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Home My WebLink AboutLUA-08-097_REPORT 01King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Ave SW Remon. WA 98055-1219 Notice Board & Posting Procedures Instruction Package Notice of Application February 27, 2006 L06POOOI In accordance with King County Code Section 20.20.060, enclosed you will find instructions, specifications, and materials in order to meet the notice of application posting requirements of the County. Please read these instructions carefully and take action quickly to order your notice board sign. Your notice board sign can be ordered through a sign painter, using the information supplied on page 2 of the enclosed "Notice Board Requirements." The cost of the sign is the responsibility of the applicant. Further processing of your application is dependent upon fulfilling the notice of application posting requirement. When your sign is in place, attach the colored laminated notice of application along with the plastic envelope (containing extra copies of the notice of application) to the notice board as depicted on page 1 of the instructions. Maintain a supply of notices within the plastic envelope throughout the comment period. The posting sign/notice board must remain in place throughout the duration of your application. Immediately upon completion of the above instructions, complete the enclosed affidavit of posting and return to the Department of Development and Environmental Services, Land Use Division, Current Planning Section, at the address shown above (envelope enclosed). Failure to comply with posting requirements may be cause for a delay in the processing of your application. If you have any questions, please call the Land Use Services Division at (206) 296-6600. Enclosures: Notice Board Requirements-Application Laminated Notice of Application Waterproof Vinyl Envelope containing copies of the Notice of Application Affidavit of Notice of Application Posting formJLUSD return envelope MAIN FILE COpy Notice Board & Posting Procedures Instruction Pkg.-NOA 8/810\ King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Ave SW Remon, WA 98055-1219 L06POOOI -Cavalla Subdivision DDES Project Number AFFIDAVIT OF POSTING 1, ____ --:--:-_----: ______ " hereby affirm that I have posted the following: (print name) X Notice of Permit Application o Oilier ____________ ___ on the day of , 2006, in accordance with the Department of Development and Environmental Services' requirements. I furilier affirm that the notice will remain in place and visible during the full required notice period. Notice was provided at the following location(s): 1) 2) ______________________________________________ _ 3) I hereby affirm that the above is a true and correct statement. Signature This affidavit must be completed and returned to the Land Use Services Division within 7 days of posting. Improper posting or failure to return the affidavit within 7 days shall be cause for the final decision regarding your permit to be postponed. CPSFORMSIAFFIDAVIT OF POSTING. DOC 7127199 ® NOTICE BOARD REQUIREMENTS· NOTICE OF APPLICATION King County Dept. of Development and Environmental Services Land Use Sen'ices Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1212 Per King County Code Section 20.20.060, a notice board must be prepared and posted for your land use application. Please prepare and post in the following manner: Notice Board Size and Text Specifications The notice board shall be constructed to the specifications described below. The notice board shall display the information shown in the figure. Board Construction: The notice board shall be constructed with 4' x 4' plywood. Professionally prepared plastic notice board overlays, permanently affixed to the board are permissible. Notice boards may be reused but they must be clean and show no evidence of former wording. 1. Lettering style: Helvetica or similar standard typeface 2. Lettering size: Title should be 3" capital letters (NOTICE OF PROPOSED LAND USE ACTION). Other letters should be 2" letters except on the 8'12' x 14" laminated paper providing the details of the proposal. See illustration below for use of capital and lower case letters, and placement of laminated paper and vinyl jacket. 3. Lettering: Black (permanent ink or silk-screen) 4. Background Color: White 5. Logo: King County emblem, in black 6. Laminated Notice of Application on a legal size sheet which provides information regarding the proposed land use application. TO BE SUPPLIED BY Land Use Services Division (LUSD) (see enclosed). 7. Legal size waterproof vinyl jackets with a fold flap, and wrap string. TO BE SUPPLIED BY LUSD (see enclosed). The applicant must make copies of the Notice, place them in the vinyl jacket, and maintain a supply of copies throughout the posting period. NOTICE OF PROPOSED LAND USE ACTION King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Call (206) 296·6600 Type of Action: 4 FT Proposal: File No.: Notice Board Requirements-NOA 8/8/01 NOTICE OF APPLICATION 8.5" X 14" LAMINATED 4 FT EXAMPLE COPIES OF NOTICE OF APPLICATION IN VINYL JACKET Pg 1 Standards for LocatingandlhstaJling.Notice Board The notice board shall be located and installed to the specifications described below. Number of Notice Boards required for this application: ONE ( 1 ) Special Instructions: ________________________ _ Notice board shall be located: • Midpoint on the site street frontage or as otherwise directed by LUSD staff to maximize visibility. • At a location 5 feet inside from the street property line; a notice board structurally attached to an existing building shall be exempt from the setback provisions, provided that no notice board is located not more than 5 feet from the property line without approval from LUSD staff. • So that the top of the notice board is between 7 to 9 feet above grade. · So that it is easily accessible and totally visible to pedestrians. The applicant shall erect the notice board by solidly setting the post 12 to 18 inches into the ground; or structurally attached it to an existing building. Two 4" x 4" 8-foot-long (minimum) posts and four washers, bolts and nuts (3/8-inch diameter and bolts are 5-inches long) shall be used to install the notice board. Installation Certification The notice board(s) must be installed within 14 days after Land Use Services Division has determined that the application is complete. The enclosed "Affidavit of Posting" must be signed, and returned to the Land Use Services Division within 7 days following the date of posting. Maintenance and Removal of the Notice Board The applicant shall maintain the notice board in good condition throughout the application review period, which shall extend through the time of the final county decision on the proposal and the expiration of any applicable appeal periods. If the notice board is removed, LUSD review of the land use application may be discontinued until the notice board is replaced and has remained in place for the required period of time. TO BE FILLED OUT BY LUSD STAFF ============================================================================ NOTICE BOARD TEXT INFORMATION (To Be Given to the Sign Painter) Type of Action: Formal Subdivision Proposal: Subdivide 9.23 acres into 34 single family residential lots in the R-4 zone File No.: L06P0001 Cavalla Subdivision NOTE: If you require this material in braille, audio cassette, or large print, please call 206-296-6600 (voice) or for hearing impaired 206-296-7217. Notice Board Requirements-NOA 8/8/01 Pg 2 King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A vc SW Renton, WA 98055-1219 L06POOOl -Cavalla Subdivision DDES Project Number AFFIDAVIT OF POSTING K~> D.D.E.S. I,._D=a-=l.o:e---"S'-"t"'a"'n,,=f"'o'-'ro.Od"---______ , hereby affirm that I have posted the following: (print name) X Notice of Permit Application o Other -------------- on the 10th day of March ,2006, in accordance with the Department of Development and Environmental Services' requirements. I further affirm that the notice will remain in place and visible during the full required notice period. Notice was provided at the following location(s): I) 13804 162nd Avenue SE, Renton 2) ____________________________________________ _ 3) I hereby affirm that the above is' tru and correct statement. ,~ {J Signature This affidavit must be completed and returned to the Land Use Services Division within 7 days of posting. Improper posting or failure to return the affidavit within 7 days shall be cause for the final decision regarding your permit to be postponed. MAIN FILE COP'· CPSFORMS/AFFIDAVIT OF POSTING.DOC 7/27/99 STANFORD SIGNS, L.L.C. 6855171'rstil !JJJ03. NE NO 245 REDMDN", 'WA 98052·5243 iI", , ;,~_); 1[, ,~, 1,-1::,1,-,,-: ':'~-d, ",,,,,,)J J., -~J"1)l "\"'.~~", ® King County <" >. ,e, \, >,:- ,-";" ~. ", -. ~.,. Department of '\ ~'~' "'. , , " ,-(> -'! .. -''-'' .... Development & Environmental Services 900 OAKESDALE AVE SW RENTON WA 98055-1219 ~~., c::> ..... ..:.' en ::;:; r :-;c ~-c 0-< ~~l ;:z: • 3:0 rn ,.., W ~CJ -: __ r~ -u , ::J: ,~ . '" U1 , = '32;;:;;::':='::+ i:::~ i:2 /I, /, ,/" /, 1/, ,,,j, /" I, i"" /1,,), i,,, II. ,/,I/i, "/I,, ,/",1/ <. rn 0 • m~,e Seattle (!['tn~~s ~ REPRESENTI NG THE ~talttt 'o5t-lnfelligencer Re Advertiser Account #78871004 Ad # 706110900 Ad TEXT:K1NG COUNTY DEPT. OF DEVELOPMENT & ENVIRONMENTAL SERVICES (ODES) 900 Oakesdale Ave SW, Renton, WA 98055-1219 NOTICE OF LAND USE PERMIT APPLICATIONS REQUEST: SHOAT SUBDIVISION File: LOSS0057 Applicant: Pitzer Homes Inc Location: Located at 1183916th Ave So, Seattle Proposal: Subdivide 0.48 acre parcel into 4 lots in the R-6 zone. Project Manager: Chad Tibbits, 206-296-7194 COMMENT PROCEDURES: DOES will issue a decision on this application following a 21- day comment periOd ending on April 6, 2006. Written comments and additional information can be obtained by contacting the project manager at the phone number listed above. REOUEST: SHORT SUBDIVISION File: LOSS0004 Applicant: Kuei-Fang Yushan Location: Located at 15019 SE 44th St.. Bellevue Proposal: Subdivide 0.25 acre parcel into 2 lots in the R-6 zone. Project Planner: Chad Tibbits, 206-296-7194 COMMENT PROCEDURES: DOES will issue a decision on this application following a 21- day comment period ending on April 3, 2006. Written comments and additional in1ormation can be obtained by contacting the project manager at the phone number listed above. REQUEST: fORMAL SUBDIViSION File: LOSPOO22 Totem Green Subdivision Applicant: Yelm Property Development Location: Located at 12206 NE 144th St, Kirkland. Proposal: Subdivide 2.4 acres into 23 lots for single-family detached residences in the R-S zone. Program Manager: Chad Tibbits, 206-296-7194 REQUEST: FORMAL SUBDiViSION File: LOSPOO01 Cavalla Subdivision Applicant: KBS III, LLC Location: Located 13804 162nd Ave SE Proposal: Subdivide 9.23 acres into 34 lots for single family detached residences in the R-4 zone. Program Manager: Chad Tibbits, 206-296-7194 COMMENT PROCEDURES: Comments on the above files are now being accepted by King County DOES, Land Use -Services Division, at the -address listed above. Published this 2nd day of March, 2006. STA TE OF WASHINGTON, COUNTY OF KING } AFFIDA VIT OF PUBLICATION PUBLIC NOTICE lady Barton, being first duly sworn on oath that she is the Legal Advertising Representative of the King County Journal a daily newspaper. which newspaper is a legal newspaper of general circulation and is now and has been for mor~ than six months prior to the date of publication hereinafter referred to, published in the English language continuously as a daily newspaper in King County, Washington. The King County Journal has been approved as a Legal Newspaper by order of the Superior Court of the State of Washington for King County. The notice in the exact form annexed was published in regular issues of the King County Jownal (and not in supplement form) which was regularly distributed to its subscribers during the below stated period. The annexed notice, a Public Notice was published on March 2, 2006. The full amount of the fee charged for said foregoing publication is the sum of $358.50. ~ ;!'<ro,-..;."""""'~ --, ~-~'f 8Al..$' '" ---' :-;.;5-"''''''''. ~ ". ----:-'t'" .• "\(,":::.,':,\OIV !;.'J:· •• G t't ... • "\:~. ·1..0 • I ",. "-~~ . ..-0"· " o arton : :' 0 .. ;--\ ,~) i AF? i-' ,,-n"':. " Legal AdvertIsing Representative, Kmg County Journa~ : 0 ",~.,....c<:~ (.f) : ~ Subscribed and sworn to me this 2'" day of March, 20~. : : ~ ~ " (J"l....-.".. ... 0 ~ " rd •••. 1·' . ~i1 0··" :: " T;-' , •• u~!·iV,~.'.·_,0.: , II,,~ OF:W~S""\':~~-- Kathy Dalstt{ (J "h\\\\,,, ... ,,, ................ Notary PubYtc for the State of Washington, Residing in Covington, Washington PO Number: KING COUNTY DEPT. OF DEVELOPMENT & ENVIROl'>'MENTAL SERVICES (DDES) 900 Oakesdale Ave SW, Renton, WA 98055~1219 NOTICE OF LAND USE PERMIT APPLICATIONS REQUEST' SHORT SUBDIVISIQN File: L05S0057 Applicant: Pitzer Homes Inc Location: Located at 11839 16th Ave So, Seattle Proposal: Suhdivide 0.48 acre parcel into 4 lots in the R-6 zone. Project Manager: Chad Tibbits, 206~ 296-7194 COMMENT PROCEDURES: DDES will issue a decision on this appli- cation following a 21-day comment period ending on April 6. 2006. Writ- ten commenk: and additional infor- mation can be obtained by contacting the project manager at the phone number listed above. REQUEST: SHORT SUBDIVISION: File, L06S0004 Appli.cant: Kuci··Fang Yushan Location: Located at 15019 SE 44th St., Bellt:!vue Proposal: Subdivide 0.25 acre parcel into 210t8 in the H-6 zone. Project Planner: Chad Tibbits, 206~ 296-7194 COMMENT PROCEDURES, DDES will issue a decision on this appli- cation following a 21-day comment period ending on April 3. 2006. W rit.- ten comments and additional infor- mation can be obtained by contacting the project manager at the phonf! nwnbcr listed above. REQUEST, FORMAL SUBDIVISION File: L05P0022 Totem Green Sub- division Applicant: Yelm Property Devel- opment Location: Located at 12206 NE 144th St, Kirkland. Proposal: Subdivide 2.4 acres into 23 lots for single-family detached resi- dences in the R-8 zone. Program :'fanager: Chad Tibbits, 206-296-7194 REQUEST: FORMAL SUBDIVISION File: L06POOOl Cavalla Subdivisiun Applicant: KBS III, LLC Location: Located 13804 162nd Ave SE Proposal: Subdivide 9.23 (lcrp.s lnto 34 lots for single family detachp.d resi- dences in the R-4 zone. Program Manager: Chad Tibbits, 206-296-7194 COMMENT PROCEDURES, Com· ments on the above files are now being accepted by King County DDES, Land Use Services Division. at the address listed above Published this 2nd day of March, 2006. Publi:->hed in the King County Journal March 2, 2006. #848817 co~~ ~j)..\~ f\\.~ ~ <3 ~ \t. ~ 4: ~ Rogers, Carol From: Rogers, Carol Sent: Monday, February 27, 2006 2:58 PM To: 'Legals'; 'Iegals.bellevue@kingcountyjournal.com' Subject: Legal ads for publ. on Thurs 3/2, L05S0057,L06S0004,L05P0022,L06P0001 Please confirm receipt. Please publish the accompanying, legal notices in your newspaper on THURSDAY, March 2, 2006, which will meet our minimum legal notice requirement. Should this not be possible, please call or fax me immediately. Submit your invoice and 3 copies of the affidavit of publication to Accounts Payable, as soon after publication as possible, in order for us to enter legal proof of publication in our file records, and so that we may process same for payment. Attachment: Legal Notice KING COUNTY DEPT, OF DEVELOPMENT & ENVIRONMENTAL SERVICES (DDES) 900 Oakesdale Ave SW, Renton, WA 98055·1219 NOTICE OF LAND USE PERMIT APPLICATIONS REQUEST: SHORT SUBDIVISION File: L05S0057 Applicant: Pitzer Homes Inc Location: Located at 11839 16 th Ave So, Seattle Proposal: Subdivide 0.48 acre parcel into 4 lots in the R·6 zone. Project Manager: Chad Tibbits, 206·296·7194 COMMENT PROCEDURES: DDES will issue a decision on this application following a 21·day comment period ending on April 6, 2006, Written comments and additional information can be obtained by contacting the project manager at the phone number listed above. REQUEST: SHORT SUBDIVISION File: L06S0004 Applicant: Kuei·Fang Yushan Location: Located at 15019 SE 44th St., Bellevue Proposal: Subdivide 0.25 acre parcel into 2 lots in the R·6 zone. Project Planner: Chad Tibbits, 206·296·7194 COMMENT PROCEDURES: DDES will issue a decision on this application following a 21·day comment period ending on April 3, 2006, Written comments and additional information can be obtained by contacting the project manager at the phone number listed above. REQUEST: FORMAL SUBDIVISION File: Applicant: Location: L05P0022 Totem Green Subdivision Yelm Property Development Located at 12206 NE 144th St, Kirkland. Proposal: Subdivide 2.4 acres into 23 lots for single·family detached residences in the R·8 zone. Program Manager: Chad Tibbits, 206·296·7194 REQUEST: FORMAL SUBDIVISION File: Applicant: Location: L06P0001 Cavalla Subdivision KBS III, LLC Located 13804 162" Ave SE Proposal: Subdivide 9.23 acres into 34 lots for Single family detached residences in the R-4 zone. Program Manager: Chad Tibbits, 206·296·7194 COMMENT PROCEDURES: Comments on the above files are now being accepted by King County DDES, 1 M~NFI~CO" Land Use Services Division, at the address lio.ed above. Published this 2 nd day of March, 2006. cc: Accounts Payable, Administrative Services Division, DOES Application File(s): L05S0057; Pitzer Homes short plat application L06S0004; Yushan short plat application L05P0022; Totem Green subdivision application L06P0001; KBS III, LLC subdivision application Seattle Times acct #078871004 2 • RE: Legal ads for pub\. on Thurs 312, L05S0057,L06S0004,L05P0022,L06P0001 -Message (HTML) ,:. ~lIJ From: Jody Barton [jodf .b.!tt~ount'f.iounal,(om] Sent: Moo 02121/2006 3:04 PM To: R0QeI'5, Carol Cc: SUbject: RE; lega &CIs for~. on Thi.r$ 3/2, LD550D57,l06SOOJ4,lOSPOO22,106POOJl Hello CaroW I have received your email with the text and will publish the notice (re: lD5S0057, LffiS0C04, L05POO22 & L.(6PO)Jl) in the Thursday, February 2, 2OC6 edition althe King County Journal Thank youll Jod) Jody Barton ugal Advertism,g Representative Kmg County Journal 253-234-3506 (Work) 253-859-9737 (Fax) Hours: M-F 8-30arn -5:30pm "The happiest of people don't necessarily ha'l'e the best of e't'erything. th\?'f JUst make the best of everything that comes along their way," ----Origin~ M II $I; ag"----- FnlR: Rog"" Carol (mo.ilto:COlo1.RogtfS@METROKC,OOVJ s. .. , Mondoy. F.b!u6:y 21.2006 2,5& PM T.: 'Legtis'; 'lllgw.btUevue@'kingcountyjourna1.com' S"'ject: leg$! e.d$ fOf pubL on Thms3l2, LD5SOO57.L00SC0J4.LD5PlXJ12,LQ6POOJl PJe.'lse coltfirm f~C~;pt. Tuesday, Feb 28, 2006 07:24 AM User: rogersca Computer: DE235364 Os: Windows NT Version: 5.1 • RE: Legal ads for publ. on Thurs 31Z, L05S0057,L06S0004,L05P0022,L06P0001 -Message (HTML) ;.' l':l from: letJ$s [leo~¥:tletme-s,cc;rn] To: Rogers, C~oI Cc: 5UJject; RE: leQd ~ for pOOl, 041 Thurs3/2, LOSS0057,l065(X)'}4,105POO22,lWQ))1 Hi carol, Yovr Legal Notice reqvest vnder Ad # 3389423 IS scheduled to rvn Thursdoy, Morch 2. 2006 (Times oniy) for" 147,92. Thanks, Eleanor -----Or 9nal Message----- From: Rogers, Carol [mailto:C?roI,R~TROKC.GOV) Sent: Moo:Iay, Fet<uary 27,2006 2:58 PM To: legals; llegal$.bellEM.Ja@kirq:OL.I'lty'):Unal.com l SUbject: Legal ads for pml '" Thrs 3(2, LCI5S00S7,L06SOOl4,L05P0022,L06POOO1 PfalSe confirm f6ceipt. Please publish the accompanying, legal notices in your newspaper on THURSOAY. Maleh 2. 2006. which WIll meet our minimum legal notice requirement Should this not be possible, please cill or fax me inunediiltelv. Submit your imoice and 3 copies of the affidavit of publication to Ac.cowrtsPayahle, M MOil ~lft~H publication .1$ p(I$SiMoe-, In order for us to anter legal proof of publication in our file records, and so Ihat we may process same for payment. Attachment' Legal No1ice KING COUNTY DEPT. OF DEVELOPMENT Tuesday. Feb 28, 2006 07:23 AM User: rogersca Computer: DE235364 Os: Windows NT Version: 5.1 Department of Development and Environmemal Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 NOLlce of Application (Type 3) Applicant:: KBS III, LLC Attn. Kevin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 Agent: Barghausen Consulting Engineers Attn. Ali Sadr 18215 72 nd Avenue S. Kent, WA 98032 425-251-6222 File No.: L06P0001 -Cavalla Subdivision DOES Project Manager: Chad Tibbits, 206-296-7194 email: chadtibbits@metrokc.gov Date Application Filed: January 12, 2006 Date Determined Complete: February 9, 2006 Project Location: The site is located at 13804 162 nd Avenue SE. Project Description: This is a request to subdivide 9.23 acres zoned R-4 into 34 lots for single family detached residences and tracts for drainage facilities, access and recreation. The lots range from approximately 6,600 to 11,473 square feet. Permits requested in this application: Formal subdivision Relevant environmental documents are available at the address below: Environmental checklist and drainage study. Development regulations to be used for project mitigation, known at this time: KCC 21A., including critical area regulations, road standards and surface water design manual. Consistency with applicable County plans and regulations: This proposal will be reviewed for compliance with all applicable King County Codes, including those noted above Other permits not included in this application, known at this time: None A public hearing before the King County Hearing Examiner is required for this application. Notification of the public hearing date will occur approximately 30 days prior to the scheduled hearing date. The Department of Development and Environmental Services (DOES) will issue a report and recommendation to the Hearing Examiner two (2) weeks prior to the scheduled public hearing. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Details of the appeal process will be included in the notice of recommendation. Any person wishing additional information on this proposed project should contact the planner at the address listed above. Written comments may also be submitted to DDES. You may review the application and any environmental documents or studies in our Renton office. NOTE: If you require this material in braille, audio cassette, or large print, please call (206) 296-6600 (voice) or (206) 296-7217 (TIY). Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Mailing Date: March 10,2006 = ================================================= Please send me notification of the public hearing and other official notices concerning this application. File No. L06P0001 -Cavalla ( Please print) Name: __________________________________________________________________ __ AddffiSS: ________________________________________________________________ __ Telephone No.: King County has received an application to develop property at the address listed above. You are receiving this notice because our records indicate that you own property within approximately 500 feet of the proposal MAIN FILE COpy ~ ~ • , .1 , al~! I~~! ~Ij~ , , , I J , -, -j , I (UN/)("'l""'''') , I J ~ ,p~, ~U! " J ~~~I -, • !II ' '11;1: ! U~! . Oj~I, ~ g U2Jf»-9rub" Ll8E,'? TY HIGh' SCHOOL !..iNPLATT[D KBS DEVELOPMENT CORP. 12320 N,E, an-t STREET, STE 100 BELLEVUE, WA 98005 Mo, Dot.:!Iy ic... _. -PRELIMINARY PLAT FOR CAVALLA ,. ." 0 :D oj 0 Z s;: J:' m ~ 7<'" 15 ~ n g~ ~ ~6 ~ ",Z ,. " t'"' "'~ ~ IO 15~ §'E "6 '" '" Z :D ,. ~ ~ ,m '" <: ." iii ~I ." ): -< ® Deparunent of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Applicant:: KBS III, LLC Attn. Kevin Taylor No1..~e of Application File No.: L06P0001 -Cavalla Subdivision (Type 3) 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 DDES Project Manager: Chad Tibbits, 206-296-7194 email: chad.tibbits@metrokc.gov Agent: Barghausen Consulting Engineers Attn. Ali Sadr 18215 72,d Avenue S. Kent, WA 98032 425-251-6222 Date Application Filed: January 12, 2006 Date Determined Complete: February 9, 2006 Project Location: The site is located at 13804 162,d Avenue SE. Project Description: This is a request to subdivide 9.23 acres zoned R-4 into 34 lots for single family detached residences and tracts for drainage facilities, access and recreation. The lots range from approximately 6,600 to 11,473 square feet. Permits requested in this application: Formal subdivision Relevant environmental documents are available at the address below: Environmental checklist and drainage study. Development regulations to be used for project mitigation, known at this time: KCC 21A., including critical area regulations, road standards and surface water design manual. Consistency with applicable County plans and regulations: This proposal will be reviewed for compliance with all applicable King County Codes, including those noted above Other permits not included in this application, known at this time: None A public hearing before the King County Hearing Examiner is required for this application. Notification of the public hearing date will occur approximately 30 days prior to the scheduled hearing date. The Department of Development and Environmental Services (DOES) will issue a report and recommendation to the Hearing Examiner two (2) weeks prior to the scheduled public hearing. Following the close of the public hearing, the Hearing Examiner will issue a written decision which may be appealed to the Metropolitan-King County Council. Details of the appeal process will be included in the notice of recommendation. Any person wishing additional information on this proposed project should contact the planner at the address listed above. Written comments may also be submitted to DOES. You may review the application and any environmental documents or studies in our Renton office. NOTE: If you require this material in braille, audio cassette, or large print, please call (206) 296-6600 (voice) or (206) 296-7217 (TTY). Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 Mailing Date: March 10, 2006 Please send me notification of the public hearing and other official notices concerning this application. File No. L06P0001 -Cavalla ( Please print) Name: ______________________________________________________________________ __ Address: ___________________________________________ __ Telephone No.: King County has received an application to develop property at the address listed above. You are receiving this notice because our records indicate that you own property within approximately 500 feet of the proposal r , =, -- " . \ ,,."" -l'------+-----;. --~-I-- I ! i . ! i , '"" 1 .;". "IOtI':zl'~'!:.l27.U '. ;~~!! " • i!~! : • ~ ",I !!U ~ ". ~ I I , - ~ < ~ I "'.<:1 0, 0 i , • " " , , ~~ '''11:\ 16215 12ND AVENuf SOUT~ ........ ~ ~ KENT WA 96032 Dntw<. """- (425)251-6222 ; (425)251-8782 FAX a.-.... ,IS :! --""" ~N'l"'i.t.~" , ~I~! ~~~ ~~~; J "j C9; ~U! 't. / _,;..,'-1-:-'r;---1;J!'~_7 \»~~'>li1 "I .. >. . ~(( :..1t~~~_~~~~~4:~~;;~~§~~~ .,', ---' , ! , 0. , ~ , '" ~ ~ ." ~ ~ " ~ 3 ~ ~ C9, ~ ~ " • • UBERty HiGH SCflOOL 'iNPL.ATT[t) KBS DEVELOPMENT CORP. 12320 N.E. 8lH STREET, STE 100 BELLEWE. WA 98005 i ! PRELIMINARY PLAT FOR CAVALLA , " (f) --'" I.L! 0 0 0 8 0 ~ ~ 0 .