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HomeMy WebLinkAboutMisc. ,,,,, ·., APPROVALS: DEPARlMENT OF ASSESSMENTS RECORDING NO. VOL/PAGE -~ SflORT.PLAT NO. L04S0037 -~,:KING ~_()UNTY, WASHINGTON DEPARlWENT Of OEVEl..OPMENT AND DMRONMENTAL &\'ICES EXAMINED AND APPROvW THIS..l!:aDAY Of ::S•/1".,. ,2062 Q e '2:?:J-·~- EXAMINED AND APPROVED ll·HS~DAY Ofrf~'m.t.20.o.J_ Su±\ fJo\&\r J.3;)../oo9 SCALE, 1 INCH "" 20 FT. -·-· _.:.-.--..Af'W USE ~S DIVISION 1~ DIRECTOR, LAl'W USE SERfl - ASSE~ 1,,0 4(/'\ 0 10 20 40 60 • EXAMINED ~~Ova) lHrs.tlfitiAY Of t2,,tombv'204 PORTION OF DEPUTY ASSESSOR -.--~/ .. ,.-.. AC~~:. EVIDENCE";~~~ . .:: SIGNED TMIS DEOICATltiN-~D A!l(f.101\\.E~ IT TO Bf{(HIS/HER}-.'FREE ::.~~~r'.ARY ACT mf lHE.'"OSES AND·;~RPOSES ~:~~~-IN TI--IE '''"'''.1ll•t11 ~ .,-...''\Ni:,,,,,. 1:-~',,,, -... _.. ...... ~,, .: , .;a,o,," o\ E_V"/,j-+O r,11' ~t.'g~ -UEc.; ..<. "';:,c:::; i,l-. -. -"]"'ff ::;;,i,: . ~/;' ,(, ~;;z;.= \~nl-,;1 ~,-i,.{~-t,,,~~~~,\:fl." ~,- 111;1, •• ,, ·:. DAlID SIGIA.TURE Of NOTARY PUBLIC PRINTED NAME Ol NOTARY PUBLIC 1.-. TITI.E Ami-or'( MY APPOl"'TMENT EXPIRES 6,/oild'I S"1E or 1.4./ 1 .·.·i··;, ... , .. ,,. COUNTYOf' /L1"-t. ·• ·::. I CERTIFY~ I KNO; ~V[ L.SfACT-,,NDENCE n,l~r .. conows ..,.,. ·. · .. SIGNED THIS OEDICATlOt{:1',No ACKNO~ IT TCl::BE (HIS,/HtR):fREE i:Ik.J~uN~:ARY ACT/OR lHE uses_,~ Pu~ MENTIONED ~ THE ~ ACCOUNT NUMBER QO 8 8 QO -0/ ?Q NE 1/4 Of THE NE 1/4 SEC. 29, TW. 23 N., RGE. 5 E., W.M. _... ..... , ........... ,,OEDICATION 'f<NQW;-~ PEOPLE BY~ PRESENTS THAT WE, THE UNDERSIGNED O\.'ttllER(S) OF INT£REST IN ,lttf'.t,.MIO HEREBY SHORT SUBDMDED, HEREBY DECLARE THIS SHORT PLAT 1(fBE THE GRAPHl(;.,R(ffi~l!Cij OF THE SHORT SU8D1VISION MADE HEREBY,'··-~~ 00 HEREB'i' DEDICATE TO Tit&·usr Of ntE PUBLIC FOR- E\1£R, AU. SlR(QS ~~-A~lJES NOT SHOWN £S PRl""'"lft.HE:REON AND DE- DICATE THE USE=-tli~i:IF:ftiR All. PUBUC f'WtPQSES.~OT INCONSISTDH WITH THE US1~:.1HE'f¢oF,F0R PUBLIC HIGHWA.'l'PlJRRJS£S..:00 ALSO-:~E RIGHT TO MAKE .fil ~S$1'RY St.OPES FOR ~rs ANO F1U$ UPON ™F LOTS SHO~ THEREbN IN THE=;.ORIGINAl REASONABLE·~G Of :SIJQ S.mtfTS AND AI/E- Nlll>S, AND FURTH~: DEOICA TE TO THE J;iSE OK~ lH[ PUai:lc· ).U. EASEi.CENTS ~ lRACTS SHO\litl ON THIS S>lORT ~T Fi;IR Ai:J;.P-IJBUC PURPOSES AS .·JND1CATEO THERJ;:!:JN, INCLUDINl).'81.JJ;lifoT IJMJTED TO ~S, OPEN SPACES, ·.• UTILITIES ANO DRAINAGE Utf\.ESS .Stlai EA'!hiiENTS QR'·.TRACTS ARE SPECIFlC- Al.l Y 1DEN11FJED ON THIS S130RT PUT .~s' BEING O~ATED OR CONVEYED TO A PERSON.CR ENTITY OTHER THAN 1W". PUBLIC. 1~."V,1·UCH CASE.YE··B&·~E- BY DEDICATE SUCH STR6ETS. EASEMENTS, OR TRAtTS TO '!HE' ~ERSON OR ·• •• ENTITY .IDOl11F1ED ANO"•tOR 1HE f'URPOSE STAJE'Q. • .. ~· FUR1HER. THE UNDfRSIGNED t;M,4ERs OF ltiE LAN1rHEREBY SHORT SU8- DIW;lto WAIVE Fo~:JHEMsaVES. THEIR HEIRS AND:ASSIGNS AND ~Y-P.~SON OR"OI-J1TY DERII/ING llllE FROM THE UNomsiGNr:;,: ANY AND ~-Cl..AIM3-'.fOR DAIIIAGES .. ,'iG"!~T KING ~NTY. ITS suct:EssQf?S ANO ASSI~ 'MilCH M~.Y BE OCCAS10Ne:O BY THE.£5TABUSHM00. COkS'J'Rl!CTIOH. M'MAIN1£NANCE °61:'· •• ROI.OS AND/OR DRAIN~ SYSm.tS_-jliin,ttN Tt!lS StlORT SU£1DIVISION OTHER .,, TI--IAN CUJMS RESULTING·FRc».!_ INM>EOOATE blAINTENANCE'·"BY KING COUNTY. FURTHER, THE UNDERSIGNID-fMNERS Of '.1HE LAND ti?.R£By SHORT SUB- Dl\otDED ACREE FOR THEMSO..VES, TliEJR HElifs .-.NO ASSIGNS,.10.~lfY AND HOt.D KING COUNTY, ITS SUCCESSORS AN!}. ASSIGNS. HARMLESS FRON .ANY DAMAGE. INCLUDING ANY COSTS CF DEFENSE, Cl:.AIMEO BY PERSOHS WITHIN._-OR WITHOUT THIS SHORT SUBDIVISION TO HAVE BEElf·-eAIJSED BY All'ERAllQMS. OF THE GROUND SURFACE, \IEGETATlON. DRAINAGE OR SliRfACE; OR SUff,-61..JRfACE •• WATER FLOWS 'MTHIN lHIS SHORT SUBDIVISION OR BY ESTABI.JstlMl:'.NT, CONST-::··· RUCTION OR MAINTENANCE Of THE ROADS WITHIN lHIS SHORT SUBDIVISION. ·'.·" ~=G :ii:;~~:ir~~=OR~~~J: !or~!~:~~;· ···:·-~f FROM THE NEQJGENCE OF KJNG COUNTY. ITS SOt::CESSORS OR ASSIGNS. LEGAL DESCRIPTION TRACT 5, BLOCK 3, AKER'S FARMS NO. 6, I.CCOO:DING TO THE PLAT THEREOF" RECORDED lN \la..UME 42 Of' PLATS, AT PAGE 1S. RECORDS Of' l<ING COUNTY. WASHINGTON. SUBJECT TO: THE RIGHT TO ENTER SAID PREMISES TO LW<E REPAIRS, ANO THE RIGHT TO CUT BRUSH AND TREES WHICH CONSTITIJTE A MENACE OR DANGER TO UTILITY LINES LOCATED ON PROPERTY ADJOINING SA.ID PREMISES. ,S GRANTED 8'r' INSTRUMENT RECORDED UNDER RECORDING NUMSER .!4-57064. AND; AN EASEMENT ANO THE TERMS ANO CONDITIONS THEREOF, UNOER RECORDING tfUMBrn 75021SDJ94, IN FA.VCR Of PUGET SOUND POWER & LIGHT COMPANY, A WASHINGTON CORPORATION. PERTAINING TO 3 GUY WIRES ~Cl 3 N-ICHORS (NOT SHOWN ON TMIS MAP). AND; Nj··t,,s~p,ff ANO THE TERMS AND ~bl[lJTIONS THEREOF. RECORclEli·~Y 3. 2007 UNDER RE;.COROfKG:Nl,JMBER 2007050J002(!i.'5, TO PUGET SOUt(O ENERGY,-:·foR ONE OR MORE •• • " • t111UTY SYSTU,lij';. 1 o fW tN Wt_Qti-! HAVING_.:.O FEET OF SUCH '. WIDtH ON EACH .... S!OE Of TI,IE. ct:NTERUNf.:J:lF GRANTEE·s SYSTEMS .... ,.,... ·-··--k~W>~TEf.:~~s~ 1i?~o.~~~~-~~~G BUILDING F001"1J.fos, FoutlO,l,,.noNS, ~/OR SUBSURFACE" STRUCTURES. •:(NOT SHOWN ON TMl~·.i1Af'). .. ._-/:· .-::·· THIS SUBDMSION, OCDICATION. WAl\£R Of Cl.AIMS ANO AGREEMENT TO .. :• . :·· 'i:I ··1 :· Ha.D HARMLESS IS MADE Wl'IH THE FREE CONSENT AND IN ACCORDANCE WITH ,,.•""''""',", DAW e .: l: ' TH[ DESRES Of SAID OWNERS. (<1.~~S . .'~~ ~i?:.:,4£;?~ ... · .. ff< '1TNESS V«= M: SET OOR HANDS AND srul> ~ .\f'. ,]•1, S1GNAlUR£ Of • • • • ,,,, -~lf6'.t.':/})~~ -~-';;~ . r. !J' : !J. ~ :Jt ~ { .:,; "t;~.=c.: ... JrAf 11 TLE, ~ ....... ,-···-:·\ ·:. cc ~eo,{ :nos «40 SC ~o ,'(/, 0, £~ MY""'°""':;;,;{. .·.fofoi[t>? ., "''" a."D ~"" FRANC<S ,uJ '•,,•~--sW""'~~-,...... ·-···'' :: .-:' .-, ~ ·····~t,· '4 l11h11~ .. ,. .., •••.• ,.,-• .• .:.: ••• J_.:z··· .. _-::··:·N .• E FR~l;m BAN , ~-. 1 REmfrNcE u{ NAD83 /91 SURVEY CONJBOL CITY Of RENTON SUR\£Y • .• •. CITY CF RENTON SURVEY CONTROi.. MONUMENT NO. 895 ·:·-~::· (NOT TO SCALE) CONTROl MOfiilUt.lENT NO. 164-0 FOUND "X" IN Y BRASS FOUND 4"X4" CONCRETE SURFACE M(XIIUMENT STAMPED MONUMENT WllH J" BRASS 'i"O'M-lSEND & ASSOC1A TES OISC WI TH PUNCH IN CASE 963-$", VISITED 30-0CT-2003 DOWN 1.2' VISl1ID 8/16/2005 SE 160TH ST. ~--· S88"'46·15"E_ (wees) _____ N8B'"4-6'45"w _ 2658.97. (209/2Jo)_T_ S88"45'0J"'E 2659.os· (M) -----~1 2SI 1925.85" (C) 7J.J.21' (C) ~8 ,, ..... , ....... ;:' ,;UR~'i:~;;;~·~Z,,.t;., ~~~. =MENTEO C:OHERUNE CF 114-lW:A'vOruE sci,lHEAST, PE.Ff· ~~~~rci:~~~S ~:; :~TS~ A~~,\ii STAT£ OF k/A: l 00..0HY Of ~ I ss I CERTIFY TI--IA;:; HA\JE SATIIACT~ EVIDENCE THAT el.S...illJ;. ·1-as...mc. N;1124-7.44-B, N: 11169.48 . ···:... E:9028.18 (1) AS PUBUSHED ON TI-IE V«x:S 'M'.BSfTE 6/7/07 Q, ~ ~ E:11686.61 ··:.:.-KJNG COUNTY (1) € l ~ u.i KING CO\INIX (1) :, .• ,, .... o.w,; nr .,. . ro fi SIGNED THIS DEDICATION ANO ON OATH STATED THAT (HE/SHE) Wl>S AUTHORIZED TO EXECUTE THE INSTRUMENT~o~ THE I &9clGiC OF u TO 8E THE F'R£E ANO VOWNTARY ACT OF SUCH PARTY FOR lHE USES ANO PURPOSES MENTIONED IN lHE INSTR\Jt.lENT. ~~,. . ~~;;~ • ...,,.I\ ~, f, '"'> ,., . \ ""~·· i PUBLIC l c~~ DA1ED .,, ... ~~ ~m~~~cn,t ::~ ~~cCFAOW! ~4t TITl£ ~~ MY APPOINTMENT ;;S 1::\18.l U, • ·ir:,:~~,:::D::m·=·:=~~:::::~SE IND~~- SUINl?l'·"MOOUMENTS OR .MARKERS SHOYIN HER£0N .v.tR£. ....,snm & _OBSERVED D~ING AUGUST 2fX!.t., •• , ••• :. . • J.) f]fl Q SJJIMY MfIHQPQ~G)'· AElD ME'ASUREMENTS fOR Titl5 SURVEY WERE PERFORM :USING I. 5-S(~ OR BETTEft. ELECTRONIC TOTAL STATION tR-~-WITH ACCEP.TED SURVEY PROCEDURES WHICH t.lEET. 00 ~ STATE :: •• ST.A.Nt».ROS AS SPECIFlED BY WAC-l:52-13(). ~ ~~ TO.:· LINEAR AND ANGULAR CLOSURES. . ·:-••• :· ;.:· 4-.) INSJRIIMEW CH IBBAJlQN· AU. MEASURING INSlRUMENTS ::· •• EMPLOYED IN TMIS SURVEY HAVE BEEN IU.INTAINEO IN •• •. •.• • · ACCORDANCE WITH MANUfACTIJRER'S SPEClflCATIONS AND ·:-:: HA\'£ BEEN COMPARED WITH AND AlJJUSttD TO A NATIONAL GEODETIC SURVEY CAL.!BRATED BASWNE WITH~ THE PRECEDING 12 MONTHS. N:170706.0:P2 t°' I > N:17064-8.968 E:1,.3031ff..l$..;. ~ 'ii:' '<i E:1J05s.J5.695 .. .. 1·-~ J.f.WlD.· ·+····.· ., ..... , .. SECTION CORNER ~-:::·· 1~\!i:C110N 7ER .·. ..-·· ~-· fetJND MCNUl.i'O'T (SEE SHtt1'$.,Y& -4) /."i~ :·'c·'~sur{~ PLS, ,.;,'\.-:·'· (C} •• ;. CAL_~TED BY.J;'LS, l~_C. .·:· CI is v 0 ,"l .... zl~ ~ ----s1-SE16-2N0-ST. i.i~I '< •••• O>w,;., ·:.. ~m 1~ ····= ... ~~.~ ·'°vt I I N.T.S. 5.) NI IOT AND TRACT CORNE"RS TO BE STAKED WITH 5/8" REBAR WITH CN' "8VP 17676• FOLLOWING RECORDING Of THIS SHORT PLAT. (209/230) ~-RWORO.-.of" SllRl,£Y BOOl</P~~ . .... ·:. . :, ...... ~.- · ....... >f ~~,~~l.:'sr·,··· .. ,,. ,,,.·.-,,,/''""""'"·!,· ml~~~~~i~~~l~~I~ 20070919900008 DOES OEPT. OF SPn lZI .N PACE9111 OF M4 e9/H112ee, u,z4 KIN, COIA<lfY, WI L MANAGER DAY OF BOOK Z.~ '2.. ~~ s .. r,...,, p,. 00~ ~ 't<- LAND SURVEYOR'S CERTIFlCA TE THIS SHORT PLAT CORRECTLY REPRESENTS A SURVEY MADE BY ME OR UNDER MY DIRECT SUPERVISION IN CONFORMANCE 'MlH THE REQUIREMENTS OF THE APPROPRIATE STATE AND COUNTY STAl\JTE AND ORDINANCE IN :f 1.11~ . 20 07 c:4 .. z;(,&,., .... '" BEN V. PETERSEN, CERTIFICATE NO. 17676 ~ " 0 ••Pt.S, Inc. ··---'11 NW Giman Bcwvanl', ffl fsuquah. ~ HOZT (415) 313-f.m (fax) J1U319 ·•:, .. ,, .... .,,·' DRA~ BY:··· EGH CHECKED BY: B'I? ,'LUND .SHORT .PLAT . .• £ ....... ~· .DATE: ,NL Y 19, sCAL£i 1"0 2d, •;_ 20·\. •:.,_ JOB NO,::: .. :::·· SHErn,.-, 4 (I :: ....•. -::::" :.~.;·;:~:I 5066 OF 4 ®. SHORT-R\..AT NO. L04S0037 .-: ~J-NG COl)NTY, WASHINGTON .=··· .. =·--· .·.= :·· . "'' .... ,~., .... ~-;~· ,.- KING ·COUNW .PLAT R!:CORDING NOTES: "1,1.L Bli1L91N.G ~ SPOUTS, .F6onNG oRAfNS. Mio·. DRAINS ~o.:; •' ~ ~~~~s~~u:~~~ J~~~ c~~-,~~::t~-:S~N ON rHE APPROVED CONST~N CAAWINGS 0./'l"FILE WITT-!·"OOES . ANO/OR T\1E DEPARTMENT of lRNiSf'ORTATION::THIS Pl.AN~ BE._,:' SUBMITTED Wffi-1 THE APPLICATION. of ~y BUltmNG PERMIT, All:.-••··. CONNECTIONS or THE ORA/NS MUST BE COHSTRIJCTEO ANO =~gJR0~1d~~E ~~~E~~~'iii,IN~fac~:p~~~sfgi. OR flLTRATJON SYSTEMS, THE DESIGNS SHAU. BE CONSt'R~ AT THE TIME or THE BUILDING PERMIT 1'NO SfW..l.. COMPLY Wlnf"l'Ht• PLANS ON F1L£." PURSt.l>.NT TO KCC 21 A.4J, SCHOOL IMPACT FEES SHAU. BE ADDRESSED AT THE TIME OF BUILDING PERMIT APPLICATION. THIS PLAT IS SUBJECT TO KING COUN1Y CODE 14.75, KING COUNTY ROAD MmGATION PAYMENT SYSTEM {MPS). THE MPS FEES PLUS TI-IE MPS ADMINISTRATIVE FEE SHAU. BE Pl>JD AT TME TIME Of" BUILDING PERMIT APPLICATION AT THE RA.TE !N EITTCT AT THAT TIME. PURSUANT TO KCC 21A..3B.230, AA APPRQVto TRE{~ON PLAN IS ON FILE WITH THE KING COUNTY OE~nmrr or ~ENT ANO EtMRONMENTAL SERll'IC£5 (O.O.E.$,.), RECORDS CENTER,. Of.;::. SHEET .Q..5. Of" THE APPROVED Et«.i~ERING Pt.ANS NO. Efi1n, ·:;. UNDER 1'C'TMTY NO.~ L~)'s 1 2 6 !'> ANO IBACT :C .. WITT-IIN THJS (SHORT) PLAT EITH&R' COITTAIN fREES·'tH,&J MUST BE RETAINED OR MUST BE Pl..ANTW. / REPt.AC£0 Ptk SAici :APPROVED TREE RffiNTION PLAN. AN'f llROPOSED Cl.£ARJNG, GRAClri~ OR ~wi:~.a.g~ES~TB~~~-~~~~t~~G COUNTY LANO USE SE~ OMSION, 9f< ITS SUCC~ AGENCY, roR COMPLJANC[ Wlftl:-'3Alc TREE R£!PffiON PL.AN .•. _-:: s:IBEfI TR[FS· •. _..-:· THE STREET ffi·~ PURSUANT fi):~ ;p1v1&°'SH.AU. BE OW~ J,Ntl'··· MAINTAINED BV'. W£ ABUTIING LOT 0WNEA$ UN!.£SS ANO L!NTIL KING COUNTY OR ITS 0 stJS:CESSOR ...crNCY 1--lA.5 .IDOPTEC A MAJNTENANCl: PROGRAM. • ', • ~··. ·'. :· •.,_.,.~· fONG OOINJY flRE w.RSHN CONOmoNS· ANY FVTVRE RESIDENCE CONSTRUCTED Qt,I LOTS 5, 6 ANO ffWITT-!IN THIS SHORT PLAT MUST BE SPRIHKI..EC (NrP1' 1 JC) UNLESS "1}1( REQUIREMENT IS REMOVED BY rHE KING COIJKTY FIRE t.lARSHN..:.9:R HIS/HER OESJGNEE. 1' PRIV1'TE EASEMENT IS HEREBY RESERVED f"OR N-10 GRANTED TO PUGET SOUND ENERGY COMPANY, O'NEST, COMCAST, (OTHER PRIVATE UTIUTlES). ANO THEIR RESPECTIVE SUCCESSORS 1'NO "5SJGNS UNDER ANO UPOH ALL PRIVATE STREtTS, A.L.LE'fWAYS AAD PRIVATE DRIVES ANO, THE EXTERIOR 10 FEET PARIIU..El.. WrTH AND ADJO!NlNG THE STREET FRONTAGE Of Al..l.. LOTS -'NO TRACTS AND 5.00 FEET PARAU.£1. WITH AND ADJOINING AJ..LEYW.I.YS AMO PfWATE DRIVES. FURTHER EASEMENTS AA£. RESE.~ OVER PRIVATE I.ANOS rOR V,&JJI...TS, PED£5TALS ANO RELATED fACtUTIES ('\IAIJLT EASEMENTS") ADJACENT TO THE 5-FOOT WIOE UTIUJY EASOIOO RESER\'O> IN THE PRECEDING SENTENCE "5 FOL.LOWS: THE VAULT fASOlENT "'°'y OCCUPI' VP TO AN .-.ODITIONAL 5-f'EET IN WIDTH (f"OR A TOTAL WIDTH Of 10 FEET) WITH THE LENGTH or EACH VAULT EASEMENT EXTENOING S Fm fROM EACH ENO OF THE AS-BUILT VAI.JLT(S). THE N1..11,18£R AlllO LOCATION Of VAULT EAS£MENTS Will. B£ "AS INSTIJ.UD" DURING THE UTIUlY'S INITlAJ... INSTALLMENT Of FACILITIES THE EASEMENTS ARE RESERVED 1'NO GR.t.NTEO IN OROER TO INSTALL. lAY, CONSTRUCT, RENEW. Clf)(RA.TE -'NO MAINTAIN UNOERGROUNO PIPE. CONDUIT, CABLES. WIRES, VAULTS ANO PEOEST.ILS WITH NECESSARY r.a.aunES AND OTHER EQUIPMENT FOR Tl-IE PURPOSE or SEIMNG THIS SVBOMS10N ANO OTHER PROPERTY WITH ELECTRIC, TELEPHONE. GAS, TELECOMMUNICAOONS, DATA lRANSMlSSION, STREET LIGffl"S AND U11UTY SERVICE TOG£THER WITH THE RIGHT TO ENTER UPON THE LOTS ANO TRACTS AT All TIMES FOR THE PURPOSES HEREIN STATED. THESE EASEMENTS ENTERED UPON FOR THOSE PURPOSES SHALL BE RESTORED AS NE.t.R "5 POSSIBLE TO TiiEIR ORIGINAL. CONDITION. NO UNES OR WIRES FOR TRANSMISSION Of EL.£CTR1C CURRENT, OR FOR Tn..EPHONES, CABL£ TEt..EVISlON, TEU:COMMUN!CATlONS OR 01'.TA TR>.NSMJSSION USES SHALl SE PlACED OR PERMITTED TO BE PLACED WITHIN 11-115 EASEMENT UNLESS THE SN.IE ~ BE UNOERGROUND. NO PERMA.NOO STRUCTURE SHALL 8£ P1..ACEO WITHIN THE EASEMEtmi WITliDl1T PERMISSION FROM EASEMENT OWNERS. .......... _ :~::=-~fAS.:::::~::;:·~~--~~~;, .AS " PR!Wo.tij;", ARE HERESY ~EO--~D:eoNYEYro TO KIN~~_. ;<;outm', A.•,)iolffiCAL SUBOMSI~ Ol<'THe'STATE OF W~t-lJNGf6N. .::·· FOR THE. ·PURPOSE Of -~~G,~Sl"ORING, MANAGING~ AN!}...;· • ,·. FACIUT~G STORM ,y,ID' SO~ACli' WATER PER THE ~NEERING .--~-=:Pfl: Tt:tf"QR ~s ~~~ ~~co~~~-~~- E'i.RESS). TO ~R SA10 DRAINAGE° EASEMENT FOR ~ PUJ~P'Ost:···:: .dF JNSf>ECTINY".·OPERATING, MAINfAINlNG, REft',IBING;»IO .-.-• _._:1i.cPRO\r1NG fi:IE ORAJW.GE FACltlTlES CONTAIJ'(EO fHt:rmN..:'NOTE THAT EXCEP'r FOR THE FACLl,jTIES WHICH t,t,,,.\IE BE£N F.Of™ALJ..Y ,'• ACCEPTO}-:iOR IUJNTENAtiC£ BY KING c,otiNTY, t.L6JN,TBIANCE OF;:.-~;1.r.~~S~ATE PRO~~ IS TH~~~SPONSISl!-!11' THE OWNERS OF S/10" PR!V.lffE PROPERTY AAE·-~EQU!RED 10-·· _,:· OBTAIN PRIOR WRITTEN N'PROY,IJ:.··rnow KING "COUNTY P,:.OPERTY ..... SERVICES, AND ~ 'ReculRED ..ptRt,ms ~ THE KING."courm-:· DEPARTMENT Of OEVELOPMvtl'.· ANO ENVlijbNMENTAL s(IMCES ,ftlR ACTMTIES SUCH 1'S CL.EARING AND GR.'rifNG, PRIOR -10 FlWt4'.:, PIPING, CVTT1NG OR REMOVING VEGETAliEl~-(EXCEP.l 0 'FOR ROOtiME LANDSCAPE MAINTENANCE SUCH AS LAWN t.iOWlt-1:(r).-IN OPEN:: VEGETATED DRAINAGE rACtUTIES {SUCH AS SW>US, CH.&.N~~ DITCHES, PONDS, ETC.), OR PERFORMING N>f'f ALTERATIONS CR". ~l~s...~E T~J~~NAGE r~IUTIES, CONTAINED WITHtN" .• _.. THIS EASEMENT IS fflEHOEO TO fACIUT1'TE REASON1'8l.E ACCESS TO TiiE ORAJW.CE fACIUTIES. THIS EASEMENT ANO CCJIIENN,IT SHAl..l Rt.IN WITH TH£ LAND ANO IS BINDING UPON Tl-IE OWNERS Of" SAID PRIV1'TE PROPERTY, THEIR HORS, SUCCESSORS Nm ASSIGNS. PRlYAJf QfWKAGf f.lSfMENI 92YfNANT· -·····:~~ ~:~:~=~rro1: !'o~~Ti-. H£REB"I' GAAJ.lt.AND CONVEY TO KING COUNTY, 1' POUTlCAL SUBDMS10N OF;THE ST1'TE Of" WASHINGTON, THE RIGHT, BUT KOT JHj;.: OBLJQ\TION • TO c:oN',O" OR STORE STORM ANO SURFACE W~ PER THE "LNGINE!:RING pUNS APPROVED FOR THIS SHORl PLA.f. :aY l<ING cq{.INlY, TOGEl"HER WITH THE RIGHT OF ~ Af:!;.tss (INGRESSj~D.t~). TO ENTER SAID OltAW.GE EASB,100 rem nit" PURPOSE" Of-·.Dl;lSER"JING THAT TME ,VWt,iERS ARE :PROPER~PERATING ANO MAJt«'AlNING THE ...... J--:::~~;~ PR::= ARE ~~NSIBLE rQR OPERA{lf<IG, ~Alt,llNG AN[l.•REJ:iNRINd:'fflE ORAJN,\Gf: FACIUlJ('S·· •.. CON,T~EO )'(f!'HIN SAID D.~ EASOIQ{I" ANO #RE. HERF.8:T ~IRED 10 OBTMN ~ REOUIRED PfRMll'k fflOM TllE t(l"G •• · ••COUNTY 0€PAATMENT Qt OE"VELOPMENT ANO OOiRONMENTAl SER\/'ICES :':'.RIOR TO f!QJNG, PIPING, CIJTTING OR REM~G •• \1£GET1'11~. (EXCEPT f'Of,I:. ROU"QN£. LN-IOSCN'E t.l.AltfilNANC[ StJCH·." "5 LAWN l'dt)'MNG) IN OPEN '«:GE1"Altµ 9RAIN.t.GE F.&CIUTIES (SUQH "5 SWN.£S;:~NEl.5, om::HES, PONOS;:ETC.), Oft"PERf()Rt,t!f:11) Nff ALTIRA"TfetG OR MOOIACATIONS TD ·'f'HE OR,,\INAGE rAClunts. CONTAINED wmillf:~O DRAIWGE J"}&MENT. _-; .·: THIS COVENANT ~·~~.;··~'THE LANO~ IS BIN01Nr UPON •• TI-IE ow~ or SAIC PRIVAT£ PROPERTY, -0,[IR HElRS, • ·.-•••• •.,,. SUCCESSORS A.NO ASSIGNS. •• •• .•' •. ~. ~~o~s:N~RAJT0~E~%BEAND PRO',··,:- PV,N t<fO. 4159 ON ru.£ WITH KlHG COUNTY DEPARTMENT or • 0£Vfl.OPMENT -'NO EJMRONMOOAL S£RollCES (OOES). Nfr DEVIATION FROM THE APPRO/EO PLANS Will. REOIJIRE WRlTT!N N'PR<:NAL fROl,I THE PROPER AGENCY, CURRENTLY DOES. RECORDING NO. VOL/PAGE J..'~;). /o 16 SCALE: 1 INCH = 20 FT. 0 10 20 4-0 60 PORTION OF NE 1/4-OF TI-IE NE 1/4 SEC. 29, TWP. 2.3 N., RGE. 5 E., W.M • PURI iC QR.t.lNAGE EASEMENT RESTRICTIONS· STRUCTURES, FlU.. OR OBSTRIJCTIONS (INCWOING BIJT NOT LIMITED TO OECKS, P1'TIOS, OIJTBUILDINGS, OR OVERHANGS) SHAf.L NOT BE PERMITT£0 BEYOND THE BUILDING SET"BACK LINE Of THE PUBLIC DRAINAGE EASEMENTS. 1'DQmON>U..Y, GRADING ANO CONSTRUCTION OF FENCING SHAU. NOT BE AU.OWED WITHIN THE PUBLIC CRAJW.Ot EASEMENTS SHOWN ON THIS SHORT PLAT M>P UNLESS OTHERWISE APPROVED BY KING COUNTY ODES OR ITS SUCCESSOR AGENCY. ALL INOMOUAL STUB-OUTS SHAU. BE Pf'UV1'TO.Y OWNED A.NC . ,M.6.11:fT~NEO BY TllE LOT HOME OWN~/··::._ ·.:/i/ {ttQPRfSSIHG)· : • ·:·-~. • • ~(FlousE .-.ooBEss svsrr,ri·. io«-. THJS -~T SHAU. BE AS fOUbws:; : .' .-: • •• ,_. ADDRESSES: pt'A{L BE A$SiGNEO fOB-:1ttt NOIUH -SOUTH R01'05 WITHIN THE RAl'«>E Of:·.HZol ID lfi'.\75 A.ND WITJ;IN..~ft.,-t.NGE: Of J]JOQ ID 11:575_-.f"OR TI-iE UST -WES{.~s. JNCMOl:lA.t., •• .ADDRESSES Will et· ASSIGNED . .fC! TllE PRtl'lCIPAl ENTRANCE Of ''' ~: .. ~6~-~-:0R 8Ul~~f:1N Aero~~.,~_: ... ~~~~-,~~~TY , •...... · . .-. ..... , ...... ·· ....•... ·.•· Rl;ifil:RICTIQNS FOR SfNsrtM" ABFA IBACJS ANP SfNSJJM O~~-~-~:~::::: ::s~-~J ANO _.;,/' BUFFER CONVEYS TO THE ~ A BENEf}9.~ .lNl'EREST IN THE_._-: LANO WITHIN THE TAACT /SENS(TNE AREA ANO BUF'FER. n-ns • · .. INTEREST INCLUDES THE PRES(&IATION Of N-'TM VEGETATION .fOR AU. PURPOSES THA.T BENEFIT THI: 'PUSL.lc;. t-j~nt'. -sAFET'l' A1t10 WELFARE, INCLUDING CONTROL Of suRtACl WAll']( A.NO utQ!,iON, MAINTE~ Of SLOPE STABILITY, AND PROTECl'IQN Of P.t.ANT AND AMMAL HABfT1'T. THE SENSITIVE AR£-' TRACT/SEliSffflt AREA, ANO BUFFER lt.lPOSES UPON All PRESENT ANO FVTURE" ·owNE~·· ANO OCCUPIERS Of THE I..NfC SUBJECT TO THE TR1'CT/SETBACl't:-.. •. ARE-' ANO BUFFER THE OBLIG"-TION, ENFORCEABLE ON BEHAI..F or . ·.:. -:·· THE PUBUC BY KING COUNTY. TO LEAVE UNDISTURBED ALL TREES • ~- AND OTHER VEG£TATION WITHIN THE TRACT /SOlstTIVE -'REA ANO BUFFER. THE VEGETATION WITHIN THE TRACT/SENSITM: AREA ANO BUFFER MAY NOT BE CIJT, PRUMED, COVER£O BY flU. REMCNEO OR CAW.GEO WITHOUT Af'PROVAL JN WRITING FROM THE KING coumy 00"1'RTMENT OF DEVELOPMENT AHO ENVIRONMENT.AL. S£R\IICES OR ITS SUCCESSOR AG(NCY. UNL£SS OTH£RWISE PRO\llOED BY LAW. THE COMt.lON BOUNDARY BETWEEN THE TRACT/SENSITIVE ARE-' .ANO BUFFER .ANO THE AREA or OE\/El..DPWENT ACTlVITY MUST BE : :~RKED OR OTHERWISE f"I.AGGEO TO THE SA.TISFACllClN OF KING • ·• · C00Nr( PRIOR TO ANY ct.EARING, GRADING, BUll.OING • CON$1Rl)ETION OR OTHER OE'IROPMDIT ACTMTY ON A LOT SUBJECT" TO TllE--sENSITM AREA TR1'CT/S0lstTh'E AAE1' ANO eu~. THE RE.OUIRtO. l,jARl(ING OR f"l..AGGtNG SHALL REMAIN IN Pl.AC£ UNTIL .41.L DEVE:l...Oi"MDf PROPOSAL ACTMTIES IN THE VlCllfrn' OF_;HE SENSITNfi'.· ARU-AAf. COMPLETEO. .:~~ BU~~ rouNDAn~s··~ ~fflDNO THE REQUIRED .:· 15-fOW' BUILDING SETBACK UNE. UNL£SS ·OTHERWISE PROVIDED ;.~·; BY~-,:,········.. ·;:.,·· •••••• •••••. ,.~--.·~~: ........... - .... -····"' TRACTS ~ 1'NC E ARE CONSIDERED "TRACTS" PURSUANT TO KCC 19A.04.J.30: A "TRACT" IS LAND RESER"Yill fOR SPECIFIED USES INCLUDING, lllJT NOT LIMITED TO, RESERVE TRACTS, RECREATION, OPEN Sf'M:E, SENSITIVE AREAS, SURf"ACE WATER RErENTION, UTILITY FACIUTIES ANO ...CCESS. TRACTS ARE NOT CONSIDERED LOTS OR: BUILDING SITES FOR PlJRPOSB or RESIDENTIAL OWEWNG CONSTRUCTION. TRACT "A" IS A PRIV1'TE JOINT USE DRIVEWAY TRACT roR INGRESS, EGRESS. PRIVATE DRAINAGE AND UTILffiES FOR THE 6ENEf'lT OF THE OWNERS OF LOTS 5 ANO 6. OWNERSHIP Of LOTS 5 -'NC B WflHIN THIS SHORT Pl.AT INCLUDES AN EQUAL -'NO UNOMOEC OWNERSHIP INTEREST IN TRACT "A" ,!J,10 AN EQUAL ANO UNDIVIDED RESPONSTBIUTY FOR THE I.IAJNTENANC( OF 51'10 lRACT. TRACT "13" lS A PRIVATE DRIVEWAY TRACT FOR INGRESS, EGRESS, UTIUTIES >J.10 PRIVATE OPJJNAGE ANO IS HEREBY CONVE'fED TO THE OWNERS Of" LOT 6 FOR OWNERSHIP ANO MIJl'ITENANCE. THE OWNERSHIP OF LOT 6 SHIU INCWOE THE OWNERSHIP Of" TRACT "B". AN ~Y)NG INGRESS ANO EGRESS WEMENT IS HEREBY CONVE'J~li TO jJl; .:9f THE LOT OWNERS {LOTS 1 THROUGH B, INCL!.!~ FOR .~CEsS TO rHE RECREATION TRN:T "c". .. .. L "C".iS ·!·~:ECREATIONAl TRACT FOR THE BENEffT OF AU. . LOT OWNUis IN THIS SHORT Pl.AT. OIYNERSHIP or A LOT WITlilN 1rllS SHtlRf PLAT {LOTS 1 THROUGH B, INCLUSIVE) INCLUDES AN E~·-ANO UNOMOEO OWNERSHIP lf'(IER(ST IN TRACT "c", A.NO AN .£00,1,L AND UNOIVID£0 RESPONSIBIUTY FOR lHE MAINTENANCE }~· "'SAID TRACT. TRACT ·er IS CONVEYED TO KING COUNTY FOR DRAINAGE PURPOSES UPON TI-IE RECOROlNG OF THIS SHORT PLAT. TRACT '"E" 15 A SENSITIVE ARE-' TRACT. OWNERSHIP OF A LOT WffitJN THIS SHORT PLAT (LOTS t THROUGH B. INCI..U~ INCLUDES AN EDU.Al. ANO UNOMOEO OWNERSHIP INTEREST IN TAACT T, AHO AN EOUAL ANO UNOMOEO RtSPONSIBlUTY FOR THE t.WHTENANCE ANO PROTECTION or SAID SENSITIVE AREA TRACr . AN INGRESS ANO EGRESS EASEMENT IS HEREBY DEDICATED TO KING COUNTY. OR ITS SUCCESSOR AGENCY, OVER .ANO -'CROSS TRACT "13" ANO THAT PORTION Of TRACT ·c· DESIGNA-1ED AS •ACCESS EASEMENT" FOR THE PURPOSE OF PROVIDING ACCESS TO lRACT "o". "I,$ THIS SHORT PLAT W~ VESTED PRIOR TO JANUARY 1, 2005. TH£ FOt..LOWING Cl.EARING ANO GRADING NOTE N>PUES: CONSTRUCTION WORK INVOI...VING SOIL OfSTUR&.NCE, GR1'0ING, AND AWNG OF THE SITE. lNCU.JOING JNOIVlOUAJ.. RESIOENTW.. BUILDIMG PAO PREPARA.TION, IS PROHIBITED FROM OCTOOER 1 THROUGH t.lARCH 31, UNLESS OTHERWISE Al"PROVED 8Y KING COUNTY ODES OR ITS SUCCESSOR AGENCY." -~~·-·-, ... ···.