motion. The potential for each of these to impact the site is discussed below. No surficial faulting or earth rupture has been documented to date in this area of King County. The nearest known fault zones are a branch of the Seattle fault that is located more than IO miles to the north and a branch of the Tacoma fault that is located more than 10 miles to the south. New studies are underway in the region in order to better understand and locate new faults. These studies may someday indicate the presence of a fault closer to the site than we currently know. Slopes on the project site, with the exceptions of several small areas of oversteepened slopes due to past cutting and filling, are generally quite moderate, on the order of 23 percent grade. Given the underlying geologic conditions, either very dense lodgement till or very granular sands and gravels, it is our opinion that the potential risk of damage to the site, by seismically induced landsliding, is low. The existing oversteepened areas that generally appear to be caused by past grading operations will be removed or significantly reduced by project grading. Future steep cuts will be supported by retaining structures. Liquefaction is the result of the loss of shear strength in soils when they are subjected to saturated conditions and seismic shaking. Typical soils that are susceptible are those that are saturated, poorly graded ( all one size), relatively fine-grained and in a loose condition. During a seismic event, severe shaking may cause liquefaction to occur and differential settlement may result. Based on the density and granular nature of the encountered sediments in the proposed building areas, it is our opinion that the risk of liquefaction is negligible and no mitigation is recommended. Based on the encountered stratigraphy, it is our opinion that any earthquake damage to the proposed structures, when founded on suitable foundation bearing strata in accordance with the recommendations provided in this report, would be caused by the intensity and acceleration associated with the event and not any of the above-discussed impacts. Design of the project Gary A. Flowers, PLLC. 19532 12m Avenue NE Shoreline, Washington 98155~1106 206-417-7640 4 Plat of Fleuve des Voiles Geo/ogical/Geotechnica/ Assessment Kent, King County, Washington should be consistent with 2003 International Building Code (IBC) guidelines. In accordance with the 2003 IBC, the following values should be used: Site Class C (Table 1615.1.1) Ss = 135% (Figure 1615.1.2[1]) Si= 44% (Figure 1615.1.2[2]) Infiltration Potential In order to determine an approximate infiltration rate for the receptor soils, we utilized both the USDA Textural Triangle and gradation testing. Use of both methods allows correlation and a higher degree of confidence in the findings. Both of these methods are approved by Washington State Department of Ecology (Ecology) in their 2001 Manual. The design engineer should decide which method is most applicable for this project. The design engineer must also consider the depth to water table in the design. The depth to water table at the time of our field study was on the order of 9 feet below existing grade in the area of the proposed infiltration facilities. Our study was performed during the middle of winter and we do not anticipate that the water table will rise significantly over the remainder of the year. Based on laboratory analyses, and the USDA Textural Triangle, the receptor soils are classified as loamy sand with an estimated short-term infiltration rate, as per Table 3.7, of 2 inches/hour. The receptor soils were relatively homogenous in our exploration pits and borings except for a thin layer of denser, silty sand that was encountered in each exploration at a depth of approximately 7 feet. As per Table 3.7, a minimum correction factor of 2 must be used, thus providing an estimated long-term infiltration rate of 1.0 inches/hour. For actual design purposes, the design engineer should apply a further correction factor, if appropriate. Based on the ASTM gradation testing method, the D10 size for the sand samples tested ranged from .075 to 0.18mm with the higher values for soils on the southern portion of the site (south end of Tract 998 and Tract 995. As per Table 3.8, the estimated long-term infiltration rate for the receptor soils would range from 1.4 to 3 .2 inches/hour. Again, an appropriate correction factor should be implemented by the design engineer. Copies of the sieve analyses are attached. Should a higher infiltration rate be necessary for design purposes, or if County code requires it, field infiltration testing would be necessary to determine the actual infiltration capacity of the receptor soils. Water table was encountered about 4 feet below d bottom of infiltration pond elevation (379.0). Therefore, the potential impact o ground water mounding hould also be modeled. 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155·1106 5 206-417-7640 Plat of Fleuve des Voiles Geo/ogical!Geotechnica/ Assessment Kent, King County, Washing/on Within each of the exploration pits that was excavated in a planned infiltration pond area, i.e. EP- 3, EP-14 and EP-15, a single layer, or interbed, of siltier, higher density sediment was encountered above water table. This layer was encountered at a depth of 8 to 9 feet in EP-3, 66 to 77 inches in EP-14 and 78 to 84 inches in EP-15. This layer, if continuous throughout the infiltration facility, will have an adverse impact on the infiltration rate. As such, either the pond bottom must be below this layer or the layer must be thoroughly penetrated during construction of the facility. We recommend that the location and elevation of each of these three exploration pits be surveyed in order to provide a more exact elevation of the relatively impermeable layer and the water table. It is also important to understand that the design infiltration rate may be compromised if the contractor is not careful to avoid compaction or siltation of the receptor soils. Should either of these conditions occur, the receptor soils must be overexcavated and loosened and/or the upper 2 to 3 feet overexcavated and replaced to remove unwanted silt that has washed into the pond area The pond must not be used as a silt containment pond during construction. The infiltration rate can also be compromised if adequate pretreatment of the influent is not provided or if the facility is not properly maintained to remove any siltation or biomass buildup. CONCLUSIONS AND RECOMMENDATIONS Our exploration indicates that, from a geotechnical standpoint, the subject site is suitable for the proposed development provided the recommendations contained herein are properly followed. The slopes are relatively gentle and are generally underlain by dense, glacially consolidated sediments or coarse grained recessional or ice contact sediments that are considered stable at the slope inclinations encountered on the site. The encountered soils in the lower portions of the site are generally suitable for infiltration of storm water; however, due to the presence of some fine grained component in the receptor soils, and a relatively high water table, the usable infiltration rate will be quite low. Additional, in-situ testing may be necessary in order to ascertain the actual infiltration rate potential for the soils. Site Grading The site should be cleared of all ex1stmg structures, foundation elements and utilities. Vegetation, topsoil, forest duff and trees, that are not required as part of the landscape plan, should also be cleared and removed from the site. Permanent cut slopes on the project should not exceed a gradient of 2H: IV (horizontal to vertical). Slopes for the cells of the wet pond and for the infiltration pond should be excavated at gradients no steeper than 3H:1V. Temporary cuts may be steeper depending upon the encountered soils, generally lH:lV for the recessional outwash sediments and weathered 19532 12th Avenue NE Gary A. Flowers, PLLC Shoreline, Washington 98155-1106 6 206-417,7640 Plat of Fleuve des Voiles Geological/Geotechnical Assessment Kent, King Counly, Washington lodgement till and .75H to .5H:IV for the glacially consolidated advance outwash sediments and unweathered lodgement till. In our opinion, stable construction slopes should be the responsibility of the contractor since they are on-site at all times, and should be determined during construction. The above slope angles are for areas where ground· water seepage is not encountered, and assumes that surface water is not allowed to flow across the temporary slope faces. If ground or surface water is present when the slopes are excavated, flatter slope angles may be required. As is typical with earthwork operations, some sloughing and raveling may occur and cut slopes may have to be adjusted in the field. In addition, WISHA/OSHA regulations should be followed at all times. Fully detailed grading plans were not available at the time this study was completed. As such, we are unsure whether any structural fill will be placed on the site. If structural fill is placed it must be compacted to a dense, nonyielding condition. Structural fill is defined as non-organic soil, acceptable to the engineering geologist, placed in maximum 8-inch loose lifts with each lift being compacted to at least 95 percent of the modified Proctor maximum density using ASTM:D 1557 as the standard. The top of all compacted fill should extend horizontally outward a minimum distance of 3 feet beyond the location of perimeter footings or pavement edges before sloping down at a maximum angle of 2H: IV. Structural fill placed in foundation excavations must extend a minimum distance of 2 feet beyond the edges of the footings. The recessional and advance outwash soils should generally be suitable for re-use as structural fill on the project. The till soils are much finer grained and moisture sensitive and will be more difficult to place except under ideal moisture conditions. All areas to be paved should be crowned or sloped to direct storm water flow to the edges of the roadway and parking areas. The subgrade should then be compacted to a dense and nonyielding condition (minimum 95 percent of the modified Proctor maximum density) with a minimum 20 ton vibratory roller. Prior to application of the pavement section the areas to be paved should be proofrolled with a fully loaded, tandem axle dump truck. Any soft or yielding areas identified during proofrolling should be overexcavated and backfilled with structural fill. Both the compaction of the subgrade and the proofroll should be witnessed and documented by a representative of this firm. Foundation Recommendations Shallow foundations may be used for support of the planned structures when placed on undisturbed or recompacted natural soils or approved structural fill placed atop these materials. An allowable soil bearing value of 2,000 psf may be used in the design of these footings, including both dead and live loads. An increase of one-third may be used for short-term wind or seismic loading. Perimeter footings for all proposed structures should be buried a minimum of 18 inches into the surrounding soil for frost protection. Settlement of footings for residences placed as detailed herein should be negligible. However, foundations placed on disturbed soil may result in increased settlement. All foundation excavations should be inspected by a Gary A. Flowers, PLLC. 19532 12m Avenue NE Shoreline, Washington 98155-1106 206-417-7640 7 Plat of Fleuve des Voiles Geological!Geotechnical Assessment Kent, King County, Washington representative of this firm, prior to concrete placement, to verify that the design bearing capacity of the soils has been attained and that construction conforms to the recommendations contained in this report. The governing municipality may require such inspections. Lateral loads can be resisted by friction between the foundation and the supporting soils, and/or by passive earth pressure acting on the buried portions of the foundations. The foundations must be backfilled with structural fill compacted to at least 95 percent of ASTM:D 1557 to achieve the passive resistance provided below. The structural fill must extend horizontally outward from the embedded portion of the foundation a distance equal to at least three times the embedment depth over which the passive resistance is applied. We recommend the following design parameters. • Passive equivalent fluid= 300 pcf • Coefficient of friction= 0.30 The above values are allowable and include a factor of safety of at least 2.0. Floor Support Recommendations For concrete slab-on-grade floors, we recommend that the upper twelve (12) inches of natural soil beneath the slab be recompacted to a firm, unyielding condition with a density of at least 92 percent of the modified Proctor maximum density using ASTM:D 1557 as the standard. Any yielding areas should be overexcavated and filled with approved structural fill. For areas where moisture intrusion through the floor slab is undesirable, a minimum of 6 inches of pea gravel or very coarse, washed sand should be placed as a capillary break layer. If sand is used it must be compacted to at least 92 percent of the modified Proctor maximum density. A heavy duty (minimum 10 mil) polyethylene plastic vapor barrier should be provided under the floor slab to prevent moisture vapor transmission through the slab. If the vapor barrier becomes compromised in any way during construction it should be replaced or an additional layer added. Retaining Walls Due to the sloping nature of the site we anticipate that multiple retaining walls will be required for development of this site. However, the location, type and height of the walls have not been ascertained at this time. Following are general design recommendations for any reinforced concrete walls that are planned. Retaining walls taller than 3 feet must be lined with a minimum of 12 inches of washed rock to within I foot of finish grade. The washed rock must tie into the footing drain for the wall footing. Retaining walls up to 8 feet high, that are free to rotate, may be designed for an active pressure of 35 pcf with level backfill or 50 pcf with sloping backfill. Additional surcharges such as traffic, other structures, or heavy equipment must be added to these design values. If any retaining walls taller than 8 feet are planned, we should be contacted to evaluate the walls and provide design recommendations. 19532 12Lh Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-t I 06 206-417-7640 8 Plat of Fleuve des Voiles Geological!Geotechnical Assessment Kent, King County, Washington Rockeries At this time we are unsure if rockeries will be used during plat development. However, the following information is provided in the event that rockeries are planned. Rockeries should generally only be used to face, stable, free standing, natural soils. Rockeries that face fill slopes greater than 3 feet in height should not be used in place of retaining walls unless the backfill soil is suitably reinforced, especially where structures and roadways are adjacent to them. In all cases, structures and adjacent rockeries should be set back from rockeries so that a lH:lV (Horizontal:Vertical) line extending up from the rear base of the rockery does not contain a load from roadways, foundations, or other rockeries. It should also be noted that, although rockeries are commonly used, they should be considered a long-term maintenance item. The following notes should be used in the construction of the rockeries. A) The base of the rockery should be started by excavating a trench to a minimum depth of 12 inches below subgrade into firm, undisturbed native ground. If loose, soft, or disturbed materials exist at the base rock location, they should be removed and replaced with free-draining sand and gravel or crushed rock. B) The base excavation should extend out level from the front face of the rockery on native soil at least 2 feet before sloping down at a maximum 2H: 1 V slope. C) The base rock should have a minimum width (perpendicular to the line of the rockery) of 40 percent of the height of the rockery. All rocks should also meet the following weight requirements: Height of Rockery Above 5 feet 5 feet or less Minimum Weight of Rock 500/2200 pounds, graded, top/bottom rocks 500/1000 pounds, graded, top/bottom rocks D) The rock material should all be as nearly rectangular as possible. No stone should be used which does not extend through the wall. The rock material should be hard, sound, durable, and free from weathered portions, seams, cracks or other defects. The rock density should be a minimum of 160 pounds per cubic foot. E) Rock selection and placement should be such that there will be minimum voids and, in the exposed face of the wall, no open voids over 8 inches across in any direction. The rocks should be placed in a manner such that the longitudinal axis of the rock will be at right angles or perpendicular to the rockery face. Each rock should be placed so as to lock into two rocks in the lower tier. After setting each rock course, Gary A. Flowers, PLLC. 19532 12th Avenue NE Shoreline, Washington 98155·1106 206-417-7640 9 Plat of Fleuve des Voiles Geological/Geotechnica/ Assessment Kent, King County, Washington all voids between the rocks should be chinked on the back with quarry rock to eliminate any void sufficient to pass a 2-inch-square probe. F) A drain consisting of rigid, perforated PVC pipe enclosed in a 12-inch-wide pea gravel trench should be placed behind the lower course of rock to remove water and prevent the buildup of hydrostatic pressure behind the rockery. The remainder of the rockery backfill should consist of quarry spalls with a maximum size of 4 inches and a minimum size of2 inches. This material should be placed to a 12-inch-minimum thickness between the entire wall and the cut material. The backfill material should be placed in lifts to an elevation approximately 6 inches below the top of each course of rocks as they are placed, until the uppermost course is placed. Any backfill material falling onto the bearing surface of a rock course should be removed before the setting of the next course. G) Any asphalt paving should be sloped to drain away from the rockery. 1n addition, the areas above rockeries should be planted with grass as soon as possible after rockery construction, to reduce erosion. H) Where fill soils are required, and they are to be faced with rockeries greater than 3 feet in height, they should include the use of geogrid reinforcement. The reinforcement should extend from the back of the rock into the fill at least a distance equal to the height of the rockery. The horizontal spacing of the geogrid layers shall be a maximum of 2 feet and each layer shall be wrapped around the face of the succeeding layer a minimum distance of 4 feet. The soil behind the rockery shall be compacted to a firm and unyielding condition at or near the optimum moisture content of the soil. Pavement Subgrade Recommendations All areas to be paved should be crowned to direct storm water flow to the edges of the roadway and parking areas. The subgrade should then be compacted to a dense and nonyielding condition (minimum 95 percent of the modified Proctor maximum density) with a minimum 20 ton vibratory roller. Prior to placement of the pavement section the subgrade should be proofrolled with a fully loaded, tandem axle dump truck. Any soft or yielding areas identified during proofrolling should be overexcavated and backfilled with structural fill. Both the compaction of the subgrade and the proofroll should be witnessed and documented by a representative of this firm. In the case of utility trench backfill, the structural fill should be placed and compacted in accordance with current local or county codes and standards. The top of all compacted fill should extend horizontally outward a minimum distance of 3 feet beyond the pavement edges before sloping down at a maximum angle of2H:IV. 1953212mAvenueNE Gary A. Flowers, PLLC Shoreline, Washington 98155·1106 10 206-417-7640 Plat of Fleuve des Voiles Geological/Geotechnical Assessment Kent, King County, Washington Site Drainage All perimeter footing walls should be provided with a drain at the footing level. Drains should consist of rigid, perforated, PVC pipe surrounded by washed pea gravel. The level of the perforations in the pipe should be set approximately 2 inches below the bottom of the footing at all locations, and the drains should be constructed with sufficient gradient to allow gravity discharge away from the building. Roof and surface runoff should not discharge into the footing drain system, but should be handled by a separate, rigid, tightline drain that discharges into an approved storm water conveyance system. In planning, exterior grades adjacent to walls should be sloped downward away from the structure to achieve surface drainage. Care should be taken to avoid any grading or construction of any berms or other structures that may cause storm water to flow under the pavement section. Water introduced under the pavement section could result in an unstable subgrade and future pavement failures. During construction there may be areas of subsurface water that are encountered as was done in exploration pits EP-4, EP-8, EP-9 and EP-13. Should this occur, it may be necessary to construct interceptor drains to control the water. One such location may be along the west property line of Lot 27. Due to the wetland located upslope of this lot, subsurface water at a shallow depth is likely and may be the source of water encountered in the exploration pits downslope of that location. The overall need for interceptor drains should be determined during plat development. Infiltration of storm water appears to be a feasible option for this site. Infiltration rates based on the 2001 Washington State Department of Ecology Storm Water Control Manual are provided above in the Infiltration Potential section. As per the manual, these rates generally are considered relatively conservative. If higher rates are needed for the project design in-situ infiltration testing should be performed to confirm an actual design infiltration rate. Care must be taken during construction to avoid compaction of the soils in the infiltration pond area or to allow sediment laden water into the infiltration pond. Should either of these conditions occur, the design infiltration rate of the pond soils may be reduced unless corrective action, as discussed above, is provided. Erosion Control The sediments encountered on the upper portion of the subject site generally contain significant fines and are subject to erosion under both sheet flow and channelized flow regimes. The sediments encountered on the middle and lower portions of the project were coarser grained with lower erosion potential especially under sheet flow. Typical erosion control measures implemented on most construction sites will be suitable to mitigate the hazard of erosion on this site. This should include a silt fence around the low point of the cleared area, covering stockpiles with plastic and re-vegetating cleared areas as soon as possible after construction is completed. A rock mat at the construction entrance should be provided to reduce tracking of soils off of the 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155~1106 11 206-417-7640 Plat of Fleuve des Voiles Geologica//Geotechnical Assessment Kent, King County, Washington site. Extra precautions should be taken to prevent any silt laden water from contaminating the soils in the areas of the proposed infiltration facilities. SUMMARY Based on our site reconnaissance and subsurface explorations the site appears to be suitable for the proposed development provided the recommendations given herein are properly implemented. We recommend that we be retained to review those portions of the plans and specifications that pertain to earthwork, foundations and infiltration to determine that they are consistent with the recommendations of this report. Construction monitoring and consultation services should also be provided to verify that subsurface conditions are as expected. Should conditions be revealed during construction that differs from the anticipated subsurface profile, we will evaluate those conditions and provide alternative recommendations where appropriate. Our findings and recommendations provided in this report were prepared in accordance with generally accepted principles of engineering geology and geotechnical engineering as practiced in the Puget Sound area at the time this report was submitted. We make no other warranty, either express or implied. Sincerely, i Gary A. Flowers, P.G., P.E.G. Engineering Geologist Attachments: 19532 12th Avenue NE Figure 1-Site & Exploration Plan Appendix A -Exploration Logs Appendix B -Laboratory Sieve Analyses Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 12 Robert M. Pride, P.E. Geotechnical Engineer 206-417-7640 I I ,' I . I /1 I ----r-- / ; / ' ;,' ' .' I ,, •/ ,'j,, / " ,~. I •ff!JJtD ·11· :}--"";rf . ., ./ / ~"' LEGEND ' / ', I• ,. ,, '( I i ,, _11, ' \ I 11:11 \ . ' EP-1 • Approximate location of exploralion pit REFERENCE: TAYLOR ENGINEERING CONSULTANTS. GARY A. FLOWERS, PLLC SITE AND EXPLORATION PLAN PLAT OF FLEUVE DES VOILES KENT, KING COUNTY, WASHINGTON /! rl ii '· N A 0 80 SCALE IN FEET FIGURE 1 DATE 1/05 PROJECT NO. GF05001 Plat of Fleuve des Voiles Geo/ogical!Geotechnica/ Assessment Kent, King County, Washington APPENDIX A EXPLORATION LOGS 19532 12th Avenue NE Gary A. Flowers, PLLC. Shoreline, Washington 98155-1106 206-417-7640 EXPLORATION PIT LOG Number EP-1 0----,-----------------------------, 1- 2 - - 3 - - 4 - 5 - - 6 - - 7 - - 8 - - 9 - - 10 - - 11 - - 12 - - 13 Forest duff/topsoil RECESSIONAL OUTWASH Loose becoming medium dense with depth, very moist to saturated, brown, medium-grained SAND with gravel and trace silt B0H@4' Moderate caving Ground water at 33 inches Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysts, and judgment. They are not necessarily representative of other times and location. We will not accept responsiblllty for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - .. EXPLORATION PIT LOG Number EP-2 F crest duff/topsoil RECESSIONAL OUTWASH Loose becoming medium dense with depth, very moist to saturated, grayish-brown, oxidized, medium-grained SAND with gravel and trace silt B0H@4' No caving Ground water at 32 inches Subsurface conditions depicted represent our observa.tion al the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility ror the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-3 0---,------------------------------- -Forest duff/brownish-black, sandy silt with organics (fill?) 1- - 2- 3-RECESSIONAL OUTWASH -Medium dense, moist, grayish-brown, gravelly SAND with trace silt; gravels to 6" diameter 4- - 5- -- 6- - 7_ - 8-At 8'-9' and 11'-12' interbeds of dense, moist, grayish-brown, silty SAND with gravel - g_ - 10- - 11 - - 12 - - BOH@ 13' No caving; rapid ground water seepage at 10-1/2' 13---L~~~~~~~~~~~~~~~~~~~~~~~~~~~---J Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and Judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or Interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-4 Forest duff/toosoil RECESSIONAL OUTWASH Medium dense, moist to saturated, grayish-brown, gravelly SAND to sandy GRAVEL with trace silt; gravel to 6" diameter B0H@8' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent. King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-5 Forest duff/toosoil ADVANCE OUTWASH Dense, moist, grayish-brown, gravelly SAND with trace silt BOH@4' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-6 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium stiff, moist, brown, sandy SILT with some gravel LODGEMENT TILL Very dense, moist, grayish-brown, silty SAND with some gravel ADVANCE OUTWASH Dense, moist, grayish-brown, gravelly SAND with trace silt BOH @7' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretatlon, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-7 i Forest duff/topsoil FILL Loose, moist, brown, silty SAND with some gravel RELIC TOPSOIL LAYER , Loose, moist, brownish-black, sandy SILT with organics WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Very dense, moist, brownish-gray, silty SAND with gravel BOH @7-1/2' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of informallon presented on this log. i ' GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-8 0--r----------------------------, 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil RECESSIONAL OUTWASH Loose to medium dense, moist, brown SAND with some silt and gravel ADVANCE OUTWASH Dense, very moist to saturated, brownish-gray, gravelly SAND with trace silt B0H@5' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the lime and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or Interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-9 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel B0H@6' No caving Rapid ground water seepage at 4' Subsurface conditions depicted represent our observation at the lime and location of this exploratrny hole, modified by geologic interpretation, engineering analysis, and Judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - -- - - - - - - - - - - - - - - - - - - EXPLORATION PIT LOG Number EP-10 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel B0H@6' No caving No ground water . Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and Judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-11 0---r--------------------------- 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel B0H@5' No caving No ground water Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and Judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 0 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - -- - - - - - - - - - - EXPLORATION PIT LOG Number EP-12 Forest duff/topsoil WEATHERED LODGEMENT TILL Medium dense, moist, brown, sandy SILT with some gravel LODGEMENT TILL Dense to very dense, moist, brownish-gray, silty SAND with gravel B0H@6' No caving No ground water Subsurface conditions depicted represent our observation at the lime and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We wlll not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-13 0------.------------------------------. 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, brown, silty SAND with gravel ADVANCE OUTWASH Dense to very dense, moist to wet, grayish-brown, sandy GRAVEL to gravelly SAND with trace silt; gravels to 12" diameter B0H@6' No caving Moderate ground water seepage at 55" Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or Interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-14 0----.----------------------------- - 1 - - 2 - - 3 - - 4 - - 5 - - 6 - - 7 - - 8 - - 9 - - 10 - 11 - - 12- - Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, reddish-brown, silty SAND with some gravel Medium dense, moist to saturated, grayish-brown, gravelly SAND to sandy GRAVEL, trace silt At 66"-77" interbed of dense, grayish-brown silty SAND with some gravel BOH@ 10-1/2' No caving Moderate ground water seepage at 9' 13------L---,.-----------------------------' Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-15 0------.------------------------------- -Forest duff/topsoil 1----11----------------------------------~ RECESSIONAL OUTWASH - 2-Medium dense, moist, reddish-brown, silty SAND with some gravel - 3-Medium dense, moist to saturated, grayish-brown, gravelly SAND with trace silt - 4- - 5- - 6- -At 78"-84" interbed of dense, grayish-brown, silty SAND with some gravel 7_ - 8- - g_ - 10- - 11 - - 12- - BOH@ 13' Moderate caving below 9'; rapid ground water seepage at 9' 13 __,, _______________________________ _. Subsurface conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of infonnation presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 EXPLORATION PIT LOG Number EP-16 0------,------------------------------. 1 2 3 4 5 6 7 8 9 10 11 12 13 - - - - - - - - - - - - - - - - - - - - - - Forest duff/topsoil RECESSIONAL OUTWASH Medium dense, moist, reddish-brown, silty SAND with some gravel Medium dense, moist, grayish-brown, gravelly SAND with trace silt B0H@5' No caving No ground water Subsuriace conditions depicted represent our observation at the time and location of this exploratory hole, modified by geologic interpretation, engineering analysis, and judgment. They are not necessarily representative of other times and location. We will not accept responsibility for the use or interpretation by others of information presented on this log. GARY A. FLOWERS, PLLC Plat of Fleuve des Voiles Kent, King County, Washington Project No. GF05001 January 2005 Plat of Fleuve des Voiles Geologica/!Geotechnica/ Assessment Kent, King County, Washington APPENDIXB SIEVE ANAL Y.SES Gary A. Flowers, PLLC. 19532 I2'h Avenue NE Shoreline, Washington 98155-1106 206-417-7640 Sieve Analysis .:,teve Ana1ys1s I Size opening in Inches I Number ofMesh per Ini:b, US Standard I Specs* Sieve Size %Passing* mm max • ' ' " ' .. '" .. '" " . " " "' " " ,oo ,., 2.00" 100 100 1.50" 88 ----·--- 90 I 84 3/4" 79 . - BO 5/8" 76 1/211 72 ~ 3/8" 64 - 70 1/4" 55 ~- #4 50 60 ' #8 41 ' #10 39 M s -·~-' #16 35 ·~ 50 " ~ #30 29 --#40 24 40 #50 19 --#100 9 -- 30 -#200 5.5 --- ~ 20 ~ ~ !O --- 0 100 JO I 01 0.01 Grain Size (mm)-Corps or Engine en Uni Corm Soil Cla!ISifii:ation Material: Brown irravelly sand Source: EP-3, 6-8' Samnle Number Depth (ft Classification Nat. W.C. LL P.J. Proiect: QC -Soos Creek Plat 9075 Proiect #: rM025.1.C F 0500 I) Date Rec'd: ,,/'1/24/QS / F/ 1 / /,/f!;,;/ ~ MA YES TESTING ENGINEERS Sieve90751/27/2005 "'We Make a Dllterence'" Sieve Ana..l1_sis I Size opening in Inches I Number of Mesh per Inch, US SW!dard too " ' '.' 1 .~ .. 1r.> ~ '" u A _if\ " ::11'1 .tn M ,m - 90 80 70~ .5 60 • 50 ;. ~ 40 I'= 30 20 10 -±:::: ~ 0 100 10 1 0.1 Graio Size (mm) • Corps of Engineers Uniform Soil Clas:sifiaitlon Sample Number[Depth f!!)j Classification Nat. W.C. [L.L. P.I. 9075A Sieve9075A 1/27/2005 I 0.01 :sieve Analysis Specs• Sieve Size % Passing• I min max #10 100 #16 89 #40 62 #50 47 #100 24 #200 13.9 Material: Brown grave!l1_ sand Source: EP-3, 6-8' Project: QC-Soos Creek Plat Pr_oiect #: Q4025 (GF0500_Ll Date Rec'd: ,el114f05, Y ~ Reviewed~~~ MAYES TESTING ENGINEERS "'W• Make • D,,,.,..nce• Sieve Analysis "1eve Analysis I Size opening in Inches I Number of Mesh per Inch, US Standard I Specs* Sieve Size % Passing* min max • ' ' ,, ' .. ,a YO '" .. ' " " "' " " ,oo ,oo 2.00" 100 [00 1.50" 95 I 92 90 3/4" 92 ' 5/8" 90 BO ' 1/2" 89 ~ -3/8" 86 70 ' 1/4" 82 -·--' #4 79 ~ -- 60 . --#8 72 ~ ----#10 70 • #16 66 ·a ' ; so ~ #30 56 "#- ' #40 47 40 ~ --' #50 36 ---- #100 18 30 " #200 9.6 -~ -· - . -·- 2D ---·-' -- ~- lO -- 0 . [00 lO [ 0.l O.Ot Grain Stie (mm) -Corps of Engine en Uniform Soll Clanif'ication Material: Brown O'n'!Vellv sand Source: EP-14, 5-6' Sample Number Depth (ft Classification Nat. W.C. L.L. P.l. Project: QC • Soos Creek Plat 9076 Proiect #: Q4025 (GF 05001) Date Rec'd: ~~/ . ~ /y/~ -..6-' MA YES TESTING ENGINEERS Sieve90761 /28/2005 "'We Mali:• a Dfffaren,,. .. Sieve Analvsls .:ueve Analysis I Size opening ill Inches I Number of Mesh. per Inch., US Standani I Specs* Sieve Size % Passing* min max 100 ' ' ' ,s ' '.,I/al ,n = "' ti ' " " ,0 " ~ ,m = #IO 100 . 90 .. #16 94 . 80 .. -·--' .. #40 67 70 --.. . ... #50 52 ·- #100 26 .[ 60 .. .•. . -----#200 13.7 ::l 50 ·-~ '$. 40 .. 30 .. -----. .. 20 lO . § 0 100 10 1 0.1 0.01 Grain Size (mm) -Corps of Engineers Uuiform SoU Classification Material: Brown eravelly sand Source: EP-14' 5-6' Sample Number Depth (ft) Classification Nat. W.C. L.L. P.1. Project: QC-Soos Creek Plat 9076A Project#: Q4025 (GF05001) Date Rec'd: ..-I-/N,'2005 ' ~ /~ / ' . MA YES TESTING 1/iNGINliiliiRS Sieve9076A 1/28/2005 '"We llake a Difference• I • ' ' '' ' .. '" "' 100 .. ,-' 90 ' ' • 80 ' . 70 ··"' 60 - e --~ ._ __ ·~ 50 ~ ~- ~ 40 ... 30 . 20 10 . -,_ ~~ ~-,- --C-,_ 0 JOO 10 Sample Number Deoth (ft 9077 Sleve90771/28/2005 Sieve Analysis Size opeTiing in Inchc$ I Number ofMc$h per Inch, US Stancbrd I "' " . " " "' " " "' "" •. .~ ' ... ~ ~ I 0.\ O.ot Grain Size (mm)-Corps or Engineers Uniform Soil Classification Classification Nat. W.C. L.L. P.L ~,eve Analysis Specs* Sieve Size %Passing* min 2.0011 100 1.50" JOO I 91 3/4" 84 5/8" 80 l/2" 74 3/8" 70 1/4" 64 #4 61 #8 54 #10 53 #16 49 #30 43 #40 37 #50 29 #100 16 #200 9.4 Material: Brown o-ravellv sand Source: EP-14, 8-9' Proiect: QC • Soos Creek Plat Project#: 04025 (GF 05001\ Date Rec'd: . 5 ~ ,,/~Yz - MA YES TESTING ENGINEERS -We Make • D,,,.,..nce• max ~- Sieve Analvsis c,Ieve Ana1ys1s I Size opening in Inches I Number of Mesh per Inch. US Standard I Specs* Sieve Size % Passing* min max IOO " ' ' '' ' "' '" = '" li ' '" " M " " ,M = .. #IO 100 90 #16 94 + #40 70 80 ~ .. . #50 55 70 e ---~·---#JOO 31 ~ 60 --.. C #200 17.9 ·~ 50 ~ . .. .. ~ 40 --. ]0 ··---· ---·--· - 20 10 -_, - 0 100 10 I 0.1 0.01 Gnin Siu (mm) -Corps of Engineers Uniform Soil ClassJRcation -- Material: Brown eravelly sand -Source: EP-14, 8-9' Sample Number Depth /ft Classification Nat. W.C. L.L. P.l. Project: QC-Soos Creek Plat 9077A Project#: Q4025 (GF05001) Date Rec'd: 1 /} ~ /~-If( MA YES TESTING ENGINEERS Sieve9077 A 1/28/2005 ""W'• Mah • Dfffw,renc•'" Sieve Analysis c,Jeve Analysis I Size opening in Inches I Number ofMesh per lnch. US Standard I Specs• Sieve Size %Passing* min max • ' ' '' ' '" ,n "' "' 100 u ' " " " " " ,oo ""' 2.00" 100 " 1.50" 95 ~ ---~--~ 1 90 90 " " 3/4" 85 -5/8" 83 80 a~ ' -•-" 1/2" 78 " 3/8" 73 70 1/4" 65 ' --·-·-. -. --' #4 61 60 #8 52 ' #10 50 ~ • ' ., ~--~ . --------~ #16 45 ~ 50 ~ ~ ~ #30 36 ~ ' #40 28 40 -' #50 19 --··-. " . .. #100 7 30 #200 3.3 .. 20 ' -- 10 - 0 100 10 I 0.1 O.ot Grain Size (mm)· Corps or Englneen Unifonn Soil Classificatloo Material: Brown gravellv sand Source: EP-15, 5-6' Sample Number Depth (ft Classification Nat. W.C. L.L. P.I. Project: QC • Soos Creek Plat 9078 Project#: Q4025 (GF 05001) Date Rec'd: /1724/2005)/ / - / ~.-r ' // MA YES TESTING ENGINEERS Sieve90781 /28/2005 -We Make • Difference'" Sieve Analvsis c,1eve Analysis I Size opening in Inches I Number of Mesh per lncll, US Standard I Specs• (00 ' ' ' " ' :11~ '" "' '" ~ ' " " M '" ~ ,M -Sieve Size %Passing* min max -#IO 100 90 . - #16 89 80 .. -#40 57 ----· --··-~ #50 39 70 -#100 15 -60 . C ------#200 6.6 1 50 -. ~ .. '$ 40 . 30 ·-. . - -. 20 --- 10 ..• - ·- 0 - IOO IO l 0.1 o.oi Grain Size (mm) • Corp$ ofEni:inttrs Uniform Soil Classification Material: Brown filavellv sand Source: EP-15, 5-6' Samnle Number D~th /ft Classification Nat. W.C. LL PJ. Proiect: QC-Soos Creek Plat 9078A Proiect #: Q4025 ( GFOSOO I) Date Rec'd: 1 ....-? " / ~ /,,Pj -, MA YES Tlf!STING ENGINEERS Sieve9078A 1/28/2005 "'We Mek.e • Dffferenca .. - Sieve Analysis Neve Ana1ys1s I Size opening in lnclies Number of Mesh per Inch, US Standard I Specs• Sieve Size % Passing* mm max LOO 4 ; ' '' ' "' '" "' ,,. " ' " " " " " "' . ,00 1.50" 100 ~ I 1/4 95 90 I 90 3/4" 81 80 5/8 11 76 -. 1/2° 72 -- . 70 ~ 3/8 11 67 ' #4 55 60 . ~ #8 46 #JO 44 ~ a #16 50 ~ --39 ~-#40 26 40 #50 19 - ~ . -#100 9 30 ~ #200 5.3 ·- 20 ~ LO ~ I -- 0 100 10 I 0.1 0.01 Grain Size (mm)-Corpi; ofEnginll!ers Uniform Soil ClaHificatlon Material: Brown sandy gravel Source: #15, 8-9' Sarrmle Number D=th (ft Classification Nat. W.C. L.L. P.I. Proiect: QC-Soos Creek Plat 9079 Proiect #: ""-025 (GF05001 \ Date Rec'd: '-""" '"'005 Y'7 - ' ~& _:7./C Sieve90791 /28/2005 MA YES Tll:STING 11:NGINll:ll:RS "'W'e Make • Dlfferenc.• Sieve Analvsis ~1eve Anaiys1s I Size opening in Inches I Number of Mesh per Incli, US Standard I Specs• Sieve Size % Passing* min max 100 " ' ' '' ' '" '" ,. "' ~ "i ,. " ffl M ,oo ,oo #10 100 90 #16 89 ,0 #40 59 -#50 44 70 -· #100 21 -60 - ·~ 50 #200 12.0 - ~ '$. 40 30 ~ - 20 IO 0 -· . 100 to I O.t 0.01 Gr•ln Sb:t (mm)-Corps of Engineers Uniform Soil Oassificatlon Material: Brown irravelly sand Source: #15, 8-9, Sample Number Depth (ft) Classification Nat. W.C. L.L. P.I. Project: QC-Soos Creek Plat 9079A Proiect #: 04025(<,F0500!) . Date Rec'd: 1/24/2005 'ifl~ . -,,/ ,;.>,-· MA YES TESTING ENGINEERS Sieve9079A 1/28/2005 '"We Mab a Dfffvrence• William Popp Associates Transportation Engineers/Planners ( 425) 401-1030 FAX (425) 401-2125 e-mail: info@wmpoppassoc.com TRAFFIC IMP ACT ANALYSIS for Fleuve des Voiles New Single Family Residential Development Prepared for: Charlie Spaeth I John Minden 6839 Ravenna Ave. NE Seattle, WA 98115 ·-! "' //', ! Prepared by: /(/, William Popp Associates 14-400 Building, Suite 206 14400 Bel-Red Rd Bellevue, WA 98007 May 25, 2005 14-400 Building• Suite 206 • 14400 Bel-Red Road• Bellevue, WA 98007 Traffic Impact Analysis (5/25105) Fleuve des Voiles TABLE OF CONTENTS INTRODUCTION ......................................................................................................................................... 1 I. PROJECT DESCRIPTION .................................................................................................................. 1 U. EXISTING CONDITIONS ..................................................................................................................... I A. TRANSPORTATION FACILITY INVENTORY ............................................................................................. 1 B. PEDESTRIAN SERVICES ......................................................................................................................... 2 C. EXISTING TRAFFIC VOLUMES ............................................................................................................... 2 D. SIGHT DISTANCE (SSD AND ESD) ....................................................................................................... 2 Table I Sight Distance Requirements at SE 192"' St/124"' Ave SE .......................................................... 3 E. ACCIDENTS .......................................................................................................................................... 4 Table 2 Accident History ........................................................................................................................... 4 F. KING COUNTY CAPITAL IMPROVEMENT PROGRAM .............................................................................. 4 -III. ANALYSIS ............................................................................................................................................. 4 A. BACKGROUND TRAFFIC GROWTH ........................................................................................................ 4 B. TRIP GENERATION ................................................................................................................................ 5 Table 3 Project Vehicular Trip Generation ............................................................................................... 6 C. TRIP DISTRIBUTION AND TRAFFIC ASSIGNMENT ................................................................................... 6 Table 4 Trip Distribution Summary (AM and PM Peak Hour) ................................................................. 6 D. BACKGROUND TRAFFIC PLUS PROJECT TRAFFIC VOLUMES .................................................................. 7 Table 5 2005 and 2007 Peak Hour Traffic Volumes' ............................................................................... 7 E. LEVEL-OF-SERVICE (EXISTING AND FUTURE) ....................................................................................... 7 Table 6 Intersection Level-of-Service Criteria .......................................................................................... 8 Table 7 Level ofService-2005 and 2007 PM Peak Hour with Project' ................................................. 9 F. QUEUING ............................................................................................................................................ 11 Table 8 Peak Hour Queuing Estimates ' .................................................................................................. 12 G. LEFT TURN POCKET WARRANT ANALYSIS ......................................................................................... 12 Table 9 Left Turn Lane Warrant Analysis ............................................................................................... 13 IV. CONCLUSIONS .............................................................................................................................. 13 V. MITIGATION RECOMMENDATIONS .......................................................................................... 15 TECHNICAL APPENDIX William Popp Associates Page i Traffic Impact Analysis (5/25/05) Fleuve des Voiles INTRODUCTION The following report was prepared to address King County Traffic Engineering's request for a Traffic Impact Analysis of the proposed Fleuve des Voiles new residential development located in the Soos Creek area of unincorporated King County. The traffic analysis includes, among other things, analysis of intersections impacted by project traffic that meet certain criteria. That criteria is specified in King County Ordinance 11617, Section 60 Intersection Standards", which requires analysis of all intersections (including project driveways) impacted by no less than 20 percent of the project peak hour traffic and no less than 30 peak hour project generated trips during that same hour. Based on project traffic estimates contained herein, the project is only required to conduct an analysis of off-site conditions at the SE l 92"d St/124th Ave SE intersection only I. PROJECT DESCRIPTION The proposed development is located on the west side of the extension of 124th Ave NE approximately 300 feet north of SE 192"d Street. A vicinity map is presented in Figure I. The proposed development will include a total of 33 single family units. The total area of the site is approximately 6.9 acres. The site is currently served by a gravel road that also serves three existing single family homes, one of which is occupied, one is currently vacant but posted for rent, and one appears to be not habitable. The site is assumed to be completed and occupied by 2007. The proposed site plan is presented in Figure 2. II. EXISTING CONDITIONS A. Transportation Facility Inventory The site is currently served by a private gravel road from SE l 92"d St which is the north extension of !24th Ave SE. The road will be improved per the King County Road Standards (Section 2.03) to public urban residential Sub-Access Street standards. This standard requires a pavement width of 24 feet plus curb and 5-foot sidewalk on one side. SE 192"d St is functionally classified as a Principal Arterial traversing east-west near the south side of the site. This roadway provides connection between SR 515 and 140th Ave SE. The cross section includes two I I-foot lanes, a 7-foot pedestrian asphalt path on the north side ( channelized with rumble bars and fog line), a 6 to 8-foot paved shoulder on the south side (west of 124th Ave SE) and a 6-foot asphalt sidewalk (east of 124th Ave SE). The roadway is channelized with a double yellow centerline with occasional skip William Popp Associates Page I ;r WILLIAM POPP ASSOCIATES 14400 Bel-Red.Rd #206 Bellevue, WA 98007 425.401.1030 wepa@seanet.com. ~ • ~ ll600 ST SE l9nH • VICINITY MAP Figure 1 I North I ._Lit\-\ f--1 '--j./ ui,;n, Sl Sl.lfil!r St 1887; I " - 100T SE 201ST SE ro2t.e ::,: SE SE 221: --sr- Fleuve des Voiles Subdivision \ \ ~~1~~~~~,//~~~~_J\ 0s_ /,,, WILLIAM POPP ASSOCIA TES 14400 Bet.Red Rd #206 Bellevue, WA 98007 425.401.1030 wepa@seanet.com I SITE PLAN ~ I I r I . i ii Figure 2 I North ,0 I~' \ ' ) '-....._~I ' Fleuve des Voiles; Subdivision Traffic Impact Analysis (5/25/05) Fleuve des Voiles stripe delineation for acceptable passing zones, and fog lines. The posted speed limit is 40 mph, however east of !24th Ave SE the speed limit is reduced to 20 mph in the vicinity of the Junior High School during times when "Children are Present". Heading west from 1241h Ave SE to approximately 121 st Pl SE, the roadway slopes upward at an approximate rate of 11 %. Heading east from 1241h Ave SE, the roadway slopes downward at an approximate rate of 8% that quickly levels out some 400 feet east near Meeker Junior High School. 124th Ave SE is functionally classified as a Collector Arterial traversing north-south south of SE 192nd St. This roadway provides connection between SE 192nd St and SE 208th St. The cross section includes two 11-foot lanes, a 6 to 8-foot shoulder on the west side, a 3 to 4-foot paved shoulder on east side, and channelized with a double yellow centerline and fog lines. The posted speed limit is 35 mph. The improved roadway extension of 124th Ave SE north of SE 192nd St will be classified as an urban sub-access street. B. Pedestrian Services The available pedestrian facilities in the immediate vicinity of the site consist of a large paved shoulder approximately 7 feet wide on the north side of SE 192nd Street that is channelized with rumble bars and fog line delineation. There is a short sidewalk section on the south side of SE 192nd St between 124th Ave SE and the school. There is also a pedestrian signal and crosswalk just to the east of 124th Ave SE (where the sidewalk ends). C. Existing Traffic Volumes A weekday AM and PM peak period count was conducted at the SE 192nd St/124th Ave SE intersection Tuesday December 10, 2002. The counts were adjusted to mid-2005 utilizing a growth rate of 3% per year for 2.5 years to reflect current conditions. A summary of the existing 2005 turning movements for the PM peak hour are presented in Figure 3. Both the AM and PM peak hour turning movements are also found in the Technical Appendix. D. Sight Distance (SSD and ESD) A sight distance analysis for both the stopping sight distance (SSD) and the entering sight distance (ESD) at the SE 192nd St/124th Ave SE intersection was evaluated. The ESD terminology was taken from the King County Road Standards. The SSD is the distance needed for a vehicle traveling at design speed on the major road to stop before reaching a stationary 6" high object in its' path. This criteria of course applies continuously along the roadway and the measured SSD generally indicates the design speed of the roadway. The minimum required stopping sight distances, obtained from Table 2.1 of the 1993 King County Road Standards (KCRS), are shown for various speed conditions in Table 1 below. William Popp Associates Page2 Traffic Impact Analysis (5125/05) Fleuve des Voiles The other sight distance considered is Entering Sight Distance (ESD). ESD as defined by KCRS deals with the ability of side street entering and mainline left-turning motorists to see oncoming vehicles with sufficient time to make entering or crossing maneuvers without significantly impeding the speed of the mainline traffic or creating hazardous conflict conditions. Entering sight distance thresholds are highest for the condition that allows a vehicle to enter the major street and attain 85 percent of the design speed before being overtaken by an approaching vehicle. As a result, the entering sight distance for this condition relates more to driver comfort rather than safety. The minimum acceptable values for entering sight distance per the County standards are also shown in Table I. These values represent a compromise between the crossing and entering conditions described above. Table 1 Sight Distance Requirements at SE 192"' St/124'" Ave SE Design Sight Distance (ft) Intersection Speed' Grade b Required' Observed' Stopping Sight Distance (SSD) ' approach from west 50mph -11% 635' 800' approach from east 50mph +8% 415' 1,900' Entering Sight Distance (ESD) I • b d ' f looking left 50mph n/a 685' 1,900' looking right 50mph n/a 685' 850' Design speed assumed at 50 mph, or +IO mph over posted speed of 40 mph. Grade on SE 19200 St (worst case grade used). Grade adjustments only applicable for SSD. Per Table 2.1 of the 1993 King County Road Standards. SSD values adjusted for grade; SSD for level condition is 475'. Observed values are +/. 50'. Stopping sight distance assumes an eye height of 3. 5' in approaching lane, and an object height of 0.5' at intersection. Entering sight distance assumes an eye height of3.5' set back 10 from edge of traveled way, and an object height of 4.25' in the approaching lane. For a design speed of50 mph, the minimum stopping sight distance is 475 feet for level conditions (between-3% and +3%). When adjusted for grade, the minimum stopping sight distance is 635' approaching from the west and 415' approaching from the east. The minimum entering sight distance is 685 feet. Entering sight distance is not normally adjusted for grade since the entering vehicle will traverse the same grade as the approaching vehicle. As shown in Table I, there is adequate stopping sight distance and entering sight distance at the SE 192°d St/I 24th Ave SE intersection. William Popp Associates Page3 Traffic Impact Analysis (5/25/05) Fleuve des Voiles E. Accidents The three year accident history at the SE 192"d St/124th Ave SE intersection for the period of January 1, 2000 through December 31, 2002 was provided by King County. A summary of the accident history at this intersection is provided in Table 2. Intersection SE 192nd St/124' Ave SE Table 2 Accident History 2000 Year 2001 4 2002 Total 6 11 As shown in Table 2, there were 11 accidents at this intersection between 2000 and 2002 inclusive. All of the eleven accidents were injury related. Seven of those intersections were right-angle type accidents, and 4 were rear-end accidents. The accident rate over the course of the three year period was 0.76 accidents per million entering vehicles (acc/mev), however, the accident rate in 2002 was 1.25 acc/mev. Any location where the accident rates exceeds 1.0 acc/mev is generally considered for further review. According to the County, this intersection is currently a High Accident Location and meets traffic signalization warrants. F. King County Capital Improvement Program The County's Capital Improvement Program (CIP) includes improvement of SE 192"d Street between Benson Road and 140th Ave SE; Project Number 401595. Plans include widening to 3 lanes plus pedestrian improvements and intersection improvements, to be constructed in phases. Recently however, and due to safety concerns, the intersection of SE 192"d St and 124th Ave SE was proposed as a separate project from 401595. The project number for this project is now 401004 and includes construction of a I 00-foot westbound left-tum lane, pedestrian walkway along north side of SE 192"d Street from intersection to Meeker Junior High School, new steel pole traffic signal, pedestrian improvements around intersection radii, and possibly removal of the existing pedestrian signal at Meeker Junior High School. The County has indicated that this project is proposed as a short term small budget project and will likely be constructed within the next few years. Ill. ANALYSIS A. Background Traffic Growth Typically, background traffic volumes are estimated by factoring the existing traffic volumes by the historical growth in traffic to the project's horizon year and adding in known pipeline development proposals. Traffic volumes at this intersection based on William Popp Associates Page 4 Traffic Impact Analysis (5125105) Fleuve des Voiles King County historical data (1993 through 2003) indicate the volume at this intersection is increasing at an approximate rate of 1.4% per year with annual fluctuations ranging between 0.9% and 2.8%. A chart depicting this growth is shown in the Technical Appendix. King County Department of Transportation suggested using a rate of3.0 percent annually. Thus, for the purpose of this analysis, a factor of 3.0 percent per year was applied to existing PM peak hour counts to achieve 2007 background volumes. PM peak hour 2007 volumes without project (ie., future background traffic forecast) are shown in Figure 3. In addition to the background growth rate, two separate single family development projects are currently being proposed adjacent to this project. One is the Cogger property which is likely to be a maximum of 8 single family lots located between Fleuve des Voiles and SE 192°d St and its' sole access will be a connection to the Fleuve des Voiles project. The other project is the Trinity single family development which is likely to be a maximum of 40 single family lots. This project is being required jointly with Fleuve des Voiles by King County to provide a connection between the two. The primary access for Trinity will be north to SE 188tll St and then west to 116tll It is important to note that without the Fleuve des Voiles project, the Cogger project probably is not developed and the Trinity project would not access south to the SE 192°d St/124tll Ave SE intersection. Therefore, the background traffic estimates at this intersection do not include these projects. They are however included as part of the background plus project (Fleuve des Voiles) volumes. Refer to Figure 3; 2007 with project volumes circle. B. Trip Generation Trip generation for the proposed project was calculated using trip generation rates obtained from the Seventh Edition of the ITE Trip Generation Report, 2003. For this site, trip generation rates are associated with Land Use Code 210, Single Family Dwelling Units, were used. The results of the trip generation analysis are presented in Table 3. William Popp Associates Page5 2005 Existing NOD ~,L o_J 777 891 SE 192nd S1 "' .;; II'. "' xx. PM Peak Hour Traffic Volumes WILLIAM POPP ASSOCIATES 14400 Bel•Red Rd #206 Bellevue, WA 98007 425.401.1030 wepa@seanet.com L_ 1 ~-255 1116 '11 ~o; SE 188th St SE 208th St 2007 wi1hou1 Project NOD L_ 1 J;~ --271 r--123 o~' l'.1 B25-- 95-, ~o~ Petrovit Rd w "' • > <( ~ 1o w "' • " g ~ w "' • > <( ~ ~ TRAFFIC VOLUMES 2007 with Project• North "'~ ~ L __ 15 J L --271 I 1 12, 14 _J 1!1 825 --- 951 ~ Ul~ • plus Cogger & Trinity Figure 3 w "' • > <( ~ 5 ~ SE 192nd St Fleuve des Voiles Subdivision Traffic impact Analysis (5125105) Fleuve des Voiles Table3 Project Vehicular Trip Generation !TE Land Use AM Peak PM Peak Code Size AWDT Total In Out Total In Out 210' 40 lots Rate 9.57 0.750 0.250 0.750 1.010 0.640 0.360 Vol 383 30 8 22 40 26 14 210 8 lots Rate 9.57 0.750 0.250 0.750 1.010 0.640 0.360 Vol 77 6 2 4 8 5 3 210 41 lots Rate 9.57 0.750 0.250 0.750 1.010 0.640 0.360 Vol 392 31 8 23 41 26 15 a LUC 210-Single Family Dwelling Unit As shown in Table 3, the proposed Fleuve des Voiles project is estimated per ITE to generate a total of 392 average weekday daily trips, 31 AM, and 41 PM peak hour trips to the surrounding street system. The Cogger project is estimated to generate a total of 77 average weekday daily trips, 6 AM, and 8 PM peak hour trips, and the Trinity project is estimated to generate a total of 383 average weekday daily trips, 30 AM, and 40 PM peak hour trips. C. Trip Distribution and Traffic Assignment Trip distribution patterns used to determine the AM and PM peak hour the project traffic assignment were nominally based on traffic counts on SE 92"d St and 124th Ave SE as well as traffic engineering judgment. The estimated distribution percentages and project trips are shown in Table 4. Table 4 Trip Distribution Summary (AM and PM Peak Hour) Distribution Project Trips (AM PK) Project Trips (PM PK) Roadway Percentage In Out In Out SE 192"" St (west) 40% 3 I I 11 6 I 16th Ave SE (north) 20% 2 5 5 3 SE 192"• St ( east) 30% 1 6 6 4 124th Ave SE (south) 10% 1 2 2 1 Total 1000/o 6 19 21 12 As shown in Table 4, the majority (40%) of the project trips will be to/from the west on SE 192"d St. The project's AM and PM peak hour traffic assignment to the surrounding William Popp Associates Page 6 Traffic Impact Analysis (5125/05) Fleuve des Voiles roadway network is shown in Figure 4. Based on this table and Figure 4, no other intersection other than the SE 192°d St/] 24th Ave SE intersection is subject to analysis within this traffic study as the 30 trip threshold disseminates below 30 trips past this intersection. It is important to note that since it is presumed that there will be an ultimate connection north to the proposed Trinity development, it is estimated that 20% of the Fleuve des Voiles project trips will use this connection through Trinity for northerly destinations. In addition, it is estimated that approximately 30% of the Trinity development trips will use the connection south through Fleuve des Voiles for destinations southeast. D. Background Traffic plus Project Traffic Volumes Year 2007 PM peak hour with-project traffic volumes were developed by adding project trips to the year 2007 background traffic volumes. Table 5 shows the impact of project traffic as a percentage at the SE 192°d St/124th Ave SE intersection. Table 5 2005 and 2007 Peak Hour Traffic Volumes' 2007 2007 2005 withou1 Trinity Cogger Project with Project Intersection Existing Project Yeh Yeh Veh c Project Impact(%) d AM PEAK HOUR 1,443 1,531 8 6 26 1,571 1.66% PM PEAK HOUR 1,421 1,508 11 7 33 1,559 2.12% Total AM or PM peak hour vehicles entering the SE 192nd St/124th Ave SE intersection. b Background growth reflect a growth rate of3.0% per year. Fleuve des Voiles. Vehicle trips estimated from proposed site use. d Project impact; percent of total entering traffic. As shown in Table 5, the impact of project traffic at the SE 192°d St/124th Ave SE intersection is 1.66% of total entering traffic during the AM peak hour and 2.12% during the PM peak hour. The new trips generated by the proposed project at this intersection is estimated to be 26 PM peak hour trips during the AM peak hour, and 33 during the PM peak hour. Year 2007 PM peak hour with project volumes are presented in Figure 3. AM peak hour volumes as well as PM peak hour volumes are also found in the Technical Appendix. E. Level-of-Service (Existing and Future) Level-of-service (LOS) is a term defined by transportation and traffic engineers as a qualitative and quantitative measure of operational conditions within a traffic stream and the perception of these conditions by motorists and/or passengers. There are several quantitative indices utilized depending on the type of intersection control present. There William Popp Associates Page 7 w "' ~ 5 "' AM PEAK HOUR :::::;.£:!.~ L (21 Jjl (3)--J I Petrovitsky Rd w "' • :1 5 (2) 1-3-(-5)~~11~_ I SE 1BBth St-+-- SE 192nd St 6 (11) 11 (3) SE 208th St xx· PM Peak Hour Project Traffic Volumes (41 sfdu's) (xx) -AM Peak Hour Project Traffic Volumes (41 sfdu's) WILLIAM POPP ASSOCIATES 1(2) 2(1) w "' • ~ 5 " PM PEAK HOUR .,_ ~ L_ • JIL 11 _J N 8 (2) 5 (7) 14400 Bel-Red Rd #206 Bellevue. WA 98007 42S.401.1030 wepa@seanct.com PROJECT TRAFFIC VOLUMES Figure 4 -$" SE 192nd St Fleuve des Voiles Subdtvision Traffic Impact Analysis (5/25/05) Fleuve des Voiles are six levels-of-service that are given letter designations from "A" to "F", with "A" being the best, or minimum delay conditions, and "F" being the worst, with maximum delay or jammed conditions. LOS "C" or "D" is generally considered acceptable for planning and design purposes, while LOS "E" represents operating conditions at or near capacity with freedom to maneuver being extremely difficult. Level-of-service for the existing condition, as well as future conditions, were calculated using the techniques presented in the 2000 Highway Capacity Manual (HCM). The supporting Highway Capacity Software utilized for all calculations is version 4.lc. Level-of-service criteria and definitions for signalized and non-signalized intersections are presented in Table 4. Table 6 Intersection Level-of-Service Criteria Level of Service A B C D E F Definition Little or no delay Short traffic delays Average traffic delays Long traffic delays Very long traffic delays Extreme delay l Delay; seconds per vehicle Stopped Delay Per Vehicle signalized non-signalized Less than 10.0 sec 10.1 to 20 sec 20.1 to 35 sec 35.1 to 55 sec 55.1 to 80 sec Greater than 80 sec Less than 10.0 sec JO.I to 15 sec 15.1 to 25 sec 25.1 to 35 sec 35.1 to 50 sec Greater than 50 sec The existing (year 2005) and the future (year 2007) weekday AM and PM peak hour level of service results at the analysis intersection is presented in Table 7. Note that for signalized intersections, the delay presented represents the overall operation of the intersection, whereas the delay presented for an unsignalized intersection summary represents the delay for the stopped approach or movement. William Popp Associates Page8 Traffic Impact Analysis (5/25105) Fleuve des Voiles Table 7 Level of Service -2005 and 2007 PM Peak Honr with Project' SE 192nd St/124th Ave SE ' Peak Hour Peak Hour Time Frame LOS Delay Comments AM PEAK HOUR 2005 Existing B (14.9) northbound approach; shared. F (80.0) southbound approach; shared (private) A (<10.0) eastbound left tum. A (<10.0) westbound left tum. 2007 w/o Project C (16.4) northbound approach; shared. F (99.7) southbound approach; shared (private) A (<10.0) eastbound left tum. A (<IO.OJ westbound left tum. 2007 w/Project C (18.9) northbound approach; shared. F (103.0) southbound approach; shared (public) with Fleuve des Voiles, Cogger, and Trinity A (<10.0) eastbound left tum. A (<10.0) westbound left tum. F (62.9) Special; southbound approach; shared (public) with ONLY Fleuve des Voiles B (19.7) with signal and EBIWB left turn lanes (delay represents overall intersection delay) PM PEAK HOUR 2005 Existing D (31.6) northbound approach; shared. A (9.6) southbound approach; shared {private) A (<10.0) eastbound left turn. B (10.4) westbound left turn. 2007 w/o Project E (40.5) northbound approach; shared. A (9.7) southbound approach; shared (private) A (<IO.OJ eastbound left tum. B (10.7) westbound left tum. 2007 w/Project F (51.4) northbound approach; shared. F (62.0) southbound approach; shared (public) with Fleuve des Voiles, Cogger, and Trinity A (<10.0) eastbound left turn. B (10.6) westbound left tum. E (46.4) Special; northbound approach; with ONLY Fleuve des Voiles E (41.3) Special; southbound approach; shared (public) with ONLY Fleuve des Voiles C (24.3) with signal and EB/WB left turn lanes( delay represents uverall intersedl.on delay) Project; Fleuve des Voiles, 41 SFDU's. Also includes traffic from Cogger and Trinity Developments that could not use this access without Fleuvc des Voiles During the AM peak hour, the critical side-street approach is the southbound approach (from a private road without project) and is estimated to operate at LOS F during the William Popp Associates Page9 Traffic Impact Analysis (5/25/05) Fleuve des Voiles existing year and the horizon year with or without the project. For the existing condition and the future without project condition, there is only one trip exiting from the private drive during the hour (and turns left). The project will add 20 trips to the this approach with 55% turning right assuming there is a north connection through Trinity. The average delay increases approximately 3 seconds per vehicle with the project traffic; from 99.7 sec/veh to 103.0 sec/veh. However, this increased delay also represents traffic from the Cogger and Trinity projects. The eastbound and westbound left turns are estimated to operate at LOS A. Without the Cogger and Trinity developments, with only the Fleuve des Voiles project, the southbound approach delay actually improves approximately 3 7 sec/veh with addition of the project traffic; from 99.7 sec/veh to 62.9 sec/veh. Since the southbound right turn movement is general a low delay movement, the overall approach delay for this southbound approach (the southbound approach) actually improves with the project due to the delay weighting for each movement on the approach. With installation of a signal, as part of CIP 401004, the overall intersection LOS is estimated to be LOS B with an average overall intersection delay of 19. 7 seconds per vehicle. The worst approach is estimated to be the northbound approach with a LOS D and an average delay of 40. 7 seconds per vehicle. It is important to note that the geometric and signal operation assumptions including the following: • Two-lane approaches on the east and west legs; left-tum pocket and through-with- shared-right-turn for both approaches. • Single lane approaches on the north and south legs. • A four legged intersection with signal mast arms on all legs. • A three-phase fully-actuated signal with protected/permissive phasing for the eastbound and westbound left turn lanes. During the PM peak hour, the critical side-street approach is the northbound approach (from 124th Ave SE) and is estimated to operate at LOS D during the existing year and LOS E during the horizon year without the project. With the project plus the Cogger and Trinity developments, the southbound approach declines to LOS F. The southbound approach (private road without project) is estimated to operate at LOS A for the existing condition and the future without project condition. The LOS is estimated to worsen to LOS F with project plus the Cogger and Trinity projects. The Fleuve des Voiles project is estimated to add 12 trips to the this approach with 50% turning right. The eastbound left turn is estimated to operate at LOS A and the westbound left turn is estimated to operate at LOS B. Without the Cogger and Trinity developments, with only the Fleuve des Voiles project, the southbound approach LOS is E with an average delay of 41.3 sec/veh. The delay for the northbound approach is also LOS E with an average delay of 46.4 sec/veh. The LOS and delay for the side street approaches improves for two reasons: 1) The southbound right turn movement is general a low delay movement, the overall approach delay for this southbound approach (the southbound approach) actually improves with the project due William Popp Associates Page JO Traffic Impact Analysis (5/25/05) F/euve des Voiles to the delay weighting for each movement on the approach, and 2) the traffic passing through the Fleuve des Voiles project from Trinity is assumed to be to/from the southeast, thus adding traffic to the left and through movements in the southbound direction and the thru movement in the northbound direction, which are the more delay constrained movements. With installation of a signal, as part of CIP 401004, the overall intersection LOS is estimated to be LOS C with an average delay of24.3 seconds per vehicle. The worst approach is estimated to be the northbound approach with a LOS D and an average delay of 47.1 seconds per vehicle. It is important to note that the geometric and signal operation assumptions are as noted above in the AM level of service discussion Refer to the Technical Appendix for the volume breakdown and level of service calculation sheets. F. Queuing An analysis of queuing for selected movements at the SE 192"d St/I 24th Ave SE intersection was conducted. Queuing was reported for the 95th percentile condition. The 95th percentile queue implies that 95 percent of the time the queue will be equal to or less than calculated, and 5 percent of the time the queue will exceed the calculated queue. The findings are discussed below. At the SE 192"d St/I 24th Ave SE intersection, vehicle queuing was calculated for only the eastbound and westbound approaches. This would include the eastbound left tum lane, the eastbound through/right lane, the westbound left turn lane, and the westbound through/right turn lane. The calculated queue lengths for the 2007 AM and PM peak hours with project are presented in Table 8. William Popp Associates Page II Traffic Impact Analysis (5/25105) Fleuve des Voiles Table 8 Peak Hour Queuing Estimates ' Intersection/ Approach AM Peak Hour Eastbound Left Turn Lane Eastbound Through/Right Tum Lane Westbound Left Tum Lane Westbound Through/Right Tum Lane PM Peak Hour Eastbound Left Tum Lane Eastbound Through/Right Turn Lane Westbound Left Tum Lane Westbound Through/Right Turn Lane Queuing summaries at the SE 192nd St/124th Ave SE intersection. 2007 Peak Hour with Project Traffic b 95th Percentile Queue Vehicles' Length (ft)' 0.2 5 7.3 183 7.5 188 38.6 965 0.5 13 47.4 1,185 4.7 118 7.8 195 b Volume basis for queues include Fleuve des Voiles, Cogger, and Trinity. e Queue results obtained from the HCS outputs. d Based on 25 feet per vehicle. As shown in Table 8, for the 2007 peak hour with project traffic (plus Cogger and Trinity), the maximum 95th percentile queue for the eastbound left turn movement occurs during the PM peak hour and is estimated to be only 0.5 cars per cycle which equates to 13 feet. Of course, this is a calculated result. Adjusting for real world conditions, the maximum 95th percentile queue will be I vehicle or 25 feet for the eastbound left turn, occurring every other signal cycle. The eastbound through queue is estimated to be I, 185 feet during the PM peak hour. It is important to note that the area north of SE 192nd St in the 1241h Ave SE corridor is not anticipated to grow in the future, thus the eastbound left turn volume and queue estimates should be adequate for design purposes. G. Left Turn Pocket Warrant Analysis The analysis considered the need for an eastbound left turn lane on SE 192nd St during both the AM and PM peak hour periods. This analysis was conducted based on left turn storage guidelines from the WSDOT Design Manual, Figure 910-9a. The results of the analysis are presented in Table 9. William Popp Associates Page 12 Traffic Impact Analysis (5125/05) Fleuve des Voiles Time AM Peak Hour PM Peak Hour Total DHV 1 1,273 l,343 Table 9 Left Turn Lane Warrant Analysis Eastbound Left Turns During Peak Hour b Yeh % Lefts 4 14 0.3% 1.0% WSDOTCurve Warrant Threshold c Veh %Lefts 17 16 1.35% 1.17% 1 Total DHV: Total volume from both approach directions on SE 192nd St (2007 peak hour volume with project traffic). 2 Total future vehicles turning left into the site during the peak hour; includes Fleuve des Voiles, Cogger and Trinity. Warrant Met? No No 3 Warrant volumes based on WSDOT Design Manual Figure 910-9a for posted 40 mph speed. Warrant volumes shown are minimums. As shown in Table 9, an eastbound left turn storage lane on SE 192"d St is not needed per the WSDOT Left-Tum Storage Guidelines. The left turn warrant calculation sheet is attached. The analysis assumes the Cogger and Trinity projects are also developed, there is a connection between Trinity and Fleuve des Voiles, and some project traffic from each project passes through the adjacent project. However, due to the fact that a westbound left turn lane is being constructed on the opposite side of the intersection, it is good design practice that an opposing eastbound left turn lane be constructed as part of the same project. IV. Conclusions The preceding analysis was prepared to address issues identified by King County traffic engineering staff and to ensure adequate traffic operations are achieved for both the new site residents and the surrounding traffic. Based on the findings contained herein, the project impacts only warranted a traffic analysis of conditions at the SE 192°d St/124th Ave SE intersection. The following is a summary of findings of this study: • The project consists of 41 new single family dwelling units and is estimated to generate 392 average weekday daily trips, 31 AM peak hour trips and 41 PM peak hour trips. The estimate of 41 lots is likely a maximum count, and the actual number may be one or two less. • King County is proposing as part of CIP 401004 to construct a westbound left turn lane and signal at the SE 192°d St/124 th Ave SE intersection as well as new pedestrian amenities. This intersection is considered a High Accident Location, and according to King County, the intersection meets accident warrants for installation of a signal. • Since the current configuration of the SE 192"d St/124th Ave SE intersection includes 4 legs, it is assumed a new signal would include signal control for the north leg, even if it remains a private drive. William Popp Associates Page 13 Traffic Impact Analysis (5125/05) Fleuve des Voiles • There is adequate entering and stopping sight distance from the north leg at the SE 192"d St/1241h Ave SE intersection. However, this may be mute with the construction of a signal at this intersection. • During the AM peak hour, the southbound approach ( critical approach) level of service is estimated to be LOS F with or without the project. The LOS assumes impacts from Cogger and Trinity as well as part of the "with-project" scenario. It is important to note that withjust the Fleuve des Voiles project, the LOS delay actually improves for the southbound approach by approximately 37 seconds per vehicle. This is due to the fact the approach is a weighted result of lefts, throughs, and rights, and about 60% of the project traffic is right turn if there is no connection north through Trinity. Therefore, with addition of the project traffic, the north leg average approach delay has been improved beyond the pre-project condition, thus satisfying the LOS F mitigation requirements defined in the King County Intersection Standards. • During the PM peak hour, the northbound approach is critical. The level of service is LOS F with an average delay of 51.4 seconds per vehicle for the future with project scenario. The southbound approach is also LOS F. However, again as discussed in the AM discussion, with only the Fleuve des Voiles project, the northbound LOS is E with an average delay of 46.4 seconds per vehicle, and the southbound approach is LOS E with an average delay of 41.3 seconds per vehicle. • The level of service for the eastbound and westbound left turns is LOS A or B for the future with project scenario. • With installation of a signal and left turn pockets on the eastbound and westbound approaches, the level of service is B for the AM peak hour and LOS C for the PM peak hour. The northbound approach is the worst approach; LOS D. • For the future with project scenario, the eastbound left turn 95th percentile queue is estimated to be only 0.5 vehicles per cycle which occurs during the PM peak hour. Thus, the adjusted maximum queue is estimated to be 1 vehicle or 25 feet. • The westbound left turn 95th percentile queue is estimated to be 188 feet in the AM peak hour and 118 feet in the PM peak hour. It is assumed that the current County CIP 401004 design includes a 100 foot westbound left turn storage lane and a 50 foot transition zone. Assuming that storage can be utilized in the transition, the turn lane may be 30 feet short of what is required. This is all based on 2007 traffic forecasts. A 125 foot storage lane for the westbound left turn may be more appropriate. • Assuming there is an roadway connection (north/south) between the Fleuve des Voiles and the Trinity development, it is concluded that an eastbound left turn lane is not warranted per WSDOT guidelines. However, with the King County CIP project, it would be better design practice to include an opposing turn lane when the westbound left turn lane is constructed. The recommended minimum length of an eastbound left turn storage lane should be 50 feet. Transition tapers back to existing would begin past the 50 foot zone. Finally, the project has applied for transportation concurrency and received a certificate of concurrency for 43 single family lots. William Popp Associates Page 14 Traffic Impact Analysis (5/25/05) Fleuve des Voiles V. Mitigation Recommendations The mitigation recommendations for the Fleuve des Voiles residential project are as follows: • King County's Mitigation Payment System (MPS) is utilized to provide funding for transportation improvements. The county is divided into 456 zones for which a residential fee has been pre-calculated for each zone. This project is located in MPS Zone #342. The residential fee within this zone is $3,765 per single-family unit per the (latest) October 28, 2002 King County Mitigation Payment System Residential Fee Schedule ( obtained from www.metrokc.gov); not including administrative fees. Assuming there are 41 units, it is estimated that the MPS fee would be $154,365. • The project will be required to improve (per the King County Road Standards, Section 2.03) !24th Ave SE between SE 192nd St to the plat to public urban residential Sub-Access Street standards. This standard requires a pavement width of 24 feet plus curb and 5-foot sidewalk on one side. • An eastbound left turn lane does not meet warrants for required installation. However, due to the fact the County CIP 40 I 004 will construct a westbound left turn lane, it is recommended that a short opposing eastbound left turn pocket be considered as part of the CIP for better design and safer operations. • The Fleuve des Voiles project will certainly benefit from the installation of a signal at the SE 192nd St/124th Ave SE intersection. However, this signal will be constructed with or without the project and it is assumed it will be designed to accommodate all four legs. If the project were required to contribute towards the signalization improvement costs, it is recommended that the fee be based on the project's impact at the intersection. A fair-share percentage impact methodology results in a project impact of2.12% of the total traffic entering this intersection. This is based on traffic during the PM peak hour. William Popp Associates Page 15 William Popp Associates Transportation Engineers/Planners (425) 401-1030 FAX (425) 401-2125 e-mail: info@wmpoppassoc.com TECHNICAL APPENDIX FOR FLEUVE DES VOILES May 25, 2005 CONTENTS: .,' King County Mitigation Payment table .,' Traffic Growth at SE 192nd St/I 24th Ave SE .,' AM and PM Peak Hour Turning Movement Volumes ~ 2005 Peak Hour (existing) ~ 2007 Peak Hour without project ~ 2007 Peak Hour with project .,, HCS Level of Service Calculations ~ 2005 AM and PM Peak Hour (existing) ~ 2007 AM and PM Peak Hour without project ~ 2007 AM and PM Peak Hour with project ~ 2007 Signalized Scenario (AM and PM) .,' Left Turn Storage Guidelines Analyses 14-400 Building• Suite 206 • 14400 Bel-Red Road• Bellevue, WA 98007 (® King County llmrmllll llm.l'lll 4i§ht34W Comments Wi¥ik4,M Department of -r.. rt t" Pl. • Transportation 11anspo ·· a lQn ··· anmng King County Mitigation Payment System Residential Fee Schedule The multifamily residential fee shall be determined based on the appropriate single-family fee multiplied by 0.6. The residential MPS fee for any unincorporated area not listed within a zone on the King County residential fee schedule shall be $189. Effective October 28, 2002 I Zone IGI Zone 11~1 Zone IGJI Zone Fee G~G~G~I 85 $1082 G~GI s348 IG~I 90 \ $865 G~GI $2125 IG~I 115 $451 Ell s1018 l~~G~I 124 $130 G~G~G~I 132 $79 G~GI $4621 1~11$338011 1361 $4545 GI $4651 IGI $37771~11 $316411 140 11 $1910 GI $1741 IGI $1685 IGI $151711 14411 $791 G~G~G~I 148 $411 G~G~G[~~~JI 178 $18 G~G~G~I 182 $48 G~G~G81 187 I $43 ~~~~G~I 191 $69 G~~~~~I 196 $262 G~G~GI $1283 II 216 I $797 G~~~G~I 232 $166 ~~~~G~I 2361 $200 G~G~G~I 242 I $751 G~G~~~I 259 $651 G~~~~\$297511 265 $8891 GI $1581 [~I $1845 IGI $140211 269 $10821 GI $1020 IGI $1099 IGI $102311 273 $1161 I r--"11 1r--"1, 1r--"11 II II $2400 1 211 ii $1080 $558 1 281 11 $1689 ~I 28911 $378 1 $548811 29611 $7535 1 $647411 30011 $1925 1 $645511 3041 $1962 1 $605811 311 $1092 I $1581 11 3161 $2581 ~I 320 11 $1207 1 $229511 327 $1901 ~I 334 $1775 1 $640611 338 $5014 1 $336211 342 $3765 1 $375211 3461 $3959 1 $299711 350 $1669 1 $160611 356 $6951 ~II 363 $2562 I $277511 369 $2932 ~I 373 1 $497 ~I 377 $251 ~I 381 $1721 I $4880 11 385 $5843 1 $713611 389 $4819 I $382811 393 $4698 I $479911 397 $3061 I $2091 11 401 $1412 I $109311 405 1 $1124 1 $325311 409 $3031 I $369311 417 $2436 ~I 425 I $836 I $154711 431 $991 I $1540 11 435 $1328 I II ~I $22931~1 $1222 l~I $121311 Bl $2164 IGI $2918 IGI $212911 GI $1565 IGI $1675 IGI $213911 GI $15651~1 $449 IGI $14121 For more information contact: Richard Warren CIP and Planning Section Department of Transportation 201 South Jackson Street MS KSC-TR-0317 Seattle, WA 98104-3856 Phone: (206) 263-4713 Fax: (206)296-0566 440 II $45971 44911 $2750 I 45311 $14851 To find out what the MPS zone and fee is for your residential proposal, contact the King County Department of Development and Environmental Services (DDES), Building Services Division at (206) 296-6600. You can link to DDES property research at Parcel Search GlS Application, DDES to determine which zone your development is in. (NOTE: You will want to go to the advanced users site, enter a parcel number, address or intersection, then click on the districts button to see which ~S zone your development is in.) King County I News I Services I Comments I ~earch Links to external sites do not constitute endorsements by King County. By visiting this and other King County l/1.eb pages, you expressly agree to be bound by terms and conditions of the site. The details. I- C <( z 0 -I- (.) w en a::: w I-z - INTERSECTION ADT; TOTAL ENTERING TRAFFIC SE 192ND ST AT 124TH AVE SE 15000 .,........,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,....,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,........,.....,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,.......,..._, 14500 l i !' I' 14000 •- 13500 ,_ 13000 12500 I ~ 0------------------ ----<> t 12000 1992 1994 1996 1998 2000 2002· 2004 Year 1 SE 192nd St/124th Ave SE EBLT EBT EBRT WBLT WBT WBRT NBLT NBT NBRT SBLT SBT SBRT Count Dec-2002 AMPK 0 169 20 246 707 ~- I 9 0 187 - I --- 0 0 1340 Existing 2007 2005 Future AMPK Growth 0 0 182 11 22 I 265 16 761 46 I 0 10 I -- 0 0 201 12 I 0 0 0 0 0 1443 88 Flueve des Voiles SF Plat (41 lots) Background Trinity Cogger Project 2007 Plat Plat Fleuve AMPK 40 sfdu's 8 sfdu's 41 sfdu's 0 0 I 3 193 0 0 0 23 0 0 0 281 0 0 0 808 0 0 0 I I I 2 10 0 0 0 0 I 0 I 214 0 0 0 I 4 I 7 0 2 I 2 0 0 2 11 1531 8 6 26 2 SE 192nc SE 192nd St/124th Ave SE EBLT EBT EBRT WBLT WBT WBRT NBLT NBT NBRT SBLT SBT SBRT Count Dec-2002 PMPK 0 722 83 108 237 I -- 15 0 152 0 0 ---- 2 1320 Existing 2005 PMPK 0 777 --·----- 89 116 255 I 16 -- 0 - 164 0 0 2 1421 soos2.XLS, AM -PM Tums 9:49AM 2007 Future Growth 0 47 5 7 16 0 I 0 10 0 0 0 87 Background Trinity Cogger Project 2007 Plat Plat Fleuve PMPK 40 sfdu's 8 sfdu's 41 sfdu's 0 0 3 II 825 0 0 0 95 0 0 0 123 0 0 0 271 0 0 0 I 5 I 8 17 0 0 0 0 3 0 2 174 0 0 0 0 2 I 5 0 I I I 2 0 I 6 1508 II 7 33 Existing 2005 AM PK I I Horizon Yr 2007 771 1027 AMPK 203 384 4 193 286 211 23 Background 2007 AM PK I I 281 808 818 1090 5 216 408 10 304 224 2 Horizon Yr 2007 AM PK 214 31 11 ---·--~ 13 831 1094 -- 5 220 420 13 1571 309 226 Existing 2005 PM PK 2 I Horizon Yr 2007 273 373 PMPK 867 941 14 825 206 180 95 Backaround 2007 PM PK 2 I 123 271 290 395 -------···- 15 920 998 17 218 191 5 Horizon Yr 2007 PM PK 174 20 34 8 297 409 3 934 1006 ---- 9 1559 221 196 William Popp Associates © TWO-WAY STOP CONTROL SUMMARY General Information site Information 11\nalyst BPJ Intersection SE 192nd SV124th Ave SE i>.aencv/Co. Wm Ponn Associates lurisdiction ~ina Countv Date Performed 5126/05 "-nalvsis Year 2005; extg o.nalvsis Time Period dMPK Proiect Descriotion Soos Creek Plat; 41 SFDU's East/West Street: SE 192nd St North/South Street: 124th Ave SE Intersection Orientation: East-West study Period (hrs): 1.00 lfehicle Volumes and Ad ustments Maior Street Eastbound Westbound rvlovement 1 2 3 4 5 6 L T R L T R volume 0 182 22 265 761 1 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 0 182 22 265 761 1 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 :;onfiguration LTR LTR Uostream Siana! 0 0 111inor Street Northbound Southbound Vlovement 7 8 9 10 11 12 L T R L T R Jolume 10 0 201 1 0 0 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 10 0 201 1 0 0 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (%) 2 2 Flared Approach N N Storage 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delav, Queue Lenath, and Level of Service Approach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR V (vph) 0 265 211 1 C (m) (vph) 859 1380 575 49 vie 0.00 0.19 0.37 0.02 95% queue length 0.00 0.71 1.72 0.06 ~ontrol Delay 9.2 8.2 14.9 80.0 ~OS A A B F ~pproach Delay --14.9 80.0 ~pproach LOS --B F HCS2000™ Copyright O 2000 University of Florida, All Rights Reserved Version4.lc TWO-WAY STOP CONTROL SUMMARY General Information :site Information ~nalyst BPJ Intersection SE 192nd St/124th Ave SE saenc.v/Co. Wm Ponn Associates urisdiction Kina Countv Date Performed 5126/05 •nalvsis Year 2007; without oroiect ~nalvsis Time Period AMPK Proiect Descriotion Soos Creek Plat; 41 SFDU's East/West Street: SE 192nd St North/South Street: 124th Ave SE Intersection Orientation: East-West studv Period /hrs): 1.00 Vehicle Volumes and Ad ustments Malor Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R volume 0 193 23 281 808 1 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 0 193 23 281 808 1 '°ercent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Uostream Siana! 0 0 lllinor Street Northbound Southbound viovement 7 8 9 10 11 12 L T R L T R tolume 10 0 214 1 0 0 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 10 0 214 1 0 0 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (%) 2 2 Flared Approach N N Storage 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 ,onfiguration LTR LTR Delav, Queue Lenath, and Level of Service ~pproach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR V (vph) 0 281 224 1 C (m) (vph) 825 1366 539 39 v/c 0.00 0.21 0.42 0.03 95% queue length 0.00 0.78 2.11 0.08 ~onlrol Delay 9.4 8.3 16.4 99.7 LOS A A C F ~pproach Delay ---16.4 99.7 Approach LOS --C F HCS200(/rM Copyright C 2000 University of Florida, All Rights Reserved Yersion4.lc TWO-WAY STOP CONTROL SUMMARY General Information i::ite Information IAnalvst ~PJ Intersection SE 192nd Sf/124th Ave SE IIAnen~•/Co. Wm Pnnn Associates :furisdiction <ina Counrv Date Performed 5126/05 •nalvsis Year 2007; with oroiect 'nalvsis Time Period •MPK Profect Descrintion Soos Creek Plat; 41 SFDU's, a/us Conner & Trinitv East/West Street: SE 192nd St INorth/South Street: 124th Ave SE Intersection Orientation: East-West '"tudv Period lhrsl: 1.00 iehicle Volumes and Ad·ustments aior Street Eastbound Westbound ovement 1 2 3 4 5 6 L T R L T R "olume 4 193 23 281 808 5 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourty Flow Rate, H FR 4 193 23 281 808 5 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Unstream Sinnal 0 0 Mi nor Street Northbound Southbound Movement 7 8 9 10 11 12 L T R L T R "olume 10 2 214 13 5 13 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourty Flow Rate, HFR 10 2 214 13 5 13 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (%) 2 2 Flared Approach N N Storaae 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delau, Queue Lennth, and Level of Service ~pproach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR kl (vph) 4 281 226 31 C (m) (vph) 823 1366 485 67 f.1/c 0.00 0.21 0.47 0.46 95% queue length 0.01 0.78 2.57 2.29 Control Delay 9.4 8.3 18.9 103.0 LOS A A C F ~pproach Delay ---18.9 103.0 Approach LOS --C F HCS2000™ C.Opyright O 2000 University of Florida, All Rights Reserved Version 4.lc HCS2000" DETAILED REPORT General Information Site Information Analyst BPJ Intersection SE 192nd Sf/124th Ave SE Agency or Co. Wm Popp Associates Area Type All other areas Date Performed 5126/05 Jurisdiction King County Time Period AMPK Analysis Year 2007 with project Project ID Soos Creek Plat; 41 SFDU; with Co""er and Trinitv Volume and Tim/nri lnnut EB WB NB SB LT TH RT LT TH RT LT TH RT LT TH RT Number of lanes, N1 1 1 0 1 1 0 0 1 0 0 1 0 Lane group L TR L TR LTR LTR Volume, V (vph) 4 193 23 281 808 5 10 2 214 13 5 13 % Heavy vehicles, %HV 0 7 0 2 2 0 0 0 3 0 0 0 Peak-hour factor, PHF 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 Pretimed (P) or actuated (A) A A A A A A A A A A A A Start-up lost time, 11 2.0 2.0 2.0 2.0 2.0 2.0 Extension of effective green, e 2.0 2.0 2.0 2.0 2.0 2.0 Arrival type, AT 3 3 3 3 3 3 Unit extension, UE 3.0 3.0 3.0 3.0 3.0 3.0 Filtering/metering, I 1.000 1.000 1.000 1.000 1.000 1.000 Initial unmet demand, Qb 0.0 0.0 0.0 0.0 0.0 0.0 Ped I Bike I RTOR volumes 0 0 0 0 0 0 0 0 0 0 0 0 Lane width 12.0 12.0 12.0 12.0 12.0 12.0 Parking I Grade/ Parking N -6 N N 6 N N 2 N N 2 N Parking maneuvers, Nm Buses stopping, N 8 0 0 0 0 0 0 Min. time for pedestrians, G, 9.4 9.4 11.9 11.9 Phasing Exel. Left WBOnly EWPerm 04 NS Perm 06 07 08 G = 5.0 G = 5.0 G = 60.0 G= G = 25.0 G= G= G= Timing Y= Y= 0 Y= 5 Y= Y= 5 Y= Y= Y= Duration of Analysis, T = 0.25 Cycle Length, C = 105.0 Lane Group Capacity, Control Delay, and LOS Determination EB WB NB SB LT TH RT LT TH RT LT TH RT LT TH RT Adjusted flow rate, v 4 240 312 904 251 34 Lane group capacity, c 271 1035 732 1117 376 369 vie ratio, X 0.01 0.23 0.43 0.81 0.67 0.09 Total green ratio, g/C 0.62 0.57 0.67 0.62 0.24 0.24 Uni/om, delay, d1 12.1 11.1 7.4 15.3 36.2 31.2 Progression factor, PF 1.000 1.000 1.000 1.000 1.000 1.000 Delay calibration, k 0.11 0.11 0.11 0.35 0.24 0.11 Incremental delay, d2 0.0 0.1 0.4 4.6 4.5 0.1 lnmal queue delay, d3 Control delay 12.1 11.2 7.8 19.8 40.7 31.3 Lane group LOS B B A B D C Approach delay 11.2 16.8 40.7 31.3 Approach LOS B B D C Intersection delay 19.7 Intersection LOS B TWO-WAY STOP CONTROL SUMMARY r.eneral lnfonnation Site Information il:nalvst ~PJ Intersection . SE 192nd St/124/h Ave SE anen~•/Co. Wm Ponn Associates Jurisdiction Kina Countv Date Performed 5126105 "'nalvsis Year 2005; extn Analvsis Time Period ,_,M PK Proiect Descrintion Soos Creek Plat; 41 SFDU's East/West Street: SE 192nd St INorth/South Street: 124/hAve SE Intersection Orientation: East-West IStudv Period /hrs\: 1.00 Vehicle Volumes and Ad"ustments Maior Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R IVolume 0 777 89 116 255 16 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 0 777 89 116 255 16 Percent Heavy Vehicles 0 --0 -- tvtedian Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Unstream Sinnal 0 0 Minor Street Northbound Southbound Movement 7 8 9 10 11 12 L T R L T R •1olume 16 0 164 0 0 2 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 16 0 164 0 0 2 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (%) 2 2 Flared Approach N N Storaae 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 ~onfiguration LTR LTR Delav, Queue Lennth, and Level of Service Approach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR Iv (vph) 0 116 180 2 C (m) (vph) 1304 786 314 780 lv/c 0.00 0.15 0.57 0.00 95% queue length 0.00 0.52 3.81 0.01 Control Delay 7.8 10.4 31.6 9.6 Los A B D A !Approach Delay --31.6 9.6 Approach LOS ----D A HCS2000™ Copyright O 2000 University ofFlorida, All Rights Reserved Version4.lc TWO-WAY STOP CONTROL SUMMARY . General Information Site Information ~nalvst BPJ Intersection SE 192nd Sf/124th Ave SE •nen~tco. Wm pnnn Associates Jurisdiction "'inn Countv Date Performed 5126105 ~nalvsis Year 2007; without vroiect •nalvsis Time Period UMPK Proiect Descrintion Soos Creek Plat; 41 SFDU's East/West Street: SE 192nd St INorth/South Street: 124thAve SE Intersection Orientation: East-West IStudv Period (hrs): 1.00 Vehicle Volumes and Ad'ustments ~a ior Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R Volume 0 825 95 123 271 1 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourty Flow Rate, HFR 0 825 95 123 271 1 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR U=tream Sinnal 0 0 Minor Street Northbound Southbound Movement 7 8 9 10 11 12 L T R L T R Jolume 17 0 174 0 0 2 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 17 0 174 0 0 2 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade (%) 2 2 Flared Approach N N Storaae 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delav, Queue Lenath, and Level of Service pproach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR (vph) 0 123 191 2 le (m) (vph) 1303 750 290 771 le 0.00 0.16 0.66 0.00 5% queue length 0.00 0.59 5.23 0.01 Control Delay 7.8 10.7 40.5 9.7 LOS A B E A Approach Delay .. -40.5 9.7 !Approach LOS --E A HCS200(ffM Copyright C 2000 University of Florida. All Rlgbts Reserved Version 4.lc T'.'VO-WA Y STOP CONTROL SUMMARY -General Information ite Information L<lnalvst ~PJ Intersection SE 192nd Sl/124th Ave SE IIAnencv/Co. Wm Ponn Associates urisdiction Kina Countv Date Performed 5126105 nalvsis Year 2007; with oroiect 4 nalvsis Time Period 0 MPK Pro;ect Descriotion Soos Creek Plat; 41 SFDU's; with Conner and Trinitv EastNVest Street: SE 192nd St INorth/South Street: 124th Ave SE Intersection Orientation: East-West IStudv Period lhrsl: 1.00 "ehicle Volumes and Ad ustments Maior Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R Volume 14 825 95 123 271 15 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 14 825 95 123 271 15 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 ~onfiguration LTR LTR Unstream Sinnal 0 0 "inor Street Northbound Southbound iAovement 7 8 9 10 11 12 L T R L T R •101ume 17 5 174 8 3 9 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 17 5 174 8 3 9 0 ercent Heavy Vehicles 0 0 0 0 0 0 !Percent Grade(%) 2 2 Flared Approach N N Storaae 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delav, Queue Lent1th, and Level of Service Approach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR Iv (vph) 14 123 196 20 C (m) (vph) 1288 750 270 83 Ivie 0.01 0.16 0.73 0.24 95% queue length 0.03 0.59 6.72 0.93 Control Delay 7.8 10.7 51.4 62.0 LOS A B F F Approach Delay ---51.4 62.0 !Approach LOS ---F F HCS2000™ Copyright Cl 2000 University of Florida, All Rights Reserved Version4.lc HCS2000" DETAILED REPORT General Information Site Information Analyst BPJ Intersection SE 192nd Sf/124th Ave SE Agency or Co. Wm Popp Associates Area Type All other areas Date Performed 5126/05 Jurisdiction King County Time Period PMPK Analysis Year 2007 with project Project ID Soos Creek Plat. 41 SFDU; with Coaaer and Trinity Volume and Timin11 ln1Jut EB WB NB SB LT TH RT LT TH RT LT TH RT LT TH RT Number of lanes, N, 1 1 0 1 1 0 0 1 0 0 1 0 Lane group L TR L TR LTR LTR Volume, V (vph) 14 825 95 123 271 15 17 5 174 8 3 9 % Heavy vehicles, %HV 0 2 0 3 1 0 0 0 0 0 0 0 Peak-hour factor, PHF 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 Pretimed (P) or actuated (A) A A A A A A A A A A A A Start-up lost time, I, 2.0 2.0 2.0 2.0 2.0 2.0 Extension of effective green, e 2.0 2.0 2.0 2.0 2.0 2.0 Arrival type, AT 3 3 3 3 3 3 Unit extension, UE 3.0 3.0 3.0 3.0 3.0 3.0 Filtering/metering, I 1.000 1.000 1.000 1.000 1.000 1.000 Initial unmet demand, Qb 0.0 0.0 0.0 0.0 0.0 0.0 Ped / Bike / RTOR volumes 0 0 0 0 0 0 0 0 0 0 0 0 Lane width 12.0 12.0 12.0 12.0 12.0 12.0 Parking/ Grade/ Parking N -6 N N 6 N N 2 N N 2 N Parking maneuvers, Nm Buses stopping, N 8 0 0 0 0 0 0 Min. time for pedestrians, G 0 9.4 9.4 11.9 11.9 Phasing Exel. Left WBOnly EW Perm 04 NS Perm 06 07 08 G = 5.0 G = 5.0 G = 65.0 G= G = 20.0 G= G= G= Timing Y= Y= 0 Y= 5 Y= y = 5 Y= Y= Y= Duration of Analysis, T = 0.25 Cycle Length, C = 105.0 Lane Group Capacity, Control Delay, and LOS Determination EB WB NB SB LT TH RT LT TH RT LT TH RT LT TH RT Adjusted flow rate, v 16 1023 137 318 218 22 Lane group capacity, c 777 1172 231 1207 308 299 v/c ratio, X 0.02 0.87 0.59 0.26 0.71 0.07 Total green ratio, g/C 0.67 0.62 0.71 0.67 0.19 0.19 Uniform delay, d 1 5.9 16.6 25.4 7.1 39.8 34.9 Progression factor, PF 1.000 1.000 1.000 1.000 1.000 1.000 Delay calibration, k 0.11 0.40 0.18 0. 