-J BARGHAUSEN CONSULTING ENGINEERS ALI SADR 18215 72ND AVE SOUTH KENT W A 98032 CLAUSSEN, KIM PROGRAM MANAGER III MS: OAK -DE-0100 DDES/LUSll IlINSMORE, LISA CURRENT PLA"INING SUPERVISOR MS: OAK -DE-0100 DDES/LUSD GILLEN, NICK CRITICAL AREA SECTION-WETLAND REVIEW MS: OAK -DE-0100 IlIlES/LUSD KBS III LLC KOLIN TAYLOR 12320 NE 8TH ST, SUITE #100 BELLEVUE WA 98005 LAJ\GLEY, KRIS fRAFFIC ENGINEER MS: OAK -DE-0100 DDFS/LUSIl MIY A KEITH AND ANN 5515 NE I ST CIRCLE RENTON WA 98059 ROGERS, CAROL ClJRRENT PLANNING SECTION MS: OAK -DE -0100 DDES/LlJSD TIBBITS, CHAD PROJECT MANAGER 11 MS: OAK -DE-0100 DDES/LlJSD L06POOOI L06POOOI L06POOOI L06POOOI L06POOOI L06POOOI L06POOOI L06POOOI L06POOOI WEST. LARRY CRITICAL AREA SECTION-GEO REVIEW MS: OAK ~ DE -0100 DDESILUSD WHITTAKER, BRUCE SR. ENGINEER MS: OAK -DE-0100 DDES/LlJSIl L06POOOI L06POOOI .. • 1457500127/L06POOOl BOSANCU CRISTIN AMAR+EUZABETH H 11020 SE 223RD #B KENT WA 98031 PL33/L06POOO 1 CITY OF RENTON ECONOMIC DEVELOPMENT DIVISION 1055 SOUTH GRADY WAY RENTON WA 98055 4306500100/L06POOOI COLUER-KERSTETTER DEBRA+ MICHAEL S KERSTETTER 16219 SE 137TH PL RENTON WA 98056 4306500110/L06POOOl HAAS MICHELE T 16211 SE 137TH PL RENTON WA 98059 4306500050/L06POOOl KEENE MICHAEL & JENNIFER 16234 SE 137TH PL RENTON WA 98059 4306500030/L06POOOI KNUTSON ERIC E+KNUTSON MEUSSA R 16218 SE 137TH PL RENTON WA 98059 4306500020/L06POOOI LAWRENCE JOHN R 16210 SE 137TH PL RENTON WA 98059 1457500126/L06POOOI MCKENDRY JAMES J STEWART DEBORAH J 16207 SE 136TH ST RENTON WA 98059 1457500140/L06POOOI MIYA KEITH L+ANN E 223 BREMERTON AV SE RENTON WA 98059 1457500150/L06POOOl PETRIE RAHUL B 811 S 273RD CT DES MOINES WA 98198 1457500096/L06POOOl BOWDEN EDWARD & SHARON I 3939 SE 10TH PL RENTON WA 98058 PL50/L06POOOl CITY OF RENTON DEVELOPMENT SERVICES DIVISION 1055 SOUTH GRADY WAY RENTON WA 98055 UAC-FC/L06POOOI FOUR CREEKS UNINCORPORATED AREA COUNCIL PO BOX 3501 RENTON WA 98056 4306500010/L06POOOI HERRIN BRADLEY J 16202 SE 137TH RENTON WA 98059 4306500130/L06POOOI KING COUNTY 500 KC ADMIN BLDG 500 4TH AV SEATTLE WA 98104 1457500085/L06POOOI LAKERIDGE DEVELOPMENT INC PO BOX 146 RENTON WA 98057 1457500095/L06POOOl LEE STEVEN P 13802 160TH AV SE RENTON WA 98059 1457500100/L06POOOI MCNAIR DANNY M PO BOX 18914 SEATTLE WA 98118 1457500125/L06POOOI MORGAN JEROLD R+SUZANNE L 16327 SE 136TH ST RENTON WA 98059 1457500145/L06POOOI PETRIE RAHUL B+ARVIND J 811 S 273RD CT DES MOINES WA 98198 1457500106/L06POOOl BRENDON MILTON M GEROS VIRGINIA M 18225 SE 128TH RENTON WA 98055 4306500080/L06POOOl COLUER JAMES 16235 SE 137TH PL RENTON WA 98059 4306500120/L06POOOl GROVER RAYMOND E+MARYHELEN 16203 SE 137TH PL RENTON WA 98056 1323059038/L06POOOI ISSAQUAH SCHOOL DIST #411 565 NW HOLLY ISSAQUAH WA 98027 1323059095/L06POOOI KING COUNTY 500 KC ADMIN BLDG 500 4TH AV SEATTLE WA 98104 1457500090/L06POOOl LAKERIDGE DEVELOPMENT INC PO BOX 146 RENTON WA 98057 1323059039/L06POOOl LOVEGREN MARK 16405 SE 136TH ST RENTON WA 98059 4306500040/L06POOOl MINTY WALTER E+SHIRLEY B 16226 SE 137TH PL RENTON WA 98059 1457500135/L06POOOl NGUGEN ANN M PO BOX 5111 KENT WA 98064 4306500070/L06POOOI REYNOLDS WILUAM B+DEBBIE S 16241 SE 137TH PL RENTON WA 98059 4306500060/L06POOOl SCHILD KEITH A+DIEM TRANG N 16240 SE 137TH PL RENTON WA 98059 CG2/L06POOOl SUSAN SULUVAN 24311 SE 47TH ST ISSAQUAH WA 98029 1457500101/L06POOOl WILMOT ROBERT C+CAROL LYNN 13900 160TH SE RENTON WA 98059 1457500110/L06POOOl SMITH GERALD C 8524 S 125TH RENTON WA 98055 1457500097/L06POOOl THATCHER JESSE T +ERIN N 13817 162ND AV SE RENTON WA 980S9 ~D8/L06POOOl STEVE CRAWFORD, NEW CONSTRUCTION ISSAQUAH SCHOOL DISTRICT #411 565 NW HOLLY ST ISSAQUAH WA 98027 4306500090/L06POOOl VANKOOTEN KENNETH D & WENDY L 16227 SE 137TH PL RENTON WA 98059 (E Renton) FD25 (Spring Glen) FD40 Fire Protection Dist #25 Fire Protection Dist #40 P.O. Box 2925 10828 SE 176th St Renton WA 98056-0925 Renton WA 98055 MS: KSC-NR-0600 MS: KSC-TR-0431 KG7 Water & Land Res. Div Gary Kriedt King County Dept. of Natural Res. KC Metro Envirn. Planning Steve Foley 1115 U20 Fairwood Library Highlands Library 17009 -140th Av SE 2902 NE 12th St Renton WA 98058 Renton WA 98056 U23 Documents Dept. Librarian U24 Kent Regional Library King County Library System 212 - -2nd Av N 960 Newport Way NW Kent WA 98032-4482 Issaquah, WA 98027 U36 ATTN: Edward White PL18 Renton Library Kent Engineering Dept 100 Mill Av S 220 -4th Av S Renton WA 98055 Kent WA 98032 PL19 City of Renton PL33 Kent Planning Dept Economic Development Dept. no -4th Av S 1055 S. Grady Way Kent WA 98032 Renton WA 98055 Clinton G. Marsh, Director Fac. & Const. Dept SD9 R. Stracke, Facilities & Ping SD13 Kent School District # 415 Renton School Dist # 403 12033 SE 256th st. Bldg B 1220 N 4th St Kent WA 98031-6643 Renton WA 98055 Administrator SE5 Environmental Review Section ST2 Kent Sewer Utility WA State Dept of Ecology no -4th Av S PO Box 47703 Kent WA 98032 Olympia WA 98504-7703 Habitat Biologist, Rod Malcom TR1 Russ Ladley, Fisheries Biologist TR2 Muckleshoot Indian Tribe Puyallup Tribe 39015 -172nd Av SE 6824 Pioneer Wy E Auburn WA 98002 Puyallup WA 98371 TR3 Fisheries Habitat/Environment TR5 Snoqualmie Tribe Suquamish Indian Tribe PO Box 280 PO Box 498 Carnation WA 98014-0280 Suquamish WA 98392 Richard Young Tulalip Tribe 7615 Totem 8each Rd Marysville WA 98271 Public Works Dtr Kent Water Dist 220 -4th Av S Kent WA 98032 Soos Creek Water/Sewer Dist PO Box 58039 Renton WA 98058-1039 Coal Creek Utility District 6801 132nd Place SE Newcastle, WA 98059 WA State Dept. of Wildlife 16018 Mill Creek BlVd. Mill Creek, WA 98012 WA State Dept. of Ecology NW Regional Office 3190 -160th Ave SE Bellevue, WA 98008-5452 WA St. Ecology Dept/WQSW Unit Linda Matlock PO Box 47696 Olympia, WA 98504-7696 Eleanor Moon KC Executive Horse Council 12230 NE 61st Kirkland, WA 98033 TR4 WD23 WD41 WD57 WD12 Cedar River Water/Sewer Dist 18300 SE Lk Youngs Rd Renton WA 8058-9799 City of Renton, Public Works Dept. WD32 Development Services Div. 1055 South Grady Way Renton WA 98055 WD55 Water Dist #90 15606 SE 128th St Renton WA 98059-8522 WD58 Water Dist #111 27224 -144th Av SE Kent WA 98042-9058 WA State Dept. of Wildlife Habitat Mgmt. Division P.O. Box 43155 Olympia, WA 98504-3155 WSDOT NW Region SnoKing Area MS-240 15700 Dayton Ave No. PO Box 330310 Seattle, WA 98133-9710 Roger Oorstad PO Box 375 Redmond, WA 98073 CIVI~ Er~GINtl:.RING. Lt',ND PLNmING. SURVEYIi\IG, ENVIROr'jME~HAL SERVICES Kim Claussen Project/Program Manager III King County Department of Development and Environmental Services 91J0 Oakesdale Avenue S, W, Renton, WA 98055-1219 RE: SubmiLtal for Preliminary Plat of Cavalla 13930 ~ 13804 ~ 162nd Avenue SF King County, Washington J anuury 12, 2005 King County DDES File Nos, A05PMI34 and A05PM066 Our Job No, 11778 Dear Kim: o b\,:;lSU 'J lS 0) ~ rc; rc; f2 n Wlf O' r~ JAN 1 2 2006 I_J K.C. D.D.E.S. On behalf of KBS Development Corporation, I have prepared a complek application for the proposed plat of Cavalla, This project consists of two five-acre parcels that were submitted as individual proposals by two different applicants (Pre-Application File Nos, A05PM134 and A05PM066), KBS Development Corporation has now purchased (or has under contract) both parcels and therefore, elected to submiL Lhe application as one proposal with 34 lots. The following information is enclosed for your use in processing this application: 1. One original and two copies of the Land Use Permit Application signed hy the property owners 2, One set of current Assessor's Maps of the property to be subdivided and all properties within 500 feet of the project 3, Three copies of the projccllegal description on 8.5-by II-inch paper 4, One copy of the proof of legal lot stalus 5, One original and 24 copies of the completed King County Environmental Checklist 6, Three copies of the Certificate of Water Availability from King Counly Water District 90 dated February 22,2005 and 'Vlarch 14,2005 7, Three copies of the CertificaLe of Sewer AvaiiabiliLY from the CiLY of Renton dated November 16, 2005 8, Thirty-five copies of the proposed preliminary plat prepared by a licensed land surveyor 9, One copy of the preliminary plat map reduced to 8,5-by 14-inches 10. Three copies of the Fire District receipt L OCoPQOO 1_ COt''' 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX flAp-\ll f\\..\:. (Dr. BRANCH OFFICES • OLYMPIA, WA • TEMECULA, CA • WALNUT CREEK, CA www.barghausen.com .' .. Kim Claussen Project/Program Manager III King County Department of Development and Environmental Services -2-January 12,2005 II. Eight copies of the Level I Drainage Analysis prepared by Barghauscn Consulting Engineers. Inc., dated December 21. 2005 12. Three copies of the Transportation Certificates of Concurrency oated March 8, 2005 and December 16, 2005 13. Three copies of the subdivision density and dimensions worksheet 14. Three copies of the Certificate/Affidavit of Sensitive Area Compliance from both property o\vners 15. Three copies of the applicant status form from each property owner 16. One check for $18,082.31 made payable to the King County Office of Finance 17. Three copies of the project title report prepared hy Chicago Title Insurance Company dated December 22, 200S 18. Eight copies of the field topographic base maps prepared by Kenneth R. Anderson and Associates Inc., and D.R. Strong 19. Eight copies of the preliminary road and drainage plan 20. Eight copies of the adjacent property owner's plan 2 I. Eight copies of the tree survey plan The proposed project docs not appear to have significant issues. We have taken into account comments received at both pre-application meetings. I believe the enclosed documents adequately adelress the County's comments. Should you have questions or neeel additional information, please contact me at this office. Thank you. GWP/um 11778c.004.doc ene: As Noted Respectfully, ,~ (/~' 2 S8 . , . G. Wayne Potter Project Manager cc: Curtis Schuster, KBS Development Corporation (w/ene) ,. ® King County Department of Development and Environmental Services Land Use Services Division - Web date: 08/30/2005 ~~fON 900 Oakesdale Avenue Southwest Renton, Washington 98055·1219 206·296--6600 TIY 206·296·7217 For alternate formats. call 206-296-6600. Staff Use Only -Do not write in this box ~~A:~~~: 0 Application Lo(oPOOOI I (We) request the following permit(s) or approval(s): o Building Permit o Road Variance o Clearing & Grading Permit 0 Drainage Variance or Adjustment o Temporary Use Permit o Binding Site Plan o Site Development Permit o Boundary Line Adjustment o Short Subdivision ~ Formal Subdivision o Urban Planned Development o Plat Alteration o Plat Vacation o Right·of-Way Use Permit o o Shoreline Exemption Critical Areas Alteration Exception o Linear o Non·linear o Shoreline Substantial Development Pennit o Shoreline Conditional Use Permit o Shoreline Variance o Shoreline Redesignation K.C. D.D.E.S. Date Received (stamp) II!! o Zoning Variance o Conditional Use Permit o o o o o o o o o Reuse of Public Schools Special Use Permit Zone Reclassification Site Specific Comprehensive Plan Amendment P-Suffix Amendment Special District Overlay Removal Reasonable Use Exception Public Agency & Utility Exception Period Review for Mining Sites I, Ke.--\1l. thlD A/J/J dliylr ,being duly sworn. state that I am the owner or officer of the corporation owning property described in the legal description filed with this application and that I have reviewed the rules and regulations of the Departrnent of Development and Environmental Services (DDES) regarding the preparation and filing of this application and that all statements. answers and information submitted with this application are in all respects true, accurate and complete to the best of my knowledge and belief. During the review of this application, it may be necessary for DDES staff to make one or more site visits. By signing this application form, you are giving permission for these ViSi~S' If ii,s rental property, the owner hereby agrees to notify tena~ts of possible site ~isitS. " . ~-/J. / /~/. . Printed Name /(t:l1"ft fiND AI/A) (fI,¥/'r Signature ..... ~ ~ ~ $'1'---" Company .~r---------~~--------------------------------~------------------------- Phone fa? ol)~. fgtlj(} E-mail ~~~~~~~~~~~~~~~~~~~~~- Mailing Address .;,2?~ 7i,.....118,-q~i<J ,4\' ~ RelJTDfJ W!r CZIOS'j STREET ~Sl) pi /5/ c//C{c,IZ CITY ST ZIP If applicable, state below the name. address and telephone number of the authorized applicant for this application as shown on the Certification and Transfer of Application Status form filed with this application. Name t::s..s 1IC LLC.-j,(r;t.p;p". rif~'_L_vA(~'~~~~~~~~~~_ Phone .J.c:& -"2.3 -'1 COD E·mail --~~~~~--~~--~------~~~~~~~- Mailing Address /2J.;lo IVr:;. ~ Soli"", [(X) & {(eolUl.. STREET CITY AppForlandUsePermitsFORM.doc Ic-app-Iuper .pdf 0813012005 ,. For Formal Subdivisions only: CA -J PrLi...Jlr NAME OF SUBDIVISION 88(eMt.t5e.1 CcNsuaf~ ~.lAJc. REGISTERED LAND SURVEYOR NAME 11J..I:{' 7201D AYe:-S STREET ADDRESS KeNl CITY STATE ZIP TELEPHONE ENGINEER NAME STREET ADDRESS CITY STATE ZIP . 2sl· to;z.;u. TELEPHONE DEVELOPER NAME /:23,)0 M. r->TI(fi'er Sf/$/<XJ Land Surveyor's Certification I hereby certify that the accompanying plat has been inspected by me and conforms to all rules and regulations of the platting resolution and standards for King County, Washington. SIGNED DATE The fees for the application will be paid: STREET ADDRESS CITY STATE ZIP ')oe; .0~3 . ')000 TELEPHONE Land Surveyor Seal D deposit at submittal and remainder to be paid upon receipt of fee estimate (B'" deposit at submittal and remainder through a monthly installment plan (maximum of 9 months). Note: Application forms and submittal requirements are subject to revision without notice. Check out the DDES Web site at www.metrokc.qov/ddes AppForLandUsePermitsFORM.doc Ic-app-Iuper.pdf OBt;10/2005 Page 2 of 2 11-23-05 DB;3IA~ FROM-Davis Real Estate Group 4Z5ZZ69ZZT T-5Z9 P.OOZ/005 F-902 D .. o ~2 O~ uii.bla , . i 1<> p. l • Web dfiU~ Cl8/3OI2IJC~ King' Counry o.partmen, or DC:V~'D~lr'I"'.'i.l'lllr"l F.l1vlra"",illnt;,J ~MIiI"'1!r. Lan<l 1,1'&9 SV-MCO= I,)M~lon Q pPLICATION FOR -1 LAND USE PERMITS .I ---_ ... ,. . .. 000 O.k.~l3'e AW'enue &.II'IW05t R.lVllon. w""hlngtgn .oeCSS-'~19 :1.0fl.,.2~ TTY ~""_"""_72" For alternlltla fo/mElt:;, call ?06~2!l6-S60D AppliCQ U(1) _~_. 4 ._~. _______ ........ _._ r~~ -:-:;~ , .. nb NOT.WRrrl!.-AlIoVE nus giVrog!L..... I (WD) requ=t In,.,1r,lIo;,wing perm'l(s} Or approvu'(sj: Date. Received ( .. t .. ~ .'. " .,.:..:..-.... o aLlUdl"IJ I''''''lit C Rcac\ ''''''>In....-Cl .z0"""9 Varu.nco o CI~"flnll 8. GtlOdlnu "''''''''iI [J Ol"llnQQo V",fence Or A<Uu<irm.nl U ConQlllu"," u~" 1'01"'11 n T"mPQ"IJy Un" Pgrmlt 0 Rlgh'-<.>r-w~~ U".. PRmril n R"~O·. of public G"I'I"",'.; o Blnaln~ I'll ... P"'n 0 SNorcltr.e l;;Xemp!ion 0 S~I'" US<! Permit D s~" Oouglopment f><:rrnH 0 Orlll"",1 At""" Al'"",lIon ~pt'on n Zane Recl .... 'lncalion o acu~d.ry LIt> .. AuJuslmen' 0 Woe .. , 0 Silto sF"clfto CGmptellllt\Slvo f'lan /lmondmcnl o ~hQ,.t liZ:ubl;ll\V13lcI"\ tJ N\II r-l" Ir.ctl W P-AufFJx An'lli!Indnlent 18l [7ermal :;"Odlul~lon Cl Ilht>reline Gllbounflul o.. •• tlpmIMI perm,l CJ SDeCl." [.ll&triel OveriBV Rem"",,) U urhn I"ItlnMd U~'elcp""'nt U sncr."n~ Condftlanal u ... P .... mll 0 R""' .... ,...w .. U$O .. ......"lIOn o Fllml Alh·"'.:..tJon D Ohcrwfint't V#lI'~'Dj 0 I-'ubflc Agency & LltIllt)l E);r.Af'l-ll<".1'. o j::Il;;llt vaJ;l3tlon U ShuMJ,n& f<,&dec'!fOiltJon 0 P~til,)d Ftsvlvw 10r Mining Sttao r, ~p _ • h#1if'O II.luly .worn. etata that J t'l:m ,he owner or officer of the COrpOTQ!lQII oINnl"'g P'''P<>rlY decQnbe<l1n tile 1e1l,,1 r." •• orlp~O" r~""" WI1l1 thle "ppll""~Q" "n<llh"~) have ravl<>w"d tJ1Q rule~ "noi ,.,uul.UQ"" Cfthe IlSpBrtment ,,/ t'levo:>,opm .. n1: and Snlllrnr.mo;:ntO)I!:l"rvr~ .... (OOr.:fl) ,gll"rCllng thCl prep .. , .. !;"" "rod ~lIng ofthi;> Bllplicaticn 11M lhal<ln ~ta"'m81'116. 3naW.,ro and Infarm"t'nn $lIhmltled WlU1 In,s o.opllel!lon .. "" i'r .. II rn6~.= ",uo, accurah> Ann """'p'<I(Q to Ih<I b .. <;t of 0Iil' Imowledll'" ",..j bell .. r. 08:31AM FROM-Davis Real Estate Group For Formal Subdivisions only: C-AIIALL/r NAME OF SUBDIVISION REGISTERED LAND SURVEYOR ENGINEER DEVELOPER Land Surveyor's Certification f hereby certify that the accompanying plat has been inspected by me and conforms to all rules and regulations of the platting resolution and standards for King County, Washington. S,ONEO DATE The fees for the application will be paid: 4252269227 T-529 P.003/005 F-902 NAME I 82 (;5' 1)~ kvt::. .s STREET ADDRESS Ke.u, IdA- CITY STATE ZIP TELEPHONE NAME lfus '1J."o ~S STRE5T ADDRESS Ke/J,\ WA Cfr03:L CITY STATE ZIP TELEPHONE NAME I l.3c2.0 Ni5 &"'" Su,'k /00 STREET ADDRESS Be fCe Ilk<!-:: CITY STATE ZIP -blS -') ddo TSLEPI'IONE Land Surveyor Seal o deposit at submittal and remainder to be paid upon receipt of fee estimate lfdeposit at submittal and remainder through a monthly installment plan (maximum of 9 months). Note: Application forms and submittal requirements are subject to revision without notice. Check out the DDES Web site at www_metrokc,govlddes AppForlandUsaParmltsFORM 'e-app~ruper.pdf 08/J0I2005 Page 2 of 2 - eVil ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SI::RVICES Kim Claussen Project/Program Manager 1Il King County Department of Development and Environmental Services 900 Oakesdale Avenue S.W. Renton, WA 98055-1219 RE: Submittal for Preliminary Plat of Cavalla 13930 -13804 -162nd Avenue S.E. King County, Washington January 12,2005 King County DOES File Nos. AOSPM134 and A05PM066 OurJ ob No. 11778 Dear Kim: ~I~'(~'I= I~I'~ o I ~--" D) JAN 1 2 2006 i_--" K.C. D.D.E.S. On hehalf of KBS Development Corporation, T have prepared a complete application for the proposed plat of Cavalla. This project consists of two five-acre parcels that were submitted as individual proposals by two different applicants (Pre-Application File Nos. A05PM134 and AOSPMOGG). KBS Development Corporation has now purchased (or has under contract) both parcels and therefore, elected to submit the application as one proposal with 34 lots. The following information is enclosed for your usc in processing this application: l. One original and two copies of the Land Use Permit Application signed by the property o\vners 2. One set of current Assessor's Maps of the property to be subdivided and all properties within sao feet of the project 3. Three copies of the project legal description on 8.5-by II-inch paper 4. One copy of the proof of legal lot status 5. One original and 24 copies of the completed King County Environmental Checklist 6. Three copies of the Certificate of Water Availability from King County Water District 90 dated February 22, 2005 and March 14,2005 7. Three copics of the Certificate of Sewer Availability from the City of Renton dated November lG, 2005 8. Thirty-five copies of the proposed preliminary plat prepared by a licensed land surveyor 9. One copy of the preliminary plat map reduced to 8.5-by 14-inches 10. Three copics of the Fire District receipt L oeoPooo I ..... "COt''> 18215 72ND AVENUE SOUTH KENT. WA 98032 (425) 251-6222 (425) 251-8782 FAX MII-nol f\\"t'.@v:. BRANCH OFFICES • OLYMPIA, WA • TEMECULA, CA • WALNUT CREEK. CA www.barghausen.com Kim Claussen Project/Program Manager III King County Department of Development and Environmental Services -2-January 12,2005 II. Eight copies of the Level I Drainage Analysis prepared by Barghausen Consulting Engineers, Inc., dated December 21. 2005 12. Three copies of the Transportation Certificates of Concurrency dated March 8, 2005 and December 16, 2005 13. Three copies of the subdivision density and dimensions worksheet 14. Three copics of the Certificate/Affidavit of Sensitive Area Compliance li·om both property owners 15. Three copies of the applicant status form from each property owner 16. One check for $18,082.31 made payable to the King County Office of Finance 17. Three copies of the project title repon prepared by Chicago Title Insurance Company dated December 22, 200.') 18. Eight copies of the field topographic base maps prepared by Kenneth R. Anderson and Associates Inc., and D.R. Strong 19. Eight copies of the preliminary road and drainage plan 20. Eight copies of the adjacent property owner's plan 21. Eight copies of the tree survey plan The proposed project does not appear to have significant issues. We have taken into account comments received at both pre-application meetings. I believe the enclosed documents adequately address the County's comments. Should you have questions or need additional information, please contact me at this office. Thank you. GWP/dm 11778c.004.doc enc: As Noted Respectfully, JAj'v, ~ Sil 0w~:~- G. Wayne Potter Project Manager cc: Curtis Schuster, KBS Development Corporation (w/enc) Web date· 12/05/2005 ® PRELIMINARY SUBDIVISION APPLICATIONS: King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296-6600 TTY 206-296-7217 General Information Instructions For alternate formats, call 206-296-6600. The following is a summary of the preliminary subdivision application process and a description of the application submittal requirements. The information required for a preliminary subdivision application is necessary in order to evaluate the merits of a proposal with applicable County and State regulations and to assess the potential environmental impacts. The environmental checklist will be the basis for determining if an environmental impact statement will be required prior to any approval of a proposed subdivision. An application will be evaluated on the basis of the information provided by the applicant, the King County Comprehensive Plan, pertinent provisions of the King County Code, site inspection, testimony and evidence presented at the public hearing, and comments submitted by interested public agencies. Copies of the King County Codes and Comprehensive Plan are available for inspection at the DOES Permit Center and at the Main Branch of the Seattle Public Library. King County Codes and other development regulations also are available via the King County Web site at www.metrokc.gov and DOES application forms are online via the DOES Web site at www.metrokc.gov/ddes. Questions related to preliminary subdivisions may be answered by calling or contacting: Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 Telephone: 206-296-6600 Pre-Application Conference A pre-application conference with Land Use Services Division (LUSD) staff is required prior to filing a subdivision application. Pre-application request forms and instructions for filing a pre-application conference request are available at the DOES Permit Center. A filing fee is required at the time a request is made, the amount to be determined at the time of the filing and based on the latest adopted fee ordinance. LUSD staff will schedule the pre-application conference within thirty (30) days from the date of the request. Filing an Application A subdivision application must be filed in person at the DOES Permit Center. An appointment with a Zoning Technician is required to file the application. Please call 206-296-6797 to schedule the appointment. The minimum submittal requirements necessary to file the application are described below, under Application Documents. LUSD staff has twenty-eight (28) days from the date of filing to determine whether or not the application is complete. An application that fails to meet the submittal requirements described herein will be deemed incomplete. P rei i mSubd ivApp Instructions .doc Ic-ins-psubap.pdf 12105/2005 L OCt, P ()OO/ Notice of Application Fourteen (14) days after LUSD staff determines that the application is complete, a public notice is issued as follows: A LUSD sends out a notice of application to property owners within a 500-foot radius of the subject property. If the area is rural or lightly populated, the notice must be mailed to at least 20 different property owners; or, in other appropriate cases, the Division may determine it is necessary to notify additional property owners. B. A notice of the application will be published by LUSD in the official county newspaper and another newspaper of general circulation. C. The applicant is required to install a notice board, which must be placed in a conspicuous place on the property throughout the permit process so that it is visible to people passing by the property. Additional notice boards may be required as determined by LUSD. The cost of the board is the applicant's responsibility. LUSD will send the applicant written instructions regarding the specific requirements for the notice board. D. Notice of the application is also provided to anyone who writes to the Division requesting information regarding the proposal. Compliance with the State Environmental Policy Act (SEPA) Proposed subdivisions are subject to the procedural and substantive requirements of SEPA (see WAC 197-11 and K.C.C. 20.44). Prior to the public hearing on the subdivision, DOES will issue its SEPA threshold determination, which is appealable to the Hearing Examiner. If the DOES determination of non-significance (DNS) or mitigated determination of non-significance (MONS) is appealed, the SEPA appeal hearing is combined (i.e., heard at the same time) with the subdivision hearing. Public Hearing A public hearing will be held by the King County Hearing Examiner at which time all evidence supporting or opposing the proposal will be heard. LUSD will issue a written report and recommendation 14 days prior to the scheduled hearing date. As mentioned above, if a SEPA appeal is filed, the SEPA appeal hearing will be heard by the Hearing Examiner at the same time as the subdivision hearing. If other applications, such as a rezone, shoreline substantial development permit, and/or street vacation are proposed or required in conjunction with the subdivision, they may be scheduled for the same hearing. The Hearing Examiner will render a written decision, which is appealable to the King County Council. Appeal Affected parties may appeal the Hearing Examiner decision on a preliminary subdivision to the King County Council. The Examiner's report includes information on the method of appeal available and the time limit within which an appeal must be filed. Prel i mSubd ivApp I nstru ctions .doc Ic-ins-psubap.pdf 12/05/2005 Page 2 of 6 Preliminary Approval/Disapproval Preliminary approval or denial by the Hearing Examiner is final unless appealed to the King County Council. If appealed, the King County Council will render a final decision. An appeal of the Council's decision may be filed with the King County Superior Court. Final Approval The final plat must be recorded within sixty (60) months of the effective date of the preliminary approval. Application Documents Required for Submittal The following documents are required to be submitted at the time an application is filed in order to be determined complete. v< Land Use Permit Application: Complete and submit one original plus two (2) copies. , ~. vr Assessor's Maprs): Submit one set of current Assessor's maps of the property to be V ! subdivided, including adjoining properties under the same ownership as the property being subdivided. The map(s) must cover all properties within 500 feet of the subdivider'S ownership. Outline the boundaries of the proposed subdivision in red. Outline adjoining ownership in yellow. If Assessor's maps are stamped "see enlargement," include the enlargement copy with your application. Prints of the Assessor's maps must be ordered from the Department of Assessments, Room 700A, King County Administration Building, 500 -4th Avenue, Seattle, WA, phone 206-296-7300. 4 V Legal Description: Submit three (3) copies, typewritten on sheet size 8%" x 11", white bond -( paper. The legal description of the subject property may be obtained from the office of the King /j( County Assessor. The legal description must correspond precisely with property outlined in red on the Assessor's map. Proof of "Legal" Lot Status: Submit documentation of the date and method of segregation of the subject property. , ~. Environmental Checklist: Submit twenty (24) copies. Please refer to instruction on the Environmental Checklist form. The applicant will be contacted by the Land Use Services Division if additional information is required. Failure to respond may cause postponement of consideration of your request. If an EIS has been ~' prepared for this proposal, please submit three (3) copies with your application. 6'1;certificate of Water Availabilitv: Submit three (3) copies. I Preliminary approval for the creation of a new water system in accordance with the provisions of the applicable Coordinated Water System Plan or for the connection with a private well from the Seattle-King County Department of Public Health; or PrelimSubd iv Appt nstruction s. d oc lc-ins-psubap.pdf 12/05/2005 Page 3 of 6 b. ~8. if' JVffO. The Certificate of Water Availability form conceming water availability to the site must be given to the appropriate existing water purveyor (water district; city; water association) to complete and then returned with this application. At the top of the form, a space is provided for a description of the site. In this space, the legal description of the site should be inserted or attached on a separate sheet if it is too lengthy. For sites located in the Urban Growth Area, if the development is not proposing to be served by an existing or new Group A water system at the time of construction, a Certificate of Future Connection must be given to the appropriate Group A water purveyor to complete and then retumed with this application. Certificate of Sewer Availability/Septic Availability: Submit three (3) copies. For sites located within the Urban Growth Area: The Certificate of Sewer Availability form concerning sewer availability to the site must be given to the appropriate agency (sewer district, city) to complete and then returned with this application. At the top of the form, a space is provided for a description of the site. In this space, the legal description of the site should be inserted or attached on a separate sheet if it is too lengthy. For sites located outside the Urban Growth Area: Preliminary approval for individual or community on-site sewage disposal systems from the Seattle-King County Department of Public Health must be submitted with this application. Preliminarv Plat: Submit thirty-five (35) prints of the proposed plat prepared by a licensed land surveyor (RCW 18.43). In addition, submit one plat map reduced to fit on an 8Y:!" x 14" sheet. All prints shall be folded so they will fit into a legal file folder with the name of the subdivision visible. The information on the plat checklist must be shown on the face of the preliminary plat. Fire District Receipt: Obtain from the fire district. Submit three (3) copies. Level-One Drainage Analysis: Submit eight (8) copies. J 1 ~ Transportation Certificate of Concurrency: Submit three (3) copies. \t.l~"r:t .. 