~;·:):, ( '' .... _, ·, :.-: ::: :·.':·,,' . ,·-·~·.-.. -:~· .. _., {:}}······--·· EXPIRES: 11/12/08 ••PI.S, Inc. ··---317 NW Gibma Blxdlnrd. ffl --""" (4ZSJ31um puJ num ........... :,:, ,,, •... .. , .. • DRA'IIN BY: EGH OiECKED BY: aw t:tNo sHi>in PV.T ···:_./· .:': .. . . .JOB N0:/\066 DAlE: ;. · •.. JULY'.19, 2007.°: ·-· _.. -· ); OF 4 SCALE, SHEET, 1·= 20' ~ e= cs,;;i e· ,O'I ,O'I •..-4< :a,~ • e~i? t,,..~"!;r£ ISi~ _ .... .;.u _ ..... :::i .,.,__.._.~_,,,NSR~ ~ Sl-!-ORT,~L.AT NO. L04S0037 -~ -~ING C~l,/NTY, WASHINGTON . l._,. .. ---~7· rou~· PUNQ-1 1N BRASS CAP sr~iilPEO •11354·~ ·se.r·. lf'i :rx3· QlNCRElE M~OMENT tN ?.,SE .. :::,r .. .r .. , . I~ -.. -~·-- .... •· .<B. . :,,;:,.. ~ Pl"T GlE Of '55'37" •o ,~ ' ' _.l)[OICAlED ~--·THE PUBU(:.USE . ·.toq ROAD :!;'\JR POSES lJPOO ··:'RECORDINg;or THIS ~T PLAT JO' I- ~ Cf) i 0 z N <.O T-.-.~- r -.- 1 ••• ····-~:: ' B-1·.· Ij,;: -~--· .;! ~ -,· ~ ~ .-.- ~ _._:"·" R-25.00' Lc39.30' ba901>4'2J" ~~~:~ a.a.ii· SF _._.:-- i1~ :') ~ ·-~i J.Eroill· ~ FOUND MCNUMENT (A.S NOTED) (M) MEASURED BY PLS, INC. (C) CALCULATED BY PLS. INC. (P) PER PLAT ~ Al<ER:'S FARMS NO. 6 Sf" SQUARE FEET BS8l BUILDING SET BACI< UN£ ._ .. :-.:..:.:..:..::. '':.-: ._ .•. ·······-,:-.. \'./· LOT2 16,697 SF 121 NOTf· 100 YE-'R FLOOD B.fVATION PURS.IA.NT TO "ENGINEt:RING PLAN IN LIEU Of' MINOR FLOOO PLAIN STIJO'r'"' AS PUBLISHED IN APPOIOIX E Of' TI-IE PROJECT TECHNICAL INF{lRMATION REPORT (TIR) ANO APPROVED BY KING COUNTY DOES. RECORDING NO. SCALE: 1 INCH c= 20 FT. PORTION OF VOL/PAGE ;2,21011 0 10 20 40 NE 1/4 OF THE NE 1/4 SEC. 29, TM>. 23 N., RGE. 5 E.., W.M. 114TH AVE. SE -·-:_.·;: ·:, .... --·::._ N01'JJ'29•E 656.33' (M)(P) (BASIS OF BEARING) --- N01"33'4J"E (P) 596.07 (P) .. · .. ;:;IE --.-~ !"' ~ 20· ~, .. •• ~ . !~-/: >rRAcr·I'·.,,. . 'f,: >--.· <' 61.16' .,···· .1.0;p __ · .. ·' 4,226 SF ., . .-.-···· '''"--~ -·····-· ti Ii ~ a. ~ •.'.._ " :p VJ "' -• N01'3.'.5'29 54.21' ,.,. /Jli: LOT 4 j 'i. 1:-GtS·-Sf. _.;::·· 10' Pfl;tli.ATt :·-'T-~f!'MGt £ASEMENT _.....,,_ ___ _ .N01 'J3'29"E in 54.21' ;,, ii i,i: -. ~ m ; 20· TRACT B -..... -..... -1--::::::.... lil ii t ~ 60 (/) m m (/) I m ':'J .. w· ·····--., ·. ~,~ !i i;·· ?>;-"!}-L "'! ~ I~ T ~' ~ i ~I z /:I) :: .. :,. ,o• .,_,, ............. ,•' ·.,,.,-~- \ r-\ flOOD AREA (2) o.oo· -:-~· I,-.-< \..,V' ' -, -·-=.-_._ ..••. .-. .-:·· ···:, ... --.·:- . ···61.:o_!;___,_ .-···' 75.00' N01'33"29"E 95.oo·· 20.00' ll ~ . " .. ···· .. ~OT 8 _.~;:246 SF .•.• ~ ~tf?,So . .. ,~ _::·-·-:-i~ :: 5 '750' •. .:· __ .• -·-·.. . N0]"33'29"E ;95:QO'·(t) 59~98' (P),:'- . ,.•· ... -~·-' •:. ·.· . _:· , .... \l .-:_._. ..... ') ,:,.• (' 1 -.:: ... ..,....... .-.·~· vv .-.--)\t.:"----... x:,.,\.-.-: r-" ...... ...._:t'I'___., _ ..... ),c--i: Ir''-· LOTS 4,278 SF 6§,_59' .,-·--.-... ~,,., cm ~ .. •' ~ l._6.~ .. ---···-·-, -----~:·::·;? LOT6 3,803 SF ~,-~ g m \ \ ' \ '-.. '-. -..... 7.57" --- • ~ ;... N01-0T01"E "" ,.. : / -i~· .i,.t, -• _;_...,----- -..... - ~':t::I'--'-~-f flOOD AM.A (2) ··-:-" ,/ 1""_ r-, ~---,...,._:· r'1 '\.-",0··-·.-b \ ~,J. :, ...... ·:: -:_ .. :·_._.:==·· __ _.-:·:., _.;.• • -...•• ·1--.~. ~. -:-· EXFVtES: 11/12/08 -------:-. .-:,:, .. ,, -~- ••PLS, Inc. ··---Jf7 NW GJlma11 Boulffud, 129 ,..._, Wa#llrlpM NflZT (42!} J1J.1371 (faq J1J.ffl9 ·' ,-·· ,,•' EGH CHECKED BY: B'IP ·····--.-... .,_ ···-.... .-:~:--· , . . . _ .1\JOEI NO.: •. --~---JUL_-r-=i9, 200·( ./-'' 5066 SCALE:··-· s;EET: •.:._., ·,. ? OF 4 ,._ 20· ·:·,:-.. _.l/ ··"',,.._ _ .... .,_~ , .. ,_...,, -,- ·-·=:: ... RECORDING NO. VOL/PAGE J.EQWD.· S f'OUNO MONUMENT (AS NOTED) C2l NOTE· 0 / '2- (M) ME:ASUR(O BY PLS, INC. SCALE: ~ SHOR-T. .. PLAT NO. L04S0037 . ~):(ING ~$0NTY, WASHINGTON 100 YEAR Fl.000 EllVATIQII PURSUANT TO •ENGINEERING PL.AN JN LIEU OF MINOR FLOOD PLA.!N SlUOY°" AS PUBLISHED IN APPENDIX E Of THE PROJECT TECHNICAL INrO:.MATIQII REPORT (TIR) AND APPROVEO BY KING COUNTY DOES. 1 INCH -20 FT. ,.·.······· "' Iii w I (f) w w (f) (C) CALCULAiED BY PLS. INC. 0 10 20 40 (P) PER PlAT OF AKER'S f'ARMS NO. 6 PORTION OF SF SQUARE FEET NE 1/4 OF THE NE 1/4 SEC. 29, Thf>. 23 N., RGE. 5 E., W.M. --.c---'' .. ~··-·-~,·~- ii :,1ii -. n m 20· TRACT B 1850 son g ii t b BSBL BUILDING SET BA_CK LINE (R) RADIAL BEI\RING _.. ·ll41H AVE. SE NO)'J.J.'~g.,;~ 656.33' ,_(/,)(P) (BASIS OF BEARING) -.-.. -·-t."~'~::,}~P.) .:: . -~-- :120 04' ,(· I ,;· l ·. ' ;ri '"'I~ ... .,. I" -,~-,~\ . r·. .\ . ..-I . ·,, .. \ 105.JS' .-:\ · ....... ) .;-"·.· \ g OEDICA TEO TO THE PUBLIC USE FOR ROAD PURPOSES UPON RECORDING Of' THIS SHORT PLAT ,f~c,:.!a .... _$[NSIT1;~~;:E; TRACT R•25.00' L-39.42' 6=90'20'58· ..5-::.-.: I 4~20' LOT7 9,001 Sf ---..!..!1,!!.._ -~.CWJJ'29i __ 10' PRIVATE DRAINAGE: EAS£M(NT S01'JJ'29·w 120.04' ::: I I I -1- b ~ i. .. 10.92' . / .: ' < . .-.1 ~1'u .. .,:1'.ANt> ... \ .. ·.· ---·-/···,· ,.,-.:· • :--- ', ,~ J ~;~~:,,:.,l ',,j /J •, :~ ,,II! ..... :·:·--::·::·:z· !o, b. ~ ....... B7.76' ~'~ATE-r ··::.·-~ TAAcn::' · "iiu..cr,1>_ DRAINAGE: __j EASEMENT . ;EAJltiNAL "TRACT ~CR .!'; 456 SF ~f"'·:d~., '.··. . ~ \ '."< -'" ...• , ··' ., ' ···,. ,. ,-• ~. ·-J .• •. ,. w \ • " --,,. ' •• • ..... • ' hOOO AREA (2) / FL l •.• P,RAINAGE ~CT 6~28 SF _:.: ,. .. ' . ,.. . .. ., " --·' .. ·,.··· ' . •... . ' .. . . .. . ·. . ""''' . ~.,_ . .... ·, . .J ......... ---~... '" ··-·-' ·-· /' ' . . . . ·•··· -.... 19967 ., ~ 63,63" . N01W'Ot .-,,,,._;.__ •• .-. -··, ••••• ,, ,.,r . NOIW0t•E / ~ \ ~ ~ 5 / lO' DRAINAGE-/ -~ EASEMENT ,, I " " 2~7.58' := -· ., ......... . N01 "33'29"F ·. ·.595.09'.,fe_F 59 •. 98!°:(P) .. ·-· .-;·: .. :: "------ I I .,. ' 0"° 1...-J \ ' ., ................ : .. ······. ····:. -:· . ,._. .... .:· ,--...,,,,·. ,../ .• '":J.' V .....,.:"' .--1:\...· •c .... • • I =:~f:.~;·;:·;r .:L,\..-r-r...v,,'J,.....,, -.... ) '~... \ .:--.i. _.:."·~-- ·-:: JO' f'OUNO BRASS TACK lN LEAD, SET IN 4•x4• CONCRETE MONUMENT IN CASE 1 .. I ='1 ........ 1 ._-.,·_ 6 !/ 1" ~ ~ 3' b ~ C! .., 0 in ~ ii,, ii ; I f-'. (/) I I- V' co ~ w (/) ~ f'OUND BRASS TACK IN LEAD. SET IN 4"X4" CONCRETE MONUMENT IN CASE .::=····=·-···-:. • =·: ........ · 60 \,c ,,._ -.. r,. , \. \ ,. ··.-.r r,I"' -t,.. \ 0·-· .. .-:·~ \~v· .. ;-.. ··--·····r· aaPLS, Inc. ··---1f7 NW GBman Bowwrd. 129 __ ...,., (425}11Hnl (fa:) 1fJ.n1t , ...... •:: .. ... ,,._., .. DRAWN BY(:;: EGH CHECKED BY: BW '.'-·.·.-,: rf~ :.ilJND ~;ORT p(A T .~AlE: :· .... .A{fY 19, 20?."7 scAi:£:· 1"-= 20' OF 4 ·:: .• : .... ~..::·- ' .... l:l;;l±!,;~;qtJ;!;ttJ:1:1 Taylor Engineering i....111111111111111111111111111111111 Co ns u lta n ts TECHNICAL INFORMATION REPORT .• . ,>:; :·... : ~\. :. '• , ' . for ": Guy Lund Plat King County T~x Parcel tiJb. ,0088000170 . l . .. ' . Project# A04Ptv1120: # L04S~037 Site Address: 162171141hAv~nue,SE Renton, Wa~.hington '.··. ~·t,: }:; 17 # fi7,HI r11.,,,1 ~/\ VVf I 'jfla,t,fl f~ ':O;· TEC Project No. 281-PLS .. -.... . -~ . ·r;{J:\{ ·i ' , Prepared by: Lorna M:,Taylor:R:E·.:{ :;::rw • , ·oate: ,September 1i; 2005 ' · . Reyi~ed, ):1~y 10, 2006 205 Front St. S. • P.O. Box 1787 • Issaquah, WA 98027-0073 • tel.' (425) 391-1415 • faic (425) 391'_1 ~51 • ·,yw•jitoccjyil com . ' .. ····-~~~ ' . • •• • Technical Information Report Lund Plat Section 1. 2. 3. 4. 5.· 6. 7. 8. 9. 10. A1rnendices Appendix A: Appendix B: Appendix C: Appendix D: Appendix E: Appendix F: Appendix G: TABLE OF CONTENTS Description Project Overview ......................................... . Page Number 1 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 1. Technical Information Report (TIR) Worksheet 2. Site Location 3. Drainage Basins, Subbasins, & Site Characteristics 4. SCS Soils Map Off-site Analysis Drainage System Table and Map Analysis and Design 1 5 6 9 9 9 9 9 10 Maintenance Requirements for Privately Maintained Drainage Facilities Retention/Detention Facility Summary Sheet and Sketch Engineering Plan in Lieu of Minor Floodplain Study Sensitive Areas Study Bond Quantities Worksheet TEC • ,. • Technical Information Report Lund Plat 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). Appendix A contains a Technical Information Report (TIR) worksheet for the project (Figure 1), as well as a Site Location Map (Figure 2), a Drainage Basins, Subbasins, and Site Characteristics figure (Figure 3), and a Soils map (Figure 4). More detailed site information is included in Appendix C with the existing and developed site runoff model data. The 2. 05-acre site is located at 16217 1141h Avenue SE in Renton, Washington. SECTION 2 CONDITIONS AND REQUIREMENTS SUMMARY Following is the text of the Preliminary Conditions of Approval. All of the conditions 1 -12 either have been addressed, or will be addressed for the project. Note: number 3 is missing from the original text of the conditions and is assumed to be a typographical error. 1. 2. G. DECISION: A. B. C. Proposed Short Plat (file No. L04S0037), received October 4, 2004 as described by Attachment 1 of this report is GRANTED PRELIMINARY APPROVAL; subject to the following conditions of final approval: Title 19A Compliance with arr platting provisions of Title 19A of the King County Code. All persons having an ownership interest in the subject property shall sign on the face of the final short subdivision. All utilities within proposed rights-of-way must be included within a franchise approved by the King County Council prior to final short plat recording. Surface Water Management (KCC 9) 1998 King County Surface Water Design Manual (SWDM) FULL REVIEW The proposed short plat qualifies for full drainage review as outlined in Chapter One of the Surface Water Design Manual. Final short plat approval shall require full compliance with the drainage provisions set forth in King County Code 9.04. A professional civil engineer, licensed in the State of Washington, shall prepare drainage plans and a technical information report as outlined in Chapter 2 of the drainage manual. The drainage plan submittal shall demonstrate compliance with all applicable Core and Special Requirements. Compliance may result in reducing the number and/or location of Jots as shoWn on the preliminary approved short plat. Preliminary review has identified the following conditions of approval, which represent portions of the drainage requirements. All other applicable requirements in KCC 9.04 and the Surface Water Design Manual (SWDM) must also be satisfied during engineering and final review. A. Drainage plans and analysis shall comply with the 1998 King County Surface Water Design Manual. Prior to short plat recording, the applicant shalt submit drainage and engineering plans to address the required short plat improvements. King County approval of drainage and roadway plans is required prior to any construction. Permit fees for review and inspection shall be paid as required by County codes and policies. Bonding for the drainage plans wiJI also be established as determined by DOES prior to plan approval. After receiving drainage plan approval, the applicant shall contact the DOES Land Use Inspection Section to schedule a pre- construction meeting prior to performing work on the site. 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 shalt be connected to the permanent storm drain outlet as shown on the approved construction drawings on file with DOES and/or the Department of Transportation. This plan shall be submitted with the application of any building permit. Att connections of the drains must be constructed and approved prior to the final building inspection approval. For those lots designated for perforated stub·outs, dispersion, or infiltration systems, the designs shall be constructed at the time of the building permit and shall comply with the plans on file." I TEC • • Technical Information Report Lund Plat 4. SITE SPECIFIC CONDITIONS As required by Special Requirement No.2 in the drainage manual, the 100-year floodplain limits determination calculations shall be included in the Technical Drainage Report (TIR) and delineated I shown on the final engineering plans and the recorded short plat for the existing onsite depression. Road Standards (KCC 14) 1993 King County Road Standards 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). The proposed short subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: A. The proposed subdivision shall comply with the 1993 King County Road Standards (KCRS) including the following requirements: 1. The proposed on-site access serving proposed lots 5, 6 & 8 shall be placed in a Private Access Tract (PAT). These lots shall have undivided ownership of the tract and be responsible for its maintenance. The PAT road improvements shall conform to KCRS 2.03 for Urban Minor Access Road Standards and shall include 22 feet of paving with concrete curb and gutter on both sides of the road. The minimum tract width shall be 26 feet with a maximum length of 150 feet. 2. 1141h Avenue Southeast fronting the subject property shall be improved to Urban Sub-Access Standards, per the 1993 King County Road Standards, Section 2.03. 3. Southeast 162"d Street fronting the subject property shall be improved to Urban Sub-Access Standards, per the 1993 King County Road Standards, Section 2.03. 4. Southeast 1641h Street fronting the subject property shall improved to Urban Neighborhood Collector Standards, per the 1993 King County Road Standards, Section 2.03. 5. Street trees shall be included in the design of all road improvements, and shall comply with Section 5.03 of the KCRS. 5. Health (KCC 13) This project is exempt from further King County Heath Department review. However, if improvements are required from the Sewer and/or the Water District, then verification shall be required from said District(s) that the improvements have been bonded and/or installed, prior to final recording of the short plat. 6. Building and Construction Standards (Title 16) 7. A. The applicant shall comply with all applicable provisions of KCC 16.82.T B. The applicant shall demonstrate compliance with KCC 16.82.150 (clearing standards) requirements at engineering and final short plat. Fire Code (KCC 17) Section 902 of the 1997 Edition of Unifonn Fire Code 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. 8. Zoning Code (KCC 21A) A. Density and Dimensions (KCC 21A.12) B. 1. 2. 3. 4. 5. All lots shall meet the density and dimensions requirements of the R-8 zone classification or shat! be as shown on the face of the approved preliminary short subdivision, whichever is larger. Minor revisions to the . short subdivision, which do not result in substantial changes and/or do not create additional lots may be approved at the discretion of the Department of Development and Environmental Services. Street Trees (KCC 21A.16) Street trees shall be provided as follows (per KCRS 5.03 and KCC 21A.16.050): 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. 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. 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. 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 if located within the right-of-way, and shall not include 2 TEC • • Technical Information Report Lund Plat .9. 10. 11. 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 . 6. The applicant shall submit a street tree plan and bond quantity sheet for review and approval by ODES prior to engineering plan approval. 7. 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. Sensitive Areas (KCC 21A.24) The proposed subdivision shall comply with the Sensitive Areas Code as outlined in KCC 21A.24. Permanent survey markings and signs as specified in KCC 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 KCC 21A.24 shall also be addressed by the applicant. A. Wetlands 1. Class ·3 wetland(s) shall have a minimum buffer of 25 feet, measured from the wetland edge. 2. The wetland(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). 3. Buffer Averaging, as shown on the approved plan set, meets provisions of the King County Sensitive Area Code 21A.24320 (b). 4. A minimum building setback line of 15 feet shall be required from the edge of the tract. B. Streams 1. Class 3 stream(s) shall have a 25~foot buffer. 2. 3. C. 1. 2. D. 1. 2. The stream(s) and their respective buffers shall be placed in a Sensitive Area Tract (SAT). A minimum building setback line of 15 feet shall be required from the edge of the tract. Alterations to Streams or Wetlands Alterations of streams and/or wetlands are approved in conformance with KCC 21A.24. As an alternative to mitigation plantings, the applicant has provided buffer averaging in excess of 2:1. The Sensitive Area Tract that includes the Class 3 wetlands and associated Class 3 stream shall be fenced with split rails (spit rail fence) and posted with Sensitive Area signs. SDO Conditions (KCC 21A.38) -The following Special District Overlays apply to this site: Significant trees -Calls for the retention of a certain percentage of the trees on the site. Seasonal clearing restrictions -Clearing is limited to April 1 scthrough September 301 h. Road Mitigation Payment System The applicant or subsequent owner shall comply with Road Mitigation Payment System (MPS), King County Code 14.75, by paying the required MPS fee and administration fee as determined by King County Department of Transportation. The applicant has an option to either: A Pay the MPS fee at final short plat recording, or 8. 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 short plat application and a note shall be placed on the face of the short plat that reads, "All fees required by King County code 14. 75 have been paid." If the second option is chosen, the fee paid shall be the amount in effect as of the date of the building permit application. Lots within this subdivision are subject to King County Code 21A.43, which imposes impact fees to fund school system improvements needed to serve new development. As a condition of final approval, fifty percent (50%) of the impact fees due for the plat shall be assessed and collected immediately prior to recording, using the fee schedules in effect when the plat receives final approval. The balance of the assessed fee shall be allocated evenly to the dwelling units in the plat and shall be collected prior to building permit issuance. 3 TEC • • Technical Information Report Lund Plat 12. 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 performance bond for recreation space improvements shall be posted prior to recording of the plat. Other Considerations ~,· A. Preliminary approval ·o, 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 not be limited to, obtaining a forest practice permit, an HPA permit, building permits, and other types of entitlements as necessitated by circumstances. B. The short subdivision shall conform to KCC 16.82 relating to grading on private property. C. Development of the subject property may require registration with the Washington State Department of Licensing, Real Estate Division 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 site currently contains three distinct threshold drainage areas and a wetland. The site "developed" system will maintain these drainage areas and discharge runoff at its historic locations. 2. Off-Site Analysis: A Level 1 offsite analysis was conducted for this plat as described in Section 3. 3. Flow Control: The Level 2 detention pond was sized for onsite drainage and a Level 2 detention tank was sized for roadway drainage along 1141 h Avenue SE to meet the requirements of the KCSWDM, using the KCRTS routine. Appendix C contains the KCRTS input and output. 4. Conveyance System: The conveyance system was sized to convey the 25-year storm without flooding and in fact, the predicted 100-year storm flows can be conveyed without flooding as shown on the output data from the KCBWP analysis in Appendix C. 5. Erosion and Sedimentation Control: Runoff from the grading and trenching construction areas will be contained by a temporary construction entrance, silt fencing and a sediment trap 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. 6. Maintenance and Operations: The detention pond and all drainage and street work within public tracts, rights-of-ways and easements will become the property of King County. 7. Financial Guarantees and Liability: The bond quantities worksheet is in Appendix G. 8. Water Quality: Treatment of runoff will not be required because non~ of the threshold drainage areas will have more than 5,000 square feet of new and replaced Pollution Generating Impervious Surfaces (PGIS). Special Requirements 1. Other Adopted Area-Specific Requirements: Level 2 Flow Control will be required. The north basin area contains a closed depression, which does not receive any runoff from off-site. The project does not propose any changes to the runoff in this basin . 4 TEC • • Technical Information Report Lund Plat 2. Floodplain/Floodway Delineation: An engineering plan, in lieu of a minor floodplain study is required to document that the proposed development will be at least 10 feet above the ordinary high water mark, or 2 feet above the downstream overflow elevation. See Appendix E. 3. Flood Protection Facilities: Not Applicable. 4. Source Controls: Not Applicable. 