11 0.27 0.11 Incremental delay, d2 0.0 7.5 4.1 0.1 7.3 0.1 Initial queue delay, d 3 Control delay 5.9 24.1 29.5 7.2 47. 1 35.0- Lane group LOS A C C A D C Approach delay 23.8 13.9 47.1 35.0- Approach LOS C B D C Intersection delay 24.3 Intersection LOS C TWO-WAY STOP CONTROL SUMMARY -General Information ~ite Information IAnalvst "'PJ Intersection SE 192nd Sf1124th Ave SE 11 •nencv/Co. Wm Ponn Associates lurisdiction l<ina Counrv Date Performed 5126/05 •nalvsis Year 2007; with oroiect on/v 'nalvsis Time Period •MPK Proiect Descrlntion Soos Creek Plat; 41 SFDU's, no CO"""'· no T rinitv East/West Street: SE 192nd St INorth/South Street: 124th Ave SE Intersection Orientation: East-West IStudv Period (hrs l: 1.00 ~ehlcle Volumes and Ad'ustments aior Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R Volume 5 193 23 281 808 3 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 5 193 23 281 808 3 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Unstream Sinnal 0 0 Minor Street Northbound Southbound Movement 7 8 9 10 11 12 L T R L T R "olume 10 1 214 8 2 14 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 10 1 214 8 2 14 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade(%) 2 2 Flared Approach N N Storaoe 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delav, Queue Lennth, and Level of Service pproach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR Iv (vph) 5 281 225 24 le (m) (vph) 824 1366 506 86 Ivie 0.01 0.21 0.44 0.28 195% queue length 0.02 0.78 2.36 1.12 r.ontrol Delay 9.4 8.3 17.8 62.9 LOS A A C F pproach Delay --17.8 62.9 pproach LOS --C F HCS2000™ Copyright O 2000 University of Florida, All Rights Reserved Version 4.Ic TWO-WAY STOP CONTROL SUMMARY :.;eneral Information Site Information ,t1nalyst i;PJ Intersection SE 192nd Sf/124th Ave SE "oencv/Co. Wm Pnnn Associates lurisdiction <ina Countv Date Performed 5/26/05 o.nalvsis Year 2007; with oroiect onlv o.nalvsis Time Period ,_,MPK Proiect Description Soos Creek Plat; 41 SFDU's; no Cnnner, no Trinirv East/West Street: SE 192nd St North/South Street: 124th Ave SE Intersection Orientation: East-West Studv Period hrs): 1.00 i/ehicle Volumes and Ad"ustments Maior Street Eastbound Westbound Movement 1 2 3 4 5 6 L T R L T R "Olume 16 825 95 123 271 9 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourly Flow Rate, HFR 16 825 95 123 271 9 Percent Heavy Vehicles 0 --0 -- Median Type Undivided RT Channelized 0 0 Lanes 0 1 0 0 1 0 :onfiguration LTR LTR Upstream Sional 0 0 Minor Street Northbound Southbound Movement 7 8 9 10 11 12 L T R L T R Jolume 17 2 174 5 1 11 Peak-Hour Factor, PHF 1.00 1.00 1.00 1.00 1.00 1.00 Hourty Flow Rate, HFR 17 2 174 5 1 11 Percent Heavy Vehicles 0 0 0 0 0 0 Percent Grade(%) 2 2 Flared Approach N N Storaae 0 0 RT Channelized 0 0 Lanes 0 1 0 0 1 0 Configuration LTR LTR Delav, Queue Lenath, and Level of Service Approach EB WB Northbound Southbound Movement 1 4 7 8 9 10 11 12 Lane Configuration LTR LTR LTR LTR V (vph) 16 123 193 17 : (m) (vph) 1294 750 277 116 vie 0.01 0.16 0.70 0. 15 ~5% queue length 0.04 0.59 6.03 0.51 :ontrol Delay 7.8 10.7 46.4 41.3 LOS A B E E Approach Delay --46.4 41.3 ~pproach LOS --E E HCS2000™ C.Opyright O 2000 University of Florida, All Rights Reserved Version 4. lc WSDOT LEFT TURN STORAGE GUIDELINES (TWO-LANE, UNSIGNALIZED) WSDOT FIGURE 910-9a 40mph Total DHV 430 439 443 450 460 470 500 510 590 600 700 760 800 900 1000 1100 1200 X Total DHV 1200 1100 1000 900 800 700 600 500 400 300 % Lefts 25 24 23 22 21 20 15.5 15 10 9.5 6.5 5 4.5 3.5 2.5 2 1.75 y % Lefts 1.6 2.0 2.6 3.4 4.7 6.6 10.0 16.3 29.5 63.4 200 n/a; >100 100 n/a; >100 soos2.XLS. WSDOT Curve 5126/05 ' 25, • •• > 201 \ i5 15 '\ 0 ~ 10 .. ~ 5 .. See <L 1WARANT.XLS> for more information on these WSDOT curves Left-Turn Storage Guidelines (Two-Lane, Unsignalized) WSDOT Design Manual, Figure 910-9a (extrapolated data to the high side DHV) y = 249,316, 103.7030440ox·'""2271 . ~---R' = 0.99770546 j 0 -t--~~-+--~~....-,..~~ ........ ~~~-t--~~~~~....,...~~ ........ ~~~ ....... ~..........J 400 500 600 700 800 900 1000 1100 1200 1300 L Total DHV (peak hour) -~ • Data from Figure 910-9a, 40 mph curve --Best Fit Curve! y=C*X 3 C = 249,316,103.70 a= -2.66227681 PM PK Check DHV % LT's 1343 1.04% 1. 17% <threshold thus LT pocket needed; 1.17%<1.42% AM PK Check DHV % LT's 1273 0.31% 1.35% <threshold thus LT pocket not needed; 1.35%>0.47% William Popp Associates 425-401-2124 Taylor Engineering 1:t:_ .. _:JL,1, __ 'U:: :ei·: ,_,_~_!:i'0 ...;;: :+,"!"i:+±1, Consultants PRELIMINARY TECHNICAL INFORMATION REPORT TEC Project No. 294-JMA for Fleuve des Voiles and Cogger Plats King County Tax Parcel Nos. 619900-0220, -0240, 0241, & -0260 Subdivision File # A03P0286 LSUD File# L04P0002 Site Address: 12216 SE 192°d Street Rento~-ashin!fOD __ . = ____ ,0,-= · , · ·, 1--' , , / ---,_ ,~ " u . ,_" I r· i h \ ---I, I • 1 i , I I I I ' I I I.,' I .,,, JUN232005 /_:~ C f"l['JE<.: .~. __ ,__. Prepared by: Lorna M. Taylor, P.E. l~lcn Date: September 15, 2004 Revised: May 13, 2005 205 Front St. S • P.O. Box 1787 • Issaquah, WA 98027-0073 • tel. (425) 391-1415 • fax (425) 391-1551 • www.teccivil.com Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats Section 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Appendices Appendix A: Appendix B: Appendix B-1 : Appendix C: Appendix D: Appendix E: TABLE OF CONTENTS Description Project Overview ......................................... . Conditions and Requirements Summary .......... . Off-Site Analysis ......................................... . Flow Control and Water Quality Facility Analysis and Design ................................................... . Conveyance System Analysis and Design ....... . Special Reports and Studies ......................... . Other Permits ............................................. . ESC Analysis and Design ............................. . Bond Quantities, Facility Summaries, and Declaration of Covenant. .............................. . Operations and Maintenance Manual .............. . Figures Page Number 1 1 2 3 5 5 5 5 5 5 1. Technical Information Report (TIR) Worksheet 2. Site Location 3. Drainage Basins, Subbasins, & Site Characteristics 4. SGS Soils Map Off-site Analysis Drainage System Table and Map Drainage Complaint Analysis (previously submitted) Analysis and Design Maintenance Requirements for Privately Maintained Drainage Facilities -not included in this preliminary report Bond Quantities Worksheet -not included in this preliminary report Retention/Detention Facility Summary Sheet and Sketch Declaration of Covenant -not included in this preliminary report TEC Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats SECTION 1 PROJECT OVERVIEW This Technical Information Report is submitted to the King County DDES in accordance with the King County Surface Water Design Manual (KCSWDM). A Level 1 Technical Design and Information Report for Preliminary Plat Review, dated January 26, 2004, was previously submitted for the Fleuve des Voiles site; and portions of that previous report are referenced herein; however, the proposed plat has been significantly changed and this TIR addresses the currently proposed plat layout. The Fleuve des Voiles plat was submitted as the "Soos Creek Plat" on September 15, 2004. That plat layout has been modified and the drainage facilities resized to accommodate the revised layout and the additional adjacent Cogger Plat. This TIR addresses the development of both plat areas. The 6. 7 4-acre Fleuve des Voiles project site and 0.93-acre Cogger project site comprise 4 existing lots and are located at 12216 SE 192"d Street in Renton, Washington. The Fleuve des Voiles project proposes to subdivide three lots into approximately 39 residential lots, and the Cogger project proposes to subdivide the fourth lot into 8 lots, providing the required infrastructure, including access roads, water and sanitary sewer service, storm runoff collection, conveyance, detention and treatment, and erosion control for each plat during construction. Appendix A contains a Technical Information Report (TIR) worksheet for the projects (Figure 1), as well as a Site Location Map (Figure 2), Drainage Basins, Subbasins, and Site Characteristics figures (Figure 3a -3e), and a Soils map (Figure 4). More detailed site information is included in Appendix C with the existing and developed site runoff model data. SECTION 2 CONDITIONS AND REQUIREMENTS SUMMARY The following summary describes how this new project will meet the eight "Core Requirements" and the "Special Requirements" that apply: Core Requirements 1. Discharge at the Natural Location: The sites currently slope, steeply in places, to the east and the Soos Creek wetlands. The southernmost portions of the Cogger Plat property drain east along the north edge of SE 192"d Street in an ill-defined swale. There are no well-defined drainage paths on the site, and runoff occurs in a dispersed manner. The project proposes to detain and infiltrate or disperse all runoff from the developed portions of the property and to bypass and disperse off-site flows, which should adequately mimic existing conditions. 2. Off-Site Analysis: A Level 1 offsite analysis was conducted for these preliminary plats as described in Section 3. 3. Flow Control: Runoff from the sites will be controlled to meet the requirements of the KCSWDM. From the majority of the site in an infiltration/detention pond, and from the 1241h Avenue SE roadway in a combination detention and treatment vault. Discharges from both facilities will be to dispersion trenches. Appendix C contains the KCRTS input and output. 4. Conveyance System: The conveyance system will be sized to convey the 25-year storm without flooding and the performance during the predicted 100-year storm will be evaluated to ensure that significant flooding will not occur. (not included in this preliminary report) TEC Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats 5. Erosion and Sedimentation Control: Runoff from the grading and trenching construction areas will be contained by a temporary construction entrance, silt fencing and sediment traps/ponds in accordance with the KCSWDM during construction. The ESC facilities will only be removed once all exposed site surfaces have been stabilized. Other temporary erosion and sedimentation control measures will be installed as needed. (not included in this preliminary report) 6. Maintenance and Operations: The treatment pond, combination detention and treatment vault, and detention/infiltration pond should be maintained as described in Appendix D, which includes the KCSWM Maintenance Requirements for Privately Maintained Drainage Facilities. (not included in this preliminary report) 7. Financial Guarantees and Liability: The bond quantities worksheet is included in Appendix E. (not included in this preliminary report) 8. Water Quality: Treatment of runoff from the 124'" Avenue SE roadway will be provided in a permanently wet volume in a combination detention/treatment vault and the runoff from the remainder of the site will treated in a dedicated wet treatment pond, both of which were sized according to the KCSWDM for Basic Water Quality Treatment. Appendix C contains the calculations used to size the treatment facilities. Special Requirements 1. Other Adopted Area-Specific Requirements: The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The detention and infiltration facilities are both located at the base of the hill and will discharge via dispersion to a Level 1 Flow Control area. Appendix A contains King County mapping to support this. 2. Ftoodplain!Floodway Delineation: Not Applicable. 3. Flood Protection Facilities: Not Applicable. 4. Source Controls: Not Applicable. 5. Oil Control: Not Applicable. SECTION 3 OFF-SITE ANALYSIS A formal off-site analysis was not conducted for this project because the project proposes to entirely infiltrate stormwater runoff on-site. However, the emergency overflow path downstream was documented and the County's Drainage Complaints File was again solicited to make sure no additional pertinent drainage complaints have been lodged since the original Drainage Complaint Analysis, dated March 20, 2004, which was produced for the project by Jacques Consulting. Task 1. Study Area Definition and Maps The figures in Appendix B show the extent of the study area and the local topography. The Site Plan drawing shows more detailed topographic information on the project site. Task 2. Resource Review Agency mapping was reviewed and TEC contacted King County regarding documented drainage complaints in the vicinity. The SCS soils map identifies site soils in the proposed development area as Alderwood Gravelly Sandy Loam, 0 -6% slopes and 15 -30% slopes. 2 TEC Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats Task 3. Field Inspection In accordance with the KCSWDM, the existing site and off-site drainage systems were inspected on June 15, 2004. Task 4. Drainage System Descriptions and Problem Descriptions There is only one report of a drainage problem in the immediate vicinity of the project. This complaint involved a plugged driveway culvert across 1241 " Avenue SE at SE 192"d. and the problem has been corrected according to the previously submitted Drainage Complaint Analysis by Jacques Consulting, dated March 20, 2004 (see Appendix 8-1). The fact that the project proposes to detain all site runoff means that the project won't exacerbate any existing problems downstream. The County's drainage complaints file was solicited again more recently, and the results of this search are included in Appendix 8. No additional pertinent drainage complaints have been logged in the interim. If the proposed drainage system were to fail, and the detention/infiltration facilities were to flood, the emergency overflow path for runoff would be into the adjacent Soos Creek wetlands. These wetlands feed Soos Creek, which flows south on the King County-owned property to the east of the project property. Task 5. Mitigation of Existing or Potential Problems To mitigate any water quantity impacts from the project. detention and infiltration of runoff is proposed meeting Level 1 flow control requirements in accordance with the King County Surface Water Design Manual (KCSWDM). Water quality impacts will be addressed in two Basic Water Quality treatment facilities; a dedicated treatment pond and a combination detention and treatment vault. The pond will treat runoff from the site, and the vault will treat runoff from 124th Avenue SE. SECTION 4 . FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The following subsections describe the measurements and criteria used to size the infiltration and treatment facilities. Existing Site Hydrology (Part A) The drainage on the existing site was analyzed for this project with KCRTS. Figures provided in the KCSWDM and KCRTS manual were used to determine project location and scale factor parameters. The figures in Appendix C show the delineation of the areas generating runoff on the site. The site soils are classified Alderwood Gravelly Sandy Loam, either O -6% or 15 - 30% slopes. Appendix C also contains the data and output from the hydrologic analysis. The following table lists the existing site conditions identified for this project and used in the KCRTS modeling included. Area (ac) Descriotion (Site) 11241" Ave SE) Forest 5.77 0.09 Impervious 0.38 0.16 Grass 1.08 0.09 Total Area 7.33 0.34 3 TEC Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats Developed Site Hydrology (Part B) The proposed drainage systems will route "site" runoff to a Level 1 detention/infiltration pond, and 124'" Avenue SE runoff to a Level 1 combination detention and treatment vault, both of which will route outflow to a dispersion trenches draining to the adjacent Soos Creek wetlands. The developed site conditions identified for this project and used in the KCRTS modeling included: Description (Site) Area (ac) 1124th Ave SE) Forest 0.00 0.00 Impervious 4.91 0.33 Grass 2.42 0.01 Total Area 7.33 0.34 Performance Standards (Part C) The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The infiltration facilities are both located at the base of the hill and will discharge (via subsurface flow) to a Level 1 Flow Control area. Conveyance features will need to be sized to convey the 25-year developed runoff and their performance during the 100-year event should be checked to be sure that significant flooding would not occur as a result. Flow Control System (Part D) The detention/infiltration pond and detention portion of thevu..i,,,l+ were sized using the KCRTS routine. The following table summarizes the sizing requirements for the infiltration pond and tank. Detention Facilities Site Pond 124th Ave. SE Vault Required storage volume 28,892 cf 1,011 cf Effective storage depth 4 ft 2 ft Top area@ 1' freeboard 9,637 sf 505 ft Bottom area 5,738 sf 505 ft Vertical oermeabilitv 60 min/in O min/in Descriptions of the procedures used and calculations and computer output are included in Appendix C. Water Quality (Part E) Runoff from the entire site and 124'" Avenue SE will be treated in two separate wet treatment facilities sized for Basic Water Quality Control, prior to infiltrati_on or dispersion. The following table summarizes the sizing requirements for the infiltration pond and tank. Treatment Facilitv Site Pond 124th Ave. SE Vault Required wetpool volume (Vb) 25,731 cf 1,538 cf Wetpool depth 8 ft 4 ft Too area 5,450 sf 385 sf 4 TEC Preliminary Technical Information Report Fleuve des Voiles & Cogger Plats SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 6 SPECIAL REPORTS AND STUDIES Several studies and reports were conducted and produced for this project and are available under separate cover as listed below. 1. Wetland Evaluation and Delineation Report prepared by H & S Consulting, dated May 13, 2004. 2. Traffic Impact Analysis prepared by William Popp Associates, "Draft" dated May 27, 2004. 3. Geotech Report prepared by GeoTrends, Inc., dated March 20, 2004. SECTION 7 OTHER PERMITS No other permits beyond those required by King County are anticipated to be required for this project. SECTION 8 ESC ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantities: Not included in this preliminary report. Facility Summaries: The County's Facilities Summary Sheet is included in Appendix E. Declaration of Covenant: Not included in this preliminary report. SECTION 10 OPERATIONS AND MAINTENANCE MANUAL Not included in this preliminary report. 5 TEC APPENDIX A FIGURES 1. Technical Information Report (TIR) Worksheet 2. Site Location Map 3. Drainage Basins, Subbasins, & Site Characteristics 4. SCS Soils Map King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Address &f39 Afr;? ,/eall/, 1 Wit i/f/11 [ Project Owne(!),~~ Phone -ztJ G -(24 ~ft/fl ~ Subdivison D Short Subdivision D Grading D Commercial D Other Community Drainage Basin D River D Stream D Critical Stream Reach D Depressions/Swales D Lake R Steep Slopes if()?., Location 7 Township Z3 N Range fE Section ~33-~--- D DFWHPA 0 Shoreline Management 0 COE404 0 Rockery 0 DOE Dam Safety 0 Structural Vaults 0 FEMA Floodplain D Other D COE Wetlands D Floodplain D Wetlands D Seeps/Springs D D D High Groundwater Table Groundwater Recharge Other Figure 1 TIR Worksheet (3 pages) Soil Type 1198 Slopes 0-6CJ!o Erosion Potential Erosive Velcoties ~ Additional Sheets Attached {:£..e.. {]e,,k.c~ /?ej'orf (.J.,y/Jv Je;;~ UJv-.ir REFERENCE ~ Ch. 4 -Downstream Analysis D D D D D D Additional Sheets Attached MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION 0"'sedimentation Facilities E( Stabilized Construction Entrance t'.'.f Perimeter Runoff Control P, Clearing and Graing Restrictions ef Cover Practices rf. Construction Sequence D other LIMITATION/SITE CONSTRAINT MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION Er Stabilize Exposed Surface I'.'(" Remove and Restore Temporary ESC Facilities ~Clean and Remove All Silt and Debris CJ"' Ensure Operation of Permanent Facilities ~Flag Limits of SAO and open space preservation areas D Other D Grass Lined D Tank Channel B"'vault ~Pipe System D Energy Dissapator D Open Channel D Wetland Wory Pond D Stream ~Wet Pond Facility Related Site Limitations Reference Facility D Cast in Place Vault g,--Retaining Wall D Rockery > 4' High Q-'structural on Steep Slope D Other Limitation B'lnfiltration D Depression D Flow Dispersal D Waiver D Regional Detention D Drainage Easement D Access Easement Method of Analysis JI (121>. ~ve I L Compensation/Mitigati on of Eliminated Site Storage 0" Native Growth Protection Easement D Tract D Other I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is accurate. MapQuest: Maps: print ~ Send To Printer Back to Map I 12216 Se 192nd St ' Renton WA ' 98058-7526 us I Notes: I -···················-·······--··························-····--····- I .................................... I This map is informational only. No representation is made or warranty given as ti MapQuest and Its suppUers assume no responslbility for any loss or < Privacy Policy & Legal Notices© 2004 MapQuest.com, Pagel ot 1 Figure 2 Site Location Map No Scale 0/1 A/'"J{"\(),i Map vmpm rage 1 u1 1 ®King County News 4i#iiii4¥ Comments Ill fil1ill Legend Selod<>d P•=m llakas and La,g<1-.S J -· Coun\y 8<>und,uy .l./ Sttta:an:a , sw•u:. IE i(Jng (;;runfy <,W<l,W -~- '; -0 Pa""9lB ~ /'/ 'fcOP<l t:,,<lh),.. (!lfti .f•./ ""'" e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, tim.eliness, or rights to the use of such information. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. sale of this ma or information on this ma is rohibited exce t b written ermission of Kin Coun . King County I GIS Center I News I Services I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. Figure 3a Drainage Basins, Subbasins, & Site Characteristics Scale as shown Map Output (e}tcing County • -CTJ:1.1nty &iut1datt l . -:S.tl'i:IB'h;. p/: ~.l>"! )"',/ ~w,.._ ~: n L.,,J P~roo~ ~ F~and Ottll liAO Slmm, I/ c~~t <'M-;,2~·~:;t ,ff a..,>.4 2 u,,.v..w-.1 .. ../ ~~-j Ci4Gk¥M Legend u,...,~ ·""' l~<ge ru.,;« S·Y"i'ffl?t.. fluod-.\i:!Y 100 ,,.,,.,AM<Jµla1n 'tM.RO C'har1twH Mgmtkm :Hazaru Att:::a$. m M-00€81.TE Ill -%'&~ m SAO W.tload ~ SAO Landi<fid• ~ SAO SEIW'me SAOE.ro,!Saim tatid~,s H:an-l'rl 0:21fl..i.ge Ama 1_,:::w11} Page 1 of 2 Comments e infonnation included on this map has been compiled by King County staff from a variety of sources and is subject to change w~hout notice. King County makes no representc implied, as to accuracy, completeness, timeliness, or rights to the use ot be liable for any general, special, indirect, incidental, or conseque o, lost revenues or lost profits resulting from the use or misuse of the sale of this ma or infonnation on this ma is rohibited exce t b• King County I GIS Center I News I Services I Cc Figure 3b Drainage Basins, Subbasins, & Site Characteristics Scale as shown Q /1 ~n /)/).1 I i I ____ l_/ I _J ·----1 1 ,------1 I ' i 1--· - I • Figure 3c Drainage Basins, Subbasins, & Site Characteristics Scale as shown ---------------------------------- ·+ ~~ co N 0 Cf) a.z 8w <!.. Cf) I I I I I I I ~-------------------· ----·-·--- ------------------------------------------ l I Figure 3d Drainage Basins, Subbasins, • -' _ & Site c_ haracteristics 111 Scale as shown -&AWi I -____ ---~ I"-'! I~ C ... !I) Qc -· :::J en m CJ) ;:;, (C () (ll (ll ~ (') Cil :!! DI (ll ::r Ill tC ., !I) (I) (I) ., -· C: !I) :::J .., Ill (I) CD ::r (') • 0 ct en <,.) :E :::!. c: CD :::J (I) C' e. C" (') !I) (I) (I) -· :::J .cn A03P0287 HYDRO & GEO ra.:- • 'OSllNE6 ~SECLINES °NTWPLIM:.S NS1r""i. ii~~m ~r '·,, u :".:i'.'.: SAO Wettat,,J C2'.I SAO l...orro:Wk/a 5BSAO~Mloe ~ 5.40 Sel.vnc c:::::JSAO~ w--m WLRD Dnil:nage ~ ' ., P9.rqja i"""'J/o',;','"'" ....... WOFW2 OJI: TRUS.1 WDPN2 OR TREESl ,......, FEMA Cn:,,u. ~ee-tlOOr. FEMA- FiMA 100-yr Fklodpl1ln c ... N City BOUOIIW'\tn 0 ,00 1000 ,:~ 1 JJJ tee! ® King County 1500 f~t n-1~1-..... -~--~~ 1Qr.aea...-y.i.ll,-.,,n11«yot~,r,dllt,...q,o<.itc ~ """'"°" ,._ ~ Co.,tt,,--..,., ~"'--1-.--... ~-1<>,r. -....... ~-~""Vti1ga-. ..... o.- ' aldl rnrmo-. Kn; Cou"J .... ""' i.. ..,.. f9f ~ . ~..-...lr'IIMd,.IIDCMllllll.•-...:1 ........ ........ ~DulnDlfilMNIQ._......._,,,.,. pn,tb-' .......... -... 0, ,.. __ ... i,., ~ -.....'"' ... ,,_ N'1-ol.ll'III.._-~ ::;._...,.~ ........ 111-~•,.; ..... I PROJECT St7E So,L::: //glllJJ1i> A1: AL.fJ€/wD01J , .~.: CVA~ ~ Lt>Allf ll: O -b i Sl.L\Pe;:S D=tr-5'o% SL.DJ"£$ ·,1 Figure 4 SGS Soils Map 1" = 2,000' APPENDIX 8 OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE AND MAP Basin: Soos Creek OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Subbasin Name: Subbasin Number: ii~~llill1~!iiiiti!iifffl\liii 1 i1:i ili![,tlfii1iliiil••11~-~ililliiii !llli~~l!lilllill A-B Sheet flow and sub Soos Creek grassy surface flow wetland area B-C Wetland/stream/ I Soos Creek grassy channel flow, wetland area approx. 150' wide C-D 48" culvert Crossing 192nd D-E Stream Soos Creek 984\inB04 2% -I O' -350' 3% 1 % -I 350· -550· 2% 1550' -650' 0.5% -1650' - 1% 2,650' + I None noted I None noted None noted Wet marshy area, relatively inaccessible Wet marshy area, relatively inaccessible This culvert was not visible at the time of the inspection, but according to the previous downstream analysis, has conveyed 100- year flows without floodin,, .. Creek flows in a wide wetland area. map VutpUL @)King County -Home Off-site Analysis Drainage System Map (Downstream Drainage Path) Scale as shown News Setvices Comments Sea,ch httn:l/www5 _ m errnkc. ,,, l\'/Serv Jet/com .P-,sri _esriman_ Esriman ?Si,rvici,NamP.=ovi,rviP,w&-Cli" .L a..5\.J .l V.l .J. CJ/14/7004 Phone t Kill cuimty wate, 111111 land RellOUl'lllS llli8ion -lrai18ue sarvas • foxt4-25_ 3 ~/551 Cln•t Saarch Printed : 9/W2004 1 :37:24 PM CQlalrt lYJIII TYIII of Prllm• AM'III of Pl'lb1811 --lll'll8Pu ••r f.1111 1976-0110 C DRNG 13038 SE 188TH PL @BLVOLN 686G2 1977-0072 C FLOG 12202 SE 192ND ST 686F2 19n-0014 C FLOG 13210 SE 192NDST FILL/DRAIN WAY eeeG2 1978-0080 C PONDING 19248 121STPL SE EAST OF 9ENSON HWY 686F2 1978-0081 C DRNG 19248 121STPLSE 686F2 1981-0225 C FLOG 13210 SE 192ND ST CRAIN WAY FILLED 686G2 1982-0539 C FLOG 12600 SE 192ND ST EAST KENT AREA 686F.2 1984-0313 R FLOG 13250 SE 192N0ST TO ROADS OIV.4 686F.2 1964-0314 C FLOG 13250 SE 192N0ST SE 192ND ST/134TH AVE SE 686F2 1985-0534 X DRNG 13250 SE 192NDST L TR TO OOMPLAINT 686G2 1966-0617 C DRNG 1~432 SE 187TH ST FLOG ON SIDEWALK 686G2 1988-0816 C FLOG 13440 SE 192ND ST REF:86-0832 NESPER 87-0770 686G2 1986-0616 ER FLOG 13340 SE 192NDST (REF:86-0632 NESPER) PVT PROB. 686G2 1986·1278 CL CLAIM 1110373 686G2 1987-0770 . C FLOG 1UIO SE 192ND ST Fit.lRWOOD SEE 86-0816 686G2 1967-1049 C TO RO COORD 04127~7. 686F2 1986-0118 X DRNG 13250 SE 192ND ST SEE ee-1278 NESPERICL • FORSEST TRAI 686G2 1968-0238 C FLOG 18431 120THAVE SE NEW DRIVEWAY WILL IT FLOOD 686F2 1988-0238 ER PIPE 18431 120THAVE SE NEED EXTENSION OF 42'" CULVERT 15861'2 1988-0305 C SLOa<AGE 12716 SE 18STH PL EASEMENT-FAIRWOOOIWALL CONSTRUC 686G2 1989-0003 C DRNG 18612 120THAVE SE INCREASED RUNOFF/CHANNEL 686F2 1089-0192 C DRNG 18612 120THAVE SE X PIPE NOT WORKING 686F2 1989-0550 C EROSION 19118 130THAVE SE OLD EASEMENT CHANNEL MAINTENANCE 686G2 1989-0665 C DRNG 13306 SE 184TH PL WATER IN BASEMENT/YARD DRAIN CLOG 686G2 1990-0056 C FLOG 12700 SE 187TH PL UTILITY EASEMT CLOGGED 90-0259 686G2 1990-0259 C FLOG 12700 SE 187TH PL M DITCH OVERFLOW 686G2 1990·1106 C DRNG 13517 SE 189TH PL CULVERT et.EW TRASH RACKI CEDAR ES 686G2 1990-1106 NOA ORNG 13517 SE 169TH PL CULVERT BLEW TRASH FI.ACW CEDit.R es 686G2 1990-1155 C DRNG 13421 SE 189TH PLACE 13517 se 189TH PL 686G2 1990-1155 NOA DRNG 13421 $E 189TH PLACE REF 90-1106 686G2 1990-1156 C DRNG 13429 SE 189TH PLACE 13517 SE 189TH PL 686G2 1990-1156 NDA ORNG 13429 SE 189TH PLACE REF 90-1106 686G2 1990-1157 C ORNG 13435 SE 189TH PLACE 13517 SE 189TH PL 686G2 1990-1157 NOA DRNG 13435 SE 189THPLACE REF 90-1106 686G2 1990-1158 C DRNG 18917 SE 189TH Pt.ACE 13517 SE 189TH PL 686G2 1990-< 158 NOA DRNG 18917 SE 189TH Pt.ACE REF 90-1106 68EIG2 1990-1159 C ORNG 13523 SE 18STH PLACE 13517 SE 189TH PL S66G2 Page, of J CGrlplml : rnu of l'l'llllllai Ml1'8111 of !'1'11111111 Glrmll8 1lm1'111 Nu111• 1990-1159 NDA DRNG 13523 SE 189TH PIJICI: REF 90·1100 686G2 1990-1160 C DRNG 13529 SE 189TH PLACE 13517 SE 189TH PL 686G2 1990-1160 NDA DRNG 13529 SE 189TH PLACE REF 00-1106 686G2 1990-1630 C FLOG 19114 130THAVE SE STREAM OVERFLOW 688G2 1991-1090 C DRAINAGE 18532 131STAVe SE WATER PONDS IN YARD 68SG2 1991-1090 NOA DRAINAGE 18532 131ST AVE SE YARD PONDS 686G2 1991-1090 SR DRAINAGE 18532 131STAVE SE TOCIP 686G2 1993-0641 wee SEDIMENT 13120 SE 192ND ST SS6G2 1994-0676 woe GREENH20 se 192ND & 134TH A SE DUCKWEED 688G2 1995-0170 woe OIL/CARS 19312 133RDAVI: SE RESIOENTIAL CAR MAINTENANCE 689G2 1995-0374 C FILLING SE 192NO & 134TH SE WETLAND· REFD TO ODES 68SG2 1996-0391 FCR PONO? 19118 130TH PL SE HOLD-GPR WILL CALL HER 4 MORI: oeTAI 686G2 1996-0391 NOA POND? 19118 130TH PL se HOLD·GPR WILL CALL HER 4 MORI: 01:TAI 686G2 1996,,0391 R POND? 19118 130TH PL SE HOLD-GPR WILL CALL HER 4 MORE PETAi 886G2 • 1996-0480 C CRKFLOS 13607 SE 192ND ? GROUNOWATER IMPACT WATER POND! S86G2 1996-0921 FCR RID POND 13341 SE 195TH ST OUTLET PIPE OBSTRUCTED ASSESSMEN 6BSG2 1996-1428 C SWALE 18914 129TH PLACE SE OFFSITT: FLOW IMPACTING PVT ORNG SY 68602 1996-1428 NOA SWALE 18914 129TH PLACE SE OFFS1TE FLOW IMPACTING PVT DRNG SY 6S6G2 1996-1428 R SWALE 18914 129TH PLACE SE OFFSJTE FLOW IMPACTING PVT DRNG SY 686G2 1996-1550 C ORNG 19121 124THAVE SE PLUGGED ONV CULVERT IMPACT TO PVT 6S6F2 1996-1894 C RUNOFF 13416 Se 1anH WATER OVER SIDEWALK GROUNDWATI: 686G2 1997-0940 C ORNG 13007 SE 1811TH PL GROUNDWATER/SHEl:TFLOW PONDING 688G2 1997-1179 C DRAINAGE 19113 121ST PL SE :NSTALLATION OF DRNG IN FWJ OLD/OFF 886F2 1997-1179 NOA DRAINAGE 19113 121ST PL SE INSTALLATION OF DRNG IN R/W OLD/OFF 686F2 1997-1179 R DRAINAGE 19113 121ST PL SE INSTALLATION OF ORNG IN RN/ OLD/OFF 686F2 1997-1301 C DRAINAGE 19125 121ST PL SE SUBSTANDARD INSTL Of DRNG SYS PVT 686F2 1997-1319 FCR DUMPING 21709 146THST E DUMPED BATTERY IN RIO PONO 68602 1998.¢926 C DRAINAGE 19133 121ST PL se APPARENT OBSTRUCTION IN ROAO ORN 685F2 1999-0174 FCR CLGINLET 13415 SE 187TH PL INl..eT PIPE APPARENTLY beSTRUCTED 686G2 1999-0449 C SPRINGS 13518 SE 186TH PL NEW SFR GROUND WATER INFIL ONTO P 686G2 1999.¢632 C EASEIIIENT 19114 130THAVE SE INFO PROVIDEO AeDUT RID POND ON PR 688<32 1999-0679 FCR FENCE 18932 133RDPL SE LeANING Fl:NCe NEEDS REPAIR 686G2 2000-0398 C DOM 1262~ SE 192ND ST REQUEST TO DIVERT FLOW DISCHARGIN 688F2 2000.¢735 FCR MNM 1GOOO 134THAVE SE CEDAR BOARD FENCE' AROUND PERIMET e86G2 2001-0548 WQP WQP 13120 SE 192NDST 68002 2002-0094 Fl REM 13055 SE 1G2NOST SWM#83 REMEASURE OF ORIGINAL 17.7 1586G2 2002-0094 FIR REM 1J055 SE 192NDST SWM#83 REMeASURE OF ORIGINAL 17.7 S86G2 2002-0204 FCR MMG 19000 134TH AVE SE 1) PSE UTILITY BOX DAMAGED. CALLEO 686G2 2002-0424 C DOM 13003 SE 1e8TH PL SINKHOLE CEVELOPED APPARENT!. Y 0V 686G2 2002-0424 NOA· DOM 13003 SE 188TH PL SINKHOLE DB/ELOPED APPARENTt. Y OV &l6G2 Page 200 Elilllllallt : fYII of Prublll Altlrffl of Prabll• C.11118 ~1'1111 ,...,. 2002-0424 R DOM 13003 SE 1SSTH PL SINKHOLE DEVELOPED APPARENTLY OV 68602 2003·0266 C DDM 18759 130THAVESE LOCAL PONDING PROBLEM. MAY BE THE 686G2 2003-0545 WQR WQB 18601 126TH PLSE 6S6F2 2003-0762 WQA WOAI 19433 VASHON HWY SW BMPS are ALL IN PLACE 686F2 2003-0909 WQC WQDR 18601 126TH PL SE AUTO FLUID RESIDUE ON STRSET AS A R 686F2 Map Uutput @)King County ' 1 \ · floma ragt: 1 01 1 News Comments Information Plannin e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such informa1ion. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages ir,cluding, but not limited o, lost revenues or lost profits resulting from the use or misuse of the informatior, contained on this map. sale of this map or information on this ma is rohibited exce t b written ermission of Kin Coun . ........ -,., Kinq County I GIS Center I News I Services I Comments I SearQ!-1 By visiting this and other King County web pages, you expressly agree to be bound by tem1s and conditions of the site. The details. • I I, 33 = 10'-I 111 ;::. '53o 1 Q/1'1/?MLl Map UUlpUL .l a.c,c..-.l Vl l ®King County <:ommeots iMAP -Stormwater '------i---------1\1:;r".d:X):·:t :.-~-j:1 · ·:;;-_\\·:~:-~)~ __ --:; ::·~---r~~::;)l \ \ \\, \_ ~f-~l\,,, \ . r~ fc-;,; '.;j~'.fl[lr;~r~'ifj \-cc CJ~ ;~:[( -.-~ I) i · --~ 'L ' , ., ! "•-.' ! , , ·--•-,::::-_,._ , ---,-,--.•. ARE.fJ lli!/d, 70 J1, ,tft. \. i ,,\; : ~ ~ :. .r-·. -'. .,,.<',,. . .--. J·-(" .)..; ~ · .. · ·. ' .. u,; . .\..:+··-. .:.:-f' i" i :.<t D. '""" ..-A ·: \ ,: tu.L •' : , ! -. . ,4,---,--1, ·, . .' ; , ,,_ ,· _;I 5. -I-> DO;ic --·-~: . -~ ' '·-; --------·--·--·'"'-· ... , "\""''"""' ·¥-'. . ~ ' f i , : I \' •• : )-; : , < -~ <, • _ .. __ ,;;;( ; , , Y•, i_/1 pg S,d,r;,i~ P~ff:k.~ 1 -• C(a.JMY ~·)"dt'ld~fy' D K<>O County o,,,;,age 11a21r,£ :StftHHS ~!;,,px1r, A~~ ~id Legend t".I ..... : . e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or lost proms resutting from the use or misuse of the information contained on this map_ sale of this ma or information on this ma is rohibited exce t b written ermission of Kin Count King County I GIS Center I News I Services I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. Off-site Analysis Drainage System Map (Drainage Basin Trib. Area) Scale as shown " I I ~ '!t30 ' 0/1~/7MJ. APPENDIX 8-1 DRAINAGE COMPLAINT ANALYSIS (previously submitted) SOOS CREEK PLAT DRAINAGE COMPLAINT ANALYSIS LEVEL 1 TECHNICAL DESIGN AND INFORMATION REPORT FOR PRELIMINARY PLAT REVIEW For the King County ODES: SUBDIVISION FILE _A03P0286_ Richard A Boston Addendum to Report of January 26, 2004 Boston Design and Development Co LLC 425-226-2145: Neal M Jacques. P.E. Jacques Consuhing 206-242-5322 Soos Creek Plat TIR 1 By Jacques Consulting March 20, 2004 TIR Addendum DRAINAGE COMPLAINTS King County records were examined for downstream drainage complaints per core requirement #2. Note that at the discharge point this project contributes approximately 2% to the drainage basin flow thus requiring !4 mile investigation. But this report investigated southeasterly for one mile along the Soos Creek Basin(see attached map). The area was inspected and the County complaint listings fur a one mile radius were examined. The Soos Creek drainage basin in this area is relatively flat wide and heavily vegetated (grnss) with no erosion or flooding problems. The complaint list is attached but they all deal with issues which are uphill either west or east of the Soos Creek Basin. Only one was somewhat relevant, Complaint Number 96-1550, which is a class 1 issue (attached). This complaint in 1996, descn"bes the 18" culvert across 124th Ave SE at SE 192 as blocked and thus erosion over the 1241h gravel road. The solution, to unblock it, was done. The downstream flow ftom this project does not flow in this location but because the project access road goes over it, it was included. In February 2004 property owners were notified of King County's plan to widen SE 192 fur a left tum lane, thus this culvert will likely be modified. The subject project final engineering will have consideration fur the revised County intersection design. The remainder of the complaints had no relation at all with the project. The five page list and a map showning location of the most significant problems (eight ponding/flooding complaints) is attached fur general reference. These all involved tnl>utary flows from west or east down into drainage systems flowing eventually into Soos Creek Basin. None him: any relation to this projects drainage in the Creek itself. In conclusion, for the subject project drainage path, there is no indication of any category 1, 2, or 3 issues with drainage within one mile downstream. Note the TIR downstream analysis dated Jan 26, 2004 for additional discussion. 1 ' Soos Creek Plat TIR 2 By Jacques Consulting March 20, 2004 111 -..I ( tJ \II ... A z j ~;) nv =l V} J(}(!{Jg I f '>10 "'O jt~ i -= "' ... ~ ,= :il - / ' ,-...! t;;l ~I I u,o r-/8 1 ,u,;,[I .... ;:r; w tt I-V) ' 3S ?§ AV I- V> i!: I'- (D .... w V> r tn1 0:/ ?!=j ~1 ~m ........ ..... w <ll V, ~ I- V, a, ?!= a, .... >-C, "" "' rl UJ V, oooor .... "' "'t/ ;o; 000 z ~r r-l I HlBt J'd.AV ,=,;' "'t 1 YAV Hlltl I HJ.9vI Ul LI.It; Q.. ~ r ~J ""~ ~! r ]S k.ji~ V> ~o;.."> .snl~u 3S 0 .:t s"-ls ld ~ 0 r.,"\ filttl ~ >-i, 14411! Pl ldl "' ~ "' ~ st :.) I-..... 1s:1o %: ti) "' 3$. 3S ld IJNZl>t "' crutn n il I-C, C V) :z: .... N 0 o• "-;:] "' "' :i::: ~~ .... 3s ~--.r ... - rz t I I-g #-U') <D ~ ~ 002Q]_ KING cou~ sum=~ wAtt:K MANAl:it:111111:1'11 u1vR:J1V!'f DRAINAGE INVESTIGATION REPORT f'aQI 1; INVESJ1GATION1U!QUSST lype <?,. ReceW by: o.a: g /:;u. /1 t, OK'd by: D~ FPe'No. ~ -fJiffJ RBcaiv,d fnlm= ,ie.. prilll Plllnllr fllr wwww.lllg). 1Da11. ii;l,o) NAME: & ~ r haoic: PHONE A5¥-'l.197 ___ _ ADDRESS: /'i/'Z / "."' 12-e .At/G s.e: C1tY. $'eHrPY State ____ ZIP.91958 l.oc&llonafpioblllm.18 em: p,'.feJ; ,'s re .r· se: 192nd ~-/.;Wn,,A,IS,. R._ledPnl/lletn: //""f~ ~'ncPgt!-~~. /t/OR . . . .:. .. -.... . . . , ~ SF' Z..76f/3 C_..,1.e,YI ~,, c>iv 5 LotNo; 13 ICIIIII CounlY _,_....., .. , I unt --DRAINAGE INVESTIGATION. REPORT. FIELP IIMifllGA110N ----. ..,_ a1.11 llW IIIIN8CIIUIIRT RAMIi ADDmiaa l'BONll rs TR DQIIMGB ... KAJlfl'Z DffJSA»i _!_.. ,w ....... ---•= -•m•-•------A11wc111 1•-••---ww•l'CIU.•-•,--...,_,.~ ............. u,w1w011LTA ..... , ,., ......... 11111•arm1ffll:PIPIL --•11.11 AT• Jllal-Ol'Wfllllll all'C I --il-#a1,,,...ltrUNi A tl90POULWNi aF4WWWW1lffll SlC.Bl'CH: IIDIOIIOR er • _ _ ------- SI! 192NDsr ---- __ ... -- MESS.UH: TO JON! LED8E1JER, SUPERVISOR • PR.OM ...,,.., 1IM8ION 4 ·f!iNTIII ML ff9P ¥ ICllllt ~ ......... Marra F I -- lMRY~~ 8Ullft.1JCII WATIII NNM w, UICAL ~-'-AUi ~ 116 IINl'r,, lfA1L tn'OP Ga DATB 947-98 FOIi VDUR RW ONCE. DR."'"1'1E l'IPI! /ff 19'f21 -124TH AVI! e APPEARS TO Ille WfflllJI TII£ uc, ~ M llllCNllt ON 1'R .ACE E\dSDIIS IIAR PIPE .APPE.ARa TO R PI.Ua m.. PLEME 11&1'1..Y II' ROADS 1flU. CDIIR!Cf. IF NOT PD I 81 LE 1IDA. --- I· I SIGNBD UPLY DATE SIGNED r~~~':" _a' : ~,1···-;> ~i "'bEll '5 SE p ,... u.J ;;l: ~ 18 RD c1 L ,... V) f: j SE !11 !!l i:3 l TH ~ SE 1~'"' ST ~ J PL SE 85TH -· __ SE 86TH L ST I -' ,18 II • ... :::: u I> < > 188TH < -§> :r .-I< b 1; T"" .. J 1ST .... "' ;I ;1,~~ ~1;190,;:LN ~ '-:1110:, ~ .-1 • ::;1 ~ pl El92NO ST '.:'.; Q. -\_ I ~11 o .. -q,{,, ~ l:SSO . .... "' .., V, ,-< -·--· t96TH ~ 0 ( ~ -· ST -I ST ~~~~-----. ST ·--·-.·-E '\ ·~ ::;:i-t,.2 ~5TH sr j ""I ~\ ... -,.._ --1 :i, \ -:r.' .... SE '°' ,;. ""\ .... ' ' ..,_L,~-i.'.'..\.-i~ '~ ~ .... .... .... :a ~ SE 203RD l':11 ST 'tr rm 206TH sr sr. 2 nii 1; ,,. !:;,bi \' --\ ~, -,~ )8 ~ ~ T "' -~ TH s~L,.,! }srr2o~w ~L ST ,,'<::,~ . 3:~ SE 2091~ \ 111600 "'I~ "-N\~ g E t'4.; tt -r---'-c-ir---l /;/ :!' e't"' ... h ... "Tit S I (. ""-I ~ I C P-../'J.T 13 (.)T' r-.lC T R t7 L ~ V)'>,..N'i D\<,.._r,.t~~ C'...::.K f> L.,...irv-r-L..0 ~ON,S. ... , \.,~ SC? ... LE 12 ... ~, = I" ::.,i~ "'f ~v· S[~s,t; ~isml P!: :::i ~j <t' - SE ''!J(J"" "' ; s Jc9af'I, <} 1; ~t ll:l7TH ST SE 1ssr,,,. WY "-, ~,;E 190TH ST .,. ... i= n'~ a, ..,,OJ :::i c,'<-6~ lM.THPL ~ 1\7ra sE lsntt O L SE I ~ Pb~ . I I I I SE 1 SE l ; ~ 'J"' ~~ fAlt!t. 1 I 200TH I ST ··.--mrr---··t-·--i SE ~ ~ ~ :!;19 13200 14000 ., ZQ1STI ST 202NDI ST . a? i= ~ a:[.., ~J~_ ~ -hr- :::1 SE 204TH I PL,.;: ST <·, i= .... .... ...... IIIICllllllJWlllr'IIIIIIIB .......... ,, SIIUlt i: 111111111111 Plinlad; 3/tll/2G04~ PM C 77 I .... _.,,,.. ............. Ill II --.... Cl*· 1075-0141 C EROSION 12227 SE208TMST GALEN CARl)l t1 888F4. 1977-oooJ C ORNG 1ZI07 SE 111!NDST 0 GOLDEN HILLS 681A 1977-0072 C FLDG 11!2111! SE192NDST 686f2 1978-0080 C PONDING 19248 121STPL6£ l:AST OF eeNSOH ™"I' 6861'2 197&-0081 C OflNG 19248 121STPLSI: l86F2 1916-0085 C FtDG 20921 120THAVESE BACKYARD 6l6F4 1981..ooat C DANG 19917 122NDPL SE BlOCKEOIEAST HILL AREA 88BFS 1981.«!15 C DflNG 191118 122NDPLSE CIB CAVING 1H 686F3 1981-ll320 C FI.DG 20921 12Mtl AVE SE PANTNER I.I( AREA 886F4 1982-0539 C FUlG 1ai00 SE191!NDST E.ASr KENT AREA 6881'2 - 1SIIS-0424 X DANG 125211 SE2tl2NOPL SYSTEM MAJNTSWICE lll6F3 , ll84-00!)1 C OFING 2llllS6 121JlliAVE SE DITCH FILUNG 688F4 1984-Cl313 R FLOG 13250 SE1!11!N>ST TO ROADS DIVA 688F2 1984-0314 C FI.DG 13250 SE192NDST SE 192ND STf13<1TH AVE S5 688F2 1984-0324 C DANG SE 204lli ST.1124TH AVE 6ll8FS 1981M11FO C FLDG 18517 SE 200THST STOflM REI.AliO 688G4 198&0377 E DRl«3 ,2002 SE 208THST VLm Cfl7D PROB. BLOCKl:D Ol'IIVEWAY 81161'4 18880079 C FLOG 19807 13BlHPL Se EROSION 6"1163 198&,0632 C QANQ 13250 SE 112NDST DAAINPIPE 88803 11181J.0832 eR DANG 132&0 SE 111111ND ST PROB CATD 'BY Pf\MT RVW 8ll6G3 188&0702 C DANG 122-40 SE 20011iST MAllfTENN,ICI: OF LOT 688Fa 18116-1180 C FlDG 1&413 SE aJOTHST LAND IN Fl.000 PLAIN 111.0CKl:P PIPE 6$IG4 1986-11112 C DANG 13'103 6E 200TMST SEE ll&-1146,0S00,0491,049t,0317 fl88G4 1B86-11B2 ER DANG 137113 SE 20CJTHST (DS Pt.T) PROB COR. 688G4 1987-(1246 C FLDG 20236 127TMPL SE WATl:R l'flOM NEIGHBORS 87-oa18 6881'\9 1987-0000 C DRNG 137U1 SE l!01STST DOWNSPOUTS NOT CONNECTED lO ORN 88684 1887-0000 eR VIOLATE 13701 SE 201STST SEE e&,11112.1146 87-1)4111,0317,0492 68SG4 111117-CX,17 C•. A..08 1aroe SE 2.0'ISTST DOWNSPOUTS NOT CONNECTED 87-moo 686G4 11187'°491 C FLDG 13700 SE 1!112NDCT tlOWNSl'OUTS 86-1146, 11B2 87-llS00,317, 88BG4 1987-o491 NOA (DS-Pl.1) SWMDIDIOlllf'ROB ~ 1987-0492 C FUlG 13702 SE 202M)ct DOWNSPOUlS 8&-1148, 1182 87-o.100,317, e80G4 1987.o&75 C orra-1 19407 124Tt!AVE SE DfWNAGE om::H ON PflOPERTY 8ll6F3 1987"'1842 C DANG 19400 184THAVE SE 1:ASEMEN1' ENCLOSING DITCH B86G3 . 1987-o91B C DANG l!023II 1270f Pl. SE WATI:R UNDER HOUSE 87..Ql!.44i G86F4 © 1987.fl998 C DANG 12810 SE loeNDPL 11.U!GAL FILI-IN SOOS CI\EEK 68663 1118'7-1049 C TO AD COORD~ffST. B86F2 19880Q22 C DRNG 20260 132NDAVE SE WATEA FROM NEW oevEI.OPEMENT 88tlG4 P11g4> 1ol5 Ci al II tvll Tnllll'l'IIIIIIII ... .,._. I: 1111'11'811 ...... ... 1988-<l"llll C FLOG 18431 120'TttAVE SE NEW DANEWAY WILL rr FLOOD 8IIIIF2 19!'&0238 ER Pll'E 18431 1ZUT'KAVE SI! NEED l:Xll:NSION OF 4.2" ~\IEFIT 68flf2 19BB 0239 C DRNG 137$1 se 2111!NDPL WATER l'ROM CL!ANED UP CREE< 686G4 1~c DANG 19816 13:!ADAVE SE UNFENC!I) RIO PONDIINFO r:;<TO SWM-F ~ 198&0538 C DRNG 19412 1311THPL SE NEAR SOOS CAEEl(IF8.L /11"1 a EffllNG ll86G3 1988-0li61 C DflNG 20002 1ll4THAVE SI FLL IN W£rl,NIDS &aeF3 198&-0II08 C DANG 19622 133RDAVE ctN.~CONSTl'IUCTlON 6ll8G3 1988o(l808 E DANG 19111!2 t31RDAVE NEWDIWNAGE SVSEM -1 IIIIII-Cl003 C DANG 111&12 12DTHAVF. SE ,INCREASED RUNOfFICl1ANNEL 68fif2 19IIIHI019 C DANG 19400 1241'HAVE SE DllCli MAINTENANCE tlll6RJ 1989-oo49 C DANG 20260 182NDAV& SE (M) FOfeiT GU:N)SOOS Fl..000 rv.tN 688G4 1989-01!12 C DANG 18812 t21Jlff A\IE SE X PIPE NOTWORKING 688F2 1989 0828 C DA'IG 12l!OI! SE 204THST BIJIUJf:R OF NEW HOME IMPCJff1'cD Fill. 888F4 1989-0410 C DANG 12213 SE 199THST PONDINGINORAINAGE~© 191180523 C DANG 14439 143FIDPL SE CONST ON NEW HOMEIW£T YARD 688G8 1989-0554 C DANG 1211115 61! 20ffll ST EflOSIOt.l OF YARDS IN NEW Pl.AT 68liF4 1989-0560 C DANG 2IXiOB 123ROPL SE DOWNSPOUTS ERODING YAAD 89,0564 68IIF4 19811 QS&t C Efl05ION 20!lll8 129ADPL SE NEW HONE DOWNSPOUTS OflEIII BBGF4 1991H!ft1 C l)FWfG 1S719 SE' 1WJHPL DRAIN PIPE fUUJSTORM · 688~ 1Sll0-0430 C FUJG 13755 SE 2llC!t«> PL CAeEI< FLOQDED HOUSE/STOf\M EV£NT--.SS . 1891H>494 C DANG 19422 SE 2001lfST STORM 68llG3 1990-0494 Nl>A DRAINAGE 1342 SE' 20l1TttST NAlURAL DURIS TRASH F\foCI< INDA REV 68l5G3 199CHl864 ER MIINt«ll.E 12400 SE 201ST' PL FAIUJRe-UNDA CREST PLAT DIV 1 & 2 68IIFS 198CMIB11 C Q'S 13719 SE t8'THPL IN YARD, OVERFl.O. 800484.221 -li86G$ 19111H1910 C FLD8 12403 SE 202N0Pl WA'TSI FROM NEW OEVELOPeMetff' 686F4 1991>-1001 C RJ>G 19412 131mf PL SE BACKYARD 6"' DANG PIPE 6l8G3 19II0-1063 C DflNG 12025 SE' 195THST SPRING HIU. ONl:A)ITCH NOT DRAINING 681lfS 1990-1130 C WTRQTI.Y 1S600 133ADAVE SE IIANk SFABll.JlATIONll90S PLAYIHEI NEA 68883 1990-1286 C DANG 111832 134THC? SE CLEARING OFLOTIDITCH MAINT 886Gll 1990-14!!6 C ER06ION 12fii01 se 201STPI. UNDACREST 8ll6F4 1990-1577 SE SnJDY 12&01 SE l!OtST Pl.ACE' $!'UDY OF AREA 886F4 11111(1-1598 c'· FlDG 12408 SE 2ll2f«> PL WATER ON I\OAOl'(ARJ)IUNOA CREST ST eeeF4 1990-1612 X DFING .12601 SE 201STST O IJNDACAEST DIV II 11881'4 1119Hl17B C FUIM:RO 12801 SE 196THST--t'OOUNGOFWATI:fl rJIIIJSs@ 11191-0176 ER FLDGIERO 12801 SE 1111ffil ST FWGGS> PIWATE PIPE G8IIGS 1991-()178 SFI FLDGIEJIO 12801 SE UllffliST HOMEOWeR LOT ll8IIG3 ,I 189HJ299 C FUlG 198S5 121STAVE SE Oll8lFLOW OFF PIPES li1161'3 1991-al!flll SR FU>G 19835 121ST 14VE SE REFER lO BALD 886F3 1991-(1412 C DANG 11151iD 13SR>AVE SE EROSION OF ACl:SS ROAD 88&G3 199H>428 C FLOG. 12100 se 197THST WASHOUT OF AOAD.'DEVEI.OPE B86F3 Paga2.ol 5 • 1 7$ t ........... ..... ., ... In .. ..... -199'1-1>446 C FLDG 196811 140'1'H AVE SE INFO TO RDSIWAla\lEROSION IN YARD 68883 1991.(1512 C FLOG 2!0024 t241l!AVE SE CATCtt BASIN LEAl<$'OIIEMOWS &86F4 1991-()518 C FUIG 13400 SE 2001liST ll86G4 1991.()518 NOA FI.DG 13480 SE201m1ST TOCIP 688G4 1119'1.0St& PN FLOG 13431 SE 2001HST TOCIP tl88G4 1991..Q679 C WTRSNI 20313 122NOAV£ SE WA'm\ OVEfl SIOEWAI.J( l86F4 1ll9HlS79 E WfflSNI 813 UINOAVESE OH1SWM DIV PLY S86f'4 1991-0579 EH W'lllSNI 2091S 1ZN>AVE SE Ol1ISMI DIV PLY 686f'4 1991.()680 C NlG l!lll03 124THAVli SE SMAU. DRAIN SYSTEM CUlGGED 888f'4 1891..o?ll8 St FUlG 12408 SE l!lll!NDPL 6811F4 1991-tOGS C OOAINAGE 12218 51; 191JTHST PONDNGIN YAAOIFENCltlG J =@ 1119t-1058 C DflAINAGE 18714 SE 20MHST, -WATSI IN CRAWL SPACE 1911'1-11158 SR DAAINAG£ 13714 SE l!IIIITHST NOTNDAP 88IIG4 - 19ll2--0IIOO 0 EROSION 19513 1SSRDAVI£ SE HOMEOWNERS' POND O.F. fi8BG.1 1992-02QO NO.A EAOSION 12801 se. 198THST HOIAl!OWHBIS' PONDOJO. &8IIGa 19!J2.0200 SR l:ROSION 1951$ 133ADAYe SE HOMEOWNERS' POND o.F, 6111183 1~ S3 sruov CULIIEFIT UPGRADE li88F4 1991M1310 C DANG' 18832 t34Tt!PL SE WETLAND GRADING-DflAINN IN CRAW ll86G3 1988,0310 NOA DRNG 19832 t3"THPL SE WETI.AND~INCRAW 6111163 1999,0$10 RN DRNG 111832 13'THPL SE Wl:TLANO GRADING-DflMNAGE IN CRAW 68883 t IIIIG-0383 AN FLOG 211247 117THA\IE SE UPS1lleAM DEVe.OPMEKr 6llliF4 1993,0412 C llflNG 18600 1Kl'H PI.ACe / SE WETLAND CAUSING DIVERSION 6IIBG3 1993-0412 NDA DANG 19&00 134THPLACE SE WETLAND CAUSING DIVERSION 8ll8G3 199S-0412 AN. DANG 18600 1~PLACE SE WEn.ANO CAIISING DIVERSION ~ 19DOS77 C DANG 1374!1 SE ICl2NOPL PONDING IN YAAD ) 199&0577 NOA DflNG 1S74S SE 202NDPL NEW PtAT WIU. ADDRESS 1911N517 FIN DANG 13746 SE ll02IIID PL P<lNOING '"' v~. NtlAP-C 198&068D E EROSION 12IIOO SE l!ll'ISl"PL -1993-0580 ER l:ROSION ,aoo SE 20'ISTPI.. 6B8G3 111113-0691 C FLOG 20402 1321C)AVE SE l:ROSION FROMlME Pl.AT OF GRAVSTON 111884 1911lM15&1 Rt;I FLDG 20402 1SIH>AW SE EROSION FROM THE Pl.AT OF GREYSTtlN eaeG4 1993,,0582 C DRNG 122118 SE l!081ff ST SURCIWIG£ FROM CIB 6e8F4 19!IG-0794 VIIQA DUMPING · 12561 SE 20IRD PLACE TOWOA 88IIF4 1898-0794 woe lltM>IHG 11561 SE 2ll8flO PLACE TOWQA 81'4 1994 0088 C DAJtG 1INl30 131JTMPL SE ACT1VE GRADING VIQLAl'lON l.93GVll96 '8liG3 199+0118 C DANG 2114411 131STPL SE BROKEN MAIU!OX POST 681184 19114-0321 C INQUIRY 12521 SE l!OSlD Pl.AC£ /W't PIPES IN YARD WHB'IE SHE WILL OI 681:1F4 1994-0431 C POt'OING 128Cl2 SE l!Ol!NDPL PONDING IN GUTTER 611BF4 11194 D612& WQC 01lrtNCB 1Q8&2 133RDPL SE 68883 1994 0826 WQE OIUINCII 11l8!12 133RD Pl. SE 68683 t ti I l = 11 .......... ......... IN,_ ..... 199+0783 C Flll.lN8 20411 t32NOAVE SE FILL PLACEO wmoN SEWER EASEMENT B86G4 1991(17113 NOA RU.ING l!D411 132Nl>AYE SE FIU. PLACED WITiftN SEWEA EASEMENT 6ll6G4 11196 0048 C DANG 20255 12ffliAVE SE WORK IN WE'nNl)S CONTAC'f AINSLE 686F,t 1~c DANG 208m 124'THAVE SE GROUND WATER ll PVT DRAIN 6116F4_ 199!MISB7 l( OfltlG ~ 124THAVE SE WEnNI> ON HIS PROP£fllY 6B8F4 198$o724 C CI..E.AHOUT 2111134 181STPI.. SE DAI\IN ~CONST IMPACT 88884 1!111G •mo C R/OPOND tDI& SE 1!Nllll ST fWGGED CULVERT 1W OISCHAAGE PIP &8683 198$,00B1 C M>POND 20255 124nfAVE SE DOWMSTfEAM IMPACT FROM RID OUTI.J! 111161"4 111118-Q245 C RUNOFF 19$21S 1!2NDPL SE SPAIN$ HILL l!UMENTMY INFO ROS DI 8l&RI 19911-0788 C FI.DG 1Zl3l se 2II01HST FLOODING OUE TO STOAl,I ANO SUBSTN E:)C?J 199&0788 """ FLDG 122SI? SE an-,sr FLOODING DUE TO STORM AHO SUBSTN 199&07BI R FLOG 122!12 SE 2001HST Ft0001NG DUE TO STORM ANO SUBSTN · .,18R§:]@ C DANG 18121 1Zfflt6'& SE PLUGGED !WI CULVl:RT IMPACT fO PV1' llll&A(-B ., • 1998-1435 C MNG 200Z4 124THAVE SE ROAD IMPAOVEMENT PRO.Etrr IMPACT 688Fa 18$$-111s woe llUMPfNG 13308 SE 1lll!Tli ST WRECKED YEH IN RO FACILITY D81444 lll6G3 1119(1.1906 E WDPOND 12118 SE 2SINI> Pl. FBICI: ENCflOAOIMENP INTOlllACT eaiA 1987-osat C DAAINAGE 130l!G SE ZOlllllPL PLUG<'.fD PRIVATEYAIIO DRAIN TA PRO 611884 1997-0ll38 FCfl FAC.OOM 1S3RD AVE SEO SE 195-19lnll KIDS ACCESS OVERFLOW PIPE NEED TR 68883 19117-0783 FCR FIOFONO 191125 132RDPL SE WINDl'ALLS ADJ TO POND PARKS INVOL G8IIG.1 19117-1179 C DRAINAGE 19113 121STPL SE INSl"AUATIONOFDRNGINAIW 01.D/OFf 6e8F2 1997-1179 NDA ORAINN3E 19118 121STPL SE INSfAUATION OF DANG 1N R/W OLD(OfF 68SF2 1997•1179 R DRAINAGE 19113 121STPL SE INSTALLATION OF DflNG 1M R/W _ OLOOfF 8IIIIF2 1997-1301 C DRAINAGE 19125 121STPl se SUBSTANDAAO INS1l. OF DflNB SYS PVT 6881'2 19117-1505 C TAeES 122112. SE l!IJOTHST DN«iEROUS lRE£!3 ON COUNTY l!ROP 688f8 19117-1530 FCA AID 19500 133AOAVF. SE DEBRIS & ~ llLOQ(ING TRASti RAC U6G3 1997-1512 C TREE 121132 SE lGOll-1 ST REMOVAL OF WINDFAU.S FIEQUIFIED 6861'3 199«Hl108 woe OILSPLL SE 199ST/124AVE SE SPtU. OF POU.UTANTS Al.ONG RD 'NH 8ll&f8 11188 0223 FCR FENCE 211111• 127TMPL SE DAM~ED F£NCe ADJACENT TO FENCi: ll8&F4 189&-0381 C DIWNAG£ 12483 SE t911THPL INFO REQUflST RE Wl:TLAND,()PEN SPA IJll8Fll 1998-0887 FCR DflAINAaE 13.1AD SE 0 SE 1115-196111 PWG8ED TRASH RACKS J'()NDING UP$T 68IGll 19!18 0922 FCR RDPLUGD SE 208tH ST11271H AVE PLUGGED OAIFICE" & FENCE REPAIR 6ll8f'4 19Q8 09211 C 1 • DRAINAGE 19133 121STPL SE APPMENTOSSTRUCTION IN AOAD ORN 8ll&f2 191180503 C FENCE .1245& SE 198THPL REQUEST FOfl F!:NCE 80UARDS Af /IC.C ea&F3 1911M915 FGR PLU8GED 19500 133ADAVE SE PLUOOB> ll'IASH RACKS De!IRIS FIEMOV eeaG3 2flDOoOOll8 C DDM 121125 SE 1a!NDSI" REQUEST TO DN£RT FLOW OISCHARGIN 68IIPl 2Cl«lCl-«M15 C MNM 1221)8 SE 2117THPL VEGETATION GflOWTH IN TRACT. TRACT M"4 200CMl5D1 fCR MUG, 19915 1331'1DAVE SE DW...'>eE TO AID POND FJIO Nl!IGI IBOAH 88683 2006-0713 C DDM 122112 SE 2IXITH ST INCflEASE PI..OWWS IMPACTING DRAINA 8116F3'\ _ 21lOQ-11713 ND!\-DOM 12232 SE 2llQlH ST INCREASE FLOWS IMPACTING DIWNAGE ::;; ® 2000-0713 A PDM 12232 SE 200TH ST INCflEA.SE FLOWS tMPACl'lNG DRAINAGE . ta;J[I 11111 , ... , .... ... .,Pnllllll C Eh --..... -l!Q01-4!11.14 C DOM 20813 1l!!llllf AVE se IJTILllY WORK DAMAGED STUB OUR DflA ll86F4 l!CI01.o416 wee woa 12232 se: 200THST CONCERN OF SOAP SUOS BEING DISCHA 886FS 2001-IM!i6 WQC WQB 1l!S13 SE '191JJ»ST Af'PNetr ~ OF POW1TANT CONTR 1586FS 2ll01-04SS 'NOA WQII 12313 SE 198THST APPAAENI" I.\CK OF POU.UToUl'T OONTR 8ll&P.J. 2111)1-0471 FCft MNM 2lllt95 1Si'1MA'I/E SE VEGE't'ATION GAOW1'H IEAVIEfl'THAN II 888G4 2DO'l.o&32 FCC WQO 12430 ~ l!llffll ST APPAAEHT DUMPING OF PAINI' 00?? lNf 886F4 21JD1.Q632 WQFI WQI) 12430 SE 20BTHST APPARENT DUMPING Of PAINTOR?? INT 686F4 2IIOH02II C OTA 18618 SE liOO'TllST INFORMATION FIEQUEST R£GAADING PO 88&G3 :llllJe.Q268 FCR BSR 203l58 131STPLSE ~AI.Ef!El'RORI" li86G4 2CJOi.OR6II AeT BSR 20368 131STPLSE 81().SWALE AETRO-AT llll6G4 ~c MM,\ 121135 SE 199THS'T REQUl:StTO F&IOVETIIEES ON COUNr eaaF3 2(l02,0Bl)3 DOM I.AKEY EOF132ND APPARENTIIEA\IEA ACrlYrrY IN SOOS C 6ll8G4 200&0803 C DDM LAKEY EOF132ND APPARENT SEA'IER ACTMTY IN SOOS C 886G4 l!OOf~ NDA-DDM LAl<EY EOF182NO APPARENT BEAVER N:TMrY IN SOOS C 68BG4 ~A DOM LAKEY EOF132ND APPAAen' BEAYefl >CrMrY IN SOOS C 6ll6G4 20IXMl546 WQR WQB 1BflO'I 121miPI.SE flllllF2 200$-0782 WQA WQAI 19433 VASHON HWY SW BMPS a,e ALL IN PLACE 6881'2 2DOS-C809 WQC WQDfl 18601 126Tff Pl.SE AUTO FUJII) AeSIOUE ON STIIEET AS AR G88F2 20Q4.0111G FCR MNM 12815 SE 2111ffliPL MiNll'19111Ck onga1a. ~ s1,uwsgac 11861'4 APPENDIX C ANALYSIS AND DESIGN . . \ \ ~~=~~~..-----,. L~ \ \'" \ I \ I I EXISTING SITE: N ffi . "' \ ' \:,. I \ I \ . ~·3 -' 1, , \ ... \ 1,. ~'"\l .. . •,\ . \ ·~ ~,,,I ;\ ~,, . ,~· \ \ r\ \ \\", \ \ -. PROPOSED SllE: SITE SF (AC): '" 0 I \ FOREST: \ I \ 75 I 150 : BUILDING: SI TE SF (AC): 251,117 (5. 77) 4,535 ( 0.10) 16,570 (0.38) 4,592x47x0.7 = 151,077 (3.47) 55,005 (1.26) SCALE: l'' = 150 ft. PAVEMENT: POND: LANDSCAPE: TOTAL: 47,121 (1.08) 319,343 (7.33) 8,000 (0.18) 105,261 {2.42) 319,343 (7.33) ROOF AND D /WS: (70% OF LOT AREA OR 4,000 SF -'IIJ-IICHEVER IS LESS) pond.exc Fleuve des voiles & cogger Plats Runoff Cales Input 5/13/05 · KCRTS Program ... File Directory: C:\KC_SWDM\KC_DATA\ [CJ CREATE a new Time series ST 5. 77 0.00 1.08 0.00 0.00 0.00 0.00 0.48 exist.tsf T 1.00000 T 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 [CJ CREATE a new Time series ST 0.00 0.00 2.42 0.00 0.00 0.00 0.00 4.91 dev.tsf T 1.00000 T 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000000 Till Forest 0.000000 Till Pasture 0.000000 Till Grass 0.000000 outwash Forest 0.000000 Outwash Pasture 0.000000 outwash Grass 0.000000 wetland 0.000000 Impervious 0.000000 Till Forest 0.000000 Till Pasture 0.000000 Till Grass 0.000000 outwash Forest 0.000000 Outwash Pasture 0.000000 outwash Grass 0.000000 wetland 0.000000 Impervious [TJ Enter the Analysis TOOLS Module [P] compute PEAKS and Flow Frequencies exist .-tsf exist.pks [P] compute PEAKS and Flow Frequencies aev.tsf dev.pks [R] RETURN to Previous Menu [x] exit KCRTS Program Page 1 Fleuve des voiles & cogger Plats Runoff Cales 5/13/05 Flow Frequency Analysis Time series File:exist.tsf Project Location:sea-Tac ---Annual Flow Rate (CFS) 0.531 0.246 0.502 0.140 0.288 0.479 0.434 0.868 Peak Flow Rates--- Rank Time of Peak 2 7 3 8 6 4 5 1 2/09/01 15:00 1/05/02 16:00 2/28/03 3:00 8/26/04 2 :00 1/05/05 8:00 1/18/06 16:00 11/24/06 4: 00 1/09/08 6:00 computed Peaks Flow Frequency Analysis Time Series File:dev.tsf Project Location:sea-Tac ---Annual Flow Rate (CFS) 1.41 1.16 1. 69 1. 27 1. 52 1. 50 1.84 2.83 Peak Flow Rates--- Rank Time of Peak 6 8 3 7 4 5 2 1 2/09/01 2:00 1/05/02 16:00 2/27/03 7:00 8/26/04 2: 00 10/28/04 16: 00 1/18/06 16:00 10/26/06 0:00 1/09/08 6:00 computed Peaks Flow Frequency Analysis Time series File:devlS.tsf Project Location:sea-Tac --~Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 2.34 6 8/27/01 18 00 1.64 8 1/05/02 15 00 4.96 2 12/08/02 17 15 1.88 7 8/23/04 14 30 2.76 5 11/17/04 5 00 2. 77 4 10/27/05 10 45 3 .25 3 10/25/06 22 45 7.01 1 1/09/08 6 30 computed Peaks Hr uf:ri : l,t 4) : ·f sumpks.txt -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 0.868 1 100.00 0.531 2 25.00 0.502 3 10.00 0.479 4 5.00 0.434 5 3.00 0.288 6 2.00 0.246 7 1. 30 0.140 8 1.10 0. 756 50.00 0.990 0.960 0.900 0.800 0.667 0. 500 0.231 0.091 0.980 -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 2.83 1 100.00 1.84 2 25.00 1.69 3 10.00 1.52 4 5.00 1.50 5 3.00 1.41 6 2 .00 1.27 7 1.30 1.16 8 1.10 2. 50 50.00 0.990 0.960 0.900 0.800 0.667 0.500 0.231 0.091 0.980 -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 7.01 1 100.00 0.990 4.96 2 25.00 0.960 3.25 3 10.00 0.900 2. 77 4 5.00 0.800 2.76 5 3.00 0.667 2.34 6 2.00 0.500 1.88 7 1.30 0.231 1.64 8 1.10 0.091 6.33 50.00 0.980 Page 1 Fleuve des Voiles & Cogger Plats Retention/Detention Facility 5/13/05 Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Effective Storage Depth: Stage O Elevation: Storage Volume: Infiltration Pond 2.00 H:lV 131. 20 ft 43, 73 ft 5138. sq. ft 9637. sq. ft 0.221 acres 4.00 ft o.aa ft 28892. cu. ft 0. 663 ac-ft Vertical Permeability: 60.00 min/in Permeable Surfaces: Bottom & Sides Riser Head: 4. 00 ft Riser Diameter: 12.00 inches Number of orifices: 2 Orifice # 1 2 Height (ft) 0.00 2.30 Diameter (in) 2.65 1. 86 Top Notch Weir: None Outflow Rating Curve: None Full Head Discharge (CFS) 0.380 0.122 Pipe Diameter (in) 4. 0 Stage Elevation Storage Discharge Percolation (ft) (ft) (CU. ft) (ac-ft) (cfs) {cfs) 0.00 0,00 0. 0.000 0.000 0 .00 0.03 0.03 17 3. 0, 004 0.032 0 .13 0 .06 0.06 346. 0.008 0.045 0 .13 0.08 0.08 461. 0.011 0.055 0 .13 0.11 0, 11 635. 0.015 0.063 0.13 0.14 0.14 810. 0 .019 0.071 0 .14 0, 17 0 .17 986. 0 .023 0.077 0, 14 0.19 0.19 1103. 0.025 0.083 0, 14 0.22 0.22 1279. 0.029 0.089 0 .14 0.25 0.25 1457. 0.033 0.095 0 .14 0.35 0.35 2051. o. 047 0 .112 0, 14 0 .45 0 .45 2654. 0.061 0.127 0.14 0.55 0.55 3263. 0. 075 0.141 0 .14 0.65 0.65 3879. 0.089 0.153 0 .14 0. 75 0.75 4503. 0, 103 0.164 0 .15 0.85 0.85 5134. 0 .118 0 .175 0 .15 0. 95 0. 95 5772. 0.132 0.185 0.15 1. 05 1. 05 6417. o .147 0.195 0.15 1.15 1.15 7070. 0.162 0.204 0.15 1.25 1. 25 1730. 0 .177 0.212 0 .15 1. 35 1. 35 8397. 0. 193 0.221 0.16 1. 45 1. 45 9072, 0.208 0.229 0.16 1. 55 1. 55 9755. 0.224 0.236 0.16 1. 65 1. 65 10444. 0.240 0.244 0.16 1. 75 1. 75 11142. 0.256 0.251 0 .16 1.85 1. 85 11847. 0.272 0.258 0.16 1. 95 I. 95 12559. 0.288 0.265 0 .17 2 .05 2.05 13279. 0.305 0.272 0 .17 2.15 2.15 14001. 0.322 0 .278 0. 1 7 2.25 2.25 14743. 0.338 0.285 0.17 2, 30 2.30 15113. 0.347 0.288 0.17 2. 32 2, 32 15262. 0.350 0.290 0 .17 2. 34 2.34 15411. 0.354 0.293 0 .17 2.36 2.36 15561. 0.357 0. 298 0 .17 2, 38 2.38 15710. 0.361 0, 304 0 .17 2.40 2.40 15861. 0, 364 0.312 0 .17 2. 42 2. 42 16011. 0.368 0.320 0.17 2.44 2.44 16162. 0.371 0.330 0 .11 2.45 2.45 16237. 0.313 0.335 0 .17 2.55 2.55 16996. 0 .390 0.351 0. 18 Surf Area (sq. ft) 5138. 5159. 5780. 5794. 5815. 5836. 5858. 5872. 5893. 5914. 5985. 6056. 6128. 6200. 6212. 6344. 6411. 6491. 6564. 6638. 6112. 6786. 6861. 6936. 7012. 7081. 7163. 7240. 1317. 7394. 7432. 7448. 74 63. 7479. 7494. 7510. 7525. 7541. 7549. 1627. Hyd 1 2 3 4 5 6 7 8 2.65 2.75 2. 85 2.95 3 .05 3 .15 3 .25 3.35 3.45 3.55 3. 65 3.75 3.85 3. 95 4.00 4 .10 4.20 4.30 4. 40 4.50 4. 60 4.70 4.80 4.90 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 2. 65 2.75 2.85 2. 95 3.05 3 .15 3.25 3.35 3. 45 3.55 3.65 3.75 3.85 3. 95 4.00 4 .10 4.20 4.30 4. 40 4.50 4. 60 4.70 4. 80 4. 90 5. 00 5, 10 5.20 5.30 5 .40 5.50 5.60 5.70 5.80 5.90 6.00 Inflow Outflow 17762. 18537. 19319. 20109. 20907. 21713. 22528. 23350. 24180. 25018. 25865. 26719. 27582. 28453. 28892. 29775. 30667. 31567. 32476. 33393. 34318. 35252. 36194. 37145. 38104. 39012. 40049, 41034. 42028. 43031. 44042. 45062. 46092, 47129. 48176. Target Cale Peak stage 2.83 ******* 2.17 1.42 ******* 0.54 4. 31 4.01 1.41 a.so 1.50 ******* 1.69 ***;,-*** 0.89 0.29 1.16 ******2 1.27 ******* 0.50 4.00 0.50 3.96 0.41 3.06 0.29 2.26 0.23 1.46 0.22 1.37 Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdout 0.408 0.426 0.444 0. 462 0.480 0, 498 0. 517 0 .536 0.555 0.574 0.594 0. 613 0.633 0, 653 0.663 0.684 0.704 0. 725 0.746 o. 767 0.788 0.809 0.831 0.853 0.875 0.897 0.919 0.942 0.965 0.988 1. 011 1. 034 1. 058 1. 082 1.106 Elev 4.31 4.01 4.00 3.96 3.06 2 .26 1. 46 1. 37 0, 365 0.379 0.391 0.402 0.413 0.424 0.434 0.444 0. 454 0.463 0.472 0.481 0.490 0.498 0.502 0.818 1. 390 2.130 2.930 3.220 3.480 3.720 3. 950 4.160 4.360 4.550 4.740 4.910 5. 080 5.250 5.400 5.560 5. 710 5.850 5.990 Storage 0.18 0 .18 0.18 0.18 0.19 0.19 0.19 0.19 0.19 0 .19 0.20 0 .20 0 .20 0.20 0.20 0.21 0.21 0.21 0.21 0.21 0.22 0.22 0.22 0.22 0.22 0.23 0.23 0.23 0.23 0.23 0.24 0.24 0.24 0.24 0.24 {Cu-Ft) (Ac-Ft) 31616. 0.726 28986. 28885. 28537. 21014. 14784. 9153. 8507. 0.665 0.663 0.655 0, 482 0 .339 0.210 a .195 Inflow/Outflow Analysis Peak Inflow Discharge: Peak Outflow Discharge: Peak Reservoir Stage: 2.83 CFS at 6:00 on Jan 9 in Year 8 2.17 CFS at 9:00 on Jan 9 in Year 8 4.31 Ft Peak Reservoir Elev: 4. 31 Ft Peak Reservoir Storage: 31616. Cu-Ft 0. 726 Ac-Ft Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank (CFS) 0. 502 3 0.230 7 0.414 5 0. 222 8 Time of Peak 2/09/01 19,00 1/05/02 18,00 2/27/03 10:00 8/23/04 23,00 -----Flow Frequency Analysis------- --Peaks --Rank Return Prob {CFS) ( ft) Period 2.17 4.31 1 100.00 0.990 0.536 4.01 2 25.00 0.960 0.502 4.00 3 10.00 0.900 0.499 3.96 4 5.00 0.800 7705. 7783, 7862. 7942. 8021. 8101. 8181. 8262. 8343. 8424. 8505. 8587. 8669. 8752. 8793. 8876. 8959. 9043. 9127, 9211. 9296. 9380. 9466. 9551. 9637. 9723. 9809. 9896. 9983. 10071. 10158. 10247. 10335. 10424. 10513. 0.285 6 1/05/05 10:00 0.414 ·3. 06 5 3.00 0.667 0.499 4 1/18/06 22:00 0.285 2.26 6 2. 00 0.500 0.536 2 11/24/06 6:00 0.230 1.46 7 1. 30 0 .231 2 .17 1 1/09/08 9:00 0.222 1.36 8 1.10 0. 091 computed Peaks 1. 63 4.23 50.00 0.980 ...... f) .L ~ __, Cl) e> Ctl C (.) Cl) :) 1 10 ~o '+ ---j _J "' J 10° "' rdout.pks in Sea-Tac exist.pks • • (> Return Period 5 10 I ! (> • R ··-• • t •oo ___ _ 10-1~-·~-~--~--~ -~-~-~-~-~-~--~-~--~·---i 1 2 5 10 20 30 40 50 60 70 80 90 95 98 99 Cumulative Probability Treatment Pond Sizing Routine Project: Fleuve des Voiles & Cogger Plats Treatment Pond Date: 5/13/2005 Blue represents manual entry fields Red represents calculated fields Step 1: Wetpool volume factor (f} ... either 3 or 4.5 f= 3 Step 2: Mean annual rainfall (R) ... from Fig. 6.4.1.A, pg 6-69 R= 0.47 in Step 3: Runoff (Vr) ... Vr=(0.9Ai+0.25Atg+0.1 OAtf+0.01 Ao )xR/12 Ai= 214,082 sf Atg = 105,261 sf Alf= 0 sf Ao= 0 sf Vr= 8,577 cf Step 4: Wetpool volume (Vb) ... Vb=fVr Vb= 25,731 cf Step 5: Wetpool dimensions ... Vb=h(A1+A2)/2 Solve by trial & error A1 = 5,450 sf L= 43 ft 3L = 128 ft h= 8 ft S= 2 ft A2= 1,018 sf *Vb= 25,873 cf •it Vb calculated in Step 5 < Vb from Step 4, then increase h Cell 1 must contain 25% • 35% of total wetpool volume Cell 1 required volume between 6,433 and Cell 1 A1 = h= S= A2= V= (43x44) 2,000 sf 8 ft 2 ft 162 sf 8,647 cf Drainage Cales FV.:ds (Treatment Pond ) 5/1312005 Cell 2 A1 = h= S= A2= V= 9,006 cf (43x84) 3,600 sf 8 ft 2 ft 784 sf 17,536 cf ·vb= 26,183 cf I, I I 25 .,. ~,,, .. , "\1":i 'd "' - \ \ r;.-;,'\ ' ~ " .... - I ..l ,20 \ ~\ ;\ \ ... ~;, \ \ \ X \ ' . 1: .;;a': \ ~~, . . ·• u :.: MJ •&\ \ AA• . "' ' \ \ ' \ \ \ \ ' \ "' " 'i \ 1~ ' \ ~ ~ \, 1' . ., \ 'i ~ \ \ ' ~ \ \ \ :, SP'J \ \ " \ ., \ ' , ..• ,~ . s.~ 192ND' -S~T.;;·.•c.;;,-..;,~, , .. _-.:;-, '-'.-<'--',-',-. -;-•, ~~--'-~~~~,--'--~~---':-:~- .. :,.,c,·--·-··•"•--.-.'.,., ..... ~ .. • ~-::·t·.'2-i' ~' ' ·-.. ''·"' -" FOREST: PAVEMENT: EXISTING 1241H: SITE SF (AC): 4,000 (0.09) 7,064 (0.16) LANDSCAPE: 3,801 (0.09) TOTAL: 14,865 (0.34) N EB PROPOSED 1241H: SITE SF (AC): 14,422 (0.33) 433 (0.01) 14,865 (0.34) 0 I 75 I SCALE: 1" 150 : 150 ft. 124th Avenue SE Runoff Cales Input 5/13/05 vault.exc KCRTS Program ... File Directory: C:\Kc._SWDM\KC_DATA\ [CJ CREATE a new Time series ST 0.09 0.00 0.09 0.00 0.00 0.00 0.00 0.16 exist. tsf T 1.00000 T 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 [C] CREATE a new Time series ST 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.33 dev.tsf T 1.00000 T 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.000000 Till Forest 0.000000 Till Pasture 0.000000 Till Grass 0.000000 outwash "Forest 0.000000 outwash Pasture 0.000000 Outwash Grass 0.000000 wetland 0.000000 Impervious 0.000000 Till Forest 0.000000 Till Pasture 0.000000 Till Grass 0.000000 outwash Forest 0.000000 outwash Pasture 0.000000 outwash Grass 0.000000 Wetland 0.000000 Impervious [T] Enter the Analysis TOOLS Module [P] compute PEAKS and Flow Frequencies exist.tsf exist.pks [P] compute PEAKS and Flow Frequencies dev.tsf dev.pks [R] RETURN to Previous Menu [X] exit KCRTS Program Page 1 124th Avenue SE Runoff Cales 5/13/05 Flow Frequency Analysis Time series File:exist.tsf Project Location:sea-Tac ---Annual Flow Rate (CFS) 0.050 0.040 0.060 0.042 0.050 0.053 0.060 0.101 Peak Flow Rates--- Rank Time of Peak 5 8 3 7 6 4 2 1 2/09/01 2:00 1/05/02 16:00 2/27/03 7:00 8/26/04 2:00 10/28/04 16:00 1/18/06 16: 00 10/26/06 0:00 1/09/08 6:00 computed Peaks Flow Frequency Analysis Time series File:dev.tsf Project Location:Sea-Tac ---Annual Flow Rate (CFS) 0.081 0.071 0.099 0.083 0.098 0.086 0.120 0.158 Peak Flow Rates--- Rank Time of Peak 7 8 3 6 4 5 2 1 2/09/01 2:00 1/05/02 16:00 12/08/02 18:00 8/26/04 2:00 10/28/04 16: 00 1/18/06 16:00 10/26/06 0:00 1/09/08 6:00 computed Peaks Flow Frequency Analysis Time series File:devlS.tsf Project Location:sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.162 6 8/27/01 18 00 0.113 8 9/17/02 17 45 0.308 2 12/08/02 17 15 0.131 7 8/23/04 14 30 0.172 5 10/28/04 16 00 0.182 4 10/27/05 10 45 o. 220 3 10/25/06 22 45 0.406 1 1/09/08 6 30 computed Peaks Q ~ -c "16 (o.o() -_ 0,0 7-, sumpks.txt -----Flow Frequency Analysis------- --Peaks --Rank Return Prob (CFS) Period 0.101 1 100.00 0.060 2 25.00 0.060 3 10.00 0.053 4 5.00 0.050 5 3.00 0.050 6 2.00 0.042 7 1.30 0.040 8 1.10 0.087 50.00 0.990 0.960 0.900 0.800 0.667 0. 500 0.231 0.091 0.980 -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 0.158 1 100.00 0.120 2 25.00 0.099 3 10.00 0.098 4 5.00 0.086 5 3.00 0.083 6 2.00 0.081 7 1. 30 0.071 8 1.10 0.145 50.00 0.990 0.960 0.900 0.800 0.667 0. 500 0.231 0.091 0.980 -----Flow Frequency Analysis------- --Peaks --Rank Return Prob (CFS) 0.406 0.308 0.220 0.182 0.172 0.162 0.131 0.113 0.374 Period 1 100.00 0.990 2 25 .oo 0.960 3 10.00 0.900 4 5.00 0.800 5 3.00 0.667 6 2.00 0. 500 7 1. 30 0.231 8 1.10 0.091 50.00 0.980 owj cc o. w 1 { 0.1(,il) -: 0. I\ ~h Page 1 124th Avenue SE Retention/Detention Facility 5/13/05 Type of Facility: Facility Length: Facility Width: Facility Area: Effective Storage Depth: Stage O Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice # 1 2 Height (ft) 0.00 1. 50 Detention Vault 22.48 ft 22.48 ft 505. sq. ft 2.00 ft 0. 00 ft 1011. cu. ft 2.00 ft 12.00 inches 2 Diameter (in) 1.14 0. 73 Full Head Discharge (CFS) 0.050 0. 010 Top Notch Weir: None Outflow Rating Curve: None Pipe Diameter (in) 4.0 Stage (ft) Elevation (ft) 0.00 0.01 0.02 0.04 0.05 (cu. Storage ft} (ac-ft) Discharge (cfs) 0.000 0.004 0.005 0.007 0.008 0.009 0.009 0.010 0.011 0.016 0.019 0.022 0.025 0. 027 0.029 0.032 0.033 0.035 Percolation (cfs) 0 .00 0 .01 0.02 0.04 0. 05 0.06 0.07 0.08 0.10 0 .20 0.30 0. 40 0. 50 0.60 0.70 0.80 0.90 1.00 1.10 1. 20 1. 30 l. 40 l. 50 1.51 1.52 1.53 1.54 1. 55 1. 56 1. 66 1. 76 1. 86 1. 96 2.00. 2.10 2 .20 2. JO 2, 40 2. 50 2. 60 2. 70 2 .80 2.90 3.00 3.10 3.20 0. 06 0. 07 0. 08 0 .10 0.20 0.30 0.40 0. 50 0. 60 0.70 0 .80 0.90 1.00 1.10 1.20 1. 30 1. 40 1.50 1. 51 l. 52 1.53 1.54 1.55 1. 56 1. 66 1. 76 1. 86 1. 96 2.00 2.10 2.20 2.30 2.40 2.50 2. 60 2.70 2 .80 2.90 3 .00 3.10 3 .20 0. 0.000 5. 0.000 10. 0.000 20. 0.000 25. 0.001 30. 0.001 35. 0.001 40. 0.001 51. 0.001 101. 0.002 152. 0.003 202. 0.005 253. 0.006 303. 0.007 354. 0.008 404. 0.009 455. 0.010 505. 556. 607. 657. 708. 758. 763. 768. 773. 778. 783. 788. 839. 8 90. 940. 991. 1011. 1061. 1112. 1162. 1213. 1264. 1314. 1365. 1415. 1466. 1516. 15 67. 1617. 0. 012 0.013 0.014 0.015 0.016 o. 017 0.018 0.018 0. 018 0. 018 0.018 0.018 0.019 0.020 0.022 0.023 0. 023 0.024 0.026 0.027 0.028 0.029 0.030 0. 031 0.032 0.034 0.035 0.036 0.037 0 .037 0.039 0.040 0.042 0.043 0.043 0.045 0.045 0.047 0.047 0.048 0.051 0.054 0.057 0.059 0 .060 0.370 0.935 1. 670 2. 460 2.740 3.000 3.240 3. 460 3.670 3.860 4.050 4.220 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0. 00 0.00 0.00 3. 30 3.30 1668. 0.038 4.400 0 .OD 3 .40 3. 40 1718. 0.039 4.560 0. 00 3 .50 3.50 1769. 0.041 4. 720 0.00 3. 60 3.60 1819. 0.042 4.870 0.00 3. 70 3. 70 1870. 0.043 5.020 0.00 3.80 3.80 1921. 0.044 5.160 0 .00 3. 90 3. 90 1971. 0.045 5.310 0.00 4.00 4.00 2022. 0.046 5. 440 0.00 Hyd Inflow Outflow Peak Storage Target Cale Stage Elev (Cu-Ft) (Ac-Ft) 1 0 .16 ******* 0.16 2 .03 2.03 1027. 0.024 2 0.09 ******* 0.07 2.00 2.00 1012. 0 ;023 3 0.09 0. 06 0.06 2.00 2.00 1011. 0.023 4 0.10 ******;le 0.06 1. BO 1. 80 908. 0.021 5 0.08 ******* 0.05 1. 69 1.69 856. o·.020 6 0.10 0.05 0.05 1. 53 1. 53 775. 0.018 7 0.07 ******"'" 0. 03 0.91 0.91 457. 0.011 8 0.08 ******* 0. 03 0.89 0.89 451. 0.010 ---------------------------------- Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series ·rile: rdout Inflow/Outflow Analysis Peak Inflow Discharge: 0.158 CFS at 6:00 on Jan 9 in Year 8 Peak Outflow Discharge: 0.158 CFS at 7:00 on Jan 9 in Year 8 Peak Reservoir Stage: 2.03 Ft Peak Reservoir Elev: 2.03 Ft Peak Reservoir Storage: 1027. Cu-Ft 0.024 Ac-Ft Flow Frequency Analysis Time Series File;rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.052 5 2/09/01 7:00 0.033 7 1/05/02 17:00 0.055 4 2/27/03 10,00 0.033 8 8/23/04 20:00 0.046 6 10/28/04 19:00 0.068 2 1/18/06 17,00 0.060 3 11/24/06 5:00 0.158 1 1/09/08 7:00 Computed Peaks -----Flow Frequency Analysis------- --Peaks --Rank Return Prob (CFS) (ft) Period 0.158 2.03 1 100.00 0.990 0. 068 2. 00 2 25.00 0. 960 0.060 2. 00 3 10.00 0.900 0.055 1. 80 4 5.00 0.800 0.052 1. 69 5 3.00 0. 667 0.046 1. 53 6 2.00 0.500 0.033 0.90 7 1. 30 0.231 0.033 0 .89 8 1.10 0.091 0.128 2.02 50.00 0. 980 Return Period 10° _ o rdout.pks in Sea-Tac 51 1p 2p + exist.pks 0 -'f') .I.. :.) -Q) 10-1 2l cu .c 0 (/) '.) "' R • • • ~ • • O 00 (c 0 10-2__[__~,-----~----,---~--------,-~~---.-~----,---~.-------~~---.-----~,-----~.-------~~~~~~--.---~,, 1 2 5 10 20 30 40 50 60 70 80 90 95 98 99 Cumulative Probability Treatment Pond Sizing Routine Project: Fleuve des Voiles & Cogger Plats 124th Avenue SE Treatment Pond Date: 5/13/2005 Blue represents manual entry fields Red represents calculated fields Step 1: Wetpool volume factor (f) ... either 3 or 4.5 f= 3 Step 2: Mean annual rainfall (R) ... from Fig. 6.4.1.A, pg 6-69 R= 0.47 in Step 3: Runoff (Vr) ... Vr=(0.9Ai+0.25Atg+0.1 OAtf+0.01Ao)xR/12 Ai= 14,422 sf Atg = 433 sf Atf = O sf Ao= O sf Vr= 513 cf Step 4: Wetpool volume (Vb) ... Vb=fVr Vb= 1,538 cf Step 5: Wetpool dimensions ... Vb=h(A1+A2)/2 Solve by trial & error A1 = 680 sf h = 4 ft S = 0.000001 ft A2 = 680 sf *Vb= 2,720 cf *if Vb calculated in Step 5 < Vb from Step 4, then increase h Drainage Cales FV.xls (Treatment Pond 124th) 5/13/2005 APPENDIX E BOND QUANTITIES WORKSHEET (not included in this preliminary report) RETENTION/DETENTION FACILITY SUMMARY SHEET & SKETCH DECLARATION OF COVENANT (not included in this preliminary report) KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL STORMWATER FACILITY SUMMARY SHEET Development !Ffr:«1/"det U,/e11a35#,cB/sDate QL'lJ')vc Location /22/luff:. 1tJurd 1(/-a,:J Mt1hrn r I ENGINEER Name Finn Address' Phone Developed Site: Acres ,. 7'( r0.9 3 DEVELOPER Name Finn Address Phone Number oflots '? CJ + x' Number of detention facilities on site: Number of infiltration facilities on site: _j___ ponds ~--------'?___L__ ponds _L__ vaults ___ vaults tanks tanks Flow control provided in regional facility (give location) __________________ _ No flow control required Exemption number _______________ _ Downstream Draina~e Basins Immediate Basin A C-~.-1r --L BasinB • -rL-,. J, Basin C Basin D Number & type of water quality facilities on site: ___ biofiltration swale (regular/wet/ or continuous inflow?) __ /_ combined detention/WQ pond I (WQ portior@ip or large?) ~ / combined detention/wetvault ___ compost filter ___ filter strip ___ flow dispersion ___ farm management plan ___ landscape management plan MaiorBasin ___ sand filter (basic or large?) ___ sand filter, linear (basic or large?) ___ sand filter vault (basic or large?) stormwat~and __J__ wetpond e!Y'r large?) ___ wetvault ___ oil/water separator (baffle or coalescing plate?) ___ catch basin inserts: Manufacturer ___________________ _ ___ pre-settling pond ___ pre-settling structure: Manufacturer _____________ ~----- ---flow-splitter catchbasin DESIGN INFORMATION Water Water DESIGN INFORMATION, cont'd 1998 Surface Water Design Manual TOTAL INDIVIDUAL BASIN C D INDIVIDUAL BASIN 1 9/l/98 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Drainage basin(s) A B C D Onsite area t.'<~ fl, :i. '1 Offsite area Tvne of Storage Facility P11n" I/.. . II/. Live Storage Volume 2 fl 7>'17 I ht J Predeveloped RWJoff Rate 2-year 0. 7 c, () . ,;,op1 10-vear O.K r..'2,. n nf".11 JOO-year n \:l' Av /J I /ll Developed rWJoff rate 2-year I. c/ I ,,.. -,,_ .... .. ' 10-vear I• ,'_C, /) ,,,q, 100-vear 2.. f'.<. r'J .. (1 Tvne ofrestrictor "-"' ,,____, Size of orifice/restriction No. I ') I c-' /. ,LI -----·· No.2 I < 1,. .. 0.-Z'? No. 3 No.4 FLOW CONTROL & WATER QUALITY FACILITY SUMMARY SHEET SKETCH All detention, infiltration and water quality facilities must include a sketch per the following criteria: I. Heading for the drawings should be located at the top of the sketch (top right-hand comer). The heading should contain: • North arrow (point up or to left) • D9# • Plat name or short plat number • Address (nearest) • Date drawn ( or updated) • Thomas Brothers page, grid number 2. Label CBs and MHs with the plan and profile designation. Label the control structure in writing or abbreviate with C.S. Indicate which structures provide spill control. 3. Pipes--indicate: Pipe size Pipe length Flow direction Use s single heayyweight line 4. Tanks--use a double, heayyweight line and indicate size (diameter) 5. Access roads • Outline the limits of the road • Fill the outline with dots if the road is gravel. Label in writing if another surface. 6. Other Standard Symbols: • Bollards: • • • • • • • • • Rip rap 000000 000000 Fences --x--x---x--x---x--x-- • Ditches -0--CD-CD-CD 7. Label trash racks in writing. 8. Label all streets with the actual street sign designation. If you don't know the actual street name, consult the plat map. 9. Include easements and lot lines or tract limits when possible. 1 O. Arrange all the labeling or writing to read from left to right or from bottom to top with reference to a properly oriented heading. 11. Indicate driveways or fearures that may impact access, maintenance or replacement. 911/98 1998 Surface Water Design Manual 2 f_ & 'ft~ J! ~ . onsultt'ng WETLAND EVALUATION AND DELINEATION REPORT SOOS CREEK PLAT PROJECT SITE King County, Washington Section 33, Township 23 North, Range 5 East, W.M. prepared for Boston Design and Development 13425 E. Lk. Kathleen Dr. SE Renton, WA 98059 prepared by H & S Consulting P. 0. Box 731695 Puyallup, WA 98373 253 732-6515 mheckert@qwest.net May 26, 2004 • I P. 0. Box 731695 • Puyallup WA 98373 (253) 732-6515 mheckert@qwest.net (360) 893-6779 \ I I \ \ ' ! /. . i l l I -• EXECUTIVE SUMMARY The Soos Creek Plat Project Site is approximately 7.26 acres in total size and located to the east of the City of Renton, King County, Washington. The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with single-family residences, managed and maintained lawns, and unmanaged portions. Onsite assessment of the project site following the procedures outlined in the Washington State Wetlands Identification and Delineation Manual (Wash. Manual) and the Corps of Engineers Wetlands Delineation Manual (1987 Manual) resulted in the identification of two areas that exhibited hydric soils, wetland hydrology, and hydrophytic vegetation consistent with the established criteria of both the Wash. and 1987 Manuals. This assessment, completed in accordance with King County regulations, included an evaluation of the function and value rating for the identified wetlands, a classification of the wetland following the U.S. Fish and Wildlife methods, and an identification of the standard King County buffer width required for these wetlands. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsite -PFOE 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated regulated •connotes wetland continues off-site PFOE palustrine, emergent, seasonally flooded PSSC palustrine, shrub-scrub, seasonally flooded/saturated The U.S. Army Corps of Engineers and King County, as well as a number of other local, state, and federal agencies, regulate activities in and around identified wetland and drainage corridor areas. Such regulations focus on the avoidance of adverse impacts to wetlands, streams, associated buffers and the mitigation of such impacts that cannot be avoided. King County has established criteria to categorize wetlands for purposes of regulation and the establishment of buffers. In addition, King County allows a limited amount of alterations to wetlands (i.e. isolated wetlands, roadway crossings) provided such impacts are mitigated pursuant to an approved mitigation plan. The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. ' < 11 ' -' TABLE OF CONTENTS INTRODUCTION ......................................................................................................... *" .. 1 STUDY PURPOSE. ........................................................................................................ 1 SITE DESCRIPTION ..................................................................................................... 1 BACKGROUND INFORMATION ................................................................................ 2 NATIONAL WETLAND INVENTORY MAPPING .................................................... 2 STATE OF WASHINGTON PRIORITY HABITATS AND SPECIES ....................... 2 STATE OF WASHINGTON STREAM CATALOG ..................................................... 2 KING COUNTY SENSITIVE AREAS MAPPING ....................................................... 2 SOILS MAPPING .......................................................................................................... 2 ONSITE EVALUATION -WETLANDS ....................................................................... 3 WETLAND STUDY METHODS .................................................................................. 3 FIELD OBSERVATION ................................................................................................ 4 WETLAND AND STREAM DETERMINATION ........................................................ 6 WETLAND FUNCTION AND VALUE ASSESSMENT ............................................. 7 ONSITE WETLAND VALUATION ............................................................................. 8 REGULATORY CONSIDERATION ............................................................................ 10 U.S. ARMY CORPS OF ENGINEERS -SECTION 404 ............................................... 10 STATE OF WASHINGTON DEPARTMENT OF ECOLOGY .................................. 11 KING COUNTY -"ENVIRONMENTALLY SENSITIVE AIIBAS" ORDINANCE 21 A.24 ...... 11 SELECTED ACTION PLAN ........................................................................................ 13 FIGURES .......................................................................................................................... 14 REFERENCE LIST ........................................................................................................ 15 APPENDIX A .................................................................................................................. 16 ATTACHMENT 1 .......................................................................................................... 17 111 i -) STANDARD OF CARE Prior to extensive site planning, this document should be reviewed and the wetland boundaries verified by the appropriate resource and permitting agencies. Wetland boundaries, wetland classifications, wetland ratings, and all proposed wetland restoration and enhancement activities must be reviewed and approved by King County and potentially other regulatory staff. The above consultants have provided professional services that are in accordance with the degree of care and skill generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. The consultant is not responsible for design costs incurred before this document is approved by the appropriate resource and permitting agencies. Mark Heckert H & S Consulting • '" ' - INTRODUCTION This. report details the culmination of activities and onsite evaluations undertaken to complete both a wetlands evaluation and a wildlife habitats assessment as an element of the planning and site development of the Soos Creek Plat Project Site. The project area is approximately 7.26 acres in total size and generally located within a quickly urbanizing area east of the City of Renton, King County, Washington (Figure 1). The evaluation and delineation of onsite and adjacent wetlands and drainage corridors is a vital element in the planning and selection of a site development action. The goal of this approach is to assure that planned site platting does not result in adverse environmental impacts to such areas. Wetlands are generally defined as "those areas of King County that are inundated or saturated by ground or surface water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions." (King County Environmentally Sensitive Areas). STUDY PURPOSE This purpose of this document is to present the results of the onsite assessment and evaluation of the wetland/drainage corridor areas and the wildlife habitats within the project area. Included within this report is an assessment of the proposed impacts and compensatory actions to be taken to ensure that proposed onsite actions do not adversely impact environmentally sensitive areas. This study was designed to accommodate site planning and potential regulatory actions. This report is suitable for submittal to federal, state, and local authorities for wetland boundary verification and permitting actions. SITE DESCRIPTION The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with a single-family residence, managed and maintained lawns, and unmanaged portions. The forested portion of the site is dominated by a mixed forested plant community of mature Douglas fir (Pseudotsuga menziesi1) and mature big leaf maple (Acer macrophyl/um). The project site is generally sloping to the east. There is a constructed ditch along the northwestern boundary of the site, to convey surface water from an adjacent development east down the slope. There is no evidence onsite of a continuous stream channel other than the ditch. 031103 Boston 124"' Ave. SE-1 ' -. BACKGROUND INFORMATION NATIONAL WETLAND INVENTORY MAPPING The National Wetland Inventory (NWI) mapping completed by the U.S. Fish and Wildlife Service was reviewed as a part of this assessment. This mapping resource did not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as palustrine, forested, seasonally flooded (PFOC) Palustrine, Scrub- Shrub, Seasonally Flooded (PSSC), and palustrine, emergent, seasonally flooded (PEMC) (Figure 2). STATE OF WASHINGTON PRIORITY HABITATS AND SPECIES The State of Washington Priority Habitats and Species (PHS) Mapping was reviewed as a part of this assessment. This mapping resource identified Big Soos Creek within the immediate vicinity. STATE OF WASHINGTON STREAM CATALOG The State of Washington Stream Catalog for Puget Sound was reviewed as a part of this assessment. This mapping resource did not identify any streams within the project site. Offsite, adjacent to the east, a stream corridor was identified as Big Soos Creek. This creek was identified to provide habitat for resident and anadromous fish species. KING COUNTY SENSITIVE AREAS MAPPING The King County Wetland Inventory was reviewed as a part of this assessment. This mapping resource did not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as Map Folio Wetland 5402, Class 1 (C), 134 acres. This resource also identified Big Soos Creek transecting the wetland as a Class 2S stream. SOILS MAPPING A review of the mapping of soil types within the project area completed by the U.S. Soils Conservation Service (SCS) identified that the onsite soils consist primarily of Alderwood gravelly sandy loam (Soils Survey of King County Area Washington, Nov. 1973). This soil is described as: AgC -Alderwood gravelly sandy loam: This series consists of moderately well drained soils that have a weakly consolidated to strongly consolidated substratum at a depth of 24 to 40 inches. This soil is on uplands and formed in glacial deposits. A typical pedon of Alderwood soils from O -12 inches is dark brown (10YR 4/3) gravelly sandy loam. From 12 to 27 inches the soil is 031103 Boston 124"' Ave. SE -2 Wetland Report grayish-brown (2.5YR 5/2) gravelly sandy loam with many medium, distinct mottles. This soil series is not listed as a hydric soil. ONSITE EVALUATION -WETLANDS WETLAND STUDY METHODS Presently accepted wetland identification is based on a three parameter criteria test as established within both the Corps of Engineers Wetlands Delineation Manual ( 1987 Manual) and the Washington State Wetlands Identification and Delineation Manual (Wash. Manual). These criteria are: 1. A predominance of hydrophytic vegetation. 2. The presence of hydric soils, and ' 3. The presence of wetland hydrology. Initial onsite assessment and evaluation was completed during several site visits in 2003 and 2004. Specific identification of wetland boundaries was completed on December 17, 2003. Assessment transects were established on a north/south pattern through the project area. Wetland assessment within the project site followed the methods and procedures outlined in both the Wash. Manual and the 1987 Manual. Onsite assessment noted that there were no differences in the identified wetland boundaries as a result to using either the Wash. Manual or the 1987 Manual. Drainage corridors were assessed and identified in accordance with the criteria established by King County and the State of Washington Department of Natural Resources (WDNR) Forest Practice Rules (WAC 222-16-030). The site characteristics were assessed on April 2, 2004 with King county staff (N. Gillen) to confirm wetland categorization and discuss mitigation options. The boundary between wetland and non-wetland areas was established by examining the transitional gradient between wetland criteria along transects through the site. Delineation was performed using the routine methodology for areas greater than f,ve acres as detailed in the 1987 Manual. Field data sheets are provided in Appendix A. Identified boundaries were marked in the field with number flagging. These boundaries were then surveyed and made a part of the site plan mapping. 031103 Boston 124'" Ave. SE -3 Wetland Report FIELD OBSERVATION • Vegetation The dominant onsite species was Douglas fir and big leaf maple. These mature trees formed open stands across the treed portion of the site. Additional tree species occurring onsite included Western red cedar (Thuja p/icata), Western hemlock (Tsuga heterophylla), red alder (A/nus rubra), black cottonwood (Popu/us trichocarpa), cherry (Prunus spp), and cascara (Rhamnus purshiana). The understory included a wide variety of shrubs and herb species including vine maple (Acer circinatum), salal (Gaultheria shal/on), Oregon grape (Berberis spp.), hazelnut (Cory/us comuta), salmonberry (Rubus spectabilis), Scot's broom (Cytisus scoparius), Himalayan blackberry (Rubus procera), evergreen blackberry (Rubus /aciniatus), Pacific red elderberry (Sambusus racemosa), snowberry (Symphoricarpus a/bus), bracken fern (Pferidium aquilium), and sword fern (Po/ystichum munitum). Throughout the project site this plant community had been altered by prior, management actions. This plant community was identified as non-hydrophytic (i.e. typical of non-wetlands). In the northwestern portion of the site, at the northwest corner, an isolated depression occurs. The plant community in this area is shrub-scrub, dominated by salmonberry, spiraea (Spiraea douglasi1), slough sedge (Carex obnupta), buttercup (Ranuncu/us repens), reed canarygrass (Phalaris arundinacea), softrush, and lady fern (Athyrium fi/ix-femina), with alder (A/nus rubra) saplings occurring intermittently. . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). Offsite to the east a large stream corridor occurs. The plant community in this area is shrub-scrub, dominated by red-osier dogwood (Camus stolonifera), spiraea (Spiraea doug/asit), salmonberry, Sitka willow (Salix sitchensis), slough sedge (Carex obnupta}, buttercup (Ranunculus repens), and willow-weed (Po/ygonum lapathifolium). . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). • Soils As identified by numerous sample plots throughout the project site,. the majority of the site exhibited a soil profile typical of the Alderwood soil series. The soil w~s defined as gravelly sandy loam with a soil matrix color of dark brown (10YR 3/3) to brown (10YR 4/4). These soils did not exhibit redoximorphic features such as prominent soil mottles, oxidized root channels, or glayed soil layers within the first 20 inches of soil depth. The majority of the project site exhibited soil which would not be considered "hydric." Representative sample plots are identified. (Special note -many more sample plots were completed during the field assessment than are reported within Appendix A). Sample plots within the defined isolated depression exhibited a mixed gravelly loam soil texture. These soils appeared to be mineral in character. Soils ranged in color from very dark brown (10YR 3/1) to dark grayish brown (10YR 4/2). Redoximorphic features 031103 Boston 124"' Ave. SE -4 Wetland Report were present and often very prominent. Soils within these areas exhibited "hydric" characteristics. • Hydrology Onsite hydrology appeared to be the result of seasonal stormwater runoff from onsite and adjacent properties. In addition, the pattern of surface water movement appeared to have been modified by prior land use activities. These activities have included the development of offsite homesites, the development of roadways and utilities, and the placement of culverts. The general movement of surface water runoff across the site was generally to the east. Surface water through the site was captured in boundary and roadside ditches which occur at the north and south boundaries of the site. Within the isolated depression, evidence of seasonal soil saturation was documented. This area was in a small depression, and had been impacted by prior land use actions (i.e. grazing, compaction, pasture management). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. This depression apparently drained to the ditch which flows east along the northern boundary of the site. Within the stream corridor area located offsite to the east of the site evidence of seasonal soil saturation was also documented. This area was part of a large wetland complex, and had been impacted by prior and on-going land use actions (i.e. utility corridor development). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. 031103 Boston 124"' Ave. SE -5 Wetland Report WETLAND AND STREAM DETERMINATION Wetland determination was based on sample plots which contained hydrophytic vegetation, hydric soils, and wetland hydrology in accordance with the 1987 Manual and the Wash. Manual. Based on these methods two wetland areas were identified onsite (Attachment 1). No area was identified onsite to exhibit characters typical of a "stream" (i.e. a continuous pattern of surface water movement, either permanent or intermittent). Also one arEla, noted to have been intentionally created in an upland area, captured residential runoff. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsile -PFOE ·.,, 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated reoulated *connotes wetland continues off-site PFOE palustrine, emergent, seasonally flooded PSSC palustrine, shrub-scrub, seasonally flooded/saturated Wetland A: This wetland was identified within a large wetland/stream complex off-site to the east of the project site. This wetland was dominated by a shrub -scrub plant community adjacent to the project site, and was forested further away from the site. This plant community was managed apparently to maintain the utility corridor access and maintenance road. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of topography. Wetland A was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as palustrine, shrub-scrub, seasonally flooded/saturated (PSSE). Based on the size of the wetland, association with a Class 2(S) stream, and the forested plant community this wetland complex was identified to meet the criteria for designation as a King County Class 1 Wetland. The standard buffer for a Class 1 Wetland is 100 ft. as measured perpendicular to the wetland edge. Wetland B: This wetland was identified within an isolated depression in the northwest comer of the project site. This wetland was dominated by a shrub-scrub plant community. This wetland was hydrologically supported by road and roof runoff conveyed by a ditch from an off-site single-family residence. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of topography and roof runoff. Wetland B was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as p,;1lustrine, scrub-shrub, seasonally flooded/saturated (PSSE). Based on the size of the wetland and the shrub-scrub plant community this wetland was 031103 Boston 124"' Ave. SE -6 Wetland Report identified to meet the criteria for designation as a King County Class 3 Wetland. However, since this wetland is smaller than 2,500 sq. ft. in total size, this wetland is apparently not regulated by King County. WETLAND FUNCTION AND VALUE ASSESSMENT Wetlands are known to perform significant roles in the ecosystem, some of which are of immediate value to society. These roles vary greatly with the size, type, hydrology, vegetation, and location of wetland areas. Although the ecological functions performed by this wetland are complex, interrelated, and difficult to assess and quantify, methods have been developed for the U.S. Army Corps of Engineers (Adamus et al. 1987: Reppert et al. 1979). The functions provided by wetlands include hydrologic support, shoreline protection, stormwater and floodwater storage, water quality, groundwater recharge, and provision of wildlife habitat. The HYDROLOGIC SUPPORT FUNCTION is defined by the measure of hydrologic stability and environmental integrity which the wetland provides. This function is measured by the frequency of inundation and saturation by tidal actions, stream flow, runoff, and precipitation. Wetlands permanently inundated or saturated, or intertidal wetlands are valued as high. Medium valued wetlands are seasonally flooded or are open water systems that remain saturated during most of the growing season. Wetlands that are intermittently flooded or hydrologically isolated are considered of low value. The SHORELINE PROTECTION FUNCTION is defined by the measure of shielding from wave action, erosion, or storm damage which a wetland provides. This function is measured by the location and width of the wetland along shoreline areas, types of vegetation present, and the extent of development along the shoreline. A high value is given to wetlands along a shoreline that have a width greater than 200 yards and dense woody vegetation. A medium value is given to a wetland with a width of 100 to 200 yards, sparse woody vegetation, and dense emergent vegetation. Wetlands less than 100 yards in width and emergent or lacking vegetation are considered of low value. The STORMWATER AND FLOODWATER STORAGE FUNCTION is defined by the ability of a wetland to store water and retard .flow during periods of flood or storm discharge. Wetlands of larger size are generally considered to have greater ability to provide this function. In addition, wetlands nearer to urban or potentially develop-able areas are also considered to provide greater flood protections than wetlands which are in undeveloped areas. The WATER QUALITY FUNCTION is defined by the physical, biological, and chemical processes which wetlands provide to naturally purify water. This function removes organic and mineral particulates through natural filtration. In general, wetlands of greater size, more dense vegetation, and those which are 031103 Boston 124"' Ave. SE -7 Wetland Report close to point sources of pollution are considered to be of higher value. Wetlands which are small (<5 acres), lacking dense vegetation, and not close to point or non-point sources of pollution are considered of low value. The GROUNDWATER RECHARGE FUNCTION is defined by the interaction of the underlying geology and soils, and the surface topography. This function provides for the movement of surface water into groundwater systems. Important to this function is wetland size, period of inundation, and depth of standing water within the wetland. High value is given to permanently inundated wetlands greater than 10 acres in size. Medium value is given to wetlands which are seasonally flooded and 5 to 10 acres is size. Wetlands less than 5 acres in size, isolated, and temporarily saturated are considered of low value. The NATURAL BIOLOGICAL FUNCTION is defined by the complexity of physical habitats and biological species within the wetland area. The value given to a wetland depends upon its ability to provide habitat for nesting (spawning), incubation, feeding, rearing, and cover of aquatic and terrestrial animal and fish species. In addition, the ability of a wetland to provide support for varying food chains is an important element in value assessment. Wetlands of high species diversity, three or more habitat types, unique habitat features, large in size, and associated with a permanent stream or tidal marsh are considered of high value. Wetlands with moderate species diversity, two habitat types, moderate in size, and associated with an intermittent stream or high salt marsh are considered of medium value. A low value is given to wetlands of low species diversity, small size, and isolated. These six functions are rated low, moderate, or high, based on the criteria outlined above. These criteria are guidelines compiled from Adamus (1987) and Reppert (1979) and professional judgment must be exercised in assessing these criteria. Overall values for a wetland are assigned, based on a synthesis of individual values. In addition to intrinsic functions, extrinsic functions are also recognized. These extrinsic functions provide social values that have indirect benefits to wetlands. Education and recreational opportunities are most often mentioned as extrinsic functions. Associated values are often subjective and are thus difficult to evaluate. As such, these functions are not rated, but are nonetheless important when considering creation, restoration, or enhancement projects. ONSITE AND OFFSITE WETLAND VALUATION Following the function and value assessment process noted above Wetland A (Located offsite) was rated as exhibiting a High rating: • Water Quality Benefits -This wetland was part of a large complex associated with Big Soos Creek. This complex had been impacted by prior and on-going utility corridor land management. This wetland appeared to retain more than 50% of the runoff which occurred within the local area. This 031103 Boston 124"' Ave. SE-8 Wetland Report wetland also exhibited a wide vegetation diversity. The primary water quality benefit provided by This wetland was a significant amount of biofiltration of surface stormwater. • Stormwater Storage -This wetland are part of a large wetland complex and had been impacted by prior land uses. These wetland was located in a rapidly developing part of King County. This wetland was large exhibited a substantial capacity to store stormwater. • Hydrologic Support -This wetland appeared large, and noted to pond a substantial amount of surface water throughout the growing season. Evidence of seasonal ponding.and saturation to the surface was significant. • Groundwater Recharge -This wetland appeared large, and to pond a significant amount of surface water throughout the growing season. Evidence of seasonal ponding and saturation to the surface was substantial. • Natural Biological Function -This wetland was large, and exhibited an extensive range of plant diversity and vegetation complexity. Unique habitat features (i.e. snags, fallen trees, mature trees along the wetland boundary) were limited adjacent to the project site. Following the function and value assessment process noted above Wetland B were rated as exhibiting a low rating: • Water Quality Benefits -This wetland was small and had been impacted by prior grazing and pasture and land management. This wetland appeared to retain less than 25% of the runoff which occurred within the local area. This wetland also exhibited a limited vegetation diversity as a result of prior grazing and land use. The primary water quality benefit provided by This wetland was a very limited amount of biofiltration of surface stormwater. • Storrnwater Storage -This wetland appeared within a topographic depression and had been impacted by prior land uses. T_his wetland was located in a rapidly developing part of King County. This wetland was small and exhibited a very limited ability to store stormwater. • Hydrologic Support -This wetland appeared small, and noted to pond a limited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surface was limited. • Groundwater Recharge -This wetland appeared small, and to pond a limited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surface was limited. 031103 Boston 124"' Ave. SE -9 Wetland Report • Natural Biological Function -This wetland was small, and exhibited a very limited range of plant diversity and vegetation complexity. Unique habitat features (i.e. snags, fallen trees, mature trees along the wetland boundary) were absent. ' REGULATORY CONSIDERATION The proposed alteration of lands defined by various federal, state, and local authority rules and regulations as "wetlands" raises environmental concerns that are generally addressed in the development review process. These concerns center around the development's potential adverse impacts to the structure, function, value, and size of these "wetland" areas. Such adverse impacts may include a reduction in wildlife habitats, reduced surface water quality, reduced water retention, a reduced ground water recharge rate, reduced plant species diversity, and the reduction in the function and value of other associated wetland and non-wetland characteristics. U.S. ARMY CORPS OF ENGINEERS -Section 404 Section 404 of the Clean Water Act (33 U.S.C. 1344) prohibits the discharge of dredged or fill material into 'Waters of'the United States" without a permit from the Corps of Engineers (Corps). The Corps has jurisdiction over freshwater systems waterward from the ordinary high water line of a water body or waterward from the upland boundary of the adjacent wetland. The definition of fill materials includes the replacement of aquatic areas with dry land, grading which changes the surface contour of a wetland, and mechanized land clearing in wetlands. For the purposes of Section 404 permitting the Corps makes the final determination as to whether an area meets the wetland definition and would be subject to regulation under the Corps program. Currently the Corps has two specific types of permits which apply to wetland fill proposals. Ttriese two types are a series of specific Nationwide Permits and the Individual Permit. The Nationwide Permit process identifies specific categories of work that can be undertaken following a set of specific conditions applicable to each Nationwide Permit number. For example; NWP#12 allows for the limited, short term impacts to wetlands for the placement of utilities, and NWP#14 allows for a limited impact to wetlands as a part of the development of a roadway crossing. The Corps has · noted several times within information papers, documents, and workshops that a project proponent that places fill within a wetland without specific Corps authorization does so at the proponent's own risk. The Corps requires an Individual Permit where a proposed activities within an identified jurisdictional wetland area can not be authorized under one of the Nationwide Permits. Within the Individual Permit process the Corps undertakes a much more in- depth review of the proposed project and the proposed impacts. The Corps must evaluate whether the benefits derived from the project outweigh the foreseeable environmental impacts of the project's completion. 031103 Boston 124"' Ave. SE-10 Wetland Report STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Proposed action undertaken through either of the Corps of Engineers processes (Nationwide, Individual, or isolated) are also subject to the provisions of the Washington State Department of Ecology Water Quality Certification Process. Projects that may be exempt from Corps of Engineers Section 404 jurisdiction may still require review by the Washington State Department of Ecology to ensure consistency with State water quality protection provisions. KING COUNTY -"Environmentally Sensitive Areas" Ordinance 21A.24 • Wetland and Stream Classes King County regulates activities in and around wetland areas. Such regulations also require that an undisturbed native vegetation buffer be retained along the upland side of the identified wetland areas. To assist in this regulation the County has defined classes by which to regulate wetlands, streams, and their associated buffer area. These categories are based on such features as size; the presence of endangered or threatened plants, fish, or animals; regionally rare wetlands; wetlands of local significance for wildlife or stormwater functions; the number of wetland classes and subclasses; and percentage of open water. A Class 1 Wetland means a wetland assigned the Unique/Outstanding rating in the King County Wetlands Inventory; or any wetland which meets any of the following criteria: 1. The presence of species listed by the federal government or state as endangered, or threatened, or the presence of critical or outstanding actual habitat for those species; 2. Wetlands having 40% to 60% permanent open water in dispersed patches with two or more classes of vegetation; 3. Wetlands equal to or greater than ten acres in size and having three or more wetland classes, one of which is open water; or 4. The presence of plant associations of infrequent occurrence. A Class 2 Wetland means a wetland assigned the Significant #2 Rating in the King County Wetlands Inventory; or any wetlands which meet any of the following criteria: 1. Wetlands greater that one acre in size; 2. Wetlands equal to or less that one acre in size and having three or more wetland classes; 3. Wetlands equal to or less than one acre that have a forested wetland class; 4. The presence of heron rookeries orraptor nesting trees. 031103 Boston 124"' Ave. SE· 11 Wetland Report A Class 3 Wetland means a wetland assigned a Lesser Concern #3 Rating in the King County Wetlands Inventory, 1983, or uninventoried wetlands that area equal to or less than one acre in size and that have two or fewer wetland classes. King County does not regulate wetlands less than 2,500 square feet in total size within the Urban Growth Boundary of King County. King county defines "Streams• as those areas in King County where surface waters produce a defined channel or bed, not including irrigation ditches, canals, storm or surface water run-off devices or other entirely artificial watercourses, unless they are used by salmonids or are used to convey streams naturally occurring prior to construction in such watercourses. • Required Buffers King County has established a standard buffer to be applied to a wetland or stream to assure protection of the wetland function and value. This buffer area is measured perpendicular to the defined wetland edge or perpendicular to the identified ordinary high water mark of a stream. WETLAND STANDARD BUFFER ~ CLASS WIDTH 1 100 feet 2 50 feet 3 25 feet King County allows. the standard buffer to be modified where such actions would provide additional protection to wetlands or enhance the wetland's functions (21A.24.320.B). Buffer averaging may be allowed as long as the total area contained in the buffer on the development proposal site does not decrease and the minimum width of the final buffer is not less than 65% of the standard buffer width. 031103 Boston 124"' Ave. SE -12 Wetland Report • SELECTED ACTION PLAN The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. A primary feature in the creation of these homesite lots will be the establishment of a protective buffer adjacent to the identified offsite wetland consistent with the King County Environmental Sensitive Areas Ordinance. Wetland B will be filled in accordance with King County regulation. Preliminary development and mitigation plans are submitted by the owner (Boston Design & Development) as an attachment to this report. · 031103 Boston 124"' Ave. SE -13 Wetland Report FIGURES 031103 Boston 124"' Ave. SE -14 Wetland Report 0318 03~5.· f cnJO OUlO~ 01,0 _______ SE 1Ql.H_SJ. ______ _ 0223 02:Hi 0201 02()3 o,o,, 0222 0200 0202 02:.:ii' .0245 ____ 0,.4 0242 !:!I j 0300 -0~4~ 0021' 0021 002:f 0~00 00'9 CO!JO l"80 0,26 0126 0127 OM2 0186 02m / 0'"" 0240 02<1t {.rj35 /'I 1 Legend Selected Features c-, ,N Streets C!~ 2 .?tr-en-i.:,. Pa.reel ;V Ct=s 2 &-:1:moend ;V Fish and Ditch ,N CiazJ Wildlife Notm,11< Urrj-a2-.died SAO Stream ml SAO VVelJand ,:ocrr.: A 1.Bl,;:: .. ,-.. & ,'I' ~ ~~ onsulting t "''" i C'.M2 ~ 004' 0040 00..S • 'i 0024 9004 902S 90/4 9034 0 . N "' E Figure 1. Site Vicinity And King County Wetlands Map Soos Creek Plat • • • 49.a, • • • • • • --, . • 0.06 /\I Rent~n nwi Renton nw1 C]PEMC • . " . 0 PEMF PFOC CJPSSC w • N E s 0.06 0.12 Miles Figure 2. Soos Creek Plat NWI Map I REFERENCE LIST Adamus, P.R., E.J. Clairain Jr., R.D. Smith, and RE. Young. 1987. Wetland Evaluation Technique (WET); Volume II: Methodology, Operational Draft Technical Report Y-87, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Office of Biological Services, U.S. Fish and Wildlife Service, U.S. Department of the Interior, FWS/OBS-79/31. Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1, US army Engineer Waterways Experiment Station, Vicksburg, Miss. Hitchcock, C.L., A. Cronquist. 1977. Flora of the Pacific Northwest. University of Washington Press. Seattle, Washington. Homer, R.R. and K.J. Raedeke. 1989. Guide for Wetland Mitigation Project Monitoring. Washington State Department of Transportation. contract number GC8286, task 6. King County Department of Natural Resources. 1993. DRAFT Wildlife Management in King County: Issue Paper. Mikol, S.A. 1980. Field Guidelines for Using Transects to Sample Nongame Bird Populations. U.S. Fish and Wildlife Service publication FWS/OBS -80/58. Reppert, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Meyers. 1979. Wetland Values -Concepts and Methods for Wetland Evaluation. Research Report 79-R1, U.S. Army Corps of Engineers, Institute for Water Resources, Fort Belvoir, Virginia. U.S. Department of Agriculture, Soils Conservation Service. Soils Survey of King County Area Washington, Nov. 1973. Washington State Department of Ecology. 1997. Washington State Wetlands Identification and Delineation Manual. Publication Number 96-94. Washington State Department of Fisheries, Catalog of Washington Streams and Salmon Utilization, Volume 1., 1975 031103 Boston 124"' Ave. SE-15 Wetland Report APPENDIX A FIELD DATA FORMS 031103 Boston 124'" Ave. SE -16 Wetland Report Data Form Routine Wetland Determination Project/Site: Boston 124th Ave. SE ApplicanVOwner: Boston lle$ign & Development Co. Investigator: M. Heckert [XI Do normal circumstances exist on the site? [ J Have vegetation, soils, or hydrology been disturbed? ( ] Is Hie area a potential problem area? Vegetation Dominant Species ttwP@cepys X Pha/am, arondlnacea ~ Oemmia cerasifom!is X Rubus anneniscus Im Common Name Grass.Reed Canary Indian Plum Blackberry.Himalaya X A/nus rubra Alder Red % Species that are OBL, FACW, or FAC(except FAC-): 50 Remarks appears to drain well Job Number: 031103 City: none Welland Data Point SP 1 Date: December 17, 2003 County: King State: Wa Community ID: Forest Station ID: Plot ID: 50 25 50 66 Cowardin Classification: FA<NV FACU FACU FAC Hydrology [ J Recorded Data (describe in remarks) ( J Stream, Lake, or Tide Gage Primary Wettand Hydrology lnd/cators [ ] Inundated Secondary Hydrology lnd/cators [ J Oxidized root channels [ I Aerial Photograph [ J Other (describe in remarks) F,eld Observations: Depth of Surface Water(in.): O Depth lo Free Water In Ptt(in.): >24 Depth lo Saturated Soils(in.): >24 Remarks appears to drain well Soils [ I Saturated In upper 12 inches [ I Water marks [ I Drift Hnes [ J Sediment depostts [ J Drainage patterns in wetlands [ J Water-stained leaves [ J Local soil survey data [ J FAC-Neutral test [ I OH1er (explain in remarks) Depth (in.) Hor. Matrtx Color Mottle I 2nd Mottle Texture, Structure, etc. Color Abundance Contrast ~ 6-18 A 10YR3/2 B 10YR 3/3 Hydric Soils Indicators [ J Hlstosol [ J Histic Epipedon [ J Sulfidlc Odor [ J Probable Aquatic Moist Regime [ I Reducing Condttions [ J Gleyed or Low-Chroma Colors UM Name: Drainage Class: Remarks appears to drain well Wetland Determin•tion [ I Hydrophytic Vegetation Present [ J Hydrte Soils Present [ J Wetland Hydrology Present Remarks fill wetland crtterta NOT met appears to drain well J Concretions Coarse Sandy Loam srones Coarse Sandy Loam stones J High Organic % in Surface Layer I Organic Stntaking ) Listed on Local Hydrtc Soils List J Listed on Nattonal Hydlic Soils List J other (explain in remarks) Taxonomy: [ J Field Obseivatlons mateh map [ I This Data Point is a Wetland PaQe 1 of 10 Data Fonn Routine Wetland Detennination Project/Sile: Boston 124th Ave. SE Applicant/Owner. Boston Design & Development Co. Investigator: M. Heckert [X) Do normal circumstances exist on the site? [ I Have vegetation, soils, or hydrology been disturbed? [ J Is the area a potential problem area? Job Number: 031103 City: none Wetland Data Point SP 2 Date: December 17, 2003 County: King State: Wa Community ID: Station ID: Plot ID: Vegetation Dominant Species Common Name % Cover Indicator Harbaceous X Pha/Brls anmdinacea Gress.Reed Canary ~ Rubus spactabilis Berry,Salmon X Spiraea doualssi/ Splraea,Douglas' % Species that are OBL, FACW, or FAC(except FAC-): 100 Remarks appears to drain poorly 90 25 25 Cowardin Classification: psse FACW FAC FACW Hydrology [ I Recorded Data (describe In remarks) [ ] Stream, Lake, or Tide Gage Primary WeYand Hydrology Indicators [ I Inundated Secondary Hydrology Indicators [X) Oxidized root channels [ I Aerial Photograph [ I Other (describe In remarks) Field Observations: Depth of Surface Water(in.): O Depth to Free Water in Pit(in.): 12 Depth to Saturated Soils(in.): 12 Remarks appears to drain poorly Soils [XI Saturated in upper 12 inches [XI Water marks [ I Drift lines [XI Sediment deposits [ I Drainage patterns in wetlands [ I Water-stained leaves [ J Local son survey data [ J FAC-Neutral test [ I Other (explain. In remarks) Depth Hor. (in.) Matrix Color Mottle I 2nd Mottle Texture, Structure, etc. COior Abundance contrast 0-6 A 6-18 B 10YR312 10YR313 Hydric Soils Indicators [ I Hlstosol [ J Hlstlc Eplpedon [ J Sulfidlc Odor 10YR5/6 [X] Probable Aquatic Moist Regime [X) Reducing Conditions [X) Gleyed or Low-Chroma Colors Unit Name: Drainage Class: Remarks appears to drain poorly Wetland Determination [XI Hydrophytlc Vegetation Present [XI Hydrlc Soils Present [X] Wetland Hydrology Present Remarks fill wetland criteria MET appears to drain poorly wlA A1 toA22 common distinct [X] Concretions Coarse Sandy Loam cobbles Coarse Sandy Loam stones [ J High Organic % In Surface Layer [X) Organic Streaking [ J Listed on Local Hydric Soils List [ I Listed on National Hydrlc Soils List [ J Other (explain in remarks) Taxonomy: [ J Field Observations match map [XI This Data Point Is a Wetland Paae2 of10 Data Form Routine Wetland Determination Project/S~e: Boston 124th Ave. SE Applicant/Owner: Boston Design & Development Co. Investigator: M. Heckert Job Number: 031103 City: none Wetland Data Point SP 3 Date: December 17, 2003 County: King State: Wa [XI Do nom,al circumstances exist on U,e site? [ ] Have vegetation, soils, or hydrology been disturbed? [ ] Is U,e area a potential problam area? Community ID: Palustrlan shrub' Station ID: Plot ID: Vegetation Dominant Species Common Name % Cover Indicator Herb§c,eus X Phalaris arundinaoea Grass.Reed Canary ~ 90 FACW X Sa/ix sitchensis WIiiow Sitka 70 FACW % Species that are OBL, FACW, or FAC(except FAC-): 100 Remarks Cowardin Classification: pssc appears to drain poorly Hydrology [ ] Recorded Data (describe In remarks) [ ] Stream, Lake, or Tide Gage [ ] Aerial Photograph ( ] other (describe in remarks) Field Observations: Depth of Surface Water(in.): o OepU1 to Free Water in Pit(in.): 6 OepU1 to Saturated Soils(ln.): 6 Remarks appears to drain poorly Soils Primary Wetland Hydrology Indicators ( ] Inundated [X] Saturated In upper 12 inches [ ]Watermarks [ ] Drift lines [XI Sediment deposits [XI Drainage patterns in wetlands . Mottle I 2nd Mottle Secondary Hydrology Indicators [X] Oxidized root channels [XI Water-stai.ned leaves [ ] Local soil survey data [ ] FAC-Neutral test [ I other (explain in remarks) OepU1 Hor. (In.) Matrix· Color 10YR 3/1 10YR4/1 Color Abundance Contrast Texture, Structure. etc. 0-6 A 6-18 A/B Hydrfc Soils Indicators ( I Histosol ( ] Hislic Epipedon [ I Sulfidic Odor 10YR5/6 [ ] Probable Aquatic Moist Regime [ ] Reducing Conditions ( ] Gloyed or Low-Chroma Colors Unit Nama: Drainage Class: Remarks appears to drain poorly Wetland Determination {XI Hydrophylic Vegetation Present [Xl Hydnc Soils Present [X] Wetland Hydrology Present Remarks common distinct [ ] Concretions Coarse Sandy Loam pebbles Loamy Sand stones [ ] High Organic % In Surface Layer [ ] Organic Streaking [ ] Usted on Local Hydrfc Soils List [ ] Listed on Nallonal Hydrtc Solis List [ ] other (explaln in remarks) Taxonomy: [ I Field Obaervallons match map [X] This Date Point is a Wetland on edge wetland crnerta MET appears to drain poorly Paae 3of 10 Data Form Routine Wetland Determination Project/Site: Boston 124th Ave. SE Applicant/Owner: Boston Design & Development Co. Investigator: M. Heckert (XI Do normal circumstances exist on the sile? ( J Have vegetation, eoils, or hydrology been dlsturt>ed? ( I ls the area a potential problem area? Vegetation Job Number: 031103 City: none Wetland Data Point SP 4 Date: December 17, 2003 County: King State: Wa Community ID: Station ID: Plot ID: Dominant Species Common Name % Cover Indicator tt,n,aceous X Phalaris arundlnaoea Grass.Reed Canary 80 FACNV ~ Rubus armeniacus Blackberry,Hlrnalaya 25 FACU X Salix hookerana Willow.Hooker 6 FACW- X Populus trichocarpa Cotton-Wood. black 40 FAC % Species that are OBL, FACW, or FAC(exoept FAC-): 75 Remarks Cowardln Classification: PSS-PFO appears to drain poorly Hydrology ( J Recorded Data (describe in remarks) ( J Stream, Lake, or Tide Gage ( I Aerial Photogreph ( J Other (describe in remarks) Field Observations: Depth of Surface Water(in.): O Depth to Free Watar in Pi~in.): 3 Depth to Saturated Soils(in.): 3 Remarks appears to drain poorly Soils Primary wetland Hydrology Indicators ( ! Inundated (XI Saturated In upper 12 Inches (XI Water marks ( J Drift lines ( I Sediment dapo&its (XI Drainage patterns in wetlands Secondary Hydrology Indicators (XI Oxidized root channels [ I Water-stained leaves [ J Local soil survey data [ J FAC-Neutrai test ( I Other (explain in remarks) Depth (In.) Hor. Matrix Color MoUle I 2nd Mottle Texture, Structure etc. Color Abundance Contrast distinct 0-16 AIB 10YR4/2 1 OYR 5/6 common Coarse Sandy Loam pebbles Hydric sons Indicators [ J Histosol [ J Histic Epipedon [ I Sulfldic Odor (XI Probable Aquatic Moist Regime [XI Reducing Conditions [XI Gleyed or Low-Chroma Colors Unil Name: Drainage Class: Remarks appears to drain pootty Wetland Determination [XI Hydrophytic Vegetation Present (XI Hydric Soils Present (XJ Wetland Hydrology Present Remarks wetland crtteria MET appears to drain poorly ! I Concretions I I High Organic % in Surface Layer (XJ Organic Streaking ( J Listed on Local Hydric Soils List [ J Listed on National Hydric Soils List ( I Other (explain In remarks) Taxonomy: [ ] F'ield Observations match map [XI This Data Point is a Wetland Paae 4 of 10 i t I t. Data Fonn Routine Wetland Detennination Project/Stte: Boston 124th Ave. SE Applicant/Owner: Baston Design & Development Co. Investigator: M. Heckert Job Number: 031103 City: none Wetland Data Point SP 5 Date: December 17. 2003 County: King Stata: Wa [XI Do normal circumstances exist on the site? [ J Have vegetation, soils, or hydrology been disturbed? [ I Is the area a potential problem area? Community ID: Paluatrtan shrub/ Station 10: Vegetation Dominant Species Common Name t(adPacaqus X PhelBtis erundlnacea Grass, Reed Canary ~ Spiraea douglasii Splraea,Oouglas' X SaHx silchensis Willow,Sitl<a X watar birch Plot ID: % Covet Indicator 90 30 25 21 FACW FACW FACW % Species that are OBL, FACW, or FAC(except FAC.): 75 Remarks Cowardin Classification: puc appears to drain poorly Hydrology [ I Recorded Data (describe In remarks) [ I Stteam. Lake, or Tide Gage [ I Aertal Photograph [ J Other (describe in remarks) Field Observations: Depth of Surface Water(ln.): o Depth to Free Water in Pil(in.): 8 Depth to Saturated Soils(ln.): 8 Remarks appears to drain poorly Soils Primary Wettand Hydrology Indicators [ I Inundated [XI Saturated in upper 12 inches [XI Water marks [ I Drift lines [ I Sediment deposits [ I Drainage patterns in weUands Mottle / 2nd Mottle Seoondsry Hydro/oQy Indicators (X]Oxidized root channels [XI Water-stained leaves [ I Local soil survey data [ ] FAC.Neutral test [ l Other (explain in remarks) Depth Hor. (in.) Matrix Color Color Abundance Contrast Texture, Structure. etc. 0-16 />J8 10YR,4/2 1 OYR 516 common distinct Loamy Sand Hydric Soils Indicators [ J Histosol [ J Hlsllc Eplpedon [ I Sulfldlc Odor [ I Probable Aquatic Moist Regime ( I Reducing Condttions ( J Gleyed or Low-Chroma Colors Unlt Name: Drainage Class: Remarks appears to drain poorly Wetland Determination [X] Hydrophytlc Vegetation Present [XI Hydrlc Soils Present [XI Wetland Hydrology Present Remarks weUand criteria MET appears to drain poorly J Concretions J High Organic % In Surface Layer J Organic Streaking J Listed on Local Hydric Soils List J Listed on National Hydrlc Soils List I Other (explain In remarks) Taxonomy: [ J Field Observations match map [XI This Data Point Is a WeUand Paae5of 10 • • • ATTACHMENT 1 WETLAND DELINEATION MAP 031103 Boston 124 .. Ave. SE-17 Wetland Report DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT City of I ADDENDUM TO ENVIRONMENTAL (SEPA) DETERMINATION OF NON-SIGNIFICANCE (DNS-M) -MITIGATED Pursuant to WAC 197-ll-600(4)(c) and WAC 197-11-625 Addendum to the Cogger Short and Fleuve de Voiles Plats as Addended by the City of Renton (LUA09-052 and LUA09-016) Determination of Non-Significance -Mitigated (DNS-M) ,, -• Date of Addendum: Date of Original Issuance of SEPA Threshold Determination: July 23, 2012 November 9, 2006 Proponent: Project Numbers: Project Names: Charles Spaeth LUA09-052, ECF, PP LUA09-016, SHPL·A Fleuve de Voiles Plat and Cogger Short Plat Proposal/ Purpose of Addendum: The applicant, Charles Spaeth, received approval for a 39- lot plat (Fleuve de Voiles) from King County Department of Development and Enviromental Services (KC DDES) for Environmental (SEPA) Review and a Preliminary Plat (KC DDES File No. L04P0002). The 6.8 acre parcel is located within the City's Residential -4 (R-4) dwelling units per acre zoning classification; however, the project is vested to King County's R-6 zoning development regulations. In addition the same applicant received approval for an adjacent eight lot short plat, Cogger Short Plat, from KC DDES (LOSS0040). The Cogger Short Plat is also located within the City's R-4 zoning classification; however, it is also vested to King County's R-6 zoning development regulations. The Cogger Short plat's access is dependent on the Fleuve de Voiles plat improvements and could not be developed without the public and private infrastructure of the larger plat. As a result, KC DDES combined the two applications into one "development" for the purposes of SEPA review. The proposed plat of Fleuve de Voiles has as its sole access a new improvement of the SE 192"d St and 1241h Ave SE intersection. As part of DNS-M, dated November 9, 2006, a mitigation measure was issued, for the "development" requiring the applicant to construct a traffic signal system at this intersection. The mitigation measure currently reads: Addendum to Environmental (S., ~) Review Page 2 of4 July 23, 2012 1. In order to mitigate the significant adverse impact (14.80.030A and 14.80.0308} that the proposed development will have at the intersection of SE 192nd St/ 124th Ave SE, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted KCDOT on November 8, 2006. This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about October 2, 2006, and include all related signalization system appurtenance's necessary for the identified signal operation (including a protected/permitted phasing for the westbound left turn), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP constructed. Since the time of the two plat approvals, in 2004 and 2005, the intersection annexed into the City of Kent. The Kent Transportation Division has informed the City of Renton that mitigation, in the form of a traffic signal, is not warranted at this intersection based on the significant adverse impacts described in SEPA determination and is ultimately not desired. Appropriate mitigation would include improvements to the north side of 192"d Ave SE to the City of Kent standards, with a stop sign only. It has been determined that the environmental impacts of the proposal were adequately addressed under the analysis of significant impacts contained within the previously adopted DNS-M. However, the mitigation prescribed by KC DOES was not appropriate for addressing the impacts. Based on WAC 197-11-600(4) c, the addendum process may be used if analysis or information is added that does not substantially change the analysis of significant impacts and alternatives in the existing environmental document. The determination by the City of Kent will not change the analysis or impacts in the 1995 State Environmental Policy Act (SEPA) Review. However, this addendum will modify the single mitigation measure of the DNS-M issued on November 9, 2006 to eliminate the requirement for a traffic signal at the intersection of SE 192"d St and 124th Ave SE and will read: 1. In order to mitigate the significant adverse impact (14.80.030A and 14.80.0308} that the proposed development will have at the intersection of SE 192nd St/ 124th Ave SE, the applicant will construct improvements to the north side of192"d Ave SE to the City of Kent standards, with the inclusion of a stop sign. The City of Renton is hereby issuing a SEPA Addendum pursuant to WAC 197-11-600. This Addendum is appropriate because it contains only minor information not included in the original Determination and there no environmental impacts related to inclusion of the new information. Addendum to Environmental (S •• A) Review Page 3 of4 July 23, 2012 Location: 510 S 3rd St Lead Agency: City of Renton, Department of Community & Economic Development Review Process: Addendum to previously issued Determination of Non-Significance - Mitigated (DNS-M) Additional Information: If you would like additional information, please contact Roca le Timmons, Associate Planner, City of Renton Planning Division, Department of Community & Economic Development at {425) 430-7219. There is no comment period for this Addendum, dated July 23, 2012 issued by the City of Renton Environmental Review Committee. Addendum to Environmental (ScrA) Review Page 4 of 4 July 23, 2012 ENVIRONMENTAL REVIEW COMMITTEE SIGNATURES: r ---f c/J Gregg Zimmerman, Administrator Public Works Department Terry Higashiyama, Administrator Community Services Department Mark Peterson, Administrator Fire & Emergency Services Department C.E. "Chip" Vincent, Administrator/Planning Director Department of Community & Economic Development Date Date 7 2'/.12- Date William Popp Associates Transportation Engineers/Planners (425) 401-1030 FAX (425) 401-2125 e-mail: info@wmpoppassoc.com TRAFFIC IMPACT ANAL IS for t New Single Family Resident· l Development Prepared by: William Popp Associates 14-400 Building, Suite 206 14400 Bel-Red Rd Bellevue, WA 98007 May 27, 2004 r-.. C D.D.E.S Traffic Impact Analysis (5/27/04) Soos Creek Plat TABLE OF CONTENTS INTRODUCTION .................................................................................................................................. 1 L PROJECT DESCRIPTION ............................................................................................................ 1 IL EXISTING CONDITIONS .............................................................................................................. 1 A. TRANSPORTATION FACILITY INVENTORY ........................... . B. PEDESTRIAN SERVICES ................................. . C D. E. F. EXISTING TRAFFIC VOLUMES ...................... . SIGIIT DISTANCE (SSD AND ESD) .............. . ACCIDENTS ................................................. . KING COlJNTY CAPITAL IMPROVEMENT PROGRAM ............... . . .......... I . .. 2 .. 2 . ... 2 . .. 4 . ... 4 III. ANALYSIS ...................................................................................................................................... 4 A. BACKGROUND TRAFFIC GROWTH .................... . F. TRIP GENERATION ......................................... . C. TRIP DISTRIBUTION AND TRAFFIC ASSIGNMENT. D. BACKGROUND TRAFFIC PLUS PROJECT TRAFFIC VOLUMES. E. LEVEL·OF-SERVICE (EXISTING AND FUTURE) .................... . F. QUEUING G. LEFT TURN POCKET WARRANT ANALYSIS .... ······ 4 . ................. 5 .................. 5 .. 6 .. 7 . .......... 9 . .......... 10 IV. CONCLUSIONS ....................................................................................................................... 11 V. MITIGATION RECOMMENDATIONS .................................................................................... 12 TECHNICAL APPENDIX William Popp Associates Page i Traffic Impact Analysis (5127/04) Soos Creek Plat INTRODUCTION The following report was prepared to address King County Traffic Engineering's request for a Traffic Impact Analysis of the proposed Soos Creek Plat new residential development located in the Soos Creek area of unincorporated King County. The traffic analysis includes, among other things, analysis of intersections impacted by project traffic that meet certain criteria. That criteria is specified in King County Ordinance 11617, Section 60 Intersection Standards", which requires analysis of all intersections ( including project driveways) impacted by no less than 20 percent of the project peak hour traffic and no less than 30 peak hour project generated trips during that same hour. Based on project traffic estimates contained herein, the project is only required to conduct an analysis of off-site conditions at the SE l 92"d St/124th Ave SE intersection only I. PROJECT DESCRIPTION The proposed development is located on the west side of the extension of !24th Ave NE approximately 300 feet north of SE l 92"d Street. A vicinity map is presented in Figure I. The proposed development will include a total of33 single family units. The total area of the site is approximately 6. 9 acres. The site is currently served by a gravel road that also serves three existing single family homes, one of which is occupied, one is currently vacant but posted for rent, and one appears to be not habitable. The site is assumed to be completed and occupied by 2006. The proposed site plan is presented in Figure 2. II. EXISTING CONDITIONS A. Transportation Facility Inventory The site is currently served by a private gravel road from SE l 92"d St which is the north extension of 124th Ave SE. The road will be improved per the King County Road Standards (Section 2.03) to public urban residential Sub-Access Street standards. This standard requires a pavement width of 24 feet plus curb and 5-foot sidewalk on one side. SE l 92"d St is functionally classified as a Principal Arterial traversing east-west near the south side of the site. This roadway provides connection between SR 515 and 140th Ave SE. The cross section includes two I I-foot lanes, a 7-foot pedestrian asphalt path on the north side (channelized with rumble bars and fog line), a 6 to 8-foot paved shoulder on the south side (west of 124th Ave SE) and a 6-foot asphalt sidewalk (east of 124th Ave SE). The roadway is channelized with a double yellow centerline with occasional skip stripe William Popp Associates Page 1 Traffic Impact Analysis (5127/04) Soos Creek Plat delineation for acceptable passing zones, and fog lines. The posted speed limit is 40 mph, however east of 124th Ave SE the speed limit is reduced to 20 mph in the vicinity of the Junior High School during times when "Children are Present". Heading west from 124th Ave SE to approximately 121 '' Pl SE, the roadway slopes upward at an approximate rate of 11 %. Heading east from 124th Ave SE, the roadway slopes downward at an approximate rate of 8% that quickly levels out some 400 feet east near Meeker Junior High Schoo I. 124th Ave SE is functionally classified as a Collector Arterial traversing north-south south of SE l 92"d St. This roadway provides connection between SE l 92"d St and SE 208th St. The cross section includes two I I-foot lanes, a 6 to 8-foot shoulder on the west side, a 3 to 4-foot paved shoulder on east side, and channelized with a double yellow centerline and fog lines. The posted speed limit is 35 mph. The improved roadway extension of 124th Ave SE north of SE l 92"d St will be classified as an urban sub-access street. B. Pedestrian Services The available pedestrian facilities in the immediate vicinity of the site consist of a large paved shoulder approximately 7 feet wide on the north side of SE l 92"d Street that is channelized with rumble bars and fog line delineation. There is a short sidewalk section on the south side of SE 192"d St between 124th Ave SE and the school. There is also a pedestrian signal and crosswalk just to the east of 124th Ave SE (where the sidewalk ends). C. Existing Traffic Volumes A weekday AM and PM peak period count was conducted at the SE 192"d St/124th Ave SE intersection Tuesday December I 0, 2002. The counts were adjusted to mid-2004 utilizing a growth rate of 3% per year for I. 5 years to reflect current conditions. A summary of the existing 2004 turning movements are presented in Figure 3 and in the Technical Appendix D. Sight Distance (SSD and ESD) A sight distance analysis for both the stopping sight distance (SSD) and the entering sight distance (ESD) at the SE 192nd St/124th Ave SE intersection was evaluated. The ESD terminology was taken from the King County Road Standards. The SSD is the distance needed for a vehicle traveling at design speed on the major road to stop before reaching a stationary 6" high object in its' path. This criteria of course applies continuously along the roadway and the measured SSD generally indicates the design speed of the roadway. The minimum required stopping sight distances, obtained from Table 2.1 of the 1993 King County Road Standards (KCRS), are shown for various speed conditions in Table 1 below. William Popp Associates Page 2 Traffic Impact Analysis (5127/04) Soos Creek Plat The other sight distance considered is Entering Sight Distance (ESD). ESD as defined by KCRS deals with the ability of side street entering and mainline left-turning motorists to see oncoming vehicles with sufficient time to make entering or crossing maneuvers without significantly impeding the speed of the mainline traffic or creating hazardous conflict conditions. Entering sight distance thresholds are highest for the condition that allows a vehicle to enter the major street and attain 85 percent of the design speed before being overtaken by an approaching vehicle. As a result, the entering sight distance for this condition relates more to driver comfort rather than safety. The minimum acceptable values for entering sight distance per the County standards are also shown in Table 1. These values represent a compromise between the crossing and entering conditions described above. Table I Sight Distance Requirements at SE 192•• St/124 .. Ave SE Design Sight Distance (ft) Intersection Speed' Grade b Required' Observed• Stopping Sight Distance (SSD) ' approach from west 50mph -11% 635' 800' approach from east 50mph +8% 415' 1,900' Entering Sight Distance (ESD) I b 0 d looking left 50mph n/a 685' 1,900' looking right 50mph n/a 685' 850' Design speed ~med at 50 mph, or+ 10 mph over posted speed of 40 mph. Grade on SE 192nd St (worst case grade used). Grade adjustments only applicable for SSD. Per Table 2.1 of the 1993 King County Ro.ad Standards. SSD values adjusted for grade~ SSD for level condition is 475'. Observed values are+/-50'. Stopping sight distance assumes an eye height of3.5' in approaching lane, and an object height of0.5' al internection. Entering sight distance assumes an eye height of3.5' set back 10 from edge of traveled way, and an object height of 4.25' in the approaching lane. For a design speed of 50 mph, the minimum stopping sight distance is 475 feet for level conditions (between -3% and +3%). When adjusted for grade, the minimum stopping sight distance is 635' approaching from the west and 415' approaching from the east. The minimum entering sight distance is 685 feet. Entering sight distance is not normally adjusted for grade since the entering vehicle will traverse the same grade as the approaching vehicle. As shown in Table 1, there is adequate stopping sight distance and entering sight distance at the SE 192"d St/12411, Ave SE intersection. William Popp Associates Page 3 Traffic Impact Analysis (5/27/04) Soos Creek Plat E. A ccid en ts The three year accident history at the SE 192"d St/124th Ave SE intersection for the period of January I, 2000 through December 31, 2002 was provided by King County. A summary of the accident history at this intersection is provided in Table 2. Intersection I' SE 192nd SVI 24 Ave SE ' Table 2 Accident History 2000 Year 2001 4 2002 6 Total 11 As shown in Table 2, there were 11 accidents at this intersection between 2000 and 2002 inclusive. All of the eleven accidents were injury related. Seven of those intersections were right-angle type accidents, and 4 were rear-end accidents. The accident rate over the course of the three year period was 0.76 accidents per million entering vehicles (acc/mev), however, the accident rate in 2002 was 1.25 acc/mev. Any location where the accident rates exceeds 1. 0 acc/mev is generally considered for further review. According to the County, this intersection is currently a High Accident Location and meets traffic signalization warrants. F. King County Capital Improvement Program The County's Capital Improvement Program (CIP) includes improvement of SE 192"d Street between Benson Road and 140th Ave SE; Project Number 401595. Plans include widening to 3 lanes plus pedestrian improvements and intersection improvements, to be constructed in phases. Recently however, and due to safety concerns, the intersection of SE 192"d St and 124th Ave SE was proposed as a separate project from 401595. The project number for this project is now 401004 and includes construction of a 100-foot westbound left-tum lane, pedestrian walkway along north side of SE l 92"d Street from intersection to Meeker Junior High School, new steel pole traffic signal, pedestrian improvements around intersection radii, and possibly removal of the existing pedestrian signal at Meeker Junior High School. The County has indicated that this project is proposed as a short term small budget project and will likely be constructed within the next few years. Ill. ANALYSIS A. Background Traffic Growth For background traffic growth rate assumptions, suggested using a rate of 3% per year to reflect all pipeline related traffic William Popp Associates Page 4 Traffic Impact Analysis (5127/04) Soos Creek Plat Typically, background traffic volumes are estimated by factoring the existing traffic volumes by the historical growth in traffic to the project's horizon year and adding in known pipeline development proposals. Traffic volumes at this intersection based on King County historical data (1993 through 2003) indicate the volume at this intersection is increasing at an approximate rate of 1.4% per year with annual fluctuations ranging between 0.9% and 2.8%. A chart depicting this growth is shown in the Technical Appendix. King County Department of Transportation suggested using a rate of 3. 0 percent annually. Thus, for the purpose of this analysis, a factor of3.0 percent per year was applied to existing PM peak hour counts to achieve 2006 background volumes. AM and PM peak hour 2006 volumes with project (ie., future background traffic forecast) are shown in Figure 3. F. Trip Generation Trip generation for the proposed project was calculated using trip generation rates obtained from the Seventh Edition of the ITE Trip Generation Report, 2003. For this site, trip generation rates are associated with Land Use Code 210, Single Family Dwelling Units, were used. The results of the trip generation analysis are presented in Table 3. Table 3 Project Vehicular Trip Generation !TE Code 210" Land Use Size 33 lots Rate Vol LUC 210 -Single Family Dwelling Unit AWDT 9.57 316 AM Peak Total In Out 0.750 0.250 0.750 25 6 19 PM Peak Total In Out 1.010 0.640 0.360 33 21 12 As shown in Table 3, the proposed project is estimated per ITE to generate a total of 316 average weekday daily trips, 25 AM, and 33 PM peak hour trips. C. Trip Distribution and Traffic Assignment Trip distribution patterns used to determine the PM peak hour the project traffic assignment were nominally based on traffic counts on SE 92"d St and 1241h Ave SE as well as traffic engineering judgment. The estimated distribution percentages and project trips are shown in Table 4. William Popp Associates Page 5 Traffic Impact Analysis (5127/04) Soos Creek Plat Table 4 Trip Distribution Summary (AM and PM Peak Hour) Distribution Project Trips (AM PK) Project Trips (PM PK) Roadway Percentage In Out In Out SE 192nd St (west) 60% 4 11 13 7 SE I 92 00 St (east) 30% 6 6 4 !24th Ave SE (south) 10% 2 2 I Total 100% 6 19 21 12 As shown in Table 4, the majority (60%) of the project trips will be to/from the west on SE l 92"d St. The project's AM and PM peak hour traffic assignment to the surrounding roadway network is shown in Figure 4. Based on this table and Figure 4, no other intersection other than the SE 192°d St/124th Ave SE intersection is subject to analysis within this traffic study as the 30 trip threshold disseminates below 30 trips past this intersection. D. Background Traffic plus Project Traffic Volumes Year 2006 PM peak hour with-project traffic volumes were developed by adding project trips to the year 2006 background traffic volumes. Table 5 shows the impact of project traffic as a percentage at the SE 192"d St/124th Ave SE intersection. Table 5 2004 and 2006 Peak Hour Traffic Volumes• 2006 2004 without Project Intersection Existing Project~ Vehc AM PEAK HOUR 1,401 1,486 25 PM PEAK HOUR 1,380 1,464 33 Total Mi or PM peak hour vehicles entering the SE 192nd St/124m Ave SE intersection. Background growth reflect a growth rate of3.0% per year. Vehicle trips estimated from proposed site use. Project impact~ percent of total entering traffic. 2006 will, Project Volume Impact(%) d l,l 11 1.7% 1,497 2.2% As shown in Table 5, the impact of project traffic at the SE 19200 St/124"' Ave SE intersection is 1.7% of total entering traffic during the AM peak hour and 2.2% during the PM peak hour. The new trips generated by the proposed project at this intersection is estimated to be 25 PM peak hour trips during the AM peak hour, and 33 during the PM peak hour. Year 2006 PM peak hour with project volumes are presented in Figure 3. William Popp Associates Page 6 Traffic Impact Analysis (5/27/04) Soos Creek Plat E. Level-of-Service (Existing and Future) Level-of-service (LOS) is a term defined by transportation and traffic engineers as a qualitative and quantitative measure of operational conditions within a traffic stream and the perception of these conditions by motorists and/or passengers. There are several quantitative indices utilized depending on the type of intersection control present. There are six levels-of-service that are given letter designations from "A" to "F", with "A" being the best, or minimum delay conditions, and "F" being the worst, with maximum delay or jammed conditions. LOS "C" or "D" is generally considered acceptable for planning and design purposes, while LOS "E" represents operating conditions at or near capacity with freedom to maneuver being extremely difficult. Level-of-service for the existing condition, as well as future conditions, were calculated using the techniques presented in the 2000 Highway Capacity Manual (HCM). The supporting Highway Capacity Software utilized for all calculations is version 4.1 c. Level- of-service criteria and defmitions for signalized and non-signalized intersections are presented in Table 4. Table 6 Intersection Level-of-Senice Criteria Level of Service A B C D E F 1 Delay; seconds per vehicle Definition Little or no delay Short traffic delays Average traffic delays Long traffic delays Very long traffic delays Extreme delay Stopped Delay Per VehicJel signalized non-signalized Less than 10.0 sec 10.J to20sec 20. 1 to 35 sec 35. I to 55 sec 55.1 to 80 sec Greater than 80 sec Less than 10.0 sec 10.1 to 15 sec 15. I to 25 sec 25. I to 35 sec 35. 1 to 50 sec Greater than 50 sec The existing (year 2004) and the future (year 2006) weekday AM and PM peak hour level of service results at the analysis intersection is presented in Table 7. Note that for signalized intersections, the delay presented represents the overall operation of the intersection, whereas the delay presented for an unsignalized intersection summary represents the delay for the stopped approach or movement. William Popp Associates Page 7 Traffic Impact Analysis (5/27104) Soos Creek Plat Table 7 Level of Service -2006 PM Peak Hour with Project • SE 192nd St/124th Ave SE< Peak Hour Peak. Hour Time Frame LOS Delay Comments AM PEAK HOUR 2004 Existing B (13.9) northbound approach; shared. F (71.7) southbound approach; shared (private) A (<10.0) eastbound left tum A (<10.0) westbound left tum. 2006 w/o Project C (15.5) northbound approach; shared. F (88.7) southbound approach; shared (private) A (<10.0) eastbound left turn. A (<10.0) westbound left turn. 2006 w/Project C (16.6) northbound approach; shared. F (54.9) southbound approach; shared (public) A (<10.0) eastbound left tum. A (<10.0) westbound left tum. B (18.7) with signal and EBIWB /.efl turn lanes (delay represents overall interse.cti.on delay) PM PEAK HOUR 2004 Existing D (28.5) northbound approach; shared. A (9.5) southbound approach; shared (private) ~~ .. -._ A (<10.0) eastbound left tum. B (10.2) westbound left turn. 2006 w/o Project E (35.8) northbound approach; shared. A (9.6) southbound approach; shared (private) A (<10.0) eastbound left turn. B (10.6) westbound left tum. 2006 w/Project E (39.5) northbound approach; shared. D (35.0) southbound approach; shared (public) A (<10.0) eastbound left tum. B (10.6) westbound left turn. C (22.4) wiih signal and EBIWB left turn I.JJnes(de/ay represents overall intersection dday) Project; 33 SFDU's. During the AM peak hour, the critical side-street approach is the southbound approach (from a private road without project) and is estimated to operate at LOS F during the existing year and the horizon year with or without the project. For the existing condition and the future without project condition, there is only one trip exiting from the private drive during the hour (and turns left). The project will add 19 trips to the this approach with 60% turning right. Thus since the right turn movement is general a low delay movement, the overall approach delay for this approach (the southbound approach) improves with the project. The average delay improves from approximately 34 seconds per vehicle with the project traffic; from 88. 7 sec/veh to 54. 9 sec/veh. The eastbound and westbound left turns are estimated to operate at LOS A. With installation of a signal, as part ofCIP 401004, the overall intersection LOS is estimated to be LOS C with an William Popp Associates Page8 Traffic Impact Analysis (5/27104) Soos Creek Plat average delay of 18. 7 seconds per vehicle. The worst approach is estimated to be the northbound approach with a LOS D and an average delay of 39.6 seconds per vehicle. It is important to note that the geometric and signal operation assumptions including the following: • Two-lane approaches on the east and west legs; left-turn pocket and through-with- shared-right-turn for both approaches. • Single lane approaches on the north and south legs. • A four legged intersection with signal mast arms on all legs. • A three-phase fully-actuated signal with protected/permissive phasing for the eastbound and westbound left turn lanes. During the PM peak hour, the critical side-street approach is the northbound approach ( from 124 th Ave SE) and is estimated to operate at LOS D during the existing year and LOS E during the horizon year with or without the project. The southbound approach (private road without project) is estimated to operate at LOS A for the existing condition and the future without project condition. The LOS is estimated to worsen to LOS D with project, and the average delay is estimated to be 35 seconds per vehicle. The project will add 12 trips to the this approach with 60% turning right. The eastbound left turn is estimated to operate at LOS B and the westbound left turn is estimated to operate at LOS A. With installation of a signaL as part of CIP 401004, the overall intersection LOS is estimated to be LOS C with an average delay of 22.2 seconds per vehicle. The worst approach is estimated to be the northbound approach with a LOS D and an average delay of 45.6 seconds per vehicle. It is important to note that the geometric and signal operation assumptions are as noted above in the AM level of service discussion Refer to the Technical Appendix for the volume breakdown and level of service calculation sheets. F. Queuing An analysis of queuing for selected movements at the SE 192"• St/124th Ave SE intersection was conducted. Queuing was reported for the 95th percentile condition. The 95th percentile queue implies that 95 percent of the time the queue will be equal to or less than calculated, and 5 percent of the time the queue will exceed the calculated queue. The findings are discussed below. At the SE 192"• St/I 24th Ave SE intersection, vehicle queuing was calculated for only the eastbound and westbound approaches. This would include the eastbound left turn lane, the eastbound through/right lane, the westbound left turn lane, and the westbound through/right turn lane. The calculated queue lengths for the 2006 AM and PM peak hours with project are presented in Table 8. William Popp Associates Page 9 Traffic Impact Analysis (5/27/04) Table 8 Peak Hour Queuing Estimates ' Intersection/ Approach AM Peak Hour Eastbound Left Tum Lane Eastbound Through/Right Tum Lane Westbound Left Tum Lane Westbound Through/Right Tum Lane PM Peak Hour Eastbound Left Tum Lane Eastbound Through/Right Tum Lane Westbound Left Tum Lane Westbound Through/Right Tum Lane 2006 Peak Hour with Project Traffic 95th Percentile Queue Vehicles h Leugth (ft)' 0.1 7.1 7.2 36.1 0.3 44.2 4.3 7.5 3 178 180 903 8 1,105 108 188 ' Queuing summaries at the SE 19200 St/124111 Ave SE intersection. Queue results obtained from the HCS outputs. Based on 25 feet per vehicle. Soos Creek Plat As shown in Table 8, for the 2006 peak hour with project traffic, the maximum 95th percentile queue for the eastbound left turn movement occurs during the PM peak hour and is estimated to be only 0.3 cars per cycle which equates to 8 feet. Of course, this is a calculated result. Adjusting for real world conditions, the maximum 95th percentile queue will be I vehicle or 25 feet for the eastbound left turn. The eastbound through queue is estimated to be I, I 00 feet during the PM peak hour. It is important to note that the area north of SE I92"d St in the 124th Ave SE corridor is not anticipated to grow in the future, thus the eastbound left turn volume and queue estimates should be adequate for design purposes. G. Left Turn Pocket Warrant Analysis The analysis considered the need for an eastbound left turn lane on SE l 92"d St during both the AM and PM peak hour periods. This analysis was conducted based on left turn storage guidelines from the WSDOT Design Manual, Figure 910-9a. The results of the analysis are presented in Table 9. William Popp Associates Page JO Traffic Impact Analysis (5/27/04) Time AM Peak.Hour PM Peak.Hour Total DHV 1 1,273 1,296 Table 9 Left Turn Lane Warrant Analysis Eastbound Left Tums During Peak Hour h Veh % Lefts 4 13 0.3% 1.0% WSDOTCurve Warrant Threshold< Veh % Lefts 17 17 1.35% 1.29% Soos Creek Plat Worrant Met? No No 1 Total DHV: Total volume from both approach directions on SE 192nd St (2006 peak hour volume with project traffic). 2 Total future vehicles turning left into the site during the peak hour. 3 Warrant volumes based on WSDOT Design Manual Figure 910-9a for posted 40 mph speed. Warrant volumes shoVffi are minimums. As shown in Table 9, an eastbound· left turn storage lane on SE 192nd St is not needed per the WSDOT Left-Turn Storage Guidelines. Summary calculation sheets are attached. However, due to the fact that a westbound left turn lane is being constructed on the opposite side of the intersection, it is good design practice that an opposing eastbound left turn lane be constructed as part of the same project. IV. Conclusions The preceding analysis was prepared to address issues identified by King County traffic engineering staff and to ensure adequate traffic operations are achieved for both the new site residents and the surrounding traffic. Based on the findings contained herein, the project impacts only warranted a traffic analysis of conditions at the SE 192"' St/124th Ave SE intersection. The following is a summary of findings of this study: • The project consists of 33 new single family dwelling units and is estimated to generate 316 average weekday daily trips, 25 AM peak hour trips and 33 PM peak hour trips. • King County is proposing as part ofCIP 401004 to construct a westbound left turn lane and signal at the SE 192°d St/124th Ave SE intersection as well as new pedestrian amenities. This intersection is considered a High Accident Location, and the intersection meets accident warrants for installation of a signal. • Since the current configuration of the SE l 92"d St/124th Ave SE intersection includes 4 legs, it is assumed a new signal would include signal control for the north leg, even if it remains a private drive. • There is adequate entering and stopping sight distance for the improved north leg at the SE 192"d St/124th Ave SE intersection. However, this may be irrelevant with the construction of a signal at this intersection. • During the AM peak hour, the southbound approach ( critical approach) level of service is estimated to be LOS F with or without the project. The project traffic in fact actually improves the average approach delay by approximately 34 seconds per vehicle. This is due to the fact the approach is a weighted result of lefts, throughs, and William Popp Associates Page 11 Trq/jic Impact Analysis (5/27104) Soos Creek Plat rights, and 60% of the project traffic is right turn. It should be pointed out that there are only 20 vehicles on the southbound approach during the AM peak hour. • During the PM peak hour, the northbound approach is critical. The level of service is LOSE with an average delay of39.5 seconds per vehicle for the future with project scenario. The southbound approach is LOS D and there are only 14 vehicles. • The level of service for the eastbound and westbound left turns is LOS A or B for the future with project scenario. • With installation of a signal and left tum pockets on the eastbound and westbound approaches, the level of service is C for both the AM and PM peak hours. The northbound approach is the worst approach; LOS D. • For the future with project scenario, the eastbound left tum 95th percentile queue is estimated to be only 0. 3 vehicles per cycle which occurs during the PM peak hour. Thus, the adjusted maximum queue is estimated to be I vehicle or 25 feet. • The westbound left tum 95th percentile queue is estimated to be 180 feet in the AM peak hour and I 08 feet in the PM peak hour. It is assumed that the current County CIP design includes a I 00 foot westbound left turn storage lane and a 50 foot transition zone. Assuming that storage can be utilized in the transition, the turn lane may be 30 feet short of what is required. This is all based on 2006 traffic forecasts. A 125 foot storage lane for the westbound left turn may be more appropriate. • An eastbound left tum lane is not warranted per WSDOT guidelines. However, it would be better design practice to include an opposing turn lane when the westbound left tum lane is constructed. The recommended minimum length of an eastbound left turn storage lane should be 50 feet. Transition tapers back to existing would begin past the 50 foot zone. Assuming this tum lane ends in alignment with the curb radii endpoints on either side, the added pavement area is estimated to be approximately 17% of the westside widening, and 7% of the total widening (not including shoulders). Finally, the project has applied for transportation concurrency and received a certificate of concurrency for 43 single family lots. V. Mitigation Recommendations The mitigation recommendations for the Soos Creek Plat residential project are as follows: • King County's Mitigation Payment System (MPS) is utilized to provide funding for transportation improvements. The county is divided into 456 zones for which a residential fee has been pre-calculated for each zone. This project is located in MPS Zone #342. The residential fee within this zone is $3,765 per single-family unit per the (latest) October 28, 2002 King County Mitigation Payment System Residential Fee Schedule (obtained from www.metrokc.gov). Assuming there are 33 units, it is estimated that the MPS fee would be $124,245. • The project will be required to improve (per the King County Road Standards, Section 2. 03) the private road between SE I 92"d St to the plat to public urban residential Sub- William Popp Associates Page 12 Trqffic Impact Analysis (5127/04) Soos Creek Plat Access Street standards. This standard requires a pavement width of 24 feet plus curb and 5-foot sidewalk on one side. • An eastbound left turn lane does not meet warrants for required installation. However, due to the fact the County CIP will be constructing a westbound left turn lane it is recommended that an eastbound left turn lane be considered for better design and safer operations. Preliminary sketches of a short 50-foot eastbound left turn lane indicate that approximately 1,500 sf of additional pavement would be required (versus no left turn lane) on the west leg. This additional pavement would represents approximately 7% of the total paved area when considering both the east and west legs. • The Soos Creek plat project will certainly benefit from the installation of a signal at the SE I 92"d St/124th Ave SE intersection. However, this signal will be constructed with or without the project and it is assumed it will be designed to accommodate all four legs. If the project were required to contribute towards the signalization improvement costs, it is recommended that the fee be based on the project's impact at the intersection. A fair-share percentage impact methodology results in a project impact of 2.2% of the total traffic entering this intersection. This is based on traffic during the PM peak hour. William Popp Associates Page 13 William Popp Associates Transportation Engineers/Planners (425) 401-1030 FAX (425) 401-2125 e-mail: info@wmpoppassoc.com TECHNICAL APPENDIX FOR SOOS CREEK PLAT May 27, 2004 CONTENTS: v" King County Mitigation P3.1.ment table v" Traffic Growth at SE 192" St/124th Ave SE v" AM and PM Peak Hour Turning Movement Volumes -2004 Peak Hour ( existing) ,,. 2006 Peak Hour without project ,,. 2006 Peak Hour with project v" HCS Level of Service Calculations -2004 AM and PM Peak Hour ( existing) -2006 AM and PM Peak Hour without project -2006 AM and PM Peak Hour with project -2006 Signalized Scenario (AM and PM) v" Left Turn Storage Guidelines Analyses 14-400 Building• Suite 206 • 14400 Bel-Red Road• Bellevue, WA 98007 • 1 ~"',,,;,;.~ #;,.: ii Tay Io r Engineering Ll'tL~~~llconsultants TEC Project No. 294-JMA PRELIMINARY TECHNICAL INFORMATION REPORT for Fleuve des Voiles and Cogger Plats King County Tax Parcel Nos. 619900-0220, -0240, 0241, & -0260 Subdivision File # A03P0286 LSUD File # L04P0002 Site Address: 12216 SE 192nd Street Renton, Washington Exhibit No. ~b'.c..._ ___ _ Item No. lo,tP<:)~~2 Received /2. -12 -c:>1q King County Hearing Exarni11cr Prepared by: Lorna M. Taylor, Date: September 15, Revised: March 29, ~~~==;:".~~~~~:;:=;:;:~~~~~~=::'.'.~~~~~~~-----/ 205 Front St. S • P.O. Box 1787 • Issaquah. WA 98027-0073 • tel. (425) 391-1415 • fax (425) 391-1551 • www.teccivil.com MAIN FILE COPY LtJt./ ,hoe;:) Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Section 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Appendices Appendix A: Appendix B: Appendix B-1: Appendix C: Appendix D: Appendix E: TABLE OF CONTENTS Description Project Overview ........................................ .. Conditions and Requirements Summary .......... . Off-Site Analysis ......................................... . Flow Control and Water Quality Facility Analysis and Design ................................................... . Conveyance System Analysis and Design ....... . Special Reports and Studies ......................... . Other Permits ............................................. . ESC Analysis and Design ............................. . Bond Quantities, Facility Summaries, and Declaration of Covenant.. ............................ .. Operations and Maintenance Manual. ............ .. Figures Page Number 1 1 3 4 5 5 6 6 6 6 1. Technical Information Report (TIR) Worksheet 2. Site Location 3. Drainage Basins, Subbasins, & Site Characteristics 4. SGS Soils Map Off-site Analysis Drainage System Table and Map Drainage Complaint Analysis (previously submitted) Analysis and Design Maintenance Requirements for Privately Maintained Drainage Facilities -not included in this preliminary report Bond Quantities Worksheet -not included in this preliminary report Retention/Detention Facility Summary Sheet and Sketch Declaration of Covenant -not included in this preliminary report TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat SECTION 1 PROJECT OVERVIEW This Technical Information Report is submitted to the King County DOES in accordance with the King County Surface Water Design Manual (KCSWDM). A Level 1 Technical Design and Information Report for Preliminary Plat Review, dated January 26, 2004, was previously submitted for the Fleuve des Voiles site; and portions of that previous report are referenced herein; however, the proposed plat has been significantly changed and this TIR addresses the currently proposed plat layout. The Fleuve des Voiles plat was submitted as the "Soos Creek Plat" on September 15, 2004 and is subject to full compliance with the 1998 KDSWDM. That plat layout has been modified and the drainage facilities re-sized to accommodate the revised layout and the additional adjacent Cogger Short Plat which is subject to full compliance with the 2005 KDSWDM. This TIR addresses the development of both plat areas and the requirements of each version of the manual or approved adjustments. A Surface Water Design Manual Requirements/Standards Adjustment Request has been prepared addressing three standard adjustments to Core Requirement #1 and #3. The 6. 7 4-acre Fleuve des Voiles project site and 0.93-acre Cogger project site comprise 4 existing lots and are located at 12216 SE 192"d Street in Renton, Washington. The Fleuve des Voiles project proposes to subdivide three lots into 39 residential lots, and the Cogger project proposes to subdivide the fourth lot into 8 lots, providing the required infrastructure, including access roads, water and sanitary sewer service, storm runoff collection, conveyance, detention and treatment, and erosion control for each plat during construction. Appendix A contains a Technical Information Report (TIR) worksheet for the projects (Figure 1), as well as a Site Location Map (Figure 2), Drainage Basins, Subbasins, and Site Characteristics figures (Figure 3a -3e), and a Soils map (Figure 4). More detailed site information is included in Appendix C with the existing and developed site runoff model data. SECTION 2 CONDITIONS AND REQUIREMENTS SUMMARY The following summary describes how this new project will meet the eight "Core Requirements" and the "Special Requirements" that apply: Core Requirements 1. Discharge at the Natural Location: The sites currently slope, steeply in places, to the east and the Soos Creek wetlands. The southernmost portions of the Cogger Plat property drain east along the north edge of SE 192"ct Street in an ill-defined swale. There are no well-defined drainage paths on the site, and runoff occurs in a dispersed manner. The project proposes to detain all runoff from the developed portions of the property and to bypass and disperse off-site flows, which should adequately mimic existing conditions. However, this will require a Standard adjustment to Core Requirement #1: It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable is preferable because strict compliance with Core Requirement #1 would result in discharge to the neighboring backyards creating an unacceptable situation for the adjacent property owners. TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat 2. Off-Site Analysis: A Level 1 offsite analysis was conducted for these preliminary plats as described in Section 3. 3. Flow Control: Runoff from the sites will be controlled to meet the requirements of the KCSWDM in a combination detention and treatment pond. Discharges from the facility will be to a dispersion/energy dissipation facility. Two standard adjustments to Core Requirement #3 are required for this proposal: 1) The project proposes to use Level 1 detention criteria for the entire site. The project site contains both Level 2 and Level 1 detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level 1 detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. Appendix C contains the KCRTS input and output. 2) These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stormwater is a logical extension of this concept. 4. Conveyance System: The conveyance system will be sized to convey the 25-year storm without flooding and the performance during the predicted 100-year storm will be evaluated to ensure that significant flooding will not occur. (not included in this preliminary report) 5. Erosion and Sedimentation Control: Runoff from the grading and trenching construction areas will be contained by a temporary construction entrance, silt fencing and sediment traps/ponds in accordance with the KCSWDM during construction. The ESC facilities will only be removed once all exposed site surfaces have been stabilized. Other temporary erosion and sedimentation control measures will be installed as needed. (not included in this preliminary report) 6. Maintenance and Operations: The combination detention and treatment pond and cartridge filter treatment catch basins should be maintained as described in Appendix D, which includes the KCSWM Maintenance Requirements for Privately Maintained Drainage Facilities. (not included in this preliminary report) 7. Financial Guarantees and Liability: The bond quantities worksheet is included in Appendix E. (not included in this preliminary report) 8. Water Quality: Treatment of runoff from the 124'" Avenue SE roadway will be provided in two cartridge filter treatment catch basins and the runoff from the remainder of the site will treated in the dead storage portions of the combination detention and treatment ponds, both of which were sized according to the KCSWDM for Basic Water Quality Treatment. Appendix C contains the calculations used to size the treatment facilities. Special Requirements 1. Other Adopted Area-Specific Requirements: Shared Facility Drainage Plans (SFDPs): These two projects propose to provide detention and treatment in a common facility located in the Fleuve des Voiles plat. The facility sizing took into account the differences in drainage manual requirements for the 2 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat two projects. The only impact this had on the design is that the Cogger Short Plat area was modeled as fully forested for it's existing condition. The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The detention facility is located at the base of the hill and will discharge via dispersion to a Level 1 Flow Control area. Appendix A contains King County mapping to support this. 2. Floodplain!Floodway Delineation: Not Applicable. 3. Flood Protection Facilities: Not Applicable. 4. Source Controls: Not Applicable. 5. Oil Control: Not Applicable. SECTION 3 OFF-SITE ANALYSIS The downstream drainage path was documented and the County's Drainage Complaints File was again solicited to make sure no additional pertinent drainage complaints have been lodged since the original Drainage Complaint Analysis, dated March 20, 2004, which was produced for the project by Jacques Consulting. Task 1. Study Area Definition and Maps The figures in Appendix B show the extent of the study area and the local topography. The Site Plan drawing shows more detailed topographic information on the project site. Task 2. Resource Review Agency mapping was reviewed and TEC contacted King County regarding documented drainage complaints in the vicinity. The SCS soils map identifies site soils in the proposed development area as Alderwood Gravelly Sandy Loam, O -6% slopes and 15 -30% slopes. Task 3. Field Inspection In accordance with the KCSWDM, the existing site and off-site drainage systems were inspected on June 15, 2004. Task 4. Drainage System Descriptions and Problem Descriptions There is only one report of a drainage problem in the immediate vicinity of the project. This complaint involved a plugged driveway culvert across 124th Avenue SE at SE 192"d, and the problem has been corrected according to the previously submitted Drainage Complaint Analysis by Jacques Consulting, dated March 20, 2004 (see Appendix 8-1). The County's drainage complaints file was solicited again more recently, and the results of this search are included in Appendix B. No additional pertinent drainage complaints have been logged in the interim. If the proposed drainage system were to fail, and the detention facility were to flood, the emergency overflow path for runoff would be into the adjacent Soos Creek wetlands. These wetlands feed Soos Creek, which flows south on the King County-owned property to the east of the project property. 3 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Task 5. Mitigation of Existing or Potential Problems To mitigate any water quantity impacts from the project, detention of runoff is proposed meeting Level 1 flow control requirements in accordance with the King County Surface Water Design Manual (KCSWDM) and a Standards Adjustment Request. Water quality impacts will be addressed in two Basic Water Quality treatment facilities: a combination detention and treatment pond and two cartridge filter treatment catch basins. The pond will treat runoff from the site, and the cartridge filters will treat runoff from 1241 h Avenue SE. SECTION 4 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The following subsections describe the measurements and criteria used to size the detention and treatment facilities. Existing Site Hydrology (Part A) The drainage on the existing site was analyzed for this project with KCRTS. Figures provided in the KCSWDM and KCRTS manual were used to determine project location and scale factor parameters. The figures in Appendix C show the delineation of the areas generating runoff on the site. The site soils are classified Alderwood Gravelly Sandy Loam, either O -6% or 15 - 30% slopes. Appendix C also contains the data and output from the existing site hydrologic analysis. The existing site conditions identified for this project and used in the KCRTS modeling included 6.97 acres of forest, 0.31 acres of impervious surfaces, and 0.39 acres of grass/landscaping. Developed Site Hydrology (Part B) The proposed drainage systems will route "site· runoff to a Level 1 detention pond which will route outflow to a dispersion/energy dissipation facility draining to the adjacent Soos Creek wetlands. Runoff from 1241h Avenue SE will be controlled as over-detention in the pond and will flow directly to treatment catch basins prior to dispersed discharge to Soos Creek north of SE 192"d Street. The developed site conditions identified for this project and used in the KCRTS modeling included 5.06 acres of impervious surfaces, 2.27 acres of grass/landscaping, and an additional 0.34 acres of impervious surface on 124th Avenue SE that will bypass the detention. Appendix C contains the data and output from the developed site hydrologic analysis. Performance Standards (Part C) The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The detention facility is located at the base of the hill and will discharge (via dispersion) to a Level 1 Flow Control area. Conveyance features will need to be sized to convey the 25-year developed runoff and their performance during the 100-year event should be checked to be sure that significant flooding would not occur as a result. Flow Control System (Part D) The detention pond was sized using the KCRTS routine. The following table summarizes the sizing requirements for the detention pond. 4 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Detention Pond Requirements Required storage volume Effective storage depth Top area@ 1' freeboard Bottom area Orifice #1 diameter Orifice #2 diameter Orifice #2 heiqht Pond 57,698 cf 4 fl 19,549 sf 11,288 sf 2.19" (2-3/16") 2.34" (2-5/16") 3.00 fl Descriptions of the procedures used and calculations and computer output are included in Appendix C. Water Quality (Part E) Runoff from the site will be treated in the dead storage portion of the combination detention and treatment facility, which was sized for Basic Water Quality Control. Runoff from 1241 h Avenue SE will be treated in two cartridge filter treatment catch basins. The following table summarizes the sizing requirements for the treatment pond. Treatment Facilitv Site Pond 1241h Ave. SE Filters Required wetpool volume (Vb) 26,217 cf Wetpool depth 4 fl Top area 15,995 sf Q .. _ 0.05 cfs Descriptions of the procedures used and calculations and computer output are included in Appendix C. SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 6 SPECIAL REPORTS AND STUDIES Several studies and reports were conducted and produced for this project and are available under separate cover as listed below. 1. Wetland Evaluation and Delineation Report prepared by H & S Consulting, dated May 13, 2004. 2. Traffic Impact Analysis prepared by William Popp Associates, "Draft" dated May 27, 2004. 3. Geotech Report prepared by GeoTrends, Inc., dated March 20, 2004. 4. Conceptual Buffer Mitigation Plan prepared by AC Roth Environmental Services, dated March 20, 2006. 5 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat SECTION 7 OTHER PERMITS No other permits beyond those required by King County are anticipated to be required for this project. SECTION 8 ESC ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantities: Not included in this preliminary report. Facility Summaries: The County's Facilities Summary Sheet is included in Appendix E. Declaration of Covenant: Not included in this preliminary report. SECTION 10 OPERATIONS AND MAINTENANCE MANUAL Not included in this preliminary report. 6 TEC APPENDIX A FIGURES 1. Technical Information Report (TIR) Worksheet 2. Site Location Map 3. Drainage Basins, Subbasins, & Site Characteristics 4. SCS Soils Map King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECTOWNER AND PROJECT ENGINEER Project Owner./?. _/, C' i} cn~e[ '¥2-" . Project Engii:ieer LortJA Company_-L,,=s.-+--'-'-'"=-~--,-::,;--_ Address/Phone fa:] Subdivison f I e_u_,K J..,._; Ve; fl" 5 ~ Short Subdivision Co'h"'' D Grading D Commercial D Other ________ _ Community Drainage Basin D River D Stream __________ _ D Critical Stream Reach D Depressions/Swales D Lake __________ _ :w:'.' Steep Slopes _ _,i/Q'-'-_"l_-., ____ _ Part 2 PROJECT LOCATION AND DESCRIPTION P.[9iect Name He,, ve de.r Vo,'/es 1 u.«15e,,.. PM u.:r Location 7 Township Z3 ;J Range_~fi~f:i~--- Section ____,;?j""-''----- D DFW HPA D Shoreline Management D COE 404 D Rockery D DOE Dam Safety D Structural Vaults D FEMA Floodplain D Other D COE Wetlands D D D D D D Floodplain Wetlands Seeps/Springs High Groundwater Table Groundwater Recharge Other Figure 1 TIR Worksheet {3 pages) Part 7 SOILS . Soil Type 69/f REFERENCE Slopes o~G 0la ~ Ch. 4 -Downstream Analysis D D D D D D Additional Sheets Attached MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION 0"" Sedimentation Facilities f1" Stabilized Construction Entrance r"f Perimeter Runoff Control P, Clearing and Graing Restrictions 0 Cover Practices [I"' Construction Sequence D Other .. ·. Erosion Potential Erosive Velcoties LIMITATION/SITE CONSTRAINT MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION l=r Stabilize Exposed Surface r( Remove and Restore Temporary ESC Facilities ff Clean and Remove All Silt and Debris W Ensure Operation of Permanent Facilities c::r'Flag Limits of SAO and open space preservation areas D Other Part 10 SURFACE WATER SYSTEM D Grass Lined ,l Tank I __ J Channel D Vault 0' Pipe System D Energy Dissapator LJ Open Channel D Wetland D Dry Pond D Stream i:r'wet Pond Facility Related Site Limitations Reference Facility ·. Part 11 STRUCTURAL ANALYSIS _,,-. •, ":' ' U Cast in Place Vault Q/Retaining Wall D Rockery > 4' High g,· Structural on Steep Slope D Other D Infiltration Method of Analysis ~CIZ.[5 (ell:fl 1 LJ Depression D Flow Dispersal Compensation/Mitigati on of Eliminated Site D Waiver Storage D Regional Detention Part 12 EASEMENTS/TRACTS •· .. ·· > D Drainage Easement D Access Easement .. ·· .. ··. M' Native Growth Protection Easement D Tract D Other Part 13 $J{311JA TURE OF PR9i§>IS10NAl ENGINEER I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is accurate. MapQuest: Maps: print ~ Send To Printer Back to Map I 12216 Se 192nd St ' Renton WA ' 96058-7526 us i Notes: I ,Map Legend This map is informational only. No representation is made or warranty g lven as tt MapQuest and its suppliers assume no responsibility for any loss or< Privacy Policy & Legal Notices © 2004 MapQuest.com, Page I of I ____ ... ........_,_.-..._;_;::....._ p-·-, l!1oHarr[,!f,1h11Son . .. -~---....--~- Figure 2 Site Location Map No Scale http://www.mapguest.com/maps/print.adp?mapdata=p5kgyoo6yZLyznAhGFxE2MBWwU ... 9/10/2004 Map Output ® King County IIIIDB\'IIII P9 Solih.4'>d Pa""'s I _• County !!ound•,y Slfl!•t& P1, -('.f ,_.,,. News C1#iii44M Legettd lal<ss •nd La,go m,,,,,. Slfl!"""' Klog C!runfy OWll<!d p,ope!!ie& Pam>l< Page I of I Comments Mi¥ii4,M e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy. completeness. timeliness, or rights to the use of such information. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or lost proms resulting from the use or misuse of the information contained on this map. sale of this ma or information on this m is rohibited exce t b written ermission of Kin Coun . King County I GIS Center I News I Services I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. Figure 3a Drainage Basins, Subbasins, & Site Characteristics Scale as shown http://wwwS.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&Clie ... 9/10/2004 Map Output ®King County lm.\1!8~4M@W . -I _• Ct'JUMy 6d-.1fld.aty 'Stl'QP.1S /if t~~~,' i"/ .. ~ 1~=1 L~v.1 /V """ ?M!'OO~ F:n;,h ~t1d r.Tu-.h 'SAO St:!'6:.lt'!'l D Legend L~kir.'i. arid L~tg\<j ru.,·Mt Sb'i'!~l'fW ~ :ft.trJd"n<ay BSJ 100 ¥sarAoOOp:tir!t'I 'WLRO CJltiirin.sJ i:tgralkn:1 :l'-tazaid ~ft$: .SAO \~Hand .SAO l..'.l:!'ld?S:ki~ SAO Se~ SAOEro'*ln l.:an,:hfidiB H-.anmJ 0:a'ina_ge Ar1u1 Page I of 2 Mi44i4'M e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representE implied, as to accuracy, completeness, timeliness, or rights to the use ot be liable for any general, special, indirect, incidental, or conseque o, lost revenues or lost proms resulting from the use or misuse of the sale of this ma or information on this ma is rohibited exce t b· King County I GIS Center I News I Services I Co Figure 3b Drainage Basins, Subbasins, & Site Characteristics Scale as shown http://www5.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&ClientV ... 9/15/2004 I / I J ! ------ I _J-~----:--~---y-I I l I t,t----- I -' -___ \./ i 1 \ ; 1· I I i I i I I -~ ' ; i I i -------_L -----1 l ____ .i: ----> ... _____ _; Figure 3c Drainage Basins, Subbasins, & Site Characteristics Scale as shown ·+ ·1 ---- I I '~-------------------~~----- I 11 11 IJ I Figure 3d Drainage Basins, Subbasins, & Site Characteristics Scale as shown I I 0 w (9 r,... oll co NQ 0 0::: O.o 8>- <(I ~ ii iJr t }f 1· ~ j?•Jii}fl;i I ~ l !!ti ,:,!hi ~ '•J tr;u•t r 11 ff1 pit -i! • (1 -!It ~ @ Ht!f df itf ,1,1 o_rh ihllutlfh Figure 3e Drainage Basins, Subbasins, & Site Characteristics Scale as shown I t:1§+::,5"1E1!fc1"~ • / PROJECT S.tTE SorL " /Jgfl I/ IJji). A1 : /JLf}€Ra;ootJ t!hv&tLY Sw.H ll>MI B = o -1:, 'Z Su:i.PEJ D =Ir-Yo% .fu,,t;S Figure 4 SGS Soils Map 1" = 2,000' APPENDIX B OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE AND MAP Basin: B-C C-D D-E 98-4\inB04 Soos Creek itilllll flilii~li Sheet flow and sub surface flow Wetland/stream/ channel flow, approx. 150' wide 48" culvert Stream 0FF·SITE ANALYSIS DRAINAGE SYSTEM TABLE SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Subbasin Name: Subbasin Number: 111111111 Soos Creek grassy wetland area Soos Creek grassy wetland area Crossing 192nd Soos Creek 2% -I O' -350' 3% 1 % -I 350' -550' I None noted 2% 550' -650' I None noted 0.5% -1650' - 1% 2,650' + None noted Wet marshy area, relatively inaccessible Wet marshy area, relatively inaccessible This culvert was not visible at the time of the inspection, but according to the previous downstream analysis, has conveyed 100- year flows without floodin.., .. Creek flows in a wide wetland area. 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King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or lost profits resulting from the use or misuse of the infonnation contained on this map. n sale of this ma or information on this ma is rohibited exce t b written ermission of Kin Coun . King County I GIS Center I News I Services I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. Off-site Analysis Drainage System Map (Drainage Basin Trib. Area) Scale as shown .. , 1.33 = 5,c.s, .. , I ::Z: 'f;t30 , ,, 1' . I .,.,,. : O." I :::r, .......... -.,...., ~ hnp://www5.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&ClientV ... 9/15/2004 SEP.lL.2004 2:04PM KC (llPD N0.102 liq Cllullty Wllt8r 11111.81111 R880ll'Cta lllliliOR -11'81118U8 88m81 I PhoM# '""'4-ZS-~ 155 I , ... Cm-Saaroh Printed: 91'."2004 1:3T:24 PM CQlallt lYJJI TYIII of PrllllB• MnaofPrlllH CRIHIB Tnl'u ••r ca 1976,0110 C DRNG 13038 SE 188TH PL @BLVD LN 681lG2 1977..0072 C FLOG 12202 SE 192NDST 686F2 1977-0074 C FLOG 13210 SE 192NDST ~ILLJDRAIN WAY 686G2 1978..0080 C PONDING 19248 121ST PL SE EAST OF SENSON HWY 686F2 1978..0081 C DRNG 19248 121ST PL SE 686F2 1981-0225 C FLOG 13210 SE 192NDST DRAIN WAY FILLED 686G2 1982-0539 C FLOG 12600 SE 192NDST EAST KENT AREA eaGF2 19114-0313 R FLOG 13250 SE 192ND ST TO ROADS DIV.4 686F2 1964·0314 C FLOG 13250 SE 192ND ST SE 192NO ST1134TH AVE SE 686F2 19B5-0534 X DRNG 13250 SE 192ND ST LTR TO CCMPU>.INT 686G2 19$6-0617 C ORNG 13432 SE 167THST FLDG ON SIDEWALK 686G2 1986-0816 C FLOG 13440 SE 192ND ST AEF:SB,0832 NESPER 87-0770 686G2 1966-0816 ER FLOG 13340 SE 192NDST (REF:86-0632 NESPER) PVT PROB. 686G2 1986·1278 CL CLAIM #10373 686G2 1987..()770. C FLOG 13440 SE 192NDST cAIRWOOD SEE 86-0816 688G2 1987,1049 C TO RD COORD 04127187. 688F2 1988-0118 X DRNG 13250 SE 192ND ST see 615-1278 NESPERICL • FORSEST TRAI 686G2 1988-0238 C FLOG 18431 120THAVE SE NEW DRIVEWAY WILL IT FLOOD 688F2 1988..0238 ER PIPE 18431 120THAVE SE NEED EXTENSION OF 42" CULVERT 1586F2 1988-0305 C 6LOCKAGE 12716 SE 188TH PL EASEMENT-FAIRWOOO/WALL CONSTRUC 68BG2 1989..()003 C DRNG 18612 120THAVE SE INCREASED RUNOFF/CHANNEL 686F2 1989-0192 C DRNG 18612 120THAVE SE X PIPE NOT WORKING 68GF2 1989.0550 C EROSION 19118 130THAVE sE OLD EASEMENT CHANNEL MAINTENANCE 686G2 1989..()665 C DRNG 13308 SE 184TH PL WATER IN BASEMENTNARD DRAIN CLOG 686G2 1990.0056 C FLOG 12700 SE 187TH PL UTILITY EASEMT CLOGGED 9().()259 68602 1990-0259 C FLOG 12700 SE 187TH PL F'I/T DITCH OVERFLOW 68602 1990·1106 C DRNG 13517 SE 189TH PL CULVERT SLEW TRASH RACK/ CEDAR ES 686G2 1990-1106 NDA DRNG 13517 SE 169TH PL CUL VERT BLEW TRASH RACK/ CEDAR ES 688G2 1990-1165 C ORNG 13421 SE 189THPLACE 13517 SE 169TH PL 68602 1990-1155 NOA DRNG 13421 SE 189TH PLACE REF 90-1106 686G2 199~·1156 C ORNG 13429 SE 189TH PLACE 13517 SE 189TH PL 68\lG2 1990-1156 NOA ORNG 13429 SE 189TH PLACE REF 00-1106 686G2 1990-1157 C DRNG 13435 SE 169TH PLACE 13517 SE 189TH PL 686G2 1990-' 157 NDA DRNG 13435 SE 189TH Pl.ACE REF 90-1106 688G2 199().1158 C DRNG 18917 SE 189TH Pl.ACE 13517 SE 189TH PL 68BG2 1990.' 