20-Ubdivision Density and Dimensions Worksheet: Submit three (3) copies. , 13. Certificate/Affidavit of Critical Areas Compliance: Submit three (3) copies. 14. Applicant Status Form: Submit three (3) copies. Variance decisions required per Kinq County Code 21A. if applicable: Submit three (3) copies. ermits or decisions related to the ro osal: Submit three (3) copies. 17. Prellmlnarv Aoollcatlon Fees Consult the current fee schedule or discuss with DOES staff for the appropriate fees to be paid at the time of application. PreHmSubd iv Appl nslructi 0 ns. doc Ic-ins-psubap.pdf 12/05/2005 Page 4 of 6 Title Report: Submit three (3) copies of a Title Report issued within 30 days of application, showing all persons having an ownership interest, a legal description describing exterior boundary of application site and listing all encumbrances affecting the site. Field Topographic Base Map: Submit eight (8) copies of field topographic base map. Conceptual Drainage Plan: Submit eight (8) copies of a conceptual drainage plan prepared by a professional engineer licensed in the State of Washington. This plan must show the location and type of the existing and proposed flow control facilities existing and proposed water quality facilities and existing and proposed conveyance systems (2.2.1 1998 SWDM). Additional Information: Any additional information, such as sketches, engineering reports, petitions, photographs, etc., that may clarify or explain the proposal or will assist in assessing the potential impact may be submitted with the application. The Land Use Services Division or the Hearing Examiner may at any time request additional information or studies for these purposes. Provide eight (8) copies of any additional information. The following must be shown on the plat: 1. Name of proposed subdivision with a limit of 32 letters and spaces. 2. Name, address, phone number, signature, and seal of registered land surveyor and registered engineer. 3. Name, address, and phone number of developer. 4. Name, address, and phone number of owner. 5. Section, Township, Range of subdivision. 6. Acreage of subdivision. 7. Number of lots, units, and proposed density. 8. Existing zone classification. 9. Proposed use (i.e., townhouse, single-family detached). 10. Means of sewage disposal; if sewer district, include name. 11. Source of water, if water district, include name. 12. School district. 13. Fire district. 14. Telephone service. 15. Power source. 16. Legal description -type or print. 17. Field topography and verification. 18. Vicinity map showing sufficient area and detail to clearly locate the subdivision in relation to surrounding roads, parks, rivers, and municipal boundaries with its scale. P reli m Subd ivAp p Instructions. doc lc-ins-psubap.pdf 1210512005 Page 5 of 6 Graphic representation shall show the following: 1. North arrow and scale. Recommended scale -1" to 1 00' or 1" to 50'. 2. Indicate by a heavy line the boundaries of the subdivision. 3. Use heavier line weight for streets so they will stand out from the lots and contour lines. 4. Dimension all lots and streets to the nearest foot. 5. Label all streets, existing and proposed. Identify areas of proposed dedication and purpose. 6. Verified field survey, with contour intervals of either 2 feet or 5 feet (see Surface Water Design Manual for specifics) within the boundaries of the proposal. For land inside the urban growth boundary, contour intervals shall be at 2-foot intervals when slopes are 15% or less and 5-foot intervals for slopes exceeding 15%. 7. Show all existing structures and parcels in their appropriate locations both within the proposed subdivision and within 100 feet of the boundaries of the proposed subdivision. Indicate whether or not the on-site structures will be removed or relocated. 8. Number lots consecutively from 1 to the total number of lots. 9. Locate and show all critical areas and hydrologic features within 500 feet of the boundaries. Indicate if streams are intermittent and the limits of any wetlands. Estimate the limits of the 25- year floodplain for streams and 1 OO-year floodplain for rivers. Provide names of all water features and all drainage basins served by or containing these features. A critical area includes erosion hazards, landslide hazards, steep-slope hazards, avalanche, flood plain, wetland, aquatic area, wildlife habitat conservation area, wildlife habitat network, and/or critical aquifer recharge areas. 10. Designate any qualifying critical area per K.C.C. 21A.24 as a tract and include appropriate buffers and BSBLS. 11. If tracts are to be set aside for nonresidential uses or reserved for future development, label such tracts and indicate their proposed use. 12. If electrical transmission lines cross the subject property, show locations of poles and towers. Place all regional utility lines crossing the site in tract(s). 13. Provide adjacent existing zoning. 14. Identify substantial grading required outside of proposed or existing right-of-way. 15. Show site distance for entry to all county roads. 16. Show existing and proposed sewers, water mains, culverts, or other underground facilities within tract. 17. Show location, widths and names of all existing, adjoining, or prior platted streets or other public ways, railroad and utility rights-of-way, parks, and other public open spaces. 18. Show any existing easements on the subject property. Provide title documents for existing easements along with descriptive recording instruments. 19. Show location of all physical and legal description encroachments affecting the boundary between the application site and the adjoining parcels. Encroachments may be from the application site onto the adjoining parcels or from the adjoining parcels onto the application site. Check out the DDES Web site at www.metrokc.qovlddes Prel imSubd ivAppl nstructions. d oc Ic-ins-psubap.pdf 12/05/2005 Page 6 or6 ® King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 206-296-6600 TTY 206-296-7217 Web date: 09/09/2005 CERTIFICATION & TRANSFER OF APPLICANT STATUS, ;:. For alternate formats. call 206-296-6600. Permit Number: LDtoPOOO I FOR CURRENT OWNER: I, Ke .. -th OIJD A IJJ In't" , (print name) hereby certify that I am an/the owner of the property which is the su ject of this application for permit or approval. If I am not the sale owner of the property, I certify that I am authorized by any and all other owners of the property to make this certification and transfer any an all rights l!we have to apply for this permit or approval to the person listed below. I, therefore certify that 1<13-.5:t::a=-L I.e. (print name) is the "applicant" for this permit or approval and shall remain the "applicant" for the duration of this permit or approval unless "applicant" status is transferred in writing on a form provided by this department. By being the "applicant," that individual assumes financial responsibility for all fees and will receive any refunds paid. I, c/~ under ~enalty of perjury ~jer the laws of the State o~ Washington that the foregoing is true and correct. ~d~ ~;f/~/Jl~7"-/ I-/lo~ Signature of Owner Date Signed FOR INDIVIDUALS: I, , (print name) hereby certify that I am the "applicant" for this permit or approval. I shall remain the "applicant" for the duration of this permit or approval unless "applicant" status is transferred in writing on a form provided by this department. I accept financial responsibility for all fees associated with this permit or approval and will receive any refunds. My mailing address is: I certify under penalty of perjury under the laws of the State of Washington that the foregoing is true and correct. Signature of Applicant OR FOR CORPORATIONS/BUSINESS ASSOCIATIONS: Date Signed I, l(olffi 0.m':J'-:(),( , (print name) hereby certify that I am an authorized agent of KB-S JI[."::. UJ:'_ , a corporation or other business association authorized in the State of Washington and that this business association is the "applicant" for this permit or approval and is financially responsible for all fees and will receive any refunds paid, This association shall remain the "applicant" for the duration of this permit or approval unless "applicant" status is transferred in writing on a form provided by this department. The mailing address of this business association is: /2 3.lD Alt: ~ sr 5 ui =:\e.. 100 u, under the laws of the State of Washington that the foregoing is true and correct. Ic-cer-trapstat.pdf / -/:< -0 ':f MA.IN FIL.' _ Date Signed. t:: COP\, 09/09/2005 ~~ i;;~ '~~2 :006 i!~g) K r. DD'-n .v. . .t:.~. NOTICE TO APPLICANTS: By law, this department returns all engineering and other plans to the applicant. If, however, you wish to authorize the department to return engineering and other plans directly to the engineer, architect, or other consultant for the limited purpose of making corrections, please designate below: ~thorize this department to return plans directly to my consultant(s) for the limited purpose of making corrections, as designated on this form. CONSULTANTS: Check out the DOES Web site at www.metrokc.qovlddes CertAndTransferApplicantStatusFORM.doc le-ceT -trapstat.pdf 09/09/2005 Page2of2 1 2-2,:05 08:31AM FROM-DaY!, Real E,tate Group --... -.. --~ ~"'III I ar~ , ® 1(1"11 o,uorty Ci.l~:rtnm~pr of UG\lgr"pntiI:Jl'U ond e.,vl(l,mmnmat $'OrvlOQtI ",Ca:,1 O:\lte~dI1J~ J\'lfIOI"lUIt amtl;flwq" n.lflnlgn. Wa.$tlbtf..l1nn gbU6b-'I.2'I5I .:!(]1"!-~1I5500 , rY :;II:us·-=ea-7'ill1· m226S227 ;:!53B T-52S P.004/005 F-S02 ib>lb p-" Certific;ation & Transfer of Applicant Status Altornafi'/e tnrmats ",,,,,,ll:ooLJI,, LIpan roques! -------·--~-----Pc-,"'-Il-N-Ul\~'b-e'-: "1--::;:c-:(;~P~O~O=-O-:::::.:;_~:=~_ E'9R ""RB!ljNT .~1l!§R: t ~l'" /J'i{ "'~-'l+ JI'~ . _ . {prjn~ nhmF'l) B"' .... Ly cliilfd1y mat j ~rr) onllhe CV.V\Pf' of'tl'UIf I "'Jpefty wn1ot'i .~ th¢(t3uh,J~'.1"(i1jr II~ ~pprl<:a1kJn 1Cl( ocrm[t or Of)provi'll tI I Q"fTI no! (l'.e 50lP ouvnf:t 01 the praFlefty. I cfu(ify lh21t , art' ::;n,.i~l1oI'fHd b)' 7.lny i"''-,1 ,.,Ir ctne.r ovvnoro or tho prQIOIQr~y 10 m.)llf":.,. "U~ t;II!I IInC'~don l\ f'ld ~r~nsfel' al"ly sn ell (1.l:J1·",,,, Il\rvfll h.~\le fa .:l1laly ror lhi6 ':"~"jnil ~,r QJPprcw:il1 to rho pcro.gn lie-ted below I, /hllrsf",o c.rli/v (1121 __ ~/i!1 A 14I"L.,~_ . __ _ (Pr.,;t n,moO) Is t1," '"appJlGDnt" fQr thi50 fltiilrm1t 01" iipprOU;\1 ~hCl .shall Mmain !he -:IIIppllO:ilnl"10f tne .((uroUOr"l of th~ r."~II·l'nH Or ~ppl","\I.r unl~a "apJ)!Jcenl" Ilt ... hrs J!l trens.rCir~ In wr1(lng ran 1I/01'UI pfI:;Ividlid bY thiS c;;II!:ICElltrnent, Oy bema U1i:! ""\pp(lo_,,tl " [!'Ial InelYrdLP~r ,,",'S'SUfTlQC 1Ltlp.,Q.S:ffll rCt§pg'~"'!R'm" t9r.aU ~ ~n~ ....n'1I r~c~iYl!!!lltn" ,eprlo/fluS p;p;IQ. I Clll'tC~ unde( (l'~l'"'L03lty 0' tlb~~Ury ul"\dar ~htt ',:IcW~ of ~o St.Qtr::t ct W~~"ingk:lll \I)~L ~Illi;t rOnigolnQ ttl !rUQ £Ind cQrree~. j6.. ft1A.h.... fL.! hJ f.::l-'M::( ~_,, ____ .?S.....-=-~.~. 2.;7., 0 ~- SIQI"IStI.U"eC¥ nuu.t~"f OQlQ Eigntld ,.--.--.--.. ,-,.~."-~,,~-,-,-.,, ._---.----- ,., ... _ .... ,,-.-.--""'~.---,---. , .. , --- . -~~-.-, .• -------.., ----.-,1'111' ", .-......... m:,-1 ~-....• S ~O -.J ) c= ,,_ .--f~ " I ' ~~ JAN 1 2 2G06 ' K.C. D.D.E.S. .-'12-23-05 08:31AM FROM-Davi, Real Estate Group 4Z5ZZ69ZZ7 T-5Z9 P.005/005 NOTICE TO APPLICANTS: By law. this deparlm .. ~t r"lelrnS all engineenng and other plans to the applicant. If. however, yo" wisll to authoflze Ihe department to return englneenng and other plans directly to the engineer, architect, or Oliler consull~~1 for tile limited Durposs of maklna corrections. pl"ase designate belOW: j:"6\ [Y.J 'I a(Jthorlz!:' this departmEnt to return plans directly to my cOl1suliant(s) for the limited purpOSe oi malting corrections, as designated on thIS form. CONSULTANTS: H02 -~,-.. -" ... -.. -, ,--- , ' .. '-_ .......... __ .,-_._ .... ,---- -_ .. _, .... __ . --, ..... _. __ .... ' ... ,_ ..... ' ............ _,---"'---"._-,. .... __ .. _--.. -.. _-" .... __ .. " ..... _ ... _ .. _._ .. _. ' .. -,,-,' ... " .. --_. "" .. _ .. "-_ ... _, ... _ .......... ' ... __ .. , , ... __ .. -. _ .. _ .. _ .. ,,--_ .. _ .. --_ .... _-,-,_.-.. _ .... ' ........ _" ...... ,--- ....... __ .... _-_ .... ,,-,-_ .. _-,_._----.. _--"' .. _,,, ,--_ .... -.. _------,--".,- --,_.-_._-"'-''' ... ' ..... _ ...... , .... _.-.. -. _.,. "-_ ... _---, ... ' .. -_ .. ,-'_ .... ,---- -------_._ ... _ .. " ..... , .. --"" .......... _ .... ------_._--_._ .. _ .. ,-'-'--.. " _ ......... ,,--_ ..... "_ ........ _-----_._--_ .. "',-"' .... ,,.-- _ .... _,-,,, ... ---.. __ ........ _..... ..-...... _----_ .. __ .. ,_ .... __ ........... __ ... " .. __ .. --- Check am the DDES Web site at www.melrokc.qovtddes a5'~O,'OJ page ~ 01 2 LEGAL DESCRIPTIONS Parcel No. 14575-0135 (Nguyen) Tract 3, Block 4, Cedar Park 5-acre tracts, according to the plat thereof recorded in Volume 15 of Plats, page 91, Records of King County, Washington. Situate in King County, Washington. Parcel No. 145750-0140 (Miya) Tract 4, Block 4, Cedar Park 5-acre tracts according to the plat thereof recorded in Volume 15 of Plats, page 91, Records of King County, Washington. TOGETHER WITH that portion of the East 30 feet of the South 658.23 feet of the North 687.48 feet of the Southeast quarter of Section 14, Township 23 North, Range 5 East, W.M., as vacated by King County Ordinance No. 4406 recorded under Recording No. 7908150748 adjoining said premises. Project Name: Miya Property January 6, 2006 SLB/ath 117781.001.doc /oJ I?!~ I c; " \\!7 rc'@ LnJ c.= ',c:! 15 'i 'G 15 0 JAN 1 2 2006 LOCoPOOQI K.C. OD.E.S. !\fAIN FILE COpy ® oDEs ! This cert;r;;ate provides t lattl~ King County Depar1ment of Public Heafth and the Department of Development-and Environmental Services with information necessarllo evaluate development proposals, DEPARTMENT OF DEVELOPMENT AND ENVIRONMENTAL SERVICES 900 Oakesdale Avenue Southwest Renton, Wa 98055-1219 King County Certificate of Water Availability ------------------------------------------I Do not write in this bOX , 1 L __________ -"l~m'!'ber""'_ __ name o Building Permit ~ PreliminalY Plat or puo o Short Subdivision o R~zone or other ,,".m_ .• _" __ proposed use: 5!r'lQle Famlly Detached HOUsifJ£L::"12J,.Q!2 [gj ~ ©rn~w rnfQ1 location: l~oo ~¥~Af=.JLM.Q(..ox SI: 1402:.5lrJt~!;.J1?nrrmJ..YHL~1lQ.5...~. .jP"~u;gLf.t~}J.4 5750--0 140) JAN 1 2 2006 ltV Water purveyor information: K.C. D.D.E.S. 1. 0 a. Water will be provided by service conn0cMn (!Illy to a;l t?-<i5tmg .:I. (s:ze) water maln that is froo..tlng the site; 2_ 3_ 4_ s_ OR g b. Water se[\:ite will requite an impro'.fem-2nt to the 'I';ater svs~o:;;n of; @ a_ OR 0 b_ g d_ OR 0 b. :;; a_ or. o (1) f~t of water main to read) the site: andi8f ~ (2} TIle construction of a distribuTion Sjstefn on the s,:t<::; ~n{j/vr ~ (3) Other (cescribe); DfWe.lQQgf Ext~19n .. h:Jr.:~.~.!l)j:nt;,.J~,?~:;Jn;;f1l?~J)n:;LHvdrilnts Required. Naln wlfl need to Qe extended down 162'1J SE ll.illU.b.!J.!Y.9hJll.~L. The water system is in conformance wilh .:; Count'.' approv0J ;.'Jrlter corr;prehensive plan. The wZlter system Improvement is not in conformance ""itl, a county <lpproved water comprehensive pian and \ .. 10 require a water cornprE!h[,1SIVe plan amendmct,t. (This may cause a delay in issuance of a permit or approval). The proposed proje(( is Wittlill tile COfl-'Grate hmits Of trlC :JI:>t:<t, or t-;;;~5 been granted Boundar; Review Boilrd ap.proval for extef';Sicn of ser"ice ClItside the j;S1\ict or City", cr'5 ~\'ithii\ the County approved service area ef-a priv?te water-pUrYe'{or. Anne.xation Of Boundary Review BOerd {fiRB) approvai vllH be necessary to provide service. Water wi!! be available at the rilte Qr tlow .:md duration indicated below at no less than 20 psi measured at the nearest fire hydrant >JQQ feet from the building/property (Qr as marked on the attached map): Rate of now at Peak Demand Du,...,tion o jess than 500 gpm (approx. gpm) 0 I£:ss than 1 hour o 500 to 999 gprn 0 1 hour to 2 hOllrs g 1000 gpm or more .~ "} hc,;rs or more o flow tt:..'St of m:.·rn 0 ctr,er o cai(JJlation of gpm (Nott!: CommerCial bUilding permits wiw.:i'1 1".(IU(jE:S mU'~lfaml!y stnKhlres require flow test or calculation.) o b. Water system is not capable of prOVl(tn9 fire flow. a a_ OR b_ Water system has certificates of water right or wate, ri9i)[ claIms sufficiem to provide service. V.Jater system does J)ot currently have flecessary water rights Qr l'Iat;-;r right claims. MAIN FIll: COPy Comm~nts/condition5: peve:QpE;·r l=\!:'§'Q.';)ion RQ.cwired. tirr?n:..:e m~€:ljEiC! 'S:ltL PI.sln:::tJi,UdgD.tify requiremenlJ. Fe~ per lot: WAC @ 5125, 3/4" Meter Drop @ $'150, GFC@ $3,200. Totai F6.:~S pt.r lot'" $3,775. F~ES SUBJECT TO CHANGE WrrnOUT PRIOR NOTICE. I cErtify that the aboVe water purv;:;yor inforrnation i~. (r-.;p.. This ci2rtlfk.<lk.'[,; ::i1.Ji! be. v[l:id for ~ from date of signature. KING COUfolTY WATER DISTRICT #90 LESTER PIEL!:: p'.Q'>I.E"y!f\L FE.ES: WIIN 1 year 550.00 Agency Ilame Signatory n.1ffiE: AffiR 1 yeqr .. Ul2.m SUPERrNTENDEr-rr Titlf: <, , Sigt1JtJjre 7../22/05 Date · .~ ® King County ODES This cem. provides the Seattle King County Department of Public Health and the Department of Development and Environmental Services with information necessary to evaluate development ptoposals. DEPARTMENT OF DEVElOPMENT AND ENVIRONMENTAl SERVICES 900 Oakesdale Avenue Southwest Renton, Wa 98055-1219 King County Certificate of Water Availability ~ not write In this box number ~~~~~~",narn'J"'--_~ _~~~~~~_ o Building Permit ~ Preliminary Plat or PUD o Short Subdivision o Rezone or other· _______ _ App!icant's name: DavIs Real Estate Group, Contact Roberta Martin, Phone: 425-228-5959 Proposed use: Single Family Residence location: 13804 SE 162M Ave, Renton, WA 98059 (attach map and legal deSCription if necessary) Water purveyor information: 1. 0 a. Water will be provided by service connectloo only to an exJsting_(size) water main that Is fronting the site. 2. 3. 4. OR Ihl b. Water service will require an Improvement to the water system of: lID a. OR 0 b. !&I a. OR 0 b. IRl a. OR o (1) feet of water main to reach the site; Clnd/or fR] (2) The constructlon of a dlstrlbution system on the site; Clnd/or 00 (3) Other (desaibe): Developer Extension Agreement Required, Including; Main extension, Looping, and required eClsements. (To be defined at pre-design meeting.) The water system Is in conformance with a County approved water comprehensive plan. The water system improvement Is not in conformance v.ith a county approved water comprehensive plan and will require a water comprehensive plan amendmenl (This may cause a delay in iSSUCl[1ce of a permit or approval). The proposed project Is within the corporate limits of the district, or tias beeJ'I granted Boundary Review Board approval for extension of service outside the distrIct or dty, or Is within the County approved servi<:e area of a private water purveyor. Annexation or Boundary Review Board (BRB) approval will be necessary to provide serviCE!. Water will be available at the rate of flow and duratlon Indicated below at no less than 20 psi measured at the nearest fire hydral'lt 61 feet from the building/property (or as marked on the attadled map): Rate of flow at Peak Demand o less than 500 gpm (approx. ~~~gpm) o 500 to 999 gpm [E] 1000 gpm or more o flow test of gpm o calruJation of _~~~~-"qpm Duration o less than 1 hour o 1 hour to 2: hours IEl 2 hours or more o other _~_~_ (Note: Commercial building permits which includes multifamily structures require flow test or caIOJlation.) o b, Water system is not capable of providing fire flow, 5. IRl a. Water system has certificates of water right or water right dalms suffldent to provide service. OR o b. Water system does not currently have neces5ary water rights or water right dalms, Comments/conditions: Costs per lot: WAC@ $125, GFC @ $3,200, :%'" Meter @ $450 := $3,775 per lot FEES S!IBJECI TO CHANGE wmtOUT PRIOR NOTICE 1 certify that the -above water purveyoclnformation is true, This certification shall be valid for 1 year from date of Signature, KING COUNTY WATER DISTRICT #90 LESTER PIElE RENEWAL fEES: WI IN 1 YEAR $50.00 Agen<.y name Signatory name AFTER 1 YEAR $12S.OQ SUPERINTENDENT Title ~?:h Signature Z-\W.let AvsilJlhiliry Ccrtificalts\Watcr AvailID!liry\Davis R<':Il] B\.atc Group_o:Ioc 3/14/05 Date r ... rayor "lovember \ 6,2005 Curtis Schuster KBS Ill. LLC 12320 NE 8'1; Street. Suite 100 Bellevue. WA 9%005 CITY OF RENTON PlannillgiBuilciillgiPublicWorks Department Gregg Zimmerman P,E .• Administrator SUBJECT: SANITARY SEWER AVAILABILITY OUTSIDE CITY LIMITS PROPOSED CAVAL LA PLAT, 34-LOT, KCPID 145750-0135,0140 DeM Mr. Schuster: This letter shall serve as an attachment to the se\ver availability reqtlest signed November 16~ 2005. This availability is issued as a combination of prc\"iously approved availabilities for the Miya and Davis proposed plats. Sewer availability is hereby contingent upon this development 110t exceeding a maximum of 34-1015. However. if the County review of this plat alters items such as street widths. this application must be rc-revi"::\\'cd by the City to determine the maximum densityallo\\'ed. It is also contingent upon the plm only' l.:l"ClltiHg detached single-family lots and executing a covenant to annex against all or the lots cremed. arding this availability. please conlnct me at 42Sw430-72 12, Loc.poool SANITARY SEWER AVAILABILITY FOR SINGLE FA~[JLY RESIDENTIAL BUlLDING CITY 0J0' RENTON 10S5 S Grady Way. Renton. WA 98055 Pbone: (425) 430-7200 Fax: (425)430-7300 TO BE FILLED OUT IlY APPLICANT: Date of Request --I--'-f-"'<I-'''-'''''- Applicant" Name: /<126 ill} I d./i Phone No_ Mailing Address: 12:;2<2 4£ f3TJA:5I/1Tfh /PC) City~ &/dd2-l/{./1£--SHite 11/4= Zip Code "7'tJms-: Check one: Proposed Single Family Home Existing Single Family Home On Septic Proposed Lot Short Plat Other (Specify) LO<ationiAddress: _---'~~~-:P-::x:......::::.!"'='-~-LLC.~~"'--__'.5,...ue_.=I(..:."':uc'A1t:.J1J"'6r"'·'L__ King County Tax Account NO:"""'"...L. ..... =-t"-i;W'"'--_=~""'-o-'.u..-L...L. __ -2 THIS APPLICATION SHALL INCLUDE A COPY OF TilE PROPOSED SITFJPLOT PLAN. INFORMATION PROVIDED BY CITY: ]. 0 Sanitary Sewer Service will be provided by side sewer connection only to an existing ___ size sewer or 0 2. main located within __________________________ _ City records show a side sewer stub to lhe property 0 YON SanitaJy s~wer service will require an extension 06;prOXimatel Y ----;>~2'..~;.....!---;----- f ~I -. 1 d' h--....J.~~-~'K--.~-L:.~~'---,t:;~~:..;,~~2i.~'ir_:_ o S1ze sew r mam . ocale Wit 10 _~ - K, . './. ~ -l. > ',,' _"df,-r;z.'67'1t1/./ t!r=-~8~ UTt-~ e proposed development lies within ___________ _ applicant shall contact The District/Agency at _______ _ See attached Jetter dated ________________________ _ Payment of all applicable system development fees: (Fees are subject to change without notice) -System Development Charge: -Residential building sewer permit: -Lateco~bWi~ $ 900 $ 60 per single family residence per single family residence (ever) {' Sanitary Sewer Availability Fonn Page 2 3. 4. 5. 6. 7. 8. 9. )i o if .~ or 0 ~ or 0 ~ or 0 Reference data _____________________________ _ Applicant shall abandon the existing septic system in accordance with Seclion 1119 of the current Uniform Plumbing Code and Seclion4-6-040.J.6 of the CilY Code. Customers making a first lime connection to sanitary sewers in King County, including Renton's Sewer Service Area., are subject to a sewage lreamlCnt capacity charge. The purpose of this King County chJrge is 10 pay for building sewage Irealment capacity to serve newly connected customers. Single- family customers pay $34.05 a month (billed by King County as $204.30 every six months) ror 15 years. AI the customer's choice. this fec m<ly be paid to King County as a lump ~UI1l of $4.136,93. This fee is in addition to the morllhly charge for trealmenllhal Renlon is required 10 collect and pass to King County. The Renton punion of the \Vaslewaler Utility Rates for CUSlomers outside the city liTTlhs is J.5 times the standard rate for customers inside the city limits. (City Code section 8-5~15C) The proposed project is within the corporate limits of the City of Renlon or has been granted King County Boundary Review Board (BRB) approval for exu::nsion of service outside the City .. Annexation or ERR npproval will be nece~~ary for the provision of sanitary !>cwer service. The sewer system improvement is in confonnance with a County approved sewer comprehensive pl;m. The sewer system improvement ",ill require an amendmenl 10 the Renton Long-Range Wastewater Management Plan. The sewer system improvement will be within an existing franchise from King County nllowing the installation of facilities in the County Right(s)·ofWay. The sewer system improvement will require that Renton obtain a franchise from King County (0 install the facilities in the County Right(s)-ofWay. CONDmONS OF CERTIFlCA T10N: 1) It is the responsibility of the owner/developer to verify. by an engineering study. whether it is possible to connect by gravity line to the existing City sewer system (a private lift statiOll may be installed, but is not desirable). The City may require, at it's option, the verification to be in the form of a leller signed by a professional civil engineer. 2) When new sanitary sewer lines are installed. the City lypically installs or requires to have ins.aJled stub-outs to the propcny line. This is done as a courtesy 10 the property owners. The City docs not guarantee a stub for all properties nor does it guarantee the condition or location of the stub. s It is the responsibility of the owner/contractor 10 have an approved connection from the building sewer to the City's sewer main. If there is a stub. it is in good condition, and the owner/contraclor can locate it. then 11 is available for use. The detennin31ion of condition of e;usting sanitary sewer stubs shall be the sole responsibility or the City and the City's decision shall be final. If the srub is broken or the City inspector delennines that the stub's condition is not acceptable, it !ihall be the owner/conrractor's responsibility to repair the stub. replace the stub at the existing tee, or to install a new stub and tee directly into the main. The method of repair/replacement to be determined by the City's inspector. Sign;uory Name Waslewatcr Utility Section dc/pwssavaIl.doc RenlonJK:[ pwssavail 1z,,)4 bh F*~ ~ei.a~:~.~ of Developluent ~ and Envirorunental Services ~)Uo Uakesnaii' A\'{'[lu{' Renton, \VA 98055-1218 Fire District Receipt J.5 Fire District It Name of Project / Proposal ~-,C,--~A:uVLla"-,-II~a,,\\ __ ---,=,3,--4L-'I ... of"'-L--,,,S-"(,("'B,,,,j),,,,-,i v'-!t''''sl.'ian''-'-l,.-__________ _ Location of Project / Proposal ~--LJ--=(,"';2:::w=..Ji.D_____JAD.J<ve.""--"SLe'------t-----'M--'-'-~'P/ZA:iX="----___ 5J.)J-e:::"'_____JI'---1./~6_f1.----"S<-+_I__----- (Address, parcel number, tax account number, legal description), 'One of these required for processing of application SEC I L{ TWN _--=k,,-,3~___ RNG. 5'(;( KROLL PAGE ____ _ Name of Applicant _--=K--=-=B~5'----,JCC'_"'"""~""'L.=/=C=---""-(--'C-=..l<!B...LS----"l)a;=-'--"--'.'---0J-=--'='=~'l_f-=-.)+-------- Address of Applicant /23;):0 Nt;;. 1?t'-Sf-Su(~ }OO l"ReLlevlA.... tJ+-'i~ Telephone Number 2t>{, -&z 3 -')060 CCu4.liS scL.sJe-.-) f;~ tt..-~~ ~ . Description: Type of Project I Proposal ""1, I IJC.. 'fa; -~ -7 'iDs' Check appropriate box(es) o Apartment / Multifamily o Duplex 0 Conditional Use o Commercial/Industrial ~sion n Unconditional Use o Retail o Short Subdivision / Short Plat 0 Planned Unit Development [J Residential: Single Family Residence o Rezone 0 School/Classroom o Other (describe) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~_ o Storz couplings required on Fire Hydrants Issuance of this receipt does not imply an approval, disapproval nor review of referenced project / proposal. This re~.ei t. shall be valid for 30 days from. date of signature. G <~ /J I I ~ 'l}L & .-i-0.&~st--rU d 4 d5' ~,,+-:-U=,,· . -.-L-----'JF'-+-_~-=----~_~ Age~ame. ry Name r Jk!~ 4S$('b~ , V O/-o9-o&' Title Date Distribution: White: Applicant (see below) Yellow: King County Building Services Division Pink: Fire District Note Applicant: at the time of application to DDES the white copy must be presented with project I proposal submittal. 0178 {Re ... 9/971 Fire District: mail yellow copy to: King County Building Services Division 900 Oakesdale Avenue Renton, WA 98055-121~~ :',' . '.~:.: '. :"'~' i.'