5. Oil Control: Not Applicable. SECTION 3 OFF-SITE ANALYSIS The following subsections describe the inspection and evaluation of the site and its surrounding areas particularly the downstream drainage paths. Task 1. Study Area Definition and Maps The Figures in Appendix B show the extent of the study area and the local topography. There is no runoff onto the site because the roadside drainage system transports runoff from the north and east of the property around the property to the west. The Site Plan drawing shows more detailed topographic information on the project site. Task 2. Resource Review King County mapping was consulted and King County's Drainage basin mapping shows the site draining in three different directions to three different drainage basins: to the Black River to the north and west, to the Lower Cedar River to the east, and to Soos Creek to the south. However, as described below, physical inspection of the site shows this mapping to be inaccurate. In fact, the entire site ultimately drains to the Black River, but in three distinct drainage paths creating three different threshold drainage areas. Task 3. Field Inspection A Level 1 off-site analysis was conducted on January 27, 2004, with several subsequent site visits to verify the initial findings. At the time of the initial site inspection, the weather was cool and sunny. Task 4. Drainage System Descriptions and Problem Descriptions The figures in Appendix B show the three downstream drainage paths for the four drainage basins on the site. Any overflow from the wetland area on the south side of the site drains into the South Downstream Drainage Path described below, which also conveys runoff from the east portions of the site. All these drainage paths converge at a point more than Y. miles from the site as described below. 1) North Downstream Drainage Path: The runoff from the north portion of the site flows into the closed depression on the site, which does not show any signs of overtopping. It appears that all runoff into this depression currently infiltrates because the depression typically does not contain standing water and does not support any wetland indicators. The adjacent roadway ditch prevents runoff from the road and upstream areas from entering this depression. However, the downstream drainage path described herein is for the overflow from the closed depression should it overtop: From the closed depression, the north portion of the site would drain west in a roadside ditch and culvert system along the south side of SE 162nd Street, flowing west to the end of the roadside ditch. From there, it flows overland 5 TEC • • Technical Information Report Lund Plat across a semi-vacant storage yard to a sharp grade break and down to the bottom of a large natural ravine draining to the northwest. 2) South Downstream Draina~e Path: The eastern and southern (wetland) portions of the property, as well as the 114 Avenue SE and SE 164th Street drainage from the roads and a small upstream tributary area to the east, drain west in a roadside ditch and drivewa~ culvert system along the north side of SE 164th Street to the bottom of the hill near 109 Avenue SE. This roadside system discharges into the same large natural ravine draining to the northwest. 3) West Downstream Drainage Path: The remainder of the property drains directly west through private property, initially in a drainage ditch and stream and then in a long piped system which discharges into the same large natural ravine between the discharge points for the northwest and southwest drainage paths. Task 5. Mitigation of Existing or Potential Problems To mitigate any water quantity impacts from the project, Level 2 detention in accordance with the King County Surface Water Design Manual (KCSWDM) will be required as part of the development. · Treatment of runoff will not be required because none of the threshold drainage areas will have more than 5,000 square feet of new and replaced Pollution Generating Impervious Surfaces (PGIS). SECTION 4 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN The following subsections describe the measurements and criteria used to size the detention 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, 6% -15% 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. '-Tne NW basin will not be changed. N Basin E Basin W Basin S Basin Area (ac) Area (ac) Area (ac) Area (ac) Description (Site) (Street! {Sitel {Street) /Street! /Site) (Street! Forest 0.38 0.18 0.09 Impervious 0.03 0.06 0.03 0.26 0.05 Pasture 0.05 0.10 0.25 0.57 0.47 0.03 Grass Wetland 0.01 0.01 0.12 0.01 Total Area 0.41 0.11 0.32 0.51 0.72 0.59 0.04 Note: Some areas include some round-off error . 6 TEC •• Technical Information Report Lund Plat Developed Site Hydrology (Part B) The runoff from the four different drainage basins on site will be discharged as follows: North Basin. The total allowable development in the North Basin will not increase the impervious surface area by more than 5,000 square feet. Runoff from this basin will continue to be discharged to the surface on-site or to the downstream ditch and culvert system via a perforated downspout connection per existing conditions. East Basin. The proposed drainage systems will route East Basin runoff to a Level 2 detention tank that will release runoff to the ditch along SE 1641 h Street, as shown on the plans and described in the "Offsite Analysis" section of this report. West Basin. The proposed drainage systems will route West Basin runoff to a Level 2 detention pond that will release runoff to the stream at the west property boundary. South Basin. Clean runoff from discreet roof areas will be directed to the wetland area also known as the South Basin. This situation has been determined to mimic existing conditions in the South Basin. This configuration very closely mimics existing conditions and discharges all runoff in the directions and locations where runoff from these basins currently flows. The developedsiteronditions ·identified for this project and used in the KCRTS modeling inciuded: ·--------- N Basin E Basin W Basin S Basin Area (ac) Area (ac) Area (ac) Area (ac) Description (Site) (Street) (Site) (Street) (Street) (Site) I Street\ Forest Impervious 0.11 0.07 0.06 0.37 0.41 0.16 Pasture 0.25 Grass 0.28 0.04 0.15 0.15 0.52 0.02 Wetland 0.12 0.00 Total Area 0.39 0.11 0.21 0.52 0.91 0.54 0.02 Note: Some areas include some roundwoff error Performance Standards (Part C) The potential increase in impervious surface area for the North Basin is less than 5,000 square feet; therefore, detention is not required for this basin per the Impervious Surface Exemption to Core Requirement #3. No significant development is proposed for this basin at this time. For the East Basin detention tank and West Basin detention pond, Level 2 Flow Control requirements and parameters were used to size the facilities. The South Basin required careful consideration of tributary areas to match existing conditions and not deprive the wetland of water nor inundate ii with too much flow. Water quality treatment is not anticipated; however, the project site is in an area designated for Basic Water Quality Treatment. Conveyance features-were sized to convey the 25-year developed runoff and their performance during the 100-year event checked to be sure that significant flooding will not occur as a result. 7 TEC Technical Information Report Lund Plat • Flow Control System (Part D) • • North Basin. No flow control is required for the North Basin per the "Impervious Surface Exemption". · East Basin. The East Basin detention tank was sized using the KCRTS routine. The following table summarizes the sizing and control requirements for the detention tank. Detention Facilitv East Basin Tank Required detention volume 1,143 cf Effective storage depth 3.5 ft Tank Diameter 4 sf Tank Length 98 ft Orifice #1 diameter 0.88" (7/8") Orifice #2 diameter 1.13" (1-1/8") Orifice #2 heiaht above bottom 1.80 ft West Basin. The West Basin detention pond was sized using the KCRTS routine. The following table summarizes the sizing and control requirements for the detention pond. Detention Facilitv West Basin Pond Required detention volume 7,605 cf Effective storage depth 3.0 ft Top area (@ 1' freeboard) 4,164sf Bottom Area 1,821 sf Orifice #1 diameter 0.71" (11/16") Orifice #2 diameter 0.68" (11/16") Orifice #2 heiaht above bottom 2.0 ft South Basin. Minimal development is proposed for the South Basin; however, it contains an existing wetland which must be protected. Of particular concern is maintaining adequate flow to the 0.13-acre wetland once the required frontage improvements along 114th Avenue SE and SE 164th Street are completed. The existing onsite and adjacent frontage areas tributary to the wetland total only about 0.51 acres. This is probably not enough area to support the wetland so the existence of the wetland strongly suggests that there is a hydraulic connection with the adjacent ditch. Assuming there is a hydraulic connection, the exact volume of runoff currently supplying the wetland would be impractical to accurately determine. The upstream area tributary to the adjacent ditch is at least three times the wetland tributary on-site area; however, since the connection is subsurface, only a small portion of this upstream runoff may impact the wetland. The design solution is to disperse clean runoff to the wetland from discreet non-traffic areas. The areas were selected so the peak flows and volumes exceed the flows from existing on-site tributary areas (which can be easily analyzed) by about 80 percent to approximately match the existing runoff regime, but more importantly to provide adequate water for the proposed wetland buffer mitigation. The proposed flow rates and volumes have been coordinated with the Wetland Mitigation Plan. Descriptions of the procedures used and calculations and computer output are included in Appendix C . 8 TEC • • Technical Information Report Lund Plat Water Quality (Part E) Treatment of runoff will not be required because none of the threshold drainage areas will have more than 5,000 square feet of new and replaced Pollution Generating Impervious Surfaces (PGIS). The following is a table summarizing the PGIS Surfaces proposed for each basin area. PGIS Areas by Basin North East West South !Lot 1l {Lot 2) ILots 3, 5, 6, Bl ILots 4, 7l Driveways 400 sf 400 sf 1,600 sf 800 sf Road Tracts 545 sf 2,859 sf Frontage Improvements 584 sf 3;928 sf Total 984 sf 4,873 sf 4,459 sf 800 sf SECTION 5 CONVEYANCE SYSTEM ANALYSIS AND DESIGN The conveyance piping was analyzed using the County's Backwater Analysis routine (BWPIPE) and runoff generated by KCRTS using 15-minute time steps to be sure the 25-year flows can be conveyed, and that significant flooding will not occur during a 100-year event. The results of this analysis are included in Appendix C. SECTION 6 SPECIAL REPORTS AND STUDIES In lieu of a Minor Floodplain Study, an engineering plan is submitted showing that the proposed building sites are located more than 2 feet above the downstream overflow elevation. This Engineering Plan is included in Appendix E. A Sensitive Areas Study was completed for the project site by Wetland Resources, Inc. This report is included in Appendix F. 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 The erosion control facilities are shown on the erosion control plan. The proposed detention pond will be used for a temporary sediment trap. At 960 square feet, the bottom area of the pond exceeds the top area required for the sediment trap, which is 685 square feet. The calculations (2,080 x Q2) used to size the erosion control facilities are included in Appendix C. SECTION 9 BOND QUANTITIES, FACILITY SUMMARIES, AND DECLARATION OF COVENANT Bond Quantities: The County's Bond Quantities Worksheet is included in Appendix G for the site and frontage improvements. 9 TEC ,-------- • • • Technical Information Report Lund Plat Facility Summaries: The County's Facilities Summary Sheet is included in Appendix E . Declaration of Covenant: The County's Declaration .of Covenant document will be provided separately. SECTION 10 OPERATIONS AND MAINTENANCE MANUAL The drainage facilities should be maintained as described in Appendix D (part of which was excerpted from the KCSWM Maintenance Requirements for Privately Maintained Drainage Facilities). The detention pond and all drainage and street work within public tracts, rights-of- ways and easements will become the property of King County . 10 TEC • • APPENDIX A FIGURES 1. Technical Information Report (TIR) Worksheet 2. Site Location Map 3. 4. Drainage Basins, Subbasins, & Site Characteristics SCS Soils Map • • • King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Project Owner /7 (Jtcund Address i;DaJ/ fii,ur/1, Jf ,Ebrl/J7!,-r 1 W1 9//ft,2 Phone ShtJ-'--(52 -JD/0 Project Engineer 1-orncc 7ijtoY ~ Short Subdivision Grading Commercial Other ________ _ Communny Drainage Basin , 7 1 1 ,a , D /{!,_crL ,,-, ver River Stream _________ _ Critical Stream Reach Depressions/Swales Lake __________ ~ Steep Slopes ________ _ Location Township --2,d. ___ _ Range_~::;-~---- ............. Section 2'7 IJ£ DFWHPA COE404 DOE Dam Safety FEMA Floodplain COE Wetlands Seeps/Springs Shoreline Management Rockery Structural Vaults Other High Groundwater Table Groundwater Recharge Other _________ _ Figure 1 TIR Worksheet (3 pages) !---------------- • • • Soil Type IIJ C Additional Sheets Attached REFERENCE Ch. 4 -Downstream Analysis Additional Sheets Attached MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION _.,.-Sedimentation Facilities _.--Stabilized Construction Entrance Yerimeter Runoff Control __,,clearing and Graing Restrictions __..-cover Practices ____. Construction Sequence Other Erosion Potential Erosive Velcoties LIMITATION/SITE CONSTRAINT MINIMUM ESC REQUIREMENTS AFTER CONSTRUCTION _.--Stabilize Exposed Surface ......--Remove and Restore Temporary ESC Facilities __..-Clean and Remove All Silt and Debris _.--Ensure Operation of Permanent Facilities ......-Flag Limits of SAO and open space preservation areas Other • • D Grass Lined D Tank Channel D Vault .® Pipe System D Energy Dissapator D Open Channel D Wetland ~ Dry Pond D Stream D Wet Pond D Infiltration D Depression D Flow Dispersal D Waiver D Regional Detention Method of Analysis /cC(t'J5 u,,'(/ 2 Compensation/Mitigati on of Eliminated Site Storage Brief Description of System Operation 16,noll'a.i//.,'t;fl~'o un C(jj. and ai,;ed Iv ddo,;luw aond ov /.a,,/c 11,,,h to dowrzskcun dJ-cb 6; j~, ~ I Facility Related Site Limitations Reference Facility D Cast in Place Vault D Retaining Wall D Rockery > 4' High D Structural on Steep Slope D Other Limitation 0 Drainage Easement !)!' Access Easement D Native Growth Protection Easement 0 Tract 0 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 . • • • Map Output Page I of I (®) King County IIE:mm m!'DIII Ci449i44¥ Comments M¥ii3,M he 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 not be liable for any general. special, indirect, incidental, or consequenttal damages including, but not limited to, ost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on his ma is rohibited exce t b written ermission of Kin Coun Kjng County 1 GIS Centfil I News ! Services I C_Q_n,m@ts 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 2 Site Location Map No Scale e e Map Output Page I of I ®King County 111rm-=-@§iiGi\.il Comments #i¥ii9,W iMAP -Sensitive Areas all themes) ;'ti Se:tet:;lad FoattJ:ft!$ 7 I' County Botmdatny ;,/ Stm• t& t----·; Patt.:St L...J Legend lnc.otpomted Am.a la.keg ;ar,d UugQ Ril{Qn1, /./ 'Topo C<>nl<l~"' (511! 1 he 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 lnot be liable for any general, special, indirect, incidental, or consequential damages including, but not limtted o, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. IAnv sale of this mao or information on this mao is orohibited exceot bv written oermission of Kina Countv. 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 3 Drainage Basins, Subbasins, & Site Characteristics Scale as shown URE Figure 4 SCS Soils Map 1" = 2,000' • e OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE SURFACE WATER DESIGN MANUAL, CORE REQUIREMENT #2 e Basin: Black River Snbbasin Name: Subbasin Number: · Symbol .· ·. . . Drainage. '., .. ··:., ' .. pr~i_11ast; :·. ''.':·, '~19P.f: .. [)i~!.a~ct:!; /~.iExi_st~JW{l-\ ·;·{Sf!?:?J~n!La~\-,:.:si f:t}lf?.!!le!Yii!!,q~-~.:~!:!i~.lpk~:i Component·Type, · , ·.v. ,.eomponent;.i;}:,, • .: .::,·.,, ·.from·site7·. 1·•.:P.roblems'.;;~, ""•Jl?roblems,.:,,. ":':". ;mspector,,re·sou~ce/;1':·~ -,:· .. """:•· .. • -;_ '.h,: •• ,~ := .,.s".',. ,''-:::-"-\ ··"' ~':'" .~ .-~ -,, .c,;4 '1 ",~ ;;j';: _.,. • "'··. •7-·3 --,...,.,.::. --~'f. --,,)/: ::..W-•f-1,; ,,t.:o.•~-' •dfk"'~'A• tr.~·'~)-~w-t,r,-, ~-< ~ }'~ __ .,r ... "-!"'"'::o:::;.. 10. •• ·, •• :-~ ·,a.":f'::f~ _ :-/ 0\Na_metand;S1ze ~: ... ~,-=..: ·Descr1ot1on :~ .. '/J.t.,, 1 ·.::;:.----:.. ,:-~ d1scharae~ r~::tJ:s.,1~~i;:i:r;;j93:'1.: 15t~~~i--~;>~1.:;,--H ~~"-·rev1ewer;:or:eres1dent:,::-.ci.L:l. s~e rl).~P '. : ~ JYP~.:.~h~e_f:ro~;i~\?-~J~i~h1 ;';~1rajj~g~ b~,stn;(~i_~Q~ta~~rift·: '~~:;: ·:~;+~} ;.:~q\nil,':]j;_~~ft:':~\ J~~~~P?.~~w.ctigrs'Lu.n~~rf~P~tyJf'2,.ry91~~t;.~'4?J! J~fttfi_J?pJ~tt8~jqli~Jlift?91}>@:tllg1~.rr~~~ , " I }16t11!:~:~~1:;~f:;\;;'., f ~~:1~t~f{1~J~t;\;:;i!:f R:p (:?;:\/~. ?l '.: 'f'~[Jt~ ~ii!~\i~1f i:f ll.tt,illliitD!iflt IJJftii~!~il~lf~i: North Downstream Drainage Path A-B I Ditch w/ 8" -12" I Dirt and grass lined driveway culverts ditch sections, I -2 feet cover B-C I Sheet flow I Dirt and grass storage C-D I Sheet flow j ~ard and Overland flow down to bottom of ravine South Downstream Drainage Path E-F 12" cone. d/w culvert and ditch system Grass lined ditch, depth varies. N side of SE 164th F-G I 12" cone. pipe I discharges to bottom of drainage ravine G-D I Large wetland/ I Headwaters of drainage drainage area path to NW West Downstream Drainage Path H-I (.J J-K K-D 98--4\inB04 Drainage swale, 2' - 8' wide 12" -18" -IO" pipe Drainage swale Large wetland/ drainage area Brushy and wooded Crosses under private property Down slope to bottom of drainage ravine Headwaters of drainage path to NW 2 O' -900' None noted 2 900' -1,270' I None noted 8 1,270' - l,540' 4 O' -1,270' I None noted 5 1,270' - 1,380' 2 1,380'- 1,700' 2 O' -800' I None noted 5 800' -1,330' 5 1,330'- ], 750' 2 I I,750'- 1,880' Ditch capacity is small, potential for floodim, Erosion and flooding erosion flooding Ditch appears to end at B and overtop to sheet flow across vacant storage xard Inaccessible on private property Inaccessible on private property Area has been used by adjacent property owners to dump yard waste and other debris Inaccessible on private Property Inaccessible on private property Inaccessible on private property • • ~• Map Output Page I of I (® King County lllmmmlll lllm'!III C144ili44A Comments C1¥il3,M he 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 not be liable for any general, special, indirect. incidental, or consequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on this map. Any sale of this map or information on his ma is rohibited exce I by written permission of Kin Count . ~ Coumy I GJSCenter I News I Servii::;es I CQ.mmellls 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 Downstream Drainage Paths Scale as shown httn· //www"i. mc,trnk c. Pov/.serv Jet /com .esri .esri man. Esriman?ServiceName=overview&Clie... 8/24/2005 • • Map Output Page I of I @ King County lllllll!m'IIII IEI!DII C'i4hi34W Comments W1¥H3,M ', l', .~'"'i;_,__-',---1.. he 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 not be liable for any general, special, indirect, incidental, or consequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuse of the information contained on !his map. Any sale of this map or information on his ma is rohibited except b written ermission of Kin Coun Kin.gj&unty_ I Glli_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 Upstream Tributary Basins Scale as shown httn-//v,;ww5 mietrok r. onv/sc,rvliet Ir.nm .<>sri .<esrinrnn. F.sriman?Service N ame=overview&c:lie... 8/24/2005 //1-~UJ[M(O) [P~IJ <lEI~$u~lM~ ~ijulE lffifA~ij~ !ffi(O)lUJlM!D)fA~ij~~ '/,...,.,./·· ,/ .,_~ ' . e e I "'"' "' '-:-:. ' .. ,.,-, ,., - . \::;: .. _':N;;:~--~r·:;,:·-·-·---·- '--:-".;.f.\L~"er' -·-:.: -1um 4 ve.-s.B. ·····-·"<, -::-·,~,::~----·----·----------------~~,--~---:.JI~]{!fff :~ ·:~~-· ,t~·C& " ,;,; .. ,_ ... ·~-'--··--- ___, -'"----,~---- .•; -":'-" --... ··-· ---..... . ~-. --·--· ...._ -----::2.--::._ _ _.~ _-;~2'/.~ -~ "~;,:;, ·-_-Y:~s;-·· .-.. :~.~-~--==---, . .,,.Jng·( ~--~· ~·, --/· ,. .... ,.,,.' ,,::::::::::=::.::::: -; .. -~ ! 1·1~· . ,_'\, ~ • ¥1·' i ·:i~1fj I "" 'Ol ' . . ',ij·'-s I . -,:,C,,----r '.d " i ' ~-i',: . ··.. . I;'.;.'~ 1-i .. .,.,:._ WEST ~-.. ··.· ! ti! 'f:·' .c, fill .,; ' p:~fr\--·-: . . . . • • ' \j' ' ···ill! . .. .. ,_-,, '---:. --'\""'' ·-----.. -. -~ -· .. ' l ';-1l . • . . · ,, . . . , . , ". . : ,, ~ • . 'c\' , . ~ .. . NOfl11::I . , , . . --{ '""" ' ' . ' ·I ',, ,. '.,·,,., ". . ' -' ·, ,, " F"·" ' ' ., ,._ ',, .. ,., ... -"' "'" .. , ,--. . ,, .. _ -~.. -. .;...