158 NOA ORNG 18917 SE 189TH PLACI: REF 90-1106 68EIG2 1990-1159 C DRNG 13523 SE 169TH PLACE 13517 SE 189TH PL 686G2 Page 1 of 3 ..;,1.._ WLKL' l"IU. lid.::: ~ : ,,., of ""*"" Mll'Bll llf Prda £mlal1I Tll'tla PaQII llm• 1990-1159 NOA DRNG 13523 SE 189TH PLACE REF 90·1106 686G2 1990-1160 C DRNG 13529 SE 189TH PLACE 13517 SE 189TH PL 6B6G2 1990-1160 NDA DRNG 13529 SE 169TH PLACE REF 00-1106 686G2 1990-1630 C FLOG 19114 130THAVE SE STREAM OVERFLOW S86G2 1991-1090 C DRAINAGE 18532 131STAVE SE WATER PONDS IN YARD 666G2 1991-1090 NOA DRAINAGE 18532 131ST AVE SE YARD PONDS 686G2 1991-1090 SR DRAINAGE 16532 131STAVE SE TOCIP 686G2 1993-0641 wee SEDIMENT 13120 SE 192NDST 6S6G2 1994-0676 WQC GREENH20 SE 192ND & 134TH A SE DUCKWEED 686G2 199~0170 WQC OIL/CARS 19312 133RDAVE SE RESIDENTIAL CAR MAINTENANCE ~88G2 1995-0374 C FILLING SE 192ND & 134TH SE WETLAND· REFD TO DOES 686G2 1996-0391 FCR PONO? 19118 130TH PL SE HOLO-GPR WILL CALL HER 4 MORE OETAI 686G2 1998-0301 NOA PONO? 19116 130TH Pl SE HOLO-GPR WILL CALL HER 4 MORE OETAI 686G2 1996-0391 R POND? 19118 130TH PL SE HOLD-GPR WILL CALL HER 4 MORE DETAI B86G2 • 1996-0480 C CRKFLDS 13607 SE 192ND ? GROUNPWATER IMPAC'T WAT'J'. PONDI 686G2 1996·0~21 FCR RID POND 13341 SE 195TH ST OUTLET PIPE OBSTRUCTED ASSESSMEN 6B6G2 1998-1428 C SWALE 18914 129TH PLACE SE OFFSITE FLOW IMPACTING PVT ORNG SY 68602 1996-1428 NOA SWALE 18914 128TH PLACE SE OFFSITE FLOW IMPACTING PVT DRNG SY 6B6G2 1996-1428 R SWALE 18914 129TH PLACE SE Of'FSITE FLOW IMPACTING PVT ORNG SY 88602 1995-1550 C ORNG 19121 124THAVI': SE PLUGGED 0/W CULVERT IMPACT TO PVT 6B6F2 1996-1894 C RUNOFF 13416 SE 187TH WATER OVER S10EWAL1< GROUNOWATE 686G2 1997-0940 C PRNG 13007 SE 188TH PL GROUNOWATERISHEETFLOW PONDING B86G2 1997-1179 C DRAINAGE 19113 121ST PL SE :NSTALLATION OF DRNG IN RN/ OLD/OFF 886F2 1997-1179 NOA DRAINAGE 19113 121STPL SE INSTALLATION OF DRNG IN R/W OLD/OFF 686F2 1997-1178 R DRAINAGE 19113 121ST PL SE INSTALLATION OF DRNG IN RN/ OLD/OFF 686F2 1997-1301 C DRAINAGE 19125 121ST PL SE SUBSTANDARD INSTL OF DRNG SYS PVT 686F2 1997-1319 FCR DUMPING 21709 146THST E DUMPED BATIERY IN RID POND 686G2 1998-0926 C DRAINAGE 19133 121ST PL SE APPARENT OBSTRUCTION IN ROAD ORN 68tiF2 1999-0174 FCR CLGINI.ET 13415 SE 187TH PL INLET PIPE APPARENTLY bBSTRUCTED 686G2 1999-0449 C SPRINGS 13518 SE 186TH PL NEW $FR GROUND WATER INFIL ONTO P 686G2 1999-0632 C EASEMENT 19114 130THAVE SE INFO PROVIOEO AeOUT RIO POND ON i>R 686G2 1998-0679 FCR FENCE 15932 133RDPL SE LEANING FENCE NEEDS REPAIR 68002 2000-0398 C DOM 1262$ SE 192NDST REQUEST TO DNERT FLOW DISCHARGIN 686F2 2000-0735 FCR MNM 18000 134THAVE SE CEDAR BOARD FENCE AROUND PERIMET 686Gl 2001-0548 WOP WQP 13120 SE 192N0ST 886G2 2002·0094 Fl REM 13055 SE 192ND ST SWM#a3 REMEASURE OF ORIGINAL 17.7 8UG2 2002-0094 FlR REM 13055 SE 192NDST SWM1153 REMEASURE OF ORIGINAL 17.7 686G2 2on-0204 FCR MMG 19000 134THAVE SE 1) PSE UTILITY BOX DAMAGED. CALLED 686GZ 2002·0424 C DOM 13003 SE 1UTH PL SINKHOLE DEVELOl>ED APPARENTLY 0V 686G2 2002-0424 NOA· DOM 13003 SE 1881H PL SINKHOLE DEVELOPED APPARENTt. V OV 686G2 Page 2,0 KC WLR:> N0.102 F,3/3 Cfflllllrl! : TVII of PMlbN Allhn DI Pnllll• r.11111 lll'Ol 1'1118 llnlr 2002-0424 R DOM 13003 SE 188TH PL SINKHOLE DEVELOPED APPARENTLY CV 68602 20-J3-0266 C DDW 15759 130THAVESE LOCAL PONDING PROBLEM. MAY BE THE 686G2 2003-0545 WQR WQB 18601 126TH PL SE 666F2 2003-0762 WOA WOAI 19433 VASHON HWY SW BMPS a"' ALL IN PLACE 686F2 2003-0909 WQC WQDR 10001 126TH PL SE AUTO l'LUID RESIDUi, ON STREET AS A R M6F2 Page:l o/3 APPENDIX B-1 DRAINAGE COMPLAINT ANALYSIS (previously submitted) SOOS CREEK PLAT DRAINAGE COMPLAINT ANALYSIS LEVEL 1 TECHNICAL DESIGN AND INFORMATION REPORT FOR PRELIMINARY PLAT REVIEW For the King County DOES: SUBDIVISION FILE _ A03P0286 _ Richard A Boston Addendum to Report of January 26, 2004 Boston Design and Development Co LLC 425-226-2145: Neal M Jacques, P .E. Jacques Consulting 206-242-5322 Soos Creek Plat TIR 1 By Jacques Consulting March 20, 2004 TIR Addendum DRAINAGE COMPLAINTS King County records were examined tor downstream drainage complaints per core requirement #2. Note that at the discharge point this project contributes approximately 2% to the drainage basin flow thus requiring 14 mile investigation. But this report investigated southeasterly for one mile along the Soos Creek Basin (see attached map). The area was inspected and the County complaint listings tor a one mile mdjus were examined. The Soos Creek drainage basin in this area is relatnely flat wide and heavily vegetated (grass) with no erosion or flooding problems. The complaint list is attached but they all deal with issues which are uphill either west or east of the Soos Creek Basin. Only one was somewhat relevant, Complaint Number 96-1550, which is a class 1 issue (attached). This complaint in 1996, descnl>es the 18" culvert across 124th Ave SE at SE 192 as blocked and thus erosion over the 124* gravel road. The sohrtion, to unblock it, was done. The downstream flow :fi:om thj,, project does not flow in this location but because the project access road goes over it, it was included. In February 2004 property owners were notified of King County's plan to widen SE 192 fur a left tum lane, thus this culvert will likely be modified. The subject project final engineering will have consideration fur the revised County intersection design. The remainder of the complaints bad no relation at all with the project. The five page list and a map showning location of the most significant problems (eight ponding/flooding complaints) is attached fur general reference. These all involved tributary flows :fi:om west or east down into drainage systeDL'I flowing eventually into Soos Creek Basin. None have any relation to this projects drainage in the Creek itself. In conclusion, fur the suiject project drainage path, there is no indication of any category I, 2, or 3 issues with drainage within one mile downstream. Note the TIR downstream analysis dated Jan 26, 2004 fur additional discussion. Soos Creek Plat TIR 2 By Jacques Consulting March 20, 2004 656 5oos C'R~EI<. p4-~T AREA '!iJ:f.tSl_ .5 /+aw 1/IJ{.,. 'l)(?A, l'f"""' G.E' .. C?E A ·Fc:.R I MI vfi. D o,;.,,..N'" ~-A-1"'\.. \ 1 ~ SE Nt I:; ·--... , :::i ... ~ ~1 SE J184TH ;::I jL.__ 96TH --- ~ .... .... I SE 18.§.!l:I ST , ~ l_B8TH ST g1f60o "' ~ 'Jo-rs-.rm 2E .. < ,, __ _ T Ill ST ~' L~lli.!..L ti g_j l97T1 srl 198TH ST 4 ' -{ \ I .... \ .... + ! E '!..!/.m....Y ·~ 'ANTHEP \ '"-.,, "" L ~KE . \ "" SE 203RD t;;i,l ' . \ \ ,.,, . . ST / .:r:1 / ~UL.IE SCAI.. £! 12.ae' .,,,. H 1 .. .1.V.&..,J I SE 182/liisf 0 }af 186TH ST SE 187TH ST SE 1aar1. I sE 1aarH s.T-. 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Pltad; ~a:Sl:47 PM D 57 "" ...... .,... .. ., .... .,. .. -DIii . 1W&-0148 C EROSION 11!27 se llCl8TH ST GAi.EN CARIN t1 8l8F4 1877-oool C DRNG 12207 SE 11112ND ST 0 GOI..DEN HUS GaFl9 1m~c FLD6 11!2111!: SE192NDST li8llf'2 1'7I-CIIB> C PONDIM8 19M8 121STPLSE EAST OF 8ENSOM HWY ll86F2 1971Ml081 C OflNG 19248 121STPLSE 1161'2 1978-0085 C FlDG 20921 120TH AVE SE Ma<YARD 6IISF4 1911.ooe1 C DANG 19117 122NDPL SE BLOCICEDIEASr tll.l. ~ llll6FS 1881,0215 C DPl«3 111818 t22Y>PLSE Cr1I CAVING IN 681A 19111..QSIIO C R.DG 209t1 121J114 AV£ SE PANTHEFI LX AREA 1186F4 19IIM!l30 C FLOG 1llll00 SE191!N)ST EAST KENT AREA li88F2 - 19118 0414 X DNIG 12521 SE2112NOPL SYST1!M MAINTENANCE llllllRl 188+4I09t C OANC3 2llllS8 120TMAVE SE Dl1CH Fl.UN& 688F4 1....,3 R FLOG 13250 SE1112N>Sf 10 ROADS DIV.4 68111'2 191144)314 C fl.00 13290 SE 1111!ND ST SE 11112ND STl1S4TH AV£ Sl5 68IF2 191140324 C DANG SE 2IK1lf ST1124Tlt lsVE &ll8f8 198&-01FO C FlDG 18!117 SE 200ffl8T STORM ASI.ATED 689G4 t!lll&0371' E DRNG 12002 SE llll8THST Vllft Cfl'l'D PA0B. at OQCEO rtRIVFMAV ea&f'4 19118 DG79 C FLIJG 19111J7 131THPL SE SIOSION 881163 19116Gm C DAN0 132511 SE 11112NDST DRAINPIPE ll88G3 198110&:t.. ER DRNG 13250 se 11111NDST PROB CATD BY PAMT RVW l86G.'I 11181Mml2 C DANG 12240 SE 20011iST MAINTENANCl:OF u:,r &allF8 1111$-11CIO C FLD8 18413 SE axmtST LANO 1H Fl.000 PLAIN IILOCl<l:I> Pll'E 698G4 1888-1182 C DFING 1lm18 SE 20DlliS1' Sl;£111,,114&,mot\049t,048l,01117 1181184 1888-1182 ER DAN8 1371D SE 20lfflt ST (D6 Pl. l) PROlt ()Oft. 6lllllG4 19117..QIMG C FLDG 211236 127THPI. SE WATER l'flOloOEIBI IIORS 111-cl818 &8IIRI 19117--0300 C DANG 18701 SE 201srsr DOWNSPOUTS NOT CONNECTEl> lO DAN 88IIG4 19117~ ER VIOLATE 13701 SE l!01STST SEE as,.11a,. 1'M8 8Nl481,0317,0481! fl8IIGC 1811..(11117 c,. FLD8 1117118 SE 20JSTST DOWN$POl1TS NOT'~ 17-0.,00 118584 1887-0l!n C FI.DG 13'100 SE l!lll!NI) CT DOWNSPOUTS •1141, 11BI 87.Q$1J0,317, 1111184 11181.Qffl NIM (D&PLT) SWI lDIDIDNFFIOB 681183 11a7-0f92 C FUlG 13702 SE 8*1DCI' DOIIIINSPOUTS811-1146,11828NIOOQ.317, -84 1917.Qi75 C DITCH 19'UIT 124llf AVE se OfWNABE Ol1CH ON PfttJPERfV 8l6F3 1111-'IIMI! C DANB t94GO 1NlllAVE se l!ASEMl!tl1' EMCI.OSM DITCH 11116m © 1887-Cl918 C DRN8 2112311 12Tllil'L SE WA"JSI UNDER HOUSE 87-GMI li1l6F4 ' 19117-0898 C DANG 1910 SE 1112NDPL 11 ERM. Fill. IN SOOS CREEi< li8IIGS 1087·1049 C TO AD COORD 04127J87. an t11118 0222 C DRNG 202IIII 132NDAVF. SE WATE'IFflOM NEW OEVB.DPEMENl" 881184 1'91015 I ................ . ........... ----. 7 I ii .... ,,.. .... .__ ........ .... -1188-fll!38 C A.nG 18431 1ZOTHAVE SE NEW DANeNAYWILL rT FLOOD 88'2 1918 U!!IS ER PIPE 111481 11UTKAVE SE NEED l:XTl!"8ION OF 411" CUL\/El'IT 88111'2 1911110239 C DRNG 13751 SE IIIIIINDPL WATER FROM a.EANED UP CREEK 6IIIIG4 1•11f41i C DANG 111815 133ADAVE SE UNfENCEI) Fl/0 PONDIINFO CfTOSWM-f' ~ 11181105lll C DANG 1941l 1:lllHPL SE NEM1 SOOS CAEEJ<IFIU.NI) Cl E•JIING ll8IIG3 1888-0551 C DANG 2II002 1ZffltAVE SE FLL INwenNIDS 6811'3 1988 CfNl6 C ORIG 191Z! 133RDAVE Cl& Bt.Oa(AGEINEW CONSTIWCTKlN 88863 1988cerlll E DANG 19122 1218RDAVE 1'£WDflAINIGE SYSEM 11111183 1888 II003 C DANG 111&12 12DTHAVE SE .INCREASED RUNOfFiQtANNEl lllllf2 19500111 C DANG 19400 1ll41HAVE SE Dm:H IWNTlNANC£ l!IIIR 1989 D04II C DRNG 20260 t82NDAVE SE (M) FUAESI GISl)SO()S A.OOD Pl.AIM 68164 19(1192 C DANG 1.,2 121111t AVE SE )( PIPE NOT WOAIClNB 888F'l 1989 0828 C DANG 1220e SE 2CKTHSf 8UIUlEA OF NEW HOME IMFORIEDFILL 8lllf'4 18IJ9.0410 C DANG 12213 SE 199THST PONDING INDRAINAGE~ I IA© 198110619 C DPIG 14439 t43FIDPL SE CONST ON HSN ttOlllli'WET YN'O -19890554 C OfM 121125 SI! 20ffllST l!ftUS10tt t1F VANIS IN NEW Fl.AT 88fF4 1Bflfi60 C DANG lll508 119ADPL S& DOWNSPOOTSEffOOINGYAJIID 89,41514 18111'4 191111 -· C EROSION 20IIQ8 123ADPL SE NEW HOME DOWNSPOVTSOPEN .aF4 11181Ml1!21 C DANG 187111 SE 111&THPL DRAINPFERUAm>Aloll · ~ 19IIIMl430 C FLDG 18755 SE lllll!N) Pl CREEK FLQOl)i;D HOIJSGSTURM . . 11111f>0494 C DMG 1841111 SE 200'THST sroNil -t!IIIO-IMIH NI». 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WATER OVER SIDEWALK lll6F4 11191-Q5711 E WJRSNI 20313 U2NOAYESE Olll&WM DIVPLY ..... 1!1111.Qli19 EH WTRSIN 211813 112N>AVE SE OHISWM DIV PLY 811111"4 1911-o&IIO C R.DG 20II08 111fflfAVE SE SMALL OIWN SYSTEM Cl OGGED ll88F,t 1811-G1811 S1 FLOG 12403 se l!IDl!NO PL aF<t 1991-1005 C DRAINAGE 11213 SE 1981NST l'Otll*GINYNDFfl~ =© 1991-111118 C OfWW3E 18114 SE 200THST, WATEfl INCAAWL SPAQ: 19'MOli8 Sft ~ 13714 SE IIIOTtlSf NOTNDAP 8111164 . 1882GIC'i0 C eAOBIOH 11513 tSllftDAVE SE HOME!OWNEl'IS'PONPO.F. flllG.1 1a ., ND,11 mcelON 1lll01 se 1!18Tlisr HOMS>UUIERS' PONDO.F. -199e0m> SR EROSION 19518 1S3Al>Ave SE HOMliDWNERS' POHDo.F, 11111183 1882 D&I &'I STUDY ~VEFIT UPGRADE 118111"4 1993-0310 C DANG" , .. 134T>IPL SE WETLAND~NCAAW 888G3 1!189-m10 N». DANG 191132 134THPL SE we'i'lAND~INCMW -199Nl310 RN DRNG 19182 1341'HPI. SE WEl1.ANDGfWllNG-DAAINA8 IN CRAW 118883 1111130:983 RN FLOG 047 11Tll1AVE SE UPSTREAM DEVE\.OPMENf fi8IF4 1-.cl412 C DANG 1l8IIO 184TH PLACE , SI: weTUIND CHJStNB OWERSION 68IIG3 1911H4t2 NOA DANG 191iOD 13CTHPLACE SE WETLAND CAtl8IN9 DIVERSION 8IIIG3 1983-0412 flN . DANG 1118110 13ffltl'LACE SE WE1l.Atl) CAUSING OIV&ASICfl ~ 1911H1177 C DANG 1374111 SE 1112NDPL ==T~1"ffSS J 189NS77 NOA DflNB 18145 SE 2Gl!ND PL 198N577 RN DflffG 13145 SE 2112NDPL PONDINB IN YARQ, NIW1C 111118116811 E EflOSION ... SE 2111Sf PL -1993 IIIIBO ER EROSION -SE 201STPL -1'81H1&81C FU)Q 20402 1SICIAVE se SIOSION RIOM1l£ Pl.AT OF GRAYSTON 111184 , •• , Al;', fUlG 20402 1SIN>AW SE EROSION FAOM TIE PLAT OF GFIE'rSTON aG4 19UD!82 C DANG , .. se lllffHST SURCtWW3E FROM C/8 IIIIIF4 1881H11!N \WA DI.WM ·125St SE llll8flD PLACE TOWQo\ ..... 18ll&O'l94 WClC DIM"IMG 11681 SE llaMl>PLACE TOWQ,\ ..... 19N Dllll8 C ORIG 1111130 1SITHPl se NmVe GMD1NG YIQU,TIONUl3IMJINI -198+011B C DANG ID44II t318rPL SE EIROIC9t AW.BOX POST 8lm64 , ...... C INQUIRY 12525 SE llll8RD Pl.AC£ Nf'f PIPES IN V#lffJ wtt:!RE SHE W1.L OI 888F4 tlllM-0431 C PONDING 1211Dt SE 202NDPL ~INGUTTER fl8IF4 1184U818 WQC QUl'fC8 111811l 133RDA. SE 68IIG8 1tlt DSIB WQE O&JIIIC8 1118112 13R>PL SE 681183 I .. _ ... ._,, T p I ... .,. ...... .. ., .... ...... L ..... -,~ C FU.LING 20411 182NOAVE se Fill. PLMlED Wl™IN seweR &>SBIENT 1111684 19111111113 NDA FLUNG 20411 132NDAYE SE FU PLACS> WITHIN SEWER EASSIENT 8IIIIG4 11186-00411 C ORNG 2111155 11MTHAVE SE WORK 11'1 WEn.ANDS CCKTACI' AINSI.E 888F4 19115-1l1111 C DANG 2080a 1f41HAYE SE Gl'IOUl'1) WATER a Pl/f DRAIN 81111F4. 11l915 IISll7 J( DflN8 -124THAYE SE WETLAND ON HIS PROPEATY 8ll8F4 1*°724 C CLEANOUT 2IISS4 111Sff'l. SE DAMN a E~ OU'l"OONST IMPAGT llll6G4 19118 ClllO C RIOPQC) ,.. SE 1911THST PI..U8GED Ola.VERT RID DISCHARGl: PIP &81183 19111 110111 C M>POHD 2111155 1141HAVE SE IXIWNSIAEIIM lMPIC1' FAOU RID OUTLE lll8F4 1MD1!45 C RUNOFF 115M 111!NDPL SE SI RING HU ELEMENTAFl'I' INFO RDS DI aF3 tlllll-0788 C fU)G 111282 SE 2lllffl-l ST FLCIODIHB Ol.iTO 910AM ANDSUBST'N :1® 111!1&G788 tlJA FlDG 122R 6E mmtST FLOOD1N8 DUE TI>STORM NID SIAIS'l'N 189&071l8 R FU>G 1223a SE lOOl"tlST FLOODING DUE TO STOflM AND SUBSTN ·.-111116-•i!!I C DANB 18121 1111fflf AVE SE PI..UGGFD OIW CU.V&l'T IMPACJ'TOl"lt' ~ ., .. 1-.11135 0 DfftG 200M 1:HTHAVE se ~ IW'flCN9IENT PflO.EC:rr IMPACT Ci8lll'8 , .. ,8'8 WQC DlM'ING 13809 SE 111mtST WAECICB> \IEH IN RO FACIUTY DIIWM IN83 1111&1908 E RIDFOND ,.,. SE 2SIN) Pt. F8ICli ENCAOMHENP INfOTRACr .. 191rf.0!191 C DRAINAGE 13Gll!8 se 208THPL PLUGGED PRIVATEYARODAAIN TA PAO 88IIQ4 19117-oBIII FCR FAC.COM ,..., AVE SE e SE 195-t!Nnll ICIDS NlCFBSOVEAFLOW PIPE NEl!DTR 88IG8 1117-11163 FCR RDPONO 19125 132ADPL SE WINDFALLS ADJ TO POND PAMS ltMlL Sllll$t 1917-11'19 C DMlfWaE 19'13 121STPL SE INSTMJ.ATION OF DRNG IN RIW OUWFF INIIIF2 '11117-1178 NOA OfMN,GE 19113 12tsrPL SE INSTAUATION OF DANG IN FWW OI.DIOFF G8ll'2 189'7-11'19 R OMNAGE 18113 12tSTPL SE INSDUATIONOF DfNJ IN R/W. OlOIOFF B8IIF2 11111'1-13111 C OfWN,\GE 1818 121STPL SE SUBSTNCIARD lNSJl. OF DflNB SY81"11' 681B 11117-160$ C TAEES , ... SE l!DlmfSf !WISE iOUS TIIEEfo ON ocunY f!ROf' 88IIF8 18111-1530 FCA FIID 19IIOO 138ADAYF. SE DEllflS & UTTER aoolCING TRASH MC li88G3 1197-1512 C TREE 12132 SE an!ST l&IIWN.. OF WINDFAUS FIEOl ltfe ..., 190108 WQC OLSPLL SE 8 S'Tl'1114 AVE SI: SPIU.OF POU.UT"ANfS ALONB fl>fl/W llll8AI 1111 121 Fell FENCi: 2111114 tent PL SE OAll'"GED FENCE ADJACl:NTTO F8IC& 88IF<I ISl-0381 C DIWNABE 11483 9E 18fl'l'H Pl. INFO MCUASI' REWl:TUNQIOPEN SPA IIIIIIFS ~FCR OR.'INIGE ,.,., SE e SE 1115-1911Ttf PWGGED TRASH IWlllS f'CN)INEI UPS'f eaeGS 1Mtaal FCR ADPLUGD SE 111111TH Sfl127TM AVE PLIJGAFD OFWlCE & Fl!NCI! REPAIR 6llllf\t 18118DIH c'· DfWIIIAGE 191311 12tSY'PL SE APPJMtll'OIISfftUOTIOlll IN~ DAN llllllf2 111111 n&08 C FENCE .1MIS SE 11NmfPL flEQUliB1' FOR FENCEBOI LARDS AT NXJ aFS 19111Ml911i FCR 'Pll!98FD 11llilll) 13SAOAVE SE PUMS> TIWIHRACICS DEIRSREMOY _., 21DD04l 3H 0 ODM 111825 8E 11111NDsr fll!CIUEST TO DIIIER1' FlOW OISCHMIGIN 88lf'lt 20CIIMM1& C MNM 122118 SE tomfPL VEGETATION GflOW1H IN TRIWI'. l1'MC'I' 1194 l!llOIMISD1 FCR MIIB 18815 1aaRDAVE SE DAIIIIC'IETO RID POND FRO I Sll.l eefft l88WI l!IIOIMl713 C DDIII 1218e SE :amt ST INCfll5ASE l'I.OWWS IMPACTIG DIWNPl IIIIF3 '\ . 211111M1713 NI»,. ODIi 1112112 se 200TH ST INCA!ASEFLOWSIMPNmNGDMNGE :;)® 2llll00713 R DOM 111282 SE 2lllmf ST INCflEASEROWB IMPAC'JlNG DIWfW3! "-4ol5 --. ·l'm.10.2004 5:38PM KC 1-LRD I~-.. -. t 57 I .......... ........ .... L ... -l!OO'I-G214 C 00M 2111111 121ffl!AVE SE llTILllY WORK DAM'6ED srue OUR DM ll8IIF4 200NJ416 wac WW)B 12232 SE lllllmfST CONCSW OP SOAP SUOS BEING lllSCHA B8llf'S 2001-0458 WQC WQB 12313 SE f9miBf APPARENT 1.ACk OFPOWITANJ" CON1A llllllFS 2001-(145$ WQA WQB 12313 ~ 191m1 sr Al'PAAENT ~Of POUJl'l"ANT CONl'R ll86F3 III01-ol71 FCR MNII -1STIMAVE se v&GETA110N GIIOWffl HEAVIERlHAN M ~ 2001-o&al' FCC WQD 1IM30 SE llOl1'tl ST N'PAAENTDUMPING OFPAINT OR?? INT 11161'4 2Dll1-4J832 WQfl WQD 1IIGI SE l!llll'H ST N'PfRENf DUMPING OF PAINT OR?? INT 1811H 2DOH02II C al"A 181118 SE lilOOnl sr INFORMATION REQUEST AEGAFIDINB PO ll8llG3 llllllMZ6I FCR 88R -131STPI.SE IIIO-SWAIJ: f!lmlO-FiT li88Gt 2IJDR-Ql!66 flET IISft 2113&8 131Sl"1'l.SE SICMIWMJ. AETROffl lllllG4 2Gm,04CJ8 C *M 111135 SE 191fTMST REQUEST"l'O FIEMOIIE 'Tl&S ON OOUN1' ellllRJ l!CJm.OIICa DOM I.AKEY EOl'181!ND Al'f'NW!Nf llEAV&flACl"IVITV IN SOOS C 8111184 2DOIHJ8D8 C DDM I.AIIEY EOF falM> APPMEN1" BEAVER ACTM1Y INSOOS C 6IIIG4 l!IJDM803 NOi,. 00N LAKEY EOft82ND #tWMENr BEAVER K1rMfV IN SOOS C 68IIG4 200lHIII03 R llDM I.AKEY EOF18N> APPARENI" BEAVER N:ITMrY IN SOOS C 6IIIG4 2llOa«i4S WQR WQ8 111111n usntfll.SE 88BF2 2IIOM7IR WO,. WQAI 19'3a VASHON HWI' SW BMPS •ALLIN Pl.ACE 68IF2 2llllMIIOI WQC WQllR 18601 1l!lmf Pt SE AUTO FUJID AESIOUI: ON 811 Ai AS A R 1188F2 2004-0188 FCR Mfl,f 1111S SE 2Qll14PI. ....... OIi glla.111\ .. , 5 •'"'-91l li8SF4 P9SOl5 APPENDIXC ANALYSIS AND DESIGN · lF L [E lUJ \Yl [E [] [E ~ \Yl lO) ~ L [E ~ I (C lO) (@(@[E ~ f L~ 1r~ [E)X{~~ir~~(@ ~~1r[E \ '\ 1 -----•------~~~-'-/"'""7"~\ \ ,.,,,, /UQ/U.fU :::':'·l'UT /, •-" --71 """'"'., .,,_-. Waa' ~:~;~: ~'.~ ··,;·, .. .,,. N EB EXISTING SITE: ~-_.,-,,• COGGER 0 I 75 I \ \ \ \ LEU~ DES· VOILES\ \ \ \ \ 150 : FOREST: 303,801 (6.97) BUILDING: 1,364 (0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) SCALE: !" = 150 fl TOTAL: 334,208 (7.67) -[F[L[E(UJ\Yl[E [D)[E~ \Yl(O)~ [L[E~ I ~(O)t8J(G][E[R1 f [L~ 1r~ f [R1(0)f(O)~[E[D) ~~1r[E ."--~F." U, ' ' ,-----..,-,~----.-----··'- OGGER N EB PROPOSED SllE SF (AC): BY-PASS SF (AC): \ re\ 1 \ I I \ \ \ \ LEU~ DES· VOILES \ \ \ \ c:,_,p : :·,-,•,--ec,>1 ,1~t/;/,::~-~.::} .~ --~/~~~~~~~~:+'.-· -- ' I , c-·~n ,_ 01 , T 0 I 75 I ISO : BUILDING: 4,592x47x0.7 = 151,077 (3.47) PAVEMENT: 55,367 (1.27) PAVEMENT: 14,864 (0.34) TOTAL: 14,864 ( 0.34) SCALE: 1" = 150 fl POND: 14,000 (0_32) LANDSCAPE: 98,899 (2.27) TOTAL: 319,343 (7.33) ROOF AND D/WS: (70% OF LOT AREA OR 4,000 SF -'MilCHEVER IS LESS) KCRTS Program ... File Directory: C:\KC_SWDM\KC_DATA\ [CJ CREATE a new Time Series ST 6.97 0.00 0.000000 0.00 0.00 0.000000 0.39 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.31 0.00 0.000000 exist.tsf T 1. 00000 T [CJ CREATE a new Time Series ST 0.00 0.00 0. 000000 0.00 0.00 0.000000 2.27 0.00 0.000000 0.00 0.00 0. 000000 0.00 0.00 0. 000000 0.00 0 .00 0.000000 0.00 0.00 0. 000000 5.06 0.00 0. 000000 dev.tsf T 1.00000 T [CJ CREATE a new Time Series ST 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 o. 00 0.00 0.000000 0.00 0.00 0.000000 0.34 0.00 0.000000 bypass.tsf T 1. 00000 T [Tl Enter the Analysis TOOLS Module [Pl Compute PEAKS and Flow Frequencies exist.tsf exist.pks [Pl Compute PEAKS and Flow Frequencies dev. tsf dev.pks [Pl Compute PEAKS and Flow Frequencies bypass.tsf bypass.pks [R] RETURN to Previous Menu [Xl exit KCRTS Program pond.exc Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Page I Fleuve des Voiles & Cogger Plats Runoff Cales 3/29/06 Flow Frequency Analysis Time Series File:exist.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.519 2 2/09/01 18:00 0.198 7 1/05/02 16:00 0.444 3 2/28/03 3:00 0.085 8 B/26/04 2:00 0.261 6 1/05/05 8:00 0.425 4 1/18/06 16:00 0.388 5 11/24/06 4:00 0.745 1 1/09/08 9:00 Computed Peaks Flow Frequency Analysis Time Series File:devl5.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 2.34 6 B/27/01 18:00 1. 64 8 1/05/02 15:00 4.96 2 12/08/02 17: 15 1. 88 7 B/23/04 14:30 2.76 5 11/17 /04 5:00 2.77 4 10/27/05 10:45 3.25 3 10/25/06 22:45 7.01 1 1/09/08 6:30 Computed Peaks Flow Frequency Analysis Time series File:bypass.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.082 7 2/09/01 2:00 0.073 8 1/05/02 16:00 0.100 3 12/08/02 18:00 0.084 6 8/26/04 2:00 0.100 4 10/28/04 16:00 0.088 5 1/18/06 16:00 0.123 2 10/26/06 0:00 0.161 1 1/09/08 6:00 Computed Peaks Level 1 Det Pond (4' deep) Qmax = (4/3*0.261)-0.084 0.26 Ht= 3/4*4 = 3' sumpks.txt -----Flow Frequency Analysis------- -Peaks Rank Return Prob (CFS) Period 0.745 1 100.00 0.990 0.519 2 25.00 0.960 0. 444 3 10.00 0.900 0. 425 4 5.00 0.800 0.388 5 3.00 0.667 0.261 6 2.00 0.500 0.198 7 1. 30 0.231 0.085 8 1.10 0.091 0.669 50.00 0.980 -----Flow Frequency Analysis------- -Peaks Rank Return Prob (CFS) Period 7.01 1 100.00 0.990 4.96 2 25.00 0.960 3.25 3 10.00 0.900 2.77 4 5.00 0.800 2. 76 5 3.00 0. 667 2.34 6 2.00 0.500 1. BB 7 1. 30 0.231 1. 64 8 1.10 0. 091 6.33 50.00 0. 980 -----Flow Frequency Analysis------- -Peaks Rank Return Prob (CFS) Period 0.161 1 100.00 0.990 0.123 2 25.00 0.960 0.100 3 10.00 0.900 0.100 4 5.00 0.800 0.088 5 3.00 0.667 0.084 6 2.00 0.500 0.082 7 1.30 0.231 0.073 8 1.10 0.091 0.148 SO.OD 0.980 Pagel Fleuve des Voiles & Cogger Plats Preliminary Detention Sizing Date: 3/29/06 Retention/Detention Facility Type of Faci.li ty: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Effective Storage Depth: Stage O Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Detention Pond 3.00 H;lV 184.02 ft 61. 34 ft 11288. sq. ft 19549. sq. ft 0. 449 acres 4.00 ft 0.00 ft 57698. cu. ft 1. 325 ac-ft 4.00 ft 12 .00 inches 2 Full Head Pipe Orifice ff Height (ft) 0.00 3 .00 Diameter {in) 2.19 2 .34 Discharge Diameter 1 2 Top Notch Weir: None Outflow Rating Curve: None {CFS) {in} 0.260 0.149 6.0 Stage Elevation Storage Discharge (ft) (ft) (cu. ft) (ac-ft) (cfs) 0.00 0.00 0. 0.000 0.000 0.02 0.02 226. 0.005 0.020 0.05 0.05 566. 0.013 0.028 0.07 0.07 794. 0.018 0.034 0.09 0.09 1022. 0.023 0.039 0.11 0.11 1251. 0.029 0.044 0.14 0.14 1595. 0.037 0.048 0 .16 0.16 1825. 0.042 0.052 0.18 0.18 2056. 0.047 0.056 0.28 0 .28 3219. 0.074 0.069 0.38 0.38 4397. 0.101 0.080 0.48 0.48 5589. 0.128 0.090 0.58 0.58 6797. 0.156 0.099 0.68 0.68 8020. 0.184 0.107 0.78 0.78 9258. 0.213 0.115 0.88 0.88 10512. 0.241 0.122 0.98 0. 98 11781. 0.270 0.129 1.08 1.08 13065. 0.300 0 .135 1.18 1.18 14365. 0.330 0.141 1.28 1.28 15680. 0.360 0.147 1.38 1. 38 17011. 0.391 0.153 1. 48 1. 48 18358. 0 .421 0.158 1.58 1.58 19720. 0.453 0.164 1. 68 1. 68 21099. 0.484 0.169 1. 78 1. 78 22493. 0.516 0.174 1. 88 1.88 23903. 0.549 0.178 1. 98 1.98 25330. 0.581 0.183 2.08 2.08 26772. 0.615 0 .188 2.18 2.18 28231. 0.648 0 .192 2.28 2.28 29706. 0.682 0 .196 2.38 2.38 31197. 0.716 0.201 2.48 2.48 32705. 0.751 0.205 2.58 2. 58 34229. 0.786 0.209 2. 68 2. 68 35770. 0.821 0.213 2.78 2.78 37328. 0.857 0 .217 2. 88 2.88 38902. 0.893 0.221 2. 98 2.98 40493. 0.930 0.225 3.00 3.00 40814. 0.937 0.225 3.02 3.02 41134. 0.944 0.227 3.05 3.05 41611. 0.955 0.233 Percolation (cfs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Surf Area (sq. ft) 11288. 11318. 11362. 11391. 11421. 11451. 11495. 11525. 11554. 11703. 11853. 12003. 12154. 12306. 12458. 12612. 12766. 12920. 13076. 13232. 13388. 13546. 13704. 13863. 14023. 14183. 14344. 14506. 14669. 14832. 14996. 15161. 15326. 15492. 15659. 15827. 15995. 16029. 16063. 16113. 3.07 3. 07 41940. 0.963 0.241 0.00 16147. 3.10 3 .10 42425. 0.974 0.251 0.00 16198. 3.12 3 .12 42749. 0.981 0.264 0.00 16232. 3.15 3 .15 43237. 0.993 0.279 0.00 16283. 3.17 3 .17 43563. 1.000 0.293 0.00 16317. 3.20 3.20 44053. 1. 011 0.298 0.00 16368. 3.22 3.22 4 4381. 1. 019 0.303 0.00 16402. 3.32 3.32 4 6030. 1.057 0.321 0.00 16573. 3 .42 3.42 47695. 1.095 0.337 0.00 16744. 3.52 3.52 49378. 1.134 0.351 0.00 16916. 3. 62 3. 62 51079. 1.173 0.365 0.00 17089. 3. 72 3. 72 52796. 1.212 0.377 0.00 17263. 3.82 3.82 54531. 1.252 0.389 0.00 17437. 3. 92 3.92 56284. 1.292 0.400 0.00 17612. 4.00 4 .00 57698. 1. 325 0.409 0.00 17753. 4 .10 4.10 59483. 1. 366 0. 727 0.00 17929. 4.20 4 .20 61284. 1. 407 1.300 0.00 18106. 4.30 4 .30 63104. 1.449 2.040 0.00 18284. 4. 40 4.40 64941. 1. 491 2.840 0.00 18463. 4.50 4.50 66796. 1.533 3 .130 0.00 18642. 4. 60 4.60 68670. 1.576 3.400 0.00 18822. 4.70 4.70 70561. 1. 620 3.640 0.00 19003. 4.80 4 .80 72470. 1. 664 3.870 0.00 19184. 4. 90 4. 90 74398. 1. 708 4.080 0.00 19366. 5.00 5.00 76344. 1. 753 4.280 0.00 19549. 5.10 5 .10 78308. 1. 798 4.480 0.00 19733. 5.20 5.20 80290. 1.843 4.660 0.00 19917. 5.30 5.30 82291. 1.889 4.840 0.00 20102. 5.40 5 .40 84311. 1.936 5. 010 0.00 20288. 5.50 5,50 86349. 1.982 5.170 0.00 20474. 5.60 5.60 88405. 2.030 5.330 0.00 20661. 5. 70 5. 70 90481. 2.077 5.490 0.00 20849. 5.80 5.80 92575. 2.125 5. 640 0.00 21038. 5.90 5. 90 94689. 2 .174 5.780 0.00 21227. 6.00 6.00 96821. 2.223 5.920 0.00 21417. Hyd Inflow Outflow Peak Storage Stage Elev {Cu-Ft) {Ac-Ft) 1 2.87 1. 99 4 .29 4.29 62984. 1. 446 2 1.43 0.92 4 .13 4 .13 60102. 1.380 3 1. 89 0.41 4.00 4.00 57663. 1.324 4 1. 52 0.38 3.71 3.71 52577. 1.207 5 1. 71 0.36 3.56 3.56 50040. 1.149 6 1.01 0.22 2.80 2.80 37609. 0.863 7 1.31 0.17 1. 65 1. 65 20723. 0.476 8 1.18 0.18 2.00 2.00 25571. 0.587 Hyd R/D Facility Tributary Reservoir POC Outflow Outflow Inflow Inflow Target Cale 1 1. 99 0.16 ******** ******* 2 .05 2 0.92 0.08 ******** ******* 0. 97 3 0.41 0.12 ******** 0.44 0.44 4 0.38 0.09 ******** ***"'*** 0.41 5 0.36 0.10 ******** ******* 0.38 6 0.22 0.06 ******** 0.26 0.26 7 0.17 0.08 ******** ******* 0.23 8 0.18 0.07 ******** ******* 0.21 ---------------------------------- Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdout POC Time Series File;dsout Inflow/Outflow Analysis Peak Inflow Discharge: 2.87 CFS at 6:00 on Jan 9 in Year 8 Peak Outflow Discharge: 1. 99 CFS at 10:00 on Jan 9 in Year 8 Peak Reservoir Stage: 4.29 Ft Peak Reservoir Elev: 4 .29 Ft Peak Reservoir Storage: 62984. Cu-Ft 1. 446 Ac-Ft Add Time Series:bypass.tsf Peak Summed Discharge: 2.05 CFS at 10:00 on Jan 9 in Year 8 Point of Compliance File:dsout.tsf Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks --Rank Return Prob (CFS) (CFS) (ft) Period 0.924 2 2/09/01 16,00 1. 99 4 .29 1 100.00 0.990 0.184 7 12/28/01 17,00 0. 924 4.13 2 25.00 0. 960 0.356 5 2/28/03 7,00 0. 409 4 .00 3 10.00 0.900 0.168 8 8/26/04 6,oo 0.375 3.71 4 5.00 0.800 0.218 6 1/05/05 15:00 0.356 3.56 5 3.00 0. 667 0.375 4 1/18/06 23,00 0.218 2.80 6 2.00 0.500 0.409 3 11/24/06 8,00 0.184 2 .OD 7 1. 30 0.231 1. 99 1 1/09/08 10,00 0.168 1. 65 8 1.10 0.091 Computed Peaks 1. 64 4. 25 50.00 0.980 Flow Frequency Analysis Time Series File:dsout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- F'low Rate Rank Time of Peak --Peaks Rank Return Prob {CE'S) (CFS) Period 0.965 2 2/09/01 16:00 2. 05 1 100.00 0.990 0.205 8 12/28/01 15,00 0.965 2 25.00 0.960 0.384 5 2/28/03 5,00 0.444 3 10.00 0.900 0.226 7 8/26/04 2,00 0.412 4 5.00 0.800 0.257 6 1/05/05 8:00 0.384 5 3.00 0.667 0. 412 4 1/18/06 21 :00 0.257 6 2.00 0.500 0.444 3 11/24/06 6,oo 0.226 7 1.30 0.231 2.05 1 1/09/08 10,00 0.205 8 1.10 0.091 Computed Peaks 1. 69 50.00 0.980 ~ Cl) LL () ---Q) e> (G .c u . !!! 0 10 ID , rdout.pks in Sea-Tac • dsout.pks exist.pks Return Period 2 5 10 20 50 100 10,"-+-----------------------~--- Q • 000 ___ _ • 10-'-+---------------------------~ 1 2 5 10 20 30 40 50 60 70 80 Cumulative Probability 90 95 98 99 Treatment Pond Sizing Routine Project: Fleuve des Voiles & Cogger Plats Treatment Pond Date: 3/29/2006 Blue represents manual entry fields Red represents calculated fields Step 1: Wetpool volume factor (f) ... either 3 or 4.5 f= 3 Step 2: Mean annual rainfall (R) ... from Fig. 6.4.1.A, pg 6-69 R= 0.47 in Step 3: Runoff (Vr) ... Vr=(O .9Ai+0.25Atg+0.1 OAtf+O .01 Ao)xR/12 Ai= 220,444 sf Atg = 98,899 sf Alf= O sf Ao= O sf Vr= 8,739 cf Step 4: Wetpool volume (Vb) ... Vb=fVr Vb= 26,217 cf Step 5: Wetpool dimensions ... Vb=h(A1+A2)/2 Solve by trial & error A1= 15,995 sf L= 73 ft 3L = 219 ft h= 4 ft S= 2 ft A2= 11,578 sf *Vb= 55,146 cf *if Vb calculated in Step 5 < Vb from Step 4, then increase h Drainage Cales FV.xls (Treatment Pond ) 3/29/2006 APPENDIX D MAINTENANCE REQUIREMENTS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES • MAINTENANCE AND OPERATIONS MANUAL FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES ADDRESS: 16217 1141h Avenue SE Renton, Washington RETENTION/DETENTION FACILITIES The purpose of both the detention pond is to reduce the rate of runoff from the developed portions of the property. Water can flow freely into the pond, but orifices in the outflow riser restrict the outflow. When the inflow exceeds the capacity of the orifice, the excess water is "stored" in the pond, and released slowly after the storm abates. In order to function properly, the facility must also be kept free of accumulated sediment. The outlet and connection pipes also must be kept clean, as even a partial blockage could significantly impact the ability of the facility to store runoff. The facility should be visually inspected for sediment accumulation and blockages at least once each year and also after every major storm greater than or equal to a 10-year return frequency. WATER QUALITY TREATMENT FACILITIES The purpose of both the permanently wet portions of the pond and the cartridge filter treatment catch basins is to reduce the level of contaminants in the runoff water, through filtration and sedimentation, though the plants in the wetpond will also reduce pollutants though bio-uptake. It is essential that the water quality pond have calm conditions be inspected regularly for accumulation of sediment. The pond should be visually inspected for sediment accumulation and blockages at least once each year and also after every major storm greater than or equal to a 10-year return frequency. The cartridge filter treatment catch basins should be maintained in accordance with the manufacturer's recommendations. CONVEYANCE SYSTEMS Pipes transport runoff from one place to another, in this case from catch basins to the pond, then to the downstream drainage system. To work properly, pipes must be kept free of silt and other debris. If pipes become blocked, surface flooding will usually occur. CATCH BASINS AND AREA DRAINS Catch basins collect surface drainage and direct it into storm conveyance pipes. They help prevent downstream drainage problems by trapping sediment and other debris that would otherwise flow downstream with the runoff. It is important to keep catch basins clean so accumulated silt is not flushed out during a significant storm. Also, if the outflow pipe becomes blocked with debris, surface flooding will usually occur. All catch basins should be inspected at least once each year and after major storms. Area drains convey runoff directly into conveyance pipes. To prevent surface flooding, their surface grates must be kept free of litter and debris. If dirt or other sediment gets into the pipes and they become blocked, the pipes will need to be cleaned, either manually or using a Vactor truck. The following tables identify maintenance issues, which should be addressed regularly, describing possible problems with the drainage system and their respective solutions. • • APPENDIX E BOND QUANTITIES WORKSHEET (not included in this preliminary report) RETENTION/DETENTION FACILITY SUMMARY SHEET & SKETCH DECLARATION OF COVENANT (not included in this preliminary report) ,. ' • KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL STORMWATER FACILITY SUMMARY SHEET ODES Permit Number__,_1/,_,0.._?,_,/Jc..,0.,,,l'"'J,"'t,"-_ (provide one Stormwater Facility Summary Sheet per Natural Discharge Location) tJJ 'f Pu QJ 2. Overview: Project Name Heu ve d€'.[ k{,· /,.. [ P;,,. I {!~9er JAorl-/'/J- Downstream Drainage Basins Major Basin Name /.-..a.ff tt/m,41/o,,, Immed1ate Basm Name -''""lull:1J.'l.)_f_!?;;:L_!...rl!<C~c...,f/c::_ ___ _ Flow Control: Flow Control Facility Name/Number _f,w,QLJY11u,b_udce11:.,/=-,/L..f.:L:LC-l/c__,,f"n"'0Lnuda.__ If none, Flow control provided in regional/shared facility (give location), ______________ _ No flow control required Exemption number------------- General Facility Information: Type/Number of detention facilities: _L_ponds Type/Number of infiltration facilities: ___ ponds vaults tanks tanks trenches Control Structure Location _..1N=l<d'i.LJ _ _L(.;-0.u.r:Lt\ueu:r_~o'...!/Li17=o~n,,.c/"1.._ _____________ _ Type of Control Structure _ _sC'-''t"--__,{)=,-,L!"/;.,_,,.;_,"-£'-""-_..µ,e'"',,-'--Number of Orifices/Restrictions _ _:_;2 ___ _ Size of Orifice/Restriction: No. I '2,/9 No. 2 _..<c2,._,, ~,,'f,__ __ No. 3 ______ _ No. 4 ______ _ Flow Control Performance Standard level 1 (adi ~ s/mp,} J ii Live Storage Volume __ f.,_ ___ 7CJJ~~"'--'}Laf--Depth ¥ Volume Factor of Safety ______ _ Number of Acres Served 7 3 '? NumberofLots__,~"-9L-'-r_,S',__ __ _ Dam Safety Regulations (Washington State Department of Ecology) Reservoir Volume above natural grade tl, t1'f e/ ~ Depth of Reservoir above natural grade __ ' ~/_' __ _ Facility Summary Sheet Sketch ( ,U "d, ,;,_ 5 -s;..,,. p /<vru) All detention, infiltration and water quality facilities must include a detailed sketch. (11 "xl 7" reduced size plan sheets may be used) 2005 Surlace Water Design Manual 1 1/1/05 f KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Water Quality: Type/Number of water quality facilities/BMPs: biofiltration swale ___ sand filter (basic or large) (regular/wet/ or continuous inflow) ___ sand filter, linear (basic or large) _{ __ combined detention/wetpond ___ sand filter vault (basic or large) (wetpond portio~r large) sand bed depth ___ (inches) combined detention/wetvault stormwater wetland ___ filter strip storm filter ___ flow dispersion ___ wetpond (basic or large) ___ farm management plan wetvault ___ landscape management plan ___ ls facility Lined? ___ oil/water separator If so, what marker is used above (baffle or coalescing plate) Liner? ________ _ _2__ catch basin inserts: Manufacturer 'Scl-o,::oy..ucJ.e r 3 '1J ___ pre-settling pond ___ pre-settling structure: Manufacturer __________________ _ ___ high flow bypass structure (e.g., flow-splitter catch basin) source controls------------------------- Design Information Water Quality design flow __ _,0"'-',0,,_,,5c...,,ck.__,,_ _____ _ Water Quality treated volume (sandfilter) _______ _ Water Quality storage volume (wetpool) _ __,2"-(g"'+/--'7_""'-1]-L---"c.f"-- Facility Summary Sheet Sketch (_ p.-eNl.,~':f -S,u pl"-"' s) All detention, infiltration and water quality facilities must include a detailed sketch. ( 11 "x 17" reduced size plan sheets may be used) 1/1105 2 2005 Surface Water Design Manual I I Conceptual Wetland Mitigation Plan Plat of Fleuve de Voiles (L04P0002) King County, Washington June 22, 2005 Ltl-lvoooz_ o'l't ~c, AC ROTH ENVIRONMENTAL SERYlf~ f\\.l ;0 US-G'Srnm ·--~--'\9 Conceptual Wetland Mitigation Plan Plat of Fleuve de Voiles (L04P0002) King County, Washington Prepared for: Ravenna Development LLC 6839 Ravenna Avenue NE Seattle, WA 98115 Prepared by: Anthony Roth June 22, 2005 AC ROTH ENVIRONMENTAL SERVICES 11SNORTH4S™STREET • SEATILE,WAsHINGTON 98103 206.784.4755 Table of Contents Table of Contents Preface ............................................................................................ ii I. Introduction ................................................................................ I 2. Critical Areas Description ......................................................... 3 2.1 Overview ........................................................................... 3 2.2 Soos Creek Wetlands and Buffers .................................... 3 3. Project Impacts .......................................................................... 4 3.1 Soos Creek Wetland ........................................................ .4 3.2 Soos Creek Buffer.. ........................................................... 6 4. Conceptual Mitigation Measures ............................................... 7 4.1 Mitigation Overview ......................................................... 7 4.2 Vegetation Replacement and Enhancement.. ................... 8 4.2.1 Construction Sequence ............................................ 8 4.2.2 Pre-Construction Meeting .............. : ......................... 8 4.2.3 Implementation of the Planting Plan ....................... 8 4.2.4 Construction Observation ........................................ 8 4.2.5 Post-Construction Activities .................................... 9 5. Monitoring Program .................................................................. 9 5.1 Vegetation Establishment. ................................................ 9 6. Maintenance Plan .................................................................... I 0 7. Contingency Plan ..................................................................... 10 8. Performance Security ............................................................... 10 9. Bibliography ............................................................................ 11 List of Figures 1. Vicinity Map ..................................................................................... 1 2. Site Map ............................................................................................ 2 3. Conceptual Impact and Mitigation/Restoration Areas ..................... 5 List of Tables I. Wetland and Buffer Impact/ Conceptual Mitigation Surnmary ........ 4 2. Significant Tree Retention ................................................................ 6 Conceptual Wetland/Buffer Mitigation Plan Proposed Ptat of Fleuve des Voiles (L04P0002) Preface Preface This report has been prepared for the use of Ravenna Development LLC and consultants associated with the project. In preparing this report, AC Roth Environmental Consultants (RES) has used site information and plat design from Taylor Engineering Consultants, as well as a Wetland Evaluation and Delineation Report (Heckert 2004, attached). Findings reported herein are as well based on information gathered in the field at the time of investigation by RES, RES's understanding of the 1997 Washington State Wetlands Identification and Delineation Manual (Ecology 1997), and RES' s understanding of federal, state and local regulations governing wetland and stream areas. The recommended buffers are RES's best professional opinion based on the circumstances and site conditions at the time of its study. The final required buffers and setbacks are subject to change by the appropriate federal, state, and local jurisdiction. Prior to preliminary and final design or any construction, all appropriate regulatory agencies should be contacted to verify the findings of this report, and to obtain appropriate approvals and permits. Water resource and buffer determinations are subject to professional judgment consistent with the standards of professional practice. No warrantee of use of this document is expressed or implied. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) ii Introduction 1. Introduction The subject property is a 7.71 acre site located north of SE 192"d Street near its intersection with 1241h Avenue SE, and west of Soos Creek in Section 33, Township 23 North, Range 5 East, W.M, King County, Washington (Figures I and 2). The applicant proposes a 39-lot single family residential subdivision, consistent with the RS-6 zoning of the property. The purpose of this report is to present a Conceptual Wetland and Buffer Mitigation Plan, consistent v,ith those requirements of the King County Code (KCC) Section 21A which were applicable at the October 1, 2004 project vesting. Any code references herein will be consistent with pre-2005 Critical Areas Regulations. 2:1N Boe~"9 Longacns Industrial P_aril :;::E c,;,,:,~··· :~ u1 Figure 1 Vicinity Map Conceptual Wetland/Buffer Mitigation Plans Proposed Plat of Fleuve des Voiles (L04P0002) P.anth·er Lake ,_,., '1'. ·~,E ';(;·f'.t1i P; .;j "' 1:; "' tr:- i: 81iottO- lf._·:,1,, St ·:s1·· ©2004 NJ:\VTEQ 0 ' • . --~--.--· - C .- .~ I. k:, l~_,., .. •' /, '.' ~~~~~~\ -·-.... ,,<~ ~·' ']'''' F-"c;,,::_'-Y:;< ::',-~, ,, ,; ,; .. ~ ;'.' . ···,~.:~j . /·'.. I It )/ i I ' /·' 1·,.~ / ' >,(' ~""-:/ \ ·, ... _ _;;;,..,/ \ ... , ...:.:...:...-:_~---------~!.~-/_,, "' i-., ____ --·~ -~.-~:.._ '"·•--.: ,.,·.-r __ ~ >- E 21 ~ :, '-' ,:: 0 '-' h "O .:,_;; v, Q) ., § la, ',J I, co E .~ .0 "' ~ :, 0 ~ "' 0 C lr "' .!ll" ,:: n. 0 (1l C 2, a. 0 Q) """' <ll .!!! 3l c,·- ;E ~ 0 :;; "' "' ~ QJ el ,!11 'O ~ -QJ :, > Q. (D :, ftS i3 " :i: C U: .,_ !! "' 0 QJ -:s: .!ll ,,, -n. N <ll 'O 2 QJ Q.., e QJ 0 0 Q. :, C 0 0, 0 ~ u:: (.) a. Critical Areas Description 2. Critical Areas Description 2.1 Overview A Palustrine scrub-shrub wetland less than 2,500 square feet (sf) in area occurs in the northwest comer of the site and extends offsi te into the property to the northwest (Heckert 2004); Heckert(2004) notes that this wetland is not regulated by King County. As described by Heckert (2004 ), the site is forested and dominated by Douglas fir and big leaf maple, with sub-dominants of western red cedar, western hemlock, and red alder. Some cottonwood is found at lower elevation. The Soos Creek wetlands occur to the east of the property, as delineated and described by Heckert (2004) and portrayed in submittal documents. 2.2 Soos Creek Wetlands and Buffers Heckert (2004) indicates that the vegetation in the immediately offsite riparian wetland corridor associated with Soos Creek is a scrub-shrub community which has been subject to historic and ongoing human disturbance from powerline maintenance and installation of the Soos Creek Water and Sewer District (Sewer District) 8 inch sewer force main). Consistent with disturbed scrub-shrub areas, and based on a site visit in March 2005, the wetland vegetation adjacent to the instant proposal is dominated by a mix of Douglas spiraea, red-osier dogwood, and reed-canarygrass, with lesser constituents comprised of salmonberry, Sitka willow, slough sedge, buttercup, and willow-weed. Heckert (2004) cites that this wetland is a Class 1 wetland, under KCC Section 21A.06. !415. KCC 21A.24.320 requires a 100 foot (ft) buffer from Class 1 Wetlands. The westerly margins of the wetland buffer adjacent to the east side of the project is similarly impacted by human activity. This portion of the buffer is occupied by the northerly extension of the unopened right-of-way of !24th Avenue SE, now being used as the driveway to the existing offsite residence, plantings including non-native trees on the east side of the right-of-way, and lawn and shrubs on the west side of the right-of-way. Gravel has been placed on the driveway surface itself Northerly of the driveway, the right-of-way (including the wetland buffer) is dominated by Himalayan blackberry and has been subject to human disturbance. The remainder of the buffer to the east is a mix of scrub-shrub vegetation. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 3 Water Resources Evaluation 3. Project Impacts To provide sewer service, connection needs to be made from the proposed plat to Sewer District facilities in the Soos Creek wetlands. The trenching will also need to occur within a portion of the wetland buffer. Where such trenching°is proposed in wetlands and buffers, conceptual plans are to place steel plates or equal measures on either side of a proposed 4-foot wide trench to limit equipment pressures and soil disturbance and reduce the impact to the critical areas. Past experience with this method (Love 2005) has demonstrated that protection of underlying vegetation and surface soil structure leads to rapid recovery of such protected areas. In addition, unavoidable road alignment will result in the loss of some wetland buffer. Table I summarizes proposed impacts and conceptual mitigation areas. Table 1. Wetland and Buffer Impact/Conceptual Mitigation Summary (areas in sf) Lost Excavated Plate Impact Restoration Enhancement Addition Road Construction Buffer 2191 867 867 3408 676 Sewer Construction Wetland 356 838 1194 Buffer 857 945 1802 3.1 Soos Creek Wetland As discussed in Section 2.1 and shown on Figure 3, the Sewer District force main lies within the wetlands associated with Soos Creek. To provide for discharge of domestic wastewater from the plat, it will be necessary to construct an 8 inch gravity line which will extend into the Soos Creek wetland. The connection to the Sewer District system will require excavation of approximately 360 sf of wetland (Table I), with replacement of soils following installation. The impact from overlay of plating will be approximately 840 sf Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 4 I , A 1.C \ ·\. p / I -i-~ _1 ___ ,_u,,-____ --_l,'_Z>~_ -'-''~: \ '.>}";<,,;_" l ~\~ j-/c;:, ___ ,_,:,,_;.,.:,;,_ ~-t----t--.--~=--------~: :,~-~ ' ·-·-,1:--1'"-. \{,'//'./~,, . ____ ._,,_._.,._ ...,, r . ; >// -'_ -_ -!I' /-'<>Y: __ -j/~ J (, /// '{,_-: · · 1'e/;(,_> -\%_>:~; ti;;/,, --{1'fke1v.) ,-: tr· .,,, .. -I :f Ii r • ~ --/ : I: i 'l I I I 1: ,! . I -, I , , ; I I j I I i ,i 'i \ ,j -~ l I! \A 1? \ I I \ I '_)P-:'. I \ I I I I \ \ I I I I \ I I I '11\:,I \ I I I "'I I ,,\ I A J,:) ',-,;. I F, 1 >'\ \ I I fl I I I I I \ I \ I I I I ' I \ \ ~ .<d \ /i I I / / I I \ i\/:u1, I \ \ / I AC \ \ AA':3/ / I I I I I i \ I 117 AA2s\ Ai--i \ \\ AA.\··, '·,...__ \ \ I I I! I ! I ', I , ', \ \ \ A' I II -I I I I I I, \ J N I ~ -~~- SC-: Al F H: FEe, T C ?n ~O E,0 dCi J8C 11111 11111 1:J 3(• 5(1 :u CJO Figure 3. Conceptual Impact and Mitigation/Restoration Areas Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) Water Resources Evaluation SD·.JEli EXTEhSJ(Yi lM:'/!.CI l!Bj1j ~ m ~ W~T~6~0 ~lSTURBANCE J56 ::1r WETLA~IC OV=~~~-, !MPAC~t OJ8 SF G~~~~h nlSTURBANC~ 857 SF :=llFTEl"l 1:1 A' 11'10 uvE;:..;LL.Y IMP,'\['"' 9,15 s:=- ~OAn CONSTRJCllON lM~A~:: CZ] BUFFER LOSS, 2J91 SF ~ E,L_iFF-ER UlS l"LJRE:.A!\JC:::", E,67 Sr:- C:JNCEPTU/,L f..·1ITIGAT:::CN f·1'AS·.,'R[S1'itt ~ RlJFF-·c.:·; .:::"Nf-i.~r-iCEfi[:NT 3"1()8 SF ii:J b·Jf--"E:Y AULJl rro~.J. E.75 sr· -l(. :=:teeJ u:~,t~ u· equ:vi:lJen-:.. ·1:.,1:1 br=: r:·' 1< ,CJrJJac.r,it I,:; tne sewer· ~1-er1c!1 tc r·f,aJ:Jce 1r-ri:.: "* Ir-cdrJ1t1un tu~: rc:1p]acerrent uf C--i'1i.r:c11 5 -,,,:,:___, Water Resources Evaluation 3.2 Soos Creek Buffer As stated in Section 2.1, a significant portion of the I 00 ft Soos Creek wetland buffer within the project boundaries is occupied by the right-of-way of 124th Avenue SE. To minimize unavoidable impacts to the onsite buffer, the road network turns just at the margin of the common boundary with the existing residence whose driveway overlays the right-of-way. As detailed in Figure 3 and Table I, the impact from establishment of a right-of-way extension for the new road network within the buffer will result in the permanent loss of approximately 2,190 sf of wetland buffer, and approximately 870 sf of buffer will be disturbedduring grading and road construction, but will be available for replanting restoration .. The proposed installation of the 8 inch gravity sewer to connect with the Sewer District facilities will result in the excavation of approximately 860 sf of buffer, with buffer impact from plate overlay of approximately 945 sf. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 6 Mitigation Measures 4. Conceptual Mitigation Measures 4.1 Mitigation Overview As compensation for the impacts identified in the previous section, the applicant proposes the following mitigation goals: I. Consistent with the provisions ofKCC 21A.24.330 and KCC 21A.24.340, as compensation for 2191 sf of proposed lost low-value buffer function due to proposed unavoidable impact from road construction: a. vegetation structural enhancement of approximately of 3,410 sf of low-value wetland buffer and I b. addition and enhancement of 676 sf of low-value upland area adjacent to the entry road 2. Vegetational restoration of approximately 870 sf of low-value wetland buffer adjacent to the entry road, disturbed during grading operations. 3. Consistent with KCC 21A.24.330.F, and KCC 2 lA.24.340, replacement of approximately 360 sf of wetlands and 860 sf of wetland buffer proposed for unavoidable disturbance during needed sewer construction. 4. Enhancement of approximately 840 sf of wetlands and 945 sf of buffer subject to plate overlay during sewer installation. The specific performance standards necessary to achieve the mitigation goals will be: 1. At least 80 percent of all planted trees, shrubs, and herbs in buffer mitigation areas will survive a 3-year monitoring period. 2. At least 80 percent of all planted shrubs and herbs in wetland restoration/enhancement areas will survive a 3-year monitoring period. 3. Allow no more than 10 percent cover of the mitigation/restoration areas with invasive, non-native species during the 3-year monitoring period. 4. In second and third year, thin volunteer red alder and cottonwood to 10-foot centers within mitigation/restoration areas. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 7 Mitigation Measures 4.2 Vegetation Replacement and Enhancement During preparation of a final mitigation plan, a planting plan will be prepared which identifies the species, numbers, and locations of plantings for the buffer enhancement and restoration associated with the road encroachment and the wetland and buffer replacement/enhancement associated with the sewer line installation. Highlights of the construction plan are provided below. 4.2.1 Construction Sequence Implementation of this mitigation plan will involve six tasks: (1) finalization of the mitigation plan; (2) pre-construction meeting; (3) staking of the construction area; (4) installation of temporary erosion control; (5) construction; and (6) post- construction meeting 4.2.2 Pre-Construction Meeting A pre-construction meeting will be held on-site with the project proponent, landscape contractor, invited County staff, and a project biologist to review the final plan and to discuss the project. This meeting will allow all involved parties to understand the intent and specifications of the mitigation project. 4.2.3 Implementation of the Planting Plan Any construction of sewer appurtenances will be completed and native soils restored from the surface to a depth of 18 inches prior to implementing the planting plan. The planting plan for restoration of wetland and buffer habitat replaces and enhances the biological habitat support functions lost from the proposed wetland and buffer impacts. To provide as much diversity and biological support as possible, plantings will include native trees, shrubs, and herbs that are common in area native uplands and wetlands. 4.2.4 Construction Observation A project biologist will review the site periodically during mitigation implementation. The purpose of construction observation is to provide assistance to the contractor and client for the interpretation and proper implementation of the plan. The responsibilities of the construction observer may include, but are not limited to: providing explanations of unique construction or planting techniques; review of construction materials and nursery stock; review of plant locations; review of grade slopes; and review of TESC measures. It will be the responsibility of the contractors to verify that plan specifications have been met and provide the project biologist with an as-built plan of the planting. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 8 Monitoring Program 4.2.5 Post-Construction Activities After project installation, if the project is constructed per the final mitigation plan, a letter of compliance will be prepared by the project biologist for submittal to DDES. Should departures occur from the final mitigation plan, an as-built report will be submitted to DDES upon successful installation. Final plat approval will be subject to DDES inspection of the mitigation, subsequent to receipt of either the letter of compliance or as-built report. 5. Monitoring Program The objectives of the monitoring program over a three-year duration will be to assess restoration success in the wetland and buffer restoration areas. Results of all monitoring will be included in annual monitoring reports submitted to the attention of the appropriate staff at DDES by the end of each year. The monitoring results will be related to the performance standards and if warranted, recommendations for additional plantings, follow-on maintenance, and other measures will be made based on these findings. 5.1 Vegetation Establishment The establishment and success of the mitigation plantings will be evaluated annually during the 3-year of the monitoring program. It is proposed that DDES technical staff(supported by payment on the part of the applicant) will meet the project biologist for a 30-minute to one hour joint site visit on an annual basis to evaluate success, compared to the Plan. Planting success in the mitigation areas will be evaluated by visual inspection and documented by photographs taken at static reference sites, to estimate the survivorship ratio for the mitigation site. Based on plant survival estimates compared to the as-built plans, tree and shrub percentage survival will be developed on the basis of consensus between DDES staff and the project biologist. A Letter of Consensus summarizing each annual joint site visit will serve as the annual monitoring report. The first-year monitoring will serve as the one-year warranty inspection. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 9 Maintenance Plan, Contingency Plan, and Performance Security 6. Maintenance Plan The landscape contractor or owner, under direction of the monitoring biologist, will perform maintenance within the mitigation areas. Required maintenance activities will include temporary irrigation of new plantings, trash removal from restoration/enhancement areas, repair or replacement of critical area signage, and ongoing weeding. At the end of the second and third years, volunteer red alder will be cleared to ten feet, on center, throughout the mitigation areas. Non-native invasive species will not be allowed to exceed ten percent within any of the mitigation/restoration areas. 7. Contingency Plan The contingency plan will provide for replacing plants that have failed to survive, so that the performance standards continue to be met during the monitoring period. If warranted, a recommendation will be made to replace dead plants, either in-kind or with alternative native species. The contingency plan will be enacted in whole, or in part, whenever the action is warranted by the monitoring reports. If the desired mitigation goals, as measured by the monitoring program and performance standards, are not achieved, then a joint determination by DDES and the project proponent could be made to implement the contingency plan. 8. Performance Security During preparation of the final mitigation plan, a performance surety instrument will be developed and proposed for implementation to achieve project approval . Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 10 9. Bibliography Cowardin, L.M., V. Carter, F.C. Golet and E.T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. Office of Biological Services, Fish and Wildlife Service, U.S. Dept. of the Interior, FWS/OBS-79/31. Love, P. 2005. Personal communication. Senior Planner. City of Mukilteo, Washington. February 3, 2005. Munsell xxxx. Soil Color Charts, Kollmorgan Instruments Corporation, Baltimore, Maryland. Phinney, L.A. and P. Bucknell. 1975. Catalog of Washington streams and salmon utilization. Volume 1, Washington Department of Fisheries, 1975. Reed, P., Jr. 1988. National list of plant species that occur in wetlands: Northwest (Region 9). U.S. Fish Wild!. Serv. Biol. Rep. 88(26.9). Reed, P., Jr., et al. 1993. 1993 Supplement to List of Plant Species that Occur in Wetlands: Northwest (Region 9). U.S. Dept. Interior Fish Wild!. Serv. December 1993 Washington State Department of Ecology. 1997. Washington State Wetlands Identification and Delineation Manual. Publication No. 96-94. March 1997. --------------· 1993. Washington State Wetlands Rating System for Western Washington, Second Edition. Conceptual Wetland/Buffer Mitigation Plan Proposed Plat of Fleuve des Voiles (L04P0002) 11 APPENDIX A WETLAND EVALUATION AND DELINEATION REPORT, SOOS CREEK PLAT PROJECT SITE H & S CONSUL TING, 2004 A-Ui&~ 'Consulting WETLAND EVALUATION AND DELINEATION REPORT SOOS CREEK PLAT PROJECT SITE King County, Washington Section 33, Township 23 North, Range 5 East, W.M. prepared for Boston Design and Development 13425 E. Lk. Kathleen Dr. SE Renton, WA 98059 prepared by H & S Consulting P. 0. Box 731695 Puyallup, WA 98373 253 732-6515 mheckert@qwestnet May 26, 2004 • EXECUTIVE SUMMARY The Soos Creek Plat Project Site is approximately 7.26 acres in total size and located to the east of the City of Renton, King County, Washington. The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with single-family residences, managed and maintained lawns, and unmanaged portions. Onsite assessment of the project site following the procedures outlined in the Washington State Wetlands Identification and Delineation Manual (Wash. Manual) and the Corps of Engineers Wetlands Delineation Manual (1987 Manual) resulted in the identification of two areas that exhibited hydric soils, wetland hydrology, and hydrophytic vegetation consistent with the established criteria of both the Wash. and 1987 Manuals. This assessment, completed in accordance with King County regulations, included an evaluation of the function and value rating for the identified wetlands, a classification of the wetland following the U.S. Fish and Wildlife methods, and an identification of the standard King County buffer width required for these wetlands. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsite -PFOE 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated fAnUlated *connotes weUand continues off-site PFOE palustrine, emergent. seasonally flooded PSSC palustrine, shrub-scrub, seasonally flooded/saturated The U.S. Army Corps of Engineers and King County, as well as a number of other local, state, and federal agencies, regulate activities in and around identified wetland and drainage corridor areas. Such regulations focus on the avoidance of adverse impacts to wetlands, streams, associated buffers and the mitigation of such impacts that cannot be avoided. King County has established criteria to categorize wetlands for purposes of regulation and the establishment of buffers. In addition, King County allows a limited amount of alterations to wetlands (i.e. isolated wetlands, roadway crossings) provided such impacts are mitigated pursuant to an approved mitigation plan. The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. • I 11 TABLE OF CONTENTS INTRODUCTION ............................................................................................................. 1 STUDY PURPOSE ......................................................................................................... 1 SITE DESCRIPTION ..................................................................................................... I BACKGROUND INFORMA.TION ................................................................................. 2 NATIONAL WETLAND INVENTORY MAPPING .................................................... 2 STATE OF WASHINGTON PRIORITY HABITATS AND SPECIES ....................... 2 STATE OF WASHINGTON STREAM CATALOG ..................................................... 2 KING COUNTY SENSITNE AREAS MAPPING ....................................................... 2 SOILS MAPPING .......................................................................................................... 2 ONSITE EVALUATION -WETLANDS ....................................................................... 3 WETLAND STUDY METHODS .................................................................................. 3 FIELD OBSERVATION ................................................................................................ 4 WETLAND AND STREAM DETERMIN"ATION ........................................................ 6 WETLAND FUNCTION AND V ALOE ASSESSMENT ............................................. 7 ONSITE WETLAND VALUATION ............................................................................. 8 REGULA TORY CONSIDERA.TION ............................................................ " ............... 10 U.S. ARMY CORPS OF ENGINEERS -SECTION 404 ............................................... 10 STA TE OF WASHINGTON DEPARTMENT OF ECOLOGY .................................. 11 KING COUNTY -"ENVIRONMENTALLY SENSITIVE AREAS" ORDINANCE 21A.24 ...... 11 SELECTED ACTION PLAN ........................................................................................ 13 FIGURES ......................................................................................................................... 14 REFERENCE LIST ........................................................................................................ 15 APPENDIX A ...................................................................................................... .-........... 16 A TI ACIIMENT 1 .......................................................................................................... 17 ', •. Ill BACKGROUND INFORMATION STANDARD OF CARE Prior to extensive site planning, this document should be reviewed and the wetland boundaries verified by the appropriate resource and permitting agencies. Wetland boundaries, wetland classifications, wetland ratings, and all proposed wetland restoration and enhancement activities must be reviewed and approved by King County and potentially other regulatory staff. The above consultants have provided professional services that are in accordance with the degree of care and skill generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. The consultant is not responsible for design costs incurred before this document is approved by the appropriate resource and permitting agencies. Mark Heckert H & S Consulting INTRODUCTION This _ report details the culmination of activities and onsite evaluations undertaken to complete both a wetlands evaluation and a wildlife habitats assessment as an element of the planning and site development of the Soos Creek Plat Project Site. The project area is approximately 7.26 acres in total size and generally located within a quickly urbanizing area east of the City of Renton, King County, Washington (Figure 1). The evaluation and delineation of onsite and adjacent wetlands and drainage corridors is a vital element in the planning and selection of a site development action. The goal of this approach is to assure that planned site platting does not result in adverse environmental impacts to such areas. Wetlands are generally defined as ''those areas of King County that are inundated or saturated by ground or surface water at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions." (King County Environmentally Sensitive Areas). STUDY PURPOSE This purpose of this document is to present the results of the onsite assessment and evaluation of the wetland/drainage corridor areas and the wildlife habitats within the project area. Included within this report is an assessment of the proposed impacts and compensatory actions to be taken to ensure that proposed onsite actions do not adversely impact environmentally sensitive areas. This study was designed to accommodate site planning and potential regulatory actions. This report is suitable for submittal to federal, state, and local authorities for wetland boundary verification and permitting actions. SITE DESCRIPTION The project site is comprised of three parcels; ( Parcel # 6199000220, 6199000240, 6199000260). The project site is dominated by mature and sub-mature forest, with a single-family residence, managed and maintained lawns, and unmanaged portions. The forested portion of the site is dominated by a mixed forested plant community of mature Douglas fir (Pseudotsuga menziesil) and mature big leaf maple (Acer macrophyl/um). The project site is generally sloping to the east. There is a constructed ditch along the northwestern boundary of the site, to convey surface water from an adjacent development east down the slope. There is no evidence onsite of a continuous stream channel other than the ditch. 031103 Boston 12411 Ave. SE -1 BACKGROUND INFORMATION NATIONAL WETLAND INVENTORY MAPPING The National Wetland Inventory (NWI) mapping completed by the U.S. Fish and Wildlife . Service was reviewed as a part of this assessment. This mapping resource did not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as palustrine, forested, seasonally flooded (PFOC) Palustrine, Scrub- Shrub, Seasonally Flooded (PSSC), and palustrine, emergent, seasonally flooded (PEMC) (Figure 2). STATE OF WASHINGTON PRIORITY HABITATS AND SPECIES The State of Washington Priority Habitats and Species (PHS) Mapping was reviewed as a part of this assessment. This mapping resource identified Big Soos Creek within the immediate vicinity. STATE OF WASHINGTON STREAM CATALOG The State of Washington Stream Catalog for Puget Sound was reviewed as a part of this assessment. This mapping resource did not identify any streams within the project site. Offsite, adjacent to the east, a stream corridor was identified as Big Soos Creek. This creek was identified to provide habitat for resident and anadromous fish species. KING COUNTY SENSITIVE AREAS MAPPING The King County Wetland Inventory was reviewed as a part of this assessment. This mapping resource did . not identify any wetlands on the project site. This resource identified a wetland immediately off-site to the east as Map Folio Wetland 5402, Class 1 (C), 134 acres. This resource also identified Big Soos Creek transecting the wetland as a Class 2S stream. SOILS MAPPING A review of the mapping of soil types within the project area completed by the U.S. Soils Conservation Service (SCS) identified that the onsite soils consist primarily of Alderwood gravelly sandy loam (Soils Survey of King County Araa Washington, Nov. 1973). This soil is described as: AgC -Alderwood gravelly sandy loam: This series consists of moderately well drained soils that have a weakly consolidated to strongly consolidated substratum at a depth of 24 to 40 inches. This soil is on uplands and formed in glacial deposits. A typical pedon of Alderwood soils from O -12 inches is dark brown (10YR 4/3) gravelly sandy loam. From 12 to 27 inches the soil is 031103 Boston 12411 Ave. SE -2 Wetland Report grayish-brown (2.5YR 5/2) gravelly sandy loam with many medium, distinct mottles. This soil series is not listed as a hydric soil. ONSITE EVALUATION -WETLANDS WETLAND STUDY METHODS Presently accepted wetland identification is based on a three parameter criteria test as established within both the Corps of Engineers Wetlands Delineation Manual (1987 Manual) and the Washington State Wetlands Identification and Delineation Manual (Wash. Manual). These criteria are: 1. A predominance of hydrophytic vege!,ation. 2. The presence of hydric soils, and ' 3. The presence of wetland hydrology. Initial onsite assessment and evaluation was completed during several site visits in 2003 and 2004. Specific identification of wetland boundaries was completed on December 17, 2003. Assessment transects were established on a north/south pattern through the project area. Wetland assessment within the project site followed the methods and procedures outlined in both the Wash. Manual and the 1987 Manual. Onsite assessment noted that there were no differences in the identified wetland boundaries as a result to using either the Wash. Manual or the 1987 Manual. Drainage corridors were assessed and identified in accordance with the criteria established by King County and the State of Washington Department of Natural Resources (WDNR} Forest Practice Rules c,NAC 222-16-030). The site characteristics were assessed on April 2, 2004 with King county staff (N. Gillen) to confirm wetland categorization and discuss mitigation options. The boundary between wetland and non-wetland areas was established by examining the transitional gradient between wetland criteria along transects through the site. Delineation was performed using the routine methodology for areas greater than five acres as detailed in the 1987 Manual. Field data sheets are provided in Appendix A. Identified boundaries were marked in the field with number flagging. These boundaries were then surveyed and made a part of the site plan mapping. 031103Boston 124"Ave. SE-3 Welland Report FIELD OBSERVATION • Vegetation The dominant onsite species was Douglas fir and big leaf maple. These mature trees formed open stands across the treed portion of the site. Additional tree species occurring onsite included Western red cedar (Thuja plicata), Western hemlock (Tsuga heterophylla), red alder (A/nus rubra), black cottonwood (Popu/us trichocarpa), cherry (Prunus spp), and cascara (Rhamnus purshiana). The understory included a wide variety of shrubs and herb species including· vine maple (Acer circinatum), salal (Gaultheria shallon), Oregon grape (Barberis spp.), hazelnut (Cory/us comuta), salmonberry (Rubus spectabilis), Scot's broom (Cytisus scopaniJs), Himalayan blackberry (Rubus procera), evergreen blackberry (Rubus /aciniatus), Pacific red elderberry (Sambusus racemosa), snowberry (Symphoricarpus a/bus), bracken fern (Pleridium aqui/ium), and sword fern (Po/ystichum munitum). Throughout the project site this plant community had been altered by prior management actions. This plant community was identified as non-hydrophytic (i.e. typical of non-wetlands). In the northwestern portion of the site, at the northwest corner, ·an isolated depression occurs. The plant community in this area is shrub-scrub, dominated by salmonberry, spiraea (Spiraea douglasit), slough sedge (Carex obnupta), buttercup (Ranuncu/us repens), reed canarygrass (Phalaris arundinacea). softrush, and lady fern (Athyrium filix-femina), with alder (A/nus rubra) saplings occurring intermittently. . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). Offsite to the east a large stream corridor occurs. The plant community in this area is shrub-scrub, dominated by red-osier dogwood (Comus stolonifera), spiraea (Spiraea doug/asit), salmonberry, Sitka willow (Salix sitchensis), slough sedge (Carex obnupta), buttercup (Ranuncu/us repens), and willow-weed (Polygonum /apathifolium). . This plant association was identified as hydrophytic in character (i.e. typical of wetlands). • Soils As identified by numerous sample plots throughout the project site, . the majority of the site exhibited a soil profile typical of the Alderwood soil series. The soil w~s defined as gravelly sandy loam with a soil matrix color of dark brown (10YR 3/3) to brown (10YR 4/4). These soils did not exhibit redoximorphic features such as prominent soil mottles, oxidized root channels, or glayed soil layers within the first 20 inches of soil depth. The majority of the project site exhibited soil which would not be considered "hydric." Representative sample plots are identified. (Special note -many more sample plots were completed during the field assessment than are reported within Appendix A). Sample plots within the defined isolated depression exhibited a mixed gravelly loam soil texture. These soils appeared to be mineral in character. Soils ranged in color from very dark brown (10YR 3/1) to dark grayish brown (10YR 4/2). Redoximorphic features 031103 Boston 124" Ave. SE. 4 Wetland Report were present and often very prominent. Soils within these areas exhibited "hydric" characteristics. • Hydrology Onsite hydrology appeared to be the result of seasonal stormwater runoff from onsite and adjacent properties. In addition, the pattern of surface water movement appeared to have been modified by prior land use activities. These activities have included the development of offsite homesites, the development of roadways and utilities, and the placement of culverts. The general movement of surface water runoff across the site was generally to the east. Surface water through the site was captured in boundary and roadside ditches which occur at the north and south boundaries of the site. Within the isolated depression, evidence of seasonal soil saturation was documented. This area was in a small depression, and had been impacted by prior land use actions (i.e. grazing, compaction, pasture management). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. This depression apparently drained to the ditch which flows east along the northern boundary of the site. Within the stream corridor area located offsite to the east of the site evidence of seasonal soil saturation was also documented. This area was part of a large wetland complex, and had been impacted by prior and on-going land use actions (i.e. utility corridor development). Based on field indicators (i.e. water stained leaves, drift lines, soil saturation, oxidized root channels, wetland drainage pattern) this depression met the wetland hydrology criteria of the 1987 Manual and the Wash. Manual. 031103 Boston 124" Ave. SE· 5 WeUand Report WETLAND AND STREAM DETERMINATION Wetland determination was based on sample plots which contained hydrophytic vegetation, hydric soils, and wetland hydrology in accordance with the 1987 Manual and the Wash. Manual. Based on these methods two wetland areas were identified onsite (Attachment 1). No area was identified onsite to exhibit characters typical of a ·stream" (i.e. a continuous pattern of surface water movement, either permanent or intermittent). Also one ar~a. noted to have been intentionally created in an upland area, captured residential runoff. WETLAND SIZE CLASSIFICATION KING FUNCTION STANDARD ONSITE (USFWS) COUNTY AND VALUE BUFFER WIDTH (square RATING RATING feet) A Offsite -PFOE 1 High 100 ft. Buffer onsite B *998 PSSC 3 non-Low Not regulated reaulated •connotes wetland continues off-site PFOE palustrine, emergent, seasonally flooded PSSC palustrine, shrub-scrub, seasonally flooded/saturated Wetland A: This wetland was identified within a large wetland/stream complex off-site to the east of the project site. This wetlciind was dominated by a shrub -scrub plant community adjacent to the project site, and was forested further away from the site. This plant community was managed apparently to maintain the utility corridor access and maintenance road. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of topography. Wetland A was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as palustrine, shrub-scrub, seasonally flooded/saturated (PSSE). Based on the size of the wetland, association with a Class 2(S) stream, and the forested plant community this wetland complex was identified to meet the criteria for designation as a King County Class 1 Wetland. The standard buffer for a Class 1 Wetland is 100 ft. as measured perpendicular to the wetland edge. Wetland B: This wetland was identified within an isolated depression in the northwest comer of the project site. This wetland was dominated by a shrub-scrub plant community. This wetland was hydrologically supported by road and roof runoff conveyed by a ditch from an off-site single-family residence. This wetland exhibited shallow ponded surface water during the winter and early growing season as a result of · topography and roof runoff. Wetland B was identified to meet the U.S. Fish and Wildlife Service (USFWS) criteria for classification as palustrine, scrub-shrub, seasonally flooded/saturated (PSSE). Based on the size of th1:1 w1:1tland and the shrub-scrub plant community this wetland was 031103 Boston 12411 Ave. SE -6 Wetland Report I identified to meet the criteria for designation as a King County Class 3 Wetland. However, since this wetland is smaller than 2,500 sq. ft. in total size, this wetland is apparently not regulated by King County. WETLAND FUNCTION AND VALUE ASSESSMENT Wetlands are known to perform significant roles in the ecosystem, some of which are of immediate value to society. These roles vary greatly with the size, type, hydrology, vegetation, and location of wetland areas. Although the ecological functions performed by this wetland are complex, interrelated, and difficult to assess and quantify, methods have been developed for the U.S. Army Corps of Engineers (Adamus et al. 1987: Reppert et al. 1979). The functions provided by wetlands include hydrologic support, shoreline protection, stormwater and floodwater storage, water quality, groundwater recharge, and provision of wildlife habitat. The HYDROLOGIC SUPPORT FUNCTION is defined by the measure of hydrologic stability and environmental integrity which the wetland provides. This function is measured by the frequency of inundation and saturation by tidal actions, stream flow, runoff, and precipitation. Wetlands permanently inundated or saturated, or intertidal wetlands are valued as high. Medium valued wetlands are seasonally flooded or are open water systems that remain saturated during most of the growing season. Wetlands that are intermittently flooded or hydrologically is.elated are considered of low value. The SHORELINE PROTECTION FUNCTION is defined by the measure of shielding from wave action, erosion, or storm damage which a wetland provides. This function is measured by the location and width of the wetland along shoreline areas, types of vegetation present, and the extent of development along the shoreline. A high value is given to wetlands along a shoreline that have a width greater than 200 yards and dense woody vegetation. A medium value is given to a wetland with a width of 100 to 200 yards, sparse woody vegetation, and dense emergent vegetation. Wetlands less than 100 yards in width and emergent or lacking vegetation are considered of low value. The STORMWATER AND FLOODWATER STORAGE FUNCTION is defined by the ability of a wetland to store water and retard flow during periods of flood or storm discharge. Wetlands of larger size are generally considered to have greater ability to provide this function. In addition, wetlands nearer to urban or potentially develop-able areas are also considered to provide greater flood protections than wetlands which are in undeveloped areas. The WATER QUALITY FUNCTION is defined by the physical, biological, and chemical processes which wetlands provide to naturally purify water. This function removes organic and mineral particulates through natural filtration. In general, wetlands of greater size, more demie veget1:1tion, and those which are 031103 Boston 12411 Ave. SE· 7 Welland Report close to point sources of pollution are considered to be of higher value. Wetlands which are small (<5 acres), lacking dense vegetation, and not close to point or non-point sources of pollution are considered of low value. The GROUNDWATER RECHARGE FUNCTION is defined by the interaction of the underlying geology and soils, and the surface topography. This function provides for the movement of surface water into groundwater systems. Important to this function is wetland size, period of inundation, and depth of standing water within the wetland. High value is given to permanently inundated wetlands greater than 10 acres in size. Medium value is given to wetlands which are seasonally flooded and 5 to 10 acres is size. Wetlands less than 5 acres in size, isolated, and temporarily saturated are considered of low value. The NATURAL BIOLOGICAL FUNCTION is defined by the complexity of physical habitats and biological species within the wetland area. The value given to a wetland depends upon its ability to provide habitat for nesting (spawning), incubation, feeding, rearing, and cover of aquatic and terrestrial animal and fish species. In addition, the ability of a wetland to provide support for varying food chains is an important element in value assessment. Wetlands of high species diversity, three or more habitat JYpes, unique habitat features, large in size, and associated with a permanent stream or tidal marsh are considered of high value. Wetlands with moderate species diversity, two habitat types, moderate in size, and associated with an intermittent stream or high salt marsh are considered of medium value. A low value is given to wetlands of low species diversity, small size, and isolated. · These six functions are rated low, moderate, or high, based on the criteria outlined above. These criteria are guidelines compiled from Adamus (1987) and Reppert (1979) and professional judgment must be exercised in assessing these criteria. Overall values for a wetland are assigned, based on a synthesis of individual values. In addition to intrinsic functions, extrinsic functions are also recognized. These extrinsic functions provide social values that have indirect benefits to wetlands. Education and recreational opportunities are most often mentioned as extrinsic functions. Associated values are often subjective and are thus difficult to evaluate. As such, these functions are not rated, but are nonetheless important when considering creation, restoration, or enhancement projects. ONSITE AND OFFSITE WETLAND VALUATION Following the function and value assessment process noted above Wetland A (Located offsite) was rated as exhibiting a High rating: • Water Quality Benefits -This wetland was part of a large complex associated with Big Soos Creek. This complex had been impacted by prior and on-going utility corridor land management. This wetland appeared to retain more than 50% of the runoff which occurred within the local area. This 031103 Boston 12411 Ave. SE-8 Wedand Report , .. wetland also exhibited a wide vegetation diversity. The primary water quality benefit provided by This wetland was a significant amount of biofiltration of surface stormwater. • Stormwater Storage -This wetland are part of a large wetland complex and had been impacted by prior land uses. These wetland was located in a rapidly developing part of King County. This wetland was large exhibited a substantial capacity to store storrnwater. • Hydrologic Support -This wetland appeared large, and noted to pond a substantial amount of surface water throughout the growing season. Evidence of seasonal ponding.and saturation to the surface was significant. • Groundwater Recharge -This wetland appeared large, and to pond a significant amount of surface water throughout the growing season. Evidence of seasonal ponding and saturation to the surface was substantial. • Natural Biological Function -This wetland was large, and exhibited an extensive range of plant diversity and vegetation complexity. Unique habitat features (i.e. snags, falll;jn trees, mature trees along the wetland boundary) were limited adjacent to the project site. Following the function and value assessment process noted above Wetland 8 were rated as exhibiting a low rating: • Water Quality Benefits -This wetland was small and had been impacted by prior grazing and pasture and land management. This wetland appeared to retain less than 25% of the runoff which occurred within the local area. This wetland also exhibited a limited vegetation diversity as a result of prior grazing and land use. The primary water quality benefit provided by This wetland was a very limited amount of biofiltration of surface storrnwater. • Stormwater Storage -This wetland appeared within a topographic depression and had been impacted by prior land uses. T_his wetland was located in a rapidly developing part of King County. This wetland was small and exhibited a very limited ability to store storrnwater. • Hydrologic Support -This wetland appeared small, and noted to pond a limited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surface was limited. • Groundwater Recharge -This wetland appeared small, and to pond a limited amount of surface water early in the growing season. Evidence of seasonal ponding and saturation to the surface was limited. 031103 Boston 124" Ave. SE. 9 Wetland Report r-, • Natural Biological Function -This wetland was small, and exhibited a very limited range of plant diversity and vegetation complexity. Unique habitat features (i.e. snags, fallen trees, mature trees along the wetland boundary) were absent. · REGULATORY CONSIDERATION The proposed alteration of lands defined by various federal, state, and local authority rules and regulations as ''wetlands" raises environmental concerns that are generally addressed in the development review process. These concerns center around the development's potential adverse impacts to the structure, function, value, and size of these "wetland" areas. Such adverse impacts may include a reduction in wildlife habitats, reduced surface water quality, reduced water retention, a reduced ground water recharge rate, reduced plant species diversity, and the. reduction in the function and value of other associated wetland and non-wetland characteristics. U.S. ARMY CORPS OF ENGINEERS -Section 404 Section 404 of the Clean Water Act (33 U.S.C. 1344) prohibits the discharge of dredged or fill material into "Waters of the United States" without a permit from the Corps of Engineers (Corps). The Corps has jurisdiction over freshwater systems waterward from the ordinary high water line of a water body or waterward from the upland boundary of the adjacent wetland. The definition of fill materials includes the replacement of aquatic areas with dry land, grading which changes the surface contour of a wetland, and mechanized land clearing in wetlands. For the purposes of Section 404 permitting the Corps makes the final determination as to whether an area meets the wetland definition and would be subject to regulation under the Corps program. Currently the Corps has two specific types of permits which apply to wetland fill proposals. These two types are a series of specific Nationwide Permits and the Individual Permit The Nationwide Permit process identifies specific categories of work that can be undertaken following a set of specific conditions applicable to each Nationwide Permit number. For example; NWP#12 allows for the limited, short term impacts to wetlands for the placement of utilities, and NWP#14 allows for a limited impact to wetlands as a part of the development of a roadway crossing. The Corps has noted several times within information papers, documents, and workshops that a project proponent that places fill within a wetland without specific Corps authorization does so at the proponent's own risk. The Corps requires an Individual Permit where a proposed activities within an identified jurisdictional wetland area can not be authorized under one of the Nationwide Permits. Within the Individual Permit process the Corps undertakes a much more in- depth review of the proposed project and the proposed impacts. The Corps must evaluate whether the benefits derived from the project outweigh the foreseeable environmental impacts of the project's completion. 031103 Boston 124" Ave. SE-10 Wetland Report J STATE OF WASHINGTON DEPARTMENT OF ECOLOGY Proposed action undertaken through either of the Corps of Engineers processes (Nationwide, Individual, or isolated) are also subject to the provisions of the Washington State Department of Ecology Water Quality Certification Process. Projects that may be exempt from Corps of Engineers Section 404 jurisdiction may still require review by the Washington State Department of Ecology to ensure consistency with State water quality protection provisions. KING COUNTY -"Environmentally Sensitive Areas" Ordinance 21A.24 • Wetland and Stream Classes King County regulates activities in and around wetland areas. Such regulations also require that an undisturbed native vegetation buffer be retained along the upland side of the identified wetland areas. To assist in this regulation the County has defined classes by which to regulate wetlands, streams, and their associated buffer area. These categories are based on such features as size; the presence of endangered or threatened plants, fish, Qr animals; regionally rare wetlands; wetlands of local significance for wildlife or stormwater functions; the number of wetland classes and subclasses; and percentage of open water. A Class 1 Wetland means a wetland assigned the Unique/Outstanding rating in the King County Wetlands Inventory, or any wetland which meets any of the following criteria: 1. The presence of species listed by the federal government or state as endangered, or threatened, or the presence of critical or outstanding actual habitat for those species; 2. Wetlands having 40% to 60% permanent open water in dispersed patches with two or more classes of vegetation; 3. Wetlands equal to or greater than ten acres in size and having three or more wetland classes, one of which is open water; or 4. The presence of plant associations of infrequent occurrence. A Class 2 Wetland means a wetland assigned the Significant #2 Rating in the King County Wetlands Inventory; or any wetlands which meet any of the following criteria: 1. Wetlands greater that one acre in size; 2. Wetlands equal to or less that one acre in size and having three or more wetland classes; 3. Wetlands equal to or less than one acre that have a forested wetland class; 4. The presence of heron rookeries or raptor nesting trees. 031103 Boston 124" Ave. SE -11 Wetland Report I A Class 3 Wetland means a wetland assigned a Lesser Concern #3 Rating in the King County Wetlands Inventory, 1983, or uninventoried wetlands that area equal to or less than one acre in size and that have two or fewer wetland classes. King County does not regulate wetlands less than 2,500 square feet in total size within the Urban Growth Boundary of King County. King county defines "Streams· as those areas in King County where surface waters produce a defined channel or bed, not including irrigation ditches, canals, storm or surface water run-off devices or other entirely artificial watercourses, unless they are used by salmonids or are used to convey streams naturally occurring prior to construction in such watercourses. • Required Buffers King County has established a standard buffer to be applied to a wetland or stream to assure protection of the wetland function and value. This buffer area is measured perpendicular to the defined wetland edge or perpendicular to the identified ordinary high water mark of a stream. WETLAND STANDARD BUFFER ~·CLASS WIDTH 1 100 feet 2 50 feet 3 25feet King County allows the standard buffer to be modified where such actions would provide additional protection to wetlands or enhance the wetland's functions (21A.24.320.B). Buffer averaging may be allowed as long as the total area contained in the buffer on the development proposal site does not decrease and the minimum width of the final buffer is not less than 65% of the standard buffer width. 031103 Boston 12411 Ave. SE-12 WeUand Report SELECTED ACTION PLAN The Selected Action Plan of the Soos Creek Plat project site focuses on the creation of independent lots suitable for the development of single-family homesites consistent with the King County Comprehensive Plan. A primary feature in the creation of these homesite lots will be the establishment of a protective buffer adjacent to the identified offsite wetland consistent with the King County Environmental Sensitive Areas Ordinance. Wetland B will be filled in accordance with King County regulation. Preliminary development and mitigation plans are submitted by the Owner (Boston Design & Development) as an attachment to this report. 031103 Boston 124"' Ave. SE -13 Wetland Report , I ,J I I ; J FIGURES 031103 Boston 124~ Ave. SE -14 WeUand Report n <!J,,13 OJ01 03!. 031J O~JO or40 0~80 Olll 01.:W II 0223 r·-0,01 <l,'()l 0023 021.ts = 0204 022· O'W O.u.2 0200 QO.i!1 ""'" II 0241 024!) .. O.l44 0242 '° ex,,., ~, """° .. II viao i Ot~ Ot.U p 0,2!, ()JOO 01"1' 0~42 o~~ 0210 0.-140 II Ol20 o~o o,a~ o,os 0220 O'tw itti-3 0241 II 01ti0 (.'l,,11 0340 OtW ;; 021s 0161 l"az H:_11.ZND_S; '4 wrn -11 Ill, OO'ti = II Cl0/0 1 + oo,s OO!iO 0110 -,1 oosa aoss ..<:<,<; jC)-1'ai C.."'r I -11 1 Legend -11 ;t/ Salacted Feiltures C,""1 ;,/ St.l8at1i Ct.'111/S,2.>t:rcn,.a Pa1<8l ;t/ Ci.-. 2S:1111<1ld -11 ;t/ Fioh and Oilcil ;,/ C1&1'. l Wildlile Nalwo ... ... ..irs:i.-.icd SAO Straam ID SAO W..Uand -11 •:l:.W't: It. ~fl&~ ;/,.... Lonsulting O'O' 0~ <X.•U (X."tl 00<1' 00<10 004S oo~o .. ., t .. : 0024 ~! .. p """" 902~ ,.,,. ,.,,. 0 N w Figure 1. Site Vicinity And King County Wetlands Map E Soos Creek Plat • • • .49.a. . ', ,. \ ' • • • • • at ···-,, • • 0.06 i""\,I Rent~n nwi 'lenton nw1 PEMC • PEMF PFOC w '.=] PSSC • • • • 0 N s 0.06 E PUB~ 0.12 MIies Figure 2. Soos Creek Plat NWI Map I REFERENCE LIST Adamus, P.R., E.J. Clairain Jr., R.D. Smith, and R.E. Young. 1987. Wetland Evaluation Technique (WET); Volume II: Methodology, Operational Draft Technical Report Y-87, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Mississippi. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. Office of Biological Services, U.S. Fish and Wildlife Service, U.S. Department of the Interior, FWS/OBS-79/31. Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1, US army Engineer Waterways Experiment Station, Vicksburg, Miss. · · Hitchcock, C.L., A Cronquist. 1977. Flora of the Pacific Northwest. University of Washington Press. Seattle, Washington. Homer, R.R. and K.J. Raedeke. 1989. Guide for Wetland Mitigation Project Monitoring. Washington State Department of Transportation. contract number GC8286, task 6. King County Department of Natural Resources. 1993. DRAFT Wildlife Management in King County: Issue Paper. Mikol, S.A. 1980. Field Guidelines for Using Transects to Sample Nongame Bird Populations. U.S. Fish and Wildlife Service publication FWS/OBS -80/58. Reppert, R.T., W. Sigleo, E. Stakhiv, L. Messman, and C. Meyers. 1979. Wetland Values -Concepts and Methods for Wetland Evaluation. Research Report 79-R1, U.S. Army Corps of Engineers, Institute for Water Resources, Fort Belvoir, Virginia. U.S. Department of Agriculture, Soils Conservation Service. Soils Survey of King County Area Washington, Nov. 1973. Washington State Department of Ecology. 1997. Washington State Wetlands Identification and Delineation Manual. Publication Number 96-94. Washington State Department of Fisheries, Catalog of Washington Streams and Salmon Utilization, Volume 1., 1975 031103 Boston 124" Ave. SE -15 Wetiand Report APPENDIX A FIELD DATA FORMS 031103 Boston 12411 Ave. SE -16 WeUand Report Data Form Routine Wetland Determination Project/Sile: Boston 124111 Ave. SE Job Number: 031103 City: none Wetland Data Point SP 1 Applicant/Owner: Boston o.t111n & Development Co. lnvestigalof: M. Heckert Date: December 17, 2003 County: King State: Wa [XI Do normal drcumalanc:ea exist on the alte? [ J Have vegetalion, soila, or hydroJogy been disturbed? Community ID: Folfft Station ID: ( J Is the area a polantial problem area? Vegetation Dominant Species Common Name Plot ID: % Covar Indicator Hl'ilFIPYI X Pha/atia arund/nacea Grasa,Reed c,nery 50 FAC:W ~ Oemletia ceraimonnis Indian Plum 25 FACU X Rubua snnenlaaus Blackberry.Himalaya 50 FACU Im X A/nus n,bra Aldar Re<I 66 FAC % Species that ara OBL. FACW, or FAC(except FAc.C-~)-: --!50~"""""------~c~aw~a"'rd~in~C~la~sal=ficatl=o,..cn"': '------'-""'--- Ramllrks appears to drain weu Hydrology [ J Recorded Dala (dele:ribe In remarks) [ I Stream, Lake, or Tide Gage [ I Aenal Photograph I I Other (deSc:ribe In remarks) Field Oblet'tations: Depth of Surface Water(in.): o Depth to Free Water In Pit(ln.): >24 Depth to Saturated Soils(in.): >24 Remarks appears to drain well Soils Primary Welland HyrJtoiogy lnd/calOni I ) Inundated [ J Satureted In upper 12 inohes [ J Water marks [ I Drift Ul18ll I J Sediment depOaits [ J Orainege patterns in weUand1 Mottle / 2nd Mottle SBc:ondary HyrJto/o(/y Indicators [ ) Oxldlzed root c11,nnels [ ) Water-ttained IHvee [ J Local soil sun,ey dala [ I FAc-Neutral test [ I Other (explain In ren1arl<s) Depth Hor. !in.) Matrix Color 10YR 312 10YR3/3 color Abundanos contrast Te>ture, SIIUcture, etc. 0-6 A &-18 B Hydric Soila Indicators [ I Hlstoaol [ I Histic Epipedon [ I Sulfidic Odor I I Probab1e Aquatic Moist Regime [ I Reducing Conditions [ J Gleyed or Law.Chroma Colors UnttName: Drainage Clasa: Remarks appears to drain well Wetland Determination [ J Hydrophytic Vegelation Present [ J Hydric Soila Present [ J Wetland Hydrology Preaent Remart<t fill wedand criteria NOT met appears to drain well [ I Concretions Coarse Sendy Loam stones Coarse Sandy Loam stones [ ) High Organic % in Surfaos Layer [ J Organic Streaking [ J Listed on Local Hydric Soils List [ J Llated on National Hydric Soila Ust [ J Other (explain in remaru) Taxonomy: [ J Field ObservaUons matcll map [ J This Data Point is a Wetland Paae 1 of 10 Datafonn Routine Wetland Detennlnatlon Projec:1/Slte: ao.ton 1241h Ave, SE Applicant/Owner: Boeton Design & Development Co. lnY8Stlgator: II. Hec:kert [XI Do nonnal c:lrcumstancet oxill on the Ille? [ I Have vegetation, aoils, or hydrology been disturbed? [ I II the area • potanlilll problem area? Vegetation Job Number. 