-~ 0-":",,,,'1 "f' Attn: Fire Engineering--., " , :) U JAN 1 2 2GOS ',. K ,-.. DO---(' .0. . .t:-.. ":J. LOloPoOC} King County Department of Development and Environmental Services Land Use Services Division Web date: 09/13/2005 900 Oakesdale Avenue Southwest Renton, Washing10n 98055-1219 206-296-6600 nY 206-296-7217 For alternate formats. call 206-296-6600. STATE OF WASHINGTON ) ) SS COUNTY OF KING ) KeD """'" . . ·.U.:.': File Number: L 0 f.t, POOO , Application Name: C A 1/ A u...A --~~~~---------------------------------- Project Location: The undersigned, being first duly sworn on oath deposes and says: 1. That the affiant is competent to be a witness herein; 2. That the affiant is the applicant for the above project; 3. That to the best of the affiant's knowledge the critical areas on the development proposal site have not been illegally altered; and 4. That the affiant has not previously been found to be in violation of critical areas regulations for any property in King County, or alternatively, that if there have been any violations, such violations have been/are being cure to the satisfaction of King County. bate and Place (City and Stale) I certify under penalty of perjury under the laws of the State of Washington that the foregoing is true and correct. MAIN FILE COpy Check out the DOES Web site at www.metrokc.qovlddes AffidavitcriticalAreasComplianceFORM.doc Ic-aff-sacomp.pdf 09/13/2005 \ King County Road Services Division Department ofTransportution 201 South Jackson Street Seattle, 'NA 98104-3856 TYPE OF CERTIFICATE [8J ORIGINAL D CONDITIONAL March 8, 2005 Certificate # 01718 File Number: 05-03-02-02 Expires: March 8, 2006 CERTIFICATE OF TRANSPORTATION CONCURRENCY D Specific conditions are described on the reverse side ofthi5 certificate. Pursuant to King County Code, Chapter 14.70 as amended, this certifi.cate confinns that the level of service standard used in the Transportation Concurrency Management program has been satisfied. IMPORTANT: This certificate does not guarantee a development pennit. Other transportation improvements and mitigation will be required to comply with Intersection Standards, Mitigation Payment System, King County road standards, and/or safety needs. 1. Applicant Name and Address: Curtis Schuster, KBS III LLC 12320 NE 8th Suite 100, Bellevue, WA 98005 2. Property Location: a. Property Address: 162nd Ave. SE & SE 140th SI. b. Development Name: Miya Property c. Parcel Number: 1457500140 3. Typc of Development Permit To Be Requested: Format Plat 4. Proposed Land Usc: Single Family Residential 5. Zone Location and Reserved Units: a. Concurrency Zone: 763 Community Planning Area: Newcastle I. Commercial Project -Total Square Feet: 0 ii. Multi-family -Number of Units: 0 iii. Single family -Number of Units: 19 6. This Certificate is subject to the following general conditions: a. This Certificate of Concurrency runs with the land and is transferable only to subsequent owners of the same property for the stated development, subject to the terms, conditions and expiration date listed herein. This Certificate of Concurrency is not transferable to any other property and has no commercial value. This Certificate Expires: March 8, 2006 unless you apply for the development permit described above, prior to that date. If this requirement is not met the King County Department of Transportation reserves the option to cancel your certificate and capacity reservation. When you apply for a development permit with King County's Department of Development and Environmental Services (DDES), bring this Certificate of Transportation Concurrency as part of lite development application package. If you have any questions, please call (206) 263-4759. ,./,.... D n ~ S i'"\ . ~ ..... < • U . C. . . LexoPOOO} .--------® King County Road Services Division Department of Transportation 201 South Jackson Street Seattle, \VA 98104-3856 TYPE OF CERTIFICATE [ZJ ORIGINAL D CONDITIONAL / December 16, 2005 Certificate # 01883 File Number: 05-12-16-01 Expires: December 16, 2006 CERTIFICATE OF TRANSPORTATION CONCURRENCY D Specific conditions are described on the reverse side of this certificate. Pursuant to King County Code, Chapter 14.70 as amended, this certificate confirms that the level of service standard used in the Transportation Concurrency Management program has been satisfied. IMPORTANT: This certificate does not guarantee a development permit. Other transportation improvements and mitigation will be required to comply with Intersection Standards, Mitigation Payment System, King County road standards, and/or safety needs. 1. Applicant Name and Address: Mike Davis, Davis Real Estate 27013 Pacific Highway S. Pmb 363, Des Moines, WA 98198 2. Property Location: a. Property Address: 13804 SE 162nd Ave. b. Development Name: c. Parcel Number: 1457500135 3. Type of Development Permit To Be Requested: Formal Plat 4. Proposed Land Use: Single Family Residential 5. Zone Location and Reserved Units: a. Concurrency Zone: 763 Community Planning Area: Newcastle i. Commercial Project -Total Square Feet: 0 ii. Multi-family -Number of Units: 0 111. Single family -Number of Units: 24 6. This Certificate is subject to the following general conditions: a. This Certificate of Concurrency runs with the land and is transferable only to subsequent owners of the same property for the stated development, subject to the terms, conditions and expiration date listed herein. This Certificate of Concurrency is not transferable to any other property and has no commercial value. This Certificate Expires: December 16, 2006 unless you apply for the development pennit described above, prior to that date, If this requirement is not met the King County Department of Transportation reserves thc option to cancel your certificate and capacity reservation_ When you apply for a development permit with King County's Department of Development and Environmental Services (DDES), bring this Certificate of Transportation Concurrency as part of the de,,'eiopment application package. [fyou have any questions, please call (206) 263-4759. ~/~=-c Linda Dougherty, Director, Road serViC:: -. -. II [J y,~, I:~ J n ) Department of Transportation 11 -', ...J./ King County, Washington U L.l JAN 1 2 2006 K.C. D.D.E.S. LotoPQC)OI W Web date: 1112812007 King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, WA 98057-5212 SUBDIVISION DENSITY & DIMENSION CALCULATIONS 206-296-6600 TIY 206-296-7217 For alternate formats, call 206-296-6600. File Number (To be filled in by DOES) PRELIMINARY SUBDIVISION WORKSHEET RELATING TO DENSITY AND DIMENSIONS Several development regulations playa role in the creation of a subdivision within King County. Determining the allowable density, minimum density, and a lot width on a piece of property can be confusing. This worksheet will assist you in correctly applying specific portions of the code and will be used to determine if a proposed subdivision or short subdivision meets the density and dimensions provisions of the King County Zoning Code (Title 21A). This worksheet is designed to assist applicants and does not replace compliance with adopted local, state and federal laws. Pre-application conferences are required prior to submittal of a subdivision or short subdivision. These conferences help to clarify issues and answer questions. They may save you both time and money by eliminating delays resulting from requests for additional information and revisions. You may call 206-296-6600 to find out how to arrange for a pre-application conference. Worksheet Prepared By: G. Wayne Potter Date: 7-29-08 ~~~~~~~~~~n~nt~N~a-m-e~)-------------- Subdivision Name: _C~a=v=a=l=l.=a,--__________________________________________________ _ Comprehensive Plan Land Use Designation: Urban Residential 4-12 DUlAC Zoning: --"R,--~4,--______________ _ If more than one Comprehensive Plan Land Use designation or zone classification exists for the property, show the boundary between the land uses or zones and the area within each on the preliminary plat map. If a single lot is divided by a zone boundary, transferring density across zones on that lot may be permitted subject to the provisions of K.C.C. 21A.12.200. PLEASE COMPLETE ONLY THE APPLICABLE PORTIONS OF THIS FORM I. Site Area (K.C.C. 21A.OS.1172) also see (K.C.C. 21A.12.080): Site area (in square feet) is the TOTAL horizontal area of the project site. SubdivDensityDimensionCalcFORM.doc lc-cal-5ubden,pdf 11/28/2007 Page 1 of6 Calculation: 409 , 460 Gross horizontal area of the project site _4-,0_9--",--4_6_0 ___ Site area in square feet NOTE: To continue calculations, convert site area in square feet to acres by dividing by 43,560 9.40 Site area in acres ------- NOTE: When calculating the site area for parcels in the RA Zone, if the site area should result in a fraction of an acre, the following shall apply: Fractions of .50 or above shall be rounded up to the next whole number and fractions below .50 shall be rounded down. Example: If the site area in acres is 19.5 acres (less the submerged land and less the area that is required to be dedicated on the perimeter of a project site for public right-of-way) the site area can be rounded up to 20 acres. No further rounding is allowed. (See K.C.C. 21A.12.0BO) II. Base Density (K.C.C, 21A.12.030 -.040 tables): The base density is determined by the zone designations(s) for the lot. 4 du/acre III. Allowable Dwelling Units and Rounding (K.C.C. 21A,12,070): The base number of dwelling units is calculated by multiplying the site area by the base density in dwelling units per acre (from K.C.C. 21 A.12.030 -.040 tables), 9.40 site area in acres (see Section 1.) X _...::4'---____ base density (see Section II) = 38 allowable dwelling units Except as noted below, when calculations result in a fraction, the fraction is rounded to the nearest whole number as follows: A. Fractions of .50 or above shall be rounded up; and B. Fractions below .50 shall be rounded down. NOTE: For parcels in the RA Zone, no rounding is allowed when calculating the allowable number of dwelling units. For example, if the calculation of the number of dwelling units equaled 2.75, the result would be 2 dwelling units. Rounding up to 3 is not allowed. (See K.C.C. 21A.12.070(E).) IV, Required On-site Recreation Space (K.C.C. 21A.14.180): This section must be completed only if the proposal is a residential development if more than four dwelling units in the UR and R zones, stand-alone townhouses in the NB zone on property designated Commercial Outside of Center if more than four units, or any mixed use development if more than four units. Recreation space must be computed by multiplying the recreation space requirement per unit type by the proposed number of such dwelling units (K.C.C. 21A.14.1BO). Note: King County has the discretion to accept a fee in lieu of all or a portion of the required recreation space per K.C.C. 21A.14.185. Apartments and town houses developed at a density greater than eight units per acre, and mixed use must provide recreational space as follows: 90 square feet X 170 square feet X 170 square feet X _____ proposed number of studio and one bedroom units _____ proposed number of two bedroom units _____ proposed number of three or more bedroom units Recreation space requirement SubdivDensityDimensianCalcFORM.doc Ic-cai-subden,pdf 11/28/2007 + + = Page 2 of6 Required On-site Recreation Space Continued Residential subdivisions, townhouses and apartments developed at a density of eight units or less per acre must provide recreational space as follows: 390 square feet X _3=3 ____ proposed number of units = 12,870 Mobile home parks shall provide recreational space as follows: 260 square feet X ______ proposed number of units = V, Net Buildable Area (K,C.C. 21A.06.797): This section is used for computing minimum density and must be completed only if the site is located in the R-4 through R-48 zones and designated Urban by the King County Comprehensive Plan. The net buildable area is the site area (see Section I) less the following areas: + + + a areas within a project site which are required to be dedicated for public rights-of-way in excess of sixty (60') of width o critical areas and their buffers, to the extent they are required by King County to remain undeveloped 44 , 504 areas required for above ground stormwater control facilities including, but not limited to, retention/detention ponds, biofiltration swales and setbacks from such ponds and swales 12 , 870 areas required by King County to be dedicated or reserved as on-site recreation areas. Deduct area within stormwater control facility if requesting recreation space credit as allowed by K.C.C 21A.14.180 (see Section IV) + ° regional utility corridors, and + _____ other areas, excluding setbacks, required by King County to remain undeveloped = 57, 374 Total reductions Calculation: ---=4",0",9-<.,,,,,4,,,6,,,0,--_ site area in square feet (see Section 1 ) = = _5_7--,-, _3_7_4 __ Total reductions _3i:5:>.2L.,.-.i10..cRc.t6L-_ Net buildable area in square feet NOTE: convert site area is square feet to acres by dividing by 43,560 --'8::....:... . .:.0.::.8 ___ Net buildable area in acres VI. Minimum Urban Residential Density (K.C.C. 21A.12.060): The minimum density requirement applies only to the R-4 through R-48 zones. Minimum density is determined by multiplying the base density in dwelling units per acre (see Section II) by the net buildable area of the site in acres (see Section V) and then multiplying the resulting product by the minimum density percentage from the K.C.C. 21A.12.030 table. The minimum density requirements may be phased or waived by King County in certain cases. (See K.C.C. 21A.12.060.) Also, the minimum density requirement does not apply to properties zoned R-410cated within the rural town of Fall City. (See K.C.C. 21A.12.030(6)12.) Calculation: 4 base density in dulac (see Section II) X 8 . 08 Net buildable area in acres (see Section V) = 32 X minimum density % setforth in K.C.C. 21A.12.030 or as adjusted in Section VII (85%) = 27 2 minimum dwelling units required SubdivDensityDimensionCalcFORM.doc Ic-cal-subden.pdf 11/28/2007 Page 3 of6 VII. Minimum Density Adjustments for Moderate Slopes (K.C.C. 21A.12.087): Residential developments in the R-4, R-6 and R-8 zones may modify the minimum density factor in K.C.C. 21A.12.030 based on the weighted average slope of the net buildable area of the site (see Section V). To determine the weighted average slope, a topographic survey is required to calculate the net buildable area(s) within each of the following slope increments and then multiplying the number of square feet in each slope increment by the median slope value of each slope increment as follows: sq. ft 0-5% slope increment X 2.5% median slope value = + sq. ft 5-10% slope increment X 7.5% median slope value = + + sq. ft 10-15% slope increment X 12.5% median slope value = + + sq. ft 15-20% slope increment X 17.5% median slope value = + + sq. ft 20-25% slope increment X 22.5% median slope value = + + sq. ft 25-30% slope increment X 27.5% median slope value = + + sq. It 30-35% slope increment X 32.5% median slope value = + + sq. It 35-40% slope increment X 37.5% median slope value = + Total square feet Total square feet in net buildable area adjusted for slope Calculation: _____ total square feet adjusted for slope divided by total square feet in net buildable area = _____ weighted average slope of net buildable area = _____ % (Note: multiply by 100 to convert to percent -round up to nearest whole percent) Use the table below to determine the minimum density factor. This density is substituted for the minimum density factor in K.C.C. 21A.12.030 table when calculating the minimum density as shown in Section VI of this worksheet. Weighted Average Slope of Net Minimum Density Factor Buildable Area(s) of Site: 0% --less than 5% 85% 5% --less than 15% 83%, less 1.5% each 1 % of average slope in excess of 5% 15% --less than 40% 66%, less 2.0% for each 1 % of average slope in excess of 15% EXAMPLE CALCULATION FOR MINIMUM DENSITY ADJUSTMENTS FOR MODERATE SLOPES: --CC~:-:--sq. ft 0-5% slope increment X 2.5% median slope value = _--:-:~'-:-_ sq. ft 5-10% slope increment X 7.5% median slope value = _-===-_ sq. It 10-15% slope increment X 12.5% median slope value = _____ sq. ft 15-20% slope increment X 17.5% median slope value = ____ sq. ft 20-25% slope increment X 22.5% median slope value = _____ sq. ft 25-30% slope increment X 27.5% median slope value = _____ sq. ft 30-35% slope increment X 32.5% median slope value = _____ sq. ft. 35-40% slope increment X 37.5 % median slope value = __ --::-'7:'.:5":'0_ + __ -"2""5,,,0,,,0_ + + ----- -----+ -----+ -----+ Total square feet --===--in net buildable area ----=-==-+ __ ""3""2,,,5,,,0_ Total square feet adjusted for slope 3.250 Total square feet adjusted for slope divided by 30,000 Total square feet in net buildable area .108333 Weighted average slope of net buildable area = ___ -'-1.:.1 '",V,,--(Note: multiply by 1 00 to convert to percent -round up to nearest whole percent) Using the table above, an 11 % weighted average slope of net buildable area falls within the 5% --less than 15% range which has a minimum density factor of 83%, less 1.5% for each 1 % of average slope in excess of 5%. Since 11 % is 6% above 5%, multiply 6 times 1.5 which would equal 9%. Subtract 9% from 83% for an adjusted minimum density factor of 74%. This replaces the minimum density factor in K.C.C. 21 A.12.030 table. SubdivDensityDimensionCalcFORM.doc Ic-cal-subden.pdf 11/28/2007 Page4of6 · VIII. Maximum Dwelling Units Allowed (K.C.C. 21A.12.030 -.040): This section should be completed only if the proposal includes application of residential density incentives (K.C.C. 21A.34) or transfer of density rights (K.C.C. 21A.37). Maximum density is calculated by adding the bonus or transfer units authorized to the base units calculated in Section III of this worksheet. The maximum density permitted through residential density incentives is 150 percent of the base density (see Section II) of the underlying zoning of the development or 200 percent of the base density for proposals with 100 percent affordable units. The maximum density permitted through transfer of density rights is 150 percent of the base density (see Section II) of the underlying zoning of the development. base density in dwelling units per acre see (Section II) X 150% = maximum density maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density incentives (K.C.C. 21A.34) base density in dwelling units per acre (see Section II) X 200% = maximum density maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density incentives with 100 percent affordable units (K.C.C. 21A.34) _____ base density in dwelling units per acre (see Section II) X 150% = maximum density _---: __ .,--maximum density in dwelling units per acre X site area in acres = maximum dwelling units allowed utilizing density transfers (K.C.C. 21A.37) Calculation: + + base allowable dwelling units calculated in Section III bonus units authorized by K.C.C. 21A.34 ______ transfer units authorized by K,C,C. 21A.37 ______ total dwelling units (cannot exceed maximum calculated above) IX. Minimum Lot Area For Construction (K.C.C. 21A.12.100): Except as provided for nonconformances in K.C.C. 21A.32: A, In the UR and R zones, no construction shall be permitted on a lot that contains an area of less than 2,500 square feet or that does not comply with the applicable minimum lot width, except for townhouse developments, zero-lot-line subdivisions, or lots created prior to February 2, 1995, in a recorded subdivision or short subdivision which complied with applicable laws, and; B. In the A, F, or RA Zones: 1, Construction shall not be permitted on a lot containing less than 5,000 square feet; and 2, Construction shall be limited to one dwelling unit and residential accessory uses for lots containing greater than 5,000 square feet, but less than 12,500 square feet. (K,C.C, 21A.12.1 00) SubdivDensityDimensionCalcFORM.doc Ic-cal·subden.pdf 1112812007 Page 5 of 6 X. Lot Width (K.C.C. 21A.12.050(B)): Lot widths shall be measured by scaling a circle of the applicable diameter within the boundaries of the lot as shown below, provided than an access easement shall not be included within the circle. (See K.C.C. 21A.12.050). 30 Feet Lot Width Circle Lot Width Measurement Check out the DDES Web site at wwwkillgcounty.gov{Qermits SubdivDensityDimensionCalcFORM.doc Ic-cal-subden.pdf 1112812007 Page 6 of 6 PRELIMINARY TECHNICAL INFORMATION REPORT Proposed Plat of Cavalla East Side of 162nd Avenue S.E. South of S.E. 137th Place King County, Washington Prepared for: KBS III, LLC 12320 N.E. 8th Street, Suite 100 Bellevue, WA 98005 December 21,2005 Our Job No. 11778 K.C. 0.D.1:.8. I"P'RES 101101/{'i2 Lo&;fooo) CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES 18215 72NOAvENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES • OLYMPIA, WA • TEMECULA, CAAj,.ri-"'t{:\I!~:,cA www.barghausen.com Nt."·· - TABLE OF CONTENTS 1.0 PROJECT OVERVIEW Figure I -Technical Information Report (TIR) Worksheet Figure 2 - Vicinity Map Figure 3 -Drainage Basins, Subbasins, and Site Characteristics Figure 4 -Soils Map 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of Core Requirements 2.2 Analysis of Special Requirement No. I 3.0 OFF-SITE ANALYSIS 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology B. Developed Site Hydrology C. Performance Standards D. Flow Control System E. Water Quality System 11778.00S.doc [lPJltep] 1.0 PROJECT OVERVIEW 1.0 PROJECT OVERVIEW The proposed plat of Cavalla is approximately a 9.4-acre site located within a portion of the Southeast quarter of Section 14, Township 23 North, Range 5 East, Willamette Meridian, King County, Washington. More specifically, the site is located on the eastern side of 162nd Avenue S.E. and 200 feet south of S.E. 137th Place and is fairly rectangular in shape. The enclosed Figure 2 -Vicinity Map, depicts the approximate location of the proposed site. The existing topography is such that it is undeveloped and consists of forested areas over the entire site. The site tends to slope at an approximately grade of 8 percent in a north to southwesterly direction. There is one existing single-family residence located in the northwest comer of the project site. This residence will be demolished with the construction of this plat. The storm drainage facility is proposed to be located in the southwest comer of the project site such that the site will discharge in the same location it does under existing conditions. There are no wetlands located on this project site and road improvements are proposed for half-street widening of l62nd Avenue S.E. This is why the flow control calculations utilized 9.9 I acres of development rather than 9.4 acres, since there are road improvements along the western property line of the site. The western boundary of the project site is formed by 162nd Avenue S.E. The plat of Liberty Lane forms the project site's northern boundary. Unplatted land, which may be a park area, forms the eastern boundary of the project site. There is a proposed development located south of the project site that will probably be developed concurrently with this project since it has been previously submitted to King County for plat approval. The proposal for this development is to subdivide the property into 34 separate lots with a separate tract for access to some of the lots, and another tract for stormwater quality and a flow control facility. In addition, road improvements will be constructed throughout the project to provide access to the project's lots. Elevations on the site range from 480 along the northern property line down to 432 along the southern property line at the southwest comer of the project site. There is an approximate 5.4-acre upstream basin contributing runoff to the northern property line of the project site. This runoff is channeled along the perimeter of the property line of the site and discharges at the northwest comer of the site near a ditch onto the road improvements proposed for this development. This ditch will be collected by a catch basin and pipe conveyance system at the northwest corner of the site and routed, in a separate system bypassing the on-site pipe conveyance system, discharging to the detention pond. This upstream basin will be routed through the road improvements and will discharge further downstream, much as it does under existing conditions, at the southwest corner of the property site. 1177S.005.doc {JPJftep] FIGURE 1 TECHNICAL INFORMATION REPORT (TIR) WORKSHEET King County Department of Development and Environmental Services TECHNICAL INFORMATION REPORT (TIR) WORKSHEET Part 1 PROJECT OWNER AND PROJECT ENGINEER Project Owner KBS III, LLC Address 12320 N.E. 8th Street, Suite 100 Bellevue, W A 98005 Phone Project Engineer Ali Sadr, P.E. Company Barghausen Consulting Engineers, Inc. Address/Phone 18215 -nnd Avenue South Kent, WA 98032/ (425) 251-6222 Part 3 TYPE OF PERMIT APPLICATION 181 Subdivision HPA D Short Subdivision 181 Grading D Commercial 0 Other Part 5 SITE COMMUNITY AND DRAINAGE BASIN Community Renton Highlands Drainage Basin Cedar River Part 6 SITE CHARACTERISTICS D River D Stream D Critical Stream Reach 0 Depressions/Swales D lake D Steep Slopes Part 2 PROJECT LOCATION AND DESCRIPTION Project Name Proposed Plat of Cavalla Location Township 23 North Range 5 East Section 14 Part 4 OTHER REVIEWS AND PERMITS D DFWHPA D Shoreline Management D COE 404 D Rockery D DOE Dam Safety D Structural Vaults D FEMA Floodplain D Other 0 COEWetiands D Floodplain D Wetlands D Seeps/Springs D High Groundwater Table o Groundwater Recharge D Other ] 177K005.doc (lPJ/tepJ Part 7 SOILS Soil Type Slopes Alderwood D Additional Sheets Attached Part 8 DEVELOPMENT LIMITATIONS REFERENCE D D D D D Additional Sheets Attached Part 9 ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION [2J Sedimentation Facilities IZI Stabilized Construction Entrance [8J Perimeter Runoff Control D Clearing and Grading Restrictions I:8J Cover Practices [g] Construction Sequence D Other Part 10 SURFACE WATER SYSTEM D Grass Lined Channel D Tank [8J Pipe System D Vault D Open Channel D Energy Dissipater [8J Dry Pond D Wetland [8J Wet Pond D Stream Erosion Potential Erosive Velocities L1MITATION/StTE CONSTRAINT [8J [8J [8J [8J D D D D D D D 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 ________________________________ ~ Infiltration Method of Analysis Depression KCRTS Flow Dispersal CompensationIMitigation Waiver of Eliminated Site Storage Regional Detention Level 2 Flow Control Brief Description of System Operation Catch basin collection to oioe conveyance to wet/detention pond then dispersed. Facility Related Site limitations Reference Facility Limitation 11778.DOS.doc [JPJ/tepJ Part 11 STRUCTURAL ANALYSIS Part 12 EASEMENTSITRACTS D Cast in Place Vault D Drainage Easement D Retaining Wall D Access Easement D Rockery > 4' High D Native Growth Protection Easement D Structural on Steep Slope 181 Tract D Other D Other Part 13 SIGNATURE OF PROFESSIONAL ENGINEER I, or a civil engineer under 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. t177S005doc [JPJ/lep] FIGURE 2 VICINITY MAP ~Ci>t44v~ f~.~ o ¥ \~. "'-.... ' VICINITY MAP NORTH SOURCE: THE THOMAS GUIDE (USED BY PERMISSION) FIGURE 3 DRAINAGE BASINS, SUBBASINS, AND SITE CHARACTERISTICS 'Ifll'\fA'\fQ tlD=l N'\fld 3O'\fNI'\ftla aN'\f 83lI=Otld aNV avOtl AtlVNI~1l3tld on<;~ -I';Hi 'M il+O. :s::wl '"IIU " gOOS6 '1M '3M3ll39 om '318 '1331::118 H1S '3 'N O~£~l 'dOOQ lN3~dOl3A3a sa)! .~8 I '000 Ii I I ~'t ~t I 'x. I , i ~ g . . ~ . i ~~~ ;;~~ •• i · , 1 ! ./. !o"I~ ... ~~_I ....... - :"!'OS I " ,-:".,,",',' l ~~~ !. ;O/lO/l1 "0.0 S3:'lL~JS ""f lNJflN(lll iN'o'J ':)~LI.l~f\S ~ '~N NIh1d Q'((1 '~'ifl!3]NI~N3 lIN;) ,'~ , Oi)!O _~G'f ; ,"~, ~o ~~ .. ",."~ '1:'1 :. lSL8 -I~Z (~Z t» : .J!. _ . ': Zll9-l liZ (SOZ I» 1. ", e ~ ,.", zr096 "IN. 