+-~-·""' I ,<: ... ~,. ~--',, -y~;_::f;:;::i;\.: ;;:-. ·-om'""~ , ~ r"··----. FOREST: IMPERVIOUS: PASTURE: NORTH BASIN (AC) SITE STREET 16,716 (0.38) 1,224 (0.03) 2,519 (0.06) 2,429 (0.06) TOTAL 16,716 (0.38) 3,743 (0.09) 2,429 (0.06) EAST BASIN (AC} SITE STREET 8,007 (0.18) 1,292 (0.03) 11,252 (0.26) 4,394 (0.10) 10,917 (0.25) TOTAL 8,007 (0.18) 12,544 (0.29) 0 ,o 80 15,311 (0.35) I \ l 431 (0.01) WETLAND: 431 (0.01) SCALE: I" ; 80 TOTAL: 18,050 (0.41) 4,948 (0.11) 22,998 (0.53) 14,124 (032) 22,169 (0.51) 36,293 (0.83) WEST BASIN (AC) SOUTH BASIN (AC) TOTALS (AC) SITE SITE STREET TOTAL SITE STREET TOTAL FOREST: 4,194 (0.10) 28,917 (0.66) 28,917 (0.66) IMPERVIOUS: 2,036 (0.05) 4,552 (0.10) 13,771 (0.32) 18,323 (0.42) PASTURE: 24,682 (0.57) 20,543 (0.47) 1,464 (0.03) 22,007 (0.51) 49,619 (1.14) 14,810 (0.34) 64,429 (1.48) WETLAND: 289 (0.01) 5,365 (0.12) 104 (0.00) 5,469 (0.13) 6,085 (0.14) 104 (0.00) 6,189 (0.14) TOTAL: l (31,201JQ]2)J 25,908 (0.59) 1,568 (0.04) 27,476 (0.63) 89,173 (2.05) 28,685 (0.66) 117,858 (2.71) • SOME AREAS SHOW "ROUND-OFF" ERROR ft. zEB ~ Lot Coverage Areas Project: Date: ( Forest · I lmJ)elViouS ~ · Pasture .. [ [ Grass Wetland Total Forest Impervious P.asture: - Grass Wetland Total Lund Plat 1/10/2006 ExistinJL Site (sfl I (acl 16,716 0.38 1,224 0.03 18,050 0.41 Pro.e_osed Site (sfl I Jae 4,804 0.11 12,021 0.28 16,825 0.39 North Basin Frontaae (sfl I (ac' 2,519 0.06 2,429 0.06 4,948 0.11 North Basin Frontaae fsfl I lac 3,037 O.D7 1,911 0.04 4,948 0.11 Z:\JOBS\281-PLS\reports\Drainage Cales.xis 1/10/2006 East Basin Total Site Frontane (sfl I lacl tsfl I tac tsfl I lac 16,716 0.38 8,007 0.18 3,743 0.09 1,292 0.03 11,252 0.26 2,429 0.06 4,394 0.10 10,917 0.25 431 0.01 22,998 0.53 14,124 0.32 22,169 0.51 East Basin Total Site Frontaae fsfl I (ac fsfl I lac lsfl I (ac 7,841 0.18 2,560 0.06 16,212 0.37 13,932 0.32 6,751 0.15 6,467 0.15 21,773 0.50 9,311 0.21 22,679 0.52 ~ • West Basin South Basin Totals Total Site Site Frontaae Total Site Frontaae Total lst1 I (ac (sfl I tac] lsfl I (acl (sfl I (acl (sfl · I lac lsfl I lac' -/sf\ -i lacl lsfl Tiaci 8,007 0.18 4,194 0.10 28,917 0.66 28,917 0.66 12,544 0.29 2,036 0.05 4,552 0.10 13,771 0.32 18,323 0.42 15,311 0.35 24,682 _0.57 20,543 0.47 1,464 0.03 22,007 0.51 49,619 1.14 14,810 0.34 64,429 1.48 431 0.01 289 0.01 5,365 0.12 104 0.00 5,469 0.13 6,085 0.14 104 0.00 6,189 0.14 36,293 0.83 31,201 0.72 25,908 0.59 1,568 0.04 27,476 0.63 89,173 2.05 28,685 0.66 117,858 2.71 West Basin South Basin Totals Total -· Site Site Frontaae Total Site Fronta1'1e Total (sfl I (ac' -15t1 I tac· tsf'I l tac· tsfl I tac' lsfl I tac, tsfl I tac j5f\ 1 tacl tsfl I lac' 18,772 0.43 17,726 0.41 7,049 0.16 7,049 0.16 32,139 0.74 19,249 0.44 51,388 1.18 11,027 0.25 11,027 0.25 11,027 0.25 11,027 0.25 13,218 0.30 21,977 0.50 954 0.02 954 0.02 40,749 0.94 9,332 0.21 50,081 1.15 5,365 0.12 104 0.00 5,469 0.13 5,365 0.12 104 0.00 5,469 0.13 31,990 0.73 39,703 0.91 23,441 0.54 1,058 0.02 24,499 0.56 89,280 2.05 28,685 0.66 117,965 2.71 • l UJJ 00 [D:) [pJ l/A\ 'ii' 1 00 (0) [Ptl'jj' ~ lffi IA\~ ~ 00} • .::::------~ .1 -r _ 1 _ !_ I I -··-------------------.:..._. ___ a:__~--------'""""·""·"·;..\i::.:.ti._il.;a) ,,,, ,., .. _ !i I ,__ __ _ , .... '"'"""""' ~""J""-"' ';, ;,nJ.' ... ,.\.1 ,,,.,, '~" liE~l----..-'~::r-·,-.-.----.,-,-_, . .,. . ..,...._....,..~~-::':::.'.;.'.;:~~---.--·--··" ~ 1 , . \· -..... _.,... '~--._ ..... ,,. :/ l -~. ,;,, ...... '""' ("" ~-•I•\ ~ -:;;;::a-' I ssi11'(Cl \~ ~-.,._, __ , ---"'""'''·'/ -r ,,...,.,-,.:;-,-= I -:·---. -} ?1 / I I ,/ {'" \ I '/ J ~ 'L I ~ 8 \-, --1 ; ·i ~ ti,j n ; \, -/' , • I~ i!! ----~-~~ :1r1~ ~ I -_.. ~A,l . 7Sf . j')--. ____, ~---~~ . l"~·t :I f; .. I C .•• 'I --HJ-.. , ..J • ~ ~ .\;' :,;~ I a ,,,::-']TI>,! NJx,!J.JT""-il, Ill LOU ",=1.1\~ .d'."I'·, Jl::1'• -, ! ! i) /~/'''! IJ1/SS I · ·' i i I :::.::._J -11------1'"< .. ;~/ J '-\ffl'L ~--:r1_z-:-.-,-'l'-"-/'-'+'--_.=f!:!kl'Jsh,,,.i,.;,.,lill/\ Af"-. +,-;,-~;# · , .,·' , I~.! J j = .... --~~··;,~~~~·:·.~:·e::~~:i~~;::r~ir-~;;~~~[i£+[~::,::.: PROPOSED: SI TE SF (AC): STREET SF (AC): FOREST: IMPERVIOUS: 4,804 (0.11) 3,037 (0.07) PASTURE: GRASS: 12,021 (0.28) 1,911 (0.04) TOTAL: 16,825 (0.39) 4,948 (0.11) *SOME AREAS SHOW "ROUND-OFF" ERROR *ROQF AND D /W'S: (75% OF LOT AREA OR 4,000 SF -WHICHEVER IS LESS) *PGIS AREA = 984 SF < 5,000 SF (ROAD WlDENING & DRIVEWAY) TQTAL SF (AC): 7,841 (0.18) 13,932 (0.32) 21,773 (0.50) 0 I SCALE: 40 80 ~ 1" = 80 ft. zE9 • L~~[O) [P)L~ll ~~~ lffi~~~~} __, -, PROPOSED: SITE SF (t,C): FOREST: IMPERv10US: 2,560 (0.06) PASTURE: GRASS: 6,751 (0.15) WETLAND: TOTAL: 9,311 (0.21) 'SOME AREAS SHOW "ROUND-OFF" ERROR 'PGIS AREA = 4,873 SF < 5,000 SF (ROAD WIDENING & DRIVEWAYS) I J__ I _J _I BY-PASS: STREEI SF (AC); TOTAL SF (A(;): STREU SF (AC): 11,571 (0.27) 14,131 (0.33) 4,641 (0.10) 6,130 (0.14) 12,881 (0.29) 337 (0.01) 17,701 (0.41) 27,012 (0.62) 4,978 (0.11) • 0 40 80 I i : SCALE: 1" = 80 tt. zE9 • • • KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location: Sea-Tac exist.tsf 1. 00 Computing Series Regional Scale Factor : Data Type : Reduced Creating Hourly Tiffie Series File Till Forest Till Pasture Wetland Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60R.rnf O. 18 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STTP60R.rnf 0.35 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STWL60R.rnf 0.01 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf 0.29 acres Total Area 0.83 acres Peak Discharge: 0.193 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series File:exist.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Conunand Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:exist.tsf Flow Frequency Analysis Time Series File:exist.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:exist.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac C' _ ~<k--/}_ ' Computing Series : dev.tsf ~, ~~ Regional Scale Factor : 1. 00 Data Type : Reduced Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf Till Grass O. 29 acres Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf 0.33 acres Total Area 0.62 acres Peak Discharge: 0.217 CFS at 6:00 on Jan 9 in Year 8 Storing Time series File:dev.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module • e • Analysis Tools Command Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:dev.tsf Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:dev.pks Analysis Tools Cormnand RETURN to Previous Menu KCRTS Command CREATE a new Time Series Project Location : Production of Sea-Tac bypass.tsf Computing Series Regional Scale Factor : 1. 00 Reduced Data Type : Creating Hourly Time Series File Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTG60R.rnf 0.01 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf 0.10 acres Total Area 0.11 acres Peak Discharge: 0.049 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series File:bypass.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:bypass.tsf Flow Frequency Analysis Time Series File:bypass.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:bypass.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command exit KCRTS Program • e sum.txt Lund Plat -East Basin (114th Ave.) Runoff calculations 12/30/05 Flow Frequency Analysis Time series File:exist.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 0.098 5 2/09/01 2: 00 0.193 1 100.00 0.990 0.074 7 1/05/02 16:00 0.114 2 25.00 0.960 0.114 2 2/27 /03 7:00 0.106 3 10.00 0.900 0.074 8 8/26/04 2:00 0.104 4 5.00 0.800 0.089 6 10/28/04 16:00 0.098 5 3.00 0.667 0.104 4 1/18/06 16:00 0.089 6 2.00 0. 500 0.106 l 10/26/06 0:00 0.074 7 1. 30 0.231 0.193 1 1/09/08 6:00 0.074 8 1.10 0.091 computed Peaks 0.167 50.00 0.980 Flow Frequency Analysis Time series.File:dev.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 0.106 5 2/09/01 2:00 0.217 1 100.00 0.990 0.084 8 1/05/02 16:00 0.128 2 25 .00 0.960 0.128 2 2/27/03 7:00 0.127 l 10.00 0.900 0.088 7 8/26/04 2:00 0.112 4 5.00 0.800 0.106 6 10/28/04 16:00 0.106 5 3.00 0.667 0.112 4 1/18/06 16: 00 0.106 6 2.00 0.500 0.127 3 10/26/06 0:00 0.088 7 1.30 0.231 0.217 1 1/09/08 6:00 0.084 8 . 1.10 0.091 computed Peaks 0.188 50.00 0.980 , Flow Frequency Analysis Time'series File:bypass.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 0.025 7 2/09/01 2:00 0.049 1 100.00 0.990 0.022 8 1/05/02 16:00 0.036 2 25.00 0.960 0.031 l 12/08/02 18:00 0.031 l 10.00 0.900 0.025 6 8/26/04 2:00 0.030 4 5.00 0.800 0.030 4 10/28/04 16:00 0.027 5 3.00 0.667 0.027 5 1/18/06 16:00 0.025 6 2.00 0.500 0.036 2 10/26/06 0:00 0.025 7 1. 30 0. 231 0.049 1 1/09/08 6:00 0.022 8 1.10 0.091 computed Peaks 0.045 50.00 0.980 Flow Frequency Analysis Time series File:dev15.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 0.157 6 8/27/01 18:00 0. 536 1 100.00 0.990 0.117 8 1/05/02 15:00 o. 361 2 25.00 0.960 0.361 2 12/08/02 17:15 0.225 3 10.00 0.900 0.127 7 8/23/04 14:30 o. 223 4 5.00 0.800 o. 225 3 11/17/04 5:00 0.195 5 3.00 0.667 0.195 5 10/27/05 10:45 0.157 6 2.00 0.500 0.223 4 10/25/06 22: 45. 0.127 7 1.30 0.231 o. 536 1 1/09/08 6: JO 0.117 8 1.10 0.091 computed Peaks 0.478 SO.OD 0.980 Level 2 oet. Tank (4' deep) Int. size a [0.167-(0.089*0.50)/(36-1) • 0.004 1st Int. a 0.089*0.5 = 0.04 Ht. of Orif. (2) -3/4*3.5 = 2.63 Q(max) (1) = (4/3*0.04)-0.027 = 0.026 EC sed. Trap• 2,080*Q(2) • 2,080*0.157 = 327 sf Page 1 • • • Lund Plat -East Basin (114th Ave.) Retention/Detention Facility Sizing 12/30/05 Retention/Detention Facility Type of Facility: Tank Diameter: Tank Length: Effective Storage Depth: Stage O Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Detention-T"ahk • . 4.00. 1ft 98. lft 3. 0 ft o':"oo-'tt-4G.i. 79 1143. cu. ft 3.50 ft f:iir2~00-f0Clies ~~--A : . ..:::.---Full Head Pipe Orifice ff Height Diameter 1 6 ~~b (;~[i1s;7 Discharge (CFS) 0.039 0.045 Diameter (in) 2 1.80 ~(13 Top Notch Weir: Non~ Outflow Rating Curve: None Stage (ft) 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.17 0.27 0.37 0.47 0.57 0. 67 0.77 0.87 0.97 1. 07 1.17 1. 27 1. 37 1. 47 1. 57 1. 67 1. 77 1.80 1. 81 1. 82 1. 84 1. 85 1. 86 1. 87 1. 88 1.89 1. 99 2.09 2.19 2.29 2.3_9 2.49 2.59 2. 69 2.79 2.89 Elevation (ft) 0.00 0.01 0. 02 0. 03 0.04 0.05 0.06 0.07 0 .17 0.27 0.37 0.47 0.57 0. 67 0.77 0.87 0. 97 1. 07 1.17 1. 27 1. 37 1. 47 1. 57 1. 67 1. 77 1. 80 1. 81 1. 82 1. 84 1. 85 1. 86 1. 87 1. 88 1. 89 1. 99 2.09 2.19 2.29 2.39 2.49 2.59 2. 69 2.79 2.89 (CU. Storage ft) (ac-ftl 0. 0.000 3. 0.000 5. 0.000 8. 0.000 11. 13. 1_6. 19. 47. 77. 109. 142. 176. 211. 247. 284. 322. 360. 398. 437. 476. 515. 554. 594. 632. 644. 64 8. 652. 660. 663. 667. 671. 675. 679. 717. 755. 792. 828. 864. 899. 932. 964. 995. 1024. 0.000 0.000 0.000 0.000 0.001 0.002 0.002 0.003 0.004 0.005 0.006 0.007 0.007 0.008 0.009 0.010 0. 011 0.012 0.013 0.014 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.015 0.016 0.016 0.017 0.018 0.019 0.020 0.021 0.021 0.022 0.023 0.024 4.0 Discharge {cfs) 0.000 0.002 0.003 0. 003 0.004 0. 005 0.005 0. 006 0.009 0. 011 0.013 0.014 0.016 0. 017 0.018 0. 020 0.021 0.022 0.023 0.024 0. 025 0.025 0.026 0.027 0.028 0.028 0.029 0.029 0.031 0.033 0.035 0.038 0.039 0.040 0.045 0.049 0.053 0.056 0.059 0.062 0.065 0.067 0.070 0.072 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 0.00 0.00 0.00 0.00 • • Hyd l 2 3 4 5 6 7 8 2.99 3.09 3.19 3.29 3.39 3. 49 3.50 3.60 3.70 3.80 3.90 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 Inflow 0.22 0 .13 0.13 0 .11 0.11 0 .11 0.09 0.08 2.99 3.09 3.19 3.29 3.39 3.49 3.50 3. 60 3.70 3.80 3. 90 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 Outflow 0.22 0.08 0.09 0.09 0.08 0.06 0.03 0.03 1051. 1076. 1099. 1118. 1133. 1142. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. 1143. Peak Stage 3.54 3.36 3.50 3.50 3 .16 2 .37 l. 65 1.85 0.024 0.025 0.025 0 .026 0. 026 0.026 0.026 0. 026 0. 026 0. 026 0.026 0 .026 0.026 0. 026 0.026 0. 026 o. 026 0.026 0. 026 0.026 0.026 0. 026 0. 026 0.026 0.026 0. 026 0. 026 Elev 3.54 3.36 3.50 3.50 3 .16 2.37 l. 65 l. 85 0.074 0.076 0.078 0.080 0.082 0.084 0.084 0.394 0.959 l. 690 2.480 2.770 3.020 3.260 3. 480 3.690 3.880 4.070 4.250 4.420 4.580 4.740 4.890 5.040 5.190 5.330 5. 460 Storage 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 (Cu-Ft) (Ac-Ft) 1143. 0.026 1129. 0.026 1143. 1143. 1091. 857. 586. 665. 0. 026 0.026 0.025 0.020 0.013 0.015 Hyd l 2 R/D Facility Tributary Reservoir POC outflow 3 4 5 6 7 8 Outflow 0.22 0.08 0.09 0.09 0.08 0.06 0.03 0.03 Inflow 0.05 0.03 0.04 0.03 0.02 0.03 0.03 0.02 Inflow ******** ******** ******** ******** ******** ******** ******** 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: 0. 217 CFS Peak Outflow Discharge: 0.218 CFS Peak Reservoir Stage: 3.54 Ft Peak Reservoir Elev: 3.54 Ft Target Cale 0.19 0.26 ******* 0.10 ******* 0.12 ******* 0.11 ******* 0.10 ******* 0.08 ******* 0.04 ******* 0.05 at 6:00 on Jan at 7:00 on Jan Peak Reservoir Storage: 1143. Cu-Ft 0.026 Ac-Ft Add Time Series:bypass.tsf 9 in 9 in Year 8 Year 8 Peak Surmned Discharge: 0.263 CFS at 7:00 on Jan 9 in Year 8 Point of Compliance File:dsout.tsf Flow Duration from Time Series File:rdout.tsf . Cutoff Count Frequency CDF Exceedence Probability CFS % % % 0.001 48720 79.452 79.452 20.548 0.205E+OO 0.004 5362 8.744 88 .196 11. 804 0.118E+OO 0.006 1772 2.890 91. 086 8.914 0. 891E-01 0.009 1437 2.343 93.430 6.570 0.657E-01 0.012 1251 2.040 95.470 4.530 0.453E-01 0.014 943 1. 538 97.007 2.992 0.299E-Ol 0 .017 558 0.910 97. 917 2.083 0.208E-01 0.019 369 0.602 98.519 1. 481 0.148E-01 0.022 267 0.435 98.955 1. 045 0.105E-01 0.024 236 0.385 99.340 0.660 0.660E-02 0.027 171 0.279 99.618 0.382 0.382E-02 0.030 66 0.108 99.726 0.274 0.274E-02 0.032 6 0.010 99.736 0.264 0.264E-02 0.035 10 0.016 99.752 0.248 0.248E-02 0.037 8 O. 013 99. 765 0.235 0.235£-02 0.040 10 0.016 99.781 0.219 0.219E-02 0.042 18 0. 029 99.811 0.189 0.189E-02 0.045 12 0.020 99.830 0.170 0, 170E-02 0.047 12 0.020 99.'850 0.150 O.lSOE-02 0. 0_50 ·8 0.013 99.863 0.137 0.137E-02 0.053 9 0.015 99. 878 0.122 0.122E-02 0.055 9 0.015 99.892 0.108 0.108E-02 0.058 7 0. 011 99.904 0. 096 0.962E-03 0.060 11 0.018 99.922 0.078 0.783E-03 0.063 10 0.016 99.938 0. 062 0.620E-03 0.065 6 0.010 99.948 0.052 0.522E-03 0. 068 7 0. 011 99.959 0.041 0.408E-03 0.071 3 0.005 99.964 0.036 0.359E-03 0.073 5 0.008 99. 972 0.028 0.277E-03 0.076 5 0.008 99.980 0.020 0 .196E-03 0.078 5 0.008 99.989 o. 011 0.114E-03 0.081 2 0.003 99.992 0.008 O.SlSE-04 0.083 3 0.005 99.997 0.003 0.326E-04 0. 086 0 0.000 99.997 0.003 0.326E-04 0.088 1 0.002 99.998 0.002 0.163E-04 • 0.091 0 0.000 99.998 0.002 0.163E-04 Flow Duration from Time Series File: dsout. tsf Cutoff Count Frequency CDF Exceedence Probability CFS • % ' 0.002 49479 80.690 80.690 19.310 0.193E+OO 0.005 4703 7.670 88.359 11.641 0 .116E+OO 0.008 1864 3.040 91. 399 8.601 0.860E-01 0.011 1417 2 .311 93.710 6.290 0.629E-01 0.015 1261 2.056 95.766 4. 234 0.423E-01 0.018 784 1.279 97.045 2.955 0.295E-01 0.021 562 0. 917 97. 962 2.038 0.204E-01 0.024 389 0. 634 98. 596 1. 404 0. l '10E-01 0.028 297 0.484 99.080 0.920 0.920E-02 0.031 173 0.282 99.362 0.638 0.638E-02 0.034 113 0.184 99.547 0.453 0. 453E-02 0.037 55 0.090 99.636 0. 364 0.364E-02 0.041 36 0.059 99.695 0.305 0.305E-02 0.044 27 0.044 99.739 0.261 0. 2 61E-02 0.047 13 0.021 99.760 0.240 0.240E-02 0.050 24 0.039 99.799 0.201 0.201E-02 0.054 14 0.023 99.822 0.178 0.178E-02 0.057 13 0.021 99.843 0.157 0.157E-02 0.060 12 0.020 99.863 0.137 0.137E-02 0.063 6 0.010 99.873 0.127 0.127E-02 0 .067 9 0.015 99.887 0.113 0.113E-D2 0.070 8 0. 013 99.901 0.099 0.995E-03 0.073 10 0.016 99. 917 0.083 0.832E-03 0. 076 9 0.015 99.932 0. 068 0.685£-03 0.080 10 0.016 99.948 0.052 0.522E-03 0.083 5 0.008 99.956 0.044 0.440E-03 0.086 6 0.010 99.966 0.034 0.342£-03 0.089 2 0.003 99.969 0.031 0.310E-03 • 0.093 4 0.007 99.976 0.024 0.245E-03 0.096 7 0. 011 99.987 0.013 0 .130E-03 0.099 2 0.003 99.990 0.010 0.978E-04 ----------------------------- • • • 0.1102 3 0.005 99.995 0.106 0 0.000 99.995 0.109 2 0.003 99.998 0.112 0 0.000 99.998 0.115 0 0.000 99.998 Duration Comparl'.son Anaylsis Base File :/e'~~S~)J ;, New File:: dsdu't\itsi:\, Cutoff Units:'D2;.t~~arge in CFS 0.005 0.489E-04 0.005 0.489E-04 0.002 0 .163E-04 0.002 0 .163E-04 0.002 0.163E-04 -----Fraction of Time--------------Check of Tolerance------- Cutoff Base New %Change Probability 0. 046 0.29£-02 0.24E-02 -14.8 I 0.29E-02 0.051 0. 22E-02 0.19E-02 -11. 3 I 0.22£-02 0.056 0. 17E-02 0.16£-02 -3.9 I 0.17E-02 0. 062 0.13E-02 0.13E-02 5.1 I 0 .13£-02 0. 067 O.lOE-02 O.llE-02 9.7 I 0. lOE-02 0 .072 0.70E-03 0.85E-03 20.9 I 0.70E-03 0.078 0.49E-03 0.65£-03 33.3 I 0.49E-03 0.083 0.34E-03 0.44£-03 28.6 I 0.34E-03 0.088 0.2BE-03 0.31£-03 11. 8 I 0.28E-03 0.093 0.16E-03 0.21E-03 30.0 I 0.16E-03 0.099 0.82E-04 0. llE-03 40.0 I 0.82E-04 0.104 0.82E-04 0.49E-04 -40.0 I 0.82E-04 0 .109 0.16E-04 0.16E-04 0.0 I 0.16£-04 Maximum positive excursion~ 0.010 cfs (~, occurring at 0.106 cfs on the Base Data:'eil"st.tsf and at 0.116 cfs on the New Data:dsout.tsf Maximum negative excursion= 0.004 cfs ( -9.3%) occurring at 0.046 cfs on the Base Data:exist.tsf and at 0.042 cfs on the New Data:dsout.tsf 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: 0. 217 Peak Outflow Discharge: 0.218 Peak Reserv'oir Stage: 3.54 Peak Reservoir Elev: 3.54 Peak Reservoir Storage: 1143. 0.026 Add Time Series:bypass.tsf CFS at 6,00 CFS at 1,00 Ft Ft Cu-Ft Ac-Ft Base New %Change 0. 046 0.042 -9.0 0.051 0.049 -3.8 0.056 0.056 -0.9 0. 062 0 .063 2.9 0.067 0.070 4 .2 0.072 0.076 4.6 0.078 0.081 4 .5 0.083 0.086 4 .0 0.088 0.091 3.0 0.093 0.095 1. 9 0.099 0.099 0.8 0.104 0.099 -4. 3 0.109 0 .116 6.5 on Jan 9 in Year 8 on Jan 9 in Year B Peak Summed Discharge: 0.263 CFS at 7:00 on Jan 9 in Year 8 Point of Compliance File:dsout.tsf Flow Duration from Time Series File:rdout.tsf Cutoff Count Frequency CDF Exceedence Probability CFS • % • 0.001 48720 79.452 79. 452 20.548 0.205E+OO 0.004 5362 8.744 88.196 11. 804 0. llBE+OO 0.006 1772 2.890 91. 086 8.914 0.891E-01 0.009 1437 2.343 93.430 6.570 0.657E-01 0. 012 1251 2.040 95.470 4.530 0.453E-01 0.014 943 1.538 97.007 2. 992 0.299E-01 0.017 558 0.910 97. 917 2.083 0.208E-01 0.019 369 0.602 98.519 1. 481 0.148E-01 0.022 267 0.435 98.955 1.045 O.lOSE-01 0.024 236 0.385 99.340 0.660 0.660E-02 0.027 171 0.279 99.618 0.382 0. 382£-02 0.030 66 0.108 99.726 0.274 0.274E-02 0.032 6 0.010 99.736 0.264 0. 264£-02 0.035 10 0.016 99.752 0.248 0.248E-02 0.037 8 0.013 99. 765 0.235 0. 235E-D2 0.040 10 0.016 99.781 0.219 0.219E-02 0.042 18 0.029 99. 811 0.189 0.189E-02 • 0.045 12 0.020 99.830 0.170 0.170E-02 0.047 12 0.020 99.850 0.150 O.lSOE-02 0.050 8 0. 013 99.863 0 .137 0.137E-02 0.053 9 0.015 99.878 0.122 D.122E-02 0.055 9 0.015 99. 892 0.108 0.108E-D2 0.058 7 0.011 99.904 0.096 0.962E-03 0. 060 11 0.018 99.922 0.078 0. 783E-03 0. 063 10 0.016 99.938 0.062 0.62DE-03 0.065 6 0.010 99.948 0.052 0.522E-03 0.068 7 0. 011 99.959 0.041 0. 408E-03 0.071 3 0.005 99.964 0.036 0.359E-03 0.073 5 0.008 99. 972 0.028 0.277E-D3 0. 076 5 0.008 99.980 0.020 0.196E-03 0.078 5 0.008 99.989 0. 011 0 .114E-03 0.081 2 0.003 99.992 0.008 0.815E-04 0.083 3 0.005 99.997 0.003 0. 326E-04 0.086 0 0.000 99.997 0.003 0. 326E-04 0.088 1 0.002 99.998 0.002 0.163E-04 0.091 0 0.000 99.998 0.002 0 .163E-04 Flow Duration from Time Series File:dsout.tsf Cutoff Count Frequency CDF Exceedence Probability CFS % % % 0.002 49479 80.690 80.690 19. 310 0.193E+OO 0.005 4703 7.670 88.359 11. 641 0 .116E+OO 0.008 1864 3.040 91.399 8.601 0.860E-01 0. 011 1417 2. 311 93.710 6.290 0.629E-01 0.015 1261 2.056 95.766 4.234 0.423E-01 0.018 784 1. 279 97.045 2.955 0.295E-01 0.021 562 0. 917 97.962 2.038 0.204E-01 0.024 389 0.634 98.596 1. 404 0.140E-01 0.028 297 0.484 99.080 0.920 0. 92DE-02 0.031 173 0.282 99.362 0.638 0.638E-02 0.034 113 0.184 99.547 0.453 0. 453E-02 • 0.037 55 0.090 99.636 0.364 0.364£-02 0. 041 36 0.059 99.695 0.305 0.305E-02 0. 04 4 27 0.044 99.739 0.261 0.261E-02 0.047 13 0.021 99.760 0.240 0.240E-02 0.050 24 0.039 99.799 0.201 0.201E-02 0.054 14 0.023 99.822 0.178 0 .178E-02 0.057 13 0.021 99.843 0.157 0 .157E-02 0.060 12 0.020 99. 8 63 0 .137 0. 137E-02 0 .063 6 0.010 99.873 0 .127 0. 127E-02 0 .067 9 0.015 99.887 0 .113 0 .113E-02 0.070 8 0.013 99.901 0. 099 0.995E-03 0.073 10 0.016 99.917 0.083 0.832E-03 0.076 9 0.015 99.932 0 .068 0.685E-03 0.080 10 0.016 99.948 0.052 0.522E-03 0.083 5 0.008 99.956 0.044 0.440E-03 0.086 6 0.010 99.966 0.034 0.342E-03 0.089 2 0.003 99. 969 0.031 0.310E-03 0.093 4 0.007 99.976 0.024 0.245E-03 0.096 7 0. 011 99.987 0.013 0.130E-03 0.099 2 0.003 99.990 0.010 0.978E-04 0.102 3 0.005 99.995 0.005 0.489E-04 0.106 0 0.000 99.995 0.005 0.489E-04 0.109 2 0,003 99.998 0.002 0.163E-04 0.112 0 0.000 99.998 0.002 0.163E-04 0.115 0 0.000 99.998 0.002 0.163E-04 • • -Cf) LL (.) --(]) e> -tJ) 0 0 • 0 \ ;;-+--------f_;""\ _________ _ -~ (' ~ R , <D 0 0 oo ____ _ b ' ' tj ' ,· rdout.dur o · 1:~_o~u(d~j · •1 target.dur o N 0•-+--------------------~--"----------- 0 ~ '<>-., ~ ''\~ (~ .00 ~ ,_.,. o-l--'oL..,c--~~m~-~~~~~-~~~~~~-~~~~~--9.:;,c._~~~~ I I I 1111 I I I I 1111 I I I I 1111 I I I I 1111 I I I 1111 10 -4 10 -J 10 -2 10 -1 10° Probability Exceedence • [L [UJ ~ [O) [p) [Lffel 1i' ,\WI [E $ 'ii' [ffi ffel $ ~ ~] • ____, l --, FOREST: IMPERVIOUS: PASTURE: GRASS: TOTAL: PROPOSED: SI TE SF {AC): 17,726 (0.41} 21,977 (0.50} 39,703 (0.91} •"GRASS" INCLUDES LAWN AREA FROM LOTS 4 AND 7 *SOME AREAS SHOW "ROUND-OFF" ERROR *ROOF AND D /WS: (75% OF LOT AREA OR 4,000 SF -WHICHEVER IS LESS) *PGIS AREA = 4,459 SF < 5,000 SF (DRIVEWAYS & ACCESS TRACT} l 0 I SCALE: 40 80 ~ 1" = 80 fl 2E9 • • • • Project Location : Computing Series Regional Scale Factor : KCRTS Command CREATE a new Time Series Production of Runoff Time Series Sea-Tac exist.tsf 1. 00 Data Type : Reduced Creating Hourly Time Series File Till Forest Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60R.rnf 0.09 acres Till Pasture Wetland Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STTP60R.rnf 0.57 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STWL60R.rnf 0.01 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf 0.05 acres Total Area Peak Discharge: 0.100 (o.n·~~res crs-at-· 6: 00 on Jan 9 in Year 8 Storing Time Series File:exist.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:exist.tsf Flow Frequency Analysis Time Series File:exist.