031103 City: none weuand Oat.a Point SP 2 Date: December 17, 2003 County: King State: Wa Convnunlty Ill Station ID: Plot ID: Dominant SPfClp Common Name % Co¥« Indicator tttaw,eu, X Pf1afliti& arundinllCII& Grus.Reed Canary 90 FACW lluJla X Rubus sp«:tabllis Beny,Selmon 25 FAC X Spiraea doug/asH Spltaea,Douglas' 25 FACW % Speciea that are OBL, FACW, or FAC(except FAC.): 100 Remarka Cowardin Classification: peu appears to drain poorly Hydrology ! I RacoRled Oat.a (de&Cribe 1n 1811111ka) ! I Strum, Lake, or Tide Gage ! I Aenal Photograph [ I Other (describe in 191111rka) Field Obeervalions: Depth of Surfac:e Wate,(in.): o Depth to Free Weter In Pll(in.): 12 Depth to Seturated Soile(in.): 12 Ramarka appears to drain poorly Solla Primary Wetland Hydrology Indicators [ I Inundated [XI Saturated In upper 12 inches [XI Water merka ! I Drift lines [X) Sediment deposits [ ) Drainage pattems In wetlands Mottle I 2nd Mottle Secondary Hyd/0/o(ly lndicalrJrs [XI Oxldized root channels [ I Weter .. talned luveS ! I Loc:al ao11 IWV8)' data [ I F~utral INt [ I Other (explain In remarka) Depth Hor. /In.) Matrix Color 10YR 312 10YR3/3 COior Abundance contrast TllCIUre. Struaure, etc. o-6 A 6-18 8 HydttC Soils Indicators [ I Histosol [ I Hlatlc Eplpeclon ! I Sulfidic Odor 10YR6/6 [XI PRlballfe Aquatic Moilt Regime [XI Reducing Condiliona [X) Gleyed or Low-Chioma Colors Unit Name: Drainage ClasS: Ramarka 1ppea111 to drain poo,1y Wetland Detennlnatlon [XI Hydrophytic Vegetation Present [XI Hydrlc Solla Present [XI Welland Hydtology PreNnt Ramarb fill wetland cr11erla MET appea111 to drain poorly wlA A1 toA22 common distinct [XI Concretions Coarae Sandy Loem cobbles Coarae Sandy Loem stones [ J High Oraanic % In Surface Layer [XI Oraanic Streaking [ I L.ill8d on Local Hydrlc Soila LIit [ ) LIited on National Hydrlc Soila List I I Other (explain In remarka) Taxonomy: [ I Field Observations match map [XI This Dall Point is a Wetland Paae 2 of 10 Data Fonn Routine Wetland Detennination Project/Site: Boaton 1211th Ave. SE Job Number: 031103 City: none Wetland Data Point SP 3 Applicant/Owner: Boaton Dellgn a. Development Co. ln-tlgator: M. Heckelt Date: December 17, 2003 County: King State: Wa [XI Do nonnal circum,tances ltldat on the lite? [ I Have vegetation, soils, or hydrology been disturbed? [ ] la the area a potential problem area? Community ID: Palustrlan 1hn,b' Station ID: Plot ID: Vegetation Dominant s,,,c,,. Common Name NldMGIPHI X Phaiaris arunanacea Grau.Reed Canary 90 FACW ~ Salix sitchensis Willow.Sitka 70 FACW % Species that are OBL. FACW, or FAC(except FAC-): 100 Remllfkl Cowardln Claulfication: PNG appears to draln pootly Hydrology [ I Recorded Data (deaa'lbe in remarks) [ I 5-n. Lake, or Tide Gage I I Aerial Photograph [ I Other (desc:rille in remarks) Field Observations: Depth of Surface Water(ln.): O Depth to FIN Water In Pil(in.J: 8 Depth to Saturated Solla(ln.): 6 Remarks appears to drain pootly Solla PrlmBry Wetland Hyc/tology lndicalOl'S [ ] Inundated [X) Saturated in upper 12 lnche$ [ I Water marks [ I Drill Unes [XI Sediment depolits [XI Drainage pattema in wetiandl Mottle I 2nd Mottle SecondetY Hyat,/ogy Indicators [XI Oxidized root chaM\111 [X]Watar-atainecl IHvea I I Local IOll survey c1ata [ I FAc-Nautral test [ I Other (explain in remaiks) . Depth Hor. (In.) Matrix Color color Abundance coniiasl Texture, Structure, etc. Cl-6 A 6-18 A/B 10YR 311 10YR'4/1 Hyanc Soi/Ji lndicalors I I Hiatosol [ I Hiatie Epipedon [ I Sullidie Odor 10YR516 [ I Probable Aquatic Moist Regime I I Reducing Conditions [ I Gleyed or Low-Chroma CoiOII UnftName: Drainage Claaa: Remarks appears to drain poorly Wetland Detennlnatlon (XI Hydrophylic Vagetation Preaent [XJ Hydric Solla P,-nt [X) Wetland Hydrology Preunt Remarks common distinct [ I Concnttione Coarse Sand)! Loam pei>blea Loamy Sand stones [ ) High Organic % in Surface Layer I I Organic Streaklng I I L.iated on Local Hydric Soils List [ I L.istad on National Hydric Solla List [ ) Other (explain In remarks) Tpanorny: [ I Fleld Observationa match map [XI Thia Data Point ia a Wetland on edge wetland cruria MET appears to drain pootly Paae3of 10 Data Fonn Routine Wetland Determination Pn:,ject/Site: bton 124«11 Ave. SE Applicant/Owner: 8-0..lgn • Development Co. ln-tigator: M. Hackert IX) Do normal cfrcumstanc:ea exiat on the alto? [ ) Have vegetation, eoll8, or hydloiogy been disturbed? [ ) la the aru a pollntial plOblem area? Vegetation Dominant spec1ea Common Name ~ Pha/sti8 arund/n,oea Grau.Reed Canary ~ Rubus atmell/acua Blackbeny,Hlmalaya X Salix hookerana WUlow,Hooker X Pooulus lrichocama Cotton-Wood. black % Species lhat 819 OBI., FACW, or FAC(except FAC-): 75 Remarkl appeatl to drain poorly Job Number: 031103 City: -Wetland Pata Point SP 4 Oat8: December 17, 2003 County. King State: Wa Community ID: Station ID: Plot ID: % Covtr lndlcalQr 80 FACN 25 FACU 6 FACN· ,4() FAC Cowardln Clalsificatton: PS&-PFO Hydrology [ J Recorded Data (deacribe In ramarkl) [ I Strum, Lake, or Tide Gage PTimaly Welland HJl(lmlogy Indicators [ ) Inundated SecorJdaiy Hyr;lrology /n(//Cators [XI Oxidized root channela ! I Aerial Photograph [ I Olher (desc.ribo In namarkl) Field Obserwtlons: Depth of Surface Watm(in.): O Depth to FIM Water In Pit(in.): 3 Depth to Saturated Solil(in.): 3 Remarkl ,ppeara to drain poorly Soils [XJ Saturated In upper 12 lnchm [XI Water marks [ J Drift Unes [ J Sediment deposits [X) Drainage pattema in wetlands ! I Water,etalned 1ea- ! J Local toil aurvey data [ ) FAC-Neutral teat ! I Other (explain 1n remarbl Depth Hor. Matrlx (In.) Color Mottle / 2nd Mollie TelCIUre, Structure. etc. Color Abundance eoiitiist IH6 MJ 10YR.u:2 10YR 516 common disttnct Coarwe Sandy Loam pebbles Hydtil: So/ls Indicators [ J Hiatosol [ J Hlltlc Epipedon [ J Sullldic Odor [XI Probable Aquatic Molal Regime [XI Reducin(I Condlttona [XI Gleyed or L-chrorna Colors Uni Name: Drainage CIUs: Remarkl appears to drain pootlY Wetland Detennlnatlon [XI Hydrophytic Vegetation PreMnt [XI Hydrlc Soils Preaent (XJ Wetland Hydrology PteMnt Remarkl wetland critarla MET appeara to drain poo~y [ I Conaetiona [ J High Olganic % In Surface I.Ayer [XI Organic S1reaking [ J Lllted on Local Hydric Solis Liat I J Lllted on Nalional Hydric Solis Liat I I Other (explain 1n ,.markl) Taxonomy: [ I Field Obaervationa match map [XJ Thia Data Point la a Wettand Paae4of10 Data Form Routine Wetland Detenninatlon Projoc:1/Site: Bollton 1241h Ave, SE AppllCanl/Owner. Bollton DNlgn & DeY91opment Co. lnveatiga!Of: II. Heckert JOb Number: 031103 City: none Welland Data Point SP 5 Date: December 17, 2003 County: King Stata: Wa [XI Do normal c:ircumatancu ulat on the alte? [ I Have vegetatioll, JOiia, or hydrology oeen disturbed? [ I 11 the aru a potential problem aru? Community ID: Palualrian ahrubl Station ID: Vegetation Dominant Spec;IN Common Name Hlfi'aogs Pha/alis anmdinacBa Grffl,Reed Canary ~ Sp/(ffadou(llasii Splraaa,Douglas' X Sa/i/l 8itcllans/s Willow,Silka X water birch Plot ID: % Co-Indicator 90 30 25 21 FACW F/>C:'N F/>C:'N % Speciea lhat an, 08L, FAC>N, or FAC(except FAC-): 75 Remarks Cowardln Clalllfication: pac: appears to drain poo~y Hydrology I I Recorded Data (describe in remarks) [ I Stream, Lake, or Tide Gage I I Aerial Photograph I I Other (dacribe in n,marks) Field OblerllationS: Depth of Surtaoe Waler(in.): 0 Doplh to Fn,e Water in Pit(in.): 8 Depth to Satural8d Soils(in. ): 8 Remarka appears to drain poorly PritrMty -land Hydrology Indicators [ I lnundal8d [XI Saturated in upper 12 Inches (XI Water marks [ l Dlitl lines I I Sediment c1epoaita [ I Drainage pattams in \Wtlands Mottle / 2nd Mottle Seconda,y Hyrlro/(J(Jy lndicalots [XI Oxidized root channels [XI Water-stained ieavea .[ I Local soil survey data [ I FAC-Nautral test I I Other (explain In remarks) Soils Depth (In.) Hor. Matrix Color color Abundance Contrast Textun,, Sttucture, etc. ().16 /W 10YR4'2 10YR S/6 common distinct Loamy Sand Hydtic So/18 Indicators I I Histosol [ ] Hiatlc Epipedon I I Sullldlc Odor I I Probable Aquatic Moist Regime [ I Reducing Conditions ( l Gleyed or Low-Chroma Colors Unit Name: Drainage ClaSs: Remarks appeara to drain poorty Wetland Detenninatlon (XI Hydroph~ Vegetation PIIIMnl [XI Hydnc Solla PrNent (XI W8tland Hydrology PIIIMnt Remarks -nd crileria MET appea,-to drain poo~ [ I Conaelions [ I High Organic % in Sulface Layer I I Organic S1reak1n11 I l Usted on Local Hydrlc Soila LIit [ I Listed on National Hydrio Soils List [ I Other (explain In remarks) Taxonomy: [ I Field Obeervaticns match map [XI This Data Point ia a WeUand PSQe 5of 10 ATTACHMENT 1 WETLAND DELINEATION MAP 031103 Boston 12411 Ave. SE· 17 Wetland Report PRE-APPLICATION REVIEW FOR SUBDIVISIONS Project Name: Sc,:,o:, G::ec:J; P\.....:1-Activity No.: Ao~~czge, Roads Evaluate neighborhood circulation and for stub streets. Identify street classifications and designate urban or rur Evaluate design standards:· horizontal curves grade intersection angle and spacing Cul-de-sac length l '2.¢. ......:).,,:_,-\ \.'.:J'-c ~ ~; e;><.1~-\ -::.o...i...e.... o. .f-St \9,"C..~ :Se\-. Tracts serving 2-6 lots and< 150 feet Evaluate frontage improvements and need for ROW dedicat~ \..!le~ '?"*'\./c... Review Non-Motorized Plan for equestrian and bike lanes -fo .-2 ~ \....::,.-\!, Evaluate sight distance requirements for all intersections and driveways. -;;;::p Evaluate suitability of off-site serving roadways: Minimwn 20 feet paving, Sufficient shoulders, hazardous intersections. Determine if sufficient public ROW serves the property. Evaluate existing or proposed half streets serving >35 lots Drainage CR #1:Evaluate sub-basins, diversions, and discharge points. CR #2:Inform applicant of requirement need for off-site analysis. CR #3:Evaluate location of R/D, bioswales, and access roads. All facilities located within separate County tracts. Evaluate upstream flows and bypass issues. SR Ul:Critical Drainage Areas SR #3:Master Drainage Plan for >100 lots and 200 acre basin SR #4:Basin Plans and Community Plan P-Suffix: f-lOl4d C.......--\:,-o\ -Le.\le\ \ / ~CJ\ '2. ~t lbL<, = fu ,w: SR #5:Wet pond requirements SR #6:Lake Management Plan SR #7:Closed Depressions SR#ll:Geotechnical analysis of Sensitive Areas Wetlands, streams, steep slopes, and associated buffers located in tracts. Evaluate requirements for Erosion Hazards (KCC 21A.24.220). Evaluate wildlife corridors or habitat issues. No~/ fl~. GAR .. ·-" ' ·t -.. _ ~ .... ' \ ~... . ,/!.. __ ...,, EN TRACTS ; :+;a;ae·,:~ • •.c ... , .-..... -.. ;~61£--~9 17 .74 ':276 75 S.P. 278113 12 ( I } . - •.=.---~"-._.... .,._ -• -··-··--·---·"---.. . -· -. _....._ ' \ w - . l ' \ I_ . I \ i ,, '; ---,! . '' "(:." - PRELIMINARY PLAT PRE-APP REVIEW ISSUES FOR SOOS CREEK 18 LOT PLAT By BOSTON DESIGN AND DEVELOPMENT October 2003 The following issues need to be addressed and the County opinion given during the pre-application meeting for this formal plat. These issues are listed in order of importance. A> WETLAND DELINEA TlON 1. Adjacent to the subject parcel is a King County parcel which contains Soos Creek wetlands # 5402. Can I use the King County 1990 Wetland delineation map to position the 100' buffer setback line? 2. Does the County agree with that delineation now or must I have a consulting firm re- verify that delineation? Preliminary soil tests show that the County delineation line is very accurate, plus I don't need to be precise because my property is about 140 to 150 feet away from it. Please determine this prior to the pre-app meeting! 3. Soos Creek Sewer manhole #384 lies in the wetland 100' buffer,about 40 feet from the actual wetland, how do I get aproval to enter to connect? B> STREETS 1. These lots will enter onto 192nd at 124 Ave SE. While 192 is at a 9% down grade, site distance is in excess of 500 feet, thus no stopping site distance issue. Per 1993 Road Standards sec 2.13, "entering" site distance does not apply, are there any other site distance entering issues? If this development is expanded in a phase two to a total of 26 lots, any other issues? 2. The existing arterials street, 124th Ave SE centers on the section line (30' each side); I have a 30' easement from my neighbor and an existing gravel road through it. Since the County owns the parcel adjacent to the east, wiH they allowlprovide/dedicate the 30' right of way on their side. 3. I propose to create a small mini park on a 20' strip of County park land (along 1241h ); will It be allowed? Would it simply be part of the right of way? The purpose is so that people could walk along the edge of the county park/wetland and view it. These 30 acres of land is administered by Parks Department as it also contains " a small 2 acre park at the northern end known as "Boulevard Lane Park". The parks department has verbally said they support this kind of improvement. 4. Per Road Standards sec 3.01 we are planning sidewalks on one side of the sub access 124th and the minor access 191st, ok?. 5. Any issues if we only put in a half street for 1241h with 20' wide paving? 6. The -street, SE 191., , wiN terminate in an 80' dia paved cul-de-uc; can the R of W diameterbereducedtoso~'lf!ei!~ v; ~ fQ) lfu OCT O 9 2003 K.C. D.D.E.S. 7. Any Issues with the private access tracts serving 6 houses each side of the cul-de-sac? 8. Are there any Street Lighting requirements, if so by what standards? C. DRAINAGE 1. We plan to widen and pave the offstte existing 124th gravel road. How does the County plan to deal with storm runoff retention and/or filtration for this street? Note that 124th is already in use as an existing street Note also that due to elevation this can not be added to the onsite retention facility. 2. If some degree of storm water treatment is required for the 124'" public street, can facilities, such as a bioswale, be bullt in the right of way on County land or must it be underground? 3. There is a current storm water runoff problem as water flows down 192"d Right of Way and erodes across the 124111 gravel road, will the County take care of this flow or will the developer be compensated for fixing It with an appropriate culvert? Remembering this is all on County Right of Way. 4. For on site storm water treatment Is individual home infiltration ok if perk rates are fast enough for area available? 5. The flow control map Indicates level 1, since out flows are onto flat (2% slope) land do you concur? 6. The water quality map shows "basic", do you concur? If a bioswale is used it will be designed for the 2 year storm with but handle erosion issues of the 100 year storm flows, ok? D LANDUSE 1. Any issues with 18 lots on this parcel, lot sizes, shapes, frontages, shared driveways? 2. Significant trees, who can I review this with? There is limited potential for grouping trees, thus the retained trees will be a hazard for blow clown , can I use new street trees to compensate E PRELIMINARY PLAT SUBMITAL 1. Is th Is package acceptable: Cover sheet with sm notes per CAD standard Topo survey at 5' gradient lines Site plan with existing tree inventory shown landscaping plan with new and significant tree retention shown 2. How much of the utilities design do you want during the preliminary plat approval process?. The actual utilities designs will be done by Soos Creek Utility and Puget Sound Energy after the prelim plat is granted. ® King County Deparbnent of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 TIY (206) 296-7217 Alternative formats available upon request Drop-Off Cover Sheet for Land Use Services Division **************************** IMPORTANT *************************"'**fl PROJECT NUMBER AND NAME IS NECESSARY FOR ALL DROP-OFFS Project No.: _ _..:..A_0_3'P __ o_z_J_~ ________ _ Project Name: 5° OS CR~<,.<:'.. ?'-A, FROM: Rt CJ<; Cos~ Company Name / Contact Person TelephoneNo.: 20(:,-7:ry-/~17 TO: k, f-1 CLe1 '-'...ssE"-' --'--'-'-'-...:_-=-=c:...:...--==-=------------ Date Received by LUSD ~ ~ (C ~ ii 11\/ [E [D) OCT 2 9 2003 K.C. D.D.E.S. MATION REQUESTED BY KING COUNTY STAFF (please print) Short Pl Pleases • 1 dropped-off: ,,.t5 c;,•~e::.....---------------------~-------------- l<J;v!St'VV CJ'F-pc.-, "f'<...1-,rJ ·-,,::, Z_J-Lc"T.5 $ Lot Line Adjustment Permit Please specify item(s) dropped-off: Right of Way Permit Please specify item(s) dropped-off: Clearing / Grading Permit Additional information requested; please specify item(s) dropped-off: Other:------------------------------------- PLEASE NOTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything. Assistance in finding a project number can be provided by speaking to a Land Use Services Division Person of the Day (POD) or the Zoning/Land Use Technician. Your cooperation is important. Thank you. LUSD Drop-Off Cover Sheet lg-cvs-dropoff.pdf 05-30-2002 Page 1 of 1 SOOS CREEK 18 LOT PLAT CIVIL ENGINEERING TECHNICAL DESIGN AND INFORMATION REPORT FOR PRELIMINARY PLAT REVIEW For the King County DOES: SUBDIVISION FILE ___ _ Sept 21, 2003 Richard A Boston Boston Design and Development Co LLC 425-226-2145: Q ~ (C IE~ VJ IE ij Neal M Jacques. P.E. ID) '2.003 Jacques Consulting \rU OC1 0 9 206-242-5322 K,C. o.o.E.S- Soos Creek Plat TIR 1 -· By Jacques Consulting Sept 21, 2003 TABLE OF CONTENTS I. Project Overview II Preliminary Conditions Summary III. Off-site Analysis IV. Retention and Infiltration Design V Conveyance System Design VI. Water Quality Design VII. Drainage Basins VIII. Other Permits IX. Erosion and Sedimentation Control Piao X. Bond Quantities, Easements and Declarations XI. Maintenance Manual Soos Creek Plat TIR 2 By Jacques Consulting Sept21,2003 TIR Section I PRO.JECT OVERVIEW The project consists of platting and developing 3.2 acres to 18 lots, current zoning ofR6. Lot size averages 6200 sq ft; ranging front 5750 to 8000 sq ft. Lot widths range from 50 to 80 feet and lengths range from 80 feet to 120 feet. The land is sloping, 14% overall average, down to the east over looking Soos Creek headwaters which are contained in the King County Park, "Boulevard Lane", which is directly adjacent to the east. Due to the location along the ridge upper lots may view Mount Rainier and most homes will likely be daylight basement style. When home and driveway construction is complete, the site will be approximately 35% impervious surface. Street access is from SE 192nd Street via 1241h Ave SE. There are no sight distance issues, visibility onto 192°d exceeds 500 fuet in both directions. A Traffic Concurrency Certificate bas been given by King County. 1241h exists as a gravel road but must be improved to a 500 foot long one half street (20 foot wide pavement) but meeting Sub Access Street Standards (20 homes utilizing); the grade is flat, less than 2%. This street does not lie on the subject parcel being platted but is to the south; the street centerline would be on the section line/property line. Since the adjacent parcel to the east is King County Park Land, the street could be built as a full 28 fl wide street if the County dedicates right of way. No sidewalks exist in the area and this development proposes sidewalks on one side. A new 220 foot long public Minor Access Street will extend east from 124'h and will terminate up the hill in an 80 foot diameter curbed cul-de-sac. This shall be per King County Road Standards with 22 feet wide pavement, curb and gutter and with 5 feet sidewalk on one side; the maximum grade will be 15%. Existing tree cover is a mix of fir maple and alder. Significant tree retention requirements will be achieved by retention along the edges of the plat and with new street trees. Storm water within the development will be collected by street catch basins and conveyed to an infiltration pond area located at the north-east corner of the property. Water Quality will be provided by incorporating a wet pond. Discharge will be into the flat land under power lines on the east side the subject parcel. This discharge water will flow across buffer to wetland then to Soos Creek. All utility systems are currently adjacent or within 300 feet of the property. Soos Creek Utility provides sewer and water. A sewer manhole exists 40 feet east of the property on King County Park Land in a high voltage power line easement area. This area is likely now classified as wetland buffer area and a sensitive area variance will be required to access it. Water is available from 12" mains on both the north and south side of the property. Easements exist and the likely connection point is at I 9200 • Puget Sound Energy has a 2" gas main in I 92°d and Soos Creek Plat TIR 3 By Jacques Consulting Sept 21, 2003 overhead primary high voltage power is located at the south-west corner. No public street pavement cutting is required to access sewer, water, power, or gas services. Site development grading will be minimal, 2000 to 3000 cu yds; the roadway will basically follow the terrain with grading to meet drainage and street slope requirements. The Detention pond will be approximately 1000 cu yds. Utility trenching will be approximately 3000 cu yards. Soos Creek Plat TIR 4 By Jacques Consulting Sept21,2003 TIR Section II Preliminary Conditions Summary The site is located on the hillside east of Soos Creek at an elevation of approximately 400 feet. The western sides of the site is fairly steep slope (25%) and this slope reduces as you go eastward where at the eastern property line the slope is relatively flat (less than 5%) The north- eastern portion of the site where the detention pond would go is at the 380-foot elevation level. There are no sensitive areas, neither steep slopes nor wet areas. The site is covered with fir, hemlock, maple, cedar, and alder trees, predominately 6" to 18" diameter with underbrush primarily of Oregon grape, salal, and ferns with a heavy growth of blackberry on the south eastern portion. The soil is well drained with no single point runoff onto or across this site. TIR Section m. Off-site Analysis The one-mile radius surrounding area is developed and built out into approximately 4 homes per acre plats with sporadic undeveloped acreage tracts. The property immediately adjacent to the west and south are of the subject site are 2 acre single family sites. The area to the north is undeveloped and the undeveloped lowland to the east is King County Park Land (wetland under High-voltage Transmission Lines). During storm events, drainage flow onto the subject property is :from highlands on the west in sheet or underground flow, with no point sources nor valleys. Flow off the site is to the west into the Soos Creek Drainage basin. The site and the offsite terrain at the property line is less than 5% slope. No significant storm water flows between adjacent properties on the south or north. Downstream discharge will be incorporated into the Soos Creek basin. This drainage basin is relatively flat, Y:, to 1 % sloping down to the south with heavily vegetated wetland for several miles. Note that the Soos Creek Drainage basin upstream of this point is approximately 290 acres of residential developed area. Soos Creek Plat TIR 5 By Jacques Consulting Sept 21, 2003 Tm Section IV. Retention and Infiltration Design Storm water systems will be designed to include runoff from all impervious surfaces, both roadways and roofs. Calculations will be per the 1999 King County RTS (KCRTS). Rainfall will use the Landsburg scale factor 0.85. The rainfall for the 2, 10, 25, and 100 year 24 hour storm events are: 2.0", 2.9", 3.4", 3.9" respectively. Six test pits, spaced to cover the whole property, were dug and consistant results were found in all locations. The top 12" is sandy loam top soil, the next 3 feet is fine sand, and below 4 feet is gravel with course cobbles. The soil type throughout the site is EPA IA soil; sandy loams and gravel with fast percolation rates. Runoff calculations will be based on 19,000 sq ft new pavement and sidewalk areas and will be processed for flow control by orifice out of a wet pond. Elements will be designed for the "Level 1" flow control with discharge into an area with a slope of less than 2%. The storm water off the 18 homes (roof area estimated at 1,500 sq ft per house) with be handled with individual site infiltration on each lot. No nearby wells or sewers will be affected by nmoff from this project. Most properties are served by public water mains ahhough a private well exists on the upland property to the west. The same is true of sewers, septics are only on the large multi acre parcels to the south and west. Soos Creek Plat TIR 6 By Jacques Consulting Sept 21, 2003 Pervious to Impervious Area Conversion Existing Forest land 3.2 acres = 139,392 sq ft New Streets On site 280 ft street x 24' wide= 6,720 220' access tract x 18' = 3,960 18 driveways x 16' x24' = 6,912 17,592 sq ft Street Sidewalks 280' x 5 = 1,400 New Homes 18 homes x 1500 sq ft= 27,000 18 sidewalks x 5' x 15' = 1,350 30,750 sq ft Total new onsite impervious= 48,342 sq ft = 35% of site area Offsite Streets Existing impervious 330 x 20 = 6,600 New impervious 330 x 26 = 8.580 Delta = 2,000 sq ft Soos Creek Plat TIR 7 By Jacques Consulting Sept 21, 2003 TIR Section V. Surface Water Quality Design Water quality at this site will meet King County "Basic" standards. The detention pond will be designed as a wet pond to incorporate water quality filtration. The runoff from roadways may also be routed through a bio swale prior to the retention pond. If a bio-swale is incorporated into the design it will be constructed to handle the required water quality treatment per the 1998 KC SWM Water Quality Manual. The grass bio-swale will be constructed with an impervious liner precluding infiltration from the swale. The bios-wale will be sized for surface flow at the 2-year storm level (per KCRTS method). The channeling will be designed to handle 100 year flows. To comply with 98 KCSWM code for water quality; the bio-swale design is governed by the minimum requirements. It will be at least l 00 feet long, have an appropriate bottom width, and 3: I side slopes. Soos Creek Plat TIR 8 By Jacques Consulting Sept 21, 2003 TIR Section VI Conveyance System Design The KC RTS Method will be used to size the piping for computing peak flow from the 25-year event. The Roadway drain piping is will be an appropriately sized PVC tight line leading to the bio-fiher channel and then the pond area. Storm water from roof drainage will be collected via separate PVC piping and routed direct to the pond. TIR Section VII. Not Used TIR Section VIII. Other Permits All Permits required for platting will be from the King County DDES. This will include clearing and grading as well as construction of the roadway and storm system. The utilities design and construction will be performed by Soos Creek Sewer and Water, and Puget Sound Energy. Fire department review certificate will be from the King County Fire Marshall. Soos Creek Plat TIR 9 By Jacques Consulting Sept21,2003 TIR Section IX. Erosion and Sedimentatioo Control Plan Protection comprises filter fencing along the east property line at the low point. Due to street configuration no runoff or mud will be tracked onto public roads. Due to the soil conditions, runoff of mud during construction is not likely. If any occurs at all during utilities and road construction, it will flow into the natural low area (east side of site) for settling and infiltration. Straw bales and straw spreading will be used as required to minimize and control erosion during grading. Hydro-seeding will be used as required when construction is complete, to replace home site location areas cleared during the grading process Truck access for construction will be at the site south east property comer with access from 124t1t Ave .. Temporary rock entrances per KC design manual will be used: 2" deep rock bed 24' wide by 60' long. TIR Section X. Bond Quantities, Easements and Declarations Bond quantities: see Bond worksheet per King County. The Minor Access public roadway 30-foot right-of-way will be dedicated to the County (utilities in the street). The 124tlt Sub Access Street 30 foot wide, or appropriate, right of way will be dedicated to the County (the County may chose to dedicate additional right of way via park property). Ten-foot wide easements will be provided to the County for access to the storm water system piping through private property. The storm water bio-swale and infiltration pond area shall be platted as a tract for this purpose. This area may be deeded to the City as required. No recreation space will be platted, fee in lue will be paid. Covenants may be developed as required for significant tree retention. Ten-foot wide easements within this area and along the course of water and sewer lines will be provided to Soos Creek Utilities. A ten-foot easement along the new public road will be granted to PSE fur gas and electric utilities TIR Section XI. Maintenance Manual Per King County Surface Water Design Manual of 1998 Soos Creek Plat TIR 10 By Jacques Consulting Sept 21, 2003 Map Output ra_gc 1 u1 ~ R6 Z on1ng --' ·L . .I r -I ' J \ I I f-.. '~.V.D .!.' . .. ' . ' ,,. 1 ] y .. ~--~--iliJ • la-h '/'· -, _in-t ___ · _1t~r-~ -.· . -::- Fr' ·'-' < R..t-SOi-.. u_ ~~I ... · . ;:@, ... .,,. ' I :i: tf $ :.;;~-~ ·&~ . ~ = R-. 1 ' :; '·-~ ' " -~~ ... ~· i=_ re ,___ ,___ l ~\,~u..::;t] s .. :5:h -f lJ ITT [ 1) y LL , 11 ix ____ sc.:!lertt,;_s:r, ___ -... ,_ / ID L,11 L R::&:SO l'l"\<.>--"' ,_ ,_ -s ~·!trrtH'•-' R..&-80 './ I' -~-. tL-~ -, ( r , , A~ , ,, :::; ~ \,!I~ :;: ~«. •;ict1lJ\il.,S£1 ~ -' ± ,__ ~r ...._ . • -84'0 'r ~M ~ -w ....;E ~:.}~,} ..... ..-t: . ;:: ':,, ff"E I-~ }.. f"'I"' ~( ... R.,&;.SO l.-1 L---:c.. ,n V .;., .., ' 1-...-,_ . 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King C.Unly.,.,.. not ba liable for any -1. special, indlroc:I, incidonlal, or consequential do-induding, but not llmlb>d to, revenues or lost proffls resulting from the use or misUSe of the ltloi11atlon contained ort this n-.,. lvry sale of this map or Won1a&n on i& ma is exce 'Vitten · n of Co KOl~I G5'li:Jmttu,l -l&ro>i..,.J °""""'"""IS.areh• Ill' visiting -and olhor l<Jng County-pages, you e,cpn,nly -to ba bound by -and=-•• of the silt. lTu,:_<!i!l"il•, ' I http://wwwS.metrokc.gov/servlet/com.esri.esrimapEsrimap?ServiceName=overview&Clie... 9/27/2003 Map Output Lakes and 100 year Floodplain ;: ~- "1 ___ Sl:.118TH.ST. .. _------... i. ,. UJ ---------- "' ,. <: 1 fl:TH . .A'IIIL R ,. g < ,,: ~ ~ ~-.J.. __ _. "' .~ "' -~ r..' :___. 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Any 'SSle of this map or information on is ma is ohibited exoe v«itlen rn*sion of Co l<:ln.QJ§:Ount:¥,·I ~S,C.&ntet'j ~Elwa.l _Sef:\liOlS. I Comments I Senm;:fl; By visiting this and other King County web pages, you e)(pres&iy agree to be bound by tenns and conditions of the site. TIJo_ g_~ilt,_~ http://www5.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&Clie... 2/18/2003 Map Output " "! " --: --____ SE._118T_'H_SJ ,: ~ ~ .. Wetlands ' i' __ ..........:_SE_11l'.T:H SJ : : ------·-;'----·· {i ....... ::_q w ., ' ... > " ;,: .... ·;· N 1 (C) 2 .. se_1ffltLS~_.;._ ---'-J~ 3 ~ . Col.Inly Boundary Streets Parcel lncoQarated Area Legend LliKils and Lar-;e Fw,ars SAO o\\ol!and ,J " 3 ;g!, ra~c _ v.1 " "! "' > < ;; :t ' ... "";urH rt··-~ , ----I " z N " ' .. 1se...1u!!:tr: .... sr: information Included on th;s map has been compiled by King County staff from a variety of sourees and is subject to change \Mthout notice. County makes no represenlations or warranties, express or implied, es to a,x:uraey, completeness, 1imelines.s, or rights to the use of such formation. King County shal not be liabte fOf any general, special, indirect. incidental, or consequenbl damages including, but not limited ta. st revenues or lost profits re&ulHng from the use or miSuse of the information contained on thls map. Ally sale of this map or information on is. ma is ohibited exce written ion ol Kf Co Kin..QJ;oul}!y_ I GIS Canter I New~ I Ser'Jices I Comments I Se.arch By visiting this and other King County ....,.b pages, you expressly agree to be bound by terms. and conditions of the site. J'.JJ-9.:. dii-:!tJ"il.:S, http://wwwS.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName="Overview&Clie ... 2/18/2003 Map Output ~King Co~ ->·"-·· .. , .. , ·-'"'-·-~:c...J ~-'-··-··· Steep Slopes and~Landslide Areas -+ -----IJ.IJ. ___ ~-- " ~ < ,: ~ ~ N •\ ... "' ,.: " N: -. 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Aff/ sale of this map or information on is ma Is ohlblted exce 'Mitten nis5ion of · Co Jf;;~,~.I~1t11#.L 1. '.;;.l'~-~!3~?_( I ~~0?· I §.»cJ:.'!}::~ 1 i_:.amp:;an~. ! ~'?;;;t.rr,:)_~_ By visiting this and other King County web pages. you expressly agree to be bound by tem't$ and condfflons of the $ke. Th,} :-t 1"-,_~_,;1,~ http:/ /wwwS. metrokc .gov/ servlet/ com. esri. esri map .Esrimap? ServiceName=overview&C Ii e... 2/18/2003 .... -----. Streams and Landslide Areas •rl . . -.. . _!!J ' ·1._ .... ':!--.._ L, ..._\ '--......_ __ /'/ ( I ... ~ / I , I I/ ' \ \ i /1_/ '-• PIERCE COUNTY •• ----.,' \ \ \ •• \ \, ( \ • / / ,/ I~ l l 1 ' r.1£1 : I , I , l ·\ \ '\ ~) l .. J-~ ,/'-·:,._.'c-...... / .. '-.... • "I • . . ' I I • .,; '·-· ...... J /· L, \ \ .,.,.. .• .1 I / ~ f· ..... -, ...... )~ ; . . ",> r.. i \ "-• • ) (J. l \l ... \ '.··.I' I \ . I . , \ ··. ~ ·.. ··, ~ }( '. ]~ I ; ( ~\··.I)! -1-'. I I ' ' \ ; c-; \ U1---. i ·. 'l · .. 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I..,· .. ·-· : \ ·~ I i~ !. _/•,, .•, i ( , I ~ .,:d<.uw -..• ... ::.J i /_ii • 1') I _;<'·./,... !}-7 . ~l., L:r1 r .·. e-,,--.J I · ! / ' r' '"'-/ ' ~-( I ,,.: \ i ,,·, . ...\ ' \ I I ,• .... • ' . I ,V ~ '• \ -.. -...... !~ !/ rt 1:~ \ ,... . .,., I 1, ,·; --1 , ---.1',; ~;.J·--r' y· I '--,_i .. ; ~ •-,;~---~>-•,/ ' I i t___• : / / ·, --..... I \ , ' . I ' • ' .J , . . . I --"1---. , . .~ _,( \ ;'.·.'. •.. .. I NA '""· 1 ca.;....j i . • -., I . "l ·,~ -KING COUNTY •'·- • • PIERCE COUNTY \ \ '< -----· • i1/4 Jo 3 -~Gca10i--~ . j:'.'.\vY\t ~I t-J~Cl-\ ~ \2-1.0C, t,o,dc.,-.) PRELIMINARY PLAT PRE-APP REVIEW ISSUES FOR SOOS CREEK 18' LOT PbAT J-lf; ~\"bi cv----1; By BOSTON DESIGN AND DEVELOPMENT October 2003 The following issues need to be addressed and the County opinion given during the pre-application meeting for this formal plat. These issues are listed in order of importance. A> WETLAND DELINEATION 1. Adjacent to the subject parcel is a King County parcel which contains Soos Creek wetlands # 5402. Can I use the King County 1990 Wetland delineation map to position the 100' buffer setback line? 2. Does the County agree with that delineation now or must I have a consulting firm re- verify that delineation? Preliminary soil tests show that the County delineation line is very acairate, plus I don't need to be precise because my property is about 140 to 150 feet away from it. Please de1ermlne this prior to the pre-app meeting! 3. Soos Creek Sewer manhole #384 lies in the wetland 100'.Jn!ff,r,about 40 feet from the~al wetland, how do I get aproval to en1er to connect? ~~ ~'-"" . -CP«>'?"f ~-C<I"'{ -~.,,~, '"-'01-IX\ ~d ,--,-, l!!- B> STREETS , ~()() ~ \ ?),..r\e~c;..\ ~ 1. These lots will enter onto 192"d at 124 Ave SE. While 192 is at a 9% down grade, site distance 1 t{' · is in excess of 500 feet, thus no stopping site distance issue. Per 1993 Road Standards sec 2.13, 10'?'-VJ, "entering• site distance does not apply, are there any other site distance entering issues? If ,o this development is expanded in a phase two to a total of 26 lots. any other issues? 1DU1 ~ \.ti 2-ro. 1 2. The existing arterials street, 124th Ave SE centers on the section line (30' each side); I have a 30' easement from my neighbor and an existing gravel road through it. Since the County owns the parcel adjacent to the east, will they allow/provide/dedicate the 30' right of way on their side. ~ -\<.f W _ ~OW~, rv\-~\lt" 3. I propose to create a small mini park on a 20' strip of County park land {along 124th ); will it be allowed? Would it simply be part of the right of way? The purpose is so that people could walk along the edge of the county park/wetland and view it These 30 acres of land is administered by Parks Department as it also oontains • a smaH 2 acre park at the northern end known as "Boulevar~Jane Park". The parks department has verbally said they support this kind of improvement. ~ 4. Per Road Standards sec 3.01 we are planning sidewalks on one side of the sub access 124th and the minor access 191st, ok?. 5. Any issues if we only put in a half street for 124u, with 20' wide paving? '§l 6. The -stntet. SE 191st , will 1ennina1e in an 80' dia paved«:~~~~ diameter be reduced to 80 feet per 2.08 A1? 0 ~ LL::, U W ~I[)' +-~v:io..\'-<-lY o... OCT O 9 2003 ,(:..'\!:-,._, ~ P\ -\~) Cd'J -(c(f) J !CO(?rrf-f& d K.C. D.D.E.S. w1 m 1d P1 ma,a;n lrD ?fl) :)_g b ' .. *~j0fY 7. Any Issues with the private access tracts serving 6 houses each side of the cul-de-sac? 8. Are there any Street Li~htlng requirement!i, if so by what standards? -C\0'1(,-~c.c... 1 \Cf 2.i\O · < VJD..-k.e..f =-c.J!./ C. DRAINAGE I e, .&>I \ ..J -. _\..,_ A·-·. __ .-Ir .. -.._ 1...-v\)\....-\ <..!-UW ~=~CLM , C:.c0C · LVILLU' uq.e.-~ 1. We plan to widen and pave the offsite existing 124111 gravel road. How does the County plan to deal with storm runoff retention and/or filtration for this street? Note that 124111 is already in use as an existing street. Note also that due to elevation this can not be added to the onsite retention facility. 2. H some degree of storm water treatment is required for the 124th public street, can facilities, such as a bioswale, be built in the right of way on County land or must it be underground? ~ · T2£1CT o-1--e,i-k., 3. There is a current storm water runoff problem as water flows down 192"ct Right of Way and erodes across the 124"' gravel road, will the County take care of this flow or will the developer be compensated for fixing it with an appropriate culvert? Remembering this is all on County Right of Way. ~O-t'2.. 4. For onsite storm water treatment·\ Is ingividual)!ome infiltration ok if perk rates are fast enough for area available? v..,e_<;;, ,.;::, \#\\...I +t. \QA~· "bi\rl~ - /. The flow control map Indicates i9vel 1, since out flows are onto flat (2% slope) land do you concur? " \e»t:. l 2--::;v.)Dt-1\ ~~ -\o ~\J<e.... 6. The water quality map shows "basic", do you concur? If a bioswale is used it will be designed for the 2 year storm with but handle erosion iss1,1es of the 100 year storm flows, ok? -~-'i.C?~-~· i.lo.ct--wo0ld..nucl ~hl::::, D LAND USE -~ ~ow -rrcv.j l'1Uc\. '(G~ D M a<\) . 1. Any issues with 18 lots on this parcel, lot sizes, shapes, frontages, shared driveways? 2. Significant trees, who can I review this with? There is limited potential for grouping trees, thus the retained trees wilt be a hazard for blow down , C3ll I use new street trees to compensate E PRELIMINARY PLAT SUBMITAL 1. Is this package acceptable: Cover sheet with STD notes per CAD standard Topo survey at 5' gradient lines -'\.' Site plan with existing tree inventory shown landscaping plan with new and significant tree retention shown 2. How much of the utilities design do you want during the preliminary plat approval process?. The actual utilities designs will be done by Soos Creek Utility and Puget Sound Energy after the prelim plat is granted. L6~-..\ol~ ~~ -~,~ -so-~o-\\~cb,it~\:u-.\ -~ ~t-J~S,-c;ie:oq. -~'('(u-),;j£ M9~ ~s -~\ Parcel Number: 6199000260 Taxpayer: REL ESTATE PROPERTIES LLC Annexation: N/A Jurisdiction: Unincorporated King County Situs Address: Postal City: Renton, 98058 Plat Name: NORTHWESTERN GARDEN TRACTS DIV NO. 0 Rec: nit Lot: 13; Block: NIA Kroll Page: 605 w Thomas Bros. Page: 686 1/4-S-T-R: SW-33-23-5 Acres: 3.30 (143748 SqFt.) Current Zoning: R-6-SO Potential Zoning: Comp. Plan Land Use: um Assesso~s Open Space: NIA Commercial Use: NIA Number of Units: N/A Mobile Home: N Land Value: 93000 Improvements Value: o Community Plan Area: Soos Creek Unincorporated Area Council: N/A School District: Renton School District 403 Fire District: 40 Roads MPS Zone: 342 ($3730.00) Waterfront: Water Service: Water Service Planning Area: Soos Creek Water And Sewer District Sewer Service: Airport Noise Remedy Program: N/A Bald Eagle Flag: NIA Council District (1996-2001): 9 Kent Pullen (R) Council District (2002): 5 Dwight Pelz Drainage Basin: Soos Creek, WRIA 9 Police: King County, Pct: 3, Dist: F3 Service/Finance Strategy Area: Full Service Snowload Zone: Standard Agricultural Production District: N Forest Production District: N Rural Forest Focus Area: N TOR Type: NIA TOR Status: NIA TOR Permit Number: N/A ----------------- Building Inspection Area: Cleo Rubalcaba Clearing Inspection Area: Jim Ballweber Code Enforcement Inspection Area: Sheryl Lux ESA Inspection Area Kathy Newborn Grading Inspection Area: Ramon Locsin Land Use Inspection Area: Tenzing Thinley ----------------------- Sens. Areas Notice(s) on Title: October 24, 2003 Kim Clawsen King County DOES Re: Prelim Plat "A03P0286" "Soos Creek Piaf Dear Kim, There is a slight change to the preliminary plat pre-app submittal. We have added some additional property bringing the plat to 4.45 acres, thus we are now proposing a 25 lot plat (instead of 18). We have the Transportation Concurrencys for both properties totalling 25 lots, enclosed. Please forward this 11"x17" revised plat plan to the people doing the review of my proposed plat. The large CAD drawing is in work but will not be ready until we make the formal plat submittal. The pre-app meeting is scheduled for Tuesday Nov 4th and I hope they will have time to see this also. Sincerely uafr Rick Boston 206-755-1617 c, .,< '~ ('>( .-, \.)"" Road Services Division Department of Transportation KSC-TR-0313 201 South Jackson Street Seattle, WA 98104-3856 TYPE OF CERTIFICATE C8] ORIGINAL 0 CONDITIONAL February 7, 2003 Certificate # 01461 File Number: 03-01-23-01 Exoires: Februa-· 7 2004 CERTIFICATE OF TRANSPORTATION CONCURRENCY D Specific conditions are described on the reverse side ofthis certificate. Pursuant to King County Code, Chapter 14. 70 as amended, this certificate confinns that the level of service standard used in the Transportation Concurrency Management program has been satisfied and sufficient road capacity is reserved for the development project described below. IMPORTANT: This certificate does not guarantee a development permit. Other transportation improvements and mitigation will be required to comply with Intersection Standards, Mitigation Payment System, King County road standards, and/or safety needs. I. Applicant Name and Address: Richard Boston, Boston Design & Development, LLC 13425 E Lake Kathleen Drive SE, Renton, WA 98059 2. Property Location: a. Property Address: 124th Avenue SE & SE 192nd Street b. Development Name: c. Parcel Nwnber; 6199000260 3. Type of Development Permit To Be Requested: Formal Plat 4. Proposed Land Use: Single Family Residences 5. Zone Location and Reserved Units: a. Concurrency Zone: 799 Community Planning Area: Soos Creek i. Commercial ProJect -Total Squarer:J: 0 ii. Multi-family -Number of Units: iii. Single family -Number of Uni ; 19 6. This Certificate is subject to the followin conditions: a. This Certificate of Concurrency runs with the land and is transferable only to subsequent owners of the same property for the stated development, subject to the terms, conditions and expiration date listed herein. This Certificate of Concurrency is not transferable to any ·other property and has no commercial value. This Certificate Expires: February 7, 2004 unless you apply for the development permit described above, prior to that date. If this requirement is not met the King County Department of Transportation reserves the option to cancel your certificate and capacity reservation. When you apply for a development permit with King County's Department of Development and Environmental Services (DDES), bring this Certificate of Transportation Concurrency as part of the development application package. If you have any questions, please call (206) 263-4722. ·~·2- .,--~ d . . . ··, . ~/ ~. ----X;-~:=::-·--- Linda Dougherty, Manager, Road Service~ DepartnientofTransportation King County, Washington .. -, .. ,, . d p, ~ ,. I"' p I"" ' t • ? ~ lflt .::1 '-~:, d ft.M!f ~ 1· ); . Ii' .o · • I ,!i · f • . • •~ o g iil J .. fl ·f .l";i • • 11 t .. )! u ii IH I Ii !l h I ~ L _: ,-qi 'ii -"l'l' ~ ~ ... 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I I l '"i I ; I , -C I '/ ;:i • 5l' ! , } I u::i, l ~ Ji. i 'I ·'"~ ~ ·m . I• "' ] ,,_ "' '• • ijc/ ! <O -0 ' , Q " ' ' " -" ' 0 / ~a~ ~ii L, • O 1 , ~ ' -• J;I ll . ' ~ ~ ; 1 ~ -...J~ o I ;: -°' ~ j ;I --~ ..,_ ! l I I~ I /" 0 I '" ·r ,.,· __ ,·_._·_.·_-;J)..:'_iir_-_.:_ __ ;_t: ,t; . -11~~ I _y ~(--f-~ _·;!;',_:Jf--'3it I ~ I l\YI ~!l. -._ l··•· I ·~ ..-') : . ,:. I I t,/ ,.· .-, i__ .. -• -f-,, ,r_ -,-~ I LJ~:. "'-" ,;-,. di~ ! 0 0 'I ~ f . ·- ' l { (; ( J .f I I ; I i / . / / I / I . I-' I J / I I I ( \ \ \~ \\ -,i z: ;, C v 'I l"'9 ">.P -'\-~ 17 1 -., " r 11 ~ ~~)) t. ~~- ·--.. a ,., • ~ )> 0 0 Al =' 0 z 0 ·11 ---1 u I Pl ::0 i'l (/) ,-- < - ~ (/) )> fT1 (; z --, )> fT1 ~ o' ;o z -< .?o--;' '1: I ~ '.,, ;;:: / IC] jg , ~ ~ I O ~ --J l t1 It t,,J:;s:: ' . J u . JI. ,. \ I I. ' ' I I i '\~_·\~-' ·".:<jf.;; N·_f. \i''f/ !( I I I ...( :o Cl ~;~ L\'11:. " II' ~ • ' I _ _cl:'._ ----I .. 1 vL * ,,,, I -----",.n : . .,, ~ 1-i I I - ~( 1 -¢11 / / / \:; I' *1 ./ ; /-J 11t ~ \ .3?"1· j <, ~ ,,,. 11' ; ;; I ! ,\ ; liii 'ii ! lg H ORAIIN BY: R.BRIIJKMAt-1 I SOOS CREEi ~ DESIGN BY: R. BOSTON I -~ ENGINEERING BY: N. JACQUES ;is LoT' p LA r I 1i I '"' • -~ ~ Jacques Consulting ~ u i ; Of\H~ER "" ___, ';. ';. ~ ., II' " o*::;; :zj ;d CJ "' "' [Tl r'1 P1 z 000 ro o n ~ a.: ::.:. C ro 0 0 C m Boston Desigr1 and :::i i r- ~ CHECKED BY: I 0, REVISION: • 9.. ~-L 19/0,;-.;1JE121.?tlr 1~0J S[ fox I,' /! 5/J'.JOO -02SO Neal ,Jacques PC 2GJJ SW 163 Place, Auricn, WA 98166 Phone 206-247-5322 I 25 [ lad)foMfe"tlng11!€;frien1Jnl.f 98059 Ph0ne 425~226-2145 ro( 425~-228-J653 ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton, Washington 98055-1219 (206) 296-6600 TTY (206) 296-7217 Application Number(s): Application for Land Use Permits Alternative formats available · upon request ra. [E (F' [E I' 'Vl fs [O) lnl 's7 ~ .1 VJ u;; 0 OCT O 9 2003 K.C. D.D.E.S .. Date Received: Stam DO NOT WRITE ABOVE THIS DIVIDER I (We) request the following permit(s) or approval(s): 0 0 0 0 0 0 0 El' 0 0 0 0 0 0 0 . Building Permit 0 Clearing & Grading Permit 0 Temporary Use Permit 0 Binding Site Plan 0 Site Development Permit 0 Boundary Line Adjustment Q Short Subdivision 0 Formal Subdivision 0 Urban Planned Development 0 Plat Alteration 0 Plat Vacation O Road Variance 0 Drainage Variance or Adjustment 0 Right-of-Way Use Permit O Shoreline Exemption 0 Shoreline Substantial Development Permit Shoreline Conditional Use Permit Shoreline Variance Shoreline Redesignation Zoning Variance Conditional Use Permit Reuse of Public Schools Special Use Permit Zone Reclassification Site Specific Comprehensive Plan Amendment P-Suffix Amendment Special District Overlay Removal Reasonable Use Exception Public Agency & Utility Exception Period Review for Mining Sites I, R LC.f-t.,.{<"'1) ig <=>.l\<l "-1 , being duly sworn, state that I am the owner or (print name) officer of the corporation owning property described in the legal description filed with this application and that I have reviewed the rules and regulations of the Department of Development and Environmental Services (ODES) regarding the preparation and filing of this application and that all statements, answers and information submitted with this application are in all respects true, accurate and complete to the best of my knowledge and belief. During the review of this application, it may be necessary for DOES staff to make one or more site visits. By signing this application form, you are giving permission for these visits .. If it is rental property, the owner hereby agrees to notify tenants of possible site visits~. . · &;: /( I UJ;., J?.0 <;if.::. :S.-nl .J , · printed name signature / J '-< W--~. l«; KA'TVt L~~ MS.'£, mailing address city state zip LL<L corporation or company name t/zrr-22, -z, vr telephone If applicable, state below, the name, address and telephone number of the authorized applicant for this application as shown on the Certification and Transfer of Application Status form filed with this application. name mailing address telephone city state zip Application for Land Use Permit{s) lc-app-luper 2111/02 Page 1 of 2 ® King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest .. Certification of Applicant Status ·• . Renton, Washington 98055-1219 (206) 296-6600 TTY (206) 296-7217 Alternative formats available upon request Permit Number: ~Ai>""'-'-· _3~f~o_;zg __ VJ_. _ FOR INDIVIDUALS: · I, , (print name) hereby certify that I am an/the owner of the property which is the subject of this application for permit or approval. If I am not the sole owner of the property, I certify that I am authorized to apply for this permit or approval by any and all other owners of the property. My mailing address is: I further certify that I am the "applicant'' for this permit or approval and am financially responsible for all fees and will receive any refunds paid. I shall remain the "applicant" for the duration of this permit or approval unless I transfer my "applicant" status in writing on a form provided by this department. By being the "applicant," that individual assumes financial responsibility for all fees and will receive refunds paid. Signature of Applicant OR FOR CORPORATIONS/BUSINESS ASSOCIATIONS: Date Signed~ lo)~(C~\l~\S\D) \fu OCT o 9 2003 I, f< IC.l-t-~.0 ff..::,~~ o-J , (print name) heretl'(..e.r®tiat$0m an authorized agent of E (.) :t'P LL<!., , a corporation, or other business association authorized to do business in the State of Washington which is the subject of this application for permit or approval. If this business association is not the so/.e owner of the property, I certify that this business association is authorized to apply for the permit or approval by any and all other owners of the property. The mailing address of this business association is: tJ<fU-&,<...re, ~,l,J'--~ ore >I- I further certify that the above-named business association is the "applicant" for this permit or approval and is financially responsible for all fees and will receive any refunds paid. This association shall remain the "applicant" for the duration of this permit or approval unless it transfers its "applicant" status in writing or on a form provided by this department. der the laws of the State of Washington that the foregoing is .J.-~----' Signature of Applicant Cerflfication of Applicant Status lc-cer-apstat.pdf 08/27/02 Page 1 of 2 ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue SW Renton, WA 98055-1219 (206) 296-6600 TTY (206) 296-7217 STATE OF WASHINGTON COUNTY OF KING ) ) ss ) File Number: ------------ Application Name: ~oc.S C'i2fff!;: (P\,.£>-r Aff.•.i ... d.avit. ·.eon ..... c.erning . ' ' . se,1sitive Ar~a~ · pijnipllant~ .· ·.,' .. _, _ ... •, ... , ..... , Alternative formats available upon request f6) lE (C lE ~ w lE ID) lru_ OCT O 9 2003 K.C. D.D.E.S. Project Location: __ l_'l_l_o_o_-_l_Z~'/-t;_A_/!,_flff-_~SE~------------ The undersigned, being first duly sworn on oath deposes and says: 1. That the affiant is competent to be a witness herein; 2. That the affiant is the applicant for the .above project; 3. That to the best of the affiant's knowledge the sensitive areas on the development proposal site have not been illegally altered; and 4. That the affiant has not previously been found to be in violation of sensitive areas regulations for any property in King County, or alternatively, that if there have been any violations, such violations have been/are being cured to the satisfaction of King County. NJtfi , Applicant Signature Date and Place (City and State) I certify under penalty of perjury under the laws of the State of Washington that the foregoing is true and correct. AFADAVIT CONCERNING SENSITNE AREAS COMPLIANCE lc-aff-sacomp 11/02/01 Page I of I !W5PD2ifo Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 TTY (206) 296-7217 Land Use Pre.;.application Meeting Request Form . . . ' . Alternative formats available upon request To be. completed by ODES Staff Pre-application·No. Date Rece.ived (Stamp) Pre-application No. (filled out by King County staff): --------------" -~-r-7s-r-16 ll C. f'L <.. l'\l"'I" ~ ,µ.," Please orint: . Al Applicant Name: RI (.\C <R'c,5...,.-oJ'..,l Date:/ ,o-3--!),ocJ Address: 13Y~ ~ LI< , /::p--r:ut:_«-,..i <])(2, .S-£ Phohe: Lf U -2z<...-Zt '-fS ~iv.re <fS-654 Fax: '1ZS-22 ~-3.6S'3 Project Description: I 'v t..<>'T" .Su-JSt)i .r,s,~ r:liZ .3,2. .1)-C<l./fS 24 ,vCC, R~ Permit(s) being requested: f/2'&.vl, pu,,--'f-OfC. 13' (,<(T" Su B 'DI V1 .s, <S-1\J Project Address/Location: Parcel No(s): /'1/00-124 tit l)V'£ Sf£ €.('1'f00 -()2 (, 0 - Please indicate if pre-application is: RI Land Use Feasibilit[ ~(Ll;[El/~[E~ ~ ~ Mandatory Consolidated OCT O 9 2003 Check the box(es) regarding issues you wish to discuss: K.C. D.D.E.S. l2SI Land Use Permit Issues: (SgPd1v1siojj)/ CUP/ Variances/ Reasonable Use / PAUE ~ Site Issues: Zoning / Setbacks/ Density/ Subdivision l!lesigri / Landsc~ping ~ Site Issues: Traffic/ Road Access/ Road Improvement/ Road ~riances / Parking Layout ~ Site Issues: Drainage/ Site Development/ SWDM Variances & Adjustments D Shoreline Issues:. Substantial Development Permit/ Permitted Uses/ Shoreline Setbacks ~ f>t:"Pl c D SEPA Issues: SEPA Checklist/ Off-Site Improvements/ Mitigation "'t:;-'T J('C'<'!c,..J 1 -l:ar igj Wetland/Stream Issues: Buffers / Building Setbacks/ Flood Plains/ Mitigation -e 'p~it T,, l""''T'&, D Geotechnical Issues: Steep Slope/ Landslide/ Seismic/ Coal Mine/ Erosion f,t,.1::-- D Clearing/Grading Issues: Site Development/ Clearing Restrictions/ Site Restoration D Building Issues: Building/ Mechanical: HVAC/Energy/ Barrier-Free Standards D Fire Issues: UFC / Fireflow /Access/ Sprinklers/ Alarms/ Hazardous Materials D Health Issues: Sewer/ Septic/ Water/ Groundwater/Noise Impacts D Other (Specify):---------------------- ArJ~PDd-Zfo Land·Use Pre-Application Meetings Information & Request Form lc-infreq-preap 12/20/02 Page 1 of 2 Please indicate the numbers and types of representatives that will be at the pre-application meeting from your design team: Will Attend ~ D D ~ Will Not Attend 0Applicant lzsjArchitect jECivil Engineer 0Developer Will Attend D D D 00 Will Not Will Attend Attend fis]Geotechnical Consultant D 12s]Landscape Architect D ~Legal Consultant D 0Property Owner Total Number Attending: __ ......;:3:....._ _____ ___; Will Not Attend fig Structural Engineer 12d Wetlands Consultant 0 Others: ______ _ I certify that I am the applicant for this pre-application meeting request and I understand that DDES will assess hourly review fees for each DDES staff member Involved in pre-application research, meetings and post-meeting follow-up work, and th .. at I assume financial responsibility for all fees associated with this request. /' / ) Note: A minimum advance deposit fee of $373.75 is required to schedule a pre-application meeting. All checks must be payable to King County Office of Finance. · If you have any questions about your pre-application meeting, please contact ODES at (206) 296- 6600. Land Use Pre-Application Meetings Information & Request Form lc-infreq-preap 12/20/02 Page 2 of 2 ® King County Depanment of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 TTY (206) 296-7217 Subdivision Density and Dimension Calculations Alternative formats available upon request File Number (To be filled in by DDES) II PRELIMINARY SUBDIVISION WORKSHEET RELATING TO DENSITY AND DIMENSIONS II Several development regulations play a role in the creation of a subdivision within King County. Determining the allowable density, minimum density, and a lot width on a piece of property can be confusing. This worksheet will assist you in correctly applying specific portions of the code and will be used to determine if a proposed subdivision or short subdivision meets the density and dimensions provisions of the King County Zoning Code (Title 21A). This worksheet is designed to assist applicants and does not replace compliance with adopted local, state and federal laws. Pre-application conferences are required prior to submittal of a subdivision or short subdivision. These conferences help to clarify issues and answer questions. They may save you both time and money by eliminating delays resulting from requests for additional information and revisions. You may call (206) 296-6600 to find out how to arrange for a pre-application conference. Worksheet Prepared By: RIC 1-1.ll..CO C? c.:,"1'i .--J (Print Name) Subdivision Name: socs C'tZ~Ei-<... Comprehensive Plan Land Use Designation:,_IJ_Rc.cg=-,.,-,..J--"-'~-C.. ______ _ Zoning: ~' If more than one Comprehensive Plan Land Use designation or zone classification exists for the property, show the boundary between the land uses or zones and the area within each on the preliminary plat map. If a single lot is divided by a zone boundary, transferring density across zones on that lot may be permitted subject to the provisions of K.C.C. 21A.12.200. Please complete only the applicable portions of this form I. Site Area (K.C.C. 21A.06.1172) also see (K.C.C. 21A.12.080): Site area (in square feet) is the gross horizontal area of the project site, less submerged lands as defined by K.C.C. 21A.06.1265, and less areas which are required to be dedicated on the perimeter of a project site for the public rights-of-way. __ o!J_,-__ square feet in submerged land (any land below the ordinary high = water mark -see K.C.C. 21A.06.825) '0-f1 re:: \Q) square feet in perimeter rights-of-way which will ~ijtlh@t1©,ij l'!J ~ Q dedicated (area 30 feet from cen iNe ofroad) 003 Total OCT O 9 2 ---- + K.C. D.0.E.S. Subdivislon Density and Dimension Calculations Jc-cal-subden 11/30/01 Calculation: I ?"'1 3 'l 2. ____ Gross horizontal area of the project site 'J, ii ---- Total submerged lands and rights-of-way Site area in square feet NOTE: To continue calculations, convert site area in square feet to acres by dividing by 43,560 Site area in acres NOTE: When calculating the site area for parcels in the RA Zone, if the site area should result in a fraction of an acre, the following shall apply: Fractions of .50 or above shall be rounded up to the next whole number and fractions below .SO shall be rounded down. Example: If the site area in acres is 19.5 acres (less the submerged land and less the area that is required to be dedicated on the perimeter of a project site for public right-of-way) the site area can be rounded up to 20 acres. No further rounding is allowed. (See K.C.C. 21A.12.080) II. Base Density (K.C.C. 21A.12.030 -.040 tables): The base density is determined by the zone designations(s) for the lot. du/acre ~ C. .<#> 111.& "f III. Allowable Dwelling Units and Rounding (K.C.C. 21A.12.070): The base number of dwelling units is calculated by multiplying the site area by the base density in dwelling units per acre (from K.C.C. 21A.12.030 -.040 tables). 3', /'-( site area in acres (see Section 1.) X __ 6 __ base density (see Section II) = __ 1_4 __ allowable dwelling units Except as noted below, when calculations result in a fraction, the fraction is rounded to the nearest whole number as follows: A. Fractions of .SO or above shall be rounded up; and B. Fractions below .50 shall be rounded down. NOTE: For parcels in the RA Zone, no rounding is allowed when calculating the allowable number of dwelling units. For example, if the calculation of the number of dwelling units equaled 2.75, the result would be 2 dwelling units. Rounding up to 3 is not allowed. (See K.C.C. 21A.12.070(E)). IV. Required On-site Recreation Space (K.C.C. 21A.14.1SO): This section must be completed only if the proposal is a residential development if more than four dwelling units in the UR and R zones, stand-alone townhouses in the NB zone on Subdivision Density and Dimension calculations lc-cal-subden 11/30/01 Page 2 of 6 property designated Commercial Outside of Center if more than four units, or any mixed use development if more than four units. Recreation space must be computed by multiplying the recreation space requirement per unit type by the proposed number of such dwelling units (K.C.C. 21A.14.180). Note: King County has the discretion to accept a fee in lieu of all or a portion of the required recreation space per K.C.C. 21A.14.185. Apartments and town houses developed at a density greater than eight units per acre, and mixed use must provide recreational space as follows: 90 square feet X proposed number of studio and one bedroom units --- 170 square feet X proposed number of two bedroom units + 170 square feet X proposed number of three or more bedroom units + Recreation space requirement ; Residential subdivisions, townhouses and apartments developed at a density of eight units or less per acre must provide recreational space as follows: 390 square feet X I 8 proposed number of units ; 7o2C -~ z. Mobile home parks shall provide recreational space as follows: 260 square feet X ___ proposed number of units ; V. Net Buildable Area {K.C.C. 21A.06.797): This section is used for computing minimum density and must be completed only if the site is located in the R-4 through R-48 zones and designated Urban by the King County Comprehensive Plan. The net buildable area is the site area (see Section I) less the following areas: + + + + + ; __ o __ areas within a project site which are required to be dedicated for public rights-of-way in excess of sixty (60') of width __ o __ sensitive areas and their buffers, to the extent they are required by King County to remain undeveloped areas required for above ground stormwater control facilities including, but not limited to, retention/detention ponds, biofiltration swales and setbacks from such ponds and swales __ 6 __ areas required by King County to be dedicated or reserved as on-site recreation areas. Deduct area within stormwater control facility if requesting recreation space credit as allowed by K.C.C. 21A.14.180 (see Section IV) 'fi\~ f'-t'E 1,-.i L'-'€. __ o=--regional utility corridors, and __ (1> __ other areas, excluding setbacks, required by King County to remain undeveloped 77,0 Total reductions Calculation: I J(:. q, 2. site area in square feet (see Sectionl) 7J)-c ; (J..Cj ·" 'L ' ; ---- Total reductions Net buildable area in square feet NOTE: convert site area is square feet to acres by dividing by 43,560 Net buildable area in acres Subdivision Density and Dimension Calculations lc-cal-subden 11/30/01 Page 3 of 6 + + + + + + + = = VI. Minimum Urban Residential Density (K.C.C. 21A.12.060): The minimum density requirement applies only to the R-4 through R-48 zones. Minimum density is determined by multiplying the base density in dwelling units per acre (see Section II) by the net buildable area of the site in acres (see Section V) and then multiplying the resulting product by the minimum density percentage from the K.C.C. 21A.12.030 table. The minimum density requirements may be phased or waived by King County in certain cases. (See K.C.C. 21A.12.060.) Also, the minimum density requirement does not apply to properties zoned R-4 located within the rural town of Fall City. (See K.C.C. 21A.12.030(B)12.) Calculation: 6 base density in du/ac (see Section II) X '-;, ? Net buildable area in acres (see Section V) 17, 8J'" X minimum density% set forth in K.C.C. 21A.12.030 or as adjusted in Section VII 6 '{ 7.,. ti,':( ~m dwelling units required 4~ VII. Minimum Density Adjustments for Moderate Slopes (K.C.C. 21A.12.087): Residential developments in the R-4, R-6 and R-8 zones may modify the minimum density factor in K.C.C. 21A.12.030 based on the weighted average slope of the net buildable area of the site (see Section V). To determine the weighted average slope, a topographic survey is required to calculate the net buildable area(s) within each of the following slope increments and then multiplying the number of square feet in each slope increment by the median slope value of each slope increment as follows: zc:,.,o,.,c sq. ft 0-5% slope increment X 2.5% median slope value = 5'00 ~"l~'w...'.l sq. ft 5-10% slope increment X 7.5% median slope value= 6.~-,.o + ;,@. a"" sq. ft 10-15% slope increment X 12.5% median slope value= :i 7S-O + I sq. ft 15-20% slope increment X 17.5% median slope value= -~ S""'.) "2£1 0 .J.;;.. + ) . 2,boc sq. ft 20-25% slope increment X 22.5% median slope value = l-:{JO + /cl e,-.=,,<J sq. ft 25-30% slope increment X 27.5% median slope value= 'Z,, 1 s-c + /6, ,:oo sq. ft 30-35% slope increment X 32.5% median slope value = ro?c + (j,,.,o sq. ft 35-40% slope increment X 37.5% median slope value = 2--~o.:, + /2.j fi<>O Total square feet 2.7 /80 Total square feet ) in net buildable area adjusted for slope Calculation: 2. () /80 = :,, 5 total square feet adjusted for slope divided by / 2 '1; ,a~ total square feet in net buildable area weighted average slope of net buildable area = ,,.3 % (Note: multiply by 100 to convert to percent -round up to nearest whole percent) Use the table below to determine the minimum density factor. This density is substituted for the minimum density factor in K.C.C. 21A.12.030 table when calculating the minimum density as shown in Section VI of this worksheet. Weighted Average Slope of Net Minimum Density Factor Buildable Area(s) of Site: 0% --less than 5% 85% 5% --less than 15% 83%, less 1.5% each 1 % of ~"e slooe in excess of 5% 15% --less than 40% (66%'.Jess 2.0% for each 1 % of /averaoe slooe in excess of 15% ~ Subdivision Density and Dimension Calculations 11/30/01 Page 4 of 6 EXAMPLE CALCULATION FOR MINIMUM DENSITY ADJUSTMENTS FOR MODERATE SLOPES: sq. ft 0-5% slope increment X 2.5% median slope value = + 10 000 sq. ft 5-10% slope increment X 7.5% median slope value= 750 + + 20 000 sq. ft 10-15% slope increment X 12.5% median slope value= 2 500 + + sq. ft 15-20% slope increment X 17.5% median slope value= + + sq. ft 20-25% slope increment X 22.5% median slope value = + + sq. ft 25-30% slope increment X 27.5% median slope value= + + sq. ft 30-35% slope increment X 32.5% median slope value = + + sq. ft. 35-40% slope increment X 37.5 % median slope value = + 30 000 Total square feet 3 250 Total square feet in net buildable area adjusted for slope 3 250 Total square feet adjusted for slope divided by 30,000 Total square feet in net buildable area = .108333 Weighted average slope of net buildable area = 11 % (Note: multiply by 100 to convert to percent -round up to nearest whole percent) Using the table above, an 11 % weighted average slope of net buildable area falls within the 5% --less than 15% range which has a minimum density factor of 83%, less 1.5% for each 1 % of average slope in excess of 5%. Since 11 % is 6% above 5%, multiply 6 times 1.5 which would equal 9%. Subtract 9% from 83% for an adjusted minimum density factor of 74%. This replaces the minimum density factor in K.C.C. 21A.12.030 table. VIII. Maximum Dwelling Units Allowed (K.C.C. 21A.12.030 -.040): This section should be completed only if the proposal includes application of residential density incentives (K.C.C. 21A.34) or transfer of density rights (K.C.C. 21A.37). Maximum density is calculated by adding the bonus or transfer units authorized to the base units calculated in Section III of this worksheet. The maximum density permitted through residential density incentives is 150 percent of the base density (see Section II) of the underlying zoning of the development or 200 percent of the base density for proposals with 100 percent affordable units. The maximum density permitted through transfer of density rights is 150 percent of the base density (see Section II) of the underlying zoning of the development. ____ base density in dwelling units per acre see (Section II) X 150% = maximum density ----maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density incentives (K.C.C. 21A.34) ____ base density in dwelling units per acre (see Section II) X 200% = maximum density ____ maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density incentives with 100 percent affordable units (K.C.C. 21A.34) ____ base density in dwelling units per acre (see Section II) X 150% = maximum density ----maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density transfers (K.C.C. 21A.37) Calculation: + + ----base allowable dwelling units calculated in Section III ----bonus units authorized by K.C.C. 21A.34 ____ transfer units authorized by K.C.C. 21A.37 ____ total dwelling units (cannot exceed maximum calculated above) IX. Minimum Lot Area For Construction (K.C.C. 21A.12.100): Except as provided for nonconformances in K.C.C. 21A.32: Subdivision Density and Dimension calculations lc-cal-subden 11/30/01 Page 5 of 6 x. A. In the UR and R zones, no construction shall be permitted on a lot that contains an area of less than 2,500 square feet or that does not comply with the applicable minimum lot width, except'for townhouse developments, zero- lot-line subdivisions, or lots created prior to February 2, 1995, in a recorded subdivision or short subdivision which complied with applicable laws, and; B. In the A, F, or RA Zones: 1. Construction shall not be permitted on a lot containing less than 5,000 square feet; and 2. Construction shall be limited to one dwelling unit and residential accessory uses for lots containing greater than 5,000 square feet, but less than 12,500 square feet. (K.C.C. 21A.12.100) Lot Width (K.C.C. 21A.12.0SO(B}): Lot widths shall be measured by scaling a circle of the applicable diameter within the boundaries of the lot as shown below, provided than an access easement shall not be included within the circle. (See K.C.C. 21A.12.050). I_. - ~ Lot Width Circle . -·-·-·-·-·-·-·-·-·-·-·-·-·-·-·- Lot Width Measurement Subdivision Density and Dimension Calculations lc-cal-subden 11/30/01 Page 6 of 6 October 24, 2003 Kim Clawsen King County DOES Re: Prelim Plat "A03P0286" "Soos Creek Plat" Dear Kim, There is a slight change to the preliminary plat pre-app submittal. We have added some additional property bringing the plat to 4.45 acres, thus we are now proposing a 25 lot plat (instead of 18). We have the Transportation Concurrencys for both properties totalling 25 lots, enclosed. Please forward this 11"x17" revised plat plan to the people doing the review of my proposed plat. The large CAD drawing is in work but will not be ready until we make the formal plat submittal. The pre-app meeting is scheduled for Tuesday Nov 4th and I hope they will have time to see this also. Sincerely /J //i7~ /t,.J"; .i'-<-~ Rick Boston 206-755-1617 '· C r1 t"· ._-. .. . J.t;. ::,, . -----. ,::_ ;' r-. \ -i ! I I ' ~ "!) 0 0 ~ "' s. "' :, .. ~ .., ... ... . ' ----~-. . . . . --~ '-..,, , "' " ' 0 ~~~ \ ! \ ' ~ e I ~ -0 1 lb l'PI ~ I _. . 1 r . ·-11: c,: ' : . \ I . , t ' t\" .~.:: : ;f t O ti\: ,~·-r c . .t'. f : 1 ' ' ' < C'\ ... ~, ~. I • 'l \ ·' ~ (i i; ;,; ~ ~'i!'I AJ ? " " I/ t, . .-.., II ~ '-i• ~ ' : " ,c ' /'') (',) l ) ., ( . ' r) '~ ,...._ ,, 0 --------- \ / II ~8 ~"'!, 120' ... ~e~ ~;:§ _.r··,1 (,.) ~ j Cl) E 9+"~ . _______ \-- ____ ; ___ 1.~d~ti-- ·---------- 1) ri ~~ ' G "ll 'f')1' \ l 17 ~ ' -./ I '"il e r.,, ;, I 1"1 -; -ls,/>; ( I Ii ,1 t't I • _ i "\lu \ . ('.') \ 0 ', --)1:. \_ \ t ~' \ 0 I ' ... .,. ;} "' ] "' a, } ~ -..../~ .¥: I I 1·;,.:;1':}.i(l• I '° 5 ' " " 10 -,.·J. I((; ',•~,I. :_.-., .•:.~ __ ·_'_' 6 , f Ntt -I I I, ' ' l f ····1 --1 ., " /~ // It // / (-/ I I I I I I I : I I \ \ \ \ \ \ \ uZ 1> 0, v ,i ~~ ~--~t 171 .,, " r 11 ~ ~ ~ 0 >" ' • -. ' ~ ~ )> D 0 )J -j =tju r•1 .::tJ Pl (/) < ~ !""Tl (/) )> r,1 z 0 )> -j .::'?: ( 6o •''.'! ·' lo r ( / }_ '"' ;::: (I- I) C, 0 \.,J o' 70 7 ..... -< (_,.J u (_,.J ' .. -"' )> -~ --1 < <',.f~}: •· ... ifl l 1>/-I ' ~ -..( u N (_,.J )J C) -a. ~2~-;.t-- ~r '1'.;:m a *" . .. ;, ' \ It;,/}, --•' ' /\'ii__ ~ , r I "I ./ "· ~ e •: <f' I . iJ'/ I : .. ,, 1 ~r-* ~ mt ;--_ 1,, _____ '\riih . ( _ . ,, -. ... -) , ~T 1 I ' . ' • .. . ' ..... ·.-. ' -,.,.--- '" ' ~. ;,;5' l>i r ,_ -------'" ,.;_i __ ·r _ _ ~ ~ -._m __ \ __ . ~f-f-·;;i2:1~w1 \.·"1!-q· '\II~ !i -0 0 ~ ~ ~ 0 .,t::. (.]11 i r,1~ L~ g. /' ... -------i ...., f\ ~ ct· ~\ DRA\IN BY: ~ DESIGN BY: ~ ENGINEERING BY: ~ CHECKED BY: ~ ,2;.-----··1 t c, Fi! II~ \ # i ,0 -i_ -~-\ 1'!-----1, i \ ' " .. ,_,I : 11. i 11. " I ! k R.13RIIJKMAN R. BOSTON N. JACQUES ,,,. ) .. ~ !! ll! il 'ii 'iljj ; h 5l i SOOS CF:EEI< ,SLOT 1=11 AT 8 & 104' • " ~ Jacques Consulting ~ & i ~ D[~Lc+'£R 'I, .. .. -., ';. ';. D <> Ii' " o*r:;.; ;rj :rj C) rn rn ITl f"T'1 IT'l Z ooo 0 0 n " a.: ~ C 0 o -2-c -"', Boston Design and = r-, ';;,-REVISION: 0 !e. 191c:0IJE1H1l,·)I~ Sf: Tox I; # 51 :J~OO -OL/30 Neal Jacques P[ 25JJ SW I 6J r)!oce. Burien, WI\ 98 I 65 Phone 206-242-5322 25 F LokPfokttirm.Vs@frltn,J,,w; 98059 P/10r:e 42.5-220--2115 Pat 425-228-355J ________ _L _____ _ --·- ~·· -~·~- r/~;:>-~---<~~;-· ---------------------------------------~ :#' / ''4~}~' \'t l~~:;:)l K~t.!9 (CH.,.HTt}-' Road Services Division Department of Transportation KSC-TR-0313 201 South Jackson Street Seattle, WA 98104-3856 TYPE OF CERTIFICATE 12:] ORIGINAL 0 CONDITIONAL February 7, 2003 Certificate # 01461 File Number: 03-01-23-01 Exnires: Februarv 7. 2004 CERTIFICATE OF TRANSPORTATION CONCURRENCY 0 Specific conditions are described no the reverse side of this certificate. Pwsuant to King County Code, Chapter 14.70 as amended, this certificate confirms that the level of service standard used in the Transportation Concurrency Management program has been satisfied and sufficient road capacity is reserved for the development project described below. IMPORTANT: This certificate does not guarantee a development permit. Other transportation improvements and mitigation will be required to comply with Intersection Standards, Mitigation Payment System, King County road standards, and/or safety needs. l. Applicant Name and Address: Richard Boston, Boston Design & Development, LLC 13425 E Lake Kathleen Drive SE, Renton, WA 98059 2. Property Location: a. Property Address: 124th Avenue SE & SE 192nd Street b. Development Name: c. Parcel Nwnber: 6199000260 3. 'fype of Development Permit To Be Requested: Fonnal Plat 4. Proposed Land Use: Single Family Residences 5. Zone Location and Reserved Units: a. Concurrency Zone: 799 Community Planning Area: Soos Creek i. Commercial Project -Total Square Feet: 0 ii. Multi-family -Number of Units: 0 iii. Single :ramily -Nwnber of Units: 19 6. This Certificate is subject to the following general conditions: a. This Certificate of Concurrency runs with the land and is transferable only to subsequent owners of the same property for the stated development, subject to the terms, conditions and expiration date listed herein. This Certificate of Concurrency is not transferable to any ·other property and has no commercial value. This Certificate Expires: February 7, 2004 unless you apply for the development permit described above, prior to that date. If this requirement is not met the King County Department of Transportation reserves the option to cancel your certificate and capacity reservation. When you apply for a development pennit with King County's Department of Development and Environmental Services (DDES). bring this Certificate of Transportation Concurrency as part of the development application package. If you have any questions, please call (206) 263-4722. ~:~A=-- Linda Dougherty, Manager, Road Service(J Department of Transportation King Co\Ulty, Washington t· i ·1' l~f .. ,, ·~ ,,. !A ... I-' p !"' ' lr-lfll' .:;1 .~:fdA-u!II ~ I ,. l t I f ,. I I I !I ~ Ii l! 11 i I 1J;rt i i ; l, ' II It:, ---- 1 l~1, · '!Ii' t ~ if !I l .I ,I. 1[ i!! ~B!I •. ..r-1 18 I pf i · 1 • 1 r Q ·t r ~ l I I I I f l l f -.. . M Mi Sc L A03P0287 RIGHT OF WA. NTrails ! Schools/School Facilities N1ownst;p Lines S-T-R /v'~21~~:s ~WPLINES Road Rights-of-Way N Streets Water Bodies Parce's Cities [:]Parks Zoning A-10 -Agflcultural. one DU per 10 acres • A-35 -Agricultural, one DU per 35 acres • F-Forest M -Mineral RA-2.5 -Rural Area. one DU per 5 acr es RA-5 -Rural Area. one DU per 5 acres RA-1 0 -Rural Area. one DU per 10 acres UR -Urban Reserve, one DU per 5 acres R·1 • Residential, one DU per acre R-4 -ResldenUal, 4 DU per acre R-6 -ResldenUal. 6 DU per acre R-8 -Resldenttal. 8 DU per acre R-1 2 -Resldenllal, 12 DU per acre R-18 -Resldenttal, 18 DU per acre iii R-24 -Residential, 24 DU per acre • R-48 -Resldenl1al, 4 8 DU per acre N B -Neighborhood Business • CB -Community Business ~ RB -Regional Business • 0-0ffice I -lndustr1al N City Boundaries 0 100 1·= 200 feet 200 Feet ® King County The inlormaOon inc:tuded on thit map has been ~ilad Dy KJng County staff from a vlMty of toUrt::eS ald le aJbtect to cha~ '*"lhout notlct. King Courty make3 no teP'eMntahone or wwurcles . express ot Implied, as IO the eco..racy. ~lieness. UmeHness. or right$ to It. UN of such intormahon .. King County s~ nol be ll.ablt tor •rrt general. spec1el, 1f'ldifecl. lnckieri:«. Of coneequerclal dafNION induding, but not llmtted lo, lost ,..lle!'YJeS 0( k>st ~t• resulting from lhe uee or mlsuee of the lrlormalion conlained on this map. Asrf Nie of this map or Wormation on ths map is P'Ohibited excepl by written permission ot King °'""Y Plot date: Oct 16 , 2003 ; llddesll011x0 1\gis\av_devlprojectslbase2.ap< N --, A03P028 I 1998 MA N rownstr.p Lines S-T-R /\/ QSLINES ~SECLINES '/'(/TWPLINES N Streets Water Bodies Parcels CIHes LandsNde Hazard Level 2 Areas DA LND Area 5pec1nc Flow Control Requirements Level 1 FC Area -Level 2 FC Area -Level 3 FC Area Basin-wide Flow Control Requirements c:::J Level 1 FC Area C] Level 2 FC Area N C1tyBound8'les 1·• 500teet 400 Feet ® King County The 1nl'ormatl0n included on th:• rmip hea been ~ by Kif9 County Slaff from a variety Qt tourcfl .-v:I is IIJbie(:t. lo charge withOut rctice King C.OUnty ~• no rei;nsen1aoo,-or wa-r-ert,ea, exprea or irnpfied, as lo lhe .x;u-eq, cx::wnpe19,....._ l~lf'IHS, 01 righll lo lhe UM of -,ch Wom'llllion. King Counry shlil not btl liable for 11ny general, speclal. ind.-.ct, ircldef'UI , or conse,quertlal damages inc:ludirlg , bu! no< li,,..ed &o, lost revenues or los! p-dltli reUt;ng from the u98 oc rriSUN of tt. l~orrnalion OOfl(elned on thsl map. Any sale of I his map or inf'ormatOO on 1h11 map Is pront,i!ed exoepl by written perrrission of Klng Couriy. Plot date: Oct 18, 2003: llddes001\x01 \gislav_devlptoJects\base2.apr A03P0287 1998 MANUAL N rc:mnship Lines S-T-R /\/OSLINES ~SECLINES '/li;/TWP LI NES N Streets Bogs Water Bodies Parcels Cities §BOG DA oww ~ Sole Source Aquifer Atea Speclnc Water Quality Requirements Basic WO Treatment Areas (TA) -Semltive Lake TA -Reglonally Sign ificant Stream TA Basin-wide Water Quality R~irements D Basic WO TA c:::J Sens atlve Lake TA N City Boundaries 0 500 1000 1SOO Feet t "= 1333 feet ® King County The 1nlormt1lJon 1n:;tuded on lhi8 mtrp has been co,'l)iled by Kl~ County lteff lrom • v...ty of IOIIOM and ti SI..Cjeci to change without notg_ King Counly mak4os no reprnent,tlons Of' w.arn1ntlea. express or implied, • lo the aco .. ncy, cornpJeter'4N, ti"*lnns. or right• to tM UM ot 9JCh information. King Co.rri:y at\111 r.::,t be li.llbte lor 8"f gentral, speclal, lndireet. Incidental, or <X>r'lt8qVl!nli.i dflfflll94t• rdOdir-.;i, but noc lm1ad to, lo:ft ~• or km p-ditl rHUling from the u• or rft9JM of the i rt~lion j contained on ll'lb map. Ally •• of this map or inlorma(,on Lr on lt'151 map ia s:,tOhibiled except b y written pennr9lltOn of Cour<y Plot date: Oct 16, 2003; llddesoo1 1,co11g1s1av_dev\projects\base2.apr Comcast Webmail -Invoice from Superior NW Tree & Shrub Care, Inc ("Superior NWT... Page 1 of I @omcast From: "Superior NW Tree & Shrub Care. Inc" <superior_nw@comcast.net> To: brucewhitt@comcast.net CC: superior_nw@comcast.net, joe@superiornw.com, anthony@superiornw.com, joe-suzi@comcast.net Subject: Invoice from Superior NW Tree & Shrub Care, Inc Date: Sunday, October 08, 2006 8:24:20 PM Dear Bruce: Thank you for your business! We appreciate it very much. Sincerely, -Joe Joseph H. Smith, B.S. Field Consultant Superior NW Tree and Shrub Care, Inc. 206-819-2396 (Cell) joe@superiornw.com Anthony Moran, B.S, ISA Certified Arborist anthony@superiornw.com To view your invoice Open the attached PDF file. You must have 8~robat® Reader® installed to view the attachment. (Attachments successfully scanned for viruses.) Attachment 1: (application/octet-stream) http://mailcenter3.comcast.net/wmc/v/wm/454622EBOOOA354FOOOOO IC 122165499769 .. . I 0/30/2006 - ® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 July 20, 2006 Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 Loma Taylor TEC, Inc. 205 Front Street South/P.O. Box 1787 Issaquah, WA 98027 RE: Fleuves des Voiles Subdivision 1998 KCSWDM Adjustment Request (File No. L06V0040) Dear Applicant and Engineer: The Land Use Services Division, Engineering Review Section, has completed review of the adjustment request for the Fleuves des Voiles subdivision. You are requesting approval for an adjustment from the 1998 King County Surface Water Design Manual (KCSWDM) Core Requirement No. I, Section 1,2.1, Discharge at the Natural Location and Core Requirement No, 3, Section 1.2.3, Flow Control. You are also requesting approval for an adjustment to utilize an off-site storm water facility and formalize its shared use through Special Requirement No. I, Section 1.3.1, Shared Facility Drainage Plans with the Shared Facility Plan Guidelines published in a memo dated September 15, 1999. Our review of the information and a site visit provides the following findings: 1. The proposed Fleuves des Voiles subdivision is located at 12216 SE 192nd Street. The 39 lot. 6.74 acre, proposed Fleuves des Voiles subdivision is undergoing preliminary approval under Land Use Services Division (LUSD) file number L04P0002, The Feuves des Voiles subdivision will be dedicating a separate tract to King County for the combined shared facility. 2. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040. 3. The subdivision and short plat are both located in the Upper Soos sub basin of the Soos Creek basin. The upper and lower portions of the Fleuves des Voiles site are subject to the Level Two and Level One flow control, respectively, and Basic water quality requirements of the 1998 KCSWDM. The Cogger short plat is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. Fleuves des Voiles/L06V0040 July 20, 2006 Page 2 of 4 4. The combined, irregularly-shaped site slopes moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192"d Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. 5. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192"d Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. Nuisance flows to adjoining residential properties would be largely eliminated. 6. No decorative ponds or shallow wells have been identified that would be affected by the proposed diversion. 7. Because the Fleuves des Voiles site is split between Level One and Level Two flow control, the proposal is to also allow the Level One flow control requirement to prevail due to the location and release point of the proposed facilities. When viewing the Fleuves des Voiles project on its own, this issue is not an adjustment issue and has been allowed as proposed based on previously established interpretation and policy. However, the implied request to allow the Cogger short plat to also utilize the Level One flow control criteria given its vesting to the 2005 KCSWDM, is an adjustment issue. 8. The Conservation Flow control standard (Level Two and preforested conditions) defined in the 2005 KCSWDM has become the default flow control standard to protect the environment of and allow for the restoration of water quality or habitat functions essential to salmonids. Because the 1998 KCSWDM Level One flow control standard is not equivalent to this upgraded standard, the Cogger short plat will not be allowed to utilize the Level One flow control standard. Mixing the two flow control requirements together can be accomplished with the KCRTS methodology. 9. The proposal is to also officially acknowledge the accommodation of the Cogger short plat into the shared facility design of the off-site Fleuves des Voiles storm water facility. The same applicant controls both developments and has indicated that both developments and the shared facility will be constructed concurrently since the short plat is also dependent on the plat for its access and recreation space. 10. Blanket adjustment L05V0067, signed 11/3/05, allows the use of StorrnFilter 360 cartridge filter catch basins for projects vested to either the 1998 or 2005 KCSWDM. Fleuves des Voiles/L06V0040 July 20, 2006 Page 3 of4 The blanket adjustment defines the limits of use and design criteria to be utilized when using this type of facility. 11. The Level One Drainage Analysis identified no restrictions or problems associated with the proposed discharge locations. 12. A consolidation of facilities for the proposed subdivision will be more economical in long term maintenance. Based on these findings, we hereby approve this adjustment to I) allow the diversion of runoff to two separate stormwater facilities near the north and south ends of the combined site, and 2) utilize the shared facility plan concept to allow combining the Cogger short plat into the northern stormwater facility, but 3) deny the Cogger short plat from utilizing the Level One flow control standard due to lack of equivalency, with the following conditions: I. The release rates for the detention facilities will be based on the entire tributary area being directed to the facilities. 2. The volume for the detention facilities will be based on all flows directed to the facilities at full development under current zoning. The allowed release rate will be reduced by any undetained flows that would bypass the proposed subdivision drainage facilities. The detention volume shall be sized using the Level One flow control standard in the 1998 KCSWDM for the Fleuves des Voiles plat and the Conservation flow control standard in the 2005 KCSWDM for the Cogger short plat. The design Technical Information Report shall state the factor of safety selected and the basis of that determination. 3. Water quality facilities must be sized based on the entire proposed subdivision draining to the facilities including any required frontage improvements. 4. All onsite or offsite drainage facilities must be located in a public right-of-way, recreation space tract with easement or storm drainage tract dedicated to King County. 5. The developer of the shared facility is responsible for any cost sharing agreements that may be set up as part of the implementation of the shared facility plan. 6. Engineering plans for the Cogger short plat shall note this approved facility plan. 7. Additional storm drainage requirements identified by SEP A or the plat hearing review will apply to this project. The applicant retains all rights and privileges afforded in Section 1.4. If you have any further questions regarding this KCSWDM adjustment or the design requirements, please contact Mark Bergam at (206) 296-7270. Fleuves des Voiles/L06V0040 July 20, 2006 Page 4 of 4 Sincerely, James Sanders, P.E. Development Engineer Engineering Review Section Land Use Services Division Jim Chan, P .E. Supervising Engineer Site Engineering and Planning Section Building Services Division cc: Curt Crawford, P.E., Managing Engineer, Stormwater Services Section, KCDNR Bruce Whittaker, Engineer III, Engineering Review Section, LUSD Chad Tibbits, Project/Program Manager II, Current Planning Section, LUSD Mark Bergam, P .E., Engineer III, Engineering Review Section, LUSD ® King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, Washington 980S5-1219 Surface Water Design Manual Requirements / Standards Adjustment* Request Project Name: fiev..vc. des Vo; /es Pia.J-- AN D Co ev SJ.\O,+ Pk+ Project Address: / 2 2-1 (p £(:c'. I~ DOES Project File No.: LD'-f 0002 L055004 0 I DOES Engineer/Planner Name: B"uce \J,i Hakeir I Cha.d Ti bb;+5 Phone: I-141 Date: 3, 2J o& Please be sure to Include all plans (T.I.R, if avallable), sketches, photos and maps that may assist in complete review and consideration of this adjustment request. Failure to provide all pertinent information may result In delayed processing or denial of your request. Please submit tvlo complete copies of this request, application form and applicable fee to the ODES Intake Counter, at 900 Oakesdale Avenue Southwest, Renton, Washington 98055-1219. For additional information, phone Randall Parsons, P.E., at (206) 296-7207. RD'RR 'l'O SJ:CTI0111 1. 4 IN CIIAP'rD. l or THE S1JRJ'ACl!: IO.TllR Dl:8IGIN MANUAL POR ADJt7S'l1IDIT8 DESCRIPTION OF ADJUSTMENT REQUEST: ~ Standard D Complex D Experimental D Blanket D Pre-applicaUon .,.. 11 _ h ,-1 .:.( e a..-nce c e v1 APPLICABLE VERSION KCSWDM: D 1990 (11195) • jl(1998 (9198) }l(: ZQQ5 • (Note: the term "variance" replaced by "adjustmenr) APPLICABLE SECTION(S) OF STANDARDS: /l Lore Co-re JUSTIFICATION PER KCSWDM SECTION 1.4.2 )!\ See attachments listed below. AUTHORIZATION SIGNATURES: DETERMINATION: D Approva! 'I!/, Conditional Approval (see below) [] DNRIWLRD Approval Signed: ---,h--ll--:a,,,_-7'9'-- D Denial DDES Staff Recommendation Signed: ~~~~~~a~tes: =~Q~~~------J Conditions of Approval: See attached Memo Dated: DDES, Bldg. Serv. Div., Site EnglnHring & Planning Supervisor: Signed: K.C. D.D.E.S. Justification per KCSWDM Adjustment Request: Adjustment No.L06V0040 June21,2006 Following are 4 standard adjustments required for the proposed drainage detention system proposed for the Fleuve des Voiles Plat Application L04P0002 and Cogger Short Plat Application L05S0040. 1. Standard adjustment to 2005 Manual Core Regujrement #1, Discharge at the Natural Location. The project proposes to discharge project runoff to the Soos Creek wetland slightly north (upstream) of the natural location. It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable because strict compliance with Core Requirement # 1 would result in discharge to the neighboring backyards creating an unacceptable situation for the adjacent property owners. 2. Standard adjustment to 2005 Manual Core Reguirement #1, Discharge at the Natural Location. The project proposes to discharge runoff from 124th Avenue SE to the Soos Creek wetland at 19znd Street, slightly south (downstream) of the natural location. It is impossible to provide treatment of runoff and retain the existing sheet flow discharge condition along the entire east side of the roadway because the edge of the roadway is at the property line and the neighboring property owner (King County Parks Department) so far will not gr.mt a drainage easement for discharge of this runoff. 3. Standard adjustment to 2005 Manual Core Regujrement #3, Flow Control. The project proposes to use Level 1 detention criteria for the entire site. The project site contains both Level 2 and Level 1 detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level 1 detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. 4. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stonnwater is a logical extension of this concept. Note on all adjustment requests: The Fleuve des Voiles Plat is vested under the 1998 KCSWDM and the Cogger Plat must comply with the 2005 KCSWDM The existing site runoff calculations used for sizing the detention system comply with the 2005 Manual requirements for Cogger and the 1998 Manual requirements for Fleuve des Voiles. This means that the Cogger Short Plat area was modeled as fully forested for the existing conditions. The pond itself complies with the requirements of2005 KCSWDM. J ~••~jr.: ,-c,·'- 1tl ~~ ' EXISTING SITE: FOREST: 303,801 (6.97) BUILDING: 1,364 {0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) TOTAL: 334,208 (7.67) 1 ; \ i N EB '-, \ \ \ \ \ LEU~ DES· VOILES\ .-~-m-\c± 0 I 1;, , SCALE: I" ~ '..(';_ "• \ \ \ \ 150 : 150 fl ( ® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 July 20, 2006 Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 Loma Taylor TEC, Inc. 205 Front Street South/P.O. Box 1787 Issaquah, WA 98027 RE: Fleuves des Voiles Subdivision 1998 KCSWDM Adjustment Request (File No. L06V0040) Dear Applicant and Engineer: The Land Use Services Division, Engineering Review Section, has completed review of the adjustment request for the Fleuves des Voiles subdivision. You are requesting approval for an adjustment from the 1998 King County Surface Water Design Manual (KCSWDM) Core Requirement No. 1, Section 1.2.1, Discharge at the Natural Location and Core Requirement No. 3, Section 1.2.3, Flow Control. You are also requesting approval for an adjustment to utilize an off-site storm water facility and formalize its shared use through Special Requirement No. I, Section 1.3.1, Shared Facility Drainage Plans with the Shared Facility Plan Guidelines published in a memo dated September 15, 1999. Our review of the information and a site visit provides the following findings: I. The proposed Fleuves des Voiles subdivision is located at 12216 SE 192nd Street. The 39 lot, 6.74 acre, proposed Fleuves des Voiles subdivision is undergoing preliminary approval under Land Use Services Division (LUSD) file number L04P0002. The Feuves des Voiles subdivision will be dedicating a separate tract to King County for the combined shared facility. 2. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision. The 8 lot, 0. 93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040. 3. The subdivision and short plat are both located in the Upper Soos subbasin of the Soos Creek basin. The upper and lower portions of the Fleuves des Voiles site are subject to the Level Two and Level One flow control, respectively, and Basic water quality requirements of the 1998 KCSWDM. The Cogger short plat is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. Fleuves des Voiles/L06VOu40 July 20, 2006 Page 2 of 4 4. The combined, irregularly-shaped site slopes moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. 5. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192nd Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. Nuisance flows to adjoining residential properties would be largely eliminated. 6. No decorative ponds or shallow wells have been identified that would be affected by the proposed diversion. 7. Because the Fleuves des Voiles site is split between Level One and Level Two flow control, the proposal is to also allow the Level One flow control requirement to prevail due to the location and release point of the proposed facilities. When viewing the Fleuves des Voiles project on its own, this issue is not an adjustment issue and has been allowed as proposed based on previously established interpretation and policy. However, the implied request to allow the Cogger short plat to also utilize the Level One flow control criteria given its vesting to the 2005 KCSWDM, is an adjustment issue. 8. The Conservation Flow control standard (Level Two and preforested conditions) defined in the 2005 KCSWDM has become the default flow control standard to protect the environment of and allow for the restoration of water quality or habitat functions essential to salmonids. Because the 1998 KCSWDM Level One flow control standard is not equivalent to this upgraded standard, the Cogger short plat will not be allowed to utilize the Level One flow control standard. Mixing the two flow control requirements together can be accomplished with the KCRTS methodology. 