'iN)! ~ .4 ""'-~Meo Klnos JnN];", ONZi S I Zg I oSIl)\rI-l~~ ~- I "'N ~--" , "n·" 'VlS 'f ~ 10 S 1IOI1:l&JIN 'I' I , I I I I '·i--+ __ i i "' 0:: <0 0 " l j 1 g ,0 G ,-~ SLLI! FIGURE 4 SOILS MAP I I l f"" " I' I I I } I" I I" r .. Py i AkF \ AkF SOILS MAP NORTH 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.0 CONDITIONS AND REQUIREMENTS SUMMARY 2.1 Analysis of Core Requirements Core Requirement No. I: Discharge at the Natural Location. Response: This project site will discharge after flow control in the water quality pond at the same location it does under existing conditions. Core Requirement No.2: Off-Site Analysis. Response: This project has prepared an off-site analysis that is located in Section 3.0 of this Preliminary Technical Information Report. Please refer to that document for the off-site analysis. Core Requirement No.3: Flow Control. Respouse: This project will provide now control in the form of a wet/detention pond located in the southwest comer of the project site discharging to the same location as it does under existing conditions. In addition, Flow Control BMPs will be applied to all lots by the developer and the contractor at the time of construction. For the initial sizing of the now control pond prepared for this development, the flow control BMPs were not included in the calculations. Therefore, a pond larger than what will actually be required was determined for this project site. This is a conservative design. Core Requirement No.4: Conveyance System. Response: The conveyance system for this project site will be sized according to the 2005 King County, Washington Surface Water Design Manual (KCSWDM). Since the project site is less than 10 acres in size, the pipe conveyance system will be sized based on the Rational method as delineated in the 1990 KCSWDM utilizing an initial time of concentration of 6.3 minutes and a Manning's "n" value of 0.014. In addition, the 25-year precipitation will be utilized, which is a requirement of the 2005 KCSWDM. The 100-year event will be analyzed for overtopping as long as it does not impact any downstream development. Core Requirement No.5: Temporary Erosion and Sediment Control. Response: This project site will follow the erosion and sediment control measures as delineated in Appendix D of the 2005 KCSWDM such that clearing limits will be specified, cover measures will be instituted, perimeter protection will be installed in the form of silt fences, a rock construction entrance will be installed, and the streets will be swept clean of sediment after construction at the end of each day. On-site sediment retention will be maintained in the form of a sediment pond. Surface water collection will be maintained by collecting runoff from the project site through temporary V -ditches and routing them to the sediment pond, sized according to Appendix D of the 2005 KCSWDM. Core Requirement No.6: Maintenance and Operations. Response: This project will concur with all maintenance and operations requirements as delineated in the 2005 KCSWDM for projects of this nature. 11778.cXI5.doc IJPJ/tep] Core Requirement No.7: Financial Guarantees and Liability. Response: This project will concur with all financial guarantees and liability requirements of the 2005 KCSWDM as delineated for projects of this nature. Core Requirement No.8: Water Quality. Response: The Water Quality Menu followed for this project site requires that the Basic Waler Quality Menu be followed for this development. One of the options of the Basic Water Qual ity Menu allows the provision of a wet pond. This project is proposing a wet pond located below the live storage in the wet/detention pond such that three times the mean annual storm will be provided as dead storage below the live storage in the wet/detention pond. 2.2 Analysis of Special Requirement No.1 Special Requirement No.1: Other Adopted Area-Specific Requirements. Response: To the best of our knowledge, the site is not located in an Other Adopted Area-Specific Requirement area; therefore, Special Requirement No. I does not apply. I 1778.005.doc [JPJ/tep] 3.0 OFF -SITE ANALYSIS LEVEL 1 OFF-SITE DRAINAGE ANALYSIS Proposed Plat of Cavalla East Side of 162nd Avenue S.E. South of S.E. 137th Place King County, Washington Prepared for: KBS III, LLC 12320 N.E. 8th Street, Suite 100 Bellevue, WA 98005 November 14, 2005 Our Job No. 11778 IEXPIRes lU/lO/Ote CIVIL ENGINEERING, LAND PLANNING, SURVEYING, ENVIRONMENTAL SERVICES 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251-8782 FAX BRANCH OFFICES • OLYMPIA, W A • TEMECULA, CA • WALNUT CREEK, CA www.barghausen.com TABLE OF CONTENTS TASK I STUDY AREA DEFINITION AND MAPS EXHIBIT A Vicinity Map EXHIBIT B Downstream Drainage Map EXHIBIT C Upstream Basin Map TASK 2 RESOURCE REVIEW EXHIBIT D FEMA Map EXHIBIT E Sensitive Areas Folios EXHIBIT F SCS Soils Map EXHIBIT G Assessor's Map EXHIBIT H Wetland Inventory Map EXHIBIT I Basin Reconnaissance Summary Report TASK 3 FIELD INSPECTION EXHIBIT J Off-Site Analysis Drainage System Table 3.1 Conveyance System Nuisance Problems (Type I) 3.2 Severe Erosion Problems (Type 2) 3.3 Severe Flooding Problems (Type 3) TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS EXHIBIT K Drainage Complaints ll77S.0m.Joe TASK! STUDY AREA DEFINITION AND MAPS TASK! STUDY AREA DEFINITION AND MAPS The proposed plat of Cavalla is approximately a 9.4-acre site located within a portion of the Southeast quarter of Section 14, Township 23 North, Range 5 East, Willamette Meridian, King County, Washington. More specifically the site is located on the eastern side of l62nd Avenue S.E. and 200 feet south of S.E. 137th Place and is fairly rectangular in shape. The enclosed Exhibit A -Vicinity Map depicts the approximate location of the proposed site. The existing topography of the site is such that it is undeveloped and consists of forested areas over the entire site. The site tends to slope at an approximate grade of 8 percent in a north-to-south westerly direction. There is one existing single-family residence located in the northwest comer of the project site. This residence will be demolished with the construction of this plat. The storm drainage facility is proposed to be located in the southwest comer of the project site such that the site will discharge in the same location it does under existing conditions. There are no wetlands located on this project site and road improvements are proposed for half-street widening of l62nd Avenue S.E. The western boundary of the project site is formed by l62nd A venue S.B. The plat of Liberty Lane forms the project site's northern boundary. Unplatted land, which may be a park area, forms the project's western boundary. There is a proposed development located south of the project site, which will probably be developed concurrently with this project site since it has been previously submitted to King County for plat approval. The proposal for this development is to subdivide the property in 34 separate lots with a separate tract for access to some of the lots and another tract for stormwater quality and flow control facilities. In addition, road improvements will be constructed throughout the project to provide access to the project site's lots. Elevations on the site range from 480 along the northern property line, down to 432 along the southern property line at the southwest comer of the project site. UPSTREAM DRAINAGE ANALYSIS Based on review of the topographic map, the site improvement plans prepared for the Liberty Lane plat located north of the project site, and our site visit it appears there is upstream flow onto and through the site. This upstream flow is all routed to the northwest comer of the property and is conveyed in a ditch along the future right-of-way of 162nd Avenue S.E., where it finally disperses after coursing approximately half way south along the project site's western property line. This upstream basin in approximately 5.4 acres in size, consists of a portion of the developed area known as Liberty Lane plat, and the remainder is undeveloped land. The runoff from the upstream basin will be collected and conveyed separately around the project site by being conveyed in the right-of-way of I 62nd Avenue S.E. II778.003.doc EXHIBIT A Vicinity Map VICINITY MAP NORTH SOURCE: THE THOMAS GUIDE (USED BY PERMISSION) EXHIBITB Downstream Drainage Map ~l ~c 0 ~ I\J ~. Ii 10 $- Ii S ~. % ; g EXHIBIT C Upstream Basin Map · ,." ur;;J , ~ ..... Sf"'" ~~~IN r i~ t---------________ j"ill:J,:~:' ____________ ~.,.~j i ~ 'I 1<)./ I "'~! Ii f-' "-"-"'\';'!'-~ 1 ," '':.~' ~H'" ~ , j~~iO',,"I!,jH , "~,, mJ", '-d!! "'11" .,-.. 145750 I ., :;-/.,D 1) PARK ."" ., • ,,~" 1'1 I r' -. F IV E ACRE TRACTS SITE". """f ,-/J ., .. ", I--------"'-"-------,~ __ _ TASK 2 RESOURCE REVIEW TASK 2 RESOURCE REVIEW • Adopted Basin Plans: The site is part of the Lower Cedar River drainage basin. Finalized Drainage Studies: This is not applicable. • Basin Reconnaissance Summary Report: Once again, the site is located in the Lower Cedar River drainage basin and drains to an area that has no mapped tributary (which would have been mentioned in the basin reconnaissance summary report if it had its own drainage basin). • Critical Drainage Area Maps: According to the water quality applications map in the 2005 King County, Washington Surface Water Design Manual (KCSWDM), Basic Water Quality treatment is required. According to the flow control applications map, also in the 2005 KCSWDM, Conservation Flow Control (known as Level 2 Flow Control) is required as a minimum. Floodplain and Floodway FEMA Maps: Please the enclosed Exhibit D -FEMA Map utilized for this analysis. Panel No. 1,001 of 1,725, Map No. 53033ClOOI F, revised May 16, 1995, indicates that the proposed project site does not lie within a floodplain or flood way of a stream. Other Off-Site Analysis Reports: A review of Exhibit I -Basin Reconnaissance Summary Report and the site investigation work conducted in the preparation of this Level 1 Drainage Analysis. The U.S. Department of Agriculture Soils Conservation Service (SCS) soils map is also provided (sec Exhibit F -SCS Soils Map). In addition, the off-site analysis prepared for the project site located immediately south of this site was reviewed for conformance with the findings from the off-site analysis performed for this project. Sensitive Areas Folios: Based on a review of the King County sensitive areas map folios, it was found that the subject site does not lie within a sensitive area. However, it does drain to a landslide hazard area further downstream from the project site and, ultimately, into the Cedar River, which is a salmon-bearing river. There are no wetlands or coal mine hazards, etc., associated with this project site or the downstream drainage course. • Road Drainage Problems: This is not applicable. • United States Department of Agriculture King County Soils Survey: Based on our review of the soils map for this area, the entire site lies within Alderwood type soils. Wetland Inventory Map: The wetland inventory map for this area was reviewed and it was determined that there are no wetlands on the site or in the downstream drainage course of the site. • Migrating River Studies: This is not applicable. 11778.003.doc EXHIBITD FEMAMap 8'07" __ ... _,_, _ ...................... ,'"" IV Inl~ r""I'III:L: Revised May '16,l996 to update map format. To determine if flood tnsur.mce is avail~. contad. an insurance agent or call the Nationaf Rood Insurance Program at [8001 638-6620. APPROXIMATE SCALE IN FEET 500 E3 o E3 !iOO I NATIONAL ROOD INSURANCE PROGRAM FLOOD INSURANCE RATE MAP KING COUNTY, WASHINGTON AND INCORPORATED AREAS PANEL IDOl OF 1725 (SEE MAP INDEX FOR PANELS NOT PRINTED) CONTAINS: COMMUNITY MAP NUMBER 53033C1001 F MAP REVISED: MAY 16,1995 Federal Emergency Management Agency >t I 135m STREET W w ::> ::> , z z ~ 14 ~ ~ 13 rW r .... '" I;; 0 SE 136TH ~ z SOlJ1l;EASt ~ N STREET ~ 136TH I \ \ 13/lTH STREET SE 137T H PlACE .... '" <i .... I 0 , " , w ~ .-B '" , '" ::> r 0 .... '" ::> 0 '" I SOlJTHEASt 14{)TH I "S, T£ ZONE X w ::> w I z ::> ~ z w '< SOUTHEAST 142NO I w .... ~~ , - ::t~ w '" 161ST AVENUE ::> w xo u V SE ~ U'I SE 143RD ~ x -PlACE ~ \ r t;; .... ::: ~ SOUTHEAST t;; .... 162ND AVENUE ;1i f t;; SOUTHEAST r g <i 144TH .... w ::> r SE 0 ti? STREET .... '" 145m ::> g-O '" SE ,45TH w t;; § ::> ;1i z '!\ w w X > .... u <i ::> w S 0 u SE 14tiTH PlACE n. '" S n. w ~ U z 23 s c n. "' ~ q ~ r x ~ .... ~ «'", m ~ FEMA MAP NORTH EXHIBITE Sensitive Areas Folios 1/2 0 "lE COAL MINE HAZARD AREAS NORTH SOURCE: 1990 KING COUNTY SENSIT IVE AREAS F OLIO 112 0 MILE SEISMIC HAZARD AREAS NORTH SOURCE: 1990 KIN G COUNTY SENSITIVE A REAS F Oli O 1/2 0 UL E LANDSLIDE HAZARD AREAS NORTH SOURCE: 1990 K ING COUNTY SE NSITIVE AREA S F OLIO 1/2 0 MlE .r~ ~ . t '\ .. '>"o\:JDja/ EROSION HAZARD AREAS NORTH SOURCE: 1 990 K ING COUNTY SENSITIVE AREAS FOLIO 112 0 ULE STREAMS AND FLOOD HAZARD AREAS NORTH SOURCE : 1990 KIN G C OUNTY SE NSITIVE AREAS F OliO 112 0 "LE WETLANDS NORTH SOUR CE: 1 990 K ING C OUNTY SENSITI VE A REAS F OLI O EXHIBIT F SCS Soils Map , ~ . Age Py AkF -,. SOILS MAP NORTH EXHIBITG Assessor's Map -. ,_,,-:j~---____ :..!,~!2...L_ , )I : " -" .,~" ~ ~ . - ,'''", ___ ~.c!..!, ... ~. So.E .13MIi ST ~ ;o i ,,,,, -1{1 _ _________ ~_~ ~J __ -__ 1iJ :;q," ~ =; -,. '" j, I: _ "".._ ,,,' , . "I II {-,,,,,,, ~ L-.-"'------J 1 ! :1 I i ~ r-----------------J!~""L---------____ ~~~J j " ~ , -, " .. : "''''. --' ~ H~l ' ,l1l!lll ~I i",~e ,; 'I~'~'I -' ... ~',-::. ' .. - r '-'''1 I -llM/ ~ -,n'-·-"r.1:-'----~ .. ,,, "'"~ ---= . .(', ---:---.. 14!)7 !;O I .C E D A R P A R K F I V E A C R E T R A C T S ,--:c.' I -I = ,i ~ ~ , -. S TE ~ .. I ;.- I ~:> frl\ ,,", = ';', . " -~ ""1 "''::? r , I I ;,'- , I I -' t =::--, . .1" I I I '\" ~ = .,," ~ ASSESSOR'S MAP NORTH EXHIBITH Wetland Inventory Map EXHIBIT I Basin Reconnaissance Summary Report RECONNAISSANCE REPORT NO. 13 LOWER CEDAR CREEK BASIN JUNE 1937 Naturdl Resources and Parks Division and Surface Water Management Division King County, Washington Depanment of Public Works Don I.aHclle , Director King County Executive Tim H ill King County Council Audrey Gruger, Distri ct Cy nthi a Su lliv a n, Di s tri ct 2 Bill Reams, District 3 Lois Nonh, District 4 R o n Sim s, Di s trict 5 Bruce Lting, District 6 Paul Harden, District 7 Bob Grieve, District 8 Gary Gra nt , District 9 !'arks, Planning and Resources Joe Nage l, Director Surface Water Management Division Joseph J. Simmlcr, Division M an,age r Jim Kramer, Ass isl an l Divi s ion Manager Dave Cla rk , Man ager, River & W<lt er Natural RcsouI'CCS and Parks Division Russ Ca hill , D ivisio n Mantlgcr nil! Jolly. Acting Divi sio n Manager D erek Poon, C hief. Reso urce s Planning Sc.::cti on Bill Ecke l, Manager. Basin Pl ilnning Program R eso ll fce Sect ion Larry Gibbo ns, Manager, Project Ma nage me nt an d Des ig n Secti o n Contributing Staff Doug C hin. Sr. E ngi neer Randall Parsons, Sr. Engi neer Andy Levesque, S r. E ngi nee r Broce Barker, E ngi neer Arny SlO nkus, E ngin eer Ray S teige r, Engi neer Pete Ringen , E ngi neer C-O osulting Staff [Jon Spencer, As.c.;oc ial e Geologist, Eart h Co nsultant s, [n e. J oh n Bethel, Soi l Scie nti st, Earth Consu lt a nt s, Inc. P:CR Contributing Staff Ray He ll e r, Project Ma nager & Team Lea der Malthew Clark , Project ManLl ger Robert R. Fue rs te nb erg, Bioiogisl & Team Leader Matth ey.: J. Bruengo, Geoio gisl Lee Benda, Geologist Derek Boo th , Geologis t Dyanne S held o n. \V etla nd s Biol ogis l C ind y Ba ker , Ea rth Sc ie nti s t Di Jo hn son. Planning Support Techni cia n Roben Rad ek, Plannin g S up port Technician Randal Bays. Planning S upport Technician Fred Bentler, Planning S up port Technician Mark Hud so n, Planning Suppon Technician Sharo n C lau se n, Planning Support Technician David TnJax , Planning S up po rt Technician Brian Vanderburg. Plannin g Support Techni cian Carolyn M . Byerly, Technical Writer Susann a J Jorn ig. Tec hn ica l \Vrit c r Vi "rginia Newman, Graphic Artist Marcia McNult y, Typesctter Mildred Miller, Typesetter Jaki Reed, Typesetter Lela urn, Office Technician Ma n y Cox, Office Technician TABLE OF CONTENTS I. SU MMARY [I. [NTRODU C nON m . [v. V. FINDIN GS [N LOWE R CEDAR R[VER BAS[N A . Overview o f Basi n B. Effecls of Urbani w li o n C. Specific Problem s I. Drainage and flooding problems 2. Damage 10 pr ope rt y 3. DeSiruclion of habilal RECOMMENDATIONS FOR ACTION A . Redu ce land s lide ha z"lrd s B. Redu ce erosion a nd flooding C. Pre vent future erosion and flooding with appropriate analys is, plannin g, a nd policy development D . SlOp prcsenl (and prevenl fUlure) damage 10 habilal by addressing speci fi c problem s in stream sys te ms MAP APPENDICES: APPENDIX A: ES limalcd COSIS APPENDIX 13: Capil3! Improve menl Projeci Ranking APPEDDIX C: Detail ed Findin gs a nd Recommendations 2 2 4 5 5 6 6 7 7 7 8 s II A-I B-1 Col I. SUMMARY The Lower Cedar River Basin, in southwest King County, is unique in its development pat· terns and the as."",iated environmental problems th a t a ppear throughout the basin . Except for the c ity of Renton a nd areas o n the Ceda r River Vallcy fl oor, most of the d evelopment in the basin h as occurred on the upland plateaus. Most of thi s development is r ece nt and primarily residential. In addition, the plateau is the site of numerous sand and gravel mining operations and, in the southern uplands., an abandoned coa l min co Peat is a lso being min ed nOI1 h of Otter Lake. In some areas lives tock are being raised on sma ll farm s; there arc no major crop-related agricultural activities in the basin. The cffects o f d eve lopme nt are most apparent where stann drainage is rou ted over the valley walls. Impervious surfaces on tbe plateau ba\Ie increased tbe 13le and volume of storm JUnoff, resulting in substantial erooion, siltalion, and flooding below. In addi· ti o n, eJU5ion and siltation have damaged or destroyed habitat in many tributaries, Ihrealening th e s urvival of [ish . I1 abilat and water quality thro ughout the basin are a lso threa tened by Ih e filling of wetlands a nd the presence of IaJgc amounts of domestic Irnsb in some s treams. The reconnaissance tea m notcu that the Peterson Creek system has so far remained in its nalUral, nearly pris tin e condition. Maintaining thi s qua lity should be a hi gh priority in future basi n planning capi tal project programs. Recommendalions in Ih e Lower Ceda r River Basin include 1) designing and constructing appropriately siz.cd RID a nd ot her drainage facilities; 2) establishing stricter land use policies regarding floodpl ains, wellands, and gravel minin g; 3) conducting more detailed and comprebensive hyd13ulic/hydrologic ana/ys<:s of proposed devel opments; and 4) preventing damage 10 the natu131 drainage system. The field te a m also recommends 5) restoring tbe habitat of severaJ tributaries (e.g., clea nin g gravel~ revegetatin g strea m banks, and diversifyin g s trea mbeds for s pawnin g and rearing) as well as 6) protecting the nearly pristine quality of PetclSOD Creek. 11 . lNl'RODUCIlON: History and Goals of Ihe Program p oLe In 1985 the King Count y Coun c il approved funding for the Planning Divi s io n (now calied th e Naturdl Resources and Parks Division), in coordination with the Surface Water M a nage me nt Division, to co ndu ct a reconnaissance of 29 major drainage basins located in Kin g County. T he effort began with an initial inve st igation of three basins --Evans, Soo~ and JIylebos Creeks --in o rder to determine ex is ting and potential surface water problems and to reco mm e nd action to miti ga te and prevent th ese proble ms. These initial inve s tiga- li o ns used available data and new field observations to examine geology, hydrology, a nd habit Cl t conditi o ns in each basin. Findings from these three basins led the Kin g County Council 10 adopt Resolulion 6018 in April 1986, ca lling for reconnaissance to be completed o n the remaining 26 basins. The Ba s in Reconnaissance Progra m , which was s ubseq uently es tablished , is now an important ele- ment of surface water management. The goa ls of the program a re to provide usefu l data with regard to 1) critical problems needing immediate so lution s, 2) basin characteris ti(:s for u SC in the preparation of d e tail ed basin mana ge ment plans, and 3) capiwl costs associated with the early resolution of drainage and problems. The rcconnaiSS<1nce reports are int e nded to provide a n evaluation of presc nt draina ge con- ditions in the Cou nty in order '0 transmit information t o policym a k ers to aid them in developing more detailed regulat ory measures and specific capital improvement pl~tns. They arc not int e nded to asc ribe in any conclus ive manner the causes o f drainage or erosion Lower Cedar River Basin ( co ntinued ) proble m s; ins tead , Ih ey are 10 bc used as inilial s urveys from whi c h choices fo r s ubseq uent detailed e ngineering a nd o lh er pro ft.:ssio nal environmental analyses may be made . Duc to the limit e d a mount o f lime available fo r the fi e ld work in each bas in , the reports mu s t be viewed as descriptive environmcnt;]l narratives rather than as final e ngineering conclus io ns. R ecommenda tions co ntained in each report provide a desc ription of potential mitigative measu r es for each panicular bas in ; these measures mi g ht provid e maximum environmental protection throug h ca pital projec t cons lructio n or deve lopmen t approva l cond iti o ns. The a ppropria te e xtent of such measures will be decided o n a casc-by-casc basis by County offi- c ial s responsible fo r reviewi ng appli ca li o ns fo r permit a pprovals and for c hoosi n g among com pet in g projects fo r public co ns trucli o n. NOlhin g in th e re p orts is int e nded to s u bstilUtc for a mo re thoro ug h e nviro nm e nral a nd engineering ctnalys is pos.'S ible o n a s it e·spccifi c basis for any p ropos.1 1. m . HNDfNGS IN LOWER CEDAR RIVER BASrN P :LC The fi e ld reco nn a issa nce of Lower Cedar Ri ver Ba s in was co nduc l ed in January 19 87 by Ro bert R . fuerstenb e rg , hiol ogist ; IJrm:e L. B.'uker, e n g in eer; and Lee Ucnda, geologis t . Their findings and n::coillme ndali o ns arc prese nted here. A. Overview of Lower Cedar River Basin The lowe r Cedar Ri ve r Da si n is loca t ed in sou thwest King Count y a nd is 27 sq uare miles in area . II cx le nd s so ulhea s t f ro m Ihe mo uth of the Cedar River o n L1ke Washington 10 approx im a te ly ri ver mi k 14.0. The h o undarv to th e north east IS marked by a riugel op con ncclin g th e cit y of Renton to Wehste r and Fra nklin Lakes: the h o undary to th e sou thwest runs along Pe trovitsky Road to Llke Yo un gs. Renton is Ih e on ly incorporated a rea in the basin. O ill er pop ulali o n centers include Fairwood , Map lewood Hei ght s, and Map le Valley. Except fo r th e c it y o f Rent o n, mos t o f th e resi(.kntia l co ncc ntra l ions are loee ll ed o n the upland plalcaus ove rl ooking th e Cedar River Vallev. These upl a n d deve lopmen ts arc recent compare d to the smaller estab li s h ed com mun i li es o n Ih e va lley fl oor. The basin li es within port io ns o f three King Cou nly planning areas: Newcastle in the northeast (which includes R e nton), Tahoma·Raven H eight s in th e east, and Soos C reek (th e la rgest of the three) in the ",'esl. Rural a reas ex is t o n the v:t ll ey fl oo r o n both si des o f t h e I .ower Cedar River. f rom app roxi matel y river mil c 5.50 to l3.00. These Clre limit ed 10 pastul'eland for ho rses, CO"'S, .lnd some sheep a n ti severa l s m a ll "u·pick" fruit an d vegetab le farm s. Si mil ar a reas are loca te d o n th e so ulhern uplands above Ih e reach from r iver mil e 5.50 to 7.00 and in Ihe La ke Dcs ire·Oll cr Llkc arc .. !. The plateau is also the s it e o f s.:''l nd and gravel mining opera ti o ns a nd, in the sou the rn uplands, o f the a b a nd o ned F ire King Coal Min e. Peal deposi ts ex ist wCS I of Lake Desire and north and south o f Oltcr Like, a nd pe,lt minin g is being ca rried o ut north of O tter Lake. Presc nt zonin g allows for urban and subuman d e ns iti es Ihro u g houl much o f Ih e b asin, particularly o n Ih e upland plale,l)u s and in Ihe Cedar River Va ll ey from it s mouth 10 appoxi mately r iv er m ile 6 .50. P o pulati o n projections fo r th e yca r 2000 in Ihe three plannign areas (onlaining the Lo we r Ceda r Ha s in a re over 311.000, a n increase of 47 P :LC Lower Cedar Ri ve r Ba s in (co nt in li e d) percenl from th e present. Mos . o f th is growth will occur in the Soos Creek Planning Area. Dominant geological and geomorphic features. T he geology o f th e Lower Ccda r R iver Basin is diverse . Geological form at io ns exposed along the valley include sedim e nt ary rocks , undifferentiated older glacial drift , extens ive g round morain e d cposil S, re ce nt alluvium along th e Cedar River, and la nd s lid e deposi ts a lo ng the ri ve r and it s tribu- la neS. The se dimentary rocks, composed of m ode rately dipping sand stones , co n - glomerates., mudst o nes. and shales, arc exposed loca lly along Ihe cliffs of Ih e Cedar River Va lley near the mOlllh of th e Cedar River. In a ddition , Ih e Rent o n formati o n , co mpose d of sand stones., mud stones, and shales w ith periodic d eposi t s of coa l , is also exposed along lhe lower po rti o n of th e Lower Cedar River Vall ey. Undifferentiat e d g lacial depos it s fo und here arc composed of three o r more till s hee ts, giacio·flu vial sand and gravel, glaci o.lac us lrin c clay , and sa nd , and no n-g la c ia l sa nd , clay and thin peal. These li e over th e sed imenta ry rock fo rmmions and .Ire b est exposed in cros.'S ·secti on a lo ng the cliffs o f th e main va lley and m aj o r tributaries. The mo rphology o f th e Lower Ceda r Ri ver Da s in is do min a ted by th e va ll ey fo rm e d b y th e Cedar Ri ve r. Va ll ey wall s ilrc Sleep cliffs formed by land s lides in gla cial sedi - ment s. A once extensive a nd meandering Ri ver, which created a wid e valley floor as il (ut it s wa y we s twan..l, the Ce dar toda y is diked f or most o f it s le ng th through th e lower va lley. A narrow but exten sive b a nd o f la nd s lid e deposit s ex is ts a lo ng the Sle ep cliffs of the main ri ve r and its maj o r t ribu tari t!s. The lands lide de posi ts co ns is t o f deform e d blocks o f glacial sediments a nd colluvium derived from s lid es or ma s.s flow age , s uch as la ndslides and d e hris fl ows. R ece nt alluvial d eposit s fiJI th e va lley and ma jo r tributari es. Sm a ll, compos ite, alluvial d e bris fan s exi s t at th e mo uths o f th e large s t tributaries. C losed d e pressions, principclll y in th e uplands, h ~lvc la c us lrin e and peat deposit s. The Lo wer Cedar Ri ve r Valley ha s a hi gh pote nt ia l fo r erosion du e to steep s lopes and th e ex is tence o f a cl ay layer that prom o tes soil failure s. In addition, the confin e d nature o f tributary chann e ls be tween s te e p hill s lopes pro mo te s bank erosio n during hi g h fl ows. Numerou s rece nt land s lide s a rc evident along cliffs of ma ny o f th e s tee p trib ut a r ies and along th e main s lem o f Ih e Cedar Rive r. These hewe heen accele rated by th e removal of veget a ti o n and the routing o f concentrated storm flows over Sleep s lo pes in areas where d eve lo pment has occurred . Hydrologic and hydraulic char .. ctcri'5lics. The Ce d a r Ri ve r Ba s in is co mpose d of a compkx drainage nctv.'ork cons istin g o f Ihe Cedar River a nd 17 Irihutarics. Th e larger tributaries begin in lak es o r wetlands o n th e hluffs and fl o w thro ug h relati ve ly flat , s tahle c ha nn e ls to Ih e edge o f th e Cedar Rive r Valle y, the n plunge d o wn t o Ih e va ll ey fl oor thro u gh Slee p, erodible ravines. Tributaries of thi s type s uch as T ribut a ry 030~ (with he a dwate rs a t Wetland 3111) and Triblltarv 0323 (which b egi ns at ulke Desire), a re fo und o n th e so uth s id e o f the Ced a r Riv er. A not hc r ty pe o f tributary co llec ts s urface run off from urb,ani zed areas. pa s turcland! and wood ed areas. Tributaries 030~ 0307, a nd 0312 are examples o f thi s Iypc o f tribut a ry . They a rc intermitt e nt (depending o n rainfall), s horter in length, fl ow Ihrou g h s ha ll owe r cha nnels th a i are s tceper a t the bluffs a nd trans port mo re ma t e ria l during tim es o f , -, Lower Cedar Ri ve r Ba s in ( conlinue d) hi g h fl ows. Some of th e worst problem s loca ted during field investigation (see Appendix C for a full li slin g) occur o n Ihis Iype of Iribul ary. Caleh mcnl s 5, 6, and 12 have very infillralive soils. RI D poinds 10 effeclively infillrale all urban runoff hill s lopes. Th e infillra le d runoff Ihen reappears as Urba n d eve lopmenls hva e ulili ze d before il reaches Ihe valley springs. T wo la rge lakes (Desire and Otter). toge th e r with four smaller o ne s (Shady. Pctcrson 1 Webst er, and Francis) lie in the southeast third of the basi n . Numerous large wetland areas exist in thi s section as well. The field team identified 10 potential wetland s it es Ih a l ha d nOI been previouslv idenlified in Ih e Scnsi livc Areas Map Folio (SAMF). The sys le m of lake s and wellands in Ihi s a re a effcclively buffers Ih e hi g h flows draining 10 Ihcsc Iributari es. lIabilal characteristics. Wilh few exceplions, usable fish ha!