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:exist.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac Computing Series dev.tsf Regional Scale Factor : 1. 00 Data Type : Reduced Creating Hourly Time Series File Till Grass Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf 0.50 acres Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60R.rnf 0.41 acres Total Area Peak Discharge: 0. 2 99 t o. 91 CFS .... at acres 6:00 on Jan 9 in Year 8 Storing Time Time series Computed KCRTS Command Enter the Analysis TOOLS Module Series File:dev.tsf r -• • • • Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac Loading Stage/Discharge curve:dev.tsf Frequencies & Peaks saved to File:dev.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command eXit KCRTS-Program sum.txt Lund Plat -west Basin Runoff calculations • 4/4/06 ~W-tsf Flow Frequency Analysis Time series File:exist.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 0.055 2 2/09/01 15:00 0.100 1 100.00 0.990 0.027 7 1/05/02 16:00 0.055 2 25.00 0.960 0.054 3 2/27/03 7:00 0.054 3 10.00 0.900 0.015 8 8/26/04 2:00 0.051 4 5.00 0.800 0.031 6 1/05/05 8:00 0.049 5 3.00 0.667 0.051 4 1/18/06 16:00 a.on-6 2.00 o. 500 0.049 5 11/24/06 4:00 0.027 7 1. 30 0.231 0.100 1 1/09/08 6:00 0.015 8 1.10 0.091 computed Peaks 0.085 50.00 0.980 Flow Frequency Analysis fa# Time series File:dev.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 0.144 5 2/09/01 2:00 o. 300 1 100.00 0.990 0.110 8 1/05/02 16:00 0.175 2 25.00 0.960 0.175 2 2/27/03 7:00 0.162 3 10.00 0.900 0.112 7 8/26/04 2:00 0.152 4 5.00 0.800 0.136 6 10/28/04 16:00 0.144 5 3.00 0.667 0.152 4 1/18/06 16:00 0.136 6 2.00 0.500 0.162 3 10/26/06 0:00 0.112 7 1.30 0.231 o. 300 1 1/09/08 6:00 0.110 8 1.10 0.091 computed Peaks 0.258 50.00 0.980 • Flow Frequency Analysis Time series File:devl5.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 0.195 6 8/27/01 18:00 0. 736 1 100.00 0.990 0.152 8 1/05/02 15:00 0.479 2 25.00 0.960 0.479 2 12/08/02 17:15 o. 324 3 10.00 0.900 0.157 7 8/23/04 14: 30 0.281 4 5.00 0.800 0.324 3 11/17/04 5:00 0.251 5 3.00 0.667 0.251 5 10/27/05 10:45 0.195 6 2.00 o. 500 0.281 4 10/25/06 22:45 0.157 7 1. 30 0.231 o. 736 1 1/09/08 6:30 0.152 8 1.10 0.091 computed Peaks 0.651 50.00 0.980 = 408 sf • Page 1 • Retention/Detention Facility Type of Facility: Detention Pond Side Slope: 2.50 H: lV Pond Bottom Length: 71. 89 ft Pond Bottom Width: 25.31 ft Pond Bottom Area: 1820. sq. ft Top Area at 1 ft. FB: 4164. sq. ft 0.096 acres Effective Storage Depth: 3.00 ft Stage O Elevation: 0.00 ft Storage Volume: 7872. cu. ft 0.181 ac-ft Riser Head: 3.00 ft Riser Diameter: 12.00 inches Number of orifices: 2 Full Head Pipe Orifice # Height Diameter Discharge Diameter (ft) (in) (CFS) (in) 1 o.oo 0. 71 0.024 2 2.00 0.68 0.013 4.0 Top Notch weir: None Outflow Rating Curve: None Stage Elevation Storage Discharge Percolation Surf Area (ft) (ft) (cu. ft) (ac-ft) (cfs) (cfs) (sq. ft) 0.00 0 .00 0. 0.000 0.000 0.00 1820. 0.01 0.01 18. 0.000 0.002 0.00 1825. 0.02 0.02 37. 0.001 0.002 o.oo 1830. 0.03 0.03 55. 0.001 0.002 o.oo 1835. • 0.04 0.04 73. 0.002 0.003 0.00 1839. 0.05 0.05 92. 0.002 0.003 0.00 1844. 0.06 0.06 110. 0.003 0.003 0.00 1849. 0.16 0.16 298. 0.007 0.006 0.00 1898. 0.26 0.26 490. 0.011 0.007 0.00 1948. 0.36 0. 36 687. 0.016 0.008 0.00 1998. 0.46 0. 46 889. 0.020 0.009 0.00 2049. 0.56 0.56 1097. 0.025 0.010 0.00 2100. 0.66 0.66 1310. 0.030 0 .011 0. DO . 2152. 0. 76 0. 76 1527. 0.035 0.012 o.oo 2204. 0.86 0.86 1750. 0.040 0.013 o.oo 2256. 0.96 0.96 1979. 0.045 0 .014 o.oo 2310. 1.06 1.06 2212. 0.051 0.014 0.00 2363. 1.16 1.16 2451. 0.056 0.015 0.00 2417. 1.26 1. 26 2696. 0 .062 0.016 o.oo 2472. 1. 36 1. 36 2946. 0.068 0.016 0.00 2527. 1.46 1. 46 3201. 0.073 0.017 0.00 2583. 1.56 1.56 3462. 0.079 0.017 0.00 2639. 1. 66 1. 66 3729. 0.086 0.018 0.00 2696. 1. 76 1. 76 4001. 0.092 0.018 0.00 2753. 1. 86 1. 86 4280. 0.098 0.019 o.oo 2811. 1. 96 1. 96 4564. 0.105 0.019 0.00 2869. 2.00 2.00 4679. 0.107 0.020 0.00 2892. 2.01 2.01 4708. 0.108 0.020 0.00 2898. 2.02 2.02 4737. 0.109 0.021 0.00 2904. 2.03 2.03 4766. 0.109 0.021 0.00 2910. 2.04 2.04 4795. 0.110 0.022 o.oo 2916. 2.05 2.05 4824. 0 .111 0.023 0.00 2921. 2.06 2.06 4853. 0 .111 0.023 0.00 2927. 2.16 2.16 5149. 0 .118 0.025 o.oo 2987. 2 .26 2.26 5451. 0.125 0.027 0.00 3046. 2.36 2.36 5758. 0.132 0.029 0.00 3106. 2.46 2.46 6072. 0.139 0.030 0.00 3167. 2.56 2.56 6392. 0.147 0.032 0.00 3228. • 2. 66 2.66 6718. 0.154 0.033 0.00 3290. 2,76 2. 76 7050. 0.162 0.034 0.00 3352. 2.66 2, 86 7366, 0, 170 0,030 o.oo 305, 2.96 2.96 7733. 0.178 0.036 0.00 3478. • • • 3.00 3.00 7872. 0.181 0.037 0.00 3503. 3.10 3 .10 8226. 0.189 0.346 0.00 3567. 3.20 3.20 8586. 0.197 0.910 0.00 3631. 3.30 3.30 8952. 0.206 1. 640 0.00 3696. 3.40 3.40 9325. 0.214 2.430 0.00 3762. 3.50 3.50 9704. 0.223 2. 720 0.00 3827. 3.60 3.60 10090. 0.232 2.970 0.00 3894. 3.70 3.70 10483. 0.241 3.210 0.00 3961. 3.80 3.80 10883. 0.250 3.430 0.00 4028. 3.90 3.90 11289. 0.259 3.630 0.00 4096. 4.00 4 .00 11702. 0.269 3.830 0.00 4164. 4.10 4.10 12122. 0.278 4.010 0.00 4233. 4.20 4 .20 12548. 0.288 4 .190 0.00 4302. 4.30 4 .30 12982. 0.298 4 .360 0.00 4372. 4 .40 4.40 13423. 0.308 4.520 0.00 4443. 4.50 4.50 13871. 0.318 4. 680 0.00 4513. 4. 60 4.60 14326. 0.329 4.830 0.00 4585. 4.70 4. 70 14788. 0.339 4.980 o.oo 4657. 4.80 4 .80 15257. 0.350 5.130 0.00 4729. 4.90 4.90 15733. 0 .361 5.270 o.oo 4802. 5.00 5 .00 16217. 0. 372 5.400 o.oo 4875. Hyd Inflow Outflow Peak Storage Target Cale stage Elev (Cu-Ft) (Ac-Ft) 1 0.30 ******* 0 .17 3.04 3.04 8022. 0.184 2 0.14 0.05 0.06 3.01 3.01 7896. 0.181 3 0 .16 ******* 0.03 2.54 2.54 6321. 0.145 4 0.15 ******* 0.03 2.31 2.31 5615. 0.129 5 0.18 ******* 0.03 2.42 2. 42 5941. 0.136 6 0.14 ******* 0.02 1. 80 1. 80 4123. 0.095 7 0 .11 ******* 0.02 1.39 1.39 3019. 0.069 8 0 .11 ******* 0 .01 0.94 0. 94 1932. 0.044 Duration Comparison Anaylsis Base File: exist.tsf New File: rdout.tsf Cutoff Units: Discharge in CFS -----Fraction of Time--------------Check of Tolerance------- Cutoff Base New %Change Probability 0.021 0.43E-02 0.43E-02 1.1 I 0.43E-02 0.024 0.32E-02 0.37E-02 17.4 I 0. 32E-02 0 .026 0.24E-02 0.29E-02 18.8 I 0.24E-02 0.029 0.17E-02 0.16E-02 -4.8 I 0.17E-02 0.032 0.13E-02 0.91E-03 -31.7 I 0.13E-02 0.035 O.lOE-02 0.59E-03 -41. 9 I O.lOE-02 0.037 0.82E-03 0.65E-04 -92.0 I 0.82E-03 0.040 0.60E-03 0.49E-04 -91. 9 I 0.60E-03 0.043 0.44E-03 0.49E-04 -88.9 I 0.44E-03 0.045 0.29E-03 0.33E-04 -88.9 I 0.29E-03 0.048 0,16E-03 0.33E-04 -80.0 I 0.16E-03 0.051 0.98E-04 0.33E-04 -66.7 I 0.98E-04 0.054 0.82E-04 0.16E-04 -80.0 I 0.82E-04 Maximum positive excursion= 0.002 cfs ( 7.6%) occurring at 0.023 cfs on the Base Oata:exist.tsf and at 0.025 cfs on the New Data:rdout.tsf Maximum negative excursion a 0.018 cfs (-32.2%) occurring at 0.054 cfs on the Base oata:exist.tsf and at 0.037 cfs on the New Data:rdout.tsf Base New %Change 0.021 0.021 0.2 0.024 0.025 7 .5 0.026 0.028 4 .3 0.029 0.029 -0.4 0.032 0.030 -7.0 0.035 0. 031 -9. 5 0.037 0.033 -12.1 0.040 0.035 -13.8 0.043 0.035 -17.2 0.045 0.036 -21. 3 0.048 0.036 -24. 7 0.051 0.037 -27.7 0.054 0.037 -31.2 (0 • 0 rdout.dur <> \ target.dur • \ \ \ I \ LO \ 0 "" \ 0 "-.._ R ,,"---.._ . ',,,'()_ ,.._ -----------0 \ (/) u.. y , C) \ '-' • Q) M ' e> 0 m .r: u 1/1 5 ~.<< ' ..- \,\ 0 • 10 -4 Probability Exceedence • • • Project: Lund Plat Date: Jailhouse Window Overflow 1/19/2006 By: LT Rectangular, Sharp Crested Weir Q = C (L -0.2H) HA3/2 C = 3.27 + 0.40H/P Q(100) = 0.736cfs H p L 0.17 3.5 2.5 0.25 3.5 2.5 C 3.3 3.3 Q 0.57 Jailhouse Window 1.01 Specify 3' wide window to account for bar area and height > 3" Drainage Cales.xis Sharp Crested .Weir Printed: 1/19/2006 '· • [LlUJ~[Q) [P)[L~[J 1~~lUJ[J[H] [ffi~~~~] • __, -,,,,,.., .... ,..,.. ..... ..,..~ '"' . '·!,'.;.~;';,_-'.;~:.:.-:.·,~ ;)~?. : ,-,.,c,-"'•'·'·""' -! ~ ! . -· l),._b., ·~ ... l -, PROPOSED: SITE SF (AC): STREET SF (AC): FOREST: IMPERVIOUS: 7,049 (0.16) PASTURE: 11,027 (0.25) GRASS: 954 (0.02) W£TLAND: 5,365 (0.12) 104 (0.00) TOTAL: 23,441 (0.54) 1,058 (0.02) •SOME AREAS SHOW "ROUND-OFF" ERROR "',.,"r ~ --· ·11i ;,;,,,-;,',' .-i- :· &5e."' {1,1) ~ '""-'"' n I, :"<i_'2J TOTAL SF (AC): 7,049 (0-16) 11,027 (0.25) 954 (0.02) 5,469 (0.13) 24,499 (0.56) I ....!. ' "(9-._95-~ iit>.RNei-., /t' iii""'"" ! "' ?';~}t~A'.'if"'\;.·:\;":/J. 0 40 I I SCALE: 1" = 80 zE9 80 : fl _ I • "' 10-1 ..-en u.. "' 0 --., Q) • (.) en 0 o exist.pks in Sea-Tac + dev.pks • • () Return Period 2 5 1 5 1 0 • • () • • • () () () 0 <> ~0-3'~-~-~--~-~-~---~-------------- 20 30 40 50 60 70 80 Cumulative Probability 90 95 98 99 1 2 5 10 I I I • • • Flowsum.txt Lund Plat summary of Peak flows Tributary to wetland from site 9/9/05 Flow Frequency Analysis Time Series File:exist.tsf Project Location:sea-Tac ---Annual Flow Rate (CFS) 0.052 0.016 0.050 0.004 0.020 0.031 0.029 0.080 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 2/27/03 7:00 3/24/04 19:00 1/05/05 8: 00 1/18/06 16:00 11/24/06 4:00 1/09/08 9:00 computed Peaks Flow Frequency Analysis Time series File:dev.tsf Project Location:sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.083 3 2/09/01 2 00 0.050 7 1/05/02 16 00 0.096 2 2/27/03 7 00 0.044 8 8/26/04 2 00 0.053 6 10/28/04 16 00 0.069 4 1/18/06 16 00 0.065 5 11/24/06 3 00 0.144 1 1/09/08 6 00 computed Peaks -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 0.080 1 100.00 0.052 2 25.00 0.050 3 10.00 0.031 4 5.00 0.029 5 3.00 0.020 6 2.00 0.016 7 1.30 0.004 8 1.10 0.071 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 0.144 1 100.00 0.990 0.096 2 25.00 0.960 0.083 3 10.00 0.900 0.069 4 5.00 0.800 0.065 5 3.00 0.667 0.053 6 2.00 0.500 0.050 7 1.30 0.231 0.044 8 1.10 0.091 0.128 50.00 0.980 Page 1 • • • volsum.txt Lund Plat summary of Runoff volume Directed to wetland from Site 9/9/05 Discharge volume from Time series exist.tsf between 10/01/00 00:00 and 10/30/00 23:59 2879. cu-Ft or 0.066 Ac-Ft in 30.0 days Discharge volume from Time series dev.tsf between 10/01/00 00:00 and 10/30/00 23:59 5858. cu-Ft or 0.134 Ac-Ft in 30.0 days Page 1 ~-------------------------------------------- • • • Rational Method Project: Date: Lund Plat 1/20/2006 WEST BASIN -25-YR Calculates the peak runoff Q=CIRA 1) Compute Composite Runoff Coefficient Cc: A, A2 A c:o:5 ~· L /.~10GA 100 I So ro7o:r ,:." "" 0:02 k, ~jifti· =~ 2.Q C l:G'.25J h0>'9.I 2) Compute Peak Rainfall Intensity IR: 2a) First, compute Travel Time Tc: T A, 0 0 0.02 20 0.9 T-&f (travel time, min) V 2b) Second, compute unit peak rainfall intensity factor, iR = aR*Tc'-bR: R = 25 (storm return frequency, years) aR = 2.66 (coefficient from Table 3.2.1.B ---pg 3-13) bR = 0.65 (coefficient from Table 3.2.1.B---pg 3-13) iR = ia.til. J 2c) Third, compute IR= PR*iR: PR= 3.4-(t?recipitation, in) IR= -.M;J 3) Compute Peak Runoff Rate, QR= CIRA: QR= ltml]cfs Drainage Cales.xis Rational Method 1/24/2006 • • • Rational Method Project: Date: Lund Plat 1/20/2006 WEST BASIN -100-YR Calculates the peak runoff Q=CIRA 1) Compute Composite Runoff Coefficient Cc: A, A2 A 0.5 0.41 L 100 100 So 0.03 0.02 k, 7 20 C 0.25 0.9 2) Compute Peak Rainfall Intensity IR: 2a) First, compute Travel Time Tc: T A3 0 0 0.02 20 0.9 (travel time, min) 2b) Second, compute unit peak rainfall intensity factor, iR = aa*T c'·ba: R = 100 (storm return frequency, years) a"= 2.61 (coefficient from Table 3.2.1.B---pg 3-13) ba = 0.63 (coefficient from Table 3.2.1.B---pg 3-13) iR= 1111.mm 2c) Third, compute IR = PaiR: PR= 3.9 (precipitation, in) IR= -- Drainage Cales.xis Rational Method 1/24/2006 • • • Rational Method Project: Lund Plat Date: 1/20/2006 EAST BASIN -25-YR Calculates the peak runoff Q=CIRA 1) Compute Composite Runoff Coefficient Cc: A, A2 A 0.3 0.43 L 100 100 So 0.03 0.02 k, 7 20 C 0.25 0.9 2) Compute Peak Rainfall Intensity IR: 2a) First, compute Travel Time Tc: T 1 T2 T a A, 0 0 0.02 20 0.9 At, Cc • 0lv,3P (tributary areas, acres) (length along flowpath, ft) (slope along flowpath, tuft) (from Table 3.2.1.C--pg 3-13) Q!iml3Ji(from Table 3.2.1.A---pg 3-13) (travel time, min) 2b) Second, compute unit peak rainfall intensity factor, iR = aR *T c"-bR: R = 25 (storm return frequency, years) aR = 2.66 (coefficient from Table 3.2.1.8---pg 3-13) bR = 0.65 (coefficient from Table 3.2.1.B ---pg 3-13) iR= 11/iEt!J 2c) Third, compute IR= PR *iR: PR = 3.4 (precipitation, in) IR= -~'&~ 3) Compute Peak Runoff Rate, QR = CIRA: QR= ~@i@fJJcts Drainage Cales.xis Rational Method 1/24/2006 ~----------------- • • • Rational Method Project: Lund Plat Date: 1/20/2006 EAST BASIN -100-YR Ca/cu/ates the peak runoff Q=C/RA 1) Compute Composite Runoff Coefficient Cc: A, A2 A 0.3 0.43 L 100 100 So 0.03 0.02 k, 7 20 C 0.25 0.9 2) Compute Peak Rainfall Intensity /R: 2a) First, compute Travel Time Tc: T, T A3 0 0 0.02 20 0.9 A,, Cc Wt16f&3* (tributary areas, acres) (length along flowpath, fl) (slope along flowpath, ft/ft) (from Table 3.2.1.C-pg 3-13) WM\$W(from Table 3.2.1.A---pg 3-13) (travel time, min) 2b) Second, compute unit peak rainfall intensity factor, iR = aR*Tc'-bR: R = 100 (storm return frequency, years) aR = 2.61 (coefficient from Table 3.2.1.B --pg 3-13) ba = 0.63 (coefficient from Table 3.2.1.B ---pg 3-13) ia= · Wffl~j 2c) Third, compute /R = PR*iR: PR= 3.9 (precipitation, in) ,R= wet,~ 3) Compute Peak Runoff Rate, QR= CIRA: QR= ~cfs Drainage Cales.xis Rational Method 1/24/2006 ~--------------------- • • Rational Method Project: Lund Plat Date: 1/20/2006 UPSTREAM TRIBUTARY AREA -25-YR Calculates the peak runoff Q=CIRA 1) Compute Composite Runoff Coefficient Cc: A, A2 A 1.85 1.85 L 200 535 So 0.02 0.02 k, 7 15 C 0.36 0.36 2) Compute Peak Rainfall Intensity I": 2a) First, compute Travel Time Tc: T A3 0 0 0.02 20 0.9 A.,, Cc • 3*W(tributary areas, acres) (length along flowpath, ft) (slope along flowpath, ft/ft) (from Table 3.2.1.C ---pg 3-13) Ill 0l:$'.6#(from Table 3.2.1.A---pg 3-13) (travel time, min) 2b) Second, compute unit peak rainfall intensity factor, i" = as*T c'-b": R = 25 (storm return frequency, years) a"= 2.66 (coefficient from Table 3.2.1.B ---pg 3-13) bR = 0.65 (coefficient from Table 3.2.1.B ---pg 3-13) iR= ,rntffli 2c) Third, compute IR= Pa*iR: PR = 3.4 (precipitation. in) IR = b£2'1tl 3) Compute Peak Runoff Rate, QR= CIRA: QR= tQQ~ijcfs Drainage Cales.xis Rational Method · 1/24/2006 • • • Rational Method Project: Lund Plat Date: 1/20/2006 UPSTREAM TRIBUTARY AREA-100-YR Calculates the peak runoff Q=CIRA 1) Compute Composite Runoff Coefficient Cc: A, A2 A 1.85 1.85 L 200 535 So 0.02 0.02 k, 7 15 C 0.36 0.36 2) Compute Peak Rainfall Intensity IR: 2a) First, compute Travel Time Tc: T A3 0 0 0.02 20 0.9 f(tributary areas, acres) (length along flowpath, ft) (slope along flowpath, tuft) (from Table 3.2.1.C --pg 3-13) $#$3$8(from Table 3.2.1.A--pg 3-13) (travel time, min) 2b) Second, compute unit peak rainfall intensity factor, iR = aR *T c'-bR: R = 100 (storm return frequency, years) aR= 2.61 (coefficientfromTable3.2.1.B---pg3-13) bR = 0.63 (coefficient from Table 3.2.1.B---pg 3-13) iR= 11Ro)i:~ 2c) Third, compute IR= PR*iR: PR= 3.9 (precipitation, in) IR= .. I?J 3) Compute Peak Runoff Rate, QR = CIRA: QR= -az~Jcfs Drainage Cales.xis Rational Method 1/24/2006 • • • BWPIPE INPUT DATA Project: Lund Plat Date: 2/20/2006 sitepipe. CONVEYANCE PIPING TO POND (West Basin) 1 .4 = 25-yr flow for site 1.6 = 100-yr flow for site 472.29 = tailwater elev. /25-vr WS in oond) CB# L (ft) DIA (in) TYPE OUTLET-IE RIM/0.F. EL. BNDANG STR. DIA /ft) Q-RAT N3-W 21 12 1 468.28 473.28 90 2.5 0 N4-W 115 12 1 169.61 473.28 0 2.5 1 N5-W 123 8 1 470.28 478.33 pondpipe. CONVEYANCE PIPING FROM POND (West Basin) 1 .4 = 25-yr flow for site 1.6 = 100-yr flow for site 469 = Hiqhwater downstream CB# L (ft) DIA (in) TYPE OUTLET-IE RIM/0.F. EL. BNDANG STR. DIA /ft) Q-RAT N1-W 39 12 1 467.34 474.78 roadpipe. CONVEYANCE PIPING TO TANK (East Basin) 1.3 = 25-yr flow for site 1.5 = 100-yr flow for site 471.15 = tailwater elev. (25-vr WS in tank) CB# L (ft) DIA (in) TYPE OUTLET-IE RIM/0.F. EL. BNDANG STR. DIA /ft) Q-RAT N5-E 7 12 1 468.89 473.51 90 2.5 0 N6-E 144 12 1 470.51 474.92 0 2.5 0 N7-E 178 12 1 472.1 478.7 tankpipe. CONVEYANCE PIPING FROM TANK (East Basin) 4.5 = 25-yr flow for site (1.3) + upstream (3.2) 5.3 = 100-yr flow for site (1.5) + upstream (3.8) 470 = Hi~hwater downstream CB# L (ft) RIM/0.F. EL. N1-E N2-E Drainage Cales.xis BWPIPE 2/20/2006 125 471.8 32 473.79 DIA (in) BNDANG 12 45 12 TYPE STR. DIA /ft) 1 2.5 1 OUTLET-IE Q-RAT 466.8 10 467.38 INLET-IE INLET-TYPE 469.51 5 470.18 5 475.33 5 INLET-IE INLET-TYPE 468.28 5 INLET-IE INLET-TYPE 470.41 5 472 5 475.7 5 INLET-IE INLET-TYPE 467.28 5 467.79 5 • • • sitepipe.txt KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h File Opened for Reading:sitepipe.bwp File opened for writing:sitepipe.doc BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:sitepipe.bwp surcharge condition at intermediate junctions Tailwater Elevation:472.29 feet Discharge Range:0.5 to 2. Step of 0.5 [cfs] overflow Elevation:478.33 feet Weir: NONE Upstream velocity:1. feet/sec PIPE NO. 1: 70 LF -12"CP @ 1.76% OUTLET: 468.28 INLET: 469.51 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 473.28 BEND: 90 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0. so 2.81 472.32 * 0.012 0.30 0.22 4.01 4.01 2.80 2.81 0.40 1.00 2.87 472. 38 * 0.012 0.43 0.30 4.01 4.01 2.83 2.87 0. 59 1. so 2.99 472.50 • 0. 012 0.52 0.38 4.01 4.01 2.89 2.99 o. 77 2.00 3.15 472.66 * 0. 012 0.61 0.44 4.01 4.01 2.97 3.15 0.94 PIPE NO. 2: 115 LF -12"CP @ 0. 50% OUTLET: 469.61 INLET: 470.18 INTYP: s JUNC NO. 2: OVERFLOW-EL: 473.28 BEND: 0 DEG DIA/WIDTH: 2.5 Q-RATIO: 1.00 Q(CFS) HW(FT) HW ELEV. ,, N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* o. so 2 .18 472.36 ,, 0.012 0. 30 0.30 2. 71 2. 71 2.17 2 .18 0.40 1.00 2.30 472.48 * 0. 012 0.43 0.42 2. 77 2.77 2.28 2.30 0.58 1. so 2. 55 472.73 * 0. 012 0. 52 0.54 2.89 2 .89 2.49 2. 55 0.73 2.00 2.89 473. 07 * 0. 012 0.61 0.64 3.05 3.05 2.79 2.89 0.86 PIPE NO. 3: 123 LF -B"cp @ 4.11% OUTLET: 470.28 INLET: 475.33 INTYP: 5 Q(CFS) HW(FT) HW ELEV. • N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0. 25 0.29 475.62 • 0.012 0. 24 0.14 2.08 2.08 0. so 0.45 475.78 • 0.012 0.34 0.20 2 .20 2 .20 0.75 0.60 475.93 • 0.012 0.41 0.25 2.45 2 .45 1.00 o. 75 476.08 • 0.012 0.48 0. 29 2.79 2.79 File Opened for writing:sitepipe.bwt save results to HW/TW file:sitepipe.bwt Exit KCBW Program KING COUNTY DEPARTMENT OF NATURAL RESOURCES Water and Land Resources Division BACKWATER ANALYSIS PROGRAM version S.30h Page 1 0.24 ***** 0. 29 0.34 ***** 0.45 0.41 ***** 0.60 0.48 ***** 0.75 • • • roadpi pe. txt KING COUNTY DEPARTMENT OF NATURAL RESOURCES Water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h File opened for Reading:roadpipe.bwp File Opened for writing:roadpipe.doc BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:roadpipe.bwp surcharge condition at intermediate junctions Tailwater Elevation:471.15 feet Discharge Range:0.5 to 2. Step of 0.5 [cfs] Overflow Elevation:478.7 feet Weir :NONE upstream velocity:1. feet/sec PIPE NO. 1: 7 LF -12"CP @ 21. 71% OUTLET: 468.89 INLET: 470.41 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 473.51 BEND: 90 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0. 50 0.30 470.71 * 0.012 0.30 0.12 2.26 2.26 0.30 ***** 0. 30 1.00 0.49 470.90 ,, 0.012 0.43 0.17 2.26 2 .26 0.43 ***** 0.49 1. 50 0.67 471. 08 • 0.012 0. 52 0.20 2.26 2.26 0. 52 ***** 0.67 2.00 0.84 471. 25 • 0.012 0.61 0.23 2.26 2.26 0.61 ,i,;,,i,.,, 0.84 PIPE NO. 2: 144 LF -12"CP @ 1.03% OUTLET: 470. 51 INLET: 472.00 INTYP·: 5 JUNC NO. 2: OVERFLOW-EL: 474.92 BENO: 0 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 HW(FT) HW ELEV. * N-FAC DC ON TW DO DE HWO HWI Q(CFS) ******************************************************************************* 0. 50 0.39 472. 39 • 0.012 0.30 0.25 0.20 0.25 0. 30 ***** 0.39 1.00 0. 57 472.57 • 0.012 0.43 0.35 0.39 o. 39 0.43 ***id, o. 57 1. 50 0.70 472.70 • 0.012 o. 52 0.43 0. 57 0.57 0.52 ***** 0. 70 2.00 0.82 472.82 • 0.012 0.61 0.51 0. 74 0.74 0.61 ***** 0.82 PIPE NO. 3: 178 LF -12"CP @ 2.02% OUTLET: 472 .10 INLET: 475.70 INTYP: 5 HW ELEV. • N-FAC DC ON TW DO DE HWO HWI Q(CFS) HW(FT) ******************************************************************************* 0. 50 0.38 476.08 • 0.012 0.30 0. 21 0. 29 0.29 1.00 0.57 476.27 * 0.012 0.43 0. 29 0.47 0.47 1. 50 0.74 476.44 • 0.012 0.52 0.36 0.60 0.60 2.00 0.89 476.59 • 0.012 0.61 0.42 0.72 0.72 File opened for writing:roadpipe.bwt save results to HW/TW file:roadpipe.bwt Exit KCBW Program KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h Page 1 0. 30 ***** 0. 38 0.43 ***** 0. 57 0.52 ***** 0.74 0.61 **i'** 0.89 • • pondpipe.txt KING COUNTY DEPARTMENT OF NATURAL RESOURCES Water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h File opened for Reading:pondpipe.bwp File Opened for writing:pondpipe.doc BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:pondpipe.bwp surcharge condition at intermediate junctions Tailwater Elevation:469. feet Discharge Range:0.5 to 2. step of 0.5 [cfs] overflow Elevation:474.78 feet Weir :NONE upstream velocity:!. feet/sec PIPE NO. 1: 39 LF -12"CP @ 2.41% OUTLET: 467.34 INLET: 468.28 INTYP: 5 Q(CFS) HW(FT) HW ELEV. * N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0.50 0.73 469.01 * 0.012 0.30 1.00 0. 78 469.06 • 0.012 0.43 ri..50-o.87 469.15 * 0.012 0. 52 ,:__2.00--0. 99 -'. . 469,27 • 0.012 0.61 File Opened for writing:pondpipe.bwt save results to HW/TW file:pondpipe.bwt Exit KCBW Program 0.20 1.66 1.66 0.28 1.66 1.66 0. 35 1.66 1.66 0.40 1.66 1.66 KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h Page 1 0.73 0.73 0. 38 0.74 0.78 o. 57 0.76 0.87 0. 