9. The proposal is to also officially acknowledge the accommodation of the Cogger short plat into the shared facility design of the off-site Fleuves des Voiles stormwater facility. The same applicant controls both developments and has indicated that both developments and the shared facility will be constructed concurrently since the short plat is also dependent on the plat for its access and recreation space. 10. Blanket adjustment L05V0067, signed 11/3/05, allows the use of StormFilter 360 cartridge filter catch basins for projects vested to either the 1998 or 2005 KCSWDM. Fleuves des Voiles/L06VOv40 July 20, 2006 Page 3 of 4 The blanket adjustment defines the limits of use and design criteria to be utilized when using this type of facility. 11. The Level One Drainage Analysis identified no restrictions or problems associated with the proposed discharge locations. 12. A consolidation of facilities for the proposed subdivision will be more economical in long term maintenance. Based on these findings, we hereby approve this adjustment to 1) allow the diversion of runoff to two separate stormwater facilities near the north and south ends of the combined site, and 2) utilize the shared facility plan concept to allow combining the Cogger short plat into the northern stormwater facility, but 3) deny the Cogger short plat from utilizing the Level One flow control standard due to lack of equivalency, with the following conditions: I. The release rates for the detention facilities will be based on the entire tributary area being directed to the facilities. 2. The volume for the detention facilities will be based on all flows directed to the facilities at full development under current zoning. The allowed release rate will be reduced by any undetained flows that would bypass the proposed subdivision drainage facilities. The detention volume shall be sized using the Level One flow control standard in the 1998 KCSWDM for the Fleuves des Voiles plat and the Conservation flow control standard in the 2005 KCSWDM for the Cogger short plat. The design Technical Information Report shall state the factor of safety selected and the basis of that determination. 3. Water quality facilities must be sized based on the entire proposed subdivision draining to the facilities including any required frontage improvements. 4. All onsite or offsite drainage facilities must be located in a public right-of-way, recreation space tract with easement or storm drainage tract dedicated to King County. 5. The developer of the shared facility is responsible for any cost sharing agreements that may be set up as part of the implementation of the shared facility plan. 6. Engineering plans for the Cogger short plat shall note this approved facility plan. 7. Additional storm drainage requirements identified by SEPA or the plat hearing review will apply to this project. The applicant retains all rights and privileges afforded in Section 1.4. If you have any further questions regarding this KCSWDM adjustment or the design requirements, please contact Mark Bergarn at (206) 296-7270. Fleuves des Voiles/L06VOu40 July 20, 2006 Page 4 of 4 Sincerely, James Sanders, P.E. Development Engineer Engineering Review Section Land Use Services Division Jim Chan, P.E. Supervising Engineer Site Engineering and Planning Section Building Services Division cc: Curt Crawford, P.E., Managing Engineer, Stormwater Services Section, KCDNR Bruce Whittaker, Engineer III, Engineering Review Section, LUSD Chad Tibbits, Project/Program Manager II, Current Planning Section, LUSD Mark Bergam, P.E., Engineer III, Engineering Review Section, LUSD ® King County Deptrtment of Development and Environmental SeTVlcu 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Surface Water Design Manual Requirements/ Standards Adjustment* Request Project Name: fi e\A.VC cJeS Vo; (e.$ p /a. t- A/\1 D Co e,r St--orf-Pk+ Project Address: 122..1 (p Se: 1qz..,_J Sf. ~ DDESProjectFileNo.: LD'I OOD2 L05SOO"i0 J ODES Engineer/Planner Name: Phone: I-IYIS" Date: 328 or., Please be sure to Include all plans (T.l. R., If available), sketches, photos and maps that may assist in complete review and ca,s/deration of this adjustment request. Failure to provide all pertinent information may result In delayed processing or denial of your request. Please submit two complete copies of this request appUcation form, and applicable fee to the DOES Intake Counter, at 900 Oakesdale Avenue Southwest, Renton, Washington 98055,,1219. For additlonal infonnation, phone Randall Parsons, P .E., at (206) ~7207. RDBR 'lO SECTION 1,, IR Cl!AP'l'J:R 1 OP 'l'Bll Stnll'ACII WATlllt DIISIQIII lllU<IUAL POlt ADJIJSTMIIIITS DESCRIPTION OF ADJUSTMENT REQUEST: w Standard D Complex D Experimental D Blanket D Pre-application -,c-LJ. 1 . ,-1 .c.fe a.,qc::..cnev1 APPLICABLE VERSION KCSWDM: D 1990 (11/95) • ,il(1998 (9/98) )a -Z.0Q5 • (Note: the tem, "variance' replaced by "adjustmenr) APPLICABLE SECTION($) OF STANDARDS: /I Lo•e JUSTIFICATION PER KCSWDM SECTION 1.4.2 ~ See attachments listed below. AUTHORIZATION SIGNATURES: DETERMINATION: (__ o-re. D Approva) y. Conditional Approval (see below) D Denial D DNR/WLRD Approval Signed: -h--R~A-cA'---Date:----- DOES Staff Recommendation Signed: Conditions of Approval: See attached Memo Dated: ., Englneertng Review Supervisor: ate: DOES, Bldg. Serv. Div., Sita Engineering & Planning Supervisor: Signed: K.C. D.D.E.S Justification per KCSWDM Adjustment Request: Adjustment No.L06V0040 June 21, 2006 Following are 4 standard adjustments required for the proposed drainage detention system proposed for the Fleuve des Voiles Plat Application L04P0002 and Cogger Short Plat Application L05S0040. 1. Standard adjustment to 2005 Manual Core Requirement #1, Discharge at the Natural Location. The project proposes to discharge project runoff to the Soos Creek wetland slightly north (upstream) of the natural location. It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable because strict compliance with Core Requirement # 1 would result in discharge to the neighboring backyards creating an wiacceptable situation for the adjacent property owners. \~ 2. Standard adjustment to 2005 Manual Core Requirement #1, Discharge at the Natural Location. ~~/ The project proposes to discharge runoff from 124t11 Avenue SE to the Soos Creek wetland at 192"d Street, slightly south (downstream) of the natural location. It is impossible to provide treatment of runoff and retain the existing sheet flow discharge condition along the entire east side of the roadway because the edge of the roadway is at the property line and the neighboring property owner (King County Parks Department) so far will not grant a drainage easement for discharge of this runoff. 3. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. The project proposes to use Level 1 detention criteria for the entire site. The project site contains both Level 2 and Level 1 detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level 1 detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. 4. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stormwater is a logical extension of this concept. Note on all acijustment requests: The Fleuve des Voiles Plat is vested under the 1998 KCSWDM and the Cogger Plat must comply with the 2005 KCSWDM The existing site runoff calculations used for sizing the detention system comply with the 2005 Manual requirements for Cogger and the 1998 Manual requirements for Fleuve des Voiles. This means that the Cogger Short Plat area was modeled as fully forested for the existing conditions. The pond itself complies with the requirements of 2005 KCSWDM , .o'" /·t~, J i ~"'·7,: .ii' _,_ __ (. :,,·~·:,,: L _; j l l EXISTING SITE: FOREST: 303,801 ( 6. 97) BUILDING: 1,364 (0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) TOTAL: 334,208 (7.67) ~--·,·-~· N EB 0 I \ SCALE: 7J; : ,· \ \ LEU'{ DES VOILES\ \ \ a.': \ \ \ 150 : 150 ft. ® King County Department of Development and Environmental Services Land Use Services Division Web date: 09/13/2005 DROP-OFF COVER SHEET FOR LUSD ONLY 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296--6600 TIY 206-296-7217 For alternate formats, call 206-296-6600. Drop-Off Cover Sheet for Land Use Services Division ••••••••••••••••• IMPORTANT••••••••••••••••• PROJECT NUMBER AND NAME IS NECESSARY DATE RECEIVED BY LUSD FOR ALL DROP-OFFS Project No L004P0002; LOSS0040; KCSWDM Adjust. #L06V0040 Project Name Fleuve des Voiles Plat Cogger Short Plat fR1 fE (C fE ~ ~ ~ In, JUN 2 1 2006 /.Y FROM Ravenna Development, Charles Spaeth, Applicant Company Name / Contact Person Telephone No _2~06~-5~2~6--84~8_1 _________ _ TO Mark Bergam ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Short Plat , Plats Please specify item(s) dropped-off: Lot Line Adjustment Permit Please specify item(s) dropped-off: Right of Way Pennit Please specify ttem(s) dropped-off: Clearing/ Grading Permit -Additional information requested. Please specify item(s) dropped-off: Other: K.C. 0.D.E.S. Response to DDES (Chad Tibbtts) 5/11/06 Request for additional information, specifically as it relates to Drainage Adjustment RequestL06V0040 PLEASE NOTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything. As$istance in finding a project number can be provided by speaking to a Zoning/Land Use Technician. Your cooperation is important. Thank you. Check out the DDES Web site at www.metrokc.gov/ddes KC Drop-OffCoverSheet-LUSDOnlyFORM lg-<:vs-<lropoff.pdf 09113/2005 Page 1 of 1 Ravenna Development LLC / Charles Spaeth 6839 Ravenna Ave. NE, Seattle, WA 98115 206-526-8481 I (fax) 206-526-5939 cshaffercorp(alatt. net June 21, 2006 MarkBergam Senior Engineer, Engineering Review Section Land Use Services Division Dept. of Development and Environmental Services 900 Oakesdale Ave. SW Renton, WA 98055 Re: 1998 KCSWDM Adjustment No. L06V0040 relating to: Cogger Short Plat: LUSD File No. 10580040 and Fleuve des Voiles Preliminary Plat: LUSD No. L04P0002 Dear Mr. Bergam, This Jetter and its enclosure are in response to Chad Tibbit's May 11, 2006 request for additional information for the Cogger Short Plat and the Fleuve des Voiles Preliminary Plat (both enclosed). The second bullet point of each of these requests relates to the KCSWDM Adjustment referenced above that you are reviewing. The ODES bullet point is in italics. My response is in bold. Drainage/Roads: Second Bullet Point: The routing of the 1241h Ave. SE (drainage) out to SE J 9?4 St. constitutes a change in the natural discharge location. Please add this issue to the adjustment request that is pending. This should be accomplished by contacting Mark Bergam at 206-296-7270. This issue has been added to the Drainage Adjustment request as item #2 of the enclosed revised "Justification" dated June 21, 2006. Please let me know what other information you may require. Sincerely, Ravenna Development LLC __a-.,~a z,~7r::_ Charles Spaeth, Manager Bergam, Mark From: Sent: To: Whittaker, Bruce Friday, June 16, 2006 9:16 AM Bill Taylor Cc: Gillen, Nick; Bergam, Mark; Tibbits, Chad Subject: RE: Fleuve de Voiles -L04P0002 Bill, Page 1 of 1 I support and agree with Nicks' concept at the outlet, but this should be a evaluated with the proposed surface water adjustment L06V0040. This issue of concentrated flow at the property line is one of the elements of the adjustment request. I will forward this to Mark Bergam, who is reviewing the adjustment request. Please coordinate with Mark on this issue. Thanks, Bruce W From: Bill Taylor [mailto:btaylor@teccivil.com] Sent: Thursday, June 15, 2006 3:26 PM To: Whittaker, Bruce Cc: De-En Lang; Charles Spaeth Subject: Fleuve de Voiles -L04P0002 Hi Bruce, We want to confirm a situation for the Fleuve de Voiles project that has been a topic of discussion in-house. Our storm drainage discharge from the detention/treatment ponds was originally designed/presented as KC standard dispersion trenches at a certain setback from the property line. This was to model the existing condition and develop sheet flow for any surface runoff that might make it to the property line. I believe that under this circumstance that no drainage easement is required of the neighbor. At some point in the review process (you may recall) Nick Gillen made the request to provide rock gabion lined discharge pits in-lieu of the standard dispersion trenches for stormwater discharge. The question is ... Does this change anything regarding the potential need for easement from the neighbor? The intent is still to facilitate sheet flow at the property line. I understand that Nick's concerns were that the standard dispersion trench generally fails to disperse the runoff after time and settlement, more so than does this gabion lined pit. Please confirm that no easement will be required of the neighbor for the currently designed stormwater discharge from the pond. Thanks, Bill Taylor TEC, Inc. 425-391-1415 06/19/2006 King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton, Washington 98055~1219 'lat Screening Transmittal rreliminary Short Plat Applica .. ~n for Cogger LUSD File No. L05S0040 Date of Information Request: May 11, 2006 Deadline for Submittal of Information: August 11, 2006 Please provide ten (10) copies of the following, unless otherwise noted. Drainage/Roads: • The conceptual drainage plan shows a conveyance system for the 124111 Ave SE road improvement. Please revise the conceptual plan to address the stormwater detention and water quality requirements of the SWDM. Please include a detail of the proposed water quality design. Q The routing of the 124111 Ave SE out to SE 192"d St constitutes a change in the natural discharge location. Please add this issue to the adjustment request that is pending. This should be accomplished by contacting Mark Bergam, at 206-296-7270. • The previous drainage plan showed a proposed cutoff drain along the west and south property lines. Please revise the conceptual plan to address the offsite flow along these property lines. • Please note that this short plat is dependent on the Flueve Des Voilve subdivision approval and construction. All comments relative to the plat also apply to the short plat. • Please note that a drainage adjustment has been submitted for review and is pending review and approval. • Please note that a road variance has been submitted for review and is pending review and approval. Density: • Please revise the site plans to provide accurate calcuations for the acreage being transferred to the Cogger Short Plat from the Plat of Flueve Des Voiles with the boundary line adjustment. • Please submit a revised density calculation worksheet to reflect the changes above. • Please note that after initial staff calculations it would appear that the short plat has exceeded the density allowed under R-6 zoning. Please revise the number of lots to meet the appropriate density for the R-6 zone or provide documentation for the use of Transfer Density Credits to meet the code requirements. Revised Preliminary Plat: Provide 15 copies of a revised preliminary short plat, as necessary, as a result of above-referenced requests for additional information. As a result of the review of the information, additional information ( studies, revisions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguration and/or loss of lots. f::nnnP-r ~hnrt Pl::it -I n"~On.d.O • ® King County Department of Developmenl and Envitonmemal Services Land Use Services Division 900 Oakesdale A venue Southwest Renton. Washington 98055~1219 'lat Screening Transmittal r'reliminary Plat Application o ... euve Des Voiles (formerly known as Soos Creek Plat) LUSD File No. L04P0002 Date of Information Request: May 11, 2006 Deadline for Submittal of Information: August 11, 2006 Please provide ten (10) copies of the following, unless otherwise noted. Drainage/Roads: • The conceptual drainage plan shows a conveyance system for the 124'" Ave SE road improvement. Please revise the conceptual plan to address the stormwater detention and water quality requirements of the SWDM. Please include a detail of the proposed water quality design. Q The routing of the 124'" Ave SE out to SE 192nd St constitutes a change in the natural discharge location. Please add this issue to the adjustment request that is pending. This should be accomplished by contacting Mark Bergam, at 206-296-7270. • The previous drainage plan showed a proposed cutoff drain along the west and south property lines. Please revise the conceptual plan to address the offsite flow along these property lines. • Please note that a drainage adjustment has been submitted for review and is pending review and approval. • Please note that a road variance has been submitted for review and is pending review and approval. Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necessary, as a result of above-referenced requests for additional information. As a result of the review of the information, additional information (studies, revisions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguration and/or loss of lots. FIP11vP rlP.~ Vnih:'!$. lfnrmP.rlv ~nos C:rAAk Pl;:itl-L04P0002 King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Ave. Southwest Renton, WA 98055-1219 April 28, 2006 Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 Loma Taylor TEC, Inc. 205 Front Street South/P.O. Box 1787 Issaquah, WA 98027 RE: Fleuves des Voiles Preliminary Plat, L04P0002: 1998 KCSWDM Adjustment No. L06V0040, Notice of Complete Application Dear Applicant/Engineer: The purpose of this notice is to inform you that on April 28, 2006 the Land Use Services Division, Engineering Review Section staff has determined this September 1998 King County Surface Water Design Manual (KCSWDM) adjustment application is COMPLETE under the requirements of King County Code (KCC) Title 20. This determination establishes the beginning of the 120- day time period for your application processing. Our goal is to process your application within 120 days. However, the complexity of your project, level of analysis required, the quality of your submittal and available resources will affect the actual review time. The time line can be impacted by one or more of the following actions that will stop the 120-day clock: • Any request made by the Engineering Review Section staff for additional information. • Changes or revisions requested by the applicant(s). • Mutually agreed upon request to stop the 120-day clock. Should you have any questions, please contact me at (206)-296-7270 and FAX (206)-296-6613. sJl;l Mark J. B~ll::z~ Senior Engineer Engineering Review Section Land Use Services Division ® King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Certification of Applicant Status Renton, Washington 98055-1219 206-296-6600 TTY 206-296-7217 For alternate formats, call 206-296-6600. LO"/POOO:::Z. on c:;( Lc::J 5 S 00 2/C Activity Number: _______ _ Permit Name: F/evve 4~.s Va//es P/&f-r ah-/ Permit Number: CoQ.=,e r She:, rt-Pfq F FOR INDIVIDUALS: I.I ..J I,-------------------(print name), hereby certify that I am the/an owner of the property which is the subject of this permit. If I am not the sole owner of the property, I certify that I am authorized to represent all other owners of the property. My mailing address is: I further certify that I am the "Applicant" for this permit and as such am financially responsible for all fees and will receive any refunds paid. I shall remain the "Applicant" for the duration of this permit unless I transfer my "applicant" status in writing on a form provided by DOES. * Signature of Applicant -OR- FOR CORPORATIONS/BUSINESS ASSOCIATIONS: Date Signed I, Chor/es Spc;, e -1-J-i (print name), hereby certify that I am ' ~~c an authorized agent of Sees ca~k. R~/ £,-k..f« ,. , a corporation or other business association authorized to do business in the State of Washington, which is the sole owner of the property that is the subject of this permit. If this corporation or business association is not the sole owner of the property, I certify that this corporation/business association is authorized to represent all other owners of the property. The mailing address of this corporation/business association is: '=,8"31: Rav'<!.-.naa ,,q-.,-,.e.. /\/E Sea H/,_ C..UA 9?//S I further certify that the above named corporation/business association is the "Applicant" for this permit and as such is financially responsible for all fees and will receive any refunds paid. This corporation/business association shall remain the "Applicant" for the duration of this permit unless it transfers its applicant status in writing on a form provided by ODES. *~-"~a.,~ NOTICE TO APPLICANTS: By law, this department returns all engineering and other plans to the applicant. If, however, you wish to authorize the department to return engineering and other plans directly to the engineer, architect, or other consultant for the limited purpose of making corrections, please designate below: a I authorize this department to return plans directly to my consultant(s) for the limited purpose of making corrections as designated on this form. CONSULTANTS: ~1/I ?e:.v/or V P.o. IBd>< 17 87 .,;2 OS /re#?.,? S~. S . .ZSsofva ~ WA 9g>o2-7) 6-lay/or@ r:ecc/v1/. Con-, rmr~©L~OW@[Qj APR 1 8 2006 K.C. D.D.E.S. L06V0040 ,@i":©ICU 1c' Jteck out the DOES Web site at www.metrokc.gov/dd Certification of Applicant SlatusFORM lc-cer-apstal.pdf 01/08104 APR•ile t;o(t.·~ K.C. D. D. t', S • Following are 3 standard adjustments required for the proposed drainage detention system proposed for the Fleuve des Voiles Plat Application #L04P0002 and Cogger Short Plat Application #L05S0040. I. Standard adjustment to 2005 Manual Core Requirement #1, Discharge at the Natural Location. The project proposes to discharge project runoff to the Soos Creek wetland slightly north (upstream) of the natural location. It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable is preferable because strict compliance with Core Requirement # I would result in discharge to the neighboring backyards creating an unacceptable situation for the adjacent property owners. 2. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. The project proposes to use Level I detention criteria for the entire site. The project site contains both Level 2 and Level I detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level l detention pond at the base of the hill in the level I detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. 3. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stonnwater is a logical extension of this concept. Note on all adjustment requests: The Fleuve des Voiles Plat is vested under the 1998 KCSWDM and the Cogger Plat must comply with the 2005 KCSWDM The existing site runoff calculations used/or sizing the detention system comply with the 2005 Manual requirements for Cogger and the 1998 Manual requirements for Fleuve des Voiles. This means that the Cogger Short Plat area was modeled as folly forested for the existing conditions. The pond itself complies with the requirements of 2005 KCSWDM Ravenna Development LLC / Charles Spaeth 6839 Ravenna Ave. NE, Seattle, WA 98115 206-526-8481 I (fax) 206-526-5939 cshaffercorp@att.net Apil 14, 2006 Dept. of Development and Environmental Services 900 Oakesdale Ave. SW Seattle, WA 98055 Re: Surface Water Design Manual Adjustment Request Fleuve des Voiles Plat Application (L04P0002) Cogger Short Plat Application (L05S0040) Ladies and Gentlemen: Attached please find: Submittal Instructions for Surface Water Design Manual form -one copy. Surface Water Design Manual Adjustment Request -three copies. Current Fee -Paid (see attached receipt) Site Plan/Drainage Plan (Fleuve des Voiles and Cogger 4 pages) -three copies Related Documents - • This Adjustment Request is in conjunction with the Fleuve des Voiles and Cogger Short Plat applications cited above -Chad Tibbits is the coordinator for both applications. No approvals or preliminary permits have yet been granted for either project. • Certificate of Applicant Status -three copies • Response to Preliminary Plat Application ofFleuve des Voiles (L04P0002) January 5, 2006 request for additional information (attached): o A drainage aqjustment is required.from Core Requirement I, to combine the onsite subbasins and changing sheet flow to concentrated flow. Please clarify the conceptual drainage plan, it is unclear if stormwater infiltration is still proposed. Note that infiltration does not appear to be feasible. L06V0040 K.C. D.D.E.S. Done. A drainage adjustment addresses the issue of combining subbasins and changing sheet flow to concentrated flow (see Justification page of Surface Water Adjustment Request.) Infiltration has been removed and replaced with detention. (Here submitted: 3 copies of Preliminary TIR revised March 29, 2006; together with 3 copies of "Surface Water Design Manual Requirements / Standards Adjustment Request" with "Justification" page as prepared by Taylor Engineering Consultants) We are concerned about the suitability of a storm water infiltration pond for this project. Based on a detailed review of the project geotechnical reports, the exploration pit soil logs and information from previous nearby projects, we are concerned about the infiltration rate, the dept to ground water during a very wet period of time and the infiltration of storm water into the toe of a slope that may not be as stable as it appears from the available site information. Thus, we recommend that you seriously consider replacing the proposed infiltration pond with a detention pond. Please contact Larry West or Bruce Whittaker if you have questions regarding this recommendation. Infiltration has been removed and replaced with detention. Response to Preliminary Short Plat Application for Cogger (L05S0040) January 5, 2006 request for additional information (attached): o DRAINAGE I ROADS • Item# I: A drainage adjustment is required to route the post- developedjlows to the north into the proposed Fleuve des Voiles drainage facility. The adjustment should include a shared facility plan approval. The aqjustment should also address the merging of two drainage manual requirements, 1998 manual for Fleuve des Voiles and 2005 Manual for Cogger Short Plat. • Item #2: Submit a conceptual drainage plan and preliminary calculations showing compliance with the appropriate drainage manual. The preliminary calculations should show adequate capacity to include both subdivisions. A Surface Water Adjustment Request (together with "Justification") is herewith submitted. It includes a request for a shared facility plan as suggested by DOES staff. This Request merges the 1998 drainage manual requirements for Fleuve des Voiles and the 2005 requirements for the Cogger Short Plat. (See Item #3 on the Justification page of Surface Water Adjustment Request.) 3 copies of the Preliminary TIR revised March 29, 2006 for "Fleuve des Voiles and Cogger Plats" are here submitted with the Fleuve des Voiles materials, together with 3 copies of "Surlace Water Design Manual Requirements/ Standards Adjustment Request" with "Justification" page (all prepared by Taylor Engineering Consultants) See page C-1 ofFleuve and C-1 of Cogger engineering maps showing drainage system plan. Please contact Charles Spaeth if additional information is required to process this Drainage Adjustment Request. Cc: Chad Tibbits Sincerely, Ravenna Development LLC Applicant ~!t:'72'___ ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton. Washingcon 98055-1219 'lat Screening Transmittal rlreliminary Plat Application o •.. euve Des Voiles (formerly known as Soos Creek Plat) LUSD File No. L04P0002 Date of Information Request: January 5, 2006 Deadline for Submittal of Information: April 5, 2006 Please provide ten (10) copies of the following, unless otherwise noted. Dr~ge: (_:) A drainage adjustment is required from Core Requirement 1, to combine the onsite subbasins and changing sheet flow to concentrated flow. (see drainage bullet 6 our March 17, 2004 screening letter). Please clarify the conceptual drainage plan, it is unclear if stormwater infiltration is still proposed. Note that infiltration does not appear to feasible. t;) We are concerned about the suitability of a storm water infiltration pond for this project. Based on a detailed review of the project geotechnical reports, the exploration pit soil logs and information from previous nearby projects, we are concerned about the infiltration rate. the depth to ground water during a very wet period of time and the infiltration of storm water into the toe of a slope that may not be as stable as it appears from the available site information. Thus. we recommend that you seriously consider replacing the proposed infiltration pond with a detention pond. Please contact Larry West at 206 296-7131 or Bruce Whittaker at 206 296-7211 if you have any questions regarding this recommendation. Traffic/Roads: • Please confirm that the horizontal curves on the plat street comply with the criteria in Section 2.1 OE of the King County Road Standards, or submit and receive approval for a Variance to approve any non- standard design elements. It appears that the horizontal curves near Lots 23, 24 and 25 (for example) would require the use of the 100-foot centerline radius since the central angle of the curves is less than 75 degrees. • Please confirm that 122nd Court SE and 123"' Place are proposed to be private access tracts. The proposed turnarounds do not meet the KCRS requirements for radius, and, since they are proposed, the deviation from the standard radius (40-feet) will need to be approved through the Variance process. • Please show the required sight-line (stopping sight distance) for an eastbound vehicle on SE 191•1 Street on the approach to the 123"' Place SE intersection. It appears that this may require some limited additional dedication across the southern portion of proposed Lot 5. • The proposed 12-foot off-set in centerlines between the proposed north and (existing) south leg of the 124th Avenue SE/SE 192nd Street intersection will require approval through the Road Variance process. Please submit an application for a Variance to Section 2.10 of the KCRS for this item (as well as any other non-standard design elements). Approval of the Variance, or a redesign to fully comply with the Road Standards, must occur prior to the hearing for this project. Critical Areas: • Three outfalls are shown within the wetland buffer (Tract A). The outfall locations can be permitted provided they are located as far from the wetland as possible. The outfalls would be considered allowed buffer impacts and would require mitigation. • To minimize buffer impacts for road construction structural retaining walls will be required for new road construction. Grading for road construction is not permitted within sensitive area tracts. l=IP1 '".,. n1=1c:. \/n.ilP~ tfnrmArlv ~nn~ r.rAAk P~n -I 04P0002 ® King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton. Washington 98055-1219 >lat Screening Transmittal I Preliminary Short Plat Applica on for Cogger LUSD File No. L05S0040 Date of Information Request: January 5, 2006 Deadline for Submittal of Information: April 5, 2006 Please provide ten (10) copies of the following, unless otherwise noted. Dr~ge/Roads: CJ_) A drainage adjustment is required to route the post-developed flows to the north into the proposed Fleuve Des Voiles drainage facility. The adjustment should include a shared facility plan approval. The adjustment should also address the merging of two drainage manual requirements, 1998 manual for Flueve Des Voiles and 2005 Manual for the Cogger Short Plat. Ck) Submit a conceptual drainage plan and preliminary calculations showing compliance with the appropriate drainage manual. The preliminary calculations should show adequate capacity to include both subdivisions. 3. The proposed property lengths abutting the proposed on-site turn-around for the proposed lots 5 and TR-C/TR-J are inadequate for a driveway. Per the 1993 King County Road Standards (KCRS), the minimum driveway length is 10-feet and shall locate the edge of the driveway at a minimum 5-feet from the side property lines. 4. The proposed on-site turn-around should be revised to be consistent with the 1993 KCRS design requirements. 5. Narratives in the submitted drainage report shall clearly indicate that the proposed short plat is subject to full compliance with the 2005 KCSWDM guidelines or approved adjustment. 6. Revise the internal road design to meet the urban minor access road standard including sidewalk on one side. The sidewalk should be included in the proposed R/W. 7. The drainage report shall be revised accordingly, and three sets of revised plans and reports shall be included with the next engineering submittal. Note that infiltration does not appear feasible for these subdivisions. 8. Please note that this short plat is dependent on ihe Flueve Des Voilve subdivision approval and construction. All comments relative to the plat also apply to the short plat. Critical Areas: Submit three (5) copies of a Geotechnical report for this Short Plat. For further questions please contact Larry West (Earth Scientist) at (206) 296-7131. Recreation Space: Submit a conceptual recreation plan that indicates the type of improvements (i.e. sport court, play structure, benches, landscaping, etc.) proposed within the recreation tract(s). See KCC 21A.14.180(E)(2) for equipment requirements. Walkways: Provide an inventory map (i.e. existing conditions -widths, surface type, etc.) of the walking routes to the elementary, middle school/junior high, and high schools and/or the appropriate bus stop location associated with each school. Identify any improvements necessary to provide safe walking conditions. Field Survey: Provide a copy of the base topographic map stamped by a Licensed Surveyor in the State of Washington. r,..,n,,,.,.,-C:hnrt Pl.:1t _ I ni:;,c;:nn..t.n • Taylor Engineering Consultants PRELIMINARY TECHNICAL INFORMATION REPORT for Fleuve des Voiles and Cogger Plats King County Tax Parcel Nos. 619900-0220, -0240, 0241, & -0260 Subdivision File # A03P0286 LSUD File# L04P0002 Site Address: 12216 SE 192°d Street Renton, Washington L06V0040 -~, ~ n " --,--. iS ,',-.,_j C : '.11/ i .. :·: :..'.::J '1,~ . c.. ! __ \_'i_:' ; _ 1. APR 1 Ii . K.C iJ :J f TEC Project No. 294-JMA Prepared by: Lorna M. Taylor, P.E. Date: September 15, 2004 Revised: March 29, 2006 205 Front St. S • P.O. Box 1787 • Issaquah, WA 98027-0073 • tel. (425) 391-1415 • fax (425) 391-1551 • www.teccivil.com Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Section 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Appendices Appendix A: Appendix B: Appendix B-1: AppendixC: Appendix D: Appendix E: TABLE OF CONTENTS Description Project Overview ........................................ . Conditions and Requirements Summary .......... . Off-Site Analysis ......................................... . Flow Control and Water Quality Facility Analysis and Design ................................................... . Conveyance System Analysis and Design ....... . Special Reports and Studies ......................... . Other Permits ............................................. . ESC Analysis and Design ............................. . Bond Quantities, Facility Summaries, and Declaration of Covenant.. ............................. . Operations and Maintenance Manual. ............. . Figures Page Number 1 1 3 4 5 5 6 6 6 6 1. Technical Information Report (TIR) Worksheet 2. Site Location 3. Drainage Basins, Subbasins, & Site Characteristics 4. SGS Soils Map Off-site Analysis Drainage System Table and Map Drainage Complaint Analysis (previously submitted) Analysis and Design Maintenance Requirements for Privately Maintained Drainage Facilities -not included in this preliminary report Bond Quantities Worksheet -not included in this preliminary report Retention/Detention Facility Summary Sheet and Sketch Declaration of Covenant -not included in this preliminary report TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat SECTION 1 PROJECT OVERVIEW This Technical Information Report is submitted to the King County DOES in accordance with the King County Surface Water Design Manual (KCSWDM). A Level 1 Technical Design and Information Report for Preliminary Plat Review, dated January 26, 2004, was previously submitted for the Fleuve des Voiles site; and portions of that previous report are referenced herein; however, the proposed plat has been significantly changed and this TIR addresses the currently proposed plat layout. The Fleuve des Voiles plat was submitted as the "Soos Creek Plat" on September 15, 2004 and is subject to full compliance with the 1998 KDSWDM. That plat layout has been modified and the drainage facilities re-sized to accommodate the revised layout and the additional adjacent Cogger Short Plat which is subject to full compliance with the 2005 KDSWDM. This TIR addresses the development of both plat areas and the requirements of each version of the manual or approved adjustments. A Surface Water Design Manual Requirements/Standards Adjustment Request has been prepared addressing three standard adjustments to Core Requirement #1 and #3. The 6.74-acre Fleuve des Voiles project site and 0.93-acre Cogger project site comprise 4 existing lots and are located at 12216 SE 192"d Street in Renton, Washington. The Fleuve des Voiles project proposes to subdivide three lots into 39 residential lots, and the Cogger project proposes to subdivide the fourth lot into 8 lots, providing the required infrastructure, including access roads, water and sanitary sewer service, storm runoff collection, conveyance, detention and treatment, and erosion control for each plat during construction. Appendix A contains a Technical Information Report (TIR) worksheet for the projects (Figure 1), as well as a Site Location Map (Figure 2), Drainage Basins, Subbasins, and Site Characteristics figures (Figure 3a -3e), and a Soils map (Figure 4). More detailed site information is included in Appendix C with the existing and developed site runoff model data. SECTION 2 CONDITIONS AND REQUIREMENTS SUMMARY The following summary describes how this new project will meet the eight "Core Requirements" and the 'Special Requirements" that apply: Core Requirements 1. Discharge at the Natural Location: The sites currently slope, steeply in places, to the east and the Soos Creek wetlands. The southernmost portions of the Cogger Plat property drain east along the north edge of SE 192"d Street in an ill-defined swale. There are no well-defined drainage paths on the site, and runoff occurs in a dispersed manner. The project proposes to detain all runoff from the developed portions of the property and to bypass and disperse off-site flows, which should adequately mimic existing conditions. However, this will require a Standard adjustment to Core Requirement #1: It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable is preferable because strict compliance with Core Requirement #1 would result in discharge to the neighboring backyards creating an unacceptable situation for the adjacent property owners. TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat 2. Off-Site Analysis: A Level 1 offsite analysis was conducted for these preliminary plats as described in Section 3. 3. Flow Control: Runoff from the sites will be controlled to meet the requirements of the KCSWDM in a combination detention and treatment pond. Discharges from the facility will be to a dispersion/energy dissipation facility. Two standard adjustments to Core Requirement #3 are required for this proposal: 1) The project proposes to use Level 1 detention criteria for the entire site. The project site contains both Level 2 and Level 1 detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In lieu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level 1 detention area. This will meet and exceed the intent of the code by removing all runoff from the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. Appendix C contains the KCRTS input and output. 2) These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stormwater is a logical extension of this concept. 4. Conveyance System: The conveyance system will be sized to convey the 25-year storm without flooding and the performance during the predicted 100-year storm will be evaluated to ensure that significant flooding will not occur. (not included in this preliminary report) 5. Erosion and Sedimentation Control: Runoff from the grading and trenching construction areas will be contained by a temporary construction entrance, silt fencing and sediment traps/ponds in accordance with the KCSWDM during construction. The ESC facilities will only be removed once all exposed site surfaces have been stabilized. Other temporary erosion and sedimentation control measures will be installed as needed. (not included in this preliminary report) 6. Maintenance and Operations: The combination detention and treatment pond and cartridge filter treatment catch basins should be maintained as described in Appendix D, which includes the KCSWM Maintenance Requirements for Privately Maintained Drainage Facilities. (not included in this preliminary report) 7. Financial Guarantees and Liability: The bond quantities worksheet is included in Appendix E. (not included in this preliminary report) 8. Water Quality: Treatment of runoff from the 124th Avenue SE roadway will be provided in two cartridge filter treatment catch basins and the runoff from the remainder of the site will treated in the dead storage portions of the combination detention and treatment ponds, both of which were sized according to the KCSWDM for Basic Water Quality Treatment. Appendix C contains the calculations used to size the treatment facilities. Special Requirements 1. Other Adopted Area-Specific Requirements: Shared Facility Drainage Plans (SFDPs): These two projects propose to provide detention and treatment in a common facility located in the Fleuve des Voiles plat. The facility sizing took into account the differences in drainage manual requirements for the 2 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat two projects. The only impact this had on the design is that the Cogger Short Plat area was modeled as fully forested for it's existing condition. The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The detention facility is located at the base of the hill and will discharge via dispersion to a Level 1 Flow Control area. Appendix A contains King County mapping to support this. 2. F/oodplain!Floodway Delineation: Not Applicable. 3. Flood Protection Facilities: Not Applicable. 4. Source Controls: Not Applicable. 5. Oil Control: Not Applicable. SECTION 3 OFF-SITE ANALYSIS The downstream drainage path was documented and the County's Drainage Complaints File was again solicited to make sure no additional pertinent drainage complaints have been lodged since the original Drainage Complaint Analysis, dated March 20, 2004, which was produced for the project by Jacques Consulting. Task 1. Study Area Definition and Maps The figures in Appendix B show the extent of the study area and the local topography. The Site Plan drawing shows more detailed topographic information on the project site. Task 2. Resource Review Agency mapping was reviewed and TEC contacted King County regarding documented drainage complaints in the vicinity. The SCS soils map identifies site soils in the proposed development area as Alderwood Gravelly Sandy Loam, 0 -6% slopes and 15 -30% slopes. Task 3. Field Inspection In accordance with the KCSWDM, the existing site and off-site drainage systems were inspected on June 15, 2004. Task 4. Drainage System Descriptions and Problem Descriptions There is only one report of a drainage problem in the immediate vicinity of the project. This complaint involved a plugged driveway culvert across 124th Avenue SE at SE 192"", and the problem has been corrected according to the previously submitted Drainage Complaint Analysis by Jacques Consulting, dated March 20, 2004 (see Appendix B-1). The County's drainage complaints file was solicited again more recently, and the results of this search are included in Appendix B. No additional pertinent drainage complaints have been logged in the interim. If the proposed drainage system were to fail, and the detention facility were to flood, the emergency overflow path for runoff would be into the adjacent Soos Creek wetlands. These wetlands feed Soos Creek, which flows south on the King County-owned property to the east of the project property. 3 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Task 5. Mitigation of Existing or Potential Problems To mitigate any water quantity impacts from the project, detention of runoff is proposed meeting Level 1 flow control requirements in accordance with the King County Surface Water Design Manual (KCSWDM) and a Standards Adjustment Request. Water quality impacts will be addressed in two Basic Water Quality treatment facilities; a combination detention and treatment pond and two cartridge filter treatment catch basins. The pond will treat runoff from the site, and the cartridge filters will treat runoff from 124th Avenue SE. SECTION4 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The following subsections describe the measurements and criteria used to size the detention and treatment facilities. Existing Site Hydrology (Part A) The drainage on the existing site was analyzed for this project with KCRTS. Figures provided in the KCSWDM and KCRTS manual were used to determine project location and scale factor parameters. The figures in Appendix C show the delineation of the areas generating runoff on the site. The site soils are classified Alderwood Gravelly Sandy Loam, either O -6% or 15 - 30% slopes. Appendix C also contains the data and output from the existing site hydrologic analysis. The existing site conditions identified for this project and used in the KCRTS modeling included 6.97 acres of forest, 0.31 acres of impervious surfaces, and 0.39 acres of grass/landscaping. Developed Site Hydrology (Part B) The proposed drainage systems will route "site" runoff to a Level 1 detention pond which will route outflow to a dispersion/energy dissipation facility draining to the adjacent Soos Creek wetlands. Runoff from 124th Avenue SE will be controlled as over-detention in the pond and will flow directly to treatment catch basins prior to dispersed discharge to Soos Creek north of SE 192"d Street. · The developed site conditions identified for this project and used in the KCRTS modeling included 5.06 acres of impervious surfaces, 2.27 acres of grass/landscaping, and an additional 0.34 acres of impervious surface on 124th Avenue SE that will bypass the detention. Appendix C contains the data and output from the developed site hydrologic analysis. Performance Standards (Part C) The site contains both Level 1 and Level 2 Flow Control areas per the KCSWDM, however the areas designated Level 2 are those located within the steep slope designations. Since the project proposes to bypass offsite flow and pipe onsite runoff to the base of the hill and the Level 1 area, Level 1 Flow Control is proposed. The detention facility is located at the base of the hill and will discharge (via dispersion) to a Level 1 Flow Control area. Conveyance features will need to be sized to convey the 25-year developed runoff and their performance during the 100-year event should be checked to be sure that significant flooding would not occur as a result. Flow Control System (Part D) The detention pond was sized using the KCRTS routine. The following table summarizes the sizing requirements for the detention pond. 4 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat Detention Pond Reauirements Required storage volume Effective storage depth Top area@ 1' freeboard Bottom area Orifice #1 diameter Orifice #2 diameter Orifice #2 heiaht Pond 57,698 cf 4 ft 19,549 sf 11,288 sf 2.19" (2-3/16") 2.34" (2-5/16") 3.00 ft Descriptions of the procedures used and calculations and computer output are included in Appendix C. Water Quality (Part E) Runoff from the site will be treated in the dead storage portion of the combination detention and treatment facility, which was sized for Basic Water Quality Control. Runoff from 124111 Avenue SE will be treated in two cartridge filter treatment catch basins. The following table summarizes the sizing requirements for the treatment pond. Treatment F acilitv Site Pond 124th Ave. SE Filters Required wetpool volume (Vb) 26,217 cf Wetpool depth 4 ft Top area 15,995 sf Q .. -0.05 cfs Descriptions of the procedures used and calculations and computer output are included in AppendixC. SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 6 SPECIAL REPORTS AND STUDIES Several studies and reports were conducted and produced for this project and are available under separate cover as listed below. 1. Wetland Evaluation and Delineation Report prepared by H & S Consulting, dated May 13, 2004. 2. Traffic Impact Analysis prepared by William Popp Associates, "Draft" dated May 27, 2004. 3. Geotech Report prepared by GeoTrends, Inc., dated March 20, 2004. 4. Conceptual Buffer Mitigation Plan prepared by AC Roth Environmental Services, dated March 20, 2006. 5 TEC Preliminary Technical Information Report Fleuve des Voiles Plat & Cogger Short Plat SECTION 7 OTHER PERMITS No other permits beyond those required by King County are anticipated to be required for this project. SECTION 8 ESC ANALYSIS AND DESIGN Not included in this preliminary report. SECTION 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantities: Not included in this preliminary report. Facility Summaries: The County's Facilities Summary Sheet is included in Appendix E. Declaration of Covenant: Not included in this preliminary report. SECTION 10 OPERATIONS AND MAINTENANCE MANUAL Not included in this preliminary report. 6 TEC APPENDIX A FIGURES 1. Technical Information Report (TIR) Worksheet 2. Site Location Map 3. Drainage Basins, Subbasins, & Site Characteristics 4. SCS Soils Map King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJE0TOWNER AND PR041ECTENSl!SIEER Phone ?1)6 -cu ~we1 Project Engi,:ieer 1-QrtJa- Company _ __,_,=i.--+-...1..L.'-'=--'-------,-;,;---: Address/Phone Subdivison fl ec<.'1t. ,J..,..; \lo;/,.. s Short Subdivision Co'f'Je, Grading Commercial 0 Other ________ _ Community Drainage Basin D River D Stream D Critical Stream Reach D Depressions/Swales D Lake R' Steep Slopes -~'(-0_._07_., ____ _ Part. 2 PROJECT ,oGATION.A.ND DESCRIPTION · Location 7 Township _z-· -3~N~-- Range _ _..,5)"'"{;i~--- Section ___,,,?:3_.,.,..,_ ___ _ 0 DFW HPA D Shoreline Management D COE 404 D Rockery D DOE Dam Safety D Structural Vaults D FEMA Floodplain D other D COE Wetlands D D D D D D Floodplain Wetlands Seeps/Springs High Groundwater Table Groundwater Recharge Other Figure 1 TIR Worksheet (3 pages) . ,, Part 7 SOILS Erosion Potential Erosive Velcoties ~ Additional Sheets Attached .re.e.. (}e,;k c~ /?e(1erf urv/.r.r Je;;~ Cov-12,- Part 8. DEVELE)f'fl/iEN[l\~IMl;l[i"j;\~~~ ' ' , .. "'· ;•_,,'" ·,,',' ., •. · .. , REFERENCE ~ Ch. 4 -Downstream Analysis D D D D [J D Additional Sheets Attached MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION ~ Sedimentation Facilities 0' Stabilized Construction Entrance ff Perimeter Runoff Control (J Clearing and Graing Restrictions fl Cover Practices 16 Construction Sequence D Other LIMITATION/SITE CONSTRAINT MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION S-Stabilize Exposed Surface ~ Remove and Restore Temporary ESC Facilities c:(' Clean and Remove All Silt and Debris 8"' Ensure Operation of Permanent Facilities g/Flag Limits of SAO and open space preservation areas D Other Part 10 SURFACE WATER SYSTEM D Grass Lined D Tank D Infiltration Method of Analysis Channel fl Vault lJ K.c12r'i (e ~11 0' Pipe System Depression iJ Energy Dissapator D Flow Dispersal Compensation/Mitigati on of Eliminated Site D Open Channel D Wetland D Waiver Storage rJ Dry Pond D Stream D Regional lY"wet Pond Detention Brief Description of System Operation '.--(i)L..,!SC!l;J.c..._,'-""'""'-J.J.._-i"l""-"'-..Ll<CL...J'-"-"UL.--""'a<...Lf---1-.LJ.---!'="4,.. IC~ Facility Related Site Limitations Reference Facility . . ·' ' Part 11 STRUCTURAL ANALYSIS D Cast in Place Vault WRetaining Wall D Rockery > 4' High IJ,, Structural on Steep Slope D Other ,,. ·,'.-.:-'. ·.:·. -"._. ·: Part 12 .. EASEMEJIITS/TRACTS .-: ., -, ,' . : . D Drainage Easement D Access Easement , .<::_ :_;-· ,,. ' ~ Native Growth Protection Easement D Tract D Other Part 13 SIGNATURE OF PROFESSIONAL tNGiN(~,; I or a civil engineer under my supervision my supervision have visited the site. Actual site conditions as observed were incorporated into this worksheet and the attachments. To the best of my knowledge the information provided here is accurate. . MapQuest: Maps: print E;J Send To Printer Back to Map I 12216 Se 192nd St ' Renton WA ' 98058-7526 us I Notes: I All rights reserved. Use Subject to Ucense{CopyrighL I Map Legend This map is informational only. No representation is made or warranty given as ti MapQuest and Its suppliers assume no responslbillty for any loss or< Privacy Policy & Legal Notices © 2004 MapQuest.com, Page 1 of l Figure 2 Site Location Map No Scale http://www.mapquest.com/maps/print.adp ?mapdata=p5kqyoo6yZLyznAhGFxE2MBWwU... 9/10/2004 Map Output ®King County li!S SQl<!Clad Pomok 1 _ • County Bounda,y Stn!oto mil -r, /if - f"/ ~ Home News C14ifi4M Le{lend !IT]] la.lea~ and Lll:!Qe .RivQig ,/../ Stma~ !15· King C.,,,nty own,i"'J>&ltiO<> D Po..- /v TQll<I Co'1M~,. {5ft) Page 1 of 1 Comments Mi¥ii4,M e information included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or ·mp lied, as to accuracy, completeness, timeliness, or rights to the use of such information. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or Jost profits resulting from the use or misuse of the information contained on this map. sale of this ma or information on this ma is rohibited exce t b written ermission of Kin Coun . King County I GJS Center I News I Seivices I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. The details. Figure 3a Drainage Basins, Subbasins, & Site Characteristics Scale as shown http://wwwS.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&Clie ... 9/10/2004 Map Output @) King County . -l • D'mnty &ruMaty s1r£:1ets .,._{<tl H-~~b"J' "/.,/ Mu-:W,, ~'*' Pareel< Ft~1 ~hd tlkJ-1 -SAOSt~a:!'($ i~-1 (:~~ ';,! ?»cttl.'I># lllmmll Ci4GG¥1 .r·,-·' Legend l..ak>ra :at't4 l~fge Riv'af$ ·stlri't:oln~ ~ fbt'Kh,,ay ES] 1:00 Y~a:rflrodp~ \!Vi.RO Ch~r1n.ffl t~rat~·1 Ha:zas'd Am~.S 00".irn:$ SAO~l!amf S/10 lMdllJid• SAO Sek;~ .SAOEro~n L:atld:sfiOB Hazard O!amage Ama comments :it',~:<1.1>:p. l-1,W.::d Page 1 of 2 Wi4Wt4iM e information included on this map has been compiled by King County stall from a variety of sources and is subject to change without notice. King County makes no representf ·mplied, as to accuracy, completeness, timeliness, or rights to the use ot be liable for any general, special, indirect, incidental, or conseque o, lost revenues or lost profits resulting from the use or misuse of the sale of this ma or information on this ma is rohibited exce t b· .King County I GIS Center I News I Services I Co Figure 3b Drainage Basins, Subbasins, & Site Characteristics Scale as shown http://www5.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceNamc=overvicw&ClientV ... 9/15/2004 I -"· ;. __ _ i ,-' ' I I : I ~---) ·~---1 . __ _J f I I ..... _L_/ Figure 3c Drainage Basins, Subbasins, & Site Characteristics Scale as shown + C iil -· li'O :::l :ll en "' -,IQ en ... (D "Tl n ID CD -· 2!. (') "' (.Q '° :::r u, C ~ Q) -· ~ (/1 ... :::l ff) "' (/1 u, n • w ;;,..enc. 0 (D s:: ::: :l. C' :::l ~ C' -· "' ("j (/1 (/1 -· --~ -;---. :::l (/1 w A03P028f SENS Topo Cof ' ~~00 NF1,ti and Ollttl Oria Bald Ea<;ila Ne~~ ffrcmr.H.;, Line.I ". W!ldflfeN~rll o•-"§:1'.a \,,"QSUNES ~SECUNES "'N1"H?t.1r;ES N'""" ti,'"-" §~; t'v' ;,, tJ ~ SAO VV~Jtnd C2l SAO l..nd$11de E:5 SAO Co.i Mint CS]SAO~ Cl SAO """'°" W~Elcidoe!i 0 WlRO Drainage ~mpj,ltr'l13 .-~-·. Parcels 1 Pa~0~1 .... ,H .... INOFW2 OR T'REESl WOFWJ OR IBEES3 ,,. .. ., FEMA Cro91 Sections FEW.. FJoc:,6-y FEMA 100.)"'. Floodplain c,,M NCtty Bounoa!"lh 0 ,oo _1'"= 200 reer 200 Fee1 ® Klno t<><;,my n-. "*""-.....,~on,,.,. INJI .._ o.m -'Vi«> I>)' 1Qr-.;J~..,.lf'Oll\1-yri/~--..... 1o ~~ ~ 16-v eo,.-cy ,.._ 'Cl .. ~ ....... --.. -... ~-"""'--,.Y.~!lrnol--•ni,.ll!iiht.-gf =-~~~:-~-.,.,,,.._.....,i..itw:it~ .. --...... =::.~,.~~":::~.,,~....._ ..,.,......,.~ .... ""-~"'~' - r L[ C iil QO :i' en m en -· <O C') (D (I) "T1 ~ (") III -· (I) :I' Al (C lll Al !!!. C (I) .., :::, .., en m en Cl> :::r C') -o S" en (,) :i: :J. C: Cl) :, en C" ~ C- C") Ill en !!?. :, y, ,,,, A03P0287 i HYDRO & GEOi Bald Eclllfille t,,e11l!. NT;iwnshp Ufle'!, W<ldlft /11-!twO.-.. 0""'"" 11'1'-R • '0Sl1NE6 ~SECL!NES -,,;;;/TVVPUNC.S f\/S1<ee11. 11;ttMm ~rs ,'" V fX:: SAO Welleoo [21 SAO l.andslkla E@ i;.,t,O Coal Mine tsJ SAO SeLsmc 0 SAO Ero$-100 w--m WLRO e>rasnaoe ~ ' Pa/COIi i ••~J:o~,.,.,..,.,.. WOfW2 OR TREl::S1 WDFW2 OR TREESJ TR£ES, l"EMA Cross S1!ciicn11 FEMA Flooctn"ay Fl!:MA 100-)'T Fioodp1&,r c ... Ncity SOW>(J.v,ei 0 ,00 ,OQO 1·~ 1J3J leM 1~oc Fee1 @t<1"11 eovnty II i r,,.1mrmotl0<\ l.""Cl.odm an !1-q, <T.op ~-c,o,o,, ~ ~ i ~ ea.,wy old rr.n, • .........,. gl .,.,,._ rd .. ~ ,o ' ~~~ Klr,aeamr,..-..... I ~-«_,..,...,,...._..«~•n:,rr,,, I IEC.IIICY,~llrNl.-....-'lgrBl,;,a-.,,,_,,i I ....,,.,,,,...,... ...... Klnl,!Coo.N')'llll"oa-~-i....any ~~.lrdnd,I~-----I =-~~'":..":..~~-=~ ' _ ....... ._ lvrf-o/lNa-~ =·-· .. pr,:,hlM90 ~ ..,._ '*""'"-"")o(lr,gi P1coJ€CT .S,1TE. So,L ; "196' I /Jjj) Aj ~ /fL£)0duoolJ <JiAv&tLY ~ lv1A1 ----- fl= 0-1, 'Z Sui.PE;J D = 1r-so% .fLDPES Figure 4 SCS Soils Map 1" = 2,000' APPENDIX B OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE AND MAP Basin: Soos Creek surface flow B-C Wetland/ stream/ channel flow, a22rox. 150' wide C-D 48" culvert D-E Stream 984\in804 OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 Subbasin Name: Subbasin Number: m·••lllllll:11 1 1 ra,1,l1!~~······1 ••••·······, Soos Creek grassy wetland area 3% Soos Creek grassy 1% -I 350' -550' wetland area 2% I Crossing 192nd I I 550' -650' Soos Creek 0.5% -1650' - 1 % 2,650' + I None noted I None noted None noted l!!IIIRIJ;ll~t~l~li••••, Wet marshy area, relatively inaccessible Wet marshy area, relatively inaccessible This culvert was not visible at the time of the inspection, but according to the previous downstream analysis, has conveyed 100- year flows without floodin,, .. Creek flows in a wide wetland area. Map Output (!)King County Off-site Analysis Drainage System Map (Downstream Drainage Path) Scale as shown News Ci#dii&A Pagel of l Comments • • 1,3'4 -= c.. 11 In 11<! 500' http://www5. rn etrokc. g, ·. ,.. / serv lei/com. esri.esrimap.Esrimap ?ServiceN ame=overview&Clie... 9/14/2004 Map Output Pagel of l ®King County -=-amma Services Comm,rnts Search ! ' Information Plannin e infoimation included on this map has been compiled by King County staff from a variety of sources and subject to change without notice. King County makes no representations or warranties, express or mplied, as to accuracy, completeness, timeliness, or rights to the use of such infoimation. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages ir,duding, but not limited o, lost revenues or lost profits resulting from the use or misuse of the infoimation contciined on this map. sale of this ma or information on this ma is rohibiled axce t b written ermission of ;<in Coun . ·-,··------Kinq County I GIS Center I~ I Services I Comments I ~!t1 By visiting this and other King County web pages, you expressly agree to be bound by tcums and conditions of Iha site. The details. M I 1,33 = 10'/ http://www5.metrokc.gov/servlet/com.esri.esrimap.Esrimap?ServiceName=overview&Clie ... 9/14/2004 Map Output ~ Sf.l~C-~t.l P~.a:P.:-* l _• O:',rn:dy :6(n.1fld.aty D K~g Q)uflty o:-ai1age 8¥t!Ml.~ :SU't);d§; Ci4WRW iMAP -Stormwater ?1:~'l'.tf -~~ Legend Page I of I comments ' ·/ e inforniation included on this map has been compiled by King County staff from a variety of sources and is subject to change without notice. King County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such inforniation. King County shall ot be liable for any general, special, indirect, incidental, or consequential damages including, but not limited o, lost revenues or lost profits resulting from the use or misuse of the inforniation contained on this map. sale of this ma or inforniation on this ma is rohibited exce t b written erniission of Kin Coun . King County I GIS Center I News I Services I Comments I Search By visiting this and other King County web pages, you expressly agree to be bound by ternis and conditions of the site. The details. Off-site Analysis Drainage System Map (Drainage Basin Trib. Area) Scale as shown .. , I. 33 e 5,1.31 " I I ~ 'f,t30 http:/ /www5.metrokc.gov/ servle1/com.esri.esrimap.Esrimap?ServiceName=overview&ClientV .. . 9/15/2004 SEP.14.2004 2=04PM KC WLRD PhoM• Kill aty WBtBt 11111 lalld R&IIOll'CU IViliml -1ra1U1ue Sl'Vbll I FoH'4-Z5--/5SI uf Cllll•t Saaroh Print,,d : 9'~41200,, 1:3T:24 Pr.I CQliti TYPII TJl]I of,,.. -. or 1'1'111~ ClmntB 1'l'U8 1'8111 llllllllr -1976,0110 C DRNG 13036 SE 188TH PL @BLVDLN 686G2 1977.()072 C FLDG 12202 SE 192NDST 686F2 1977-0074 C FLOG 13210 SE 192ND ST ~ILL/DRAIN WAY 68eG2 1978.0080 C PONDING 19248 121ST PL SE 1:AST OF 9ENS0N HWY 686F2 1978.0081 C DRNG 19246 121STPL SE 688F2 1981-0225 C FLOG 13210 SE 192NOST DRAIN WAY FILLED 686G2 1982.0539 C FLOG 12600 SE 192N0ST EAST KENT AREA e86F2 19114-0313 R FLOG 13250 SE 192ND ST TO ROADS DN.4 686F2 19S4-0314 C FLOG 13200 SE 192NO ST SE 192ND ST/134TH AVE SE 686F2 1985.()~34 X DRNG 13250 SE 192NO ST LTR TO COMPLAINT 686G2 1966-0617 C ORNG 13432 SE 187TH ST FLOG ON SIDEWALK 686G2 1986.()816 C FLOG 13440 SE 192NO ST REF:86-0832 NESPER 87-0770 686G2 1986-0816 ER FLOG 13340 SE 192NO ST {REF:86-0632 N!;SPER) p;r PROB. 686G2 1986·1278 CL CLAIM #10373 688G2 1987.0770. C FLOG 134<!0 SE 192NOST FAIRWOOD SEE 86-0816 68602 1987,1049 C TO RD COORD 04/27187. 688F2 1988-0118 X DRNG 1325C SE 192ND ST SEE 85-1278 NESPER/CL • FORSESTTRAI 68eG2 1888-0238 C FLOG 18431 120THAVE SE NEW DRIVEWAY WILL IT FLOOD 686F2 1986-0238 ER PIPE 18431 120THAVE SE NEED EXTENSION OF 42" CULVERT ea61'2 1968,0306 C BLOCKAGE 12716 SE 188TH PL EASEMENt-FAIRWOOO/WALL CONSTRUC 68BG2 1989-0003 C DRNG 18812 120THAVE SE INCREASED RUNOFF/CHANNEL 686F2 1989-0192 C ORNO 18612 120THAVE SE X PIPE NOT WORKING 68GF2 1989.()550 C EROSION 19118 130THAVE SE OLD EASEMENT CHANNEL MAINTENANCE 686G2 1989-0665 C PRNG 133Dl! SE 184TH PL WATER IN BASEMENT/YARD DRAIN CLOG 686G2 1990..0056 C FLOG 12700 SE 187TH Pl UT!Llrf EASEMT CLOGGED 90.0259 68602 1990·0259 C FLOG 12700 SE 187TH PL PVT DITCH OVERFLOW 686G2 1aao.11oe C ORNG 13517 SE 189TH PL CULVERT BLEW TRASH RACK/ CEDAR ES 686G2 1990..1106 NDA DRNG 13517 SE 169TH PL CULVERT BLEW T~H RACK/ CEDAR ES 688G2 1990-1165 C ORNG 13421 SE 189THPLACE 13517 SE 189TH PL 68602 1990-115!1 NOA DRNG 13421 SE 189THPLACE REF 90-1106 68002 199~·1156 C DRNG 13429 SE 189TH PLACE 13517 SE 189TH Pl 688G2 1000-1166 NDA DRNG 13429 SE 189TH PLACE REFS0-1106 68602 1990-1157 C DRNG 13435 SE 189TH PLACE 13517 SE 189TH PL 686G2 1990-1157 NOA DRNG 13435 SE 189TH PLACE REF 9().1106 S86G2 199().1158 C DRNG 18917 SE 180TH PLACE 13517 SE 189TH PL 68BG2 1990..< 158 NOA ORNG 18917 SE 1B9THPLACE REF 90-1106 686G2 1990-1159 C DRNG 1352Z SE 1S9TH PLACE 13517 SE 189TH PL 6SGG2 Pago 1 of J £mllpldll fYPI lQB III l'ntlla Mlrm of Pl'd8II Tll'OIPaDI lllllllllr r.a 1990-1159 NOA DRNG 13523 SE 189TH Pl.ACE: REF 90·1106 686G2 1990-1160 C DRNG 13529 SE 189TH PLACE 13517 SE 189TH PL 686G2 1990-1180 NDA DRNG 13629 SE 189TH PLACE REF 00-1106 686G2 1990-1630 C FLOG 19114 130TH AVE SE STREAM OVERFLOW S86G2 1991-1090 C DRAINAGE 18532 131STAVE Sc WATER PONDS IN YARD 685G2 1991-1090 NOA DRAINAGE 18532 131STAVE se YARD PONDS 68SG2 1991-1090 SR DRAINAGE 18532 131STAVE SE TOCIP 686G2 1993-0641 wee SEDIMENT 13120 SE 192NDST 686G2 1994-0676 woe GREENH20 Se 192ND & 134TH A SE DUCKWEED 686G2 1895-0'. 70 woe OIL/CARS 19312 133RDAVl: SE RESIDENTIAL CAR MAINTENANCE aaeG2 1995-0374 C FILLING SE 192ND & 134TH SE WETLAND-RE:=D TO DOES ISMG2 1998-0391 FCR PONO? 19118 130TH PL SE ~OLD-GPR WILL CALL HER 4 MORE 01:TAI 686G2 1998-0391 NDA POND? 19118 130TH PL SE HOl.0-GPR WILL CALL HER 4 MORI: DETAI 686G2 1996,0391 R POND? 19118 130TH PL SE HOLD-GPR WILL CALL HER 4 MORE DETAI 68602 # 1996-0480 C CRKFLDS 13607 SE 192ND ? GROUNDWATER IMPACT WATER PONDI 686G2 1996·0~21 FCR R/D POND 13341 SE 195TH ST OUTLET PIPE OBSTRUCTED ASSESSMEN 6B6G2 1996-1428 C SWALE 18914 129TH PLACE SE OFFSITE FLOW IMPACTING PVT ORNG SY 686G2 1996-1428 NDA SWALE 18914 1fflH PLACE SE OFFSITI: FLOW IMPACTING FVT ORNG SY 686G2 1996-1428 R SWALE 18914 129TH PLACE se OFFSITE FLOW IMPACTING PVT ORNG SY 68SG2 1996-1550 C DRNG 19121 124TH AVE SE PLUGGED D/W CULVERT IMPACT TO PVT 686F2 1996-1694 C RUNOFF 13416 SE 1117TH WATER OVER SIDEWAl.1< GROUNOWATI: 68602 1997-0940 C DRNG 13007 SE 188TH PL GROUNOWATERISHEETFLOW PONDING fl86G2 1997-1179 C DRAINAGE 19113 121ST PL SE :NSTALLATION OF DRNG IN R/W OLD/OFF 086F2 1997-1179 NOA DRAINAGE 19113 121ST PL SE INSTALLATION OF DRNG IN RJW 01.DIOFF 58$F2 1997-1178 R DRAINAGE 19113 121ST PL SE INSTALI.ATION OF ORNG IN R/W OLD/OFF 686F2 1997-1301 C DRAINAGE 19125 121ST PL SE SUBSTANDARD INSTL Of DRNG SYS PVT 686F2 1997-1319 FCR DUI.APING 21709 146TH STE DUMPED BATTERY IN RIO POND 686G2 1995-0926 C DRAINAGE 19133 121STPL SE APPARENT OBSTRUCTION IN ROAD ORN 686F2 1999-0174 FCR CLGINLET 13415 SE 187TH PL I NL5T Pll'E Al'l'ARENTL Y bBSTRUCTl:D 686G2 1999-0449 C SPRINGS 13518 SE 186TH PL NEW SFR GROUND WATER INFIL ONTO P 686G2 1999-0632 C EASEMENT 19114 130THAVE SE INFO PROVIDEO ABOUT RIO POND ON PR 686G2 1999-0679 FCR FENce 18932 133RDPL SE L~ING Fl:NCI: NEEOS REPAIR 686G2 2000-0398 C DOM 12625 SE 192N0ST REQUEST TO DIVERT FLOW DISCHARGIN 686F2 2000-0735 FCR MNM 18000 134THAVE SE CEDAR SOARD FENCE AROUND PERIMET 686G2 2001-0548 WOP WOP 13120 SE 192NDST 686G2 20D2-0094 Fl REJ.1 13055 SE 192ND ST SWMl#J3 REMEASURE OF ORIGINAL 17. 7 t,UG2 2002-00S. FiR REM 13055 SE 192ND ST SWM#83 REMEASURE OF ORIGINAL 17.7 686G2 20,2-0204 FCR MMG 19000 134TH AVE SE 1) PSE UTILITY BOX DAMAGED. CALLE:D 686G2 2002-0424 C DOM 13003 SE 168TH PL SINKHOLE DEVELOl'EO APPARENTLY 0V 686G2 2002-0424 NOA· COM 13003 SE 188TH Pl. 51NKHOL5 DEVELOPED APPARENTLY 0V 686G2 Poge 2 oO SEP.1~.2004 2°0SPM KC WLR~ N0.102 F.3/3 btlllllllt : fYII ol ,.,.,-A-olflnldla £a8l1ll lnal'll8 Illa*' 2002-0424 R DDM 13003 SE 188TH PL SINKHOLE DEVELOPED APPARENTLY CV 666G2 2003-0266 C DDM 18759 130TH AVE SE LOCAL PONDING PROBLEM. MAY BE THE 666G2 2003-054(; Vc'OR WQB 18601 126TH PL SE 666F2 2003-0762 WQA WQAI 19433 VASHON HWY SW BIIAPS are ALL IN PLACE 686F2 2003-0909 WQC WQDR 1aoo1 126TH PL SE AUTO FLUID RESIDUE ON STl'<EET AS A R 686F2 Page :;ol3 APPENDIX B-1 DRAINAGE COMPLAINT ANALYSIS (previously submitted) SOOS CREEK PLAT DRAINAGE COMPLAINT ANALYSIS LEVEL 1 TECHNICAL DESIGN AND INFORMATION REPORT FOR PRELIMINARY PLAT REVIEW For the King County ODES: SUBDIVISION FILE _A03P0286_ Richard A Boston Addendum to Report of January 26, 2004 Boston Design and Development Co LLC 425-226-2145: Neal M Jacq_ues, P.E. Jacques Consulting 206-242-5322 Soos Creek Plat TIR 1 By Jacques Consulting March 20, 2004 TIR Addendum DRAINAGE COMPLAINTS King County records were examined for downstream drainage complaints per core requirement #2. Note that at the discharge point this project contributes approximately 2"/o to the drainage basin flow thus requiring ~ mile investigation. But this report investigated southeasterly for one mile aloog the Soos Creek Basin (see attached map). The area was inspected and the County complaint listings fur a one mile radjus were examined. The Soos Creek drainage basin in this area is relamely flat wide and heavily wgetated (gmss) with no erosion or flooding problems. The complaint list is attached but they all deal with issues which are uphill either west or east of the Soos Creek Basin. Only one was somewhat relevant, Complaint Number 96-1550, which is a class 1 issue (attached). This complaint in 1996, descnl>es the 18" culvert across 124th Ave SE at SE 192 as blocked and thus erosion over the 124111 gravel road. The sohrtion, to unbkick it, was done. The downstream flow fiom this project does not flow in thi" location but because the project access road goes over it, it was included. In February 2004 property ownen; were notified of King County's plan to widen SE 192 for a left tum lane. thus this culvert will likely be modified. The subject project final engineering will have consideration for the revised County intersection design. The remainder of the complaints had no relation at all with the project. The five page list and a map showning location of the most significant problems (eight ponding/ffooding complaints) is attached for general reference. These all involved tributary flows ftom west or east down into drainage systems flowing eventually imo Soos Creek Basin. None have any relation to this projects drainage in the Creek itself. In conclusion, for the subject project drainage path, there is no indication of any category I, 2, or 3 issues with drainage within one mile downstream. Note the TIR downstream analysis dated Jan 26, 2004 for additional discussion. Soos Creek Plat TIR 2 By Jacques Consulting March 20, 2004 5oos C'R~EI<. 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SE1112NOST &8IIF2 191'8«1a> C PONDING 19148 121STPLS£ l:ASJ' OF BENSON~ 88flF2 1871MJ081 C DANG 19241 12tSTPlSI! llll6F2 1978-«IBS C FUJQ II092I 120TH AVE SI: BACl<VAAD 88&"4 1981-111181 C DANG 19817 122ND PL SE 8l.OCIQ:Dl£AST HILL AREA eaaF8 1881,0215 C DRHG ,.,, 122NDP1.SE CIB CAVING IN 68IIF8 1!1111,0920 C R.08 aase, 120Jff A.VE SE PANTtfER U(NEJI 886F4 1911:Ml539 C A.DG 1ll&OO SE191!NDST EAST KENT AREA 6861'2 - 1889 0484 X DANG 12Sll8 SE2Q2NOPL Sffl'EM MAINTENANCE BF& tlllloHOll1 C l)ffG 2111158 12111MAVS SE DITCHAWJ«S 68111'4 11194-«1813 R FLOG 191 SE 1111!ND ST TO ROADS DIVA 6'IF2 19114,11314 C R.DB 13280 SE1!l1NDST SE 1112ND ST11S4'TH AVE se 8881'2 1981031o1 C DANG SE2I04TH S'T/IM'FH AVE 68aFS 19111H>1FO C FLDG 18517 SE 200lHST STORM fE.ATED 688G4 191&(D77 E DRNG 12II02 SE ll081liST VI.TRCRTDPROll. Bloa<E>ORIVEWAY llll&F4 181$9 C FLOG 198117 1311THPL se EROSION 881183 19116 0IS:2 C DANG 13250 SE 1a2N>ST DRAINPIPE 888G3 11811D&:!12 EA DANG 1S250 SE 1111NDST PA08CRTD BV PflMT fNW e8IIGS 188H1112 C OFIMG 1ZMO se 20lfflt ST toWlfl'9WICE OF LOf 68llF8 1 ... 1180 C FlDG 111418 SE 20Q1HST LAND 1H A.000 PLAIN 11LOC1<a> PIPE 68IG4 1181-11112 C DANG 1SIV3 61! llGOTHSf SEl!.11&,114$,IJIOQ.0491,1M91!,1119t7 llll8G4 1118f-11111t ER DAr«S 187119 se 20IJTliST (08 PL'T} PROB COfl. 689G4 1987-o:MS C fU)8 211136 127THPL SE WATER FROM NEIGI IIORS 117.(1118 68IIF9 1917-o300 C DANG 131111 se 201STST DOWNSPOUTS ..arCONNE:aTED TO DAN llll8G4 111117-«IDO EJII VIOLATE 13101 SE l!OISTST SEE8&-11ae,11<1S87.olln.ll317,0481! eaeG4 19111-cxt!T C •. Fl.DB 181111 SE 2.o'ISTST DOMISPOUTS NOT CONNECTB> 11,0.,00 lillllG4 1tlNM9I C FLOG 13100 SE 1!111!ND er DOWNSPOUTS•1'M11.11B2l7~7. 111184 1987-G481 NIJII (D&,Pl.1l SWMDIDIDNPAOB &888' 1887'°'82 C FLDQ 1311:12 SE 2DIN>CI' DOWICSI OUTSa&,11411,11B2l7-o3DO.S17, 8IIIG4 1911-o&1S C DITCH 1'407 12Jffll A.VE SE OflAINAGE Dl1Qt ON PAOPER1Y 8IIIIF3 111117..oact C DRNCll 194IIO tacntAVE se EASSBIT ENaOSIN8 DITCH llllllG3 (!j 11187'°918 C DRNQ 211238 'U!71>I PL SE WA'TSI UNDER HOUSE 17-o1141 li86F4 , 1987-118118 C ONIG 1•10 SE lllltl)PL 11.lEGAL AU. IN SOOS CAeE1< -11181-1049 C TO FIi> COOFID 04/27187. BR 1811 PR C DflN8 -182ND AVE SE WAT&fl FAOM NEW DEVEI.OPEMEN1" 1181184 l'lllle1 d5 -t"t-l'C. n:a. a:mq , :, ~ .:um ·-.... ~ ................ C ct I I "" ....... ..... HIia ...... .... -1988 C • C A.De 1114a1 1amiAVE SE NEW DRIVEWAY WIU. rr ROOD 888F2 1918 D2:!18 ER PIPE 111481 111fflt AVE SE NlzD &:XTENSION OF 48" CULYEl'IT 8eeF2 19118 Oll39 C OFWG \37$1 SE IIDIIN>PL WA.Tai FROM Cll.8NED UP CAEEX ll8IIG4 1811802"6 C DANG 1111116 133ADAVE SE UNFENCED AIO POND/INFO CY TO SWM-F ll8IGlJ 111118D15311 C DANG 19412 189THPI. SE NEARSOOS~~a.ENW'IG -1S88D5SI C DANG 2II002 11ffltAVE se FIL IN WErLAND8 li8IF3 19880906 C OANS 19122 183ADAVE CtN. a.ocKAG6'NEW CONSnWCnON 888G3 111118 ll808 E DANG 191122 138RDAVE NEWDRAINAGE Svsat -1-,0003 C DANG 11Nit2 t211THAVE $E ,INCRl:ASED RUNOfF>'Cl1ANNE 11881'2 191H011 C DANG 19480 tMTHAVE SE" om:H~ 1111A 19890049 C DFIMEI 20R8D 1811NDAVE SE (M)FOREST GLEN)SOOS A.oOD PLAIN 68864 19111,-0t 112 C DANG 111112 121Jlff A\'E SE X PIPE NOT\WAICING ..-z 19ll9Da2B C DANG ,ame SE ll04THSf BUIIJ>ER OF HEW HOME WuklED FILL .... 1889-0410 C DANG 12213 SE 11mHST PONDING ... EIRAIMAGEEASEMelf UIFt© 191111 06113 C DANG 14439 143ADPL SE CONST ON Nl:WtfONEIWETYNfl) l8IIG8 19890554 C DANG 1Zi!25 &e 2DfflfST l!AOS10l'1 OFYAflDS IN Hli!lll l'lAT 11811'4 1aDlill0 C Dl'ING llD50B 123ADPL SE DOWIINSl'OUTB ERODl'IG YAFG 8IMli84 88111'4 19119-01164 C EROSION -11!3ADPL SE NEW HOME DOWNSPOUTSOPEtf 888F4 11*Mll!21 C DANG \8711 SE 189THPL DfWtiPIPl!;FUU.JSroAM . ~ 1 lllll),0430 C FLOG 13715 SE GN)PI. CFIEEIC R.OODs:> HOUSEISJ'DRM . . 111900194 C DANG ,aa SE llDlffit sr STOIN -1990-0494 MM DRQIAGE 1Mt SE IIDIJl'HST AATUIW. r&FIISTAAStf MCl<HM AEV 6llllG3 19111Hl16t ER loWltOI.E 1NIO 8E201ST'PL FAII.URiHJNDA CREST Pl.AT lllV 1 a 2 88111'3 19111Ml811 C Clll 13719 SE tlllmt PL IN YARD. 0VERFL0. 8CM>t84,121 . G88Ga 1Bll>0810 C FLD8 11MD8 SE llllNOPL WATI.R FROM NEW DEVELOPeMENr 6IIIF4 1990-1001 C R.DG 19412 131'tff PL SE .at YAPIJ S' DANG PIPE 68183 1 IIIICHGl3 C DANG 1211115 SE 11NmfST SPflNG ttU. ONYl!Tctf Hen' lllWNl«il 68llfll 1990-1190 C WTRQTI.Y 19&00 138flDAVE SE 11AN1C STAIIIUZ\~ PI.AYIIG IEA &88Gt t!l!I0,1B C DANG 181112 13fflfCT SE Q FIJIINGOFU>TIDITClf MAINT 881161 1990-1486 C EAOSION 1III01 SE lll'IST'Pl. UNDACAEST 11111A 1890-'lffi SE ST\IDY 11110t SE l!lnST Pl.ACE S'RIDY'OFAAEA MF4 1IIIIO-ta C'. R.06 11M08 SE 2112NDPL WA'ffll ON FICWW~CREST"ST ll8IIR 1IIII0-16'12 X DANG . 12IDI SE 2D1SJ'ST e UNDA CAESTOIV H MIF4 (!p 1111tHJ178 C FLDGl&IO 1901 se 1tmfST ---POOUNQOFWATER 19!1'1-<1178 Efl FLDGl&RO 1111111 SE 1111mtST PU1GGt!D PNll'ATI! PIPE -1991-0,79 SA A.DGIERO lllOI SE '1981ltST HCUECWSI I.OT 8l8G,1 l89Hl291 C FLDEl 1111811 121STAVE SI: Ol/l9IFI.OW OFF PIPES 1811'3 ,.., ... SR FLOG 191195 121STAYE. SE FEFER TO IIALD llll8FS 1891-Q412 C DANG 11151111 t*IROAVli SE SIOSIOftOF ACeSS ROAD ll8G3 l911-o4111 C FLDG. 11100 SE 1971l1Sf WASHQU'f'QF~ 11881'3 l'lgellc,15 -: --l'll'R.10.2004" -5:37PM KC l,LRD r 1 111 ....... ........... --..... -1991-1)446 C f\.D6 18688 140\1fAVE Sill INFO TO RDS/WAI B..EAOSION IN YI>«> 68eGS 1!1111-41512 C RD8 200N 1MTNAVE SE CATCH BASIN LEAICSIOYERfLOW IIIIIIF4 1991--0518 C i'LDG 13«!0 SE zoantST 1111884 1991-41518 NtM. FI.DG 13490 se 2Glll1i sr 10CIP G8IIG4 18111-0518 PN FLDG 13480 SE IIIOJHST TOCIP 88IG4 1991-G519 C WTASIN 20813 1!21\DAVE SE WATER OVER SIDEWALK ll6F4 1891419 E WTRSNf 20313 WJNOAVESE Olll9WM DIV PLY ..... 1!191.Q579 EH \Ymf!JIN mt1S 1ll2NDAVE SE OHISWM DIV PLY 8118N 1991--0680 C AJlG 20IIOG 1MTHAVE SE SMALL DRAIN SYSTaA CLOGGED 8ll8F,1 11191-11798 St FUIG 12408 se 202NDPL eaeF4 11191-1005 C DRAINAGE 112111 SE 191THST PONDINBINYAflllFENCM) ~ 1911-11168 C tlRAlfW3E 18114 se 200THST' -WA'Tel IN CRAWL SPACE &8IG4 (f) 1!18Mlllil SR ~GE 13114 SE IIIIIITHST NOTNDAP eaa&f - 111112 IIIIIIO C EA08ION 19513 1S3ADAV& SE HOIIIEOWNERS POND O.F. tNG.1 19911 01100 NOA ER08ION 1811 SE 191T'Htrr ttOlolSO .. NEFIS' POND O.F. -11191! 1X1CO SR EROSION 1911111 1SlfW>AVI! SE IIOI S~WNEIWl'ONDo.F. ll8IIG3 19112 &PS S3 &TUOY CIJlllERT UP6f'ADE 68IF4 19'H310 C DANG' 1881111 13ffltPL SE WE11.AND~INCN.W 88IG3 1-.m10 IOI. DANG 1!111S! 1MTH.PL SE W&'JI.AM)~INCMW -t90!Hl810 RN DANG , .. 13'THPL SE WETlAND~INCRAW Ull83 ,aesmes RN FLD8 20k1 117THAVE SE IJPSt1IEAM DEVELOPMENT 8IIIIF4 1911M412 C Df1NG \ll800 tarot PLACE ·" SE Wf!1\AND CAUSING DII/ERSION 8IIIIG3 1!ID0412 NDA DANG 19&0D tlM'Jlt PLACE SE WETLAND CAUSINGDIVEJIISION 8ll8G3 1~12 AH' DANG 18800 13fllt Pl.ACE SE ~ 1911Ml577 C DANG 1ll'1MS SE QNDPL. PONDING IN YN'O J 1111H577 NOA DflN8 137MS BE 2112NDPL NEWPI.ATWI.LHIUA SB 1911U577 AN DRNG 13746 SI: 2.0IINDPL POl'ON81NY~. MW'-C 19118 Oli8II E EROSION ,.., se 2111STPL 6IIIIGS 1993-0580 ER EFIOSION 12IIIO SE 20'tSTl'I.. 68IGll 119H591 C FLDG 20402 132JIIDNIE SE lilAOSION FROM 11iE PLAT CJF GRAYSTON 118884 1!111N1i91 Ai:' FU)Q 2IMCII 131NDAVE SE 1!AOS10M FACU lJ1E Pl.AT OF GAE'IS10N 8111113' 1SU-C511! C DANG 12:tlll SE .antST SURCIWIOE ffal CIB ll8IIF4 fflfllHml4 WQA ooa.iNG . 1l!58'1 SE IIIIIRD PLACE TO*" 1181'4 188&0794 WQC DI.M"ING 1lllG1 SE :I.DR) Pl.ACE TOWO,. INF4 191M 1)1188 C DIM 1IIIIO 11111i Pl. SE ACTIIIEGIWllNG VIQUITIONl.936Wll8 IIIIG3 t!IIM-0118 C DANG 2IIOMII 131STPl. SE BRCkEH MAII.BOXPOSr 881164 19114 0321 C INQUIFf{ 12525 Sli ll8'ID PIACE Aloff PIPES IN Y lllfD WHl!R! SHE WLL DI 68IJF4 11194-0C31 C PONDING 129112 SI: l!a.!NDPL POM*G IN GUTTER G8IIF4 111940821 WQC ~ 18862 1311N> PL SE -19'•' I WQ£ OUNCII 118112 133RDPL SE 6llllG3 PagtSall KL M..t<IJ •• ..,,. .a.-,, C J I I 1'91 -.r-..,. -·-n-... ., ..... ...... 1~ C F1llM 19M-07113 NOA Fil.UNG 1ll96-0048 C DRHG 19115,01176 C DANG 182NOAVE 132N>AY£ 1Ml'H """' 1fflHAIIE 1MlHAVE 111STl'l SE FILL Pl.ACED wmllN SEWER VGCEMT SE FILLPINJED WITHIN SEWER EASEMENT SE WOAKNWl!t\.ANDS CONT'ACrAINSLE SE GAOUIC>WA'TERIPVTDIWN SE WEl1.N«> ON 118 PROPEflTY 199110587 l( 1985-01k C 1!1118 C1120 C 19118 IKl81 C ttlllf-0245 C 11111H789 C 1118M788 tl>A 1891H11118 R M> POND 1909 SE 1111TH sr SE DIWN ClEAN-OUTOONSTMWrr M.U8GEDCU.V&m' M> DISCHAA6E PIP AID PCNO 2'r!i5 124'nt AVE SE DOrtiiSlflEAM lMPliCT' FA0M RID OUl1E U8R RUNOFF 1115211 112NDPL SE SFRIN8HltLE'LEMENl'"AIW INFOAIJSDI WI! FLOO 1U82 SE llllffliSf PIOOOIHADUETOSJOAMANOSUIISTN ~~A\ FLOG 12282 SE 20ll1119T -----FLOODING DIA!lOSIORM AHO SUIIS'lll 11111A l.!.J FU>G 122$2 SE 2111nliST FlOODINGOUElOSTOAMANDSUBSTllltWcu.v&ITIMPACTTOP111' '\. .. 199&-11135 C DANG ~ 124THAVE SE flOADIMPflCNEMENTPl'IO,Ec;fw,cf aeF8 1988-1813 WOO DlM'fNG 'IBl8 SE 1115TH ST WAEa<ED VEH IN RO FM:IUTY D81+14 ll8IC3ll 1119&-1908 E M>l'CND 111918 SE 2SltlD PL FENCfiliNCAC>MlftMS,PINTOTJWrr IIMF8 11111'1-o591 C 1917-GB38 A.A FAC.OOM 1917-o?6S ~ RDPOND 1997-1179 C DR.'UN<t.6E 1&87-11711 MDA Of\..,,. 11181'-1179 R OMIN~ 1987•1301 C DRNNf,GE 19117-1505 C TftEES 1987-1530 FCR M> 1997-1512 C TREE 1991M1108 WQ; OLSPLL 1111 ,223 FCA FENCE 111118-11381 C DIWNAIJE 198110891 FCA DAAINAGE 1a as.a FCR RDPLUQD 1111111 D S 8 C 1 ' DRANAGe 18 06m C FENCE 1911H111& FCR Pl JQGFD DDM 2000-0415 C MNM 20IJ0.05D1 FCR MIIB l!OOl>071S C ODIi 21JD0-1111S NO,\. 00M 2111»07'18 R DOU 130llfl SE l!081lt PL PWGGFJ) PRIVATE YARD DRAIN TA PAO ll8IGC 133RD AV£ SEO SE 1911-191TH IClD8 ACCES$ OYEflFlOW PIPE NEED TA G8IIG8 19125 1SIIAD PL SE WINDFALLS AD.I TO POND PAAKS NI/CL fi8IIG3 19118 12'1STPL BE INSTALLATIONOFIJRNGt,IA/W OLQ.()FF ~ 11118 121ST P\. 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'11MCl' 8811H 18815 1SIADAIIE SE l:WIWBETOM>POND FROJ.EIS1180RH l89BS ~= : = ----: ::::=.-...~~ :1!r::J@ 111232 SE 2IIOfH ST INCfEASE AaMS NPACTIN8 DIWfWlE _,r ,..4cl5 --· --. tm.10.2004 I 'IV • .LCl't# ' ·--... ----. C L IL I .... __ ..... ... ., .... ... ... ..... -l!OO'l-0214 C 00M 2111113 tl!llllf AVE SE UYUTVWORK DAMAGSl SlUB OUR DRA .,... l!IIO'l-o41S WQC WQ8 12232 SE l!Cllmf Sf OONC81H Of' SOAP SUDS 8EIICG D1SCNA 88IIF8 2001-otlill WQC WQB 1Zl13 SE 18&l'HST Al'PUlENr I.ACK OF POI.WTN« CONTR IIIIIIF'8 2001-otSS WOA WQ8 12313 S£ 19111),t ST APPAflEN1' LACK OFPOUJJT#ff CONTR tll8F3. IOOHM71 FCft t,No1 IIOll35 'ISTIMAVE se VEGEfAlJON GROWT1i H&AV&lTHAN M 8811M 2001--.W FCC WQO 1ZCSO SE 2lllfflt ST APPAA&NTDUIFINBOF PAINTOR t? INT 8861'4 20Dt-GD2 WOfl WQO 1IMIIO sa 2IIITtl sr APPARENT DIJMPM OF PA!Hr Oft?? INT _,.. IIOOIH029 C DrA 1811118 se liOOl'tlST INl'OAMATIOM FISlUEST AE&rJDNG F'O taG3 ilODM2&I FCA BSR III03IIII 1318TPLSE III08WALE RE1l'IC.W'tr &88Q4 l!l)02-Gl68 flE1' BSR 20.lliG 131STPl.S£ 8I0-8WAlE AETRO-RT 118884 20DN4l8 C WM 121135 SE 191JTHST FIEQUUT'TO FIEUOVETl&S CN COUNT 9IIIR 2COMIIDl.t DOM I.AICI! y EOF131N> APPARENTBEAYEfl ICrMIY IN S008 C 811164 200IHIIIIJIS C DOM LAICEY EOF132ND APPARENT BEAi/ER ICTMTY IN SOOSC 911184 2llllt-4J803 NOi,. DOM LAKEY EOf182ND APPAl'l&Nf BMVER ICFMrY IN SOOSC ~ 20CJIHIIOI A DOIi I.AICEY EOF132NO APPAN!Ht' BEAVER N7fMrv IN SOOS C 8IIGG4 20GIM545 WQR WQ8 1880J 1261'HPLSE ll8IF2 IIOOM7a WOA WQAI 19433 VASHON HWY' SW BMPS ... ALL IN PLACE l8lf2 2DDa,(J8QII WQC WIQDA ,., tlfflf Pt. SE Al.ml FWID AESIDUE QNSJllEET ASAR ll8IF2 2004-018$ FCA MNt,t 12115 SE 2!lll'nl Pl. 8811'4 l 1'95d5 APPENDIX C ANALYSIS AND DESIGN lrLlEQJJ\Yl[E [D)[E~ -~1(0)~ L[E~ I ~(O)(@ ~[EfR1 [PJL~ T~ [E)X(~~lJ~~(G] ~~1f[E \ r\ l -~~-~~~~~~._/ \ ;E;;:.,-I \ J \ \ \ \ \ _c-- '~f;i~~;l1i:!,'.'~~i1,~~---::;::_::=:,t.·'.:".~~-~~=--~"z: __ -~=,=;.'::G~G~E.:::_R,--. ;,'.:. :;=.:~'.:;=-.~:-_-::=;_i;::=.:;:-=-~=-~~-~!:;;-::-j··~~;::1;.::~~~.:::-:_, EXISTING SITE: FOREST: 303,801 (6.97) BUILDING: 1,364 (0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) TOTAL: 334,208 (7.67) N EB 0 I 75 / 150 : SCALE: 1" = 150 ft. ·rrLrEQJJ\YJ[E [[][E~ -J(O)~ L[E~ I (C(O)~ j[E[Rl rlli u~ [P~(O)[P(O)~[E[D) ~~[J[E \ 't--,\'!f"t --r--=~ -__ , J't· _...:.._ __ \ OGGER N EB PROPOSED SllE SF (AC): BY-PASS SF (AC): 1-\ \ \\ -\ \ \ \ \ FLEU~ DES· VOILES\ \ \ I C ' \\ \ l 'z -\ \ ~-- \ \ \ '!! 0 75 I I 150 : BUILDING: 4,592x47x0.7 = 151,077 (3.47) PAVEMENT: 55,367 (1-27) PAVEMENT: 14,864 (0.34) TOTAL: 14,864 (0-34) SCALE: 1" = 150 ft. POND: 14,000 (0.32) LANDSCAPE: 98,899 (2-27) TOTAL: 319,343 (7.33) ROOF AND D /WS: (70% OF LOT AREA OR 4,000 SF -'M-llCHEVER IS LESS) KCRTS Program ... File Directory: C:\KC_SWDM\KC_DATA\ [CJ CREATE a new Time Series ST 6.97 0.00 . 0. 000000 0.00 0.00 0.000000 0.39 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.31 0.00 0.000000 exist.tsf T 1. 00000 T [CJ CREATE a new Time Series ST 0.00 0.00 0.000000 0.00 0.00 0.000000 2.27 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0 .00 0.000000 0.00 0 .00 0.000000 5.06 0 .00 0.000000 dev.tsf T 1. 00000 T [CJ CREATE a new Time Series ST 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.00 0.00 0.000000 0.34 0.00 0.000000 bypass.tsf T 1.00000 T [Tl Enter the Analysis TOOLS Module [Pl Compute PEAKS and Flow Frequencies exist. tsf exist.pks [PJ Compute PEAKS and Flow Frequencies dev.tsf dev.pks [Pl Compute PEAKS and Flow Frequencies bypass.tsf bypass.pks [Rl RETURN to Previous Menu [X] exit KCRTS Program pond. exc Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Wetland Impervious Page 1 Fleuve des Voiles & Cogger Plats Runoff Cales 3/29/06 Flow Frequency Analysis Time Series File:exist.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak ICFS) 0.519 2 2/09/01 18:00 0.198 7 1/05/02 16:00 0.444 3 2/28/03 3:00 0.085 8 8/2 6/04 2:00 o. 261 6 1/05/05 8:00 0. 425 4 1/18/06 16:00 0.388 5 11/24/06 4:00 0.745 1 1/09/08 9: 00 Computed Peaks Flow Frequency Analysis Time Series File;devlS.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 2.34 6 8/27/01 18:00 1. 64 8 1/05/02 15: 00 4. 96 2 12/08/02 17:15 1. 88 7 8/23/04 14: 30 2. 76 5 11/17/04 5:00 2. 77 4 10/27/05 10:45 3.25 3 10/25/06 22:45 7.01 1 1/09/08 6:30 Computed Peaks Flow Frequency Analysis Time series File:bypass.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.082 7 2/09/01 2:00 0.073 8 1/05/02 16:00 0.100 3 12/08/02 18:00 0.084 6 8/26/04 2:00 0.100 4 10/28/04 16:00 0.088 5 1/18/06 16:00 0.123 2 10/26/06 0:00 0.161 1 1/09/08 6:00 Computed Peaks Level 1 Det Pond I 4' deep) Qmax == (4/3*0.261)-0.084 0. 26 Ht== 3/4*4 -3' sumpks.txt -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 0.745 1 100.00 0.519 2 25.00 0.444 3 10.00 0.425 4 5.00 0.388 5 3.00 0.261 6 2.00 0.198 7 1.30 0.085 8 1.10 0.669 50.00 0.990 0.960 0.900 0.800 0.667 0.500 0.231 0.091 0.980 -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 7.01 1 100.00 4.96 2 25.00 3.25 3 10.00 2.77 4 5.00 2.76 5 3.00 2.34 6 2.00 1.88 7 1.30 1.64 8 1.10 6.33 50.00 0.990 o. 960 0. 900 0.800 0.667 0.500 0.231 0.091 0. 980 -----Flow Frequency Analysis--------Peaks Rank Return Prob (CFS) Period 0.161 1 100.00 0.990 0.123 2 25.00 0.960 0.100 3 10.00 0.900 0.100 4 5.00 0.800 0.088 5 3.00 0.667 0.084 6 2.00 0.500 0.082 7 1. 30 0.231 0.073 8 1.10 0.091 0.148 50.00 0.980 Page 1 Fleuve des Voiles & Cogger Plats Preliminary Detention Sizing Date: 3/29/06 Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Detention Pond 3.00 H:lV 184.02 ft 61. 34 ft 11288. sq. 19549. sq. ft ft 0. 449 acres Effective Storage Depth: 4.00 ft Stage O Elevation: 0.00 ft Storage Volume: 57698. cu. ft 1. 325 ac-ft Riser Head: 4.00 ft Riser Diameter: 12.00 inches Number of orifices: 2 Orifice# Height (ft) 0.00 3.00 Diameter {in) 2.19 2.34 Full Head Discharge (CFS) 0.260 0.149 Pipe Diameter (in) 1 2 Top Notch Weir: None Outflow Rating Curve: None stage Elevation Storage (ft) (ft) (cu. ft) (ac-ft) 0.00 0.00 0. 0.000 0.02 0.02 226. 0.005 0.05 0.05 566. 0.013 0.07 0.07 794. 0.018 0.09 0.09 1022. 0.023 0.11 0.11 1251. 0.029 0.14 0.14 1595. 0.037 0.16 0.16 1825. 0.042 0.18 0 .18 2056. 0.047 0.28 0.28 3219. 0.074 0.38 0.38 4397. 0.101 0.48 0.48 5589. 0.128 0.58 0.58 6797. 0.156 0.68 o. 68 8020. 0.184 0.78 0.78 9258. 0 .213 0.88 0.88 10512. 0.241 0.98 0.98 11781. 0.270 1. 08 1.08 13065. 0.300 1.18 1.18 14365, 0.330 1. 28 1.28 15680. 0.360 1.38 1.38 17011. 0. 391 1.48 1.48 18358. 0.421 1. 58 1.58 19720. 0.453 1. 68 1.68 21099. 0. 484 1. 78 1. 78 22493. 0.516 1.88 1.88 23903. 0.549 1. 98 1. 98 25330. 0.581 2.08 2.08 26772. 0.615 2.18 2.18 28231. 0.648 2.28 2.28 29706. 0.682 2.38 2 .38 31197. 0.716 2.48 2.48 32705. 0.751 2.58 2, 58 34229. 0.786 2. 68 2. 68 35770. 0.821 2.78 2.78 37328. 0.857 2 .88 2.88 38902. 0.893 2.98 2. 98 40493. 0.930 3.00 3.00 40814. 0.937 3.02 3.02 41134. 0.944 3.05 3.05 41617. 0.955 6.0 Discharge Percolation (cfs) (cfs) 0.000 0.00 0.020 0.00 0.028 0.00 0.034 0.00 0.039 0.00 0.044 0.00 0.048 0.00 0.052 0.00 0.056 0.00 0.069 0.00 0.080 0.00 0.090 0.00 0.099 0.00 0.107 0.00 0.115 0.00 0.122 0.00 0.129 0.00 0.135 0.00 0.141 0.00 0.147 0.00 0.153 0.00 0.158 0.00 0.164 0.00 0.169 0.00 0.174 0.00 0.178 0.00 0.183 0.00 0.188 0.00 0.192 0.00 0.196 0.00 0.201 0.00 0.205 0.00 0.209 0,00 0.213 0.00 0.217 0.00 0.221 0.00 0.225 0.00 0.225 0.00 0.227 0.00 0.233 0.00 Surf Area (sq. ft) 11288. 11318. 11362. 11391. 11421. 11451. 11495. 11525. 11554. 11703. 11853. 12003. 12154, 12306. 12458. 12612. 12766. 12920. 1307 6. 13232. 13388. 13546. 13704. 13863. 14023. 14183. 14344. 14506. 14 669. 14832. 14996. 15161. 15326. 15492. 15659. 15827. 15995. 16029. 16063. 16113. 3.07 3. 07 41940. 0.963 0.241 0.00 16147. 3 .10 3 .10 42425. 0.974 0.251 0.00 16198. 3.12 3 .12 42749. 0.981 0.264 0.00 16232. 3.15 3 .15 43237. 0.993 0.279 0.00 16283. 3. 17 3 .17 43563. 1. 000 0.293 0 .00 16317. 3.20 3.20 44053. 1. 011 0.298 0.00 16368. 3.22 3.22 44381. 1. 019 0.303 0.00 16402. 3.32 3.32 46030. 1. 057 0.321 0.00 16573. 3.42 3. 42 47695. 1.095 0.337 0 .00 16744. 3.52 3.52 49378. 1.134 0.351 0.00 16916. 3.62 3. 62 51079. 1.173 0.365 0.00 17089. 3. 72 3. 72 52796. 1.212 0.377 0.00 17263. 3. 82 3.82 54531. 1.252 0.389 0.00 17437. 3. 92 3.92 56284. 1.292 0.400 0.00 17612. 4.00 4.00 57698. 1. 325 0.409 0.00 17753. 4 .10 4.10 59483. 1. 366 0. 727 0.00 17929. 4 .20 4.20 61284. 1. 407 1.300 0.00 18106. 4.30 4 .30 63104. 1. 449 2.040 0.00 18284. 4. 40 4. 40 64941. 1. 491 2.840 0.00 18463. 4.50 4.50 66796. 1.533 3.130 0.00 18 642. 4. 60 4. 60 68670. 1.576 3.400 0.00 18822. 4. 70 4.70 70561. 1. 620 3.640 0.00 19003. 4.80 4.80 72470. 1. 664 3.870 0.00 19184. 4. 90 4.90 74398. 1.708 4.080 0.00 19366. 5.00 5.00 76344. 1.753 4.280 0.00 19549. 5.10 5.10 78308. 1.798 4.480 0.00 19733. 5.20 5.20 80290. 1. 843 4.660 0.00 19917. 5.30 5.30 82291. 1. 889 4.840 0 .00 20102. 5.40 5. 40 84311. 1.936 5.010 0.00 20288. 5.50 5.50 8 634 9. 1. 982 5.170 0 .00 20474. 5.60 5. 60 88405. 2.030 5.330 0.00 20661. 5.70 5. 70 90481. 2.077 5.490 0.00 20849. 5.80 5.80 92575. 2.125 5.640 0.00 21038. 5. 90 5.90 94689. 2.174 5.780 0.00 21227. 6.00 6.00 96821. 2.223 5.920 0.00 21417. Hyd Inflow Outflow Peak Storage Stage Elev (Cu-Ft) (Ac-Ft} 1 2.87 1. 99 4.29 4.29 62984. 1. 446 2 1.43 0. 92 4.13 4 .13 60102. 1. 380 3 1.89 0. 41 4.00 4.00 57663. 1. 324 4 1.52 0.38 3.71 3.71 52577. 1.207 5 1. 71 0. 36 3.56 3.56 50040. 1.149 6 1. 01 0.22 2.80 2 .80 37609. 0.863 7 1. 31 0.17 1. 65 1. 65 20723. 0.476 8 1.18 0.18 2.00 2.00 25571. 0.587 Hyd R/D Facility Tributary Reservoir POC Outflow Outflow Inflow Inflow Target Cale 1 1. 99 0.16 ******** ******* 2.05 2 0. 92 0.08 ******** ******* 0.97 3 0.41 0.12 ******** 0.44 0.44 4 0.38 0.09 ******** ******* 0. 41 5 0.36 0.10 ******** ******* 0. 38 6 0.22 0.06 ******** 0.26 0.26 7 0.17 0.08 ******** ******* 0.23 8 0.18 0.07 ******** ******* 0.21 ---------------------------------- Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdout POC Time Series File:ctsout Inflow/Outflow Analysis Peak Inflow Discharge: 2 .87 CFS at 6,00 on Jan 9 in Year 8 Peak Outflow Discharge: 1. 99 CFS at 10,00 on Jan 9 in Year 8 Peak Reservoir Stage: 4.29 Ft Peak Reservoir Elev: 4.29 Ft Peak Reservoir Storage: 62984. Cu-Ft 1. 446 Ac-Ft • Add Time Series:bypass.tsf Peak Summed Discharge: 2.05 CFS at 10:00 on Jan 9 in Year 8 Point of Compliance File:dsout.tsf Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks --Rank Return Prob (CFS) (CFS) (ft) Period 0.924 2 2/09/01 16:00 1. 99 4.29 1 100.00 0. 990 0.184 7 12/28/01 17:00 0.924 4.13 2 25.00 0. 960 0.356 5 2/28/03 7,00 0.409 4.00 3 10.00 0.900 0 .168 8 8/26/04 6,00 0.375 3. 71 4 5.00 0.800 0.218 6 1/05/05 15,00 0.356 3.56 5 3.00 0. 667 0.375 4 1/18/06 23,00 0.218 2.80 6 2.00 0.500 0.409 3 11/24/06 8 ,oo 0.184 2.00 7 1.30 0.231 1. 99 1 1/09/08 10,00 0.168 1. 65 8 1.10 0.091 Computed Peaks 1. 64 4 .25 50.00 0.980 Flow Frequency Analysis Time Series File:dsout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.965 2 2/09/01 16:00 2.05 1 100. 00 0.990 0.205 8 12/28/01 15:00 0.965 2 25.00 0.960 0.384 5 2/28/03 5,00 0 .444 3 10.00 0.900 0.226 7 8/26/04 2,00 0.412 4 5.00 0.800 0.257 6 1/05/05 0,00 0.384 5 3.00 0.667 0.412 4 1/18/06 21~00 0.257 6 2.00 0.500 0.444 3 11/24/06 6,oo 0.226 7 1. 30 0.231 2.05 1 1/09/08 10,00 0.205 8 1.10 0.091 Computed Peaks 1. 69 50.00 0.980 Q) e> m ..c 0 . !!! Cl 10 "' 10 "' 0 rdout.pks in Sea-Tac • dsout.pks c exist. pks • 0 C • 8 Return Period 2 5 10 20 ,, . .., ·>oo ___ _ 1 2 5 10 20 30 40 50 60 70 80 Cumulative Probability 90 95 50 100 98 99 Treatment Pond Sizing Routine Project: Fleuve des Voiles & Cogger Plats Treatment Pond Date: 3/29/2006 Blue represents manual entry fields Red represents calculated fields Step 1: Wetpool volume factor (f) ... either 3 or 4.5 f= 3 Step 2: Mean annual rainfall (R) ... from Fig. 6.4.1.A, pg 6-69 R= 0.47 in Step 3: Runoff (Vr) ... Vr=(0.9Ai+0.25Atg+0.1 OAtf+0.01 Ao )xR/12 Ai= Atg = Atf= Ao= Vr= 220,444 sf 98,899 sf O sf 0 sf 8,739 cf Step 4: Wetpool volume (Vb) ... Vb=fVr Vb= 26,217 cf Step 5: Wetpool dimensions ... Vb=h(A1+A2)/2 Solve by trial & error A1= 15,995 sf L= 73 ft 3L = 219 ft h= 4 ft S= 2 ft A2= 11,578 sf "Vb= 55,146 cf *if Vb calculated in Step 5 < Vb from Step 4, then increase h Drainage Cales FV.xls (Treatment Pond) 3/29/2006 APPENDIX D MAINTENANCE REQUIREMENTS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES • MAINTENANCE AND OPERATIONS MANUAL FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES ADDRESS: 16217 114th Avenue SE Renton, Washington RETENTION/DETENTION FACILITIES The purpose of both the detention pond is to reduce the rate of runoff from the developed portions of the property. Water can flow freely into the pond, but orifices in the outflow riser restrict the outflow. When the inflow exceeds the capacity of the orifice, the excess water is "stored" in the pond, and released slowly after the storm abates. In order to function properly, the facility must also be kept free of accumulated sediment. The outlet and connection pipes also must be kept clean, as even a partial blockage could significantly impact the ability of the facility to store runoff. The facility should be visually inspected for sediment accumulation and blockages at least once each year and also after every major storm greater than or equal to a 10-year return frequency. WATER QUALITY TREATMENT FACILITIES The purpose of both the permanently wet portions of the pond and the cartridge filter treatment catch basins is to reduce the level of contaminants in the runoff water, through filtration and sedimentation, though the plants in the wetpond will also reduce pollutants though bio-uptake. It is essential that the water quality pond have calm conditions be inspected regularly for accumulation of sediment. The pond should be visually inspected for sediment accumulation and blockages at least once each year and also after every major storm greater than or equal to a 10-year return frequency. The cartridge filter treatment catch basins should be maintained in accordance with the manufacturer's recommendations. CONVEYANCE SYSTEMS Pipes transport runoff from one place to another, in this case from catch basins to the pond, then to the downstream drainage system. To work properly, pipes must be kept free of silt and other debris. If pipes become blocked, surface flooding will usually occur. CATCH BASINS AND AREA DRAINS Catch basins collect surface drainage and direct it into storm conveyance pipes. They help prevent downstream drainage problems by trapping sediment and other debris that would otherwise flow downstream with the runoff. It is important to keep catch basins clean so accumulated silt is not flushed out during a significant storm. Also, if the outflow pipe becomes blocked with debris, surface flooding will usually occur. All catch basins should be inspected at least once each year and after major storms. Area drains convey runoff directly into conveyance pipes. To prevent surface flooding, their surface grates must be kept free of litter and debris. If dirt or other sediment gets into the pipes and they become blocked, the pipes will need to be cleaned, either manually or using a Vactor truck. The following tables identify maintenance issues, which should be addressed regularly, describing possible problems with the drainage system and their respective solutions. • APPENDIX E BOND QUANTITIES WORKSHEET (not included in this preliminary report) RETENTION/DETENTION FACILITY SUMMARY SHEET & SKETCH DECLARATION OF COVENANT (not included in this preliminary report) • KING cou; , WASHINGTON, SURFACE WATER I GN MANUAL STORMWATER FACILITY SUMMARY SHEET DDES Permit Number_,/J._,_._LJ,.;;1u:f'--'O.u..ZJ,..,--"t,L__ (provide one Stormwater Facility Summary Sheet per Natural Discharge Location) /JJ '/ PcJ CtJ l Overview: ProjectName Heu ve di?r 1£,-; ... r P/,;I (;099er J Jori P!cJ Downstream Drainage Basins Major Basin N'.""e /.Jik etuatluA-rtiJo lmmed1ate Basm Name ___,,..i)'-"'-"'"~'~_J_L--'..'"~"'-'f/c::_ ___ _ Flow Control: Flow Control Facility Name/Number _fli.._..o,.,n,......,h~d .. ,~l_,/,_J"-.LL~l-c_,,,.,o~oLnud""----- If none, Flow control provided in regional/shared facility (give location), ______________ _ No flow control required Exemption number------------- General Facility Information: Type/Number of detention facilities: _/_ponds Type/Number of infiltration facilities: ___ ponds vaults tanks tanks trenches Control Structure Location _ _,Al'---'Lt.,',{.,_) _ _,,c_,,Q"'-LY-L/\1.J(<..Lir_,,,oecl'-----,/?c:....:Oc.c':'.\.>..c:.cfL-_____________ _ Type of Control Structure ---"(:..,'g'"---.--'()=r,'-"h-'--"'lf'--,_/0~µ.=·"',,.