>i"" exists only in peren- ni a l Slrea ms (i.e., Trib. 03 02, 0304 , 0305, 0328, and possibl y 0303 ). In olher s lrea ms (e.g ., Trib. 0303 a nd 03 10 ), Sleep gradienls preclude fish usc . S le e p gra di e nl s a lso re du ce fi s h use in th e perennial sys tem s (exec pi for Trib. O~2 ,~). H<Jbitat is in various s tages of d t!grada l io n in th ese systc ms; pools a re be in g fi lkd and gravels and d e bri s s hift regularly . In Tributary 0328 (Peterson C reek), howeve r, habitat diversity is extcnsivc~ and the ch a nnel is not seriously degraded. At thi s loca ti o n the field tea m obse rve d at least th ree specie s of salmonoids. In ge neral, th c most di verse a nd leas t di s lU rbed habitat in a t rib ut ary syste m occ u rs in th e large wetland areas in th e southeast third o f th e bas in . Usab le habitat for a nad ro mo us fi s h is found in th e low-gradient portions of strea ms where channels c ross the Ce d a r Ri ve r Valley fl oor. In th ese rcaches, however, on ly s pawning habitat is likel y to be aV~lilabl e, as the pools and woody debri s nece ssary for s ucce ssful rearing e ither d o not exist or are quite limited . Exc..:e llent spawning and rearing areas exist wh e re pools and riffles a re ex te nsive, in s lream cover and bank vege t a tion are int ac t, a nd diversity of habitat types is abundant. B. Effects or Urbanizalion in the Basin F lood ing, erosion, a nd th e d egrad a ti o n of habitat associated with development in the Lower Ce dar River Basin are most apparent where devel o pm e nt has e liminated vege- ta ti o n along the edges o f th e valley and where s tormwate r ha s bee n routed down c ha nn e ls a nd ~w.lllc s. The r e mova l o f vegera ti o n ~ such as t rees, above a nd belov,.· the edg.es of va lley wall s., a s well as the di sc harging o f s tormwat e r over the va lley wa ll , ha s re s ulrt::d in tens io n c racks and land s lid es thm a re e ndan ge rin g so me ho use s. The se di- ment s from th ese fai lures a re de}X>S ilin g in s trea ms and o n va ll ey n oors a nd dam agi ng fis h habi tat and private property_ Di sc harg in g storrnwater from increased impclVi o us areas inl o s teep tributary channels and swa lt::s is seriously d estabi li z in g channels and valley walls; this in turn results in c hannel d owncutting, bank e rosion, and lands lide s. The sediments from th ese problems often d eg rade fish habirat and sellie out o n pri- vate property a lo ng the valley fl oor. Two se ri o us instances o f development-related e rosio n occurred during the November 1986 s to rm : I) culvens rerouting the s tream were plugged, ca us in g th e fonnation o f a new c ha nnel that des t royed portions of roa d s o n Tributary 03J4; and 2) new, unc o m- poL e 4 P:LC Lower C edar River nasin (continued) part e d fill adjace nt to new resi dences ncar collection point 5 was wa s he d partly away durin g the siorm, ca us ing land s liding and gullying. Future problems will be similar to these, as commercial and residenli.ill d eve lopment s increase flow rdtcs and volumes by decreas ing nalural s torage and infillfali o n. This is expected to occur if wetlands on the upper plate.;1u arc encroached upon or losl (e.g., on Trib. 0304 at RM 2.30 a nd o n Trib. 0304/\ at Rm 1.60). The preserva tion of wetlands and strcambank vegetation and th e Clltenuation o f s to rm flows are essential in this basin. c. Speciric ProblcllLs Identified The stee p va lley si dc slopes through which s trc"nlS pass and th e oftcn den se upland devel o pment res uH in a number o f s imilar prob lems that r epeat themse lve s throu g ho ut the Lowe r Cedar River Basin. The mos t s ig nifi ca nt of these are outlined and discu s.sed below. 1. Drainage and flooding problems are often the n..-.;ult of several mnditions: 3. Undersized culverts and inadequate entrance structures. The most nOlabk area is on Tributary 0306 al rive r mile 30, where it culvert here wa s blocked by debris carried down Slrcam by the st ream and ca used e ros io n anJ floodin g o f Fnirwood Golf Course . The block age was compounded by th e facl th a t the culvert wa s unders ized ; the proble m will worsen li S fl ows increase fr o m upstrea m d eve lo pment. b . Serious instrcam erosion aDd SUbsequent downstream sedimentation. These have been caused by Ihree main ractors: 1) run o ff from rcs iocntiaJ developments on the bluffs above Ihe valley. 2) co mpacted pa s lure land due to li ve s toc k, and 3) runoff fro m impervious area s o riginating at grave l pits. These proh lems will continue and worsen until mitigative meas ures arc laken . (See Appendi x C for s pecifi c examples.) C. Undersized recbannclizcd streams. Tributaries o n th e valley fl oo r are too small 10 ca rry lhe increased fl o ws o riginatin g in developed residential areas along the lOp of the bluffs. For exa mple, TribuICII), 0302 at ri ve r mile .25, the channel along Maplewood Golf Course, overtops and fl oods during storms. d. c. COnslruction in wetland and floodplain areas, Man y of th e we tl a nd s on the south s id e of Ihe Ce dar River arc peat bogs.,. and roa ds built thro ugh them continue to se ttle each year, increasing the amount of floodin g o n the road . For example, Ihe road e ros-s ing with Tributary 032HB nol1h of L1ke Des ire will experience more severe flooding as the roa d se ttles. Discharging or stormwatcr at the top or steep bank... At riv e r mile 2.20 o n the Cedar River. a t ra iler park (constructed on Ih e edge of Ihe cliff) discharges its drainage d(wm the va lley wall . Increased flow s erode th e s teep valley? depositing sediment s o n th e valley fl oor,. hlocking channels and causing flooding. These problems will eventually s tabilize. but on lv after a large quantity of soil ha s bee n eroded. 5 P:L C 2. Damage to property is being caused by three factors: Lower Ce dar River Basin (continued) a. Land<lidcs and potential landslides. Land s lid es a re accelerated by th e r e moval o f vege tat io n on steep slopes in prepara tion for re sid e ntial cons truction a nd /or by the routing o f storm fl ows over hill s lopes . Fo r exa mple, a la rge la ndslid e ha s already occ urred in th e fr o nt yard o f a resi· d e nce o n the Cedar River at ri ve r m ile 7.80. b . Sedimentation (from lands lid es). Sedimentation a nd cha nn e l and "ank ero· si o n arc dama ging private prope rt y along (he va lley floo r (Trib. 01:99 a nd 0310). c. Jolooding during stonns.. Hoodin g ha s been bro u ght o n by the effects o f deve l opment and assoc iated cha n ges t o th e nalUral drainage sys t em s i n the b<lsin. (See"B" above.) 3. Destruction of habitat is being caused by four conditions: a . Sedimentation of pools and rimes and a:mcnling of graveL"-Th ese prob l c m s~ the re sult o f seve re erosio n and th e t ranspo rt o f hedl oa d m a lerial, h ave been caused by upland develo pm e nts in th e basin and the presence of assoc ia ted impervi ous s urfa ces, which in c rease: th e r atc and quan tit y o f s urface run off. Sedimentation and ce m e nting o f grave ls in s t ream beds dcs lroy natura l s pawnin g and re<.lr in g habitat. On Tributary 0 3 07 at river mile AO and Tributary 0305 at ri ve r mil es .95, 1.20, and 1.70~ r ece nt high fl o ws have eroded the s lI"ea mbcd <.It lea st o ne foot ~ ~o nlribulin g to a se riou s s ilt ation prob le m downstream . H eavy bedl oa d tra nsport is evi- dent in a ll systems o f Ih e basin except Tributary 0 328. In Tributary 0 :;03 at ri ve r mil e .25, fine sediments are accumulating in gr avels thai m ay be used by r esident fi sh . In Tributary 030-1 between ri ve r mil es .95 and 1.20. pools are being fill e d by sands a n d grdve ls a nd rea rin g habit a t is being rapidlv los t. b. Chanoclization of stream beds. L.oss o f hab it at thro u g h channelization has (xx:urred in a ll th e major streams of the basin , put most no t iceab ly in th ose rC ;lc hes that cross th e valley fl oo r. These r eac h es lack hahir al di versity, r educ in g fish use for spawning a nd rearing. Channeli Lation has da ma ge d or de stroyed h abi t a t in several reaches Ih(lt we re o n t.:e h eavily used by fis h ; th ese include Tribl,tary 0 302 be tween riv e r mile 30 a nd 40. TriblJlary O:;O-l b e lween r iver mil es .OS and .IR: Tributarv 0305 between ri ve r mil e .20 a nd .75, and Tributary 0.123 from ri ve r mile 1.10 to lA O. Th ese sys te ms ca nn o l afford a fun h er re duc ti o n of habitat a nd s till rema in v iable fishery resou r- ce s. c. '(be 3COJmul.ation of trash in stn:am beds. This prob lem occ urs in cl ose prox imit y 10 residential areas. Trash degrades waler qualify a nd is vi s uilll y unpleasant Tire~ applian ces, furniture: and olher tra sh ha ve bee n thro wn inlo Tribu t ary 0302 at ri ve r miles 1.00 and 1.10 and in Tributarv 0303 a t ri ver mil e .35. (, Lower Cedar Riv e r nasin (continued) d . Wetland encroachment. Encroachment de stroys hahitat Clnd eliminatcs nalu ra l wa ter filtration a nd sto r.tgc for s urface run off. Exa mpl es of this proble m we re o bserve d on Tributary 0304 at river mil e 2.30. Tribut"ry 0308 at .80, a nd Tributary 0304A at river mile 1.80. Man y wetlands have already been com pl e te ly los t thro u gh filling~ for example on Tributary 0306A at rive r mile .55. Suspected violations were forwardeu to Bu ilding and l .a nd Development for e nforce me nt. rv. RECOMMENDATIONS FOR ACTION P:I.C The primary recomm e ndati o ns for action in th e Lower Ceda r Ri ve r Ba s in addresses curren t seve re probl e ms related to erosion, hab itat d estructio n, and fl ood in g . Prevention of th ese probl e ms will be accomplished by con tro lling loca ti o ns and den sities of new developm e nt and providi ng adequate R I D facilitie s for s to rmwat er. A. Reduce landslide bazards by: 1. Including sensitive areas Dot prcviou.o;Iy mapped on the Sensitive Areas Map Folio (SAM F). See AppendIX C fo r a full li s tin g of sensiti ve areas. 2 ~blisbing building setbacks along cliffs. and native growth prote cti o n case m e nt s along s teep r av int:s. 3 . Discouraging or clim.inaling the rouling of stormwatcr over cliffs, unl cs.s C1Jequate tightline sys te ms can be co ns tructed to convey flows in a s.afe . no ncrosive ma nn er to th e bottom of diffs. 4. Dccn;asiog peak nows by con s tructing la rger RI D fa c iliti es to le sse n th e lanu slide and eros io n OCCu rrence a lo ng trihutary slopes. n. Reduce eJOOion and nooding in tbe basin by improving surface wdter management: 1. Direct the F acilities Management Section of tbe Surface W .. ter Management Division to t."V3luate existing storm..<Jctcntioo and conveyam .... c facilities to deter- mine whether th ey a re prope rl y size d to mee t current s tandards. Eva luati o n s ho uld h eg in with a ll s ingle-orifice RI D f.:u.:ilitie s. 2 C.olL<ider areas otber tban wetlands as regional Slonn-detention facilities. Tributary 0300 at river mi le ...12 is the s it e for a proposed d a m, for exa mple. 3. Utilize exi.<;Iing lower quality wetlands (thore rated otber than #1) as regional Slonn-dctcntioo facilities... V/e tl a nds 3 102 and 3142 could provide m ore li ve s t orage, for exa mpl e. 4 . Review channel and culvert capacity for conveying existing and future runoff, and establish fJoodpli..lin areas in regions o f sl ig ht grddienl for exis ting: and future runoff conditions. 5. I'romotc thc infiJtr.dion or surfacc water through the usc or retcntion faci[j(ics and open channeLo; instead of pipes where the soil and s lope co nditi o ns permit. Co llec ti o n poi nts 5, 0, and 12 on plafeaus have s uc h soi l co nditi o ns. 7 P :LC Lower Cedar River Basin ( continued) C. Prevent future problems of erosion and flooding with appropriate analysis, planning. and policy development related to surface water management: 1. Conduct a detailed. comprehensive bydrnuliclbydrologic analysis of any proposed developments to determine impacts on the drainage courses downstream, This IS especially critical for areas on the upper bluffs and plateau, which drain over steep, sensitive banks above the Cedar River. 2 Conduct a study of tbe impact of locating infiltration pond~ utilized ncar the edge of the bluffs to detennine their effect on seepage faces on the lower face of Ihe bluffs, This might be accomplished with a compuler~hased ntlmerical model of the groundwater flov.', 3. Require tbe tigbtlining of storm drainage down steep or sensitive slopes when they cannot be directed away from the slopes, This is done hy piping the flow down the slope and discharging it at the bolt om with adequate energy dis...:;ipation. Many of the intermitlent tributaries flowing down the banks should be ti~llIlincd as urban development increases flow to them. 4. Construct new RID ponds with mter berms to improve water quality and reduce fine sediment loads. New RID pond!oi should have tv.'o cells with gravel-berm filters and vegetated ~'a les at the inlet and outlet. Consider Tributaries 0304, 0304A. 0301, and 0303 as sites for this type of facility in order enhance water quality. 5. Maintain oatural vegetation 00 streambanks and noodplains. This is especiallv important for relatively flat channels flowing on the plateau before they reach the Sleep bluffs because these channels and their floodplains will a((enuate flows during times of heavy runoff. 6. Maintain buffer areas around wetlands. Many of the tributaries on the south side of the Cedar River headwater at wetlands. These wetlands act as natural slOrage areas during storms. 7. Reevaluate King County policy regarding permitting for gr-.!VcI mining on steep. sensitive slopes. 8. lnclude tbe city of Reo lion in future intcrlocal agrccmenL"i for plannin~ and capi~ tal improvement projects where city and county interests overlap. D. Eliminate present damage to habitat and pn:vent future damage by addressing specific problems in the stream systems. The following activities should be coordinated among King County, the Mucklcshoot Indian Tribe. and State Departments of Fisheries and Game: 1. Reduce damaging storm nOW'S with greater dctcntion volume and lower release rdtes at upstream developments. 2 Implement restoration projects on Tributaries 0304 (river mile .00·.20). Trinutary 0305 (river mile .20-.80). Tributarv 0303 (river mile .25·.35), and Tributarv 0328 (river mile 1.10 -lAO): 8 P:LC Lower Cedar River Basin (continued) a. On Tnbutary 0304: Clean streambed gravels, add habitat and bed-control weiIS, and plant bank vegetation for shade_ b_ On Tnbutary 0305: Construct a new channel and move stream from road- side channel to its new location on adjacent lands. Implement a full restoration projecl 10 provide channel meandeIS, habitat structures, pool/riffle enhancemenl, streambed gravel replacement, and revegetation_ Co On Tributary 0303: Move stream from present channel to a location further north, away from the roadside_ If relocation is not possible, these minimum steps should be laken: Add habitat structure to existing channel with root masses, defiectoIS, boulder c1usteIS, and other features; rL'Vegetate channel banks with shrubs and small trees; enhance stream crossings with bottomless pipe arches_ d_ On Tributary 0328 (peterson Cn:et): Add habitat structure by replacing the straight, shortened channel with a more natural, meandering one; place habitat structures (such as root mas..'i(,'-s~ deflectors, cover log~ and boulder clusters) throughout the channel: and revegetate banks ",;th shrubs common 10 adjacent riparian zones (salmonberry, ninebark, or dogwood, for example)_ 3_ Protect the Peterson Creck system (Tnb-0328) in its present, near-pristine state_ This will include not only the restoration outlined in section A above, but also the adoption of land use management regulations to prevent future habitat destruction: a_ Protect all existing wetlands within the subcatchmeots of Peterson Creek. Employ wetland buffers at least 100 feet wide without exception_ b_ Restrict cte.elopment in the critical headwater area (drainage, habitat, water quality) hounded by Lake Desire, Otter Lake, and Peterson Lake to rural densities. Co Designate and protect streamside management wnes of at least 100 feet from the ordinary high-water mark (OHWM) along the main stem of the creek. Use 25 feet from the OHWM on tributaries_ d_ Preserve floodplains and their forests for dynamic retention of sediments and water. e_ f. g. Restrict vegetation removal in streamside/wetland management woes- Size RID facilities to store the tOO-year storm at a two-to-five-year release rate_ Use tbe lwo--ceU type 0{ pond with a forebay, a gravel filter, and a vegetated swale outflow where feasible. Regulate more closely aU septic tank and drain-f'1C1d instaIJations, as well as maintenance schedules, particularly in the Lake Desire, Otter Lake, and Peterson Lake drainage areas. 9 4. P:LC Lower Cedar River Basin (continued) h. Work with the State Department of Ecology to establish muumum stream- now requirements for Peterson Creek and Lake Desire tributary. Develop and promote public education and involvement programs for basin awareness. Work with school~ environmental groups, and the civic and business communities to conduct educational and restoration programs. IO :,i ;il / I, -:------/---~ \) I. r r -1 ! "':{'~,-,~>-. .".. .,-,.,i~~\,_o " ,i I' ,,,,,,I' r 1<, ''''1101 '~ I' ---; "-m, ("'.' , " /~j_L I I, " .Ii ,':' '~ " " ~,. .( /, ~.;, ,.,,, '", 1 . ",I" I,i· i y::- \ , , \ \ \ ' , '" • (, ~;'i.ld '" ~ -----j,------'-_';t~',-_~ __ ~ __ _ LOWER CEDAR RIVER BASIN Basin Boundary Subcatchment Boundary ® -------0299 .3115 Collection Point Stream Tributary Number Proposed Project o 2 Miles . JulY. 1987 ( \. • -----~\ -------, ~ ( ?'\~ ~ / I '" / I~" ... < cd> ~ '-, <:.... --'~-'~sj N 4- APPENDIX A ESTIMATED COSTS: PROPOSED CAPITAL IMPROVEMENT PROJECTS LOWER CEDAR CREEK I3ASIN " Indicates project was identified by Surface Water Management office prior to reconnaissance. NOTE: All projects are located on map included in this report. Project Numher 3105' 3109' P:LCAP A Collect. Point 10 10 Project. Deseript ion Enhance 2200' of Trih. 0305 from Cedar River to Elliot Bridge. Secure easements to wetland located in Cascade Park and construct a berm at the outlet. Replace existing catch ba~ins with control stnlcturcs. Project should he justified by a h<lsin study. Wetland rated #2, (This wetland will require further biologicfJi cvahHltion before RID design and construction.) Prohlem Addres<ed Mitigates flooding of King County park land. Detter utilizes wetland's storage capacity to addres~ peak flows from surrounding urban area. A-I E~timated Costs and Comments $115,000 (NOTE: This project waS proposed by Surface Water Management, is in the design phase, and will be constructed by 1989.) $186,000 Project N,"nher 311 I (Wetland 3136) 3112 (Wetland 3142) 3114" (Wetland 3150) 3115 P:LC.APA Collect. Point 19 18 Project Description Secure easements to Otltlct to Francis Lake and 1100' of channel frol11 lake to SE 184tll St. Construct a weir to raise lake level 1', and enhance 1100' of Trih. 0317. Should be j\1Stificd by n basin plan. Wetland rated # I. (This wetland will require fmtller biological cva[wltion before RID ucsign anu l:onstruction.) Secur!.; ca,9.::mcnt for outlet to wetland and replace existing weir with a concrete-slotted weir. Should be justified by a hflsin plan. Wetland rated #2. (This wetland will require further biological evaluation before RID design and construction. Secure casement to Wetland 3150 and construct a containment berm and conlrol structure at the outlet. Project should be j\1Stified by a basin plan. Wetland rated #2. (This wetland will require further hiological cV~llu.ation hdon: RID design and construciton.) Install detention pond and 1,000' of tight line, Project is indepen- dently justifiable. Problem Addressed Will provide additional storage to mitigatl! anticipatl!d future increased flows. Will provide additional storage for anticipated future peak flows. Addresses anticiputcd increases in flow caused by dl:vclopment. Mitigates severe erosion and flooding during times of high flows. A-2 Estimated Costs and Comlllents S175,000 $117,000 $134,000 $361,000 Project Number 3 IIA 3117 31lR 3119 3120 P:LC.APA Cellect. Peint 21 16 JO 4 15 Project Description Rnise existing road cmbnnkment 2·4'. PrDject sheuld be indepen. dently justifiahle. (Refer to. Reads DivisiDn.) Install 1,400' Df tightline, a sediment trup, and 700' Df channel frDI11 JDnes Rd. to. Cedar River. Project is independently justi. fiable. Install 300' Df 36" culvert, a new inlet stnlcturc, manhole, and catch basin. Preject is independently justifiable. Construct (I detention dam and control structure in a deep channelized section of Trib. 0300. PrDject is independently justifiahle. ConS(l1.lct a sedimentation pond and 1,000' ef channel from Jones Rd. to Ceullr River. Project is indepen' dently justifiable. Prohlem Addressed Mitigates seasonal flooding of Lake Desire Dr. SE caused by road bed settling in the peat bog. Mitigates severe erosion, sediments deposited on County roads, and flooding during times of high flows. Will prevent l,lockage of culvert and the accompunying nooding and erosion of Faitwood Golf Course and mobile home park I'elow. Project location is ideal because it addresses flows frDm a large resident inl area before they rench the steep, sensilive area next to the Cedar River. Mitigales flooding of residence and sediment deposition on Jones Rd. A·3 Estimated Costs and Comments $73,000 $501,000 $87,000 $159,000 $163,000 Project Number 3121 (Wetl<lnd 3102) 3122 P:LC.APA Collect. Point 7 II Proi~ct Description Secure easement to wetland and con- struct a conlninl11cnt herm nnd concrete weir at outlet. Project should be j\.Isti(icd by a basin plan. Wetland rated #2. Uiological as,sessmcnt is needed to assure that this project does not decrease habitat values. Purcl,ase eXisting ponds on Fnirvmod Golf COllrse and expand to provide greater flow detention. Pro.jeet is independently justifiable. Problem Adurcssed Addresses increased flows in Trib. 0304 onu 0304A from resiucntiol developments. Mitigotes flooding and erosion downstream. A-4 Estimated Costs and Comments $371,000 $342,000 APPENDIX B CAPITAL IMPROVEMENT PROJECT RANKING LOWER CEDAR RIVER BASIN Prior to the Lower Cedar River Basin field reconnaissance, 12 projects had been identified and rated using the CIP selection criteria developed by the Surface Water Management (SWM) and Natural Resources and Parks Divisions. FolIOY.ing the reconnaissance, 13 projects remain proposed for this area. They include eight new, previously unidentified and unrated projects. These displace seven previously selected projects., which were eliminated based on the consensus of the recon- naissance team. Projects were eliminated for severa) reasons: m"o sites were annexed by the city of Renton, two projects were found to be unnecessary, two sites were categorized as #1 wetlands (and arc' ineligible), and one project was detennined to be infeasible. The previous SWM capital improvement project list for the Lower Cedar River Basin had an esti- mated cost of $2,710,000, while the revised list increases to an estimated coost of S2,784,000. This 3 percent increase in estimated capital costs is due to the addition of projects after the reconnaissance. The following table summarizes the scores and costs for the CIPs proposed for the Lower Cedar River Basin. These projects were rated according to previOUSly established SWM Program Citizen Advisory Committee criteria. The projects ranked below are those for which the first rating question, ELEMENT 1: "GO/NO GO: could be answered affirmatively. Projects v.ith scores of 100 or higher can be considered now for merging into the "live" elr Jist. RANK PROJECT NO. SCORE COST --- I 3122 103 $342,000 2 3]]8 90 87,000 3 3120 75 163,000 4 3109' 67 186,000 5 3121 65 371,000 6 3Il7 60 501,000 7 3]]5 60 361,000 8 3Il6 55 73,000 9 3114* 28 134,000 JO 3Ill' 25 175,000 11 3Il2" 17 117,000 12 3]]9" 15 159,000 13 3105 12 Il5.000 TOTAL $2,784,000 " Projects proposed prior to the Reconnaissance Program P:LC.APB B-1 • AU items listed here are located on final display maps APPENDIX C DETAILED FINDINGS AND RECOMMENDATIONS LOWER CEDAR RIVER BASIN in the OUices of Surface Water Management, BUilding and Land Development, and Basin Planning. Trib. & Collect. Existing Anticipated Item' River Mile PoinL Catej;ory Prop. Proi. Conditions and Problems Conditions and Problems 1 5 Geology Gullying and landslides in Continued erosion. uncompacted fill in new development near edge of steep hillslope. 2 18 Geology Small landslide has formed None (natural failure). debris flow (11/86). Sedimentation in yard of residence. 3 0299 4 Geology Landslides in sedimentary Natural failure. RM 2.6 rock in cutbanks adjacent to railroad. 4 0299 16 Geology Drainage from residential Increasing erosion. RM 9.65 area is resulting in gullying in swale. P: LC.APC C-1 Recommendations Recompact fill, revegetate, and drain adequately. None. None. Provide adequate RID to attenuate flows. Trib, & Collect. Item River Mile Point 5 6 7 8 9 0299 RM 12.1 P: LC.APC 18 13 7 2 14 Category Prop. Proj. Geology Geology Geology Geology Geology Existing Conditions and Problems Horse farm in uplands has created extensive imper- vious surfaces, resulting in channel SCOUT, bank erosion, landslides, and sedimentation at mouth of basin. Residence overCOme with sediment. Landslide terrain for sale by realtors. High risk for landslides, flooding (from springs). Large-scale landsides adjacent to Cedar River due to springs and cutting of toeslopes by streams. Appears to be natural. Gullying in valley wall, possibly from natural springs. Landslide debris flow from residence on SE 147th PI., Renton. C-2 Anticipated Conditions and Problems Continued high erosion and sedimentation. Site of fmure mass erosion. Natural process. Unknown. Existing tension cracks indicate future instability. Recommendations Develop RID at horse farm to attenuate peak flows. See Project 3115. Prohibit development here. Notify Building and Land Development. Add area to SAMF. None. None. Revegetate hillslope with trees and shrubs. Item 10 11 12 13 14 15 Trib. & Collect. River Mile Point 0299.1A RM .08 0300 RM .00-.40 0300 0300 RM 1.40 0302 RM .50 21 4 4 4 6 0302 6 RM .80-1.00 P: LC.APC Category Hydrology Geology Hydrology Hydrology Geology Geology Prop. Proi. 3116 3119 3109 Existing Conditions and Problems Frequent flooding of county road caused by low road embankment. Extensive channel and bank erosion and numerous landslides due to development-related stormwater. Development-related peak flows have caused sig- nificant bank erosion. Collection point 4 has been nearly completely urbanized. Channel downcutting and bank erosion. Bank erosion (medium den- sity) at meanders and obstructions. C-3 Anticipated Conditions and Problems Road located on top of peat bog and will continue to settle, aggravating flooding problem. Problems will continue. Increased erosion on hillslopes below. Degradation of Trib. 0300 from RM .42 downstream. This section is very' steep and susceptible to erosion. Will continue at same level or increase. Increasing erosion with increasing flow from devel- opments. Recommendations Elevate the road 3-4' by filling on top of the present road embankment. Also stabilize embankment. Provide adequate RID in uplands. (See Project 3119.) Construct detention dam in deep, channelized reach of Trib. 0300. Construct berm and standard control structure at outlet to Wetland 3120 in Cascade Park. Control storm flows from uplands. Provide adequate RID in uplands as area develops. Trib. & Collect. Item River Mile Point 16 17 18 19 20 21 0~02 0302 RM .60-.80 0302 RM.35 0302 RM .45 0302 RM .50 0302 RM .90 !': LCAPC 6 6 6 6 6 6 Existing Category Prop. !'roj. Condilions and Problems Geology Geology Habitat Hydrology Habitat Habilat Gully erosion from broken culverts. Severe gully erosion creating small valleys from daylight culverts. Stream channeled along golf course road. No overhead cover. No habi- tat diversity. Tributary drains down steep bluffs on north side of Cedar River, carrying debris and flooding Maplewood Golf Course. Water supply dam. Full barier to upstream migrnlion. Impoundment is filling with sediment. Severe gullying from right bank carre gated metal pipe. Heavy sediment delivery 10 stream. C-4 Anlicipaled Condilions and Problems None. Culverl has been repaired. Continued erosion. While fish now use this reach, lack of habitat will eventually reduce popula- tions. Problem will worsen as development upstream continues. As impoundment fills, storm- water will flood over bank. Stnlcturc may fail. Will continue to erode until reaches till layer. Recommendations None. Tightline flows to main stem. Add habitat diversity (e.g., structures, overhead vegetation). Gain' easement to restore mean~ ders, if possible. Construct detention dam upstream of golf course. Dredge pond and maintain it as sediment catch. Tightline downslope. Add velocity attenuator at slream. Trib. & Collect. Item River Mile Point 22 23 24 25 26 0302 RM 1.00 0302 RM 1.10 0303 0303 RM .25 0303 RM .35 P: LC.APC 6 6 6 6 6 Existing Category Prop. Proj. Conditions and Problems Habitat Habitat Geology Habitat Habitat Trash in stream (auto, tires, appliances). Trash in stream, Water quality problem, unsightly. Extensive bank erosion in upper portions of tribu- tary. Habitat suitable for resi- dent fish. Sediment accu- mulating. Trash and litter in channel affecting