73 0.79 0.99 0.89 • • • roadpi pe. txt KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h File Opened for Reading:roadpipe.bwp File opened for writing:roadpipe.doc BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:roadpipe.bwp Surcharge condition at intermediate junctions Tailwater Elevation:471.15 feet Discharge Range:0.5 to 2. step of 0.5 [cfs] overflow Elevation:478.7 feet Weir: NONE upstream velocity:1. feet/sec PIPE NO. 1: 16 LF -12"CP . @ 8.31% OUTLET: 469.08 INLET: 470.41 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 473.51 BEND: 90 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 Q(CFS) HW(FT) HW ELEV. • N-FAC DC DN TW DO DE HWO HWI ******************************************************************************* 0. 50 0. 76 471.17 • 0.012 0.30 0.15 2.07 2.07 0. 74 0.76 0.36 1.00 0.81 471. 22 • 0.012 0.43 0.21 2.07 2.07 0.74 0.81 0. 56 dio. 0.89 471. 30 • 0.012 0.52 0.25 2.07 2.07 0.74 0.89 0.74 0 1.01 471. 42 • 0.012 0.61 0.29 2.07 2.07 0.74 1.01 0.91 PIPE NO. 2: 58 LF -12"CP @ 2.57% OUTLET: 470.51 INLET: 472.00 INTYP: 5 JUNC NO. 2: OVERFLOW-EL: 474.92 BENO: 0 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.00 HW(FT) HW ELEV. • N-FAC DC DN TW DO DE HWO HWI Q(CFS) ******************************************************************************* 0.50 0. 38 472. 38 • 0.012 0.30 0.20 0.66 0.66 0.30 ***** 0. 38 1.00 0. 56 472.56 • 0.012 0.43 0.28 0.71 0. 71 0.43 ***** 0. 56 ,-1-:-50 0.69 472.69 • 0.012 0. 52 0.34 0. 79 0.79 0. 52 ***** 0.69 ·, .. 2.00 0.81 472.81 • 0.012 0.61 0.40 0.91 0.91 0.61 ***** 0.81 PIPE NO. 3: 178 LF -12"CP @ 2.02% OUTLET: 472.10 INLET: 475.70 INTYP: 5 Q(CFS) HW(FT) HW ELEV. • N-FAC DC ON TW DO OE HWO HWI ******************************************************************************* o. 50 0.38 476.08 • 0 .012 0.30 1.00 0.57 476.27 • 0.012 0.43 1.50--0,74 476.44 • 0.012 0.52 ~2.00 0.89 476.59 • 0.012 0.61 -File opened for writing:roadpipe.bwt save results to HW/TW file:roadpipe.bwt Exit KCBW Program 0.21 0.28 0.28 0.29 0.46 0.46 0. 36 0. 59 0.59 0.42 0.71 0.71 KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h Page 1 0.30 ***** o. 38 0.43 ***** 0.57 0. 52 ***** 0.74 0.61 ***** 0.89 / • e • tankpipe.txt KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h File Opened for Reading:tankpipe.bwp File opened for writing:tankpipe.doc BACKWATER COMPUTER PROGRAM FOR PIPES Pipe data from file:tankpipe.bwp surcharge condition at intermediate junctions Tailwater Elevation:470. feet Discharge Range:0.5 to 5.5 step of 0.5 [cfs] overflow Elevation:473.79 feet weir:NONE Upstream velocity:!. feet/sec PIPE NO. 1: 125 LF -12"CP @ 0.38% OUTLET: 466.80 INLET: 467.28 INTYP: 5 JUNC NO. 1: OVERFLOW-EL: 471.80 BENO: 45 DEG DIA/WIDTH: 2.5 Q-RATIO: 0.40 Q(CFS) HW(FT) HW ELEV. • N-FAC DC ON TW DO DE HWO HWI ******************************************************************************* 0.50 2.76 470.04 • 0.012 0.30 0.32 3.20 3.20 2.75 2.76 0.40 1.00 2.84 470.12 • 0.012 0.43 0.46 3.20 3.20 2.80 2.84 0.59 1.50 2.98 470.26 • 0.012 0.52 0.58 3.20 3.20 2.91 2.98 0.75 2.00 3.19 470.47 • 0.012 0.61 0.70 3.20 3.20 3.06 3.19 0.90 2.50 3.45 470.73 • 0.012 0.68 0.87 3.20 3.20 3.24 3.45 1.05 3.00 3.78 471.06 • 0.012 0.75 1.00 3.20 3.20 3.48 3.78 1.21 3.50 4.16 471.44 * 0.012 0.80tl.OO 3.20 3.20 3.75" 4.16 1.41 **************** OVERFLOW ENCOUNTERED AT , 4 :·oo-cFs-oISCHARGE ****.************* ""******* OVERFLOW CONDITIONS CALCULATED ASSUMING-SURCHARGE-·CONDITIONS ********* 4.00 4.60 471.88 • 0.012 0.85 1.00 3.20 3.20 4.06 4.60 1.63 4.50 5.10 472.38 • 0.012 0.89 1.00 3.20 3.20 4.42 5.10 1.89 5.00 5.66 472.94 • 0.012 0.92 1.00 3.20 3.20 4.82 5.66 2.17 5.50 6.27 473.55 • 0.012 0.94 1.00 3.20 3.20 5.26 6.27 2.49 PIPE NO. 2: 32 LF -12"CP @ 1.28% OUTLET: 467.38 INLET: 467.79 INTYP: 5 HW ELEV. * N-FAC DC ON TW DO DE HWO HWI Q(CFS) HW(FT) ******************************************************************************* 0.36 2.26 470.05 • 0.012 0.25 0. 20 2.66 2.66 2.26 2.25 0.31 o. 71 2.34 470.13 * 0.012 o. 36 0.28 2.74 2.74 2.34 2. 34 0.47 1.07 2.53 470.32 * 0. 012 0.44 0.34 2.88 2.88 2. 50 2.53 0.60 1.43 2. 79 470. 58 • 0. 012 0.51 0.40 3.09 3.09 2.72 2.79 0. 72 1. 79 3.12 470.91 * 0.012 0.57 0.45 3.35 3.35 3.01 3.12 0.83 2.14 3.52 471. 31 • 0.012 0.63 0. 50 3.68 3.68 3.37 3.52 0.94 2.50 4.00 471. 79 • 0.012 0.68 0.55 4.06 4.06 3.78 4.00 1.06 2.86 4.56 472.35 • 0.012 0. 73 0. 59 4.50 4.50 4.26 4. 56 1.17 3.21 5.19 472.98 • 0.012 0.77 0.64 5.00 5.00 4.81 5.19 1. 31 3.57 5.89 473.68 • 0.012 0.81 0.69 5.56 5.56 5.42 5.89 1.47 **************** OVERFLOW ENCOUNTERED AT 3.93 CFS DISCHARGE***************** 3.93 6.66 474.45 * 0.012 0.85 File opened for writing:tankpipe.bwt save results to HW/TW file:tankpipe.bwt Exit KCBW Program 0. 75 6.17 6.17 KING COUNTY DEPARTMENT OF NATURAL RESOURCES water and Land Resources Division BACKWATER ANALYSIS PROGRAM version 5.30h Page 1 6.09 6.66 1.64 /00 'f • • '. ' I ' ' I l ~ ' ' i r ' f • l I ~ u rn -· ---------------------------~ • • APPENDIX E RETENTION/DETENTION FACILITY SUMMARY SHEET & SKETCH ENGINEERING PLAN IN LIEU OF MINOR FLOODPLAIN STUDY • • • • KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL· STORMWATER FACILITY SUMMARY SHEET Development L.11il d Pla.J Date q/1/0 r Location I (al I J 11 t.J th A:w Jf I t2t,Jrru ENGINEER DEVELOPER Name Finn Address Phone Phone Developed Site: Acres 2,0 5 Number oflots '3 -~~-- Number of detention facilities on site: Number of infiltration facilities on site: __ \_ponds ___ ponds vaults vaults _I___ tanks ( "~k-)--of-""'7) tanks Flow control provided in regional facility (give location) __ ~--~-~----~~----- No flow control rnquired . Exemption number I. I Mp flY f. J\-r,,", ·t,11 5 SE, 1,ii, S Downstream Drainage Basms Immediate Basin A "I Basin B ,:;- Basin C .. , Basin D " Number & type of water quality facilities on site: ___ biofiltration swale (regular/wet/ or continuous inflow?) ___ combined detention/WQ pond (WQ portion basic or large?) combined detention/wetvault ___ compost filter ___ filter strip ___ flow dispersion ___ farm management plan ___ landscape management plan Major Basin 'Ri,-,,1, 17., UI .., ., ,, .. ___ sand filter (basic or large?) ___ sand filter, linear (basic or large?) ___ sand filter vault (basic or large?) stormwater wetland ___ wetpond (basic or large?) wetvault ___ oil/water separator (baffie or coalescing plate?) catch basin inserts: Manufacturer ------------------- ___ pre-settling pond ___ pre-settling structure: Manufacturer _________________ _ ___ flow-splitter catchbasin DESIGN lNFORMA TION Water Oualitv design flow Water Quality treated volume or wetpond Yr DESIGN INFORMATION, cont'd 1998 Surface Water Design Manual TOTAL A /N,) l\(lil- \, 1 INDIVlDUAL BASIN Brr;..\ C/W) D/'i 1 ,. .. ' INDIVlDUAL BASIN 9/1/98 KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Drainage basin( s) A (:1\1\ B Ir:;;) CI wl o/Sl Onsite area I} .nc -. Offsite area " ,_ ( - Tvne of Storage Facilitv -.-: .1, D.~,1 Live Storage Volume I I '-l't " L .,"or.l r/2 Predevelooed Runoff Rate 2-vear "'· n'i<q rV s n ri:> rH 10-vear lfl, ,n, 4 (\ r.i:: t 100-vear n. ,Q'3 .. r1,I"' Develooed runoff rate 2-vear i~ •• ~ .. I' 1'2/. 10-vear 11, I<;• ' 1l,1f,'1 100-vear I"\ .?I,,. .. I -, n{'\ Tvne ofrestrictor fl,' '2. .. F\,; J-, Size of orifice/restriction No. 1 (),(cf( • •• fl L,I '·- No.2 l.i~•M lit} I'\..,,, ,,,_, 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) • 09# __ • Plat name or short plat number • Address (nearest) • Date drawn ( or updated) • Thomas Brothers page, grid number 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. • Pipes--indicate: Pipe size Pipe length Flow direction Uses single heavyweight line 4. Tanks--use a double, heavyweight 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. 10. Arrange all the labeling or writing to read from left to right or from bottom to top with reference to a properly oriented heading. l l. Indicate driveways or features that may impact access, maintenance or replacement. 9/1/98 1998 Surface Water Design Manual ?. • l(UJ~[D) ,l~u • [E[M~~[M[E[E~~[Mij [P)lffei[M ~[M l~[E~ (O)[F ~ij[M(O)[R lfl(O)(O)[J)[P)lffei~[M ~'i]'Q)J[O)'tf' I : i '----' I ------I ---'-J .r.,. .. ,......,,,,,.. • .,,c,.,, . 1l 1);~~~~Ftr:::_~---~-~~~~-l:~-~--o---~--~~ ------~--~ ... ~.-.:::::1. ~,···-,,--~-----1 , l ( / >Kl1'J3'~ j (8AS1S -l-•.:~:t.-:/:. -, -m-c ~ :'":-~::~ •.. ( -'~' c ".••>/ 7o_,-:K:(:,. ,-, --.,,,:-=.'~-~ .. ,., .. _\ .,/ ·-_;-,.r l I~ ' a ·, r -..;-~~ --·-,. "' I ,;--,,,,,, -'"'}'" -~\i:·-_ _::-~---'1 ---,,~,----~ .. JI '1 i'n ,:-/ n:LW"'-~,. \; {,;\Qlll ~ I, l //! -.ren f1·~ , 'g ·--.. , II , , ,.::::::~~-, ·1n~ " ~: j' L _::j LllLZ l. ! ~..111 I t l.,i ,.... -, " j' / / .'··-:--.:--.-•·EJ-'-. 1' .~ I 1 • o, I •1; ,,, -, , ·,, !" . . .. ; .,.,., ·•·=... . "cl. . ' .~ · . i . __ I;; e ,J; I.O.L1 , -,,\ LLE1 ..:inc,,,.,,.,,,.,."( :..:.' G""~ ·1 t -:-- I -•; ,. ~q --~~Jr··-·-·-(,. c--, r-c?I ii ~ ·-· "->·•'c; . ,,_c _ _:_:,.,; . / Iv ii I if~ ···,-,--,":'Ji<frr--.···=---·,., ' j ,·--. l r \, L·-<;::,:_---) ~-~-1:1:.,1.QU. :; 11 :1.~~ t.1• ~. , -'~ L .~ d1~-,_;,J, V. l ') -.,,. -,.,·,-·· ~,oa· ,,,,· ~ ' -, ·: t~--.,S..9e• (P) ;r .,. t -'~~y~z~-1 r:~] . ! '"''" l l J' : i I !__ __ _ I I , BASIN OS, Q,F, E;L~V MIN. [l!.,L. F.F. MIN, PROP F.I', (2' ABOVE DJ,) NW <474 476 478 0 I 40 80 ' j w <468 470 472 SCALE: 1" = 80 ft, SW <470* 472 NOTE: THE DOWNSTREAM ELEVATIONS AND AREAS OF IN NUNDA TION SHOWN HERE ARE CONSERVATIVE. THEY REPRESENT A "WORST CASE" SCENARIO. 474 zffi • • APPENDIXD MAINTENANCE REQUIREMENTS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES • • • MAINTENANCE AND OPERATIONS MANUAL FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES ADDRESS: 162171141h Avenue SE Renton, Washington RETENTION/DETENTION FACILITIES The purpose of the detention pond and tank is to reduce the rate of runoff from the developed portions of the property and frontage. Water can flow freely into the pond and tank, but orifices in the outflow risers restrict the outflows. When the inflow exceeds the capacity of the orifices, the excess water is "stored" in the pond or tank, and released slowly after the storm abates. In order to function properly, the facilities must be kept free of accumulated sediment. The outlet pipes also must be kept clean, as even a partial blockage could significantly impact the ability of a facility to store runoff. The facilities 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. CONVEYANCE SYSTEMS Pipes transport runoff from one place to another, in this case from catch basins to the pond or tank, 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 . KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL .• APPENDIX A ~• MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 1 • DETENTION PONDS Maintenance Component General Defect Trash & Debris Poisonous Vegetation Poll1.:1tion Unmowed Grass/ Ground Cover Rodent Holes Insects Tree Growth Side Slopes of Pond Erosion Storage Area Sediment Pond Dikes Settlements Emergency Overflow/Spillway Rock Missing 1998 Surface Water Design Manual Conditions When Maintenance Is Needed Any trash and debris which exceed 1 cubic foot per 1,000 square feel (this is about equal lo the amount of trash it would take to fill up one standard size office garbage can). In general, there should be no visual evidence of dumping. Any poisonous or nuisance vegetation which may constiMe a hazard to County personnel or the public. Oil, gasoline, or other contaminants of one gaUon or more or any amount found that could: 1) cause damage to plant, animal, or marine lite; 2) constitute a fire hazard; or 3) be flushed downstream during rain storms. If facility is located in private residential area, mowing is needed when grass exceeds 18 inches in height. In other areas, the general policy is to make the pond site match adjacent ground cover and terrain as long as there is no interference with the function of the facility. Any evidence of rodent holes if facility is acting as a darn or berm, or any evidence of water piping through dam or benn via rodent holes. When insects such as wasps and hornets interfere with maintenance activities. Tree growth does not allow maintenance access or interferes with maintenance activity (i.e .• slope mowing, silt removal, vactoring, or equipment movements). If trees are not interfering with access, leave trees alone. Eroded damage over 2 inches deep where cause of damage is still present or where there is potential for continued erosion. Accumulated sediment that exceeds 1 0% of the designed pond depth. Any part of dike which has settled 4 inches lower than the design elevation. Only one layer of rock exists above native soil in area five square feet or larger, or any exposure of native soil at the top of out flow path of spillway. Rip-rap on inside slopes need not be replaced. A·l Results Expected When Maintenance Is Performed Trash and debris cleared from site. No danger of poisonous vegetation where County personnel or the public might normally be. (Coordination with Seattle-King County Health Department) No contaminants present other than a surface film. (Coordination with Seattle/King County Health Department) When mowing is needed, grass/ground cover should be mowed to 2 inches in height. Mowing of selected higher use areas rather than the entire slope may be acceptable for some situations. Rodents destroyed and dam or berm repaired. (Coordination with Seattle/King County Health Department) Insects destroyed or removed from site. Trees do not hinder maintenance activities. Selectively cultivate trees such as alders for firewood. Slopes should be stabilized by using appropriate erosion control measure(s); e.g., rock reinforcement, planting of grass, compaction. Sediment cleaned out to designed pond shape and depth; pond reseeded if necessary .to control erosion. Dike should be built back to the design elevation. Replace rocks to design standards. 9/1/98 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILffiES NO. 3-CLOSED DETENTION SYSTEMS (PIPES/TANKS) Maintenance Defect Conditions When Maintenance Is Needed Results Expected When • --::C:co-m-po......,ne,..n_1 ___ .....,=----,...,..,....,..,.----=------:--,,-,,..,,.-----------,....-------M-•_l_n_1e,..n_•_n_c_•_ls_P_e_r1_0_,_m_e_d __ Storage Area Plugged Air Vents One-half of the cross section of a vent is blocked at Vents free of debris and any point with debris and sediment sediment Manhole ..... Catch Basins ~• Debris and Sediment Joints Between Tank/Pipe Section Tank Pipe Bent Out of Shape Accumulated sediment depth exceeds 10% of the diameter of the storage area for ~ length of storage vault or any point depth exceeds 15% of diameter. Example: 72-inch storage tank would require cleaning when sediment reaches depth of 7 inches for more than l2 length of tank. Any crack allowing material to be transported into facility Any part of tank/pipe is bent out of shape more than 10% of it's design shape Cover Not in Place Cover is missing or only partially in place. Any open manhole requires maintenance. Locking Mechanism Not Working Cover Difficult to Remove Ladder Rungs Unsafe Mechanism cannot be opened by one f!18intenance person with proper tools. Bolts into frame have less than Y.! inch of thread (may not apply to self-locking lids.) One maintenance person cannot remove lid after applying 801bs of lift. Intent is to keep cover from sealing off access to maintenance. King County Safety Office and/or maintenance person judges that ladder is unsafe due to missing rungs, misalignment, rust. or cracks. See "Catch Basins" Standards No. 5 1998 Surface Water Design Manual A-3 All sediment and debris removed from storage area. All joint between tank /pipe sections are sealed Tank/ pipe repaired or replaced to design. Manhole is closed. Mechanism opens with proper tools. Cover can be removed and reinstalled by one maintenance person. Ladder meets design standards allows maintenance person safe access. See "Catch Basins· Standards No.5 9/1/98 • APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILffiES NO. 4 -CONTROL STRUCTURE/FLOW RESTRICTOR Maintenance Component General Cleanout Gate Defect Trash and Debris (Includes Sediment) Structural Damage Damaged or Missing Condition When Maintenance is Needed Distance between debris build-up and bottom or orifice plate is less than 1·1/2 feet. Structure is not securely attached to manhole wall and outlet pipe structure should support at least 1,000 lbs of up or down pressure. Structure is not in upright position (allow up to 1 Cl"/, from plumb). Connections to outlet pipe are not watertight and show signs of rust. Any holes-other than designed holes-in the structure. Cleanout gate is not watertight or is missing. Gate cannot be moved up and down by one maintenance person. Chain leading to gate is missing or damaged. Gate is rusted over 50% of its surface area. Results Expected When Maintenance Is Performed All trash and debris removed. Structure securely attached to wall and ouUel pipe. Structure in correct position. Connections to outlet pipe are water tight; structure repaired or replaced and works as designed. Structure has no holes other than designed holes. Gate is watertight and works as designed. Gate moves up and down easily and is watertight. Chain is in place and works as designed. Gate lS repaired or replaced to meet design standards .. • Orifice Plate Damaged or Missing Control device is not working properly due to mjssing, out of place, or bent orifice plate. Plate is in place and works as designed. Obstructions Overflow Pipe Obstructions Manhole Catch Basin • 9/1/98 Any trash, debris, sediment, or vegetation blocking the plate. Any trash or debris blocking (or having the potential of blocking) the overflow pipe. Plate is free of all obstructions and works as designed. Pipe is free of all obstructions and works as designed. See "Closed Detention Systems" Standards No. 3 See "Closed Detention Systems' Standards No. 3 See "Catch Basins" Standards No. 5 See 'Catch Basins" Standards No.5 1998 Surface Water Design Manual A-4 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATE!. Y MAINTAINED DRAINAGE FACILITIES NO. 5 • CATCH BASINS Maintenance Defect Conditions When Maintenance Is Needed Results Expected When .-:,c,-o_m_p_o..,n_e_n_1 ___ _,=-...,..-e-=-,-,------=--,--,...,....,-...,...--.,--,~-,~--~-,-...,..M-•_in~t-e-n_a_nc_•_is~pe_r1_0_rm_•_d __ General Trash & Debris Trash or debris of more than 1/2 cubic foot which is No Trash or debris located (Includes Sediment) located immediately in front of the catch basin immediately in front of catch opening or is blocking capacity of the basin by basin opening. Structure Damage to Frame and/or Top Slab Cracks in Basin Walls/ Bottom Sediment/ Misalignment 1998 Surface Water Design Manual more than 10% Trash or debris (in the basin) that exceeds 1/3 the d8pth from the bottom of basin to invert the lowest pipe into or out of the basin. ' Trash or debris in any inlet or outlet pipe blocking more than 1/3 of its height. Dead animals or vegetation that could generate odors that could cause complaints or dangerous gases (e.g., methane). Deposits of garbage exceeding 1 cubic foot in volume Comer of frame extends more than 3/4 inch past curb face into the street (If applicable). Top slab has holes larger than 2 square inches or cracks \-..iJer than 1/4 inch (intent is to make sure all material is running into basin). Frame not sitting flush on top slab, i.e., separation of more than 3/4 inch of the frame from thEl top slab. Cracks wider than 1/2 inch and longer than 3 feet, any evidence of soil particles entering catch basin through cracks, or maintenance person judges that structure is unsound. Cracks wider than 1 /2 inch and longer than 1 foot at the joint of any inlet/ outlet pipe or any evidence of soil particles entering catch basin through cracks. Basin has settled more than 1 inch or has rotated more than 2 inches out of alignment. A-5 No trash or debris in the catch basin. Inlet and outlet pipes free of trash or debris. No dead anima!s or vegetation present within the catch basin. No condition present which would attract or support the breeding of insects or rodents. Frame is even with curb. Top slab is free of holes and cracks. Frame is sitting flush on top slab. Basin replaced or repaired to design standards. No cracks more than 1/4 inch wide at the joint of inietloutJet pipe. Basin replaced or repaired to design standards. 