---Number of Orifices/Restrictions _.c_;2 ___ _ Size of Orifice/Restriction: No. 1 _...:"Z=·l.,9 ___ _ No. 2 _..<c2"--'. ~'-'fl---- No. 3 ------- No. 4 ------- Flow Control Performance Standard level 1 Live Storage Volume _ _.,_5'_"'1:.;J'--"'&'--'Jl..4f--Depth Number of Acres Served 7. J '? NumberofLow__,~"'-9L.:...1...,f,__ __ _ {ad1~ s!mL.J J <I t/ Volume Factor of Safety ______ _ Dam Safety Regulations (Washington State Department of Ecology) Reservoir Volume above natural grade 12, 11'/ <:;: '! Depth of Reservoir above natural grade __ ' ~/_' __ _ Facility Summary Sheet Sketch ( ~Ad ,.:..5 -~ pllv>\.S) All detention, infiltration and water quality facilities must include a detailed sketch. (11 "x 17" reduced size plan sheeW may be used) 2005 Surface Water Design Manual I 1/1/05 KING COUNTY, W INGTON, SURFACE WATER DESIGN \!UAL Water Quality: Type/Number of water quality facilities/BMPs: biofiltration swale ___ sand filter (basic or large) (regular/wet/ or continuous inflow) ___ sand filter, linear (basic or large) _[ __ combined detention/wetpond ___ sand filter vault (basic or large) (wetpond portio~r large) sand bed depth ___ (inches) combined detention/wetvault ___ stormwater wetland ___ filter strip storm filter ___ flow dispersion ___ wetpond (basic or large) ___ farm management plan wetvault ___ landscape management plan ___ Is facility Lined? ___ oil/water separator If so, what marker is used above (baffle or coalescing plate) Liner? ________ _ _2__ catch basin inserts: Manufacturer 'Scto.,-M-u,.)cJ--e r 5 (D ___ pre-settling pond ___ pre-settling structure: Manufacturer __________________ _ ___ high flow bypass structure (e.g., !low-splitter catch basin) source controls------------------------- Design Information Water Quality design flow __ ..::Oce,,"0"-'5"--'CK"'--"------- Water Quality treated volume (sandfilter) ________ _ Water Quality storage volume (wetpool) _...,2"'-w"'-1-/-''l""-IJJ_..,,c_f'1-_ Facility Summary Sheet Sketch ( ~Ni..,~'j -5--u pl"-"'-s) All detention, infiltration and water quality facilities must include a detailed sketch. (I I "xi?" reduced size plan sheets may be used) 111/05 2 2005 Surface Water Design Manual -.. ® King County Road Services Division Department ofTransportation Traffic Engineering Section MS KSC-TR-0222 201 South Jackson Street Seattle, WA 98104 August 16, 2006 TO: Variance File FM: Craig Comfort, P.E., Road Variance Engineer, Traffic Engineering Section RE: Road Variance L06V0035-Fleuve des Voiles Plat-Related File L04P0002 Applicant's Presentation: 1. The Fleuve des Voiles Plat is a proposed 39-lot preliminary plat north of SE 192nd Street and west of 124th Avenue SE. The project will be improving the north leg of the intersection (124th Avenue SE) as access to the plat. There is only 30 feet of right-of-way (ROW) to construct 124th Avenue SE. A variance is requested for a proposed 12-foot centerline offset with respect to the south leg of the intersection. The King County Parks Division has refused to provide additional property rights to the east to properly align the intersection. 2. Relatively low traffic volumes will mitigate for potentially confusing traffic turning movements for the intersection with centerline offset. King County will be improving the intersection as part of a CIP (401004) project. The widening with a middle tum lane on SE 192nd Street will improve the north south left-tum movements. 3. A variance is requested for reduced radii cul-de-sac bulbs for three private access tracts (PA Ts). One of the tracts (Tract B) is in the Cogger Short Plat. The 18-foot radii are proposed for the cul-de-sac bulbs. All three tracts are less than the 150-foot maximum length for a PAT. The Cogger Short Plat is also being developed by the applicant and will connect to roads constructed by the Fleuve des Voiles Plat. Staffs Findings and Conclusions: I. Additional consultations with King County Parks determined that additional property rights will be provided so that the intersection can be properly aligned. Negotiations are ongoing between Parks and the applicant. 2. The proposed reduced radii for the bulbs on the three PA Ts are acceptable without variance consideration if none of the PATS are over 150 feet long. The King County Road Standards does not require bulbs on PA Ts. Cul-de-sac bulbs are not required unless a street extends more than 150 feet in length. The proposed reduced bulbs can be considered additional paving adjacent to the termini of the PATs. Charles Spaeth August 16, 2006 Page2 A copy of staffs analysis, findings, and conclusions is enclosed. If you have any questions, please call Craig Comfort, Road Variance Engineer, Traffic Engineering Section, at 206-263-6109. Sincerely, Paulette Norman, P.E. County Road Engineer PN:CC:kc cc: James Sanders, P.E., Development Engineer, Land Use Services Division (LUSD}, Department of Development and Environmental Services (DOES) Pete Dye P.E., Senior Engineer, LUSD, DOES Linda Dougherty, Division Director, Road Services Division (RSD), Department of Transportation (DOT) Matthew Nolan, P.E., County Traffic Engineer, Traffic Engineering Section, RSD, DOT Fatin Kara, P.E., Supervising Engineer, Traffic Engineering Section, RSD, DOT Kris Langley, Senior Engineer, Traffic Engineering Section, RSD, DOT Craig Comfort, P.E., Road Variance Engineer, Traffic Engineering Section, RSD, DOT ® King County Department of Development and Environmental Services Land Use Services Division Web date· 09/1312005 DROP-OFF COVER SHEET FOR LUSD ONLY 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296-6600 TIY 206-296-7217 For alternate formats, call 206-296-6600. Drop-Off Cover Sheet for Land Use Services Division ••••••••••••••••• IMPORTANT••••••••••••••••• PROJECT NUMBER AND NAME IS NECESSARY DATE RECEIVED BY LUSD FOR ALL DROP-OFFS Project No L04P0002 ~==~-------------- Project Name Fleuve des Voiles ~~(G~~~7~ij JUN 3 0 2006 1~ FROM Ravenna Development, Charles Spaeth, Applicant Company Name I Contact Person Telephone No ~2=0~6--5~2~6~-8~4~8~1 _________ _ TO Bruce Whittaker K.G. O.D.E.S. ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Short Plat / Plats Please specify nem(s) dropped-off: Cover letter (6/29/06) from Charles Spaeth; Parks & Recreation Division letter (6127 /06); Spaeth 6113/06 letter to Natural Resources & Pfarks; Langley & Comfort 6126/06 technical comments on intersection; Fleuve des Voiles Sheet P-2 revised 6/12/06 Lot Line Adjustment Permit Please specify item(s) dropped-off: t Right of Way Permit Please specify item(s) dropped-off: Clearing/ Grading Permit -Additional infom,ation requested. Please specify nem(s) dropped-off: Q!!!!r: PLEASE NOTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything. Assistance in finding a project number can be provided by speaking to a Zoning/Land Use Technician. Your cooperation is important. Thank you. Check out the DDES Web site at www.metrokc.gov/ddes KC Drol)-OffCoverSheet-lUSDOnlyFORM lg.,:vs-dropoff.pdf 09/1312005 Page 1 ol 1 From: Langley, Kristen [Kristen.Langley@METROKC.GOV] Sent: Monday, June 26, 2006 7:28 AM To: Comfort, Craig; cshaffercorp@att.net Cc: Tazuma, Thomas; Claussen, Kimberly; Dye, Pete; Kara, Fatin Subject: RE: Flueve Des Voiles Plat Variance L06V0035 To respond, the curb returns should be set based upon a measurement of 22-feet from centerline to curbline. on SE 192nd Street. The entire curb return should be constructed on both the northeast and northwest corners of the intersection. Since there is going to be an issue of timing of the County's GIP, it may make some sense (if the GIP is going to occur after the construction of the remainder of the plat improvements) for the Applicant to construct only a paved shoulder (in lieu of the curb returns and associated ADA ramps and sidewalks) and deposit the construction costs of those remaining improvements into the GIP account. It would appear to be inadvisable to (potentially) have the Applicant construct some improvements --only to have them removed for the installation of the signal poles, conduits, and other appurtenances --and then rebuilt. Tom: where are we with the timing of the GIP? Kris From: Comfort, Craig Sent: Monday, June 26, 2006 6:45 AM To: 'cshaffercorp@att.net' Cc: Langley, Kristen; Tazuma, Thomas; Claussen, Kimberly; Dye, Pete; Kara, Fatin Subject: Flueve Des Voiles Plat Variance L06V0035 Charles Spaeth: Thank you for the conceptual design showing the additional property to be provided at the northeast quadrant of the intersection of SE 192nd Street and 124th Avenue SE in order to align the road centerline. I understand you are working with KC Parks to effect the land transfer. The proposed area land area to be provided looks acceptable to me in order to build and align the north leg of the intersection. You should also consult with the ODES as ultimately they will be reviewing and approving your improvement plans. ODES might prefer a horizontal curve instead of the 5 degree angle point at the intersection. The proposed land transfer area has acceptable area for at least a 300 feet radius horizontal curve. Please note that the proposed 25 foot curb line radii should be a minimum 35 feet. Please consult with ODES as to the how far the curbs should be extended around onto SE 192nd Street and the exact location of the curb tenminii from the centerline of that arterial. I assume the proposed 24 foot road width with sidewalk on one side (north leg of 124th Avenue SE) is being approved by DOES under 1.03 of the KCRS. The existing 30 foot width of the offsite ROW limits the road width. Craig Comfort ' " June 29, 2006 Bruce Whittaker Charles Spaeth/ Ravenna Development 6839 Ravenna Ave. NE, Seattle, WA 98115 206-526-8481 I (fax) 206-526-5939 cshaffercorp@att.net DOES, Land Use Service Division 900 Oakesdale Ave. SW Renton, WA 98055-1219 Re: Fleuve des Voiles/ L04P0002 SE 19200 / I 24th Ave. SE Intersection Dear Bruce, Enclosed you will find the following regarding the above referenced intersection: • Fleuve des Voiles revised (6/12/06) Sheet P-2 showing intersection detail • C. Spaeth proposal letter to Dept. of Natural Resources and Parks, 6/13/06 • Robert Foxworthy of Dept. ofNatural Resources and Parks 6/27/06 response to C. Spaeth 6/13/06 proposal • Kristen Langley and Craig Comfort (Dept. of Transportation) 6/26/06 technical comments on C. Spaeth proposal (The reason Craig and Kristen were the first to see and comment on the proposal is because Craig contacted me when he received the road variance request submitted 3/31/06. Following that contact I exchanged letters and phone calls with Nick Halverson and Robert Foxworthy of Parks, which culminated in a meeting with them and the submission of my 6/13/06 letter. Since Robert's and Nick's offices are in the same building as Craig and Kristen I suggested they show them Sheet P-2. Craig and Kristen responded with their 6/26/06 technical comments.) At my meeting with Robert Foxworthy and Nick Halverson I proposed that Parks transfer or grant rights to use a 455 sq. ft. "triangle"as shown on Sheet P-2, in return for my transferring or granting rights to use "Tract A" to Parks. They were both supportive of the proposal and indicated others in their department with whom they had consulted were as well. I requested written documentation evidencing Park's willingness to work with the Dept. of Transportation and me to create the best possible intersection design. The purpose of Robert's June 27th letter is simply to indicate the Park Department's intention to cooperate. Robert realizes that the legal and technical mechanics of getting everything worked out will require much more refinement. Page 1 of2 • You will also note that Parks is agreeable to discussing drainage issues. Craig Comfort indicated that-assuming the intersection design shown on Sheet P-2 is acceptable to you------it would appear there is no longer any necessity for a Road Standard Variance (submitted 3/31/06) for intersection spacing nor for the cul-de-sac radiuses (which are not non-public and shorter than 150 feet in length) Please let me know ifl am in error on these points, or if there is any additional information that you may require. If a variance is no longer required, what is the process to terminate it? Please contact me at 206-526-8481 if you have any questions. cc. Chad Tibbits Nick Gillen Larry West De-En Lang Robert Foxworthy Nick Halverson Page2 of2 Sincerely, Ravenna Development ~~r~rc_ Charles Spaeth Parks and Recreation Division Department of Natural Resources and Parks King Street Center Bulld1ng KSC·NR-0700 201 South Jackson Street Seattle, WA 98104-3855 206-296-8687 June 27, 2006 Mr. Charles Spaeth Ravenna Development LLC 6839 Ravenna Avenue NE Seattle, WA 98115 Subject: Intersection SE 192"d Street/124th Ave. SE, Dept. ofNatural Resources and Parks' Soos Creek Property. Fleuve des Voiles Preliminary Plat Dear Mr. Spaeth: The King County Parks and Recreation Division appreciates having the opportunity to meet with you this afternoon to discuss your proposed preliminary plat. We understand that the Parks and Recreation Division possess an important piece of property that the development will require in order to meet the King County road standards As we noted in the meeting, the Parks and Recreation Division is interested in working cooperatively with you toward finding solutions to the real estate and technical issues necessary to ensure that your project meets the County's road and intersection standards. To this end, we look forward to identifying and facilitating an appropriate Parks and Recreation Division/developer land exchange strategy as well as, to identify the most appropriate technical strategies to meet identified drainage and other issues that may affect future Parks and Recreation facilities. Sincerely, Robert Foxworthy, AI.Cl''--- Regional Trails Coordinator cc: Tom Teigen, Business Plan Implementation Section Manager, Parks and Recreation Division, Department of Natural Resources and Parks (DNRP) Nick Halverson, Property Agent, Parks and Recreation Division, DNRP Craig Comfort, Senior Engineer, King County Road Services Division Kristen Langley, Traffic Impact Review Engineer III, King County Road Services Division 1 ,. June 13, 2006 Charles Spaeth / Ravenna Development LLC 6839 Ravenna Ave. NE, Seattle, WA 98115 206-526-8481 I (fax) 206-526-5939 Nick Halverson and Robert Nunnenkamp KC Dept. of Natural Resources and Parks 201 S. Jackson St. KSC-NR-0700 Seattle, WA 98104-3856 Re: Intersection -SE 192nd St / 1241& Ave. SE; Dept. of Natural Resources and Parks' Soos Creek property; Fleuve des Voiles Preliminary Plat Dear Mr. Halverson and Mr. Nunnenkamp, I am the developer of the proposed 39-lot Fleuve des Voiles plat (Fleuve) plus the contiguous S- lot Cogger short plat, which are currently under review by DOES for preliminary plat approval (L04P0002 and LOSS0040). The proposed access to the Fleuve/Cogger project is via the north leg of the SE 192nd /!24th Ave. SE intersection. I am proposing a land trade (or a trade of easements) between the Fleuve plat and the Parks Department that I believe will benefit both Parks and the Dept. of Transportation. To review-the Fleuve project currently has thirty-feet of dedicated access on the west half of what would be the north leg of 124th Ave. NE. Under normal circumstances the landowner on the east half of the road would also dedicate thirty feet to complete a sixty-foot right of way. (The south leg of 124th Ave. has a sixty-foot right of way.) The Parks Department ownership of the easterly thirty feet, however, makes for an unusual situation Enclosed, you will find my engineer's drawing showing the alignment I propose for the SE 192nd & 124th Ave. SE intersection. You will note that the SE 192nd St. right of way extends fur enough north to allow the southerly portion of the north leg of !24th Ave. to align with its south leg. North of the SE 192nd St. right of way and east of the 124th Ave. centerline, however, the land belongs to Parks. Absent access to a small portion of Park property (as delineated in #1, below) the Dept of Transportation will be unable to design an intersection that meets required safety standards. "Tract A" shown on the drawing (21,937 sq. ft. of wetland buffer immediately north of the 90- degree curve) is where the developer is required to enhance 6,558 sq. ft. by removing non-native species and planting native species. The balance of Tract A, approximately 15,379 sq. ft., is available to use for additional enhancement to mitigate other impacts to wetland or buffer in the immediate area. No utilities run either under or over Tract A except for a proposed storm water overflow outlet into a Gabion cage. I hereby formally propose to the Dept. of Natural Resources and Parks that all 21,937 sq. ft. of Tract A be dedicated to Parks in return for Parks agreeing to do the following: 1. Dedicate, grant an easement to, or otherwise cede control to King County Dept. of Transportation of approximately 455 Square feet (delineated as shaded area on intersection detail as shown on P-2, Fleuve des Voiles preliminary plat, attached). Transfer of this area to Dept. of Transportation's control will enable the north leg of 124 1h Ave. SE to safely align with its south leg; and it will allow for a thirty-foot right of way of the north leg as 124th Ave. SE is brought west of the center line (and the prope~ line) as it proceeds north at a ninety-five degree angle relative to the east leg of SE 192• St. 2. Grant a drainage easement allowing runoff from the north leg of 124th Ave. SE to sheet flow to the east as it historically has. Pending a determination of the precise legal method by which this exchange ofland and/or the rights thereto, and the granting of a drainage easement, would be accomplished, I request the timely issuance of a memorandum from the Parks Department indicating the Parks Department's interest in pursuing the proposal offered above. Thank-you for your consideration. Sincerely, Ravenna Development LLC Charles Spaeth, Manager Encl. Fleuve des Voiles preliminary plat, Sheet P-6, Revised 6/12/06 cc. Chad Tibbits, DDES Bruce Whittaker, DOES Nick Gillen, DOES Larry West, DOES Kristen Langley, Dept of Transportation Craig Comfort, Dept. of Transportation f -.. L04P0002 Bruce Whittaker DDESILUSD MS DAK-DE-0100 OFFICE OF THE HEARING EXAMINER KING COUNTY, WASHINGTON 400 Yesler Way, Room 404 Seattle, Washington 98104 Telephone (206) 296-4660 Facsimile (206) 296-1654 Email: hearex@metrokc.gov January 12, 2007 REPORT AND DECISION SUBJECT: Depar1ment of Development and Environmental Services File No. L04P0002 Proposed Ordinance No. 2006-0565 FLEUVE DES VOILES Preliminary Plat Application Location: On the north side of SE 192nd Street, west of 124th Avenue Northeast, approximately 19100 -124th Avenue Southeast, Renton Applicant: Charles Spaeth represented by De-En Lang Lang Associates, Inc. I 0658 Riviera Place Northeast Seattle, Washington 98125 Telephone: (206) 306-8880 Facsimile: (206) 362-6848 King County: Department of Development and Environmental Services (DDES) represented by Chad Tibbits 900 Oakesdale A venue Southwest Renton, Washington 98055 Telephone: (206) 296-7194 Facsimile: (206) 296-7051 SUMMARY OF RECOMMENDATIONS/DECISION: Department's Preliminary Recommendation: Department's Final Recommendation: Examiner's Decision: EXAMINER PROCEEDINGS: Hearing opened: Hearing continued administratively: Hearing closed: Approve, with conditions Approve, with revised conditions Approve, with further revised conditions December 12, 2006 December 12, 2006 December 13, 2006 L04P0002 -Fleuve des Voiles Page 2 of 14 Participants at the public hearing and the exhibits offered and entered are listed in the attached minutes. A verbatim recording of the hearing is available in the office of the King County Hearing Examiner. FINDINGS, CONCLUSIONS & DECISION: Having reviewed the record in this matter, the Examiner now makes and enters the following: FINDINGS: 1. General Information: Applicant: Engineer: STR: Location: Zoning: Acreage: Number of Lots: Density: Lot Size: Proposed Use: Sewage Disposal: Water Supply: Fire District: School District: Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 206-526-8481 Taylor Engineering Consultants 205 Front Street S. Issaquah, WA 98027 425-391-1415 SW33-23-05 The site is located on the north side of SE 19200 St., west of 124th Avenue NE. R-6 7.07 acres 39 Approximately 5 .51 units per acre Approximately 4,000 to 7,200 square feet in size Single Family Detached Dwellings Soos Creek Water and Sewer District Soos Creek Water and Sewer District King County Fire District No. 40 Renton School District No. 403 Application completeness date: October I , 2004 Associated Applications: Drainage Adjustment L05V0040 2. Except as modified herein, the facts set forth in the DDES reports to the Examiner and the DDES and King County Department of Transportation (KCDOJ) testimony are found to be correct and are incorporated herein by reference. 3. The subject property is a 7 .07-acre, irregularly-shaped parcel located north of Southeast 192nd Street at the present northerly stub terminus of I 24th Avenue Southeast, just west of Soos Creek in the unincorporated Renton area. The terrain of the site consists of two benches connected by a short fairly steep slope downward to the east. The benches are relatively flat to gentle in grade; •' .... ' . ' L04P0002 -Flcuve des Voiles Page 3 of 14 the general grade of the site is from west to east down toward Soos Creek. The property is vegetated with a moderately dense wood of successive-growth mixed-species native overstory with typical Northwest understory and ground cover. The properties are located within the Upper Soos sub-basin of the Soos Creek basin. A Class I wetland, a defined sensitive area under the applicable version of Chapter 2 lA.24 KCC, is located just offsite of the northeast portions of the property bordering Soos Creek. A single-family residence and outbuildings are located on the property (and will be removed upon development). The surrounding area is generally residentially developed at lower large-lot suburban densities, and a school to the east, but is undergoing infill to higher-density suburban development within the urban growth area. 4. Applicant Charles Spaeth proposes subdivision of the property into 39 lots for detached single- family dwellings, as well as separate tracts for drainage facilities, open space and recreation. The density would be approximately 5.5 dwelling units per acre, with lot sizes ranging from approximately 4,000 to 7,200 square feet in area. 5. The Applicant is simultaneously developing the adjacent proposed Cogger short subdivision (file L05S0040), an eight-lot, .93-acre short subdivision proposed for the property directly abutting to the south between the site and Southeast 192nd Street. Concurrent development will allow for the Cogger property to be developed without a separate access onto Southeast 192nd Street, an arterial road; it will use access via the subject subdivision. 6. Vehicular access to the proposed development and the Cogger short subdivision will be provided by improvement of the existing 124th Avenue Southeast right-of-way, which runs due north from Southeast 192nd Street to join the property on the south boundary of the northeasterly-most projection. From there, the road would curve northwest and then due west to form a looped road network that would have two cul-de-sacs branching from it to serve some of the development's own lots and a third to extend south from the southernmost portion of the loop to provide access to the Cogger short subdivision lots. A stub road would also branch from the internal loop northerly to connect with I 22nd A venue Southeast within the proposed Wehrman subdivision to the north (L04P0027, which has recently been granted preliminary plat approval). The Wehrman subdivision provides a through route north up to Southeast 188th Street, which would provide connection westerly to I 20th Avenue Southeast. 7. Common recreation facilities are to be developed within Tract C of the subject property and Tract A within the Cogger short subdivision, to be shared by the residents of both developments.' Although this arrangement does not meet the absolute letter of the code provisions in KCC 2 IA.14.180, which require location onsite and centrality within each specific development, it will be permitted in this case2 given a) the direct adjacency of the properties; b) simultaneous development; c) unified control over both developments; and d) their both proposed to be governed by a single homeowners' association. ht addition, and as importantly, the fact that the tracts are in separate developments is not a practical or safety concern in the instant case, since the road crossing to gain access to them would be no more than would be 1 Part of the reason for the property configuration which results in the Coggerrecreation Tract A (even though it is on the side of the street of1he bulk of the subject development~ whereas all of the Cogger lots are on the south side of Southeast 191st Street) is that some boundary line adjustments (BLA) have been performed or are proposed in order to optimize the Jot layout for the subject development. 2 As it has been in a very few past cases of similar circumstances. L04P0002 -Fleuve des Voiles Page 4 of 14 typically provided in a single larger development with an internal road system_ The road crossings to gain access to the intended recreation facilities are over subaccess, low-volume roads and the proposal provides the requisite safe convenience and accessibility which lay at the heart of the subdivision recreation facility requirements. 8. The development's resident public schoolchildren will be bused to their respective middle and high schools, and students at the elementary level will walk to their designated elementary school, which at present is located to the northwest on 120th Avenue Southeast, with the most direct walking route via the aforementioned preliminarily approved but yet-to-be-developed Wehrman subdivision abutting to the north_ Conditions of preliminary plat approval must accordingly be imposed to assure that safe walking conditions are provided for public school children residing in the development with some contingency if the Wehnnan development is not completed prior to final plat approval of the subject development. The Wehnnan development was made subject to conditions requiring that appropriate provisions be assured for safe walking conditions for school pedestrians, and in effect, the subject development is dependent upon those improvements, or an effective alternative, for such assurance. 9. The traffic impacts of the proposed development will be mitigated under the requirements of County code with respect to Chapter 14.70 KCC (Transportation Concurrency Management) and Chapter )4_75 KCC (Mitigation Payment System). In order to comply with Chapter 14.80 KCC regarding intersection standards, the Mitigated Determination of Non-Significance (MONS) has imposed a mitigation measure requiring the installation ofa traffic signal at the project's 124th Avenue Southeast entry onto Southeast 192nd Street IO. The development's surface water drainage will be collected and conveyed to stormwater drainage facilities in proposed Tract B, which will lie upslope of the wetland buffer contained with Tract A. The property is subject to the 1998 King County Stormwater Water Design Manual (KCSWDM) and must meet the standards for Level 1 detention and Basic water quality standards (the Cogger short plat is subject to the more recent 2005 KCSWDM standards, but the interrelationship of the two standards is accomplishable with the proposed stormwater design program)_ A drainage adjustment (L06V0040) has been approved for the two developments to allow the use of a shared stormwater facility. 11. Neighboring residents submit comments expressing concern about the density and character of the development as being out of scale with the existing development in the area and a reduction in the existing residents' quality oflife. The density of development is fully permissible under the existing R-6 zoning, which has been in place for a number of years in implementation of the state Growth Management Act and the County's implementing Comprehensive Plan and zoning. The Examiner has no authority to disallow the proposed density of development, which the Examiner notes is approximately half a unit per acre less than the maximum achievable under the base density of the applied R-6 zone. Other concerns expressed have to do with drainage and potential flooding, which will be fully addressed for regulatory compliance by conformity of the development with the applicable stormwater detention and water quality maintenance standards. Lastly, concern is expressed regarding some debris such as used tires on the property and the need for cleanup. That will presumably be accomplished during plat preparation and construction, since materials such as those are disallowed in construction fill and grading for development. • .. . A •, L04P0002 -Fleuve des Voiles Page 5 of 14 12. The Fire District No. 40 Fire Marshal expresses concern regarding the road widths of the proposed development and the need for fire equipment access. The King County Fire Marshal has recently instituted a more assertive program of fire suppression rules applied to development, wherein if road widths are provided as narrow as the 1993 King County Road Standards (KCRS) permit, then individual structures may be subject to individual fire sprinklering requirements at the residential building permit stage. The matter is therefore left to post-preliminary plat consideration by the Applicant in deliberating the relative viability of those alternatives, and any accommodations which may ensue from discussions with the appropriate fire officials. 13. Chapter 21A.38 KCC's special overlay requirement S0-220 (Significant Tree Overlay) applies to the property. The Significant Tree Overlay standards require the development to retain a percentage of the significant trees onsite. To implement KCC 21A.38.230, a detailed tree retention plan must be submitted with the engineering plans for the subdivision. CONCLUSIONS: I. The proposed subdivision, as conditioned below, would conform to applicable land use controls. In particular, the proposed type of development and overall density are specifically permitted under the R-6 zone. 2. If approved subject to the conditions below, the proposed subdivision will make appropriate provisions for the topical items enumerated within RCW 58.17.1 JO, and will serve the public health, safety and welfare, and the public use and interest. 3. The conditions for final plat approval set forth below are reasonable requirements and in the public interest. 4. The dedications of land or easements within and adjacent to the proposed plat, as shown on the revised preliminary plat submitted on June 30, 2006, or as required for final plat approval, are reasonable and necessary as a direct result of the development of this proposed plat, and are proportionate to the impacts of the development. DEOSION: The preliminary plat of the Fleuve des Voiles subdivision, as revised and received June 30, 2006, is approved subject to the following conditions of approval: I. Compliance with all platting provisions of Title 19A of the King County Code. 2. All persons having an ownership interest in the subject property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. 3. The plat shall comply with the base density and minimum density requirements of the R-6 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environment Services. L04P0002 -Fleuve des Voiles Page 6 ofl4 Any/all plat boundary discrepancy shall be resolved to the satisfaction ofDDES prior to the submittal of the final plat documents. As used in this condition, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. · 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187, as amended (1993 KCRS). 5. The applicant shall obtain documentation by the King County Fire Protection Engineer certifying compliance with the fire flow standards of Chapter 17 .08 of the King County Code. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location oflots as shown on the approved preliminary plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in K.C.C. 9.04 and the King County Surface Water Design Manual (KCSWDM) must also be satisfied during engineering and final review. a. Drainage plans and analysis shall comply with the 1998 KCSWDM and applicable updates adopted by King County and must meet the standards for Level I detention and Basic water quality standards. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes, as established by DDES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts, footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings # on file with DDES and/or the King County Department of Transportation. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply with plans on file." d. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. e. A drainage conveyance pipe is required to allow for offsite stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSWDM at engineering plan submittal. f. The JOO-year floodplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. .. .... ,, L04P0002 -Fleuve des Voiles Page 7 of14 g. A drainage adjustment (L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 7. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: a. 1241h Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. b. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated for the obtaimnent of additional R/W at the northeast comer of the proposed SE 192nd St/1241h Ave SE intersection, required to construct the 1241h Ave SE improvements. The necessary R/W, which is shown on a Proposed Land Transfer Diagram received June 30, 2006, shall be acquired prior to engineering plan approval. c. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. d. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 8. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. 9. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The applicant has the option to either: (I) pay the MPS fee at the final plat recording, or (2) pay the MPS fee at the time of building permit issuance. If the first option is chosen, the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of building permit application. 10. Off-site access to the subdivision shall be over a full-width improved road which has been accepted by King County for maintenance. If a proposed access road meeting those standards has not been accepted by King County at the time of recording, then said road shall be fully bonded by the applicant of this subdivision. 11. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in the applicable version of Chapter 21 A.24 KCC (the pre-2005 version). Permanent survey markings and signs as specified in K.C.C. 21A.24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers ( e.g., with bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. L04 P0002 -Fleuve des Voiles Page 8 ofl4 12. Preliminary plat review has identified the following specific requirements which apply to this project. All other applicable requirements from K.C.C. 21A.24 shall also be addressed by the applicant. Wetlands Class 1 wetland(s) shall have a minimum buffer of 100 feet, measured from the wetland edge. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A 15-foot building set back line (BSBL) is required from the edge of all Sensitive Area Tracts and shall be shown on all affected lots. Signage shall be installed along the Sensitive Area Tract boundaries for long term protection and to clearly mark the extent of the tract. Sensitive area tract boundaries shall be clearly marked with bright orange construction and silt fencing prior to construction or site clearing activities. The boundaries shall remain marked until construction is complete. Road crossings of wetlands and/or buffers maybe allowed per KC 21A.24.330. Construction techniques such as retaining walls maybe required to limit impacts. Allowed impacts shall require mitigation. A final mitigation plan shall be required during engineering review. Off site utility construction within wetlands, aquatic areas, or buffers may require additional permits. This will be reviewed and determined during engineering review. Wetland hydrology may not be altered either during or after development. A hydrology analysis may be required during engineering review to show how wetland hydrology will be maintained after the site is developed. The engineering plans shall be routed to Critical Areas Staff for review of compliance to the above conditions. Alterations to Streams or Wetlands If alterations of streams and/or wetlands are approved in conformance with K.C.C. 21A.24, then a detailed plan to mitigate for impacts from that alteration will be required to be reviewed and approved along with the plat engineering plans. A performance bond or other fmancial guarantee will be required at the time of plan approval to guarantee that the mitigation measures are installed according to the plan. Once the mitigation work is completed to a DDES Senior Ecologist's satisfaction, the performance bond may be replaced by a maintenance bond for the remainder of the five-year monitoring period to guarantee the success of the mitigation. The applicant shall be responsible for the installation, maintenance and monitoring of any approved mitigation. The mitigation plan must be installed prior to final inspection of the plat. ,, ' L04 P0002 -Fleuve des Voiles Geotechnical Page 9 of 14 Clearing is not permitted on this site between October I and April I unless it is in compliance with King County Code 21A.220 (erosion hazard areas). If clearing is proposed during the October I through April I time period the applicant must delineate all on-site erosion hazard areas on the final engineering plans ( erosion hazard areas are defined in K.C.C. 2 IA.06.415). The delineation of such areas shall be approved by a DOES geologist, and the requirements found in K.C.C. 21A.24.220 concerning erosion hazard areas shall be met. The applicant's geotechnical engineer shall provide recommendations for the design and construction of the road, onsite grading and compaction, subsurface drainage, and all required retaining walls. The geotechnical recommendations shall be included in the T.I.R. and incorporated into the design with submittal of the engineering plans. The report must specifically address any setback requirements for future structures from any proposed retaining walls, and any setback requirements must be shown on the final engineering plans. Any required easements for maintenance of walls or subsurface drainage must also be provided on the final plans. Special geotechnical construction inspection of the road improvements, onsite grading and compaction, subsurface drainage, and any required retaining walls is required. Special construction inspection of the above construction elements is required to ensure compliance with the geotechnical report recommendations and to address unanticipated soil and groundwater conditions. Daily inspection reports shall be submitted to the assigned King County Land Use Inspector during the Construction phases of those improvements. A final construction report shall be submitted verifying compliance with the geotechnical recommendations and providing foundation design parameters for future residential construction. Notes requiring the above shall be shown on the engineering plans. Geotechnical special inspection of bearing soils for future home foundations is required. Notes to this effect shall be shown on the engineering plans and the final plat. 13. The following note shall be shown on the final engineering plan and recorded plat: RES1RICTIONS FOR SENSITIVE AREA TRACTS AND SENSITIVE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including control of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tract/sensitive area and buffer. The vegetation within the tract/sensitive area and buffer may not be cut, pruned, covered by fill, removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency, unless otherwise provided by law. L04P0002 -Fleuve des Voiles Page 10 of 14 The common boundary between the tract/sensitive area and buffer and the area of development activity must be marked or otherwise flagged to the satisfaction of King County prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tract/sensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot building setback line, unless otherwise provided by law. 14. Suitable recreation space shall be provided consistent with the requirements of K.C.C. 2 IA.14.180 and K.C.C. 2 IA. 14.190 (i.e., sport court[ s J, children's play equipment, picnic table[sJ, benches, etc.). a. A detailed recreation space plan (i.e., location, area calculations, dimensions, landscape specs, equipment specs, etc.) shall be submitted for review and approval by DDES and King County Parks prior to or concurrent with the submittal of engineering plans. b. A performance bond for recreation space improvements shall be posted prior to recording of the plat. c. The development's recreation space may be provided commonly with the adjacent Cogger short subdivision (L05S0040) as proposed and as discussed above, provided that the applicant demonstrates that a single homeowners association (see Condition 15 below) will be established for both developments and covenants provide for mutual and common use permission. In the event that the Cogger short subdivision is not platted in near concurrency and/or the lots in the subject development are not established in a homeowners association common with those of the Cogger short subdivision prior to or at the time of final plat approval, the subject subdivision shall provide onsite recreation facilities in full conformity with KCC 21A.14.l 80. 15. A homeowners' association or other workable organization shall be established to the satisfaction of DDES which provides for the ownership and continued maintenance of the recreation space and sensitive area tract(s). 16. Street trees shall be provided as follows (per KCRS 5.03 and K.C.C. ZIA.16.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards, unless King County Department of Transportation determines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way, they shall be located no more than 20 feet from the street right-of-way line. • L04 P0002 -Fleuve des Voiles Page II ofl4 d. The trees shall be owned and maintained by the abutting Jot owners or the homeowners association or other workable organization unless the county has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. e. The species of trees shall be approved by DDES iflocated within the right-of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers, or that is not compatible with overhead utility lines. f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approval. g. The applicant shall contact Metro Service Planning at (206) 684-1622 to determine if 124"' Avenue SE is on a bus route. If 124"' Avenue SE is a bus route, the street tree plan shall also be reviewed by Metro. h. The street trees must be installed and inspected, or a performance bond posted prior to recording of the plat. If a performance bond is posted, the street trees must be installed and inspected within one year of recording of the plat. At the time of inspection, if the trees are found to be installed per the approved plan, a maintenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after DDES has completed a second inspection and determined that the trees have been kept healthy and thriving. 17. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is subject to change based on the current county fees. 18. The following have been established by the MDNS under SEPA authority as necessary requirements to mitigate the adverse environmental impacts of this development. The applicant/developer shall demonstrate compliance with these items prior to final plat approval. A calculated deficient level-of-service (KCC 14.80.030A) will exist at the horizon year of the development, as calculated by the Applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192"" Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and jointly with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192"" Street/124"' Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006. This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of L04P0002 -Fleuve des Voiles Page 12 of 14 Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left turn), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. If funding is restored by future CIP budgets, AND a portion of the funding soW"Ce is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. 19. To implement former K.C.C. 21A.38.230 which applies to the site, a detailed tree retention plan shall be submitted with the engineering plans for the subject plat. The tree retention plan (and engineering plans) shall be consistent with the requirements of former K.C.C. 21A.38.230. No clearing of the subject property is permitted until the final tree retention plan is approved by LUSD. Flagging and temporary fencing of trees to be retained shall be provided, consistent with former K.C.C. 21A.38.230.B.4. The placement of impervious surfaces, fill material, excavation work, or the storage of construction materials is prohibited within the fenced areas around preserved trees, except for grading work permitted pursuant to former K.C.C. 21A.38.230.B.4.d.(2). 20. A note shall be placed on the final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of the proposed lots, consistent with K.C.C. 21A.38.230.B.6. 21. If the adjacent Wehrman subdivision development (L04P0027) is not completed prior to final plat approval of the subject development, certification shall be provided by the King County Department of Transportation that safe walking conditions are provided for public elementary schoolchildren residing in the subject development, along a reasonably direct and lawful route to their elementary school or, in the alternative, that they are provided with school bus service to the school and safe walking conditions are provided to the pertinent school bus stop. ORDERED January 12, 2007. ~---------...... Peter T. Donahue King County Hearing Examiner TRANSMITTED January 12, 2007, to the following parties and interested persons of record: Barghausen Cons. Eng. Attn: Ivana Halvorson. 18215 -72nd Ave. S. Kent WA 98032 Dennis Brevik 19103 -121st Pl. SE Renton WA 98058 Rebecca Brown 6839 Ravenna Ave. NE Seattle WA 98115 ' " .... J L04P0002 -Fleuve des Voiles Ben & Geri Bush 19124-121stPI.SE Renton WA 98058 Steve Halladin 19118-121st Pl. SE Renton WA 98058 Jacques Consulting Attn: Neal Jacques 2633 SW 163rd Pl. Burien WA 98166 Muckleshoot Cult. Res. Attn: L. Murphy & T. James 39015 -172nd St. SE Auburn WA 98092 Mark Stevens 19225 -!24th Ave. SE Renton WA 98058 Tim Wheeler 12131 SE 188thSt. Renton WA 98058 Lisa Dinsmore DDES/LUSD MS OAK-DE-0100 Kristen Langley DDES/LUSD MS OAK-DE-0100 Larry West DDES/LUSD MS OAK-DE-0100 Cogger 609 Grant Ave. S. Renton WA 98055 Harold Hodge 19210-121st Pl SE Renton WA 98058 De-En Lang Lang Assoc., Inc. 10658 Riviera Pl. NE Seattle WA 98125 Seattle KC Health Dept. E. Dist. Environ. Health 14350 SE Eastgate Way Bellevue WA 98007 Sean & Linda Warren 19125 -121st Pl. SE Renton WA 98058 Mark & Joyce Wilson 19205 -124th Ave. SE Renton WA 98058 Nick Gillen DDES/LUSD MS OAK-DE-0100 Chad Tibbits DDES-LUSD MS OAK-DE-0100 Kelly Whiting KC DOT, Rd. Srvcs. Div. MS KSC-TR-0231 NOTICE OF RIGHT TO APPEAL Page 13 of14 Shawn Ervin !8848-!20thAve. SE Renton WA 98058 Troy Humphrey 3!0-29th St. NE Puyallup WA 98372 Lozier Homes, Corp. Attn: Jennifer McCall 1203 -I 14th Ave. SE Bellevue WA 98004 Charles Spaeth Ravenna Devel., LLC 6839 Ravenna Ave. NE Seattle WA 98115 Marvin Wehrman 5115 -33rd Ave. W. Everett WA 98203 Kim Claussen DDES/LUSD MS OAK-DE-0100 Shirley Goll DDES/LUSD MS OAK-DE-0100 Steve Townsend DDES/LUSD MS OAK-DE-0100 Bruce Whittaker DDES/LUSD MS OAK-DE-0100 In order to appeal the decision of the Examiner, written notice of appeal must be filed with the Clerk of the King County Council with a fee of $250.00 (check payable to King County Office of Finance) on or before January 26, 2007. If a notice of appeal is filed, the original and six (6) copies of a written appeal statement specifying the basis for the appeal and argument in support of the appeal must be filed with the Clerk of the King County Council on or before February 2, 2007. Appeal statements may refer only to facts contained in the hearing record; new facts may not be presented on appeal. Filing requires actual delivery to the Office of the Clerk of the Council, Room 1025, King County Courthouse, 516 3"' Avenue, Seattle, Washington 98104, prior to the close of business (4:30 p.m.) on the date due. Prior mailing is not sufficient if actual receipt by the Clerk does not occur within the L04P0002 -Fleuve des Voiles Page 14 of 14 applicable time period. The Examiner does not have authority to extend the time period unless the Office of the Clerk is not open on the specified closing date, in which event delivery prior to the close of business on the next business day is sufficient to meet the filing requirement. Ifa written notice of appeal and filing fee are not filed within fourteen {14) calendar days of the date of this report, or if a written appeal statement and argument are not filed within twenty-one (21) calendar days of the date of this report, the decision of the hearing examiner contained herein shall be the final decision of King County without the need for further action by the Council. MINUTES OF THE DECEMBER 12, 2006, PUBLIC HEARING ON DEP ARlMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES FILE NO. L04P0002. Peter T. Donahue was the Hearing Examiner in this matter. Participating in the hearing were Chad Tibbits, Bruce Whittaker and Kristen Langley representing the Department; and De-En Lang representing the Applicant. The following Exhibits were offered and entered into the record: Exhibit No. I Exhibit No. 2 Exhibit No. 3 Exhibit No. 4 Exhibit No. 5 Exhibit No. 6 Exhibit No. 7 Exhibit No. 8 Exhibit No. 9 Exhibit No. 10 Exhibit No. 11 Exhibit No. 12 Exhibit No. 13 Exhibit No. 14 Department of Development and Environmental Services file no. L04P0002 Department of Development and Environmental Services Preliminary Report, dated December 12, 2006 Application for Land Use Permits received February 4, 2004 SEPA Environmental checklist received February 4, 2004 SEPA Determination of Non-significance issued November 9, 2006 Affidavit of Posting indicating a posting date of March 8, 2005; received by DDES on March 9, 2005 Preliminary plat map received June 30, 2006 (Revised) Revised Level I Downstream Analysis prepared by Taylor Engineering Consultants, received March 31, 2006 Certificate of Water Availability from the Soos Creek Water and Sewer District dated June 17, 2005 Certificate of Sewer Availability from Soos Creek Water and Sewer District, dated June 17, 2005 Conceptual Recreation Plan received March 31, 2006 Revised Conceptual Grading and Drainage Plan received March 31, 2006 Letter from Ben and Geri Bush faxed December 4, 2006 Letter from Sandy Haydock, Fire District 40, dated December 12, 2006 The following exhibit was entered into the record on December 13, 2006: Exhibit No. 15 December 14, 2006 (received by e-mail December 13) DDES memorandum regarding landscaping inspection fees PTD:ms L04P0002 RPT l :-, l=\1.>~~ ~ Vo,~ '-04 P'OOO "2-- \--~ e a-.-,:. . \ ....._ .5 4. Drainage: The Flueve Des Voiles subdivision is located in the Upper Soos subbasin of the Soos Creek basin. The Fleuves des Voiles site is subject to the Level One flow control and Basic water quality requirements of the 1998 KCSWDM. An adjoining proposed short plat (Cogger short plat L05S0040) is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. The proposed Cogger short plat is adjacent to the F!euves des Voiles subdivision, along the south edge. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040 The combined, irregularly-shaped sites slope moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192nd Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. A drainage adjustment (L06V0040) is approved for the Flueves des Voiles and the Cogger short plat sites. The adjustment allows the use of a shared stormwater facility for both sites. The mixing of the two stormwater detention requirements (Level 1 and Conservation) can be accomplished with the KCRTS Stormwater design program. -\'1't6 Swt:>}-1 -Lev~\ \ F.C.:- ' • -<e.>C~e>T-t':.5 'S\-'te. =~~ ~ c,,..,._, tit•=~~ ....\c. eo:e-+ J r-c.., ;...a....o-"-' ~ ~ ...:,~~ a..~~",/ e..~ ( t....e ~ VC'C:'1.o / '-(f) \~ \ 2.4, ~ .6(..)..Q_ ~ E:... ( ""~ 4-~ ~ ) \~~+ @.. ~c'ct~/12.A> CQ,..~ M'O"-.)S ? oo-4~~ ~.:::,,-· o~ ~OT°~~ . ' B~ \::o.. +o ~ ... ·-• , ~~ ~"'Ge~= A-~ . -I \ = ~ . Sh<lre_ _i te c.. . .5 ~"' e_. L. v.:; / C ~0 ev . re.__c_ -5. f~ ~ ~\.'"") c..ec:k_. C...Q.....l.f"'-~ ~ '--U... ~ 1 c:..o~ev- \ v-.~ ~ d-eu~\c.i~ ~ ... ......._l~~s v...:, l C.... o.:i~e.>-J 5~. _j "'c. clo~ ~ #L. King County DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES LAND USE SERVICES DIVISION KING COUNTY, WASHINGTON PRELIMINARY REPORT TO THE HEARING EXAMINER December 12, 2006-PUBLIC HEARING AT 1:30 P.M. DDES Hearing Room 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 Phone: (206) 296-6600 PROPOSED PLAT OF FLEUVE DES VOILES FILE NO: L04P0002 PROPOSED ORDINANCE NO: 2006-0565 A. SUMMARY OF PROPOSED ACTION: B. This is a request for a subdivision of7.07 acres into 39 lots for detached single-family dwellings. The proposed density is 5.51 dwelling units per acre. The lot sizes range from approximately 4,000 to 7,200 square feet. See Attachment 1 for a copy of the proposed revised plat map. GENERAL INFORMATION: Applicant: Engineer: STR: Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 206-526-8481 Taylor Engineering Consultants 205 Front Street S. Issaquah, WA 98027 425-391-1415 SW-33-23-05 Location: The site is located on the north side of SE 192nd St., west of 124'h Avenue NE. Zoning: Acreage: Number of Lots: R-6 7.07 acres 39 Density: Approximately 5.51 units per acre Lot Size: Approximately 4,000 to 7,200 square feet in size Proposed Use: Single Family Detached Dwellings Sewage Disposal: Soos Creek Water and Sewer District Water Supply: Soos Creek Water and Sewer District Fire District: King County Fire District No. 40 School District: Renton School District No. 403 Complete Application Date: October 1, 2004 Associated Applications: Drainage Adjustment L05V0040 (Attachment 2) WHITTAKER, BRUCE SR. ENGINEER DDES/LUSD MS: OAK-DE· 0100 L04POOU2 C. IDSTORY/BACKGROUND: D. The Subdivision Technical Committee (STC) of King County has conducted an on-site examination of the subject property. The STC has discussed the proposed development with the applicant to clarify technical details of the application, and to determine the compatibility of this project with applicable King County plans, codes, and other official documents regulating this development. As a result of preliminary discussions, the applicant presented the Technical Committee with a revised plat on June 30, 2006. The primary modifications include: A boundary line adjustment to the south to eliminate unbuildable lots, the connection of SE 191'' Street to 122"d Avenue SE to the north on the adjacent Plat of Wehrman (File No. L04P0027) for neighborhood connectivity, major revisions to the recreation space provided throughout the plat and incorporating the recreation space tract to be provided by the proposed Cogger Short Plat (File No. L05S0040) located directly adjacent to the property to the south. The Cogger Short Plat File No. L05S0040 will also be sharing access with the Plat ofFleuve Des Voiles, SE 191 st Street. The Plat of Fleuve Des Voiles was originally submitted as the Plat of Soos Creek and was renamed by the applicant during the review process. THRESHOLD DETERMINATION OF ENVIRONMENTAL SIGNIFICANCE: Pursuant to the State Environmental Policy Act (SEPA), RCW 43.21C, the responsible official of LUSD issued a mitigated threshold determination of non-significance (MDNS) for the proposed development on November 9, 2006. This determination was based on the review of the environmental checklist and other pertinent documents, resulting in the conclusion that the proposal would not cause probable significant adverse impacts on the environment provided the following measures are complied with: • The proposed plat of Fleuve des Voiles has as its sole access a new leg of the Southeast l 92"d Street/ 124th Avenue SE intersection. In addition, the applicant for the preliminary plat of Fleuve des Voiles has submitted an application for the Cogger Short Plat. The Cogger Short Plat can not be developed without the public and private infrastructure in the Fleuve des Voiles preliminary plat, since the Cogger plat has no viable access without the roadway system in L04P0002. The two applications share stormwater facilities, are dependent upon one another, and have the same Applicant. The Department considers, for purposes of SEP A, the two applications to be "a development" for purposes of mitigation. • The intersection of Southeast 192"d Street/124th Avenue SE was proposed to be improved as a part of a Capital Improvement Project: CIP 401004. This CIP would have included the construction of tum lanes on SE 192"d Street -to address an identified High Accident Location (14.80.030B) -and signalization of the intersection. Part of the rationale for signalization was to relocate an existing mid- block traffic signal for school-age pedestrians attending the Kent School District's Meeker Middle School. Part of the justification of the improvements was to address deficient levels-of-service on the existing northbound ( currently, the only 'minor street' approach to the intersection) approach to the intersection. • The County Executive's proposed 2007 -2012 CIP budget eliminated funding for this capital project. Funding levels are "$0" within the six-year horizon for adequacy of infrastructure to support this development proposal. No funding is available at the horizon year of the development. The CIP was not funded with MPS fees collected by development in the area. • A calculated deficient level-of-service (14.80.030A) will exist at the horizon year of the development, as calculated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project -and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast 192"d Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips Page 2 of 14 File No. L04P0002 E. will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. 1. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192nd Street/ 124tll Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 ( attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left turn), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. • If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. • Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. Agencies, affected Native American tribes and the public were offered the opportunity to comment on or appeal the determination for 21 days. Neither the MDNS nor the specific mitigation measures were appealed by any party, including the applicant, and they have been incorporated as part of the applicant's proposal. AGENCIES CONTACTED: 1. King County Department of Natural Resources and Parks: The comment from this division have been incorporated into this report. 2. King County Fire Protection Engineer: Fire protection engineering preliminary approval has been granted. 3. Renton School District# 403: The comments from this district have been incorporated into this report. 4. Soos Creek Water and Sewer District (Sewer): The comments from this district have been incorporated into this report. 5. Soos Creek Water and Sewer District (Water): The comments from this district have been incorporated into this report. 6. Washington State Department of Ecology: No response. 7. Washington State Department of Fish and Wildlife: No response. 8. Washington State Department of Natural Resources: No Response. 9. Washington State Department of Transportation: No response. 10. METRO: No response. Page 3 of 14 File No. L04P0002 F. NATURAL ENVIRONMENT: 1. Topography: The property is irregular in shape. The site is comprised of several distinct topographical areas. The eastern portion of the site is relatively flat where the proposed access road, recreation tracts C & I and drainage facilities are located. The central portion of the property slopes upward to the west at an approximate slope of23%. The far western portion of the property is relatively flat. 2. Soils: AgB (Alderwood gravely, sandy loam, 0-6%) and AgD (Alderwood gravely, sandy loam, 15-30%) surfaces soils are found on this site per King County Soil Survey, 1973. a. Ag!! -Alderwood gravely, sandy loam; 0-6% slopes. Runoff is slow and the erosion hazard is slight. This soil type has a moderate limitation for low building foundations due to a seasonally high water table, and severe limitations for septic tank filter fields due to very slow permeability in the substratum. b. AgQ -Alderwood gravely, sandy loam; 15-30% slopes. Runoff is medium and the erosion hazard is severe. This soil has a severe limitation for foundations due to slope, and a moderate slippage potential. It has severe limitations for septic tank filter fields due to very slow permeability in the substratum. Two geotechnical reports were prepared for this plat with the first being prepared by GeoTrends on March 20, 2004 submitted with the application. The second geotechnical report was prepared by Geological & Geotechnical Consulting on -February 15, 2005 and submitted as a revised report. The subject site is underlain by a variety of sediment types that are all related to the most recent glacial advance in the Puget Sol.\Ild lowland. The soils have varying permeability characteristics that result in zones of perched groundwater or interflow. Site topography is also variable with typical slopes on the order of 23 percent and localized areas associated with previous grading of 40% or more. Based on the analysis in the Geotrends, Inc. geotechnical report dated March 20, 2004 and the Gary A. Flowers, PLLC Geologic and geotechnical engineering report dated February 14, 2005, it has been determined that all on site slopes that exceed 40 percent in grade are either less than 20 feet in height or were created through previous legal grading. Therefore they may be legally graded ( or regraded) under King County Code 21A.24.310 D. I and 2. Although not formally mapped for the preliminary plat, portions of the site also meet the definition of an erosion hazard area and will require compliance with King County Code 21A.24.220. Development of the site will likely require a combination of significant grading and retaining wall construction. 3. Wetland/streams: A wetland evaluation and delineation was prepared by H&S Consulting on May 26, 2004. A conceptual wetland mitigation plan was prepared by AC Roth Environmental Services on June 22, 2005. A conceptual buffer mitigation plan was prepared by AC Roth Environmental Services on March 28, 2006. A final mitigation plan will be required prior to engineering plan approval. The site lies within the Soos Creek subbasin of the Green River drainage basin. A Class I Wetland is located off-site within Soos Creek Park to the northeast of the property and the required 100-foot buffer with 15-foot building setback from that buffer will impact the northeastern portion of the property as shown on the revised preliminary plat. 4. Vegetation: This site is moderately wooded with a second and third-growth mixture of coniferous and broad-leafed trees native to the Pacific Northwest. Second-story vegetation, and groundcover consists of Northwest native species including salal, sword fern, berry vines, and grasses. 5. Wildlife: Small birds and animals undoubtedly inhabit this site; however, their population and species are limited due to nearby development. Larger species may visit this site on occasion. No threatened or endangered species are known to exist on or near the property. Page 4 of 14 File No. L04P0002 6. Mapped Sensitive Areas: The Sensitive Areas Map Folio indicates the central portion of the subject property is within Steep Slope Hazard Areas and Erosion Hazard Areas. G. NEIGHBORHOOD CHARACTERISTICS: The property is located in an urban area of King County. Surrounding properties are all single- family detached residences. Currently the site is developed with a single-family residence with detached outbuildings. All existing structures are to be removed. H. SUBDIVISION DESIGN FEATURES: 1. Lot Pattern and Density: The proposed lot and street layout is in conformance with King County Code (KCC) 21A (Zoning). The plat's proposed density of 5.51 dwelling units per acre is in conformance with KCC 21 A 2. Internal Circulation: The site will be served by a sub-access street shown on the site plan with two cul-de-sacs appearing on the ends of 122nd Court SE and 123'd Place SE. 3. Roadway Section: The roads will be designed and constructed to the urban standards of the 1993 King County Road Standards. The applicant will be required to get King County Parks approval in order to improve off-site access to the property at the intersection of SE 192nd Street and 1241h Avenue -,PSE. The applicant has proposed to transfer approximately ~55 s9uare feet ofpropert~ -i_ ,to Kin!_ County Par~ in order to improve this intersection. ~-~\I~ 4. Drainage: The Flueve Des Voiles subdivision is located in the Upper Soos subbasin of the Soos Creek basin. The Fleuves des Voiles site is subject to the Level One flow control and Basic water quality requirements of the 1998 KCSWDM. An adjoining proposed short plat (Cogger short plat L05S0040) is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision, along the south edge. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040 The combined, irregularly-shaped sites slope moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192nd Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. A drainage adjustment (L06V0040) is approved for the Flueves des Voiles and the Cogger short plat sites. The adjustment allows the use of a shared stormwater facility for both sites. The mixing of the two storm water detention requirements (Level 1 and Conservation) can be accomplished with the KCRTS Stormwater design program. I. TRANSPORTATION PLANS: 1. Transportation Plans: The subject subdivision is not in conflict with Transportation, Non-motorized and Trails plan. Page 5 of 14 File No. L04P0002 2. Subdivision Access: The site will gain access from 124'h Avenue SE and 122"d Avenue SE. 3. Traffic Generation: It is expected that approximately 390 vehicle trips per day will be generated with full development of the proposed subdivision. This calculation includes service vehicles (i.e., mail delivery, garbage pick-up, school bus) which may currently serve this neighborhood, as well as work trips, shopping, etc. 4. Adequacy of Arterial Roads: This proposal has been reviewed under the criteria in King County Code 14.70, Transportation Concurrency Management; 14.80, Intersection Standards; and King County Code 14.75; Mitigation Payment System. a. King County Code 14.70 -Transportation Concurrency Management: The Transportation Certificates of Concurrency dated February 7, 2003, April 3, 2003 and May 14, 2003 indicates that transportation improvements or strategies will be in place at the time of development, or that a financial commitment is in place to complete the improvements or strategies within six (6) years, according to RCW 36.70A.070 (6). b. King County Code 14:80 -Intersection Standards: An inadequate Level-of- Service (LOS) has been identified. A calculated deficient level-of-service (14.80.030A) will exist at the horizon year of the development, as calculated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project -and the associated Cogfer Short Plat (L05S0040) will use the access off of Southeast 192" Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192"d Street/ l24'h Avenue Southeast intersection, the applicant will construct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 (attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left tum), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. If funding is restored by future CIP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the determination of a complete application for this subdivision. Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section for review and approval. c. King County Code 14.75 -Mitigation Payment System: King County Code 14.75, Mitigation Payment System (MPS), requires the payment of a traffic impact mitigation fee (MPS fee) and an administration fee for each single-family residential lot or unit created. MPS fees are determined Page 6 of 14 File No. L04P0002 by the zone in which the site is located. This site is in Zone 342 per the MPS/Quartersection list. MPS fees may be paid at the time of final plat recording, or deferred until building permits are issued. The amount of the fee will be determim,d by the applicable fee ordinance at the time the fee is collected. J. PUBLIC SERVICES: 1. Schools: This proposal has been reviewed under RCW 58.17.110 and King County Code 2 lA.28 (School Adequacy). a. School Facilities: The subject subdivision will be served by Benson Hills Elementary School, Nelson Middle School and Lindbergh High School all located within the Renton School District No. 403. b. School Impact Fees: No ordinance requiring impact fees for this school district has been adopted. c. School Access: The District has indicated that the future students from this subdivision will be bussed to the middle and high schools with students walking to the elementary school. This plat will be connecting with the improvements provided by the Wehrman Plat File No. L04P0027 to the north. Roadway conditions in tlte area consist generally of22-foot wide paved roadways with open roadway drainage facilities and limited areas that have gravel shoulders. These open roadway ditches vary in depth and proximity to the roadway traveled. 2. Parks and Recreation Space: The nearest public park is Boulevard Lane Park, located at 1271h Pl. SE and SE l 88 1h Pl., Kent, WA. K.C.C. 21A.14 requires subdivisions in the UR and R zone classifications to either provide on-site recrs,ation space or pay a fee to the Parks Division for establishment and maintenance of neighborhood parks. At this time, the applicant is proposing to provide suitable recreation space, Tract A of the Cogger Short Plat File No. L05S0040 shall be a shared recreation space in addition to Tract C and Tract I. The Subdivision Technical Committee concurs with the applicant's proposal. 3. Fire Protection: The Certificate of Water Availability from Soos Creek Water and Sewer District indicates that water is presently available to the site in sufficient quantity to satisfy King County Fire Flow Standards. Prior to final recording of the plat, the water service facilities must be reviewed and approved per King County Fire Flow Standards. K. UTILITIES 1. Sewage Disposal: The applicant proposes to serve the subject subdivision by means of a public sewer system managed by Soos Creek Water and Sewer District. A Certificate of Sewer Availability, dated June 17, 2005, indicates this sewer district's capability to serve the proposed development. 2. Water Supply: The applicant proposes to serve the subject subdivision with a public water supply and distribution system managed by Soos Creek Water and Sewer District. A Certificate of Water Availability, dated April 6, 2004, indicates this district's capability to serve the proposed development. L. COMPREHENSIVE AND COMMUNITY PLAN: Page 7 of 14 File No. L04P0002 M. N. 1. Comprehensive Plan: This plan is governed by the 2004 King County Comprehensive plan which designates this area as Urban. The proposed subdivision is not in conflict with the policies of the Comprehensive Plan. 2. Community Plans: The subject subdivision is located in the Soos Creek Community Plan. The subject subdivision is not in conflict with the goals, guidelines, and policies of the Soos Creek Community Plan. STATUTES/CODES: If approved with the recommended conditions in this report, the proposed development will comply with the requirements of the County and State Platting Codes and Statutes, and the lots in the proposed subdivision will comply with the minimum dimensional requirements of the zone district. CONCLUSIONS: The subject subdivision will comply with the goals and objectives of the King County Comprehensive Plan and will comply with the requirements of the Subdivision and Zoning Codes and other official land use controls of King County, based on the conditions for final plat approval. 0. RECOMMENDATIONS: It is recommended that the subject subdivision, submitted revised and received June 30, 2006, be granted preliminary approval subject to the following conditions of final approval: I. Compliance with all platting provisions of Title 19A of the King County Code. 2. All persons having an ownership interest in the subj eel property shall sign on the face of the final plat a dedication that includes the language set forth in King County Council Motion No. 5952. 3. The plat shall comply with the base density and minimum density requirements of the R-6 zone classification. All lots shall meet the minimum dimensional requirements of the R-6 zone classification or shall be shown on the face of the approved preliminary plat, whichever is larger, except that minor revisions to the plat which do not result in substantial changes may be approved at the discretion of the Department of Development and Environment Services. Any/all plat boundary discrepancy shall be resolved to the satisfaction ofDDES prior to the submittal of the final plat documents. As used in this condition, "discrepancy" is a boundary hiatus, an overlapping boundary or a physical appurtenance which indicates an encroachment, lines of possession or a conflict of title. 4. All construction and upgrading of public and private roads shall be done in accordance with the King County Road Standards established and adopted by Ordinance No. 11187, as amended (1993 KCRS). 5. The applicant must obtain the approval of the King County Fire Protection Engineer for the adequacy of the fire hydrant, water main, and fire flow standards of Chapter 17.08 of the King County Code. 6. Final plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. Compliance may result in reducing the number and/or location oflots as shown on the preliminary approved plat. Preliminary review has identified the following conditions of approval which represent portions of the drainage requirements. All other applicable requirements in K.C.C. 9.04 and the Surface Water Design Manual (SWDM) must also be satisfied during engineering and final review. Page 8 of 14 File No. L04P0002 a. Drainage plans arrd analysis shall comply with the 1998 King County Surface Water Design Manual and applicable updates adopted by King County. DDES approval of the drainage and roadway plans is required prior to any construction. b. Current standard plan notes and ESC notes, as established by DDES Engineering Review, shall be shown on the engineering plans. c. The following note shall be shown on the final recorded plat: "All building downspouts, footing drains, and drains from all impervious surfaces such as patios and driveways shall be connected to the permanent storm drain outlet as shown on the approved construction drawings # on file with DDES and/or the King County Department of _T_r_a_n-sp_o_rt-at-ion. This plan shall be submitted with the application of any building permit. All connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots that are designated for individual lot infiltration systems, the systems shall be constructed at the time of the building permit and shall comply with plans on file." d: A maintenance access easement to King County is required across Lot 2; for maintenance of the Tract B stormwater facility. e. A drainage conveyance pipe is required to allow for offsite stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSvVDM at engineering plan submittal. The 100-year floodlplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. A drainage adjustment (L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 7. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: ' a. 1241h Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban sub access street standard. b. C. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated. Additional R/W at the northeast corner of the proposed SE 192nd St/124'h Ave SE intersection shall be acquired prior to engineering plan approval. This additional R/W is required to construct the 124 th Ave SE improvements and is shown on a Proposed Land Transfer Diagram received June 30, 2006. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. 8. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final plat recording. Page 9 of 14 File No. L04P0002 9. 10. 11. The applicant or subsequent owner shall comply with King County Code 14.75, Mitigation Payment System (MPS), by paying the required MPS fee and administration fee as determined by the applicable fee ordinance. The applicant has the option to either: (1) pay the MPS fee at the final plat recording, or (2) pay the MPS fee at the time of building permit issuance. If the first option is chosen, the fee paid shall be the fee in effect at the time of plat application and a note shall be placed on the face of the plat that reads, "All fees required by King County Code 14.75, Mitigation Payment System (MPS), have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of building permit application. Off-site access to the subdivision shall be over a full-width, dedicated and improved road which has been accepted by King County for maintenance. If the proposed access road has not been accepted by King County at the time of recording, then said road shall be fully bonded by the applicant of this subdivision. The proposed subdivision shall comply with the Sensitive Areas Code as outlined in K.C.C. 21A.24. Permanent survey marking, and signs as specified in K.C.C. 21A.24.160 shall also be addressed prior to final plat approval. Temporary marking of sensitive areas and their buffers ( e.g., with bright orange construction fencing) shall be placed on the site and shall remain in place until all construction activities are completed. Preliminary plat review has identified the following specific requirements which apply to this project. All other applicable requirements from K.C.C. 21A.24 shall also be addressed by the applicant. Wetlands Class I wetland( s) shall have a minimum buffer of I 00 feet, measured from the wetland edge. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A 15-foot building set back line (BSBL) is required from the edge of all Sensitive Area Tracts and shall be shown on all affected lots. Signage shall be installed along the Sensitive Area Tract boundaries for long term protection and to clearly mark the extent of the tract. Sensitive area tract boundaries shall be clearly marked with bright orange construction and silt fencing prior to construction or site clearing activities. The boundaries shall remain marked until construction is complete. Road crossings of wetlands and/or buffers maybe allowed per KC 2!A.24.330. Construction techniques such as retaining walls maybe required to limit impacts. Allowed impacts shall require mitigation. A final mitigation plan shall be required during engineering review. Off site utility construction within wetlands, aquatic areas, or buffers may require additional permits. This will be reviewed and determined during engineering review. Wetland hydrology may not be altered either during or after development. A hydrology analysis may be required during engineering review to show how wetland hydrology will be maintained after the site is developed. The engineering plans shall be routed to Critical Areas Staff for review of compliance to the above conditions. Page 10 of 14 File No. L04P0002 Alterations to Streams or Wetlands If alterations of streams and/or wetlands are approved in conformance with K.C.C. 21A.24, then a detailed plan to mitigate for impacts from that alteration will be required to be reviewed and approved along with the plat engineering plans. A performance bond or other financial guarantee will be required at the time of plan approval to guarantee that the mitigation measures are installed according to the plan. Once the mitigation work is completed to a DDES Senior Ecologist's satisfaction, the performance bond may be replaced by a maintenance bond for the remainder of the live-year monitoring period to guarantee the success of the mitigation. The applicant shall be responsible for the installation, maintenance and monitoring of any approved mitigation. The mitigation plan must be installed prior to final inspection of the plat. Geotechnical Clearing is not pennitted on this site between October 1 and April 1 unless it is in compliance with King County Code 21A.220 (erosion hazard areas). If clearing is proposed during the October 1 through April 1 time period the applicant must delineate all on-site erosion hazard areas on the final engineering plans ( erosion hazard areas are defined in K.C.C. 2 !A.06.415). The delineation of such areas shall be approved by a DDES geologist, and the requirements found in K.C.C. 21A.24.220 concerning erosion hazard areas shall be met. The applicant's geotechnical engineer shall provide recommendations for the design and construction of the road, onsite grading and compaction, subsurface drainage, and all required retaining walls. The geotechnical recommendations shall be included in the T.I.R. and incorporated into the design with submittal of the engineering plans. The report must specifically address any setback requirements for future structures from any proposed retaining walls, and any setback requirements must be shown on the final engineering plans. Any required easements for maintenance of walls or subsurface drainage must also be provided on the final plans. Special geotechnical construction inspection of the road improvements, onsite grading and compaction, subsurface drainage, and any required retaining walls is required. Special construction inspection of the above construction elements is required to ensure compliance with the geotechnical report recommendations and to address unanticipated soil and groundwater conditions. Daily inspection reports shall be submitted to the assigned King County Land Use Inspector during the Construction phases of those improvements. A final construction report shall be submitted verifying compliance with the geotechnical recommendations and providing foundation design parameters for future residential construction. Notes requiring the above shall be shown on the engineering plans. Geotechnical special inspection of bearing soils for future home foundations is required. Notes to this effect shall be shown on the engineering plans and the final plat. 13. The following note shall be shown on the final engineering plan and recorded plat: RESTRICTIONS FOR SENSITIVE AREA TRACTS AND SENSITIVE AREAS AND BUFFERS Dedication of a sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer. This interest includes the preservation of native vegetation for all purposes that benefit the public health, safety and welfare, including control of surface water and erosion, maintenance of slope stability, and protection of plant and animal habitat. The sensitive area tract/sensitive area and buffer imposes upon all present and future owners and occupiers of the land subject to the tract/sensitive area and buffer the obligation, enforceable on behalf of the public by King County, to leave undisturbed all trees and other vegetation within the tract/sensitive area and buffer. Page 11 of 14 File No. L04POD02 The vegetation within the tract/sensitive area and buffer may not be cut, pruned, covered by fill, removed or damaged without approval in writing from the King County Department of Development and Environmental Services or its successor agency, unless otherwise provided by law. The common boundary between. the tract/sensitive area and buffer and the area of development activity must be marked or otherwise flagged to the satisfaction of King County prior to any clearing, grading, building construction or other development activity on a lot subject to the sensitive area tract/sensitive area and buffer. The required marking or flagging shall remain in place until all development proposal activities in the vicinity of the sensitive area are completed. No building foundations are allowed beyond the required 15-foot building setback line, unless otherwise provided by law. 14. Suitable recreation space shall be provided consistent with the requirements of K.C.C. 21A.14.180 andK.C.C. 21A. 14.190 (i.e., sport court[s], children's play equipment, picnic table[s], benches, etc.). a. A detailed recreation space plan (i.e., location, area calculations, dimensions, landscape specs, equipment specs, etc.) shall be submitted for review and approval by DDES and King County Parks prior to or concurrent with the submittal of engineering plans. b. A performance bond for recreation space improvements shall be posted prior to recording of the plat. 15. A homeowners' association or other workable organization shall be established to the satisfaction of DDES which provides for the ownership and continued maintenance of the recreation space and sensitive area tract(s). 16. Street trees shall be provided as follows (per KCRS 5.03 and K.C.C. 21A.16.050): a. Trees shall be planted at a rate of one tree for every 40 feet of frontage along all roads. Spacing may be modified to accommodate sight distance requirements for driveways and intersections. b. Trees shall be located within the street right-of-way and planted in accordance with Drawing No. 5-009 of the 1993 King County Road Standards, unless King County Department of Transportation determines that trees should not be located in the street right-of-way. c. If King County determines that the required street trees should not be located within the right-of-way, they shall be located no more than 20 feet from the street right-of-way line. d. The trees shall be owned and maintained by the abutting lot owners or the homeowners association or other workable organization unless the county has adopted a maintenance program. Ownership and maintenance shall be noted on the face of the final recorded plat. e. The species of trees shall be approved by DDES if located within the right- of-way, and shall not include poplar, cottonwood, soft maples, gum, any fruit-bearing trees, or any other tree or shrub whose roots are likely to obstruct sanitary or storm sewers, or that is not compatible with overhead utility lines. f. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by DDES prior to engineering plan approval. Page 12 of 14 File No. L04P0002 g. The applicant shall contact Metro Service Planning at (206) 684-1622 to determine if 124'h Avenue SE is on a bus route. If 1241h Avenue SE is a bus route, the street tree plau shall also be reviewed by Metro. h. The street trees must be installed and inspected, or a performance bond posted prior to recording of the plat. If a performance bond is posted, the street trees must be installed and inspected within one year ofrecording of the plat. At the time of inspection, if the trees are found to be installed per the approved plan, a mamtenance bond must be submitted or the performance bond replaced with a maintenance bond, and held for one year. After one year, the maintenance bond may be released after DDES has completed a second inspection and determined that the trees have been kept healthy and thriving. 17. A landscape inspection fee shall also be submitted prior to plat recording. The inspection fee is subject to change based on the current county fees. 18. The following have been established by SEPA as necessary requirements to mitigate the adverse environmental impacts of this development. The applicants shall demonstrate compliance with ese ite s · or to final approval. 19. • c\o..< To implement K.CJ; 21A.38 230 · s to the site, a detailed tree retention plan shall be submitted with the engineering plans for the subject plat. The tree retention plan (and engineering plans) shall be consistent with the requirements of K.C.C. 21A.38.230. No clearing of the subject property is permitted until the final tree retention plan is approved by LUSD. Flagging and temporary fencing of trees to be retained shall be provided, consistent with K.C.C. 21A.38.230.B.4. The placement of impervious surfaces, fill material, excavation work, or the storage of construction materials is prohibited within the fenced areas around preserved trees, except for grading work permitted pursuant to K.C.C. 21A.38.230.B.4.d.(2). 20. A note shall be placed on the final plat indicating that the trees shown to be retained on the tree retention plan shall be maintained by the future owners of the proposed lots, consistent with K.C.C. 21A.38.230.B.6. (Note that the tree retention plan shall be included as part of the final engineering plans for the subject plat.) 21. Transfer of property for intersection improvements at SE 192nd Street and 124th Avenue SE shall require King County Parks approval prior to engineering plan approval. Q. OTHER CONSIDERATIONS: 1. The subdivision shall conform to K.C.C. 16.82 relating to grading on private property. 2. Development of the subject property may require registration with the Washington State Department of Licensing, Real Estate Division. 3. Preliminary approval of this application does not limit the applicant's responsibility to obtain any required permit or license from the State or other regulatory body. This may include, but is not limited to the following: a. Forest Practice Permit from the Washington State Department of Natural Resources. b. National Pollutant Discharge Elimination System (NPDES) Permit from WSDOE. c. Water Quality Modification Permit from WSDOE. d. Water Quality Certification (401) Permit from U.S. Army Corps of Engineers. Pagel3ofl4 File No. L04P0002 R. TRANSMITTED TO PARTIES LISTED HEREAFTER: BOSTON DESIGN & DEVELOPMENT LLC RJCK BOSTON . 13425 E LKKATHLEENDR SE RENTON, WA 98059 BROWN REBECCA 6839 RAVENNA AVE NE SEATTLE WA 98115 BUSH, BEN & GERJ 19124 121 ST PL SE RENTON WA 98058 COGGER 609 GRANT AVE S RENTON WA 98055 . ERVIN, SHAWN 18848 120TH AVE E RENTON, WA 98D58 HALLADIN, STEVE 9118 121 sT PLACE SE RENTON, WA 98058 HALVORSON, NANA BARGHAUSEN CONSUL TING ENGINEERS 18215 72ND AVES KENT WA 98032 HODGE, HAROLD D. 19210121 8 T PL SE RENTON, WA98058 HUMPHREY, TROY 310 29TH ST NE PUYALLUP WA 983 72 JACQUES CONSULTING NEAL JACQUES, P E. 2633 SW 163RD PLACE BURJEN, WA 98166 CLAUSSEN, KIM PROGRAM MANAGER DDES/LUSD DINSMORE, LISA CURRENT PLANNING SUPERVISOR GILLEN, NICK WETLAND REVIEW DES/LUSD GOLL, SHIRLEY CURRENT PLANNING SECTION LANGLEY, KRIS TRAFFIC ENGINEER DDES/LUSD LOCKMILLER, ANNE PROPERTY SERVICES DNR TOWNSEND, STEVE LAND USE INSPECTIONS TIBBITS, CHAD PLANNER DDES/LUSD WEST, LARRY GEO REVIEW/LUSD WHITTAKER, BRUCE SENIOR ENGINEER DDES/LUSD KC HEARJNG EXAMINERS OFFICE ATTN: MARKA OR GINGER L04P0002 FLEUVES DES VOILES MS: YES -CC-0404 Page 14 of 14 File No. L04P0002 -~ 1-I~ 1J I ,,1. I ,.o,;• , I I _ _jl----J/ r~:~1: --,~i\.,1 l!f ,m II"' ,._i\l, 1,,,- J;~f\ .... i;T~TI I : . \ '. I . ... .. . ! , I "B~ ', : : ~.,;..,<vq \ ·~ ' ·~ 5 JAITACHMENT # __,/ __ , <® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 July 20, 2006 Charles Spaeth 6839 Ravenna Avenue NE Seattle, WA 98115 Lorna Taylor TEC, Inc. 205 Front Street South/P ,0, Box 1787 Issaquah, WA 98027 RE: Fleuves des Voiles Subdivision 1998 KCSWDM Adjustment Request /File No. L06V0040) Dear Applicant and Engineer: The Land Use Services Division, Engineering Review Section, has completed review of the adjustment request for the Fleuves des Voiles subdivision. You are requesting approval for an adjustment from the 1998 King County Surface Water Design Manual (KCSWDM) Core Requirement No. 1, Section 1.2.1, Discharge at the Natural Location and Core Requirement No. 3, Section 1.2.3, Flow Control. You are also requesting approval for an adjustment to utilize an off-site stomi water facility and formalize its shared use through Special Requirement No. 1, Section 1.3.1, Share.ct Facility Drainage Plans with the Shared Facility Plan Guidelines published in a memo dated September 15, 1999. Our review of the information and a site visit provides the following findings: . I. The proposed Fleuves des Voiles subdivision is located at 12216 SE 192°d Street. The 39 lot, 6. 74 acre, proposed Fleuves des Voiles subdivision is undergoing preliminary approval under Land Use Services Division (LUSD) file number L04P0002. The Feuves des Voiles subdivision will be dedicating a separate tract to King County for the combined shared facility. 2. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040. 3. The subdivision and short plat are both located in the Upper Soos sub basin of the Soos Creek basin. The upper and lower portions of the Fleuves des Voiles site are subject to the Level Two and Level One flow control, respectively, and Basic water quality requirements of the 1998 KCSWDM. Tbe Cogger short plat is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. ATTACHMENT__.~~~ -P,,,-A~~=E=-Of_z~A,,_G,_E.,..-- Fleuves des Voiles/L06V0040 July 20, 2006 Page 2 of 4 4. The combined, irregularly-shaped site slopes moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. 5. · The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192°d Street right-of-way. As a result, predeveioped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. Nuisance flows to adjoining residential properties would be largely eliminated. 6. No decorative ponds or shallow wells have been identified that would be affected by the proposed diversion. 7. Because the Fleuves des Voiles site is split between Level One and Level Two flow control, the proposal is to also allow the Level One flow control requirement to prevail due to the location and release point of the proposed facilities. When viewing the Fleuves des Voiles project on its own, this issue is not an adjustment issue and has been allowed as proposed based on previously established interpretation and policy. However, the implied request to allow the Cogger short plat to also utilize the Level One flow control criteria given its vesting to the 2005 KCSWDM, is an adjustment issue. 8. The Conservation Flow control standard (Level Two and•preforested conditions) defined in the 2005 KCSWDM has become the default flow control standard to protect the environment of and allow for the restoration of water quality or habitat functions essential to salmonids. Because the 1998 KCSWDM Level One flow control standard is not equivalent to this upgraded standard, the Cogger short plat will not be allowed to utilize the Level One flow control standard. Mixing the two flow control requirements together can be accomplished with the KCRTS methodology. 