water quality, causing erosion. C-s Anticipated Conditions and Problems Area adjacent to corridor, will continue to collect trash and debris. Further worsening of water quality, sedimentation, erosion. Area adjacent to corridor, will continue to collect trash and debris. Further worsening of water quality. None. Sediments will eventually cover gravels. Habitat will become unsuitable for fish use. Further decreases in water quality. Recommendations Remove trash. Distribute educational materials to streamside residents. Cite violators, if problem persists. Remove trash. Distribute educational materials to streamside residents. Cite violators, if problem persists. Increase RID volumes, slow release rate to nonerosive levels. Control stormwater volumes and discharge rates from developments. Manually clean gravels when necessary. Remove trash and litter. Distribute educational materials to streamside residents. Cite violators, if problem persists. Trib. & Collect. Item River Mile Point 27 28 29 30 31 0304 RM .40 0304 RM 2.10 0304 RM 2.30 0304 RM 2.40 0304 RM .80 P: LC.APC 7 8 8 8 7 Existing Category Prop. Proj. Conditions ~nd Problems Habitat Habitat Hydrology H"bitat Geology L~ndslides contributing sediment to channel. Heavy deposition in pools, at obstructions, even in riffles. Horses have access to stream, causing some hank deterioration and possibly affecting water q\latity. Flooding caused by failing RID at 176th St. & 146th Ave SE. Encroachment occurring along all boundaries of this headwater wetland. Several gullies due to daylight CUlverts; a few have recent landslides. C-6 Anticipated Conditions and Problems Sediment will continue to enter system until landslide stabilizes. Further decreases in water quality, b~nk erosion likely. Problem will continue until outlet structure is modified. Wetland likety to be reduced slowly until it is completely destroyed. Loss of storage, filtration, organic production, and wildlife habitat. Problem will continue. Recommendations Maintain riparian corridor with setbacks at least 50' from tops of banks. Encourage residents to fence channel back 15' from ordinary high-water mark. Limit access to livestock to one or two points along stream. Problem referred to Main- tenance section of Surface Water Management Division. Require encroaching fills to be removed. Establish specific buffer around this wetland. Enforce sensitive areas ordinances and regula- tions. Tightline drainage. Trib. & Collect. Item River Mile Point :12 33 34 36 37 0304 RM .00 0304 RM .20 0304 RM .62 0304 RM .80 0304A RM 1.30 P: LC.APC 7 7 7 7 7 Cntcgorv Prop. Proj. Habitat Habitat Habitat Habitat Hydrology 3102 Existing Conditions and Problems Extensive riffle (to RM .15. Creek channeled. No woody debris, little bank vegetation. Steel head, coho spawners here. Debris jam may be a partial migration barrier. Debris jam. Bed drops 3' over jam and sediment, forming anadromous barrier. Water turbid; oily sheen and odor present. Storm drains empty directly into stream. Existing forested wetland provides detention for Trib. 0304A and 0304 in heavily developed area. C-7 Anticipated Conditions and Problems Gravels risk becoming cemented. Few resting areas for upstream migrating fish. Debris will continue to accumulate. Channel will likely divert or jam will fail, releasing accumulated sediment. Debris will continue to accumulate. Channel will likely divert Or jam will fail, releasing accumulated sediment. Water quality will continue to decline as runoff and waste enter stream, Additional storage could be utilized by constructing berm and weir at outlet. This could be done to atten· uate increased peak flows as upstream area develops. Recommendations Enhance habitat by addi· tion of woody debris in stream. Revegetate bank. Enhance pool/riffle ratio. Selectively remove debris to allow fish pass<1ge. Stabilize large woody debris. Selectively remove debris to allow fish passage. Stabilize large woody debris, Educate residents about how to maintain water quality. Mark storm drains with "Dump no oil" signs. Emphasize recycling of oil. Construct a proportional weir and berm at wetland outlet. Project could be used instead of Project 3107 to rpeserve the #1 rated wetland (where project would be built). Trib. & Collect. Existing Anticipated Item River M'ile Point Cate~ory Prop. Proj. Conditions and Prohlems Conditions and Problems Recommendations 38 0304A 18 Hydrology 3115 Runoff generated on top of Flooding will continue as Construct detention pond RM .40 bluffs On southwest side long as Innd use remains the at top of bluffs. of Cedar River is causing same on top of bluffs or Tightiine drainage down severe bank erosion, until mitigating measures bluffs, then channelize it flooding and debris flows are taken, Runoff origin-to an existing ditch onto several residences ates from highly compacted alongside SR 169. of valley floor. pastureland on uplands. Prevent similar problems elsewhere with land use regulations, including provisions for preservation of vegetation buffers near tops of cliffs. 39 0305 10 Geology Extensive bank erosion, Susceptible to increases Attenuate high flows. partly due to subsurface with increasing storm flow. clay layer and landslide topography. 40 0305 10 Geology Local severe bank Problem will continue. Existing rock-filled RM 1.10 erosion. gabions are deflecting flow. 41 0305 10 Geology Extensive channel down-Continued erosion. Attenuate high flows with RM 2.10-cutting and bank erosion. adequate RID. (RID 1.75 currently exists.) 42 0305 10 Geology Several gullies and a5.",-Erosion will continue. Tightline culverts. RM 2.15-cia ted landslides due to 1.75 daylight culverts on steep slopes adjacent to chan· nels. P: LC.APC C·g Trib. & Collect. Existing Anticipated [tem River Mile Point Category Prop. Proj. Condition:r-; and Problems Conditions and Problems Recommendations 43 ~ 10 Hahitat Madsen Creek in ditch along Potential for fuel entry in-Acquire 30' easement away RM .20 SE Jones Rd. Heavy silt; to creek. Further decreases from roadside. Construct road runoff; water quality in water quality can be ex-new stream channel. adversely affected. pected. 44 0305 10 Habitat Creek in ditch along south Further decreases in water Acquire 30' easement away RM .35 side of SR 169. Heavy quality can be expected. from roadside. Const ruct inputs of oils, anti-Potential for autos to enter new stream channel. freezes, heavy metals, channel. L1ck of habitat. organic pollutants likely. Sand, silt from roadside (of SR 169) enters also. 45 0305 RM .00-10 Hydrology 3105 Section of Trib. 0305, Flooding will continue. Construct and enhance 2200' of .40 RM .00-040 is experiencing (See Appendix A, Project channel through undeveloped extensive flooding. 3105.) King County Park Land. 46 0305 10 Habitat Channelized along dri-Further siltation, water Acquire easement; move RM .50 veway; lacks hahitat quality degradation can be creek from driveway diversity. Driveway sedi-anticipated. Lack of habitat 10-15'. Add meanders and ments enter channel, and precludes optimum salmonid habitat structures to oil. placed on driveway use. increase diversity. enters stream. 47 ~ 10 Habitat Channelized tributary Little s.1lmonid use Add structures to incrense RM .65 lacks hahitat diversity, anticipated. Spawning and diversity in stream. cover for salmonids. rearing success limited Manually clean gravels by Gravels compacted. (unless reach is restored). churning them. P: LC.APC C-9 Trill. & Collect. Item River Mile Point 48 49 50 51 52 0305 RM .90 0305 RM .95 QW RM 1.20 m05 RM 1.70 0306 RM .40 P: LC.APC 10 10 10 10 !O Category Hubitat Hahitat Habitat Habitat Geology Prop. Proj. Existing Conditions and Prol'lems Good spawning riffles OCcur here. V2·3" gravels, few fines, not compact. High flows arc moving. material, however. Severe bank cutting and erosion occurs here. ned scouring evident. Reach sul'ject to high, rapid flows. Much woody dellris movement and numerous debris jams. Reach is subject to high, rapid flows. Channel erosion, bank failures, downcutting OC~ curring. Reach subject to high, rapid flows. Failure of manhole during 11/86 storm has resulted in gully erosion. C·l0 Anticipated Conditions and Problems Increased flows may cause gravel bar movement. Suitable gravels may be transporled downslream to unusuhle areas for spawning salmonids. Further erosion/scouring can be expected. Channel deterioration will continue. Flows appear to he generated al developments. Debris jams will occur with grealer frequency as flows increase. Sediments will build up and channel will divert. Further channel deteriora· tion may be expected, Silt, sand transport to mainstem will increase. Not applicahle. Recommendations Control flows into system from developed areas upstream. If necessary, add bed controls to hold gravels or "vee ft struc- tures to recruit them. Control high flows by increasing upper basin RID facilities, lowering discharge rates to stream. Control upstream flows with greater R/D volume, lower dis<:harge rates. Selectively remove debris, Increase RID capacity. Decrease discharge rates. Repair manhole. Item 53 54 55 56 57 58 Trib. & Collect. River Mile Point 0306 RM .20 0306 RM .30 0306 RM .25 0306 RM .30-.45 0306 RM .30 0306A RM 1.30 10 10 11 10 II P: LC.APC Category Prop. Proj. Geology Geology Habitat Geology HydrOlOgy 3118 Hydrology 3122 Existing Conditions and Problems Channel downcutting, bank erosion and several landslides, due both from increased storm flows and development along edge. Undersized culvert in arti· ficial fill in golf COurse threatens to build lake and possibly overtop bank. Breach flood possible. Channel SUbject to high, damaging flows. Erosion evident. Downcutting, bank erosion and landslides. Trib. 0306 connects with large tributary at manhole here. Del"is from 0306 clogs (his manhole, causing severe erosion of Fairwood Golf Course. Existing small ponds on 0306A are overtopped and receive considerable silt during high flows. The ponds are located on Fairwood Golf Course. C·]] Anticipated Conditions and Problems Erosion will increase. Clay layer in valley makes area sensitive to landslides. Possible fill failure: Lake ponded behind culvert in in 1981 and threatened the fill. Further channel damage can be expected. Sediment transport downstream will continue, Will continue or increase in future. Problem will worsen as development upstream continllc~. Area upstream is developing quickly, thus worsening the problem. Recommendations Further increase in runoff should be attenuated; this is a sensitive channel. Enlarge the corregated metal pipe and lor construct adequate trash rack. Increase RID capacity, decrease discharge rate. Attenuate storm flows. Replace existing pipes with larger diameter pipes (if downstream analysis allows for increased flows). Install new inlet struc· tures with trash racks. Acquire easements for ponds and additional area around ponds and construct detention pond. Location is ideal for addressomg peak flows before they reach the sensitive Cedar Reiver bluffs. Tri!>. 8: Collect, Item River Mile Point 59 60 61 62 6:1 0:10GA 11 RM .25 0:107 12 RM .10·.40 0307 RM ,10·.60 0307 RM .30 m07 RM ,(,0 12 12 1:1 P: LC.APC Existing Cotegorv Prop. Proj. Conditions and Problems Habitat Geology Geology Habitat Hydrology Some usable habitat exists for resident salmon ids. Water quality is poor. Channel SUbject to high flows. Extensive bank erosion at all meanders and obstruc· tions (trees, cars) due to inc"eased flows from development. Stream eroding toes of slopes resulting in landslide failures. Stream channel pushed to one side of ravine for roadway. High energy system. Much bnnk cutting, sediment transport, debris movement. Area on top of hluffs neor Trib. 0307 has excellent infiltrative capacity. C·12 Anticipated Conditions and Problems Further habitat deterioration likely. Ownnel erosion will increase. Increased erosion will result with increased flows. Increasing erosion with increasing flows. Erosion will worsen as stream flows increase. May threaten road bank at toe of slope, Infiltration sites should be used whenever possible. These would provide ground. water recharge. Recommendations Increase RID capacities. Decrease discharge rates, Encourage use of 2·eell detention ponds, swales. Prohibit filling of existing wetlandS, ponds in upper basin. Mitigate development· related high flows. Provide adequate RID. Mitigate development related high flows. Provide adequate RID. Increase RID capacity at all delivery points. Reduce release rate below channel scour level. Construct retention facio lities for new develop· ments in area at these sites. Trib. & Collect. Existing Anticipated Item River Mile Point Category Prop. Proi. Conditions and Problems Conditions and Problems Recommendations 64 0309 15 Habitat Subject to heavy, rapid Erosion, deposition will -Control storm flows RM .10 flows. Channel erosion, increase. Sediments will upstream. deposition bars migration. migrate downstream, creating Control volume and discharge a water quality problem. rates, 65 0310 15 Geology Sedimentation upstream from Continued sedimentation. See "Hydrologic and hydraulic RM .60 culvert due to debris and characteristics" section in undersized culvert. New this report. corregated metal pipe con- tinues to pass water through. 66 0310 15 Geology Severe erosion below Continued erosion and -Install energy dissipator RM .05 culvert, severe sedimcn~ sedimentation. below corregated metal pipe. tation in residence yard. Excavate channel through yard where original channel was located. 67 mID 15 Geology Road drainage forming gully Continued erosion. Reroute drainage. Refer problem RM 1.50 adjacent to road; road bed to Roads Maintenance. in danger. 68 0310 15 Habitat 3120 Corregated metal pipe is Problem will continue. Reinstall corregated metal RM .25 anadromous barrier. pipe at or below bed level. P: LC.APC C-D Tril,. & Collect. Itel" River Mile Point 69 70 71 72 73 0310 RM .40 0310 RM .60 0311 RM 1.70 0314A RM .20 0314AI 0314D RM .10-.40 P: LC.APC 15 15 13 16 16 Existing Category Prop. Proj. Conditions and Prohlems Ilydrology 3120 Habitat Geology Hydrology 3117 Geology Existing channel draining off bluffs on north side of Cedar River, causing flooding of residences and debris flows onto Jones Rd. during peak flows. Corregated metal pipe outlet approximately 9' above bed level. Complete barrier to fish. Old culverts at bed level are plugged. Gully erosion in drainage swale due (0 outflow of wetland that partly seems to act as an RID facility. Severe erosion, flooding, damage to County and private roads from increased nlnoff from gravel pit operations on hillside. Inadequate RID, plugged culvert caused by exten- sive channel and bank erosion and landslides. Water has cut a new channel. C-14 Anticipated Conditions and Problems Frequency and severity of problem wi!! worsen as development on bluffs increases. Problems will continue and worsen as outfall velocities will scour bed and banks. Upstream has recent (11/86) deposition up to 4' deep. Continued accelerated ero- sion. Problem will be aggravated as tlreu above develops. Not applicable. Recommendations Construct detention pond on upstream side of Jones Rd. to trap sediments, and enhance 1,000' of creek from Jones Rd. to Cedar River. Remove new and old pi pes; replace at lower level with oversized pipe with trash rack. If possible, enlarge RID prior to its outlet in the wetland. -Tightline drainage between detention ponds in gravel pit. Construct detention pond next to Jones Rd. to trap sediments. Constnlct channel from Jones Rd. to Cedar River. See hydrology comment above. Trib. & Collect. Item RivCl' Mile Point 74 0317 RM 1.00 75 0320 76 77 RM 2.40 Ql!.!! RM.lO 0382 RM .35 P: LCAPC 19 19 Existing Cntegory Prop. Proj. Condit ions nnd Prohlems Hydrology 3111 Francis L1ke is only hydraulic control for Trib. 0317. Hydrology 3114 Existing forested wetland with large amount of un~ utilized storage. Wetland currently dctnins flows on Trib. 0320. lInbitat Habitat Snlmonid parr in many pools. L1rge pools up to 1.75' deep. Some deposi. tion in pools, behind obstmctions. Salmonid use apparent from carcasses, Sockeye, Chinook spawners. Some sedimentation occurring. C-15 Anticipated Conditions and Problems Trib. 0317 flows through steep area downstream of lake. If area around Francis L1ke develops, increased peak flows could cause severe damage to Trib. 0317 in the steep region. If surrounding area urbnn- izes, this would be a good site to attenuate peak flows. Decrease in water quality with increasing develop- ment. Loss of habitat. Decrease in fish use. System is mostly in naturnl condition. As development increases, higher flows and worse water quality can be expected. Recommendations Construct proportional weir at outlet. Enhance 1,100' from Francis Lake to SE 184th St. Constnlct containment berm and control structure at outlet of wetland (if bio- logical analysis permits). Establish and maintain adequate buffers, 100' from ordinary high.water mark or 25' from top fo slope break, whichever is greater. Maintain adequate stream corridor buffers. Reduce discharge rates to pre.development levels. Prevent clearing, grading within buffers. Trib. & Collect. Existing Anticipated Item River Mile Point entegg)"'y Prop. Proj. Conditions and Problems Conditions and Problems Recommendations 78 ~ 19 Geology Medium-density landslides None. Limit development in the RM .50 and hig,h·density bank basin. erosion occurring due to natural causes. This indi- cates channel and valley sensitive to effects of development. (Sensitivity due to Clay layer. Basin hosts some of best fish habitat in upper reaches.) 79 0328 19 Habitat Significant salmonid usc Sedimentation from upstream Maintain leave strips RM .70 throughout. Sockeye reach possible. Adjacent adjacent to stream at spawncffit carcasses present. development will likely least 100' from ordinary Coho, steelhead parr in reduce diversity and quality high-water mark. Restrict pools. Excellent habitat of habitat. use/development within this for spawning and rearing streamside management zone, (a redd site). Much diversity --most exemplary in basin. Channelized reach, Uniform May cause thermal problems Restore stream habitat 80 0328 19 Hanitat channell no habitat diver-as water temperatures rise. throughout: add structure, RM 1.10 sity. Heavy sand deposition. No \Ise fll I hahitat. diversity, bank vegetation, lAO Little overhead canopy or and canopy. Cost should be bank vegetation. borne by party(ies) who channelized this reach. 81 0328 19 Hydrology 3112 Lake Peterson is small, Lake provides good peak flow Replace weir at outlet RM lAO open.water wetlam1 with a attenuation and will become with a higher weir in weir at outlet. morc important as upstream order to gain additional tributary area develops. storage. P: LC.APC C-16 TASK 3 FIELD INSPECTION EXHIBIT J Off-Site Analysis Drainage System Table Basin: Cedar River Drainage Component Symbol Type, Name, and Size Type: sheet flow, 5wale, stream. channel. pipe. pond: size. Sec Map diameter, surface area 1. Sheetflow off south property line through forested area 2. Seasonal stream 3. Dispersed flow through thick brush and blackberries 4. Rockery wall 5. Broad channel may be detention pond 6. 18-inch CMP 7. 18-inch CMP 8. 18-inch CMP 9. IS-inch CMP 10. 18-inch CMP 11. 18-inch CMP 12. 18-inch CMP OFF-SITE ANALYSIS DRAINAGE SYSTEM TABLE Surface Water Design Manual, Core Requirement #2 Subbasin Name: _________ _ Distance Drainage Component from Site Existing Potential Description Slope Discharge Problems Problems Constrictions. under capacity, ponding, overtopping, flooding, habitat or organism Drainage basin. vegetation. cover, destruction, scouring. bank sloughing, depth. type of sensitive area, volume % Fe sedimentation. incision, other erosion Discharges to seasonal stream 5.15 0-660 None Noted None Noted 2-foot bottom, 2 feet deep, 1: 1 1-2 660 -1,060 None Noted None Noted side slopes Courses south 2 1,060-1,260 None Noted None Noted Covered by blackberries -1,260 -1,265 None Noted None Noted Grass lined, 40-by l70-feet 1 1,265 -1,435 None Noted None Noted Flows south from channel to I 1,435 -1,450 None Noted None Noted catch basin Flows south from catch basin 1 1,450 -1,490 None Noted None Noted to catch basin on south side of S.E. 144th Street Flows west from catch basin to 1 1,490 -1,612 None Noted None Noted catch basin Flows west from catch basin to 1 1,612 -1,928 None Noted None Noted catch basin Flows west from catch basin to 1 1,928 -2,134 None Noted None Noted catch basin Flows west across 1 2,134 -2,174 None Noted None Noted 160th Avenue S.E. Flows west from catch basin to 1 2,174 -2,304 None Noted None Noted catch basin Subbasin Number: ___ _ Observations of Field Inspector,' Resource Reviewer, or Resident Tributary area, likelihood of problem, overflow pathways, potential impacts 11778.003.doc Basin: Cedar River Subbasin Name: __________ _ Subbasin Number: ___ _ ~- Distance Observations of Field Inspector, Drainage Component Drainage Component from Site Existing Potential Resource Reviewer, or Symbol Type, Name, and Size Description Slope Discharge Problems Problems Resident Constrictions, under capacity, p~nding. Type: sheet flow, swale. stream, overtopping, flooding. habitat or organism channel. pipe, pond; size, Drainage basin, vegetation, cover, destruction, scouring, bank Sloughing. Tributary area, llkelihood of problem, See Map diameter. surface area depth, type of sensitive area, volume % Ft. sedimentation, incision, other erosion overflow pathways, potential impacts 13. 18-inch eMP Flows west from catch basin to 1 2,304 -2,458 None Noted None Noted catch basin 14. 18-inch CMP Flows west catch basin to catch 1 2,458 -2,632 None Noted None Noted basin ~ 11778.003.doc TASK 3 FIELD INSPECTION There were no problems observed during the resource review. Based on a review of the drainage complaints of the downstream drainage course. there were no existing constrictions or lack of capacity in the existing drainage system. 3.1 Conveyance System Nuisance Problems (Type 1) Conveyance system nuisance problems, in general, are defined as any eXlstmg or predicted flooding or erosion that does not constitute a severe flooding or erosion problem. Conveyance system nuisance problems are defined as flooding or erosion that results in the overflow of the constructed conveyance system for runoff events less than or equal to a IO-year event. Examples include inundation of a shoulder or lane of a roadway. Overflows collecting in yards or pastures, shallow flows across driveways, minor flooding in crawlspaces or unheated garages/outbuildings and minor erosion. Based on a review of the drainage complaints, there were no complaints associated with the downstream drainage course for this project site. However, there were complaints located on both sides of the downstream drainage course, to which this project site may contribute some runoff to under existing conditions; however, it was not likely. With the improvements of this project site, there is the potential that problems on both sides of the downstream drainage course may be helped somewhat by mitigating problems associated with those drainage complaints. 3.2 Severe Erosion Problems (Type 2) Severe erosion problems are defined as downstream channels, ravines, or slopes with evidence of or potential for erosion/incision, sufficient to pose a sedimentation hazard to downstream conveyance systems or propose a landslide hazard by undercutting adjacent slopes. Severe erosion problems do not include roadway or minor ditch erosion. The sensitive areas folios indicated there were no erosion/sensitive areas in the downstream drainage course of the project site nor did the site visit find erosion problems evident anywhere along the downstream drainage course. 3.3 Severe Flooding Problems (Type 3) Severe flooding problems can be caused by conveyance system overflows or the elevated water surfaces of ponds, lakes, wetlands, or closed depressions. Severe flooding problems warrant additional attention because they pose a significant threat either to health and safety or to public or private property. Neither the review of the drainage complaints nor the site visit noted any severe flooding problems in the downstream drainage course. Portions of the downstream drainage course investigated by the site visit and a review of the soils map indicates that the downstream drainage course occurs through till type soils. The field reconnaissance for this off-site analysis drainage report was conducted on the morning of October 27, 2005. The skies were partially overcast and the high temperature on this day was approximately 55 degrees. I I 778.003.doc TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS TASK 4 DRAINAGE SYSTEM DESCRIPTION AND PROBLEM DESCRIPTIONS Runoff leaves the site by discharging off the southern property line of the site where it courses through thickly forested areas with alternating trails for access to different portions of the site, and tends to sheetflow through forested areas into a seasonal stream that courses south and southwest into a blackberry bush area, ultimately discharging to a large channel, which may be a detention pond, adjacent to S.E. 144th Street, then flows are collected in an 18-inch CMP and catch basin pipe conveyance system, where it is coursed along the southern side of S,B. 144th Street for several thousand feet in a westerly direction until over O.5-mile from the project site where the off-site analysis was terminated. The drainage complaints are located on the following pages of this report; however, none of them were located on the downstream drainage course followed for this project site. They were placed into this report for reference only and, therefore, there are no anticipated problems associated with the development of this project site. 11778.003.doc EXHIBITK Drainage Complaints NOV. 3.2005 8:30AM KING CO. WLRD NO. 5845 P. 1 FilE COpy King County Water and Land Resources (WLR) Division 201 S Jackson St, Suite 600 Seattle, WA 98104-3855 FAX To: 0duj{J/dJ Pax: 1"3-$1-.f7'a'il Phone: ________________ _ Date: Number of pages including cover sheet ..fL From: Candi McKay. Eng Tech IT WLR Stormwater Services Section Phone: 206-296-1900 Fax Number: 206-296-0192 IMPORTANT LEVEL 1 ANALYSIS NOTE: We do not send copies of certain complaint types that are not relevant such as BCW, FI, FIR, FIH and WQA, and we do not send CL and LS types. See key below. Type S 1, S2 and S3 will not be faxed due to size constraints. The following is a list of complaint types received by the Water and Land Resources Division Drainage Services Section. Complaint numbers beginning prior to 1990-XXXX have been archived and are no longer in our possession. They can still be retrieved, if necessary, but will take additional·time and may Dol be beneficial to your research due to their age, development which has occurred, etc. If you are interested in reviewing the actual complaints, they can be pulled (time permitting) for your review. Copies can be obtained for $ .15 per page, and $2.00 per page for plans. Keys: • Type or Inyqt! .... tlon . c Ac~OD Request BCW BusintsS'~fgrCl~ Wa1L7 CCF lWponsc to In<jUlly "CL Claim ElI Bnf~t on Hold ER BnfOlWOlePt. Review 1'CC,FCR,l'CS Facility ComplaiolB Fl SWM Pu l"nq1>iIy FJR. SWM Fee Review . FDl SWM FeeOD Hold. .. LS Law.mll: RR Facility Fl'IgJneedng Review NDA Ncigbbo<hood Dtatllage AWstonoo WQt:: W_ QwdiI;y Compw", WQE W.terQwdil;yBnfo"""",,,' WQR Water Qualily IlngioeetinE Review· WQA Water Quality Audit WQO W_Quality-Otber SI,si,sNJ FJtgineerlng S."Il.,. Type of Problem DCA VDM DRS DLE DTA INQ MMA MMF MMO MMM MNM MNW SWF WQB WQD WQI REM GRT NWD Deve1opmentJConslrUcaon Drainage -Miscellaneous DnliMge -F.rosiOlll:ledimcutauOP . Dtalnage -LandslidelBanh MovCJDmt Drainage Technlcal AssistllDce Qmloase -Geaer.al Inqnlry Maiu_-Aeslhetia Main_-Flooding Maintc:lUlIlCC -General Maintawlce -MowmS Main!<",IIC" -N=18 Main-= Maintenance-NQXious W~ SWM Fee QuostiODS W_ Quality -Best Manag ....... P=<i= W_ Quallty -VumplDg Water QtWity -l!Ilcil Conne<ticn SWM Fee -Re.measu.remelIt SWM F<e-OtInt SWM 1'<6-New DIscount ·Sob}"" to l'Ubu" Dlsol"""" n:qoi"",""," 1.l!=ipt <it..,;1tcn n:qoest Co< doaImeDts 2. RoYj"" and IIPl'fO"al by 1'roseeu6ng AttruneT> office I • COMPLAINT INVESTIGATION REPORT L~~~n~O~N~: __ ~~~~~~~~~~ ________________________ ISEC ~:1l~E ~ ;;.. KROLL PG. I ::OMPLAINANT: _~~t4&:~I;;:;2~(l:l;.~~~Z1L __________ ICOUNCIL DIST • . ~ PtfOfIIIE NO. '/ /NR /J •. , HOME: ___ _ o.ddress (p 7' ~, u/M State Zip WORK: lETAILS OF COMPLAINT, Ad ~ ~ fo 5tfJIIIF/If ~ c2/S-ft/. COMI'tAINT RECEIVED BY: ETAILS OF INVESTIGATION: Sketch,on reverse side: Yes "" No 0 Photos: YesCl __ No 0 " rt i"""\CMm.ily O,v S~ Z."&7-11. !)rrCNcS ON ~T/<IS""llJE OF S~ ~e6",u e:.vcGoJ{30 '/2.--'1 CM", STI.4?ReO OVI 7"0 ~..rr /7-00 12.-N. cP P4J~O -1(;-O-',vST 1T..