9/1/98 e • • APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 5-CATCH BASINS (CONTINUEO, Maintenance Defect Conditions When Maintenance is Needed Component Fire Hazard Presence of chemicals such as natural gas, oil and gasoline. Vegetation Vegetation growing across and blocking more than 10% of the basin opening. Vegetation growing in inleVoutlet pipe joints that is more than six inches tall and less than six inches apart. Pollution Nonflammable chemicals of more than 1 /2 cubic foot per three feet of basin length. Catch Basin Cover Cover Not in Place · Cover is missing or only partially in place. Any open catch basin requires maintenance. Locking Mechanism Mechanism cannot be opened by on maintenance Not Working person with proper tools. Bolts into frame have less than 1/2 inch of thread. Cover Difficult to One maintenance person cannot remove lid after Remove applying 80 lbs. of lift: intent is keep cover from sealing off access to maintenance. Ladder Ladder Rungs Ladder is unsafe due to missing rungs, misalignment, Unsafe rust, cracks, or sharp edges. Metal Grates Grate with opening wider than 7/8 inch. {If A~p1icable) Trash and Debris Trash and debris that is blocking more than 20% of grate surface. Damaged or Grate missing or broken member(s) of the grate. Missing. NO. 6 DEBRIS BARRIERS (E.G., TRASH RACKS) Maintenance Components General Metal 9/1/98 Defect Trash and Debris Damaged/ Missing Bars. Condition When Maintenance is Needed Trash or debris that is plugging more than 20% of the openings in the barrier. Bars are bent out of shape more than 3 inches. Bars are missing or entire barrier missing. Bars are loose and rust is causing 50% deterioration to any part of barrier . A-6 Results Expected When Maintenance Is performed No flammable chemicals present. No vegetation blocking opening to basin. No vegetation or root growth present. No pollution present other than surface film. Catch basin cover is closed Mechanism opens with proper tools. Cover can be removed by one maintenance person. Ladder meets design standards and allows maintenance person safe access. Grate opening meets design standards. Grate free of trash and debris. Grate is in place and meets design standards. Results Expected When. Maintenance is Performed. Barrier clear to receive capacity flow. Bars in place with no bends more than 3/4 inch. Bars in place according to design. Repair or replace barrier to design standards. 1998 Surface Water Design Manual __. -• -· APPENDIX A MAINTENANCE STANDARDS FOR PRIVATE!.. Y MAINTAINED DRAINAGE FACILITIES NO. 10 -CONVEYANCE SYSTEMS (PIPES & DITCHES) Maintenance Defect Conditions When Maintenance Is Needed Component Pipes Sediment & Debris Accumulated sediment that exceeds 20% of the diameter of the pipe. Vegetation Vegetation that reduces free movement of water through pipes. Damaged Protective coating is damaged; rust is causing more than 50% deterioration to any part of pipe. Any dent that decreases the cross section area of pipe by more than 20%. Open Ditches Trash & Debris Trash and debris exceeds 1 cubic foot per 1,000 square feet of ditch and slopes. Sediment Accumulated sediment that exceeds 20 % of the design depth. Vegetation Vegetation that reduces free movement of water through ditches. Erosion Damage to See "Ponds" Standard No. 1 Slopes Rock Lining Out of Maintenance person can see native soil beneath Place or Missing {If the rock lining. Applicable). Catch Basins See "Catch Basins: Standard No. 5 Debris Barriers See "Debris Barriers' Standard No.6 (e.g., Trash Rack) NO. 11 -GROUNDS (LANDSCAPING) Maintenance Component General Trees and Shrubs Defect Weeds {Nonpoisonous) Safety Hazard Trash or Litter Damaged 1998 Surface Water Design Manua1 Conditions When Maintenance is Needed Weeds growing in more than 20% of the landscaped area (trees and shrubs only). Any presence of poison ivy or other poisonous vegetation. Paper, cans, bottles, totaling more than 1 cubic foot within a landscaped area (trees and shrubs only) of 1 ,000 square feet. Limbs or parts at trees or shrubs that are split or broken which affect more than 25% of the total foliage of the tree or shrub. Trees or shrubs that have been blown down or knocked over. Trees or shrubs which are not adequately supported or are leaning over, causing exposure of the roots. A-9 Results Expected When Maintenance Is Performed Pipe cleaned of all sediment and debris. All vegetation removed so water flows freely through pipes. Pipe repaired or replaced. Pipe repaired or replaced. Trash and debris cleared from ditches. Ditch cleaned/ flushed of all sediment and debris so that it matches design. Water flows freely through ditches. See "Ponds" Standard No. 1 Replace rocks to design standards. See "Catch Basins" Standard No.5 See "Debris Barriers· Standard No. 6 Results Expected When Maintenance is Performed Weeds present in less than 5% of the landscaped area. No poisonous vegetation present in landscaped area. Area clear of litter. Trees and shrubs with Jess than 5% of total foliage with split or broken limbs. Tree or shrub in place free of injury. Tree or shrub in place and adequately supported; remove any dead or diseased trees. 9/1/98 APPENDIX A MAINTENANCE STANDARDS FOR PRIVATELY MAINTAINED DRAINAGE FACILITIES NO. 12-ACCESS ROADS/ EASEMENTS Maintenance Defect Condition When Maintenance is Needed Results Expected When e Component Maintenance is Performed --· GeneraJ Trash and Debris Trash and debris exceeds 1 cubic foot per 1,000 Roadway free of debris which square feet i.e., trash and debris would fill up could damage tires. one standards size garbage can. Blocked Roadway Debris which could damage vehicle tires (glass Roadway free of debris which or metal). could damage tires. Any obstruction which reduces clearance above Roadway overhead clear to 14 feet road surtace to less than 14 feet high. Any obstruction restricting the access to a 10 to Obstruction removed to allow at 12 foot width for a distance of more than 12 feet least a 12 foot access. or any point restricting access to less than a 10 foot width. Road Surface Se!Uement, Potholes, When any surface defect exceeds 6 inches in Road surface uniformly smooth Mush Spots, Ruts depth and 6 square feet in area. In genera!, any with no evidence of settlement, surface defect which hinders or prevents potholes, mush spots, or ruts. maintenance access. Vegetation in Road Weeds growing in the road surface that are Road surface free of weeds taller Surface more than 6 inches tall and less than 6 inches than 2 inches. tall and less than 6 inches apart within a 400· square foot area. Modular Grid Build·up of sediment mildly contaminated with Removal of sediment and disposal Pavement petroleum hydrocarbons. in keeping with Health Department recommendations for mildly contaminated soils or catch basin sediments. e Shoulders and Erosion Damage Erosion within 1 foot of the roadway more than 8 Shoulder free of erosion and Ditches inches wide and 6 inches deep. matching the surrounding road. Weeds and Brush Weeds and brush exceed 18 inches in height or Weeds and brush cut to 2 inches hinder maintenance access. in height or cleared in such a way as to allow maintenance access . • 9/1/98 1998 Surface Water Design Manual A-10 • • • APPENDIX E RETENTION/DETENTION FACILITY SUMMARY SHEET & SKETCH ENGINEERING PLAN IN LIEU OF MINOR FLOODPLAIN STUDY • • KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL STORMWATER FACILITY SUMMARY SHEET Development i,,JJA d P/aJ Date q/1(0 C Location 1 fol I] 11 t.j /:'b Aw J6 1 r&,Jnxi ENGINEER Name Firm Address Phone Developed Site: Acres Z · D 5 Number of detention facilities on site: __ \_ponds vaults __J__ tanks ( r ,5 k-)·-of· "'"7) Name Finn Address Phone Number of lots ___ 'B~-- Number of infiltration facilities on site: ___ ponds vaults tanks Flow control provided in regional facility (give location), __________________ _ No flow con tro I required Exemption nu 111 ber -'I'-. .sl M"1/J/Jc.vk=fec-c...:.J\-alL.(,.I!_. "f.1>--.:1g...,_5 _,(B,,""',.1 "''""5....__ D D . B · r • ownstream ramae.e asms Immediate Basin A ~, Basin B ,;;.. Basin C .. 1 Basin D <:., Number & type of water quality facilities on site: ___ biofiltration swale (regular/wet/ or continuous inflow?) ___ combined detention/WQ pond (WQ portion basic or large?) combined detention/wetvault ___ compost filter ___ filter strip ___ flow dispersion ___ farm management plan ___ landscape management plan Mai or Basin -;;,,_,,, 0 .,, . .. ., .. ___ sand filter (basic or large?) ___ sand filter, linear (basic or large?) ___ sand filter vault (basic or large?) stonnwater wetland ___ wetpond (basic or 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 Qualitv dcsiQ:n flow Water Quality treated volume or wctoond Yr DESIGN INFORMATION, cont'd 1998 Surface Water Design /'vlanual TOTAL A 7,-.t,) IN'" \, INDIVIDUAL BASIN Bf"'\ C/W) D/'i I ·-., ,. .. . INDIVIDUAL BASIN ----------1 9/1/98 • • KING COUNTY, WASHINGTON, SURFACE WATER DESIGN MANUAL Drainage basin(s) A( ,J,\ B lee) C (w) D/S') Onsite area '2. uc; Offsite area nJ.ct Tvne of Storage Facility •a,>UL ~ Pcmd - Live Storage Volume ..:..:,n r ;;;-"7?.1,")~Q Predevelooed Runoff Rate 2-year n naa r ;... f'RI r I 0-year I) If I, r O.~'i<l( ~ I 00-vear {\ 1' ''.I ~ (), ,10 f Developed runoff rate 2-year fl n 1'.l r, l'l. ,'.le;':: I 0-vear /\ill\! f\ I'-' I I 00-vear fl 1N-I P ~ ,1->117 r c Tvoe ofrestrictor (nr.' C..) ,1 ("' 11, Size of orifice/restriction No. I A 4 n ·· ,., ' ' a ,. No.2 t. ,,1 C1.t1, l {\ "l 'l-( 7.'1' 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 corner). 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 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. Pipes--indicate: Pipe size Pipe length Flow direction Uses single heavyweight line 4. Tanks--use a double, heavyweight 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 -D-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. JO. Arrange all the labeling or writing to read from left to right or from bottom to top with reference to a properly oriented heading. 1 I. Indicate drivev,.rays or features that may impact access, maintenance or replacement. 9/ I /98 1998 Surface Water Design Manunl 7. e __, l [LUJJ~[O) ,t~u - re rM~~rMrErE~~rMlG f?l[Lffei~ ~[M QJ rE~ lOl~ [M1]~fM(O)~ ~llOllOl[O)f?l[Lffei~tM ~ullB[D)W 11411!4J--S.B. 11-""'lli/WL e,ss ~ ""'""; . ,_ ~%.!J'( \ ~· . -·· :. ·"·£' .. l:J· 1)-~~ ---:::Ji~t=irr 1 1· ~ 1ji.f I OU 'L1l1 OU JL~ !2!,2n'{[ 5~t.l)· "'11;1\C- " I 11 ---; ... -~ I . J _J , --_j L _-=-=-=--·-;,~~~~ :~1 . / --· BASIN OS. O.F. ELEV MIN. ALL. F.F. (2' ABOVE O.F.) NW <474 476 w <468 470 SW <470* 472 NOTE: THE DOWNSTREAM ELEVATIONS AND AREAS OF INNUNDATION SHOWN HERE ARE CONSERVATIVE. THEY REPRESENT A "WORST CASE" SCENARIO. MIN. PROP~LF. 478 472 474 . "!:'( .:,;\~\:.:.;.,: .. ;: ''·'" ,,, .. ;I I,,~;· I f., .4 '!. .r, .. ·, o 40 80 I I : SCALE: !" = 80 ft. zffi • • Delineation/ Mitigation/ Restoration I Habitat Creation I Permit Assistance SENSITIVE AREA STUDY FOR Lund 114th A venue King County, WA Wetland Resources, Inc. Project #04153 Prepared By: Wetland Resources, Inc. 9505 19th Ave. SE Suite 106 Everett, WA 98208 (425) 337-3174 For: Guy and Fran Lund 810 4th Street Port Angeles, WA 98362 June 7, 2004 Revision 1: September 27, 2004 9505 19th Avenue S.E. Suite 106 Everett, Washington 98208 (425) 337-3174 Fax (425) 337-3045 • • TABLE OF CONTENTS SITE DESCRIPTION PROJECT DESCRIPTION PROPOSED SENSITIVE AREA IMPACTS AND MITIGATION WETLAND CLASSIFICATION -COWARDIN SYSTEM WETLAND CLASSIFICATION -KING COUNTY ENVIRONMENTALLY SENSITIVE AREAS WETLAND DETERMINATION REPORT BOUNDARY DETERMINATION FINDINGS FUNCTIONS AND VALUES ANALYSIS WILDLIFE USE OF THIS REPORT REFERENCES FIELD DATA SENSITIVE AREA STUDY MAP 1 2 2 3 3 3 4 5 6 7 7 9 10 1 /1 • • • SITE DESCRIPTION Wetland Resources, Inc. conducted a wetland delineation on May 10, 2004 to locate jurisdictional wetlands on the approximate 2 acre site located at 16217 114th Avenue SE in King County, Washington. The site is located as portion of Section 29, Township 23N, Range 5E, W .M. The applicant is proposing a multi-lot residential development for this property. This site is generally flat with a slight depression in the southern portion. One single-family residence and associated infrastructure is located on the northern portion of the site. Surrounding land use is comprised of single-family residences. Access is from the east, via 114th Avenue SE. The northern portion of the site is occupied by maintained lawn associated with the existing single-family residence. The southern part of the site is vacant land, with vegetation represented by sapling black cottonwood, Scotch broom, Himalayan blackberry, and tall fescue. Three wetlands and an intermittent stream are located on the subject site. Wetlands A, B, and C, are emergent wetlands located in the southern portion of the site. Wetland A is a Class 3 wetland. Regulated Class 3 wetlands in King County typically receive 25-foot protective buffers. Wetlands B and C are less than 2,500 square feet in size. Urban Class 3 wetlands less than 2,500 square feet in size in are unclassified in King County. The stream is located in a man-made ditch paralleling the sites' western property boundary and begins approximately 112 feet north of the southwest property corner. This point is the top of the drainage sub-basin with the stream flowing north and roadside ditch flowing north (per Taylor Engineering Consultants drainage analysis). This Class 3 stream is designated a 25-foot protective buffer from its flagged OHWM. PROJECT DESCRIPTION PROPOSED SENSITIVE AREA IMPACTS AND MITIGATION The applicant is proposing a multi lot development on this property. To accommodate portions of Lot 7 and Drainage tract 2, the applicant is proposing to reduce a total of 609 square feet (374 + 235) of the buffer of Wetland A. Mitigation for this buffer reduction is offered through designating a total of 1, 119 square feet (771 + 284 + 64) of area as additional buffer. This represents a slightly better than 2:1 ratio of additional buffer to reduced buffer. The buffer areas proposed to be reduced and the areas proposed to be additional buffer contain similar species and provide equivalent functions and values. The designation of additional area as buffer at a better than 2:1 ratio should maintain or improve functions and values for the site. In addition to buffer averaging, the applicant is proposing to fill the unclassified Wetlands B and C. 2 ----------, •· Impact and Mitigation Table Jmnact Mitiqation Buffer Averaging Reduction Buffer Averaging Addition 1,119 SF 609 SF total Greater than 2:1 ratio WETLAND CLASSIFICATION· COWARDIN SYSTEM According to the Cowardin System, as described in Classification of Wetlands and Deepwater Habitats of the United States, the on-site wetlands are classified as follows: Wetlands A -C: Palustrine, Emergent Wetland, Persistent, Seasonally flooded/ Saturated. Stream: Intermittent, Streambed, Mud WETLAND CLASSIFICATION -KING COUNTY Pursuant to King County Code (KC() section 21A.06.1415, the on-site wetlands are classified as follows: Wetland A Class 3: This wetland is less than one acre in size and has one wetland class. Class 3 Wetlands in King County typically receive 25-foot protective buffers. Wetlands B and C: These wetlands are less than 2,500 square feet in size and have one wetland class. In King County, urban wetlands less than 2,500 square feet in size are not classified. Stream: This stream is intermittent in years of normal rainfall and is not used by salmonids. Class 3 streams are typically designated 25-foot protective buffers from their flagged OHWM. ENVIRONMENTALLY SENSITIVE AREAS The on-site wetland and buffer shall be designated as an Environmentally Sensitive Area (ESA). Environmentally Sensitive Areas are not to be disturbed in compliance with King County's restrictions. Concurrent with future development proposals, Sensitive Area Signs will be required and shall be installed no greater than 150 feet apart with minimum of one per lot. An example of a Sensitive Areas Sign is as follows: 3 e e ENVIRONMENTALLY SENSITIVE AREA THIS WETLAND IS PROTECTED TO PROVIDE WILDLIFE HABITAT AND MAINTAIN WATER QUALITY PLEASE DO NOT DISTURB THIS VALUABLE RESOURCE BUILDING SETBACK --------, Under KCC 21A.24.200 Building Setbacks, unless otherwise provided, buildings and other structures shall be set back a distance of 15 feet from the edges of all sensitive area buffers or from edges of all sensitive areas, if no buffers are required. The following may be allowed in the building setback area: 3) Landscaping; 4) Uncovered Decks; 5) Building overhangs if such overhangs do not extend more than 18 inches into the setback area: 6) Impervious ground surfaces, such as driveways and patios, provided that such improvements may be subject to special drainage provisions specified in administrative rules adopted for the various sensitive areas. WETLAND DETERMINATION REPORT Methodology On site, routine methodology as described in the Washington State Wetlands Identification and Delineation Manual (Washington State Department of Ecology Publication #96-94, March 1997), was used for this determination, as required by King County during the permitting process. Under this method, the process for making a wetland determination is based on three sequential steps: 1) Examination of the site for hydrophytic vegetation (species present and percentage cover). 2) If hydrophytic vegetation is found, then the presence of hydric soils is determined. 3) Determination of the presence of wetland hydrology in the area examined under the first two steps. Vegetation Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydrophytic vegetation as the sum total of macrophytic plant life that occurs in areas where the frequency and duration of inundation or soil saturation 4 • • • --------------- produce permanently or periodically saturated soils of sufficient duration to exert a controlling influence on the plant species present. One of the most common indicators for hydrophytic vegetation is when more than 50 percent of a plant community consists of species rated "Facultative" and wetter on lists of plant species that occur in wetlands. Soil Criteria and Mapped Description The Washington State Wetlands Identification and Delineation Manual, 1997 edition, defines hydric soils as those that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part. Field indicators are used for determining whether a given soil meets the definition and criteria for hydric soils. The soils underlying this site are mapped in the Soil Survey of King County Area Washington, 1973 edition as Alderwood gravelly sandy loam, 6 to 15 percent slopes (Ag(). The AgC soil unit is described as rolling with irregularly shaped areas ranging from 10 to about 600 acres in size. The A horizon ranges from very dark brown to dark brown. The B horizon is dark brown, grayish brown, and dark yellowish brown. Permeability is moderately rapid in the surface layer and subsoil and very slow in the substratum. Available water capacity is described as low. Included within this soil unit are the-poorly drained Norma, Bellingham, Seattle, Tukwila, Shalcar soils, and Alderwood soils that have slopes more gentle or steeper than 6 to 15 percent. Included soil units make up no more than 30 percent of the total acreage. Hydrology Criteria The Washington State Wetlands Identification and Delineation Manual, 1997 edition, states that "areas which are seasonally inundated and/ or saturated to the surface for a consecutive number of days greater than or equal to 12.5% of the growing season are wetlands, provided the soil and vegetation parameters are met. Areas inundated or saturated between 5 and 12.5% of the growing season in most years may or may not be wetlands. Areas saturated to the surface for less than 5% of the growing season are non-wetlands." Field indicators are used for determining whether wetland hydrology parameters are met. BOUNDARY DETERMINATION FINDINGS Wetland A: Wetland A is located in the south central portion of the site. Vegetation in this wetland is represented by soft rush (Juncus effusus, FacW), reed canarygrass (Phalaris arundinacea, FacW), sedge species (Carex spp.), and sparse tall fescue (Festuca arundinacea, Fae-). Several black cottonwood (Populus balsamifera, Fae) are located near the southern edge of this wetland. Typical soils within this wetland have a Munsell color of very dark grayish brown (10 YR 3/2) with redoximorphic features of dark yellowish brown (10 YR 4/4) and a texture of sandy 5 • • Loam from Oto 18 inches below the surface. Soils were moist during our May 2004 site investigation. Wetland B: Wetland B is Located in the southwest part of the property. Vegetation in this wetland is represented by reed canarygrass and creeping buttercup (Ranunculus repens, FacW). Soils have a Munsell color of very dark gray (10 YR 3/1) and a texture of silt Loam from O to 18 inches below the surface. Soils were moist throughout during our May 2004 site visit. Wetland C: This wetland is Located in the eastern central portion of the site, adjacent to 114th Ave SE. Vegetation in Wetland C is represented by overhanging, sapling Bitter cherry (Prunus emarginata, FacU) and willow (Salix Sp., Fae -FacW+), with field horsetail (Equisetum arvense, Fae) rooted in the wetland. Soils in this wetland have a Munsell color of very dark gray (10 YR 3/1) with redoximorphic features of brown (10 YR 4/3) and a texture of silt Loam from O to 18 inches below the surface. Soils were slightly moist during our May 2004 site visit. Non-Wetland: Vegetation in the portions of the site mapped as non-wetland is represented sapling black cottonwood (Populus balsamifera, Fae) and Bitter cherry, with Scotch broom (Cytisus scoparius, nol/Upl), Himalayan blackberry (Rubus discolor, FacU), tall fescue (Festuca arundinacea, Fae-), sweet vernalgrass (Anthoxanthum odoratum, FacU+), common vetch (Vicia sativa, Upl), common dandelion (Taraxacum officinale, FacU), and English plantain (Plantago lanceolata, FacU+ ). Soils in the upland portions of the site are disturbed and appear to be primarily comprised of fill. These soils have Munsell colors ranging from very dark gray (10 YR 3/1) to olive (5 Y 5/3) with textures ranging from silt Loam to sandy Loam. Soils in the upland portions of the property were dry to moist at the time of our May 2004 site investigation. There were no surface indicators of saturation or inundation in the non-wetland areas. It appears that the areas mapped as non-wetland are not saturated for a period greater than 5% of the growing season, and therefore do not meet the wetland hydrology criteria. FUNCTIONS AND VALUES ANALYSIS Methodology The methodology for this functions and values assessment is based on professional opinion developed through past field analyses and interpretation. This assessment pertains specifically to the on-site wetland, but is typical for assessments of similar systems common to western Washington. Functions and Values Components Wetlands in western Washington perform a variety of ecosystem functions. Included among the most important functions provided by wetlands are stormwater 6 • • • storage and flood flow attenuation, water quality improvement, and fish and wildlife habitat. An assessment of these functions for the project site are provided below. Existing Conditions Overall functions and values provided by these wetlands are low. These wetlands make minor contributions to stormwater storage and water quality as a result of their depressional nature, presence of emergent vegetation and location adjacent to a Class 3 stream. Functions for all values provided by these wetlands are limited by their small size, lack or shortage of native and woody vegetation, and proximity to roads and development, as well as the extent of disturbance within these wetlands. Proposed Impacts to Functions and Values The applicant is proposing a multi lot development on this property. To accommodate portions of Lot 7 and Drainage tract 2, the applicant is proposing to reduce a total of 609 square feet (374 + 235) the buffer off of Wetland A. In addition to buffer averaging, the applicant is proposing to fill the unclassified Wetlands B and C. As a result of the current low overall quality of the area, these activities should have minimal impacts to overall functions and values of the site. Post Mitigation Functions and Values Mitigation for this buffer reduction is offered through designating a total of 1,234 square feet of area as additional buffer. This represents a slightly better than 2:1 ratio of buffer averaging addition to buffer averaging reduction. The designation of additional area as buffer at a better than 2: 1 ratio should maintain or improve functions and values for the site, including water quality and wildlife habitat. WILDLIFE At the time of our investigation, fauna typical of western Washington forests at that time of year were heard or observed. Several species of birds were noted including white-crowned sparrow, American robin, dark-eyed junco, and black-capped chickadee. Other resident and migratory species may utilize this site during some portion of their lives. No herpetofauna were noted. USE OF THIS REPORT This Sensitive Area Study and Buffer Averaging Plan is supplied to Guy Lund as a means of describing jurisdictional wetland conditions, as required by King County during the permitting process. This report is based largely on readily observable conditions and to a lesser extent, on readily ascertainable conditions. No attempt has been made to determine hidden or concealed conditions. Reports may be adversely affected due to the physical condition of the site and the difficulty of access which may lead to observation or probing difficulties. 