9. The proposal is to also officially acknowledge the accommodation of the Cogger short plat into the shared facility design of the off-site: Fleuves des Voiles stormwater facility. The same applicant controls both developments and has indicated that both developments and the shared facility will be constructed concurrently since the short plat is also dependent on the plat for its access and recreation space. 10. Blanket adjustment L05V0067, signed 11/3/05, allows the use of StorrnFilter 360 cartridge filter catch basins for projects vested to either the 1998 or 2005 KCSWDM. ATIACHMENT d ~2,=--'·'. __ _2_ ___ _ PAGE PAC.;f: Fleuves des Voiles/L06V0040 July 20, 2006 Page 3 of4 The blanket adjustment defines the limits of use and design criteria to be utilized when using this type of facility. 11. The Level One Drainage Analysis identified no restrictions or problems associated with the proposed discharge locations. 12. A consolidation of facilities for the proposed subdivision will be more economical in long term maintenance. Based on these findings, we hereby approve this adjustment to 1) allow the diversion of runoff to two separate storm water facilities near the north and south ends of the combined site, and 2) utilize the shared facility plan concept to allow combining the Cogger short plat into the northern stormwater facility, but 3) deny the Cogger short plat from utilizing the Level One flow control standard due to lack of equiva!ency, with the following conditions: 1. The release rates for the detention facilities will be based on the entire tributary area being directed to the facilities. 2. The volume for the detention facilities will be based on all flows directed to the facilities at full development under current zoning. The allowed release rate will be reduced by any undetained flows that would bypass the proposed subdivision drainage facilities. The detention volume shall be sized using the Level One flow control standard in the 1998 KCSWDM for the F!euves des Voiles plat and the Conservation flow control standard in the 2005 KCSWDM for the Cogger short plat. The design Technical Information Report shall state the factor of safety selected and the basis of that determination. 3. Water quality facilities must be sized based on the entire proposed subdivision draining to the facilities including any required frontage improvements. 4. All onsite or offsite drainage facilities must be located in a public right-of-way, recreation space tract with easement or storm drainage tract dedicated to King County. 5. The developer of the shared facility is responsible for any cost sharing agreements that may be set up as part of the implementation of the shared facility plan. 6. Engineering plans for the Cogger short plat shall note this approved facility plan. 7. Additional storm drainage requirements identified by SEP A or the plat hearing review will apply to this project. The applicant retains all rights and privileges afforded in Section 1.4. If you have any further questions regarding this KCSWDM adjustment or the design requirements, please contact Mark Bergam at (206) 296-7270. ATTACHMENT___,~"'--~ _3~·=--·~~-.--2 __ PAGE PAGE Fleuves des Voiles/L06V0040 July 20, 2006 Page 4 of 4 Sincerely, James Sanders, P.E. Development Engineer Engineering Review Section Land Use Services Division l;:;im Chan, P .E. Supervising Engineer Site Engineering and Planning Section Building Services Pivision cc: Curt Crawford, P.E., Managing Engineer, Stormwater Services Section, KCDNR Bruce Whittaker, Engineer III, Engineering Review Section, LUSD Chad Tibbits, Project/Program Manager II, Current Planning Section, LUSD Mark Bergam, P.E., Engineer III, Engineering Review Section, LUSD A TT AC HM ENT .--9.2'---- --P-!--,:G~E=--C --'lGE- ' king Cotmty Department of Development and Environmental Senices 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Project Name: Fieu_vc des Vo; /es P1,d- Ars1D Co e,r Shorl-Pk-f Project Address: 122..1 (., <;;e'. Jqz_..._J St. I\ City, iltthl1CI ,tilf'. Ale Surface Water Design Manual Requirements/ Standards Adjustment* Request DDESProjec!FileNo.: LD'-/ 0002 LD5$(XJi-/0 DOES Engineer/Planner Name: ; B('w:e \Ji, Hak&r I Cna_d T, bb;-h, Engineering F JEC In. c_. Phone: I-ILilS- oate: d2t o& Address: / City, State, Zip Code: 20S' /Cy-on+ ~ff. Alis 17f 7 ! 5Sa. vaA W, . '> r/'l>I INSTRUCTIONS TO APPLICANT/DESIGN ENGINEER: Please be sui-e to lnciude all plans (T.1.R, if availabte}, sketches, photos arid maps that may assist In complete review and consideration of this adjustment request. Failure to provide all pertinent Information may result In delayed processing or denial of your request. Please submit M'9 COWPlete @PIAA Of this Cft9UMt appljcatlon form and aDPligabJe fee to the DOES Intake Counter, at 900 Oakesdale Avenue Southwest, Renton, Washington 9805S.1219. FQr additional Information, phone Randall Parsons, P .E., at (206} 296-,7207. RD'ZR TO SEC'UON 1. 4 IN CllaP'l'ER 1 OP '1'1111 St!Rll'ACII 111.'l'lll!. DIISIGIN MllNIIAL ll'OR ADJO'S'l'MIIN'1'S DESCRIPTION OF ADJUSTMENT REQUEST: ~ Standard D Complex D Experimental D Blanket D Pre-application .,.. J1 _ h d c,('e Q.Tf"'-C -e APPLICABLE VERSION KCSWDM: D 1990 (11/95) • _12(1995 (9/98) Jl( lQQS • (Note: the term "variance" replaced by "adjustment") APPLICABLE SECTION($) OF STANDARDS: C.nre COY'( JUSTIFICATION PER KCSWDM SECTION 1.4.2 A See attachments listed below. AUTHORIZATION SIGNATURES: DETERMINATION: D Approva! "1, Conditional Approval (see below) D DNR/WLRD Approval Signed: -f7-ff-,..,...7'7~- D Denial DDES Staff Recommendation Signed: ~~~~~~~=~Q~g;_~------~ Condhlons of Approval: See attached Memo Dated: ODES DIRECTOR/DE IGNEE: ., Engineering Aevlew·Suparvfsor. ODE , Bldg. Sarv. Div., Stta Engineering & Plannlng ATTACHMENT-Jo) [g@ [g.fl w [g[Q) ~R182006 · --~ .. _:;: ~4-bEl<.C. 0.0.E.S. . Justification per KCSWDM Adjustment Request: Adjustment No.L06V0040 June 21, 2006 F ollo'W"ing are 4 standard adjustments required for the proposed drainage detention system proposed for the Fleuve des Voiles Plat Application L04P0002 and Cogger Short Plat Application L05S0040. 1. Standard adjustment to 2005 Manual Core Requirement #1, Discharge at the Natural Location. The project proposes to discharge project runoff to the Soos Creek wetland slightly north (upstream) of the natural location. It is impossible to retain the existing sheet flow discharge condition along the entire east property line and still comply with Core Requirement #3, Flow Control. Additionally, this scenario is preferable because strict compliance with Core Requirement # I woul.d result in discharge to the neighboring backyards creating an Wlacceptable situation for the adjac1:nt property owners. 2. Standard adjustment to 2005 Manual Cqre Requirement #1, Discharge at the Natural Location. The project proposes to discharge !Wloff from 124th Avenue SE to the Soos Creek wetland at l 92"d Street, slightly south (downstream) of the natural location. It is impossible to provide treatment of rWlOff and retain the existing sheet flow discharge condition along the entire east side of the roadway because the edge of the roadway is at the property line and the neighboring property owner (King County Parks Department) so far will not grant a drainage easement for discharge of this fWlOff. 3. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. The project proposes to use Level 1 detention criteria for the entire site. The project site contains both Level 2 and Level 1 detention areas. The upper hillside portions are subject to Level 2 detention requirements and the lower portions to Level 1. In Heu of Level 2 detention, the project proposes to tightline all runoff from the upper hillside down to a Level 1 detention pond at the base of the hill in the level l detention area. This will meet and exceed the intent of the code by removing all fWlOfffrom the erosion sensitive hillside as opposed to a controlled release as strict adherence to the code would require. 4. Standard adjustment to 2005 Manual Core Requirement #3, Flow Control. These projects propose to detain and treat runoff in a single facility located in the Fleuve des Voiles Plat property, subject to approval of a Shared Facility Plan. A shared facility will reduce the number of drainage facilities that King County will need to maintain. The two projects are adjacent and share all access and utilities. Combining stonnwater is a logical extension of this concept. Note on all aqjustrnent requests: The Fleuve des Voiles Plat is vested under the 1998 KCSWDM and the Cogger Plat must comply with the 2005 KCSWD,\1. The existing sire runoff calculations used for sizing the detention system comply with the 2005 Manual requirements for Cogger and the J 998 Manual requirements for Fleuve des Voiles. This means that the Cogger Short Plat area was modeled as fully forested for the existing conditions. The pond itself complies with the requirements o/2005 KCSWDM . r) ATTACHME/\IT __ L_ {; 1 PAGE _, PAGE J ..... ,:" EXISTING SllE; FOREST: 303,801 ( 6. 97) · BUILDING: 1,364 (0.03) PAVEMENT: 12,243 (0.28) LANDSCAPE: 16,800 (0.39) TOTAL: 334,208 (7.67) N EB 0 I 1:; ; SCALE: 1" ~ ATT ACHMENT__.2,c.__ -:-PAzE __ _ \ \ \ \ LEU~ DES· VOILES\ \ ·i \_ \ " 150 : 150 fL Whittaker, Bruce To: Cc: Subject: Tibbits, Chad Langley, Kristen Flueve Des Voiles L04P0002: Proposed Conditions Attachments: FlueveDesVoilesCond.doc Chad, Please see my proposed conditions attached. Thanks, Bruce Whittaker I 1/02/2006 Page 1 of 1 Bruce Whittaker 10/30/2006 Flueve Des Voiles L04P0002 Proposed Conditions 8. The drainage facilities shall meet the requirements of the 1998 King County Surface Water Design Manual(KCSWDM). The facilities shall meet the requirements for Level 1 Flow Control and Basic Water Quality menu in the KCSWDM. 9. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. I 0. A drainage conveyance pipe is required to allow for offsite storm water conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSWDM at engineering plan submittal. 11. The I 00-year floodlplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. 12. A drainage adjustment(L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 13. The following road improvements are required to be constructed according to the 1993 King County Road Standards(KCRS): a. 124'h Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. A land transfer agreement between the applicant and KC Dept. of Natural Resources and Parks has been negotiated. Additional R/W at the northeast comer of the proposed SE 192nd St/124th Ave SE intersection shall be acquired prior to engineering plan approval. This additional R/W is required to construct the 124th Ave SE improvements and is shown on a Proposed Land Transfer Diagram received June 30, 2006. b. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. • c. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. Drainage Narrative The Flueve Des Voiles subdivision is located in the Upper Soos sub basin of the Soos Creek basin. The Fleuves des Voiles site is subject to the Level One flow control and Basic water quality requirements of the 1998 KCSWDM. An adjoining proposed short plat ( Cogger short plat L05S0040) is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision, along the south edge. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040 The combined, irregularly-shaped sites slope moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192"d Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192"d Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. A drainage adjustment(L06V0040) is approved for the Flueves des Voiles and the Cogger short plat sites. The adjustment allows the use of a shared stormwater facility for both sites. The mixing of the two stormwater detention requirements(Level 1 and Conservation) can be accomplished with the KCRTS Stormwater design program. , King County Department of Development and Environmental Services State Environmental Policy Act (SEPA) Mitigated Determination Of Non-Significance for L04P0002-Fleuve Des Voiles{formerly Soos Creek) Date of Issuance: Project: Location: King County Permits: SEP A Contact: Proponent: Zoning: Community Plan: Drainage Subbasin: Sectionrrownship/Range: Notes: November 9, 2006 Subdivision of 6.8 acres into 39 lots for the development of single- family detached residences in the R-6 zone. The proposed lots are approximately 4,000 to 12,000 square feet in size. The site is located on the north side of SE 192°d Street, west of 124 th Avenue NE. Formal subdivision Chad Tibbits, Planner (206) 296-7194 or email at chad. tibbits:almetrokc.gov Charles Spaeth 6839 Ravenna Avenue NE, Seattle, WA 98115 (206) 526-848 I R-6 Soos Creek Soos Creek SW-33-23-05 A. This finding is based on review of the project site plan revised and received dated June 30, 2006, environmental checklist dated February 4, 2004, Level I Downstream Drainage Analysis received March 31, 2006 (revised), Conceptual Buffer Mitigation Plan received March 31, 2006, Conceptual Grading and Drainage Plan (revised) dated March 31, 2006, Traffic and Intersection Report received February 4, 2004, Conceptual Signal Plan dated November 7, 2006, Wetland Evaluation and Delineation Report received September 16, 2004, Traffic Impact Analysis (revised) received June 23, 2005, Geological and Geotechnical Engineering Study (revised) received June 23, 2005 .and other documents in the file. WHITTAKER, BRUCE SR. ENGINEER DDES/LUSD MS, OAK-DE-0100 L04P0002 L04P0002 -Fleuve Des Voiles (formerly Soos Creek) November 9, 2006 • Page 2 B. Issuance of this threshold determination does not constitute approval of the permit. This proposal will be reviewed for compliance with all applicable King County codes which regulate development activities, including the Uniform Fire and Building Codes, Road Standards, Surface Water Design Manual, and the Sensitive Areas Regulations. Threshold Determination The responsible official finds that the above described proposal does not pose a probable significant adverse impact to the environment, provided the mitigation measures listed below are applied as conditions of permit issuance. Mitigation List: The following mitigation measures shall be attached as conditions of permit issuance. These mitigation measures are consistent with policies, plans, rules, or regulations designated by KCC 20.44.080 as a basis for the exercise of substantive authority and in effect when this threshold determination is issued. Key sources of substantive authority for each mitigation measure are in parentheses; however, other sources of substantive authority may exist but are not expressly listed. • The proposed plat of Fleuve des Voiles has as its sole access a new leg of the Southeast 192nd Street/ 124'h Avenue SE intersection. In addition, the applicant for the preliminary plat ofFleuve des Voiles has submitted an application for the Cogger Short Plat. The Cogger Short Plat can not be developed without the public and private infrastructure in the Fleuve des Voiles preliminary plat, since the Cogger plat has no viable access without the roadway system in L04P0002. The two applications share stormwater facilities, are dependent upon one another, and have the same Applicant. The Department considers, for purposes of SEP A, the two applications to be "a development" for purposes of mitigation. • The intersection of Southeast 192nd Street/124'h Avenue SE was proposed to be improved as a part of a Capital In1provement Project: CIP 401004. This CIP would have included the construction of tum lanes on SE 192nd Street -to address an identified High Accident Location (14.80.030B)-and signalization of the intersection. Part of the rationale for signalization was to relocate an existing mid- block traffic signal for school-age pedestrians attending the Kent School District's Meeker Middle School. Part of the justification of the improvements was to address deficient levels-of-service on the existing northbound ( currently, the only 'minor street' approach to the intersection) approach to the intersection. • The County Executive's proposed 2007 -2012 CTP budget eliminated funding for this capital project. Funding levels are "$0" within the six-year horizon for adequacy of infrastructure to support this development proposal. No funding is available at the SEPA Determination.doc 7/27/99 clc ' ' L04P0002 -Fleuve Des Voiles (formerly Soos Creek) November 9, 2006 Page3 horizon year of the development. The CIP was not funded with MPS fees collected by development in the area. • A calculated deficient level-of-service (14.80.0JOA) will exist at the horizon year of the development, as calclllated by the applicant's consultant, during the morning peak hour. Until the completion of the northerly connection of the project, through the preliminary plat of Wehrman (DDES File #L04P0028), 100% of the trips from the Fleuve des Voiles project -and the associated Cogger Short Plat (L05S0040) will use the access off of Southeast l 92"d Street. After completion of the preliminary plat of Wehrman, 20% or more of the Fleuve des Voiles project trips will impact this intersection. Individually, and joint with the Cogger Short Plat, more than 30 peak hour trips will impact the intersection. I. In order to mitigate the significant adverse impact (14.80.030A and 14.80.030B) that the proposed development will have at the intersection of Southeast 192"d Street/ !24th Avenue Southeast intersection, the applicant will constrnct a traffic signal system at this intersection. This signalization system will be in general conformance with the conceptual signalization submitted to KCDOT on November 8, 2006 (attached), This signalization system will be in general conformance with the conceptual signalization exchanged between the Department of Transportation and the Applicant's consultant engineer on/about 27 October 2006, and include all related signalization system appurtenances necessary for the identified signal operation (including a protected/permitted phasing for the westbound left tum), and an advance warning flasher system located to the west of the intersection. These improvements shall be designed to minimize future reconstruction if/when the deferred/cancelled CIP is constructed. • If funding is restored by future CTP budgets, AND a portion of the funding source is revised to include MPS fees from development, the developer may be entitled to the MPS credit provisions that were in effect at the time of the dctennination of a complete application for this subdivision. • Plans for these improvements shall be submitted to the King County DOT Traffic Engineering Section f,:ir review and approval. Comments and Appeals Written comments or any appeal of this threshold determination must be received by King County's Land Use Services Division prior to 4:30 PM December 4, 2006. Appeals must be accompanied by a nonrefundable filing fee. Please reference the file numbers when corresponding. Appeals must be in writing and state the perceived errors in the threshold determination, specific reasons why the determination should be reversed or modified, the harm the appellant will suffer if the threshold detem1ination remains unchanged, and the desired outcome of the appeal. If the appellant is a SEPA Detennination.<loc 7/27/99 clc L04P0002 -Fleuve Des Voiles (formerly Soos Creek) November 9, 2006 ' Page 4 group, the hann to any one or more members must be stated. Failure to meet these requirements may result in dismissal of the appeal. Comment/appeal deadline: Appeal filing fee: Address for comment/appeal: J ---1~==-"'=----+~=~.---i:· ~ Lisa Dinsmore, Curr t Planni Current Planning Section Land Use Services Division SEPA Detennination.doc 7/27/99 clc 4:30 PM on December 4, 2006 $250 check or money order made out to the King County Office of Finance King County Land Use Services Division 900 Oakesdale Avenue SW Renton, WA 98057-5219 ATTN: Current Planning Section /o£signed ' .. ii 11 ,, i; • l ! J r:'\ New .. signtl.pole in _NW c11rniir ~tll includec 1 sign-a.! head., (.one }·Section u.d OH ~_-;tction for wedbound left turn protec.<,.d-permitted l' ~ pbuing), t pedestntn sigtitl betd u,d pusb. b11ttnn for new north leg crou,ult, t Video detection camera for weittiouad tppraach, : t.nd emergency pre-emption far both E:8 tnd WB tpprouhes. Foundtti/Jll iha!l he I or.a.led behind future King County C[P impra'!ements ! u drnwn. Aret shall be level and pavc:d to U.ce or pole. Signt! pole rba!I indnde ollt fumfoure arc.. Signal hnd mount1ngs sh:i..11 use utro r c ep Bn,ting utility po!et to be refoct.ted with D.ortb leg rotd 1rnprovetllenh. 1 · (n\ The n:Jrtb l.lld &outh leg 'i'Cb!cle detection shall be ill grnn.nd loops with tptcing in 2cco1dance with KC requi1ement~ j: 'U lfl ,:;--.. lnctitl! crnuwa!\:: ,i.nd ilop ban u ,bown )ll accordimce with King County requirements l j \:::_) I G) ,I New frgna! pole in NE corner ,hall indu.de 2 ;i ntl heads, 2 pedettnan heaih llld pu,h buttou. Signal ole ,hall ind.ide ': one !umiuile arm. Si1ntl heu! moullting11 sb.a* n~e tenou. [n thi11 en.nm, the ~ontrol!er ubinet anf iervice c~b1net ihtll h i~;taJJ~. Ji Are:a ;haf[ be level t.11.d pav\\il uo11nd controller ud ~ervice ctbineh ud role to top o[ e~rb. . Location of ilg:na! pole [011ntttion 1b:2.!! be behind fnture King County C P improv.ernents. 1J'"- r:;\ New ;ignal p-0Le in SW cill"llef stlall include 2 i:i,nal be1ds, ud l emeaency vehicle de!ector:1, and lumiu.ire arm. '\V Location o! ;igul pole foundttion shaU be behi~de flltnre E:C C!P 1mprovemenli. A separ;i;tt p_edettriu rigntl pole shall be conatructed near the exi1ting_ crouwilk. and include o!Lt pede5tritn SJ.g:ll.d he1d tod purh bottoo, pla, one "1p. prohibiting cromng the we;! leg. -$ .,..,,,,.,.--Flenve De-.: Voiles rald improvement$ (nortb 1q:J .,)'*' ~--' SE-192NDST--- ~ ~ ___ G --------=--=--________ __.... 0 © New stgnat pcle in SE corner ~ha.11 include 1 sitn11 bea.d-;, tnd one video detection ca::nera [~ting weit. tfo l~mrnure Mut um to coosilfer fu.ttlre EB left 1unt lane with (oture tenon, no sigu! hetd. Ptde1triao ,igna.l hud, ~nd pus_h bcttons lo bein~b.!led on pole. Exirting fenu ~nd g:tbi()!l wall need t~.be re,nivcd with can1iderii1ao ,if pedestrian 1ccen to bnttont. Conf11cling overhetd power lOd underground uli!it1e1 u well. Due to grade and Y1sibil:y, tn advance wuning auber (8" LED beacon: with w3.3 si~D ~hi! be ilLSi:i.lled oo wood or metal po~I. in additon, an advt!lCt emerge!lcy veb.ide prt·em.ptlOD deteclor shdl be 1ust.a..lled nt [he ~ame pole or in ,i si;nit1r :oc~t1on CoorO:intt~ with Cou.nty (Scott S~whi!II regudu1g Joution. W\LLlA.M POf!' A.SSOCU.T!S. CONCEPTUAL SIGNAL PLAN 1'«Klkl-J:.it,~ '"-"-~!.i~ ,u ... .,.o_... ..... Q SE rn2Md Sl/12.tth A~e SE ~in9 Counly, WA ~ I lit I' 111 ji r J~I II of' I ' I , ' ! I 'l i F Iii ' I <!LJj I ' t: !1 n::1 (1 §i 0 I! ! ' D F 19fod&~,( ~ 15 • lHlll A.n,,,. SE 10..00 ~ --~- GENERAL NOTES J. Signil Phuint ihall be 3-pbue·. with protected/pmniHive Wll Jef( t,:o ESIWB video detection sha.11 be mounted on m&i( um with 5' nstt No pedestrian crnawalt or pedet1rian 1ifnal tor _not !eg (. A_ll ~1ru! pole founrl.at1ons sht!I be [eve with K1:i.~ County C:P gnde 5 · i~f~:f. ?:n'"in~0;h~f~e ~no~~fr~Ni~fs1 1 :r~eat1~fi~WliDcatrots FLEUVE DES VOILES DDfSr LO>P~OO! ~ 8 ~ :r ~ ® Notice of Decision- Department of Development and Environmental Services Land Use Services Division SEPA Threshold Determination and Notice of Recommendation & Hearing 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 File No.: L04P0002 Project Name: Fleuve Des Voiles Subdivision (Formerly Soos Creek) ODES Project Manage.: Chad Tibbits, 206-296-7194 Email: chad,ti.bbits@metrokc.gov Applicant: Project Location: Project Desc;ription: Permits Requested: Charles Spaeth 6839 Ravenna Avenue NE, Seattle, WA 98115 206-526-8481 The.site is located on the north side.of SE 192"d Street, west of 124th Avenue NE, appreximately 19100-124'h Avenue SE, Renton, WA. Subdivision of approximately 6.8 acres into 39 lots for the development of single family detached residences in the R'-6 :zone. The proposed lots range in si.ze from approximately 4,000 to 12,000 square feet. Formal Subdivision Department Recommendation to the Hearing Examiner: Approve, subject to conditions Date of Public Hearing: December 12, 2006, 1 :30 pm DOES Hearing Room-first floor 900 Oakesdale Ave SW Renton, WA 98055-1219 SEPA Threshold Determination: Determination of Mitigated Non-Significance (MONS) Issued November 9, 2il06 The Department of Development and Environmental Services (DOES) will issue a written report and recommendation to the Hearing Examiner two weeks prior to the scheduled public hearing. Persons wishing to receive a copy of the report should contact ODES at the address listed below. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Appeal procedures will be stated in the Examiner's written decision. Any person wishing additional information on this proposed project should contact the Project Manager at the phone number listed above. Written comments may also be submitted to ODES. A public hearing as required by Jaw will be held to consider the approval of this application. If the Renton School District announces a district-wide school closure due to adverse weather conditions or similar area emergency, the public hearing on this matter will be postponed. Interested parties will be notified of the time and date of the rescheduled hearing. Any questions regarding postponements and rescheduling can be directed to the Hearing Examiner's Office at (206) 296-4660. Comment/Appeal Procedure on SEPA Threshold Determination: Comments on this SEPA determination are welcome. This SEPA determination may also be appealed in writing to the King County Hearing Examiner. A notice of appeal must be filed with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006, and be accompanied with a filing fee of $250.00 payable to the King County Office of Finance. If a timely Notice of Appeal has been filed, the appellant shall also file a Statement of Appeal with the Land Use Services Division at the address listed below prior to 4:30 p.m. on December 4, 2006. The Statement of Appeal shall identify the decision being appealed (including the file number) and the alleged errors in that decision. Further, the Statement of Appeal shall state: 1) specific reasons why the decision should be reversed or modified; and 2) the harm suffered or anticipated by the appellant, and the relief sought. The scope of an appeal shall be based on matters or issues raised in the Statement of Appeal. Failure to timely file a Notice of Appeal, appeal fee or Statement of Appeal, deprives the Hearing Examiner of jurisdiction to consider the appeal. Appeals must be submitted to the Department of Development and Environmental Services (DOES) at the following address: Date Mailed: November 9, 2006 DDES--Land Use Services Division Attn: Permit Center 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 If you have any questions regarding the appeal procedures, please contact the Planner at the phone number listed above. If you require this material in braille, audio cassette, or large print, call (206) 296-6600 (voice) or (206) 296-7217 (TIY). ' L04P0002 Bruce Whittaker DDESILUSD MS OAK-DE-0100 November 14, 2006 OFFICE OF THE HEARING EXAMINER KING COUNTY, WASHINGTON 400 Yesler Way, Room 404 Seattle, Washington 98104 Telephone (206) 296-4660 Facsimile (206) 296-1654 Email: hearex@metrokc.gov NOTICE OF HEARING SUBJECT: Department of Development and Environmental Services File No. L04P0002 Proposed Ordinance No. 2006-0565 FLEUVE DES VOILES Preliminary Plat Application Location: On the north side of SE 192nd Street, west of 124th Avenue Northeast, approximately 19100-!24th Avenue Southeast, Renton Applicant: Charles Spaeth 6839 Ravenna Avenue Northeast Seattle, Washington 98115 Telephone: (206) 526-8481 King County: Department of Development and Environmental Services (ODES) represented by Chad Tibbits 900 Oakesdale A venue Southwest Renton, Washington 98055 Telephone: (206) 296-7194 Facsimile: (206) 296-7051 A public hearing has been scheduled on this proposal for 1 :30 p.m. on December 12, 2006, in the Department of Development and Environmental Services Hearing Room, 900 Oakesdale Avenue SW, Renton, Washington. Any primary party wishing to reschedule the hearing for a different time or location must make a request in writing to that effect and must obtain the written concurrence of all other primary parties, which shall be submitted to the Hearing Examiner's Office at the above address within 7 days of the date of this notice. Primary parties include the applicant, property owner, and responsible County agency. (Other persons likely to be directly and substantially affected by County action on this proposal may request "party" status by submitting an intervenor petition to the Hearing Examiner.) Agreement to reschedule this proceeding shall constitute waiver by the parties of procedural time limits for its occurrence. A pre-hearing conference may be requested by any primary party prior to November 28 , 2006. Hearing Examiner Rule VIII, which is included with this notice, governs pre-hearing conferences. If you are a party to this proceeding and believe a pre-hearing conference should be held prior to the public hearing, submit your written request with speci fie reasons in support thereof to the King County Hearing Examiner. L04P0002 -Fleuve des Voiles Page 2 of3 To promote efficiency in the conduct of hearings and to eliminate surprise, pre-hearing exchange of information is encouraged by the Rules of Procedure. Any person is entitled to receive, at cost, copies of documents in the County file. Application may also be made to the Examiner to direct exchange of other significant information by any person or agency. Mediation of disputes is available pursuant to King County Code Section 20.24.330 and Rules of Mediation. Please contact the Office of the Hearing Examiner if you need a copy of the Rules of Procedure or Rules of Mediation, or obtain the Rules by visiting our web site at www.metrokc.gov/mkcc/hearingexaminer. ORDERED November 14, 2006. Peter T. Donahue King County Hearing Examiner TRANSMITTED November 14, 2006, to the following parties and interested persons: Barghausen Cons. Eng. Rebecca Brown Ben & Geri Bush Attn: Ivana Halvorson. 6839 Ravenna Ave. NE 19124 -!21st Pl. SE 18215 -72nd Ave. S. Seattle WA 98115 Renton WA 98058 Kent WA 98032 Cogger Shawn Ervin Steve Hall a din 609 Grant Ave. S. 18848 -120th Ave. SE 19118 -121st Pl. SE Renton WA 98055 Renton WA 98058 Renton WA 98058 Harold Hodge Troy Humphrey Jacques Consulting 19210 -121st Pl SE 310-29th St. NE Attn: Neal Jacques Renton WA 98058 Puyallup WA 98372 2633 SW 163rd Pl. Burien WA 98166 De-En Lang Boston Design & Dev., LLC Lozier Homes, Corp. Lang Assoc., Inc. Attn: Rick Boston Attn: Jennifer McCall 10658 Riviera Pl. NE 13425 E Lk Kathleen Dr. SE 1203 -I 14th Ave. SE Seattle WA 98125 Renton WA 98059 Bellevue WA 98004 Muckleshoot Cult. Res. Seattle KC Health Dept. Charles Spaeth Attn: L. Murphy & T. James E. Dist. Environ. Health Ravenna Devel., LLC 39015 -172nd St. SE 14350 SE Eastgate Way 6839 Ravenna Ave. NE Auburn WA 98092 Bellevue WA 98007 Seattle WA 98115 Mark Stevens Sean & Linda Warren Marvin Wehrman 19225 -124th Ave. SE 19125 -!21st Pl. SE 5115-33rdAve. W. Renton WA 98058 Renton WA 98058 Everett WA 98203 Tim Wheeler Mark & Joyce Wilson Kim Claussen 12131 SE 188th St. 19205 -124th Ave. SE DDES/LUSD Renton WA 98058 Renton WA 98058 MS OAK-DE-0100 ' ' L04P0002 -Fleuve des Voiles Lisa Dinsmore DDES/LUSD MS OAK-DE-0100 Kristen Langley DDES/LUSD MS OAK-DE-0100 Larry West DDES/LUSD MS OAK-DE-0100 Nick Gillen DDES/LUSD MS OAK-DE-0100 Chad Tibbits DDES-LUSD MS OAK-DE-0100 Kelly Whiting KC DOT, Rd. Srvcs. Div. MS KSC-TR-0231 Page 3 of3 Shirley Goll DDES/LUSD MS OAK-DE-0100 Steve Townsend DDES/LUSD MS OAK-DE-0100 Bruce Whittaker DDES/LUSD MS OAK-DE-0100 NOTE: If the Renton School District announces a district-wide school closure due to adverse weather conditions or similar area emergency, the proceeding on this matter will be postponed. Parties of record will be notified of the time and date of the rescheduled proceeding. Any questions regarding postponements aud rescheduling can be directed to the Hearing Examiner's Office at (206) 296-4660. Sign language and communication material in alternate formats can be arranged given sufficient notice at PTD:ms L04P0002 NOT Attachment 296-1000 (TDD number 296-1024). ---••••• •••• •.:.:.:.• RULES OF PROCEDURE OF TIIE KING COUNTY HEARING EXAMINER Rule VIII. PRE-HEARING CONFERENCES A. Purpose and Initiation Pre-hearing conferences promote efficient case management by providing an infonnal process for early identification of issues and resolution of procedural matters in complex cases. Evidence generally will not be received at a pre-hearing conference, except when required in order for the examiner to rule on a motion. (Pre-marking and introduction of exhibits to which there is no objection may occur at the discretion of the examiner.) The examiner, on motion of any party or upon his/her own motion, may convene a pre-hearing conference to: I. Identify, clarify, limit or simplify issues. 2. Hear and consider pre-hearing motions. 3. Schedule hearings, identify parties and witnesses, determine the order of and limits upon testimony, obtain stipulations as to facts and law, identify and admit exhibits, order discovery, and consider and act upon any other matter which may aid in the efficient disposition of the hearing. B. Requests for Conference A motion to convene a pre-hearing conference shall be made to the examiner as soon as the need for a conference is recognized by the moving party (at least 21 days prior to the scheduled hearing date), and shall state the reasons for the request, including any motions to be presented. For good cause stated in the motion, the examiner may consider a request that fails to meet the 21-day requirement. For hearings authorized under KCC 20.24.080, a motion by any party for a pre-hearing conference shall be granted if timely. However, unless consented to by all parties or otherwise ordered for good cause by the examiner, no pre-hearing conference on an appea] can be convened later than 45 days after receipt of the statement of appeal by the hearing examiner's office. C. Proceedings at Conference A party who has received timely notice of a pre-hearing conference shall identify at the conference any pre-hearing motions not previously made which he/she intends to make. Parties or interested persons may also file timely written pre-hearing motions for consideration at the pre-hearing conference. Failure to make or disclose a motion which was available to the party at the time of the conference may be grounds for its denial if subsequently made. D. Pre-hearing Order Following a pre-hearing conference, the examiner shall issue an order specifying all items determined at the conference. The order shall be binding upon all parties and interested persons who received timely notice of the conference. Revised March 31, 1995 DIRECTIONS TO ODES HEARING ROOM 900 OAKESDALE AVE SW, RENTON SOUTHBOUND 1-5 EXIT l 57 -Martin Luther King Way Tum RIGHT onto 68"' Ave. S. 68'' Ave. S becomes MONSTER RD. SW Monster Rd. turns into OAKESDALE AVE SW DOES is on your left (building 900) NORTHBOUND 1-5 EXIT 154 to 1-405/WA-5!8/Burien/Renton Stay right to 1-405/Renton/Bellevue 1-405 EXIT I to WA-181/W. Valley Hwy_ LEFT onto W. Valley Hwy/SR 181 RIGHT onto East Grady Way LEFT onto Oakesdale Ave. SW ODES is on your right (building 900) NORTHBOUND SR 167 Northbound under the I -405 overpass LEFT at SW 7"' St (2"" light) LEFT onto Oakesdale Ave. SW DOES is on your left (building 900) ~------------·-· ------ SOUTHBOUND I-405 EXIT 2 to W A-167/Auburn/Rainier Ave. Follow to SR-167 (Valley Fwy.) north LEFT onto SW Grady Way RIGHT onto Oakesdale Ave. SW ODES is on your right (building 900) NORTHBOUND I-405 EXIT I to Interurban Ave. S/West Valley Hwy LEFT at light at r•mp bottom (north under 1-405) RIGHT onto SW Grady Way LEFT onto Oakesdale Ave. SW ODES is on your right (building 900) SW 1m STREET ---SW GRADY WAY. -£ s G:\work.ing\rv1isc\He-x\DDES directions.doc I Page I of3 Whittaker, Bruce From: Tibbits, Chad Sent: Monday, December 04, 2006 3:09 PM To: De-En Lang Cc: Claussen, Kimberly; Charles Spaeth; Whittaker, Bruce; Gillen, Nick; Langley, Kristen; Dinsmore, Lisa Subject: RE: Comments about Fleuve des Voiles Staff Report Please address these at the hearing. Thank you. From: De-En Lang [mailto:deenlang@yahoo.com] Sent: Monday, December 04, 2006 3:03 PM To: Tibbits, Chad Cc: Claussen, Kimberly; Charles Spaeth; Whittaker, Bruce; Gillen, Nick; Langley, Kristen; Dinsmore, Lisa Subject: RE: Comments about Fleuve des Voiles Staff Report Chad Most of these are "typos", wouldn't it be better for the staff to correct them rather than have the applicant or someone else "picking" on them in front of the Hearing Examiner? Thanks. De-En "Tibbits, Chad" <Chad.Tibbits@METROKC.GOV> wrote: Mr Spaeth, Please address these concerns in the public hearing. Thank you, Chad From: Charles Spaeth [[!!ailto:sshaffercorp@att.net] Sent: Monday, December 04, 2006 2:45 PM To: Tibbits, Chad Cc: De-En Lang Subject: Comments about Fleuve des Voiles Staff Report Chad, I have a few comments and/or requests for review or clarification on issues set forth in the Fleuve des Voiles staff report. I want to make sure I understand all aspects of the report, as well as make certain it does not contain inaccuracies. Please take a look at my comments and let me know how each can be addressed. I can be reached at 206-526-8481 if you have questions. 1. Page 3. E. Agencies Contacted: are Native American Tribes considered "Agencies?" The Muckelshoot Cultural Resources Program is not listed here as one of the agencies contacted. Nor is it mentioned on page 14 as having been sent a copy of this staff report. The MONS was issued on 11/9/06. The 21 day review period should have expired on 11/30/06, but the appeal deadline date was called out in the MONS as 12/4/06. We received the staff report--which stated that no appeals had been filed--on 12/1/06. You may need to check again for appeals tomorrow morning (I 2/5) and make corrections/clarifications at the hearing, if necessary. 2. VERY IMPORTANT: Page 5. H. Subdivision Design Features: 3. The second paragraph states: 12/06/2006 • "The applicant has proposed to transfer approximately 455 square feet of property to King County Parks in order to improve this intersection." Page 2 of3 This in not accurate. The plan is that King County Parks will transfer approximately _455 square feet ( or transfer right-of-way) to the Dept. of Transportation so that the north leg of the intersection may be built according to the intersection plan we submitted to DOES. In return, after recording the plat, the developer will transfer approximately 21,937 square feet of wetlands buffer (Tract A) to the Parks Department. We suggest the following change: "The applicant has proposed the transfer of approximately 21,937 square feet of property to King County Parks in exchange for 455 square feet of new right-of-way in order to improve the SE 192nd St./ I 24th Ave. SE intersection." 3. Page 9: Under Section 6: lettering of paragraphs needs revision. (There are two 'd's and no 'g.') 4. Page 10, Paragraph 11: I wish to confirm that the Sensitive Areas code reference here cited (K.C.C.2 lA.24) is that which was in effect prior to the adoption of the ordinance that went into effect January 2005. 5. Page 11, Paragraph 13. The first line of text reads: "Dedication ofa sensitive area tract/sensitive area and buffer conveys to the public a beneficial interest in the land within the tract/sensitive area and buffer." Notwithstanding this language, it must be made clear to all parties and the public that the developer intends to ultimately transfer the Tract A wetlands buffer (21,937 square feet) to the County Parks Department. (See item 2, above) 6. Page 13; Paragraph 19: Section 21A.38.230 (regarding tree retention) no longer exists in the cu1Tent code. I request that your office reviews this issue so that there is no doubt about whether the old code (no longer published or available on the County's website) or the new code will apply to this project. Please furnish me with a copy of Section 21A.38.230 if that is the code section you meant to cite. 7. Page 14: Please update the Parties of Record list to conform with that shown on the November 14, 2006 hearing notice issued by Peter T. Donahue (Hearing Examiner), which is identical to the list faxed to me by Shirley Goll on 12/4/06. If you agree with these comments, please make corrections/clarifications at the hearing. In any case, please advise me by email or phone (206-526-8481) prior to the hearing how you think it best to handle each of these issues. 13est regards, Charles Spaeth Ravenna Development -----Original Message----- From: Charles Spaeth [!'!l_ajlto:csh~ffercorp@_att.net] Sent: Friday, December 01 1 2006 4:35 PM To: Chad Tibbits Cc: De-En Lang Subject: Fleuve des Voiles Staff Report Chad, Jam in receipt of the recently issued staff report. Page 14 of that report contains a list of the parties to whom it was transmitted. This list differs from the list issued by the hearing examiner on November 14th announcing that the hearing would be on December 12. Page 2 of that hearing ex~aminer's notice lists the following names that do not am1eaco11 the staff report list De-En Lang* Muckleshoot Cult. Res. Mark Stevens Tim Wheeler 12/06/2006 ' Seattle KC Health Dept. Sean & Linda Warren Mark & Joice Wilson Lozier Homes, Corp. Charles Spaeth * Marvin Wehrman* Page 3 of 3 I happen to know that the names with stars next to them, even though they did not appear on the staff report list,~did receiveJhe staff n;p~. I do not know whether the non-starred names received the staff report. If the non-starred names did not receive it I request that it be mailed to them immediately. If you know that they were mailed the report, I request that the staff report list be amended to correct the record to show who, in fact, did receive the staff report. Next week I will be sending you a few comments having to do with the report's contents, but for now I just want to make sure no one has grounds to challenge the project because they were parties of record but were not sent the report. Your immediate attention to this matter is greatly appreciated. Please let me know what you learn and what action has been taken as a result of looking into this matter. Thanks very much. Best regards, Charles Spaeth 12/06/2006 .. Bruce Whittaker I 0/30/2006 Flueve Des Voiles L04P0002 Proposed Conditions 8. The drainage facilities shall meet the requirements of the 1998 King County Surface Water Design Manual(KCSWDM). The facilities shall meet the requirements for Level I Flow Control and Basic Water Quality menu in the KCSWDM. 9. A maintenance access easement to King County is required across Lot 2, for maintenance of the Tract B stormwater facility. I 0. A drainage conveyance pipe is required to allow for offsite stormwater conveyance, between Lots 13 and 14, in general conformance with the conceptual grading and drainage plan submitted. This pipe shall be sized appropriately, per the KCSWDM at engineering plan submittal. 11. The 100-year floodlplain for any onsite streams or wetlands shall be shown on the engineering plans and the final plat per Special Requirement 2 of the KCSWDM. 12. A drainage adjustment(L06V0040) is approved for this site. All conditions of approval for this adjustment shall be met prior to approval of the engineering plans. 13. The following road improvements are required to be constructed according to the 1993 King County Road Standards(KCRS): a. 124 th Ave SE and the internal loop road shall be improved at a minimum to the urban subaccess street standard. The stub road to the north, adjoining Lots 6, 7 and 8, shall also be improved at a minimum to the urban subaccess street standard. b. Tracts F and H shall be improved at a minimum as private access tracts per Section 2.09 of the KCRS. These tracts shall include curb and gutter section driveway entries. The private access tracts shall be owned and maintained by the lot owners served. Notes to this effect shall be shown on the engineering plans and the final plat. c. Modifications to the above road conditions may be considered according to the variance provisions in Section 1.08 of the KCRS. .•. Drainage Narrative The Flueve Des Voiles subdivision is located in the Upper Soos subbasin of the Soos Creek basin. The Fleuves des Voiles site is subject to the Level One flow control and Basic water quality requirements of the 1998 KCSWDM. An adjoining proposed short plat ( Cogger short plat L05S0040) is subject to the Conservation flow control and Basic water quality requirements of the 2005 KCSWDM. The proposed Cogger short plat is adjacent to the Fleuves des Voiles subdivision, along the south edge. The 8 lot, 0.93 acre Cogger short plat is also undergoing preliminary approval under LUSD file number L05S0040 The combined, irregularly-shaped sites slope moderately from west to east with the result that all predeveloped runoff sheetflows across the entire eastern property boundary. All of the site's runoff enters upper Soos Creek and it buffer area. Soos Creek then flows south under SE 192nd Street through a 48-inch culvert. Approximately 13 upstream acres are tributary to the two sites. The proposal is to collect most runoff from the combined project's site and direct it to an integrated detention and water quality facility located along the lower, eastern boundary of the site. The proposal is to also collect and treat entrance road improvements in cartridge filter treatment catch basins and release the flows along the northern portion of the SE 192nd Street right-of-way. As a result, predeveloped dispersed flows will be concentrated to two outlet locations. The allowed releases would then enter the Upper Soos Creek stream/wetland buffer. Concentrated outlets to a stream or wetland buffer are acceptable. A drainage adjustment(L06V0040) is approved for the Flueves des Voiles and the Cogger short plat sites. The adjustment allows the use of a shared storrnwater facility for both sites. The mixing of the two storm water detention requirements(Level I and Conservation) can be accomplished with the KCRTS Storrnwater design program. File Name: File No: .· Date - ACTIVITY LOG ' \l SOOS CREEK PLAT L04P0002 Staff Activity (Note names, type of contact,, issue,. resolution) . • . F90/Ac:Liv:l.ty.Loq July 9, 199l••-J:~6ea/di 0: w "' l: :, z w .J -u. w a 0 u 0 w ,., ~ s-9 .._S) I ® King County Department of Development and Environmental Services 000 Onkesdale A\·enue Sou 1 ii west Remon. \\'A 98055-1219 MEMORANDUM Date 3 · I · L/ f" f 8.0 Cl-I Ea'.. "2. • 2.(, . '-\ FROM: Site Investigator B f:TH CH ES.H I El<. TO: Engineer B@,uCE \JJl-f ITTAKEQ (KCLA) RE: Field Check Observations f. PROJECT NUMBER/ NAME LOY'POOO 2 / SOOS CREEK J Address I Location NE OF NE 192"'' ST !'<ND 12Y-nl AVE SE Related Project # / Name __.A'----"'0"'---"3'----P'-----'0"'----'2'"""'B'--Co=--------------- Thomas Map Page (new) (eP::fp f 2. Thomas Guide Page (old) _______ _ 2. SYNOPSIS OF PROPOSAL SuBD!V!'DE (o. ct Ac.QES [NT?) 35 LOTS FLOW CONTROL L tiDA 1 S LEVE LS 1 kND Z (s&1Sr]\/E SL.Q?E) ¢ WATER QUALITY BASIC 3. SIERRA FILE INFORMATION Parcel #(s) (..! 9900 02-Z.0, 021...\0. 02Co0 S-T-R SW 33, 23• 05 Kroll Map (p 05 vJ Acres / Feet2 Current Zoning I< -(o -SQ Community Plan SCDS C:12,ffK Comprehensive Plan __:U~M:....:_ ___________________ _ Limited Text Entry P:-suFPI X C..ONDID Dt-J$ l< C.C... -\ (e . B '2... • I 50 D $ c. -P~, so · 2 2.0 I ,It PEl2 Ai=>Pl-K/11-.l-f". SITE" \ S A Pol2T""l01'.l OF 7, 7 "l AC 12.E<.;.. PAGE I 4. SENSITIVE AREAS INFORMATION MAP FOLIO PAGE# SITECONTAJNS SJTE ABl/TS YES HO YES HO COMMENTS •Wetlands O [RI ~ 0 SrYIALL ON-Sr[£ WEI A12E7IS. 5 2. KED1vrVI Sl2.E'O VvETfti2~ ALC:t·H=t WEsr e:::6€' Wetland#YD Wetland Class .1 fJrainage Basin -------- Sub Basin 5005 Cf?E'EK Critical Basin? [I] [ID • Streams D [i{') l2CJ D SCOS CQEEl(_ '->J tO:tJN Wt;ITl./tND Stream Class Stream Name • I 00-year Floodplain _0 o_o D • Erosion Hazard --~ O_IZJ D • Landslide Hazard _0 [&J_O IBl • Seismic Hazard __ 0 (lg_IB) D • Coal Mine Hazard _0 IRJ __ o ~ • Other known SA's _[Xl O_IBJ D Class I or 2 Stream or Class I Wetland within one mile downstream of project site/ _....YJ_..E~S=------ SO(:l s C\2EFK /sut2f?,Q..J~Oit:,,lo Ult?D!s:NO tsD {AQ2JC FEMA FIRM number _______________ In FEMA Floodplain/ [I] ffiJ Soils Mapped ' As B. A3 D Map# _L.J,_ __ _ Best available Topographical Map C nY OF g \3.JltN I • ~ 2CO' l I S6 S S, SITE DESCRIPTION MATCHES T.I.R. DESCRIPTION! T1-IE Sr'fE IS MAi)E U? CF 2C...OMl?L-l?fE Pl'.D?,CELS /\ND A pqgn 01'-1 o'F A 3~0 . THE £As18?-N PA12CEJ I$ 'THE LQw EST. A Bur 5 ;xx::::,;s Cf2.t?&'.: W:ED/5lJ OS , 1 5 ACCE;S'S 8D • BY A 0@\/EL @S£HWt 'A;(gc:,5§. TB£. PAi2C£1,.. D-?~ $OUCH, CON12\J N $ ;;i A-12fA5, cf: '31 tfg§? SLC(.:)5(eoru PAGE 2 <5. EXISTING SITE FEATURES Un~apped Sensitive Areas: SMALL A:52-QIS OF WET /sA'TUl2(n"E'D zhJP Pr. LSO SD::t=: P Sl ,4?E S Soils types seen and evidence of soil movement, slides, slumps, erosion, or deposition: ------ b,H) '?OIL-MW:eM:a.ff ~ I C-UT.S ~ 1b BE MA:N-1::'.JAJ:F Ground Cover: 'Bl..Acx..~,f,121\S.5?:::,, f:~S. ,5"<1.-A:l-1 cefuotu E:i.(2./Q?E COfil2)JWXO cEO,'<g, 13,if;, IM:f t!Af?Z, A:1D£l2, /Jl=Ylil'..t., Ag_ ' Existing Utilities (hydrants, signs, poles, etc.) shown on site plan? Y£S -1:,JQ:f ALL d;;S IN 1J:I: E Qw\ E:: LocA:P;nU . aJ 0\ ff£/2J-;nJ[ Hts:PS Wildlife and habitats: :=:,q.,)(;, 'Bl@ S SH AU.. Hfn\/\lV! E'.\..'S • Re:e::R ) WaterWells: MPn2.\l£0 at-) StTE: Pt-tctJ -LQcfsTI)r0 tJOT: COJSJS'Ilt:VJL Work started on site? 1]2A-C[Qf< PA:D:Js/e,12.VSftBD ~AI..QNb t;AsT: SIDE:. r . Closed depression >5000 .feet'? [!] 00 Steep slopes? © [[] ------------ 7. DRAINAGE Drainage complaint records ------------------------ Proposal will add >SOOOft' of new impervious surface? ['i'] l1il Approximate Area ______ _ Proposal will collect and concentrate surface and storm water runoff from an upland and site drainage area of over 5000 fc'? {I] l1il Approximate Area ______ _ ' Upland Drainage Basin (draining directly onto site): M(JS( Of -n-lE uPL/SND BAsiN IS f2.DJT'?D OOQ..Jf\.Q SJ'fE VIA TIPo JI) 1J::IE: NE CO@JeJZ. ( D11Z.tj) A:NO GP1SQS10C Ol1l..\:'J f's\..O~ 121ST PL SE 3-5 ACl?-ES Fl,owS. 'Dl@Bl..tLY Ot0TQ 1lt£" S1'f"E': n?OM JJ:±12 WEST- On-site Drainage: '.:::, I TE SLoPE'S fu_\O 'Qe./Q t\.lS \;:A$T 'TD TM E g7\'S113DVt-J0A-e..':l'. MJO 11-1~ Downstream Drainage (minimum 1/4 mile distance): Jl::)E tJIAJOl2 (C:( OF r:tl E 3 ITE P?!S][\.\ 5 DI f?:R.'.fl. y \ !:JID I}:\:!;:::' $00$ C/2.RE);:'.., W\?11-/s:ND AND 10 scos (QEFX,, \µ\tlC~ :EL.ovJ'S Sot.JTH uNDEl2. SE lC)'Z-ND st Ql\J WE~ s,os: Of TI:\E WITTJ...:MID. SoME: of D::\~ Stlli C'2/n1'.I.S ID JljS PAf'CfL AQll'CaJ( W Tl--\ E" SOJn-1 CF TI:\ E ~ P~C£1,.. '8,~ E;NT!?(2.1 /0 bi ::TJrl r W1?1]....M)C). Drainage Description Matches T.I.R.? 6PJ,Jr.J?A:1,Y YE.:'$ $OH£ 'R;:gnO\)S, OF Tl IZ N2t LI N lrmj CC:JWAJSH.J t:i t::f'( Po s "Y j p A GE 3 ------· ----- 8. EXISTING ROAD NETWORK On-site Roads 0112.A\/EL gol'f[) !2.EU2![l.,Y U)\~ ALOt:JEa Aa/2.ss 112Acr TD -srTE . AdjacentRoads '$E 192.ND ST ;;).&:: PA:\/EP w 1' Ac \.liAWl\t-JGi Pl'rrl:/ ALOt--1~ tvO!?JJ:\ sr OE" (Psl-Gt,.16 s,ov:tH ACLESS 'TD s.rri::) I z.yn-t A\/E '$£" (PA'1ED,/IM02-DJ1,~i:>) 0eo:CS SQtJll-l v\sX: COZ.NBZ.. OF ACQ3S. Closest Transit Stop ---------------------- 8. ESTIMATE OF PROJECT IMPACTS OH SOIL AND WATER 9. ADDITIONAL COMMENTS srrE DEsctG1PDaJ cosr... HAs A 1::tt:iosE L61s1?-A0E. i :lliAI fn2. £ N QT uJ tD:\ l bJ TI:\ E '.Fl2d?C5ED S IIE. Il/E KND NOT£ utAT ~ VlA:P f:\AS '.Dtf1-1?BJT L.!XkJJd\J \ "-I fO :1JtJsN <fl)ft?bet;fill' n AP • s,·F?J:;P SLOPE '1]2.ACT$" f)o ~or /<;PPJ:?st'.-JD fu J [] u filB'f4? S..AxS cu. MfrP Nv0 J\J TI a.D PAGE 4 10 CONSTRUCTION SIGNS WITHIN 500 FEET AND ADJACENT USE NOJ2Il:I -WOODED Pl\12CEJ S / WE,11,,tn,.lD CMNtvEL i EAST -SOOS Ci2-EE):'.:. WB'fU'i}JD / C)2.e:E]l.. I Sovn:J -SF LOTS WEST -SF LOTS 11 NUMBER OF PHOTOGRAPHS TAKEN S O!<J\JE , CO'lOITlO"-l'S, LV'S D, PRQJEZ.-T RioTDS, LOY POOO 2. PA G £ 5 ATTACHMENT TO MEMORANDUM PROJECT NUMBER: FIELD/OFFICE SKETCH WORK: Drainage systems, features, channels within the upland site plan areas, on the development site, and in the downstream receiving areas: Ill 1/l 1.i) ~ g N - ::;:~s~e:J:i,s~e~'l">i~}sci:,==Bb!Z•m©---7 4 0 p,-r(1-\ '1 ) 1 .... ~ a ~ i) ~J= 0 ~J-0 ~ J ~o SKETCHED BY: Notes:---------------------------- SC ALE I"=---- 0 PA GE 6 Monday, Feb 23, 2004 07:58 AM BD09 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11260-Sl REAL PROPERTY CHARACTERISTICS 02/18/04 10:37:19.2 ACCOUNT: 619900-0220-0 SITUS: 12208 SE 192ND ST 98055 TAXPAYER: RITZ JANIE L QSTR: SW 33 23 05 LOT: 11 BLK: PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 (SEE ALSO 8 SPLIT) JURS: KING CO * LAND ZONE ACTUAL DATA. I KING co II 2.54 WATER SYSTEM WTR DIST I ** BUILDING BLDG SQ FOOTAGE DATA DAT A * • BLDG 1 OF 1 * * JURISDICTION ACRES SEWER VIEW OPEN SPACE TIDELANDS WATERFRONT FEET WFT LOCATION WFT BANK FIRST FLOOR 1430 1/2 FLOOR 2ND FLOOR PRIVATE 1 1 UPPER FLOOR NO TOTAL BSMT I FIN BSMT I BSMT GARAGE 1430 320 450 Il l TOTAL LIVING AREA 1750 ATTACHED GARAGE ROOMS MISC BLDG INFO YEAR BUILT #STORIES #LIVING UNITS DAYLIGHT BSMT HEAT SOURCE HEAT SYSTEM ACCESSORY IMPS POOL AREA POOL CONSTR DET GARAGE AREA CARPORT AREA WFT RIGHTS ONLY I BEDROOMS 3 MOBILE HOME ================================================================= ( 1965 1. 0 1 OIL FR AIR 670 470 0. 1) == BD09 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11280-Sl REAL PROPERTY LEGAL DESCRIPTION 02/18/04 10:37:25.2 ACCOUNT: 619900-0220-0 SITUS: 12208 SE 192ND ST 98055 TAXPAYER: RITZ JANIE L QSTR: SW 33 23 05 (SEE ALSO 8 SPLIT) JURS: KING CO LEGAL DESCRIPTION -PAGE 1 LOT 11 BLOCK PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 NORTHWESTERN GARDEN TRS DIV #5 NO 388021 RECORDING DAF -TRACT 11 OF NORTHWESTERN S 240 FT OF LOT 1 OF KC SHORT NO 8404200923 UNDER RCW 84.36.381 THRU .389 * END OF LEGAL DESCRIPTION* LOT 2 OF KC SHORT PLAT NO 8902210370 SD SHORT PLAT GARDEN TRACTS DIV NO 5 TGW PLAT NO 582064 RECORDING TAXABLE PORTION PARTIALLY EXEMPT 0 .1) ====-========================================================================== CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, <ENTER> FOR MORE LEGALS, <PF2> FOR CHARACTERISTICS, <PF6> FOR HISTORY, <PF7> FOR TAXES OR <PF8> TO END. BD09 ACCOUNT: KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11270-Sl TAXPAYER: LOT: 11 619900-0220-0 RITZ JANIE L BLK: .(SEE ALSO 8 SPLIT) REAL PROPERTY HISTORY 02/18/04 10:38:55.7 SITUS: 12208 SE 192ND ST 98055 QSTR: SW 33 23 05 PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 JURS : KING CO * A S S E S S E D V A L U E H I S T O R Y * * S AL DATE 12/93 08/89 E S H I S T O R Y * YEAR LAND IMPS DATE REASON 04 47,900 73,600 07/03 REVALUE 03 47,900 73,600 09/02 REVALUE 02 47,900 73,600 07/01 REVALUE 01 47,900 73,600 05/00 REVALUE 00 47,900 73,600 08/99 REVALUE 99 47,900 73,600 10/98 REVALUE 99 47,000 78,000 04/98 EXTENSION 98 47,900 73,600 11/97 S.C. FROZEN V 98 47,000 78,000 09/97 REVALUE 97 47,900 73,600 11/96 S.C. FROZEN V 97 47,900 73,600 09/96 REVALUE SALES PRICE REMARKS QCD QCD * *.* CONTINUED * * * * END OF SALES HISTORY * ================================================================= ( 0.2) -- * A s s E S s E D VALUE H I ST 0 Ry *I* S A L E S H I s T O R Y * YEAR LAND IMPS DATE REASON I DATE SALES PRICE REMARKS 95 47,900 73,600 10/94 REVALUE I 12/93 QCD 93 69,300 73,600 04/92 SEGREGATION I 08/89 QCD 93 117,000 73,600 03/92 REVALUE I 92 40,350 73,600 04/92 SEGREGATION I 91 68,000 73,600 06/90 REVALUE I 90 39,700 63,600 09/89 MAINTENANCE 90 51,200 63,600 03/89 SEGREGATION I 89 51,200 63,600 03/89 SEGREGATION I 89 58,700 63,600 04/88 MERGER I 89 49,500 63,600 01/88 REVALUE I 88 58,700 60,500 04/88 MERGER I * * * CONTINUED * * * I * END OF SALES HISTORY * ------==============================================-------------( 5. 0) CHOOSE ONE OPTTON· * A S S E S S E D pf;IJO'.~C ...-OOT't..T'T'..._ .,.,r, nnT'L1:l"f'I ,:,,....nr:1~1• S A~~ .. yt) -,r :r--g-~-CfFY-* V A L U E H I S T O R Y u IMPS DATE REASON DATE SALES PRICE REMARKS YEAR LAND 87 85 83 49,500 43,500 43,500 60 500 07/86 REVALUE 12/93 QCD 55:900 04/84 REVALUE 08/89 QCD 55,900 05/82 REVALUE * END OF VALUE HISTORY * * END OF SALES HISTORY * BD09 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11260-Sl REAL PROPERTY CHARACTERISTICS 02/18/04 10:39:44.2 ACCOUNT: 619900-0240-0 SITUS: 12216 SE 192ND ST 98055 TAXPAYER: THOMPSON JAMES LEEROY+JUDIT QSTR: SW 33 23 05 LOT: 12 BLK: PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 JURS: KING CO * LAND DATA* I ZONE ACTUAL KING co I ACRES 1 96 I WATER SYSTEM WTR DIST II * * B u r L D r N G BLDG SQ FOOTAGE DATA FIRST FLOOR DAT A * * BLDG 1 OF 1 * * MISC BLDG INFO JURISDICTION 1/2 FLOOR 2ND FLOOR SEWER UPPER FLOOR VIEW OPEN SPACE TIDELANDS WATERFRONT FEET WFT LOCATION WFT BANK NO I TOTAL BSMT I FIN BSMT I BSMT GARAGE II RO T0 0 MTALS LIVING AREA ATTACHED GARAGE 720 720 720 720 YEAR BUILT #STORIES #LIVING UNITS DAYLIGHT BSMT HEAT SOURCE HEAT SYSTEM ACCESSORY IMPS POOL AREA POOL CONSTR DET GARAGE AREA CARPORT AREA WFT RIGHTS ONLY I BEDROOMS 2 MOBILE HOME ================================================================= ( CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, 1987 1. 0 1 YES ELEC ELEC BB 0. 0) == <PF4> FOR LEGAL, <PF6> FOR HISTORY, <PF7> FOR TAXES OR <PF8> TO END. BD09 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11280-Sl REAL PROPERTY LEGAL DESCRIPTION 02/18/04 10:39:49.9 ACCOUNT: 619900-0240-0 SITUS: 12216 SE 192ND ST 98055 TAXPAYER: THOMPSON JAMES LEEROY+JUDIT QSTR: SW 33 23 05 JURS: KING CO LEGAL DESCRIPTION -PAGE 1 LOT 12 BLOCK NORTHWESTERN GARDEN TRS DIV# 5 300 FT TH NELY PLW S LN 135 FT TH TO POB * END OF LEGAL DESCRIPTION* PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 LESS POR BEG SW COR TH N ALG W LN S PLW W LN 300 FT TH WLY ALG S LN 0.0) =============================================================================== CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, <ENTER> FOR MORE LEGALS, <PF2> FOR CHARACTERISTICS, <PF6> FOR HISTORY, <PF7> FOR TAXES OR <PF8> TO END. BD09 ACCOUNT: TAXPAYER: LOT: 12 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11270-Sl REAL PROPERTY HISTORY 02/18/04 10:40:25.4 619900-0240-0 SITUS: 12216 SE 192ND ST 98055 THOMPSON JAMES LEEROY+JUDIT QSTR: SW 33 23 05 BLK: PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 JURS : KING CO • ASSESSED VALUE HISTORY *I* s AL I DATE E S H I S T O R Y * YEAR 04 03 02 01 00 99 99 98 97 95 93 LAND 131,000 126,000 120,000 115,000 88,000 83,000 76,000 76,000 76,000 76,000 70,700 * * * IMPS 88,000 81,000 74,000 58,000 58,000 43,000 40,000 40,000 37,900 37,900 43,200 CONTINUED DATE 07/03 09/02 07/01 05/00 08/99 10/98 04/98 09/97 09/96 10/94 03/92 * * * REASON REVALUE REVALUE REVALUE REVALUE REVALUE REVALUE EXTENSION REVALUE REVALUE REVALUE REVALUE SALES PRICE REMARKS I 05/88 35,000 DEED I I I I I I I * END OF SALES HISTORY • BD09 KING COUNTY DEPT OF ASSESSMENTS BDOl PAI11270-Sl REAL PROPERTY HISTORY 02/18/04 10:40:29.5 ACCOUNT: 619900-0240-0 SITUS: 12216 SE 192ND ST 98055 TAXPAYER: THOMPSON JAMES LEEROY+JUDIT QSTR: SW 33 23 05 LOT: 12 BLK: PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 * A s s YEAR 92 91 91 89 89 87 85 83 E S S ED VAL U E H LAND IMPS DATE 41,100 43,200 09/91 41,100 43,200 09/91 41,100 59,600 06/90 29,300 31,700 07/88 29,300 01/88 27,900 07/86 24,000 04/84 24,000 05/82 ISTORY REASON BOARD EXTENSI JULY BOARD OR REVALUE MAINTENANCE REVALUE REVALUE REVALUE REVALUE *l*SAL I DATE I 05/00 I I I I I I I I I JURS: KING CO E S H I S T O R Y * SALES PRICE REMARKS 35,000 DEED * END OF VALUE HISTORY * I * END OF SALES HISTORY • ============================================--------======-------( 4.5) == CHOOSE ONE OPTION: PRESS <PRINT, TO PRINT SCREEN, <PF2> FOR CHARACTERISTICS, <PF4, FOR LEGAL, <PF7> FOR TAXES OR <PF8> TO END. 'BD09 KING COUNTY DEPT OF ASSESSMENTS REAL PROPERTY CHARACTERISTICS BDOl PAI11260-Sl 02/18/04 10:41:02.9 SITUS: ACCOUNT: 619900-0260-0 TAXPAYER: B & J IPL LC LOT: 13 BLK: QSTR: SW 33 23 05 PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 • L A N D D A T A * I * * B U I L D I N G BLDG SQ FOOTAGE DATA FIRST FLOOR ZONE ACTUAL JURISDICTION ACRES WATER SYSTEM KING CO 3.30 WTR DIST 1/2 FLOOR 2ND FLOOR I I UPPER FLOOR SEWER VIEW NO I TOTAL BSMT OPEN SPACE TIDELANDS WATERFRONT FEET WFT LOCATION WFT BANK I I FIN BSMT BSMT GARAGE TOTAL LIVING AREA I ATTACHED GARAGE I ROOMS JURS: KING CO DAT A * * BLDG OF MISC BLDG INFO YEAR BUILT #STORIES #LIVING UNITS DAYLIGHT BSMT HEAT SOURCE HEAT SYSTEM ACCESSORY IMPS POOL AREA POOL CONSTR DET GARAGE AREA CARPORT AREA WFT RIGHTS ONLY I BEDROOMS MOBILE HOME • • =====================-==========================-================ { n 1) == BD09 KING COUNTY DEPT OF ASSESSMENTS REAL PROPERTY LEGAL DESCRIPTION ACCOUNT: 619900-0260-0 TAXPAYER: B & J IPL LC LEGAL DESCRIPTION -PAGE 1 SITUS: BDOl PAI11280-S1 02/18/04 10:41:09.1 QSTR: SW 33 23 05 JURS : KING CO LOT 13 BLOCK PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 NORTHWESTERN GARDEN TRS DIV# 5 LOT 1 KC SHORT PLAT #278113 REC AF #7807281028 * END OF LEGAL DESCRIPTION * 0. 0) CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, <ENTER> FOR MORE LEGALS, <PF2> FOR CHARACTERISTICS, <PF6> FOR HISTORY, <PF7> FOR TAXES OR <PF8> TO END. BD09 KING COUNTY DEPT OF ASSESSMENTS REAL PROPERTY HISTORY BDOl PAI11270-Sl 02/18/04 10:42:03.6 ACCOUNT: 619900-0260-0 TAXPAYER: B & J IPL LC LOT: 13 BLK: SITUS: QSTR: SW 33 23 05 PLAT: NORTHWESTERN GARDEN TRACTS DIV NO. 05 JURS : KING CO • A S S E S S E D VALUE H I S T O R Y DATE REASON 07/03 REVALUE 09/02 REVALUE 07/01 MAINTENANCE *l*SAL I DATE E S HISTORY* YEAR 04 03 02 02 01 01 00 99 99 98 97 LAND 93,000 90,000 86,000 82,500 82,500 175,000 94,000 88,000 80,000 80,000 80,800 IMPS 06/01 06/01 05/00 CORRECTION BO CORRECTION BO REVALUE 08/99 REVALUE 10/98 REVALUE 04/98 EXTENSION 09/97 REVALUE 09/96 REVALUE I 06/03 I 01/02 I SALES PRICE REMARKS 260,000 DEED QCD * * * CONTINUED * * * * END OF SALES HISTORY * =====================================================-=========== ( 0.3) CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, <ENTER> FOR MORE HISTORY, ~PF?~ FOR CHARACTERISTICS, <PF4> FOR LEGAL, <PF7> FOR TAXES OR <PF8> TO END. BD09 ACCOUNT: TAXPAYER: LOT: 13 • A s s YEAR 95 93 91 89 87 85 85 84 83 83 KING COUNTY DEPT OF ASSESSMENTS REAL PROPERTY HISTORY BDOl PAI11270-Sl 02/18/04 10:42:09.7 619900-0260-0 B & J IP L L C BLK: SITUS: PLAT: NORTHWESTERN GARDEN QSTR: SW 33 23 05 TRACTS DIV NO. 05 JURS: KING CO E S S E D VALUE HISTORY * * S A L DATE 06/03 01/02 E S H I S T O R Y • SALES PRICE REMARKS 260,000 DEED LAND 80,800 81,900 47,600 37,800 37,800 40,300 47,000 40,300 40,300 47,000 IMPS DATE 10/94 03/92 06/90 01/88 07/86 07/84 04/84 07/84 08/84 05/82 REASON REVALUE REVALUE REVALUE REVALUE REVALUE JULY BOARD REVALUE JULY BOARD JULY BOARD REVALUE QCD OR OR OR * END OF VALUE HISTORY * * END OF SALES HISTORY * ================================================================= ( 6.4) CHOOSE ONE OPTION: PRESS <PRINT> TO PRINT SCREEN, <PF2> FOR CHARACTERISTICS, <PF4> FOR LEGAL, <PF7> FOR TAXES OR <PF8> TO END. Parcel Number: 6199000260 Taxpayer. REL ESTATE PROPERTIES LLC Annexation: NIA Jurisdiction: Unincorporated King County Situs Address: Postal City: Renton, 98058 Plat Name: NORTHWESTERN GARDEN TRACTS I Rec: nil Lot: 13; Block: NIA Kroll Page: 605 W Thomas Bros. Page: 686 1/4-S-T-R: SW-33-23-5 Acres: 3.30 (143748 SqFt.) Current Zoning: R-6-SO Potential Zoning: Comp. Plan Land Use: um Assessor's Open Space: NIA Commercial Use: N/A Number of Units: NIA Mobile Home: N Appraised Land Value: 93000 (2004), 90000 (2003) Appraised Improvements Value: O (2004), O (2003) Community Plan Area: Soos Creek Unincorporated Area Council: NIA School District: Renton School District 403 Fire District: 40 Roads MPS Zone: 342 ($3730.00) Waterfront: Water Service: Water Service Planning Area: Soos Creek Water And Sewer District Sewer Service: Airport Noise Remedy Program: N/A Bald Eagle Flag: NIA Council District (1996-2001): 9 Kent Pullen (R) Council District (2002): 5 Dwight Pelz Drainage Basin: Soos Creek, WRIA 9 Police: King County, Pct: 3, Dist: F3 Service/Finance Strategy Area: Full Service Snowload Zone: Standard Agricultural Production District: N Forest Production District: N Rural Forest Focus Area: N TDR Type: N/A TDR Status: NIA TDR Permit Number: N/A ------------ Building Inspection Area: Cleo Rubalcaba Clearing Inspection Area: Jim Ballweber Code Enforcement Inspection Area: Sheryl Lux ESA Inspection Area: Kathy Newborn Grading Inspection Area: Ramon Locsin Land Use Inspection Area: Tenzing Thinley ------- Sens. Areas Notice(s) on Title: Parcel Number. 6199000240 Taxpayer. THOMPSON JAMES LEEROY+JUDIT Annexation: NIA Jurisdiction: Unincorporated King County S~us Address: 12216 SE 192ND ST Postal City: Renton, 98058 -------- Plat Name: NORTHWESTERN GARDEN TRACTS Rec:nil Lot: 12; Block: NIA Kroll Page: 605 W Thomas Bros. Page: 686 1/4-S-T-R: SW-33-23-5 Acres: 1.96 (85377 SqFt.) Current Zoning: R-6-SO Potential Zoning: Comp. Plan Land Use: um Assessor's Open Space: N/A Commercial Use: N/A Number of Units: N/A Mobile Home: N Appraised Land Value: 131000 (2004), 126000 (200 Appraised Improvements Value: 88000 (2004 ), 81 OC ------------- Community Plan Area: Soos Creek Unincorporated Area Council: NIA School District: Renton School District 403 Fire District: 40 Roads MPS Zone: 342 ($3730.00) Waterfront: Water Service: Water Service Planning Area: Soos Creek Water And Sewer District Sewer Service: Airport Noise Remedy Program: N/A Bald Eagle Flag: N/A Council District (1996-2001): 9 Kent Pullen (R) Council District (2002): 5 Dwight Pelz Drainage Basin: Soos Creek, WRIA 9 Police: King County, Pct: 3, Dist: F3 Service/Finance Strategy Area: Full Service Snowload Zone: Standard Agricultural Production District: N Forest Production District: N Rural Forest Focus Area: N TDR Type: N/A TDR Status: NIA TDR Permit Number: N/A --------------- Building Inspection Area: Cleo Rubalcaba Clearing Inspection Area: Jim Ballweber Code Enforcement Inspection Area: Sheryl Lux ESA Inspection Area: Kathy Newborn Grading Inspection Area: Ramon Locsin Land Use Inspection Area: Tenzing Thinley -------. Sens. Areas Notice(s) on Title: Parcel Number: 6199000220 Taxpayer. RITZ JANIE L Annexation: NIA Jurisdiction: Unincorporated King County Situs Address: 12208 SE 192ND ST Postal City: Renton, 98058 Plat Name: NORTHWESTERN GARDEN TRACTS DIV NO. 0 Rec: nil Lot: 11; Block: NIA Kroll Page: 605 W Thomas Bros. Page: 686 1/4-S-T-R: SW-33-23-5 Acres: 2.53 (110419 SqFt.) -------- Current Zoning: R-6-SO Potential Zoning: Comp. Plan Land Use: um Assessor's Open Space: N/A Commercial Use: N/A Number of Un~: N/A Mobile Home: N Appraised Land Value: 92400 (2004), 72600 (2004), 89000 (2003), 70000 (20( Appraised Improvements Value: 171000 (2004), 0 (2004), 158000 (2003), 0 (2 Community Plan Area: Soos Creek Unincorporated Area Council: N/A School District: Renton School District 403 Fire District: 40 Roads MPS Zone: 342 ($3730.00) Waterfront: Water Service: Water Service Planning Area: Soos Creek Water And Sewer District Sewer Service: Airport Noise Remedy Program: N/A Bald Eagle Flag: N/A Council District (1996-2001): 9 Kent Pullen (R) Council District (2002): 5 Dwight Pelz Drainage Basin: Soos Creek, WRIA 9 Police: King County, Pct: 3, Dist: F3 Service/Finance Strategy Area: Full Service Snowload Zone: Standard Agricultural Production District: N Forest Production District: N Rural Forest Focus Area: N TDR Type: N/A TDR Status: NIA TDR Permit Number. N/A --·-· Building Inspection Area: Cleo Rubalcaba Clearing Inspection Area: Jim Ballweber Code Enforcement Inspection Area: Sheryl .Lux ESA Inspection Area'. Kathy Newborn Grading Inspection Area: Ramon Locsin Land Use Inspection Area: Tenzing Thinley ----- Sens. Areas Notice(s) on Tille: soc Page I of I @)Kine County IIICllllllll ._4i4HAW Comments Miiiii,M Development Condition Query Results - Parcel Search Parcel Number: 6199000220 Parcel Number: 6199000240 Parcel Number: 6199000260 Listed below are both Post-Conversion and Pre-Conversion development conditions which are associated with the parcel you entered. To view text for a development condition, choose a condition code in either box below and click on a Get Text button. Otherwise click on 'New Query' at the bottom of this page to perform another parcel search. Post-Conversion Conditions Pre-Conversion Conditions (Effective August 18, 1997) (Prior to August 18, 1997) KCC-16.82. 1500 ; SCP-P17 SC-P3 SCP-P3 S0-220 SCP-P4 SCP-P7 •.. -- Updated: December 29, 1998 King County I DOES Page I DDES/GIS Page I New Query I News I Services I Comments I Search Links to external sites do not constitute endorsements by King County. By visiting this and other King County web pages, you expressly agree to be bound by tenns and conditions of the site. Ibe __ d_e_t_aJIJ_. .., .., -• • .., • --• -., -:z:-SEE 68 7 KA.P l.. C;) p'300G, " ~ 3S ~VONG>! t:I t; ~t;; .... t;; V") "' !i1 .., ~ 1:! i;;: t;; H.181>I ~ s ~; "' ~ ~. ~ .;: LO ~,,f, ~~. ' 'I, ! , ' ~ 1 ~-~·:V-'·'>:g; --...: . -' . ,.,. I _.,/ / I I \ \ \ J ' I \ \ I I I I I / I \, ---1) 1, ,-~~ ~ ________ .) '!i '< ., ~,,,,., .... -;.. .... ''::. :::.::.::.::. ·:;:. ·;.:~,.,. ) ·-~ .,, '!~ X I \ I I I I I " ,, (__~ i''-. ---' / I , I ' •' <.• / ~ c::::::i::- .. ,t !! ~ / + L04P0002 SOOS CREEK ARTERIALS /\./ To,omshlpLlnes S-T-R /'\ / 1 OSLINES I • '/:'v. SEQ.IN ES N TWPLINES J'v Sireets Wale< Bodies Parcels Cities f'va1yBouooat1eS o 1000 2000 3000 4000 Feet 1 "= 3333 feet ® King County Tht lnforffllllon Included on !nit map hat Deen cornpilled by King eo...,ry staff from • 'lan.ly of ao..iroes and It 11..Cject to CNf'09 'MthOUI rodce l(jng Couriy makH no ------------t---------------~.J~~=:.=~~=:%1~u..·:.1: IUCh Nl\'O'rnotkln. KlfG Coorty thlll no( be Hable for 1rry OM'«al. aplcial. V'ldlrect. k'c~II. or oomequenti.t damages indudi(G, bul nol lin'lte4 '°· k,M. revetlJH 0( k>tl P'()fits r--..1ino lrom SM u• or rrituN: of l hl iN'ormatJOn (ll)fUined on ttu map Nrtf sale of tlw mllP or inb'maOon on nu map ia P'ohlbited exoe pt by written P4"'"'9Sioli or Kl Cou .. y Plot date: Feb 26, 2004; \\cldes0011x01'Qls\av_dev\pl'OjectS\base2.apr L04P0002 SOOS CREEK 2000 PHOT O , . I \ I QSUNES I " N sECUNES N TWPLINES N Streets Water Bodies Parcels Aerial Photos -2000 100 1"• 200 feet 200 Feet @ Ki ng County The Wo,mation included on this map hM: bNn ~ by King County at.ff from a variery of scx.roes .-'Id it abject to d"Larv-: witt-o.Jt rotlce. King Couriy makes no ,.)7'tl98ntations or warrarites. express 0t ln"pted, as IO Iha ,a;uracy, ~!eness. hmeUness, °' nghtt to the use of auch 1nformall0n. King County 9he1l not be J~ for any ge,..,-al, special, irdlrect. ircidenlal, or COnseqv&(iial damages indud1rQ, but nol llmled lo. lost reveN.les 0< lost protils N&Jting from the UN or rruuee of tt'e lrtormat,on contained on this map. Ariy te6e of thi:8 map 0< loformallon on ll'is map Is prohibded except byvmtten pe,rmisslon of Kl C.ourty. L04P0002 SOOS CREEK 1996 ORTHO 0 Water Bodies Parcels Olles 100 200 1 "s :JOO feet :JOO Feet ® King County The tnl'ormation 1n:::tuded on this map has been ~ed Dy King County staff lrom • vl!riety of 80l..l'CeS rid ., su:i;eet to ct,qe without notice. Kmg CountymakM no n,preeenlation11 or warranliea. 9)1.pr9AI or ~ied. as IO 1he aoc1.ncy. ~1-neas. timelinna, °' rights lo the u,e of euch information K.w,,g Col.uty 1hlill noC be li#M lot aft/ genertil. ti:,.ci,i, Indirect lne.identll, cw consequential d~• ndudl~. bul nol lll'Tited to . lost revenues o, ~ ?'ofil:a realJllng frQrn tht, UN or rTHUM of It'll irt0ffll3Clon oonta:Md on thil maip. Ally MM of Ihm map or iitormation on 1tvs map Is prohi'bltltd u cepl by wrilten ptm'liasion or .... , County. Plot elate: Feb 16, 2004; l \ddes0011x01'Qts\av_~oj8CIS1base2.apr LAT L04P0002 SOOS CREEK 2000 PHOTO , . , ' ' QSUNES JV s ECUNES N TWPUNES N s1reets wat&r Bodies Parcels Aerial Photos -2000 N City Boundalles Cities 0 100 200 1"• 300 feet 300 Feet ® King County The inlormalJOn 1f"duded on this map has bNn oompled by King County ttaff lrom a variety of IOISCeS and ii 9'..t)jrec1 to ct\llf'fve withOut notice. King C.OUnly ffl81ke s no l'llpre,enlations°'wwranlies, •x.preu or i~led. as IO the eccu'-=\', compl•t•r-.u. tiffllfineN, Ot rights lO the U:9e 01 ~h infcwmatk>n. King Couny ahll1 no1 ~ liablti fOt' any gt,,..ral, special, lric:snct, l~ldenlal, « con:9eqUeflllal damage, indudir-.;i, but rw:,t lirm.:! to, lo:M revenues°' m! p-di111 re.Ullng from the uw er rTUUN of the lrtorrnatlon corta.ned on this map. Any •• of this map or inlOO'T\llltx:m on lhlt map !S P"Ohlbl1ed u.cept by written permission of Ki Cot,rly. Plot date: Feb 18, 2004: l ldd8s0011x01'<)1s\av_d evlprojects\base2.apr LAT L04P0002 SOOS CREEK HYDRO&GEO TopoC4 5 ~'foo N Flsh and Ditch oata Bald Eagle Nests N T r,,,nst;p Lines §••WildllfeNetwon< Basins .R '\/QSUNES ~SECLINES N'TWPLJNES N Streets ~ftream ~2P N 2S i'v'3 ,' \.I u !S:"'!SAOWettand [21 SAO Landslide HB SAO Coal Mine ISJ SAO Seismic C] SAO Erosion Water Bodies o WLRO Drainage complaints Parcels ~ Par~~ 1 Eagle Habitat WDFW2 OR TREES1 WDFW2 OR TREES3 TREES2 N a1y Boonda~es N Fe.!A Cross Sections E!3 FEMAFlooo,,'ay 0 FEMA 100-yr. Floodplain aues 0 500 1000 Feet 1"• 1000 feet ® King County The Wormation inctuded on thll map hat been C001)11ed by King Cotxlty staff from a vwty of ,ou-ce, end 19 tll.JbJect to CN,..,e 'Mthout notice. King Coorty makes no rep-eeentations or wa,rantlee. express or implied, as kl lhe eccxa,cy, oon,:,lelotness, llmelinns, or rights to the I.die of lk.lCh Information. K,ng Cou<'lty ,twl nol be lllble lor any Qel"IO(al. special. indlreci. lncider181. °' coneequerc.-1 damage, lrdodll"Q, but not limited k>, lost IWvenu&t Of k>st profit• resulting from the uee « mi8U98 of the ktormatlon oonlaii.ned on this map. Any Nie of thie maip or information -::-'I on 11,,. rn,.p It ?"()hi)ited except by written permission of Kirc;1 Courly LAT - L04P0002 SOOS CREEK HYORO&GEO TopoC4 5 ~'foo N Fish and Ditch Data Bald Eagle Nests N •ONOSNP Lines ~ •• Wildlife Nelv.ork Basins -R • ,"QSUNES ~SECLINES N TWPLiNES N Streets ~ftream 1'J.2P ~2S i'.v'3 /,1 u ~SAOWetland [21 SAO Landslide IHI SAO COOi Mine ISi SAO seismic CJ SAO Erosion Water Bodies CJ WLRD Drainage Complaints Parcels Parcels near Eagle Habita1 ~ WDFW1 WOFW2 OR ffiEES1 WOFW2 OR TREES3 TREES2 N Oty Boundaries NFEMA Cross Sections CJ FEMA FloodNay CJ FEMA 100-yr. Floodplain Otles 0 500 1000 1"= 1333 feet ® King COUnty 1500 Feet The WCl'mation lrdvded on this map has been oompied by King c.ounty staff from a variety of XMXCfl: and is ~ lo CM~ IIMlhOul notice. King Couriy maJ(et no ,-,:rnentaUons « wmrartits, txptess Of !"l>I*', as to tr. aoe11acy, ~tentu, llmeUntu. or riQhtt 10 h u,e of aJCh rlforrnation. King County shell not be II~ for arry ~ ~ ~~~~i:~~r:~·k)~k)C::Zs~ork)sl J)l'dtts ruiJtlng 1l'om the usie or mlsute of !he lr1onnat ion contained on this map. Arry sale of tht9 rr.ap or W\lormatlon on thle map ls prohl)lt.; except by written permlMlon ot K11 Cour<y. LAT -I i' - r I j i 1r- L_ ~ J _ _Jl_ _l qu10 j ' I : I I ' ~--,---------\ ! J -l I ---I.. Q?Un-ct,.J i:r ; \ J--, l : ·r; 1------t l ~ .I.---- I/~ I ~ I I ~~ !I! / 1 LB· !Ir ~ ,·~~r L 1 J . _) .-I -f :_ I---ii L04P0002 ' 1 SOOS CREEK /1 N T<:,Nnshl p Lines S.T-R /\/OSLINES @.SECUNES N TWPLINES N Streets Water Bodies Parcels N aty Bouooanes CiUes Bogs §~ ., 1 1 1 r2I Sole Source AQuifer Area Specific Water Quality Req,irements Basic WO Treatment Areas (TA) • S8ns1Uve La ke TA • Regionally Significan1 Stream TA Basln-v.ide Wat8' Quality Requirements D BaslcWQTA CJ sensauve Lake TA 0 400 Feet 1"= SOOfeet @ King County The Information included on this map has been ~ed by King County slaff from a variety ot sources IWld is llllqeci lo change 'Nilhout notice. King Court.y maJtes no repreisentallone or warTartle ,. elCPfeU °' IMP:ied, a 10 the e,:;o.n,cy. ~lene". llmel lneu. or rightt to the U88 of 9UCh Information. King eou,ty shall not be I~ for •"t general . spectal, indlNtci. lncidertel. or eonsequenlllll damages indl.lding, but not llmted ~. lost reveni..s or k>st P'()fits reSUting from lhe use « misuse of the lrlormation contained on this rn,p. Arry sale of this map or lrtorrnation on tt,111 ffl81P Cl ?"Ohl>lted except by v,,fflten permits Ion of to"" County Plot date: Feb 26, 2004: \\ddes0011x01~islav_dev\projects\base2.a pr ,, /1lr-1 I I I I rr---ir1-n I\ l_Ji ~ '~~ T [-----------, L04P0002 SOOS CREEK 1998 MANUAL N Tc1Nnshlp Lines J I S-T-R '' /OSLINES ~SECUNES '/\/TWPllNES N Streets Water Bodies Parcels N Oty Boundaries OHes Sensitive Slope Leve 2 Areas Q OA a::::J ERS Landslide Hazard Level 2 Areas DA LND Ii Area Specific Flow Control RequirefTIElrlts Level 1 FC Area • Level 2 FC Area • Level 3 FC Area Basin-v.ide FiaN Con trol RequirefTIElrlts 0 Level 1 FC Area CJ Level 2 FC Area 0 400 Feet ! t·= 500 feet (® King County The information !!'duded on thls map has been COl'Tl)iled by King County slaff1rom a variel y of »ouroH and Is Sltject IO cha~• wllhOut notice King Courty makes no reprHentalJOns Of Wll'TeriiH, express or ~led. as IO lhe 1 accuracy. compielenH:1, llmeUntss, « nghl s to the uN of ,.. -u::h iiformatlon. King Couity shell not ~ Hable fot any Qtn&rel. special, indirect, !nc:kltria', or oon,equenllal damaQ6' lncfudi!"IQ, bUI nol lltnlled to, lost revenues or k>st profits ruUtlng from the u• « rri'4.19e of the irlormalion oonteined on ttus map. Arry Nie of tm map or information on this map is prohl:)ited excep1 by 'Mitten permission of Kl Coor<y Plot date: Feb 26. 2004; l\ddes001\x0 1\Jls\aV_devvolectslbase2.a p, I~! I Rl&.so ' I I I ! '\ -.... \/ __ .....___.-. ··--·---------------- ~t_~ . l ' ,A ' ,.,,. L04P0002 SOOS CREEK /,v•r,,,;ts ! SchoolS/School Facilities N T<>NOSt.p Lines S-T·R ',,'OSUNES f.Y. SECLINES W TWPLINES N Streets Water Bodlas Road Rights-of-Way Seattle Publ ic Utility Rights-of-Way Parcels C]Parl<s Cities zont'f 10-Agncutural, one OU per 10 acres • A-35 • Agr1culturat, one OU per 35 aaas -F-Fo-est M-Mlneral RA-2 .5. Rlral Area, one OU per 5 acres RA-5 • Rural Area, one OU per 5 acres RA-10 . Rural Area. one OU per 10 acres UR • Urban Reserve, one OU per 5 aaes R-1 • Residefltlal, one OU per acre R-4 . Residential, 4 OU per acre R-6 • Residential, 6 OU per acre R-8 • Residential, 8 OU per acre R-12 . Residential, 12 OU per acre R-18 -Residential, 18 ou per acre • R-24 • Residential, 24 OU per acre -R-48 • Resldentlal, 48 OU per acre NB • Neighbolhood Business • ~:~~,~~ness •0 -0ffice I -Industrial NCity Boundanes 0 500 1000 Feet 1"= 1000 feet ® King County -•--------------~ The tnforma!ion inctuded on this map has bMn compied by King County s i.tf trom a variety of 90ll"Cfl and ti ~I to charge ~thout rotice. King CoYniy makes no ,.p-eeel'Qhont or Wlff•niles. IIJCpr9N Of irll'lt9d . as to the IIIXJ.Xf/11:'j, ~,teneu. ltmelineu. or rights to the u,e of 9UCh nformtfion. K,ng County shell not be tillble ror ar,; 99,...,al, apecial, lridirect, incideri..i , Of COrmtquenl:tal Umeges irduding , but not limited to , loSI ,. .... rue. Of k)st p-of1ta realting from the UN or milUM of lhl tri'Offl\81:ion contained on this map. Afr'/ ute of lh1a map or i,forrn,,tl)n on this map is pr~ited ex~t by 1Mit1en perm aeion of King County Flot date: Feb 26, 2004; \lddes0011x01~1s\av_dev\projectslbase2.apr • • • ... ··--. • • • • • • • ··. u·: ... . . · . • • .· ~ .··. . . .. IJ}.-: • • • • fi'; ·~~ ·~~-Y"· .}..~ .,_ ·• .-: • ··"' .... • • • • ~gC • • • • • • • • • • • ••• • • • • • • • . ,_-...... • '~~-. • • • • • • • • • AgB " • • • •• •• • •• • • • • •••• • • • . ,. • • • •• • • • • • . -. • • • • • , .. ~ • -. • • • • AgC \ • \ .......... . ':, \ I .... -------.J..\ I I \\ 10-.~ ~ \I I-~· l~ • \.-·, ~ \\~· AgO e I • • Eva A " i· .: ~ --~z t.--;_ -I -- V\..,1 l.1 L V_..., ['fc- \ t----;3;,;00:;;-------.---~81:.:;8:..::.Sc;-I ----·-r----,.,-------...l , ~ 218.51 74.53 ,, \ I l,6 11 11 ,_ '} '----- 188TH I 4.41 ~~ ::! /'2 .. C'. w (/) 13'%'/ ] 'M t, ~' ~~ ?• L1 1-1 14 .73 • 1.J J ·-------- ·-,_I --' .., U\ 7.24 <t- ~ ll) (I) in 3 8 "' Cl) ,i, Cl) "' '-:1-l E: :) r:J ~ iii C) "' ' 9 U)OODS 38!;.?.8 @ N ~ !::! ,,-5 \) y' ) \.-_) l ·GAR EN 17 .74 ~ S.P, 3fJQ'.>2.I ~NO. I I 12 D __) -:!7 6 75 SP 278113 \ t ( I ) .... $ ,4 ( 2 ) \ I INWHOLE 8 1NAL USE OR . 610W BtJILOING c:::J APPROX . STORIES (f::f HOUSE NUMBER l•f51J I 'EDBY LAW -RAILROAD I I I ' I !(, c® ' 0 ~ ' I I co "' (: • ,r I :: • I- ll I J. ... l 0 I 0 I i I Q -' ... ~ \ \ I \ \ \ ·. ''ii -~·' . . ' -. ...... . •• Q , . . I .. ~-··· L04P0002 001.jpg L04P0002 002.jpg L04P0002 003.jpg L04P0002 004.jpg L04P0002 005.jpg L04P0002 006.jpg L04P0002 007.jpg L04P0002 008.jpg L04P0002 009.jpg L04P0002 010.jpg L04P0002 011 .jpg L04P0002 012 .jpg L04P0002 013.jpg L04P0002 014.jpg L04P0002 015.jpg L04P0002 016.jpg L04P0002 017.jpg L04P0002 018.jpg L04P0002 019.jpg L04P0002 020.jpg • L04P0002 021 .jpg L04P0002 022 .jpg L04P0002 023.jpg L04P0002 024.jpg L04P0002 025.jpg L04P0002 026.jpg L04P0002 027.jpg L04P0002 028.jpg L04P0002 029.jpg L04P0002 030.jpg L04P0002 031 .jpg L04P0002 032 .jpg L04P0002 033.jpg L04P0002 034.jpg L04P0002 035.jpg L04P0002 036.jpg L04P0002 037.jpg L04P0002 038.jpg L04P0002 039.jpg L04P0002 040.jpg L04P0002 041 .jpg L04P0002 042.jpg L04P0002 043.jpg L04P0002 044.jpg L04P0002 045.jpg L04P0002 046.jpg L04P0002 047.jpg L04P0002 048.jpg L04P0002 049.jpg L04P0002 050.jpg L04P0002 051 .jpg L04P0002 052 .jpg L04P0002 053.jpg L04P0002 054 .jpg L04P0002 055.jpg L04P0002 056.jpg L04P0002 057.jpg L04P0002 058.jpg L04P0002 059.jpg L04P0002 060.jpg L04P0002 061 .jpg L04P0002 062 .jpg L04P0002 063.jpg L04P0002 064.jpg , • .., • .. #1,J I, ..U.. T, ~ fl' ..4._ IHO RT KI NO PLAT COUNTY, WASHINOTON .. .. 1 .. "' &: ... i il! fhl• •P•~Q r•••rved for r•~ord•r'• u•• 1 ,• •.. ---......, I l }il :: I ,, ' : ,, ,. ~ ... j ll.J.:J rtl•d for ,.,..,,d ,t the req UIII t of' 1uh; +, ro,d~; o g Return tor Buitding & Land DeveZopment 450 KC Administration Bldg Seattle, Washington 98104 APPAOYAL DeP4rt.,.nt of li~flllJng •nd r.ommunJev DeveJopment luJJdJng ,nd L.lhi l,,.•vrJop"'4nt DJvJ1Jon IH&Jn•d .,,4 •pproved thJ• .g.tf d•v of /l.. '·t.:;tl:. ~. ~:I/ , u.._;;""'"'I' __ t ,,,z:.-11., ,,, 4/ 4-~cl--.n H•n•11•r, Bu.tJd.tng , L.nd O.veJopawnt bJvUlon ""- Dep.rt11Wnt of PubJi c Work.• £x4mJr.od ,nd ,pproved thi• I// cuv of .,.;,''Ii( /),,' , ; I JP~ .....----~J -,,../~-;'IJ1..._!;.....· '_· ---'ILIH DJ rector J f ·,) · 1 / .:::i ;/ 0() Vttpdrtn.cnt of Asses•ments £x•11Lin11d and •pproved th.is / )- _ ___;_,4.:....::-u.:..:<" ... ·.::u...;:.s;.:? _________ : ::ij ffe~t.Er/ /-/. /~.-P/E DESCRIPTION Deputy Assessor OZ,(>O sw 3.3 ·-13 ·S(l.1'1'/oo -02,1,t oz&~ LEGAL Tract 13, Nortbwaatarn Garden Tracts, Diviaion •5, according to the plat recorded in Volume 47 of Plata, page 90 in King County, Washington, SUB..JBCT to1 Agreements between owner• and King County Water District #58, Auditor'• f'-la #761260085 and # 741290026. StlB,1BC't <'01 An easement for Covington-Seattle Powerline, Auditor's #3178820 SUBJECT to: An easement tor electric transmission lines. Auditor's #6313654 SUBJECT to: An easement tor Roadray affecting the East 30' of Said Tract 13, Auditor's lf7403180427 TOOETHER WITH1 An easement for roadray and utility purposes over the Bast 30' ot the South 300' ot aaid Tract 12, Northweatern Garden Tracts, Division #5, according to the plat recorded in Volume 47 of Plats, page 90 ·.n King County, Waabington, Auditor,s number 780B090S99. Lot 11 Beginning at a point 298' north from the southeast corner of Tract 13, thence Wast 120' on a line at t"ight angles to the east line ot said Tract 13, thence South 1001 on_ a line parallel with the east side of said Tract 13, thence Wast 521 on a line at right angle• to the east side ot said Tract 13, thence South BB' on a line parallel with the east side ot aaid Tract 13, thence West 143 1 ! to a point 7 1 fromthe weat aide of said Tract 13, thence south 170' on a line parallel with the west side of aaid Tract 13, thence Southwest 7't along the southerly side of said Tract 13. to the aouthweat corner of said Tract 13, thence North 697.43 1 along the west aide of said Tract 13, thence East 276,75' along the north side ot said Tract 13, thence Southeast 168.13' along the Seattle-Covington Tranamision line right of way, thence. South 176.52' along tho east aide of said Tract 13 to the point of beginning. SUBJECT to: An easement for roadway and utility purposH over the east 30 1 a: s;-j.d· lot. 11. 'eas=t to he designated as '.l'ract~ A -'>. A.or. also, Map on FIie In Vaull P• ,e l of .1i:._ .. . ' .. . (, ?At 1 conti!U"d ioar&THIR WlfHI an ea, .. ent for ,,,.dwav ind utilitv pu~,•~ over th• ea,t 301 ot the louth 300' of Tract 1:1Jo•,14iJ !hrt'n"Ottern l\iri."t:n Traot.~.) oa r...::ccdod in lluditor 11 File~. 7808090599, Lot a1 Beginning at a point 298 1 north frOfl the 1outhe11t corner of Tr•nt 13, thence Weit 130 1 on a line at rioht anal•• to the •••t line of 11ia Tract 13, thence South 1001 on a line parallel with th• ea1t aide of ,aid Tract 13, thence Weit 53' on a line at richt anQl11 to the ea,t aide of 11id Tract 13, thence South aa• on a line parall0l with the oa1t 1ic!e of ,aid Tract 13, thane• Weit 143'! to a point 7 1 troa th• we1t 1ide ot 1aid Tract 13 1 thence South 170't on a line oarallel with the west aide ot said Tract 13, thence Ba1t on the ,outh eide ot 1aid Tract 13, to the 1outhea1t corner at 11id Tract 13 1 thence Horth 398' to the point of beginning, 10Cl&THBR WITH AND SUUECT toa an ...... ni for roadway and utility purpOHI over tbe east 30' of aaL:!. ~ l "I, easr""4"'lt to .he designa~ /IS Tract.I II -B, • • ...... ~-.: .. J AUG·28·16 Oot~ • l Serio\ No. J Receivin~,b~ .• :aassifimtic~ A~~ ......... ' ....... ~·· , ... ' .... ' '.'. .. , ... ,, ··············~·1·,~'····~·········· KING COUi\lTl RECORDS & ELECTIONt .. --... o; ,, -·; .. J Short l'l"t No,, ___________ _ ' • .. I • . . . "Air,.; Co'.lnty ha.1 no rea.11::1.f.'t>llJ.t·: to ~·JJ.ld, 1::.~ro•11, .:.1.1::-::.J.::, or ot~tl"dUt atrvJ.oo tr,t pr1va~o :oa-1, oor.t:i.J.r.td .,~ thin or prov1~1n~ aorv1c• to :ie pro~ar:y '1100:i~td 1n :~1,~.ort ;li:, r m:,7 -2 I I \ TRACT 12 I I l I TRACT13 LOTI 12000' I I . . --/ I ~-$·~lt ,-·, I I \i ~~~~ I' II 11 1-cr.: ~_:_._.i.:1,2,lll.L.,__...J , 35 'Radius -,.. ,., \~· Cul·da·sac ' / l'i g 'g\l' ,'' .. ~ g 81 1 1 LO T 2 f' . r<l l ', ~ :. ~' c; I I ,. 'J~~~:al:J7t;S·O!Sl.0:_..' --~1.54' t' / -.,~oo-_ _._---~.B-..I • -. --___.;;-----ii. • _ S E I 9 2nd SJ_ Y -"'• ,M./tr CV ..;N"t:. JJr, Z 1 ·S ::.V --------- Map on File in Vault N Dirl!ction: I Daphne A Ghan 2210 108t:. SE Bellevue, WA Scale,: 454-8658 ti I I I 0 so '"" ••o &00 Short Plat No, _ __.2=.:.7:B..I.l.:.I.::;'----- ... -: _,' .-. ',:··~··'-\ • .. . " COVENANTS, CONDfTfONS, AND IIESTRlCTfONS RVNIIJNO WfTII THE LA.~D: Tract(•) '\' , de111nated upon the plat a, a private road and thorou~nlare, i, d11crib1d in th• Kini County Comprehen• alv, plan a• a "local acco•• 1tr11dt or road" and in accordance •1th tbe 1t111dard1 th,rein, may be required for future County atreet, road, or thorou1hfar1, 1, The owner, hie 1rantee1 apf,•••icn•, hareby a1ree to dedicate Tract(s) to Kine County tor r1ght-ot-way and atreet purpose,, at auch time ae aaid Tract(e) ·~· is/are needed !pr those purposes, 'Xoee'd conveying TrAct(•) 'A to King County shall be executed--6-y--t~h-e~ owner, hie grantees and assigns, and shall be deli- vered to King County upon demand, 2, The owner, his grantees and assigns, hereby acree(s) to participate in, and/or not oppose or protest, the formation of a County Road Improvement District (CRID) pursuant to new 36.88 or any Road Improvement project sanctioned by King ,5.0,unty which is designed to improve Tract(s) and the invnediate street system o!""wli'ich it Is II part. Timing of the formation of said CRID or other road improvement project shall be determined by King County, The street improvement authorized by the CRID or other ro,a.d 1 improvement project shall call for the improvem~nt of Tract(s) A and its invnediate street system to at least the minimum King County road standards applicable to the CRID or other road project is formed; provided that, in situations where there is a multiple ownership of properties par- ticipating in the formation ot the CRID, or other road improvement project, it a majority of the property owners want a higher standard, i.e., curbs, gutters, underground drainage, etc., that standard shall prevail, _/µlet f }2J 1-:t -<-"5t Zt · R G 'I s R \ .\',.._ \ ,, '\:· C, Short Plat Number 2.78//$ Page L of S' I.,; • ' .. -1, ' .. DECL.\R.\T lo:i: • • • Know All 1110n bl' tho10 pro1onu ti.At we, the undel'llii;n11d, owner(•) in !oo 1implo I nnd coutrne~ ~ur~ha.sor(~)I ot tha lnnd heruin do1eribod do hureby mllke a ,hort eubdi\·ilion thoroor puuunnt to nc:, GS .17 .OGO 11nd declare thie 1hon plu.t to be the i:ra.phic roprt'11onta.t1on ot IIIUIIO, :1.nd that 1Aid short 1ubd1v111on ie ma.do with tho frcu consent :md in accorda.nce with the desire of tho owner(,), ln wltne11 whoroot we hnve set our hands 11.nd sea.ls, 1/'1 . ? ·/st... fr:, ,_, I, Name \','). ' SO ,, Name No.me Name STATE OF lfAS!!lNGTON,!· ... Countv of ,.~,0 ,. On SJi.t day .P•rsor.allv •nured before me ---'}"'!e"'l"'v'-'i,.n.....,R.,,,_·.,.:/h.._1 .. t.,e..__...::an;;.d;;... _____ _ "e,rl S ::r:::: '::hite to mo .'<nown to be the ind.i.vi.dual descr.i.bed .l.n and who executee,~fil w.i.thi.n and foregoing instrument, and acknc-.. ledged that they si.gned the same as :11:hf,tz free and voluntary act And dead, lo: th~ uses llnd pu.rposes t:harein menttonsd. L I'.'! VEN under mv hand and offi.c: i.•l seal thi.s ...l..Ot.l> da11 of , pr', ,l9 __:za. 'f': ··1 -L . , .. ./: • ·1\ 1•01 ; ' STATE OF WAS!!I:·jGTON,( i ss. counev of _____ _ ,! A it.. ,i_.., ~-L.· ,.., >-... ?::Y&~,. .,;... Not~ry l'ubli'c in and for the State of Wuhi.rrgton, resi. di.ng at on thi.s da,; ,PersonallW B.P;eared before me ------------------- to ma kncwn eo h~ the indivldual described in and who executed the within and foregoing .inst.rurr.~ne, and A.:k."1owledr:;ed th.1t sig;2ed the sazre as free and voluntary ----•cc and deed, :or the uses and purposes therein mentioned. GIVE:! uncer mJ h~nd am! cfffi.cial seal thi.s _ a.av of -------' l9 __ • Short I'l:i.: ~:ur.ibcr ~78//.,3 Not~r; l'ubli.c i:n and for the State or fiashingeon, rcsid.inr; at: NO TH r-··,.,..,. ~--· ... \ v,.. ~ 'J 11,, (JS:-:,------. .. \ f' ~, ICALl 1 1" a .lilQ..! .' -r-• r" I I") ~ • 1• o ) 0 • • • I !~.J-i. \._ I I ~ ... • ' I . I I " I LoT+ ,',,,-?. 00 'I 14.,,3:.e,O:,::O_~._.------f~ -; - I ~ I~ .... • • '· II l , . " LoT !, I • . LEGAL DESCRIPTION --------------------- LOT 1 Tract 13, Horthwestern Garden Tracts, Division #5, Volume 47, Page 90 Record of Plats, King County, Washington. Exceptin9 therefrom the East 143' of the Hest 150' of the South 17~' as measured along the \-lest line, and excepting therefrom the South 198' lying East of the West ,~~· and the East 120' of the North 11)0' of the South 29S!' all as measured along the East line. Subject-to an easement for roadway and utilities over the East 30' thereof. ANO TOGETHER with an easement for roadway and utilities over the East 30' of Lot 2 described herein. LOT 2 -That portion of Tract 13, Northwestern Garden Tracts, Division f5, Volume 47, Page 90, Record of Platsi Kfnq County, Washington, described as follows: • The East 143' of the Hest 150' of the south 17n' as measured along the West line; and the South 198' lylnq East of the ~est 150' thereof and the East 120' of the North 100' of the South 29~' all as measured alon" the East line. Subject to an easement for roadway and ut111ty purposes over the East 30' thereof. \ • r•v1610N DAIC t 1 \ '{: Ji---. ----·-----::-:~7'.-::~---... ?, 1'14.~,4 • \ 'l'lt,(/S' I ' -, ' ,,,...--'' _/'"~·· . 1101\TN ICAL11 t'a~ -r-'r. I ,.,_\ • .,.') ~\.' ' -' ~--··-·· t----,;-.,1,:,;. 4'.0 .' • ., I I , ,....g. • ., I • •j-I i ... ,, " ,. -r· I f .... , .... ft l,,,, I ' I I •• • • I ::, 5Zt " I Q.l Q) • • • • • '" . gi ,~,4~:3~,0-0_~ •I I . " ~l ·: Lor 2 if I I I~ ' . ' I' ,t ', I O,o So-V4-~oiz. -----· A- ; LEGAL DESCRIPTION --------------------------- LOT 1 Tract 13~ Northwestern Garden Tracts, Division #5, Volume 47, Page 90 Record of Plats, King County, Washin~ton. Exceptin~ therefrom the East 143' of the liest ISO' of the South 170' as measured along the Hest line, and excepting therefrom the South 198' lying East of the West 150' and the ·East 120' of the tlorth llJO' of the South 291!' all as measured along the-East line. Subject to an easement for roadway and utilities over . the East 30' thereof. AND TOGETHER with an easement for roadway and utilities over the East 30' of Lot 2 described herein. . LOT 2 That portion of Tract 13, Northwestern Garden Tracts, Division #5, -Volume 47, Pag~ 90, Record of Plats, Kinq County, Washington, described as follows: ·· The East 143' of the 1-lest 150' of the South 17n' as m~asured along the West line; and the South 198' lyinn East of the Yest 150' thereof and the East 120' of the North 100' of the South 291!' all as measured alono the East line. S"bject to an easement for roadway and utility purposes over the East 30' thereof. l'or a 'laluable CODlldaraUon, re.~ of whlcb III bffltlJ aclmoWledpd, UM oramor! •••••••••• , .Qn.1.at.l'J..t1.tl1Sl.'.!tl>h.lr, • .U1,_..llb.Jdft • .Md.RAll.lrl..A •• f.4UOl.•nd.Oa.u.cud. ••••••• -~1.J:!t.YY.1.J1\1.Jd..(1 •• J;.qoi.J:Aiit.P.lltG~I •••••••..•.•••••.•••..••••.••..••..•.•••••.••• hereby srazi.t.l ••• ..and CODff)'.f •••• to the Grantee 'lalri.A.Jl •• i011tt.And.f.Mrl.Jl....While,.ble wit t h.t\r •• aucce11on and Pl!lp, the rl&ht, prh1Jesi and author1t7 to collltnlct, Improve, repair and maintain •• .M.t1M1111ru....tor • .m1~.,ru1.uU.lit1.PJlcpoAU •••••••••••••••••••••••••••• acroa,, over and upon the tonowm, land, located 1n ••••••••••••••••••• K1nG •••••• CouJ1t7, State of Wullillitml, to-wit: The Baet 30 1 ot th• South 3001 ot Tract 12, NorthwHt Garden Tracts Divleion #5, according to the Plat recorded in Volm,a 47 ot Plata, Paga 90 King County, Washington. · The OrantorJL. ahall make no uao of the land occupied by aald.. • .Rttnmt.r9Ad ...••.• _ .• except for. !I.S!,~~!'Y..J!.l!sl •• llt UJ.U .P.IU:ROtJ!Jl --• ·--· -------• ·----• --•• _ •• -·· -• ___ ••• _ ••••• -·. ·-------------------------------------------------------------------------------------------- In exerelaing the rights herein granted, the orantee_11_..thn.i: &ucceasors and B.BBigns, may pus and repau over aald..llll!'lf/OL.!or_m1,1wrut_•rul.utilltlr.p1u:posu.._ •.•••.• _ •••••••••••• may cut and remove brush, trees and other obstructlorui which 1D the opinion of tht Grantee.a. •• In- . terfere wlth •••••• Rsllld1f~A"JUll• ••••• --.~ •• ··--··--·-· -· -··----·---. ·-----·· .. ---------·-· -·-··---- The covenauta herelD contained shall run with the land and are binding upon all &ubaequent owners thereof. 'l'lle-'-llae-c>f «Id .................. ------_ ---. --. -_ ---.. llladl-0&-~~ ,w,ilh,-end not mue-\ban ···-·····-··· ---···-feehlbta1L•-.l-'llt-114e.t.,-,. .. pllR~-eut.er-YM,-aald land, flu-v,,,e0 r/,-bY flv .?1, /f!ez..e I lt/ /),C-. #O 'I ?o ro rorry '