7 • • • The laws applicable to wetlands are subject to varying interpretations and may be changed at any time by the courts or legislative bodies. This report is intended to provide information deemed relevant in the applicant's attempt to comply with the laws now in effect. The work for this report has conformed to the standard of care employed by wetland ecologists. No other representation or warranty is made concerning the work or this report and any implied representation or warranty is disclaimed. Wetland Resources, Inc. ' ~J-~o<--------- Scott Brainard Principal Wetland Ecologist 8 • • • . -· .. ------------, REFERENCES Classification of Wetlands and Deepwater Habitats of the United States. FWS/OBS- 79/31. December 1979. U.S. Department of the Interior, Fish and Wildlife Service. Washington, D.C. Corps of Engineers Wetlands Delineation Manual, 1987. Technical Report Y-87-1. Environmental Laboratory. U.S. Army Engineer Waterway Experiment Station. Vicksburg, MS. King County Zoning Code, Title 21A. King County, WA. February 2000. National List of Plant Species that Occur in Wetlands, Northwest Region. 1996. U.S. Department of the Interior, Fish and Wildlife Service. Washington, D.C. Soil Survey of King County Area Washington. November 1973. U.S. Department of Agriculture, Soil Conservation Service. Washington, D.C. Washington State Wetlands Identification and Delineation Manual. Washington State Department of Ecology. Publication #96-94. March 1997 . 9 Field Data Sheet Lund·114th Ave· WRI# 04153 • Investigation Date: 05/10/04 Pit Depth Texture Color Moisture Species % Status S1 0-18" Sandy Loam 10YR 3/1 sl. moist Festuca arundinacea 90 Fae- Non-Wetland 10YR 4/3 Agrostis tenuis 5 Fae Redox Vicia sativa 5 Nol/Upl Conclusion: Non-Wetland • Parameters for hydrophytie vegetation and wetland hydrology are not met. S2 0-6"' Silt Loam 2.5Y 3/3 moist Anthoxanthum odoratum 50 FacU Non-Wetland 6"-10" Sandy Loam 2.5Y 4/3 moist Festuca arundinacea 20 Fae- 10YR 4/4 redox Agrostis tenuis 10 Fae 10"-18"+ Sand SY 5/3 moist Vicia satlva 10 Nol/Upl 10YR 5/6 redox Plantago lanceolata 5 Fae Juncus patens 5 FaeW Conclusion: Non-Wetland -Parameters for hydrophytic vegetation, hydric soils, and wetland hydrology are not met. • S3 Wetland 0-18" Sandy Loam 10YR 3/2 7.5YR 4/4 redox moist Juncus ef{usus Phalaris arundinacea Carex sp Festuca arundinacea 40 30 20 5 Conclusion: Wetland -Parameters for hydrophytie vegetation, hydrie soils, and wetland hydrology are met. 54 0-18" :;ravelly Sandy Loan 2.SY 4/4 dry Populus balsamifera 10 Non-Wetland Prunus emarginata 5 Cytisus scoparius 10 Rubus discolor 20 Festuca arundinacea 50 Anthoxanthum odoratum 30 Vicia sativa 10 Taraxacum officinale 5 Plantago lanceolata 5 Faew FaeW Fae-Obi Fae- Fae FacU Nol/Upl FaeU Fae- FaeU+ Nol/Upl FaeU FaeU+ Conclusion: Non-Wetland -Parameters for hydrophytie vegetation, hydrie soils, and wetland hydrology are not met . • 10 Strata Herb Herb Herb Herb Herb Herb Herb Herb Herb Herb Herb Herb Herb sapling sapling Shrub Woody Vine Herb Herb Herb Herb Herb e ENVIRONMENTALLY-SITIVE AREA STUDY AND BUFFER AVERAGING MAP LUND 114THAVE e· ····· ........... ~ PORTION OF SECTION 29, TOWNSHIP 23N, RANGE 5E, W.M . Scale 1" = 60' . -. 0 30 60 90 120 S.E. 162ND ST. + o 11 rn JI NTS •TE 11~~1 CLASS 3 STREAM WETLAND B 423 SF UNCLASSIFIED TO BE FILLED BUFFER AVERAGING ADDITION------- 771 SF ow 25' ~ N~ .-0 ~ -I -' EXISTING SINGLE- FAMILY RESIDENCE EXISTING ~~ ,,--:====::::,;==t::::::r--t---GARAGE ~~\\\ ~~ IR! Al-+t -• 1r 11 11 ~ I~ ~I 11 ~ ~ ~ "' . Ir ~ ~ ~ "' I~ 1 '.: rr, V, rr, I WETLAND( -431 SF UNCLASSIFIED TO BE FILLED BUFFER AVERAGING REDUCTION 374 SF lo.:i· BUFFER AVERAGING ~ -±,--6-~ '-*'-~ ........ ...... .,.. ............. ADDITION 64 SF BUFFER AVERAGING ADDITION 399 SF II\ ~/ ~~.... 7 ~ \ BUFFER AVERAGING WETLAND A > ~~ ~ ::':i:tl \ REDUCTION CLASS 3 -----~-235 SF LEGEND ~ WETLAND [Ill] BUFFER AVERAGING ADDITION ~ BUFFER AVERAGING REDUCTION ~ WETLAND FILL ~--DATA SITES • SENSITIVE AREA SIGNS X SENSITIVE AREA FENCING ·• S.E. 164TH ST. .~ ,Wetbitd 'Re$011rces. ll1c. Pdlorntloo f MU1Htioo / Br1tm11Pn I Hnhttnt Ccrntkm I Pccrott A»btun 9505 19th Avenue S.E. Suite 106 Everett,Washlngton 98208 Phone: (425) 337-3174 Fax: (425) 337-3045 Email: mailbox@wetlandresources.com ENVIRONMENTALLY SENSITIVE AREA STUDY AND BUFFER AVERAGING MAP LUND-114TH AVE KING COUNTY Sheet 1 /1 WRI Job# 04153 Drawn by: L. Emenhiser Date: 06/07/2004 Revision 1:09/27/04 Guy and Fran Lund 810 4th Street Port Angeles, WA 98362 • Site Improvement sf d Quantity Worksheet • @ King County Department of Development & Environmental Services 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296-6600 TTY 206-296-7217 Project Name: Lund Plat Location: 16217 114th Avenue SE Clearing greater than or equal to 5,0DO board feet of timber? ~~~~~~yes If yes, Forest Practice Permit Number: (RCW 76.09) Page 1 of 9 x no For alternate formats, call 206-296-6600. Date: 1/10/2005 Project No.: A04PM120 1 L04S0037 Activity No.: Note: All prices include labor, equipment, materials, overhead and profit. Prices are from RS Means data adjusted for the Seattle area or from local sources if not included in the RS Means database. bond quantities.XLS Check out the ODES Web site at www.metrokc.gov/ddes Unit prices updated: 02/12/02 Version: 04/22/02 Report Date: 1/12/2006 • Site Improvement sfd Quantity Worksheet • -~~31r~· .~' :~~,, ' ,, -" ' ' '-, ,, -ER©Sl©N7SEDIMEN'triC0NffiRG>.le!'ilt:~, Backfill & comeaction-embankment ESC-1 $ 5.62 CY Check dams, 4" minus rock ESC-2 SWDM 5.4.6.3 $ 67.51 Each Crushed surfacinJl 1 1 /4" minus ESC-3 WSDOT 9-03.9(32 $ 85.45 CY DitchinJl ESC-4 $ 8.08 CY Excavation-bulk ESC-5 $ 1.50 CY Fence, silt ESC-6 SWDM 5.4.3. 1 $ 1.38 LF 1490 2056 Fence, Temporary (NGPE) ESC-7 $ 1.38 LF 385 531 HydroseedinJl ESC-8 SWDM 5.4.2.4 $ 0.59 SY Jute Mesh ESC-9 SWDM 5 4.2 2 $ 1.45 SY Mulch, by hand, straw, 3" deep ESC-10 SWDM 5.4.2. 1 $ 2.01 SY Mulch, by machine, straw, 2" deep ESC-11 SWDM 5.4.2. 1 $ 0.53 SY Piping, temporary, CPP, 6" ESC-12 $ 10.70 LF Piping, temporary, CPP, 8" ESC-13 $ 16.10 LF Piping, temporary, CPP, 12" ESC-14 $ 20.70 LF Plastic covering, 6mm thick, sandbagged ESC-15 SWDM 5.4.2.3 $ 2.30 SY Rip Rap, machine placed; slopes ESC-16 WSDOT 9-13.1(2) $ 39.08 CY Rock Construction Entrance, 50'x15'x1' ESC-17 SWDM 5.4.4.1 $ 1,464.34 Each Rock Construction Entrance, 100'x15'x1' ESC-18 SWDM 5.4.4.1 $ 2,928.68 Each 2929 Sediment pond riser assembly ESC-19 SWDM 5.4.5.2 $ 1,949.38 Each Sediment trap, 5' high berm ESC-20 SWDM 5.4.5. 1 $ 17.91 LF Sed. trap, 5' high, rip rapped_ spillway benn section ESC-21 SWDM 5.4.5. 1 $ 68.54 LF Seeding, by hand ESC-22 SWDM 5.4.2.4 $ 0.51 SY Sodding, 1" deep, level ground ESC-23 SWDM 5.4.2.5 $ 6.03 SY Sodding, 1" deep, sloped ground ESC-24 SWDM 5.4.2.5 $ 7.45 SY TESC Sueeivisor ESC-25 $ 74.75 HR 201 11 1495 Water truck, dust control I ESC-26 WRlffiE:!lf.1¥1:EEMS;,-;~·,see~pagei9f,;-::;f;f;~i/7;'f7,, Page 2 of 9 $ 97.75 HR .;~~!· Each ESC SUBTOTAL: 30% CONTINGENCY & MOBILIZATION: ESCTOTAL: COLUMN: bond quantities.XLS Check out the DOES Web site at www.metrokc.gov/ddes $ 8,966.18 $ 2,689.85 $ 11,656.03 A Unit prices updated: 02/12/02 Version: 04/22/02 Report Date: 1/12/2006 • Site Improvement 8-Quantity Worksheet Backfill & Compaction-embankment GI -1 $ 5.62 CY Backfill & Compaction-trench GI -2 $ 8.53 CY I 1851 1,578.051 nl 656.81 I 361 Clear/Remove Brush, bv hand GI -3 $ 0.36 SY Clearing/Grubbing/Tree Removal GI -4 $ 8,876.16 Acre Excavation -bulk GI -5 $ 1.50 CY 1 1 l 4101 615.ool Excavation -Trench GI -6 $ 4.06 CY l 1851 751.101 771 312.621 361 Fencing, cedar, 6' high GI -7 $ 18.55 LF Fencing, chain link, vinyl coated, 6' high GI -8 $ 13.44 LF 284 3,816.96 Fencino, chain link, gate, Vinyl coated, 2 GI -9 $ 1,271.81 Each 1 1,271.81 Fencing, split rail, 3' high GI -10 $ 12.12 LF I 3851 Fill & compact -common barrow GI -11 $ 22.57 CY 100 2,257.00 Fill & compact -gravel base GI -12 $ 25.48 CY 84 2.140.32 Fill & compact -screened topsoil GI -13 $ 37.85 CY Gabion, 12" deep, stone filled mesh GI -14 $ 54.31 SY Gabion, 18" deep, stone filled mesh GI -15 $ 74.85 SY I I I 471 3,517.95 Gabion, 36" deep, stone filled mesh GI -16 $ 132.48 SY Grading, fine, by hand GI -17 $ 2.02 SY Grading, fine, with grader GI -18 $ 0.95 SY Monuments, 3' long GI -19 $ 135.13 Each Sensitive Areas Sign GI -20 $ 2.88 Each I I I I I 71 Sodding, 1" deep, sloped ground GI -21 $ 7.46 SY Surveying, line & grade GI -22 $ 788.26 Day 5 3,941.30 l l zl Survevinq, lot location/lines GI -23 $ 1,556.64 Acre J J 3-l Traffic control crew ( 2 flaggers ) GI -24 $ 85.18 HR 80 6,814.40 Trail, 4" chipped wood GI -25 $ 7.59 SY Trail, 4" crushed cinder GI -26 $ 8.33 SY Trail, 4" top course GI -27 $ 8.19 SY Wall, retaining, concrete GI -28 $ 44.16 SF Wall, rockery GI -29 $ 9.49 SF Page 3 of 9 SUBTOTAL 17,482.17 10,191,1_5 *KCC 27A authorizes only one bond reduction. bond quantities.XLS Check out the DDES Web site at www.metrokc.gov/ddes • 307.08 146.16 4.666.20 20.16 1,576.52 __ 4,669.92 11,386.04 Unit prices updated: 02112/02 Version: 4122/02 Report Date: 111012006 • • Site Improvement B-Quantity Worksheet R<!l;t1;Dl1MRR0VEMENiii iiilliiililli!!i- AC Grinding, 4' wide machine < 1 OOOsy I RI -1 I $ 23.00 I SY AC Grinding.!. 4' wide machine 1000-200Q RI -21 $ 5.75 I SY AC Grinding, 4' wide machine > 2000sy I RI -3 I $ 1.38 I SY AC Removal/OisposaURepair Rl-41 $ 41.14 I SY 200 8,228.00 Barricade, ty_e_e I RI -5 I $ 30.03 I LF Barricade_, __ tye_e Ill (Permanent) RI -6 I $ 45.05 I LF Curb & Gutter.!. rolled RI -7 I $ 13.27 I LF 90 1,194.30 Curb & Gutter. vertical I RI -8 l S 9.69 I LF 900 8,721.00 Curb and Gutter, demolllion and disposal RI -9 I S 13.58 I LF Curb, extruded as.e_halt IRI -101 S 2.44 I LF Curb, extruded concrete RI -11 I S 2.56 I LF Sawcut, asphalt, 3" depth RI -121 $ 1.85 I LF 900 1,665.00 Sawcut. concrete, per 1" depth RI -131 $ 1.69 I LF Sealant, as_e_halt I RI -141 $ 0.99 I LF Shoulder, AC, ( see AC road unit price) IRI -151 S SY Shoulder, gravel, 4" thick IRI -161 $ 7.53 I SY Sidewalk, 4" thick IRI -171 $ 30.52 I SY 500 15,260.00 Sidewalk, 4" thick,_d~molition and disposlRl-181 $ 27.73 I SY Sidewalk, 5" thick I RI -191 $ 34.94 I SY Sidewalk, 5" thick, demolition and disposl RI -201 $ 34.65 I SY Sign, handicap I RI -21 I $ 85.28 I Each Striping, per stall IRI -221 $ 5.82 I Each Striping, thermoplastic, ( for crosswalk) !RI -231 $ 2.38 I SF Striping, 4" reflectorized line RI -241 $ 0.25 I LF Page 4 of 9 SUBTOTAL 33,874.00 1,194.30 ·KCC 27 A authorizes only one bond reduction. bond quantities.XLS Check out the DOES Web site at www.metrokc.gov/ddes 98 • li&EEL iillli!!NEliliilll 1,300.46 1,300.46 Unit prices updated: 02/12/02 Version: 4/22/02 Report Date: 1/10/2006 , • Site Improvement eed Quantity Worksheet • If0'A01sl1JRi=AefNG~14~Ii;Ji%'~~&f1!s,IJ2p!,:9.~lJ~%:i5ib'.!ir~l~opl1c9ur~~, For KCRS '93, (additional 2S base) add RS-1 $ 3.60 SY AC Overlay, 1.5" AC RS-2 $ 7.39 SY AC Overlay, 2" AC RS-3 $ 8.75 SY AC Road, 2", 4" rock, First 2500 SY RS-4 $ 17.24 SY I 3001 5, 112.ool 1501 2.586.ool AC Road, 2", 4" rock, Qtv. over 2500SY RS-5 $ 13.36 SY AC Road, 3", 4" rock, First 2500 SY RS-6 $ 19.69 SY AC Road, 3", 4" rock, Qty. over 2500 SY RS-7 $ 15.81 SY AC Road, 5", First 2500 SY RS-8 $ 14.57 SY I 3001 4,371.001 1501 2,185.501 AC Road, 5", Qtv. Over 2500 SY RS-9 $ 13.94 SY AC Road, 6", First 2500 SY RS-1C $ 16.76 SY AC Road, 6", Qty. Over 2500 SY RS-1 $ 16.12 SY Asphalt Treated Base, 4" thick RS -1 $ 9.21 SY Gravel Road, 4" rock, First 2500 SY as -1 $ 11.41 SY I I I 1101 1,939.70 $ 7.53 SY PCC Road, 5", no base, over 2500 SY RS-1 $ 21.51 SY PCC Road, 6", no base, over 2500 SY RS-1( $ 21.87 SY Thickened Edge RS-1 $ 6.89 LF Page 5 of9 SUBTOTAL 9,543.00 _6,711.20 *KCC 27A authorizes only one bond reduction. bond quantities.XLS Check out the DDES Web site at www.metrokc.gov/ddes 165L __ _b844.6o 1651 ·--.. _2,404.05 .. 5,248.65 Unit prices updated: 02/12/02 Version: 4/22/02 Report Date: 1/10/2006 • • Site Improvement .d Quantity Worksheet • • illiffi'1Wll:sErl:tll~~t1~T~, Access Road, RID 0 -1 $ 16.74 SY Bollards -fixed 0-2 $ 240.74 Each Bollards -removable 0-3 $ 452.34 Each * (CBs include frame and lid) CB Type I 0-4 $ 1,257.64 Each I al !,545.841 31 3,772.921 1 I 1,257.64 CB Type IL 0-5 $ 1,433.59 Each 1CB Type II, 48" diameter 0-6 $ 2,033.57 Each for additional depth over 4' 0-7 $ 436.52 FT CB Type II, 54" diameter 0-8 $ 2,192.54 Each I 1 I 2,192.541 1 [ _____ 2_, 192.54 for additional depth over 4' 0-9 $ 486.53 FT CB Tvpe II, 60" diameter 0 -10 $ 2,351.52 Each for additional depth over 4' 0 -11 $ 536.54 FT CB Tvpe II, 72" diameter 0 -12 $ 3,212.64 Each for additional depth over 4' 0 -13 $ 692.21 FT Through-curb Inlet Framework (Add) 0-14 $ 366.09 Each Cleanout, PVC, 4" 0-15 $ 130.55 Each Cleanout, PVC, 6" 0-16 $ 174.90 Each Cleanout, PVC, 8" 0-17 $ 224.19 Each Culvert, PVC, 4" 0-18 $ 8.64 LF Culvert, PVC, 6" 0 -19 $ 12.60 LF Culvert, PVC, 8" D-20 $ 13.33 LF Culvert, PVC, 12" 0-21 $ 21.77 LF Culvert, CMP, 8" 0 -22 $ 17.25 LF Culvert, CMP, 12" 0-23 $ 26.45 LF Culvert, CMP, 15" 0-24 $ .32.73 LF Culvert, CMP, 18" 0 -25 $ 37.74 LF Culvert, CMP, 24" 0 -26 $ 53.33 LF Culvert, CMP, 30" 0 -27 $ 71.45 LF Culvert, CMP, 36" 0 -28 $ 112.11 LF Culvert, CMP, 48" 0 -29 $ 140.83 LF·f--981 13,801.34 Culvert, CMP, 60" 0 -30 $ 235.45 LF Culvert, CMP, 72" 0 -31 $ 302.58 LF Page 6 of9 SUBTOTAL 23,539.72 5,965.46 1,257.64 Unit prices updated: 02/12/02 *KCC 27 A authorizes only one bond reduction. Version: 4/22/02 bond quantities.XLS Check out the DDES Web site at www.metrokc.g_ovlddes Report Date: 1/10/2006 • Site Improvement eed Quantity Worksheet ,unitRnee'Diluo;@!t,au~i\D.1'! Culvert, Concrete, a~ D -32 Culvert, Concrete, 12" D -33 Culvert, Concrete. 15" D -34 Culvert, Concrete, 18" D -35 Culvert, Concrete, 24~ D -36 Culvert, Concrete, 30" D -37 Culvert, Concrete, 36" D -38 Culvert, Concrete, 42" D -39 Culvert, Concrete, 48" D -40 Culvert. CPP, 6" D -41 Culvert. CPP. 8" D • 42 Culvert, CPP, 12" D -43 Culvert. CPP, 15" D -44 Culvert, CPP, 18" D -45 Culvert, CPP, 24" D -46 Culvert, CPP, 30" D -47 Culvert, CPP, 36" D -48 Ditchinq D -49 Flow Dispersal Trench (1,436 base+) D -50 French Drain (3' depth) D -51 Geotextile, laid in trench, polypropylene D -52 Infiltration pond testing D -53 Mid-tank Access Riser, 48" dia, 6' deep D • 54 Pond Overflow Spillwav D -55 Restrictor/Oil Separator, 12" D -56 Restrictor/Oil Separator, 15" D -57 Restrictor/Oil Separator, 18" D -58 Riorap, placed D -59 Tank End Reducer (36" diameter} D -60 Trash Rack, 12" D -61 Trash Rack, 15" D -62 1Trash Rack, 18" D -63 ITrash Rack, 21" D -64 Page 7 of9 '"KCC 27A authorizes only one bond reduction. bond quantities.XLS $ 21.02 s 30.05 $ 37.34 $ 44.51 $ 61.07 $ 104.18 $ 137.63 s 158.42 $ 175.94 $ 10.70 $ 16.10 $ 20.70 $ 23.00 s 27.60 $ 36.80 $ 48.30 $ 55.20 $ 8.08 $ 25.99 $ 22.60 $ 2.40 $ 74.75 $ 1,605.40 $ 14.01 $ 1,045.19 $ 1,095.56 $ 1,146.16 $ 39.08 $ 1,000.50 $ 211.97 $ 237.27 $ 268.89 $ 306.84 SUBTOTAL LF LF LF LF LF LF LF LF LF LF LF LF I 6221 12875.41 2591 5361.31 1231 LF LF LF LF LF CY LF I l --I I I sol LF SY HR Each SY 1 1 1 11 14.01 Eachj 1J 1045.19j 1 I 1045.19 Each Each CY Each T 1T 1000.51 Each I I I 1 I 211.97 Each Each Each 14921.09 6632.47 Check out the DDES Web site at www.metrokc.gov/ddes • 2546.1 2735.5 5281.6 Unit prices updated: 02/12/02 Version: 4/22/02 Report Date: 1/10/2006 • • ';?" • Site Improvement B-Quantity Worksheet BP<RKING,l!Om!'S1llRE1'C1Ni. 2· AC, 2" to.e_ course rock & 4" borrow $ 15.84 I SY 2" AC._ 1.5" top course & 2.5" base cou $ 17.24 I SY 4n select borrow $ 4.55 I SY 1.5~ top course rock & 2S base course $ 11.41 I SY 1wairnE!fN"fl[EMS1111Ji~ (Such as detention/water quality vaults.) I No. WI -1 Each Wl-2 SY Wl-3 CY Wl-4 LF Wl-5 FT Wl-6 Wl-7 Wl-8 WI· 9 WI -10 SUBTOTAL SUBTOTAL (SUM ALL PAGES): 99,359.98 30,694.58 30% CONTINGENCY & MOBILIZATION: 29,807.99 9,208.37 GRANDTOTAL: 129,167.97 39,902.95 COLUMN: B C Page 8 of 9 ·KCC 27A authorizes only one bond reduction. bond quantities.XLS Check out the DOES Web site at www.metrokc.gov/ddes • 24,474.39 7,342.32 31,816.71 D E Unit prices updated: 02/12/02 Version: 4/22/02 Report Date: 1/10/2006 • • r -e Site Improvement sfnd Quantity Worksheet • Original bond computations prepared by: Name: Lund Plat Date: 1/10/2006 PE Registration Number: 29351 Tel.#: 425-391-1415 Firm Name: TEC, Inc. Address: 205 Front Street South/PO Box 1787, lssa.9.u_a_h, WA 98075 Project No: A04PM120, L04S0037 ROAD IMPROVEMENTS & DRAINAGE FACILITIES FINANCIAL GUARANTEE REQUIREMENTS PERFORMANCE BOND· PUBLIC ROAD & DRAINAGE AMOUNT BOND' AMOUNT MAINTENANCE/DEFECT BOND• REQUIRED AT RECORDING OR Stabilization/Erosion Sediment Control (ESC) Existing Right-of-Way Improvements Future Public Road Improvements & Drainage Facilities Private Improvements Calculated Quantity Completed Total Right-of Way and/or Site Restoration Bond'/*' (First $7,500 of bond* shalt be cash.) Performance Bond• Amount (A+B+C+D) = TOTAL Reduced Performance Bond• Total ... Maintenance/Defect Bond• Total · NAME OF PERSON PREPARING BOND' REDUCTION: (A) $ 11,656.0 (B) $ 129,168.0 (C) $ 39,903.0 (D) $ 31,816.7 (A+B) $ 140,824.0 (T) $ 212,543.7 Minimum bond* amount is $1000. TEMPORARY OCCUPANCY ... I (E) $ Tx0.30 $ 63,763.1 (T-E) $ 212,543.7 Use larger of Tx30% or (T-E) * NOTE: The word "bond" as used in this document means any financial guarantee acceptable to King County. ** NOTE: KCC 27A authorizes right of way and site restoration bonds to be combined when both are required. OR (B+C) x 0.25 = $ 42,267.7 Date: The restoration requirement shall include the total cost for all TESC as a minimum, not a maximum. In addition, corrective work, both on-and off-site needs to be included. Quantities shall reflect worse case scenarios not just mir:iimum requirements. For example, if a salmon id stream may be damaged, some estimated costs for restoration needs to be reflected in this amount. The 30% contingency and mobilization costs are computed in this quantity. "** NOTE: Per_KCC 27 A. total bond amounts remaining after reduction shall not be less than 30% of the original amount (T) or as revised by major design changes. SURETY BOND RIDER NOTE: If a bond rider is used, minimum additional performance bond shall be i $ 71,719.7 i(C+D)-E REQUIRED BOND' AMOUNTS ARE SUBJECT TO REVIEW AND MODIFICATION BY DOES Page 9 of 9 Check out the ODES Web site at www.metrokc,govlddes bond quantities.XLS Unit prices updated: 02/12/02 Version:· 4/22/02 Report Date: 1/10/2006 ~ • I ~