<7$ 5//6!:u1\...ol IV /1 Te?<:A IvA7r?..s ~-r c.P' ;lJ~(/ec.v"lI/ AT 16<l/0> PJ.Jo7D @ ,J/(j(,J..i" .t<J POS<;/IJ(.1; i3X.C:.. 1vfe.tp ?vl./ICI.! _y J;e 7iiJ1:;-e"VT uJi.L/5 To 7"l./iS Ev/tJ =-,C" p//c--va C..-cJ~ ,&jSl-v oZ>,E,evEO l.-v T-'1'IS UJcA7folV 7'"0 ~~/'VA7'& P;t"'E ;ZUI./~ )MPLAINT INVESi!GATED BY, "mON TAKEN: /£// ~ 11·21'1<" ~~ lmplainant advised of action possible or taken by: Phone 0 letter 0 Personal Contact 0 ~omplaintA~ion Handled By ~..s :::bHAfi'aW Closed: DATE: z--Z5t-cr f OK'd: __ _ NOV, 3. 2005 8:31AM KING CO, WLRD NO, 5845 p, 3 TO F ~~~N. ---~~=~~~-.~~~~------------~~~~~----~ ~~-~. M SUBJECT MESSAGE H.,. SIGNED SIGNED DATE l 45472 POLY PAK (50 SETS) ..,472 .----r ~ I '. ~. _C':&--____ ':SE.. \ 44'T1-\ 51 ___ -1 .. _ --NOV, 3. 2005-8'.31At-I-KING CO. WLRD __ --------NO , 5845-P. 4--- I Sketch ' ·N I I I I I 1(,410. I I C,S: l5 I I I ~ ,( 1/ ~, } ~ . .J ~ ~ \)" ~ I I o I' r ilea NOV, 3. 2005 a ~:~,IAM7i:.1ING CO, WLRD NO, 5845 -p, 5 • s King' County SUrface Water Management Division Thqlartment ofl?ubli~ WarkB Yes!", Building 400 Yeder Way -Room 400 seattle, WA 98104-2637 (2OG) l'96-65l~ April 8, 1993 Mr. and Ms. John McKay 16404 Southeast 143rd Place Renton,WA 98055 1 l . 1J t [ RE: Notice of King County Code Violation -SWM-DIR 91-0188 " Location: A portion of the northwest quarter (1/4) of Section 13, Township 23 North, Range 5 East, W.M. lying north-of and adjacent to southeast 143rd Place between 164th Av~nue Southeast and 165th Place Southeast. lot 32, in the plat of Serena Park, in King County, Washington. Dear Mr. and Ms. McKay: During an inspection of the property referenced above on October 25, 1992, representatives of the Surface Water Management Division of King County's Department of Public Works found the enclosing of the roadside drainage ditch with substandard materials in the County right-of-way without the required per- mits and approved plans. This is a violation of King County Code Title 9.04.130; A drainage facility-or construction site which: Adversely affects safety and operation of County right-of-way, utilities, or other County owne~ and maintained property; and Results in dirt, mud, water, and/or ice on the roadway. This is also a violation of King County Code Title 14.24.010; Road construction work which does not comply with King County Road Standards; and Title 14.28.020; Work within King County right-of-way without a permit and approved plans. You are therefore requested to contact Delite Koler, Drainage . Investigation and Regulation Unit Engineer, at 296~1986 to discuss the correc- -tive work required to resolve these code violations. No drainage facilities, natural or manmade, may be altered or obstructed without prior permission. If you do not contact this DiVision within 20 days from the date of this letter, we may initiate appropriate enforcement action. This letter is not a Notice and Order as described in King County Code Title 23; however, the exis- tence of the violation noted above may subject you-to civil penalties. and other methods of enforcement authorized by King County Code Title 23. NOV. 3. 2005 8 : 31 AM KING CO. WLRD Mr. and Ms. John McKay April 8, 1993 Page Two .NO. 5845~P. 6 I(mj) .. ~.~.--..~ .. ", .. ~, .... ~ Your timely resolution of this Violation will be appreciated. If you have any questions concerning this matter, please call Delite Kaler, Drainage Investigation and Regulation Unit Engineer, at 296-1986. Sincerely, ~~~ Curt W. Crawford, P.E. Supervising Engineer, Drainage Investigation and Regulation Unit CC;DK:bg . Dll:LT13 cc; Chuck Kleeberg; Director, Department of Development and Environmental Services ATTN: Gary Kohler, Manager, land Use Services Division louis J. Haff, County Road Engineer ATTN: Tony ledbetter, Supervisor, Maintenance Section, Division 4 Jim Kramer, Manager, Surface Water Management Division ATTN: Ken Guy, ASSistant Manager Dick Thiel, Manager, Engineering and Environmental Services Section larry Gettle, Senior Engineer, Drainage Investigation and Regulation Unit Delite Kaler, Engineer NOV. 3.2005 8:31AM KING CO. WLRD NO. 5845 P. 7 OMI ali1!d £66T 's U..tdlf he~~W uqor 'sw pu~ '~W • King County Swfu<e \\'au.,. Management DIvlsion Ikpsrtment of PubUc 'l'brks 7()() Fifth _ Suite UOO Sealtlej WA 9alo.. (,200) l!96-6S19 OW!;) 296-019.2 FAX February 11, 1994 Mr. and Mrs. John McKay 15404 Southeast 143rd Place Renton, WA 98055 RE: Notice of King County Code Violation -SWM -DIR 91~OIB8 Second Notice Location: A portion of the northwest quarter (1/4) of Section 13, Town- ship 23 North, Range 5.East, W.M., lying north of and adjacent to Southeast 143rd Place between 164th Avenue Southeast and 165th Place Southeast. Lot 32 in the plat of Serena Park, in Kj·ng County, Wash; nClton. Dear Mr, and Mrs. McKay: -During an inspection of the property referenced above on February}, 1994, representatives of the King county Surface Water Management Division found that the substandard pipe that was installed in the right-of-way in front of your lot and tied into the drainage system has not been removed. This substandard installation is on the south and west sides of your lot. The fill that was placed in the roadside ditch also has not been removed and the ditch restored to the original design specifications. This is a violation of King County Code Title 9.04.130: A drainage facility or construction site which: Adversely affects safety and operation of County right-of-way, utilities, or other County owned/maintained property: AdVersely affects other drainage facilities; and Results in dirt, mud, and/or ice on the roadway. This -is also a violation of King County Code Title 14.24.010: Road construction work which does not-comply with King County road standards. You are therefore requested to contact Oe1ite Koler, Drainage Investigation and Regulation Unit Engineer, at 296-1986 to discuss the corrective work required to resolve these code violations. No drainage fac11ities, natural or manmade, may be altered or obstructed without prior· permission. If you do not contact this Division within 20 days from the date of this letter, we may initiate appropriate enforcement action. This letter is not. a Notice .and Order as described in King County Code Title 23; however, the existence of the violation noted above may subject you to civil penalties and other methods of enforcement- authorized by King County Code Title 23 • NOV. 3.2005 8:31AM KING CO. WLRO NO. 5845 P 8 Ii; .. • $ Mr. and Mrs. John McKay February 11, 1994 Page Two • Thank you for your attention to this matter. Your timely resolution of this violation will be appreciated. If you have any Questions, please call Delite Koler. s:;;erelv, ~ ~;ord' P.E Supervising Engineer, rainage Investigation and Regulation Unit CC:DK:ss CjWP6: LT24 cc: .Gary Kohler, Manager, land Use Services Division lou Haff, County Road Engineer, Roads and Engineering Division AIIN: Rod Matsuno, Operations Manager, Maintenance Section Tony ledbetter, Maintenance Supervisor, Division 4 Jim Kramer, Manager, Surface Water Management Division ATTN: Ken Guy, Assistant Manager Dick Thiel, Manager, Engineering and Environmental Services Section larry Gettle, Senior Engineer, Drainage Investigation and ~ .. Unit f . " . .'., Engi neer "" H •• '~H ,¥d %.' 4 _NOV 32005 8:31AM KING CO, WLRD NO, 5845 .. . , KING COUNTY SURFACE WATER MANAGEMENT DIVISION PRAINAGE INVESTIGATION REPORT Page 1: INVESTIGATION'REQUEST Type ~ Received by: Date: It) h /9~ . OK'd by; PfU14----FUeNo. 9t; -I 7;) Y Received from: (Please print plainly for :G.Canning). (Day) (Eve) NAME; ~ fiiooLJ) PHONE ddJ'-P5/J'Y __ _ ADDRESS: P!20cfl -iIo jltiJ 0Y' cS"L City yf~ State Zip ?f<?5i Location of problem, if different: R~ported Problem: . , Plat name: ~ p~ Lot No: 3h Block No: Other agencies involved: No Field InvestIgation Needed ~ __ /,' ~=:J,g--23~ Parcel No. 7 tz 955D 6 ~tl ' Kroll 9/;;2 UJ Th,Bros: NeJ.67 83 1/4 ST. R Old 35 f='{p _____ ...:B::a:sin::!M~::.A=Y~~c~:o:un.:::c:il D:r:st':!,/=O<=L...:::C:::ha::rg:e.:.-N:O:::: ==== __ D~9\~ 0 ~ 3.--.::3::........ __ RESPONSE: Citizen 'notified on /6;"/7"'ft,by . phone' letter ~ In person C.(c;s.-ed Qc~ ~:.s'k, ~-f C&h-/i--..:.e.-k..-s Lf"S.. I a-I ~ct.? dN.../.., 'cLe-h.'C. ~~ . DISPOSITION; Turned to, ___ on _____ by __ _ OR: No lurther action recommended becausf ._ Lead agency has bem, notified: -~..--...... ...-,,---........ ---,,..,--c=---:-----.~~-cc--.,,--,-,---- _ Problem has been corrected. _ No problem has been identified. Prior investigation addresses problem: 1 Private problem -NDAP wjJf not consider because: -1(Water originates onsite and/or on neighboring parcel Location is outside SWM Service Area DATE CLOSED; to /-.-lb~ by;::1!I !1/rf.?Ro./3 -See Fjla# .. _ Other (Specify): .• NOV, 3. 2005 8:32AM KING CO, WlRD Kiog County Department ofNatnrnl Resources SurI3ce Water Mauagement DRAINAGE INVESTIGATION REPORT FJI!Ll) INVESTIGATION PJU; NO 95-1724 NAME: GI!NK RIVAS AIl!lRPSS: 14206 164'11lAVESIl PHONE 228-1t'124 MAlNTPNANCB 4 NO, 5845 p, 10 ........ . moMAS PAGIl6mJ3 DATE" 10-17·96 INlTIALS DC!) \. '.' • DETAlLS OF INVESTIGATION: I meet with Gene Rivas at his home to discuss his concerns about a drainage problem in his backyard. Mr. Rivas property abuts up to a parcel of property o~ed by King County Parks that is undeveloped. Mr. Rivas property is saturated from the runoff from tile Parks property. This water tlIen gets under the Rivas house and into the driveway and into a eatchbasin in the front of the Rivas property.· I explained to Mr. Rivas that he should contact a contractor to see about installing a French drain system. I said I would send a copy of tile contracton list and a Fnneh drain detail. SKETCH: • SATURATED AREA I< YARD DRAIN 164TII AVE SE . . . " SURFACE FLOWS' " -; '. ~ ......... NOV. 3.2005 8:32AM KING CO. WLRD NO. 5845 . P,. 11 i \ ~ If< '., , i.' ,,;i<tueeQur:nv SURFACE WATER MANAGEMENT tiiVlStel4. ;., DRAINAGE INVESTIGATION REJ;lORT . . Page'1:',INVEsnGATlON1tEQUE~ .... O.C{) , Rec:efved by: " ~at~ @h \.oca~on of problem: If cfrfferent . Other agencies Inv?lved: ~ x'd' 2-3.~ Paroe/No. 72";'170-0/16 1/4, $ T R ----, . BasIn /.JYl . CouncD Dlst j::J.. Charge No: .Typa OK'd ,by: . . .. . Lot No:' / I . SlockNo: No .Fleld lmestlgatlon Needed __ _ Theros: Newtb5U13 . Old Cl5Fb lESPONSE: Citizen notified on1-]..D-9"1 by ...Ii phone _ letter _Inperson , G~ .... ">\.-~.~.~ ~ G,uA" ~,.:~~ . ~J'~~~, ' ' .. ', ~4-~ r.j 4-~) . A.AlI ~' 'ISPOSfTION: Turned to V< ' On )-1 j: 7'7; by. -;Pvv OR: No further action reoOmmended becaL _ Lead agency has been notified: _ Problem has been .corrected. -----;Nir:o:-:pr:::oIbhle=mLhas:::::-Obc::e7.en::-;ji:i'de::ntifj:=;;·O::ect.::;-----.:...-;......r>.pn:r:·o7'r lnv=es7.tJ;::ga:::ti'-on=-:::adwd=res=s=,es=-p=roble So. FIfe # • _ Private problem -NDAP will not consider because: . . _ Water origina.tes cnslte and/or on neIghboring parcel . Location Is outside SWM Service' Area. ---I~ • DATE~lOSEO: CO 14I~ bY:,p ~ ...:....-Other (Specify): ' . , ticosl-,' NOV. 3. 2005 8: 32AM KING CO. WLRD """> . Complaint 97-206; Don Gr~ 16046 SE 142"" Pl., Renton Investigated bj 'Sean Groom on OIl14/97 NO. 5845 P. 12 '-"'-"--... --_ .. ----- Don Gregg has lived at the above referenced loc3tion since the earlY 60~ (hls house waS second built in the development). Surface storm water ilows began flooding his garage approximately five yearn ago. At his own expense at that time he brought a back hoe in to cut a drainage ditch along the back side of his property. 'Thili open trench provides relief during IIlO5t precipitatiolt events SUIface water moves around his property. Stann Water does breech the top oo:asionally. The ditch:fills sedimenlS up and he clears the ditch of debris that floats down and reduces flow. He wa1ks the drainage ditch during SfDrm events (he wasn't around for tile last stann event) to observe its :functionality as a precaution as well. He wants the drainage to cOntinue down 160'" Ave SE instead or a conveyance system around his and neighbor's property. Apparently, as development north ofhis property has increased additional runoff is concentrated into the drainage along 160'" Ave SE and subsequently runs to his property. 160t.h Ave SE. Standing water. runOfffrom 160'" Ave SE discharges into this area. Low j>OIWlation. Gregg said the land can't be developed because they don't have the percoIation for infiltrntion of septic systems. SE 142nd Place "'" NOV, 3,2005 8:32AM -.-~ m;:ZGlfBOJUlOOll llRAZHAG8 ASSJ:S'I'A1IICI! PRoGRAM <lmlIP> COMPLAIlf.r EVALUM!ION MEMO DATE, 3-19-97 FROM, Alan M .. yera RE: NDAP El/M,UATION FOR COMPLAINT NO. 16046 SE 142ND PLACE RENTON 97-0206 GRAGG 235-016B C~INT CHRONOLOGY: ORIGINAL FIELD INV FIELD 2I1AL. OLD FILES: 1-10-97 1-14-97 3-7-97 NONE BY SEAN GROOM BY ALAN MBrERS. BACKGROlJIllD • Please see the attached drainage complaint investigation report dated 1-14-97 by Sean Groom. FJ:HDIJrGS , Since the problem meets all of the NDAP project criteria listed below, it qualifies for and has been investigated under the NDAP program. • The'problem site is within the SWM Bervice area and does not involve's King County (KC) code violation. • The problem site showS evidence of or reported localized flooding, erosion and/or sedimentation within the off road drainage system on private residential and/or commercial property due in part to later upstream development. • The problem is caused by surface water from more than one adjOining property. SOILS; According to the Xc Boils map, the site is located in the following soil association: 1\LDERWOOD ASSOCIATION: Moderately well drained undulating to hilly soils that have dense, very slowly permeable glacial till at a depth of 20 to 40 inches; on uplands and terraces. I m .. t w.!.th'Mr. Gragg on March 7th and toured his property. As development continues in the approximate 60 acre drainage basin north of his property, more drainage water has been routed south into the pond located just NW of his property which then drains east and south around the edge of his property. 1 · ' . , NOV. 3.2005 8:32AM KING CO. WlRD NO. 5845 P 14 . ~ --._-~-~~-" We elba 142; 4 He requested that the drainage flow~g south along the eaat side of l60th Avenue S~ be rerouted straight south along the east side of l60th past BE l42nd Place rather than the current roqte which flows east and south around his property. Mr. Gragg stated that several long term" residents have told him the drainage used to flow straight south along the west and Bast sides of 150th all the way down to BE l44th. I stated that may be true but the exiating drainage pattern is old and cannot be revised because it is considered the established drainage pattern for his area. I reviewed his and his two neighbor's drainage related impacts and scored the problem at 14 with his garage and septic system impacts and yard damage.to two properties. Although the last few years have been especially wet and bad, I rated the event frequency at 10 or once every 2-5 years which is my estimate of the frequency of how often his septiC 5ystem will be severely ~~cted over the long term. Mr. Gr~gg 9tated that his pumped effluent septic Bystem has workeQ f~e ~or the ~irst 15 years. Howeyer, he has burneQ Up four pumps within the last three years aue to the increased groundwater flows into his septic tank/Qrainfield area. From his wet/dry season observations, he is convinced that most of the groundwater comes frc:.n the drainage ditch located just above his drainfield. We reviewed ways of protecting his septic drainfield from the movement of groundwater from the uphill pond and drainage ditch. We aiscussed ways to seal the earthen ditch itself USing a plastic liner or a large half round or full pipe sections along about 50 feet of ditch above hie dra~field. I pointed out that considerable groundwater may still flow from north to south below the ditch section so that sealing the ditch may not solve the problem. Depending on the depth to hardpan, an impervious vertical layer of plastic or bentonite slurry locatea uphill of his drainfield between his drainfield and the ditch would probably be the easiest and most effective solution to this problem. This impervious layer would run from the ground surface down to the hardpan layer where it would be keyed down into the hardpan layer. Because sqch a layer would restrict the flow of ground water, higher grounawater levels might result in this part of Gragg'B yard with more groundwater surfacing during the 'wet season espec~al1y near each end of such an impervious wall resulting in mors wet season surface wa~er seepage/flows and icy conditions on portions of Mr. Gragg's driveway. For any work this close to the Qrainfield, any yard drain or impervious facility of this k~d would have to be reviewed and approved by the King County Health Department (Wayne Olsen at 295-9737). 2 sau NOV. 3. 2005 8: 32AM KING CO. WLRD NO. 5845 P. 15 .,'-_. --. '~'--•. a ; ;::; g.biO L( 41-£ btl JE )!:esm_: UiJ. OPTIONS AND DISCUSSION Hr. Gragg ~s concerned about continuing upstream oavalopment which typically results in more surfacs water fl~S through his drainage oitch ano occasionally into hiB yaro. 1: explaineo that for J.arger . oBveJ.opments where more than 5,000 square feet of impervious surfaces are conetructed, the devsloper's en9inesr is only required to review tbe drainage system's capacity'up to one quarter of a mile downstream from the proposed plat·s outlet point. For single homesites, there is normally no oownstream analysis required since there is usually les9 than 5,000 square feet of new imparvious surfaces constructed. I suggested that Mr. Gragg lock for Develop$ent Signs along 160th north of his home. When he sees new signs, he can attend public hearings and write letters expressing his COncerns and outlining his drainage impacts. DlPAC':r SCOQ = 140 PROPOSED SOLUTION: No solution to this drainage problem was identified. Mr. Gragg requested that we c1e~ out his drainage ditch. We offered to clean out part of his ditch if our contractor can get the necessary equipment from Gragg's driveway into the ditoh. NO PRIORITY SCORE WAS CALCIJLM!ED SINCE NO SOLUTION' WAS lllENTlF'lED 24 " NOV, 3,2005. 8:32AM KING CO, WLRD NO, 5845 p, 16 , ':KJ,N9 COUNTY WATER AND LAND RESOURCESDIVISXON .. '. 'DRAINAGE INvESTIGATION REPORT iJ.MlsIlOATION REQUEST . '-': Date: t!/~K'dbY:.· FILE No. 2005 -o)-'tO' . Received from: '. NAME: ~. ,tJdiz , . . I . ..... (Day) ,-,"C_-J.} ~70PHONE __ ~_~_ (Eve) l..,C _---1.) ADDRESS: . . City . State Zip __ _ LocAnON OFPROBLEM,JFD~RENT$ I ,,~ ST J.-1{tJ'# ~ s-c Acces's Permission Granted 0 Call First (Would Like To Be Present) D· . - (f d:,~ FrL~ COpy . Plat name: 0 f\ o 55'S Lot No: Block No: Parcel N't~~~LA~'1--'--L KrOll~ Th,Bros: N~w Gs7 is.3 RJ)p Bas41' ~0rzCoU1lcil District IJ- i City ___ Charge No,'---_____ _ 1lJJ,rPONSE: CitiFn notified on ______ by: __ phone _letter __ in person DlSPosmON: Twned to _ on I I· by __ OR; No further actiOli recommended Wcause: _. _ Lead agency h~ been notified: ~ Problem h,., bee;u corrected. ~~-:-:N-o-pr-o:-CbJc-em-.""has-b-een~id-en-tifi-:-::· c-ed-=-.-~---=Pri""':C'of-:in-v~e-sti""·gati----::-:·o-n-addr-:C-:-es-s~e-s pr---=ob-Ie-m-: .' . . . SEE Io'IU # . "c . _ ~te p<oblern -NDAP will not consider because: __ Water originates onsite and/or on neighboring parcel. _~Oth·er (Specit'y): )ATE CLO~: -,--,--I _...LI __ By: __ _ NOV. 3.2005! 8:32AM KI NG CO. WLRD NO. 5845 P. 17 KING COUNT¥WATERAND LAND REsOURCES DMSION , . DRAINAGE INvESTIGATIONllEPORT INvESTIGATION REQUEST TypeC OK'db : FILENo. 005-dl3Y ,Re " (Day) (ZOb) NAMs: _' ~}J~(!::.e~DL~G::-.'...!.,~~t::.:/"~L~E1(~' ~_----,-_ PHONE ,2..10-3 731 (Eve) l..-( _----J.) AtlDRESS:,K C ]) DT -[PbINUrWJb City State Zip ~ __ LocATION OFPROliLEM, IF DIFFERENT: TDR.ltOJ.J:S , ' , ~F /ro2. ~,,!S{i 1M )U( S~!AJo'-Tq oF5~ /lIf/Sr ACfe.fS Pe:rmiYsion GrtDf.ted 0 'Call FU'St (Would Like To Be Fresent) 0 , , Plat name: wtNo: BiockNo: S· T R 'ParcelNo.I'lS7&PO/<fS KroIl"f'I/ ThBros: New 057133 RDP __ Basin Left Council District I ) City ___ Charge No._~ ____ _ ~PONSE: Citizell notified PlI ______ by: __ phone __ letter __ in person' DISPOSITION: Turned to on _--,1_-,1,--_ by __ OR: No further aCtioll recommended because: _ Lead agency has been notified: , . _ Problem has bet:n corrected. _ No problem has been identified. _'_ Prior investigation addresses problem: , SEEF'lLE#, __ _ ~ Private problem -NDAP will not consider becau:;el ' , " Water originates onsite andlor on neigliborin~ parcel. ~_Other (SPe<::ny): DATE CLOSED: _--'1'---'1'---_ By:--- 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN 4.0 FLOW CONTROL AND WATER QUALITY FACILITY ANALYSIS AND DESIGN A. Existing Site Hydrology The entire 9.91 acres of new development is considered till forest for pre-developed condition. However. there is an existing single-family residence located in the northwest comer of the project site, which will be demolished with this development. There is a small amount of impervious surface associated with this single-family residence that contributes runoff to the downstream drainage course under existing conditions. However, this site is modeled entirely as till forest for the pre-developed condition. The flow control facility will be located at the southwest comer of the project site and will discharge much as it does under existing conditions after being dispersed at the southwest corner of the project site. B. Developed Site Hydrology Under developed conditions, to determine the total amount of impervious surface contributing runoff to the pond. all of the streets and sidewalks were considered impervious surfaces and an area determined for all of them. Since this project site is zoned R-4, which requires that the maximum amount of impervious surface per lot be 55 percent, the total acreage of lots was multiplied by 55 percent to determine an impervious area for all of the lots. In addition, the wet/detention pond was considered to be impervious surface for the portion of the surface area of the wet/detention pond that is dead storage. This yielded a total impervious area of 6.37 acres with the remainder of the area as till grass (3.54 acres), totaling 9.91 acres of development. No Flow Control BMPs are included in these areas of development so the actual detention volume computed would be less in the final design when the Flow Control BMPs are applied to the project site for each lot. C. Perfonnance Standards The Area-Specific Flow Control Standard required for this project site is Level 2 Flow Control, a.k.a. the Conservation Flow Control Standard. The applicable conveyance system capacity standard was mentioned in the Conditions and Requirements Summary, which is to size the on-site conveyance system by the Rational method utilizing an initial time of concentration of 6.3 minutes and a Manning's "n" value of 0.014 with the 25-year precipitation. The Area-Specific Water Quality Treatments Menu followed for this project was the Basic Water Quality Menu, and the item selected from this menu is to use the wet pond located below the live storage in the wet/detention pond. D. Flow Control System Please sec the illustrative sketch of the flow control facility located the following pages of the report, as well as the calculations provided for sizing the flow control system for this project. E. Water Quality System Please refer to the same illustrative sketch referenced above, which is provided on the following pages of this report for the wet pond located below the live storage in the wetldetention pond provided with this development. In addition, the calculations for sizing the wet pond are included herewith. I I 778.005.doc [JPJltep] 'tTl'l/l. '10 !:!O:I N'Ild 30'lNI'V!:Ia aN'I S3ll:l0!:ld aN'V a'lo!:! AtlV'NIYill3!:!d .' 00".0." 'ViS <;0086 '1 M '3M3ll38 om ·3.1S '1.33!:1.lS Hl8 ·3N OZCZ( ·d!:lOO l.N3YidOl3113a 88)1 e 0'10II .to S M{l,t,:tSiIlltiI" UJ '" ~ . . -WR-- ---'K~~",'~"~I~~~~~~""~c---~ : 8 , H" i2 ~'8 .!~ ~! 'C !Wn l ';o(] SJ ~IAe]S l V lN)I'lNO!!A~3 ·!}~LI.1\M ns ':Jl\l hNYld ONVl '~~Nm ~~] l Lr\l J '/..\f~ Z9 LIl -I <;l (<;l t» ~ll9 -1 s;z (s;::t ) lCJB6 '1M 'l N 3~ HHiOS 3nNJA'I GNU S; \ lB I M'ta _O( 'fi.S '~J1 ! ~~lL"I ~m J? T~i c------, , i ~~~ ;. 1 , ·0 '"~ , s ~ (!) 0 , <3 ~ a: l : I DETENTION POND SIZING CRITERIA No Flow Control BMPs were applied for this initial sizing; however, they will be utilized with the fmal design. Zoning = R4 The maximum allowed impervious coverage per lot = 55 percent Roadway and Sidewalk = 1.63 ac. impervious 8.28 acres of lots x 0.55 = 4.55 acres impervious Pond = 0.19 ac. impervious Total impervious = 6.37 ac. till grass = 3.54 ac. 11778.005.doc [JPJltcp) v, = v, = v, = Vb = SIZE THE BASIC WET POND [0.9 Ai + 0.25 At,] 0.039 [(0.9)(6.37) + (0.25)(3.54)] (0.039)(43.560) 11,243 cu. ft. 3 V, = 33,729 cu. ft. 11778.005.doc [JPJ/tep] KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac Computing Series 11778pre.tsf Regional Scale Factor: 1.00 Data Type : Reduced Creating Hourly Time Series File I/77! C-ttVftLL,a No /1-2--05 Till Forest Loading Time Series File:C:\KC SWDM\KC DATA\STTF60R.rnt 9.91 acres Total Area 9.91 acres Peak Discharge: 0.799 CFS at 9:00 on Jan 9 in Year 8 Storing Time Series File:11778pre.tsf Time Series Computed KCRTS Command Enler the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:11778pre.tsf Flow Frequency Analysis Time Series File:11778pre.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:11778pre.pks Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location Sea-Tae Computing Series 11778dev.tsf Regional Scale Factor: 1.00 Data Type : Reduced Creating Hourly Time Series File 'rill Grass Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STTG60R.rnf 3.54 acres Loading Time Series File:C:\KC SWDM\KC_DATA\STEI60R.rnf 6.37 acres Total Area 9.91 acres Peak Discharge: 3.76 CFS at 6:00 on Jan 9 in Year 8 Flow Frequency Analysis Time Series File:11778pre.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.625 2 2/09/01 18: 00 0.170 7 1/06/02 3:00 0.463 4 2/28/03 3:00 0.017 8 3/24/04 20:00 0.275 6 1/05/05 8:00 0.480 3 1/18/06 21:00 0.404 5 11/24/06 4:00 0.799 1 1/09/08 9:00 Computed Peaks -----Flow Frequency Analysis------- - -Peaks Rank Return Prob (CFS) Period 0.799 1 100.00 0.990 0.625 2 25.00 0.960 0.480 3 10.00 0.900 0.463 4 5.00 0.800 0.404 5 3.00 0.667 0.275 6 2.00 0.500 0.170 7 1. 30 0.231 0.017 8 1.10 0.091 0.741 50.00 0.980 Flow Frequency Analysis Time Series File:11778dev.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 1.86 6 2/09/01 2:00 1. 52 8 1/05/02 16:00 2.24 3 2127/03 7:00 1.65 7 8/26/04 2:00 1. 99 4 10/28/04 16:00 1. 98 5 1118/06 16:00 2.40 2 10/26/06 0:00 3.76 1 1/09/08 6:00 Computed Peaks -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 3.76 1 100.00 0.990 2.40 2 25.00 0.960 2.24 3 10.00 0.900 1. 99 4 5.00 0.800 1. 98 5 3.00 0.667 1. 86 6 2.00 0.500 1. 65 7 1. 30 0.231 1. 52 8 1.10 0.091 3.31 50.00 0.980 Flow Frequency Analysis 'Time Series File,11778rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks --Rank Return Prob (CFS) (CFS) (ft) Period 0.596 2 2/09/01 20,00 1. 24 5.14 1 100.00 0.990 0.130 7 1/07/02 4,00 0.596 5.04 2 25.00 0.960 0.346 3 3/06/03 22,00 0.346 4.51 3 10.00 0.900 0.107 8 8/26/04 7:00 0.326 4.31 4 5.00 0.800 0.134 6 1/08/05 4:00 0.228 3.56 5 3.00 0.667 0.228 5 1/19/06 2:00 0.134 3.18 6 2.00 0.500 0.326 4 11/24/06 9,00 0.130 2.97 7 1.30 0.231 1. 24 1 1/09/08 11: 00 0.107 2.03 8 1.10 0.091 Computed Peaks 1. 02 5.12 50.00 0.980 Retention/Detention Facility Type of Facility, Side Slope, Pond Bottom Length: Detentj on Pond Bottom width, Pond Bottom Area: Top Area at 1 ft. FB, 2.00 212.00 106.00 22472. 30680. Pond H,lV ft ft sq. ft sq. ft 0.704 acres Effective Storage Depth: 5.00 ft Stage 0 Elevation: 432.00 ft Storage Volume: 128927. cu. ft 2.960 ac-ft Riser Head: Riser Diameter: Number of orifices: Orifice # 1 2 Height (ft) 0.00 3.30 5.00 18.00 2 Diameter (in) 1. 66 2.50 Top Notch Weir: None Outtlow Rating Curve: None ft inches Full Head Discharge (CFS) 0.168 0.221 Pipe Diameter (in) 6.0 Stage Elevation storage Discharge Percolation (ft) (ft) (cu. ft) (ac-ft) (cfs) (cfs) 0.00 432.00 O. 0.000 0.000 0.00 0.02 432.02 450. 0.010 0.010 0.00 0.03 432.03 675. 0.015 0.014 0.00 0.05 432.05 1125. 0.026 0.017 0.00 0.07 432.07 1576. 0.036 0.020 0.00 0.09 432.09 2028. 0.047 0.022 0.00 0.10 432.10 2254. 0.052 0.024 0.00 0.12 432.12 2706. 0.062 0.026 0.00 0.14 432.14 3159. 0.073 0.028 0.00 0.24 432.24 5430. 0.125 0.037 0.00 0.34 432.34 7714. 0.177 0.044 0.00 0.44 432.44 10011. 0.230 0.050 0.00 0.54 432.54 12321. 0.283 0.055 0.00 0.64 432.64 14644. 0.336 0.060 0.00 0.74 432.74 16980. 0.390 0.065 0.00 0.84 432.84 19328. 0.444 0.069 0.00 0.94 432.94 21690. 0.498 0.073 0.00 1. 04 433.04 24065. 0.552 0.077 0.00 1.14 433.14 26453. 0.607 0.080 0.00 1. 24 433.24 28853. 0.662 0.084 0.00 1 .34 433.34 31267. 0.718 0.087 0.00 1. 44 433.44 33694. 0.774 0.090 0.00 1. 54 433.54 36135. 0.830 0.093 0.00 1. 64 433.64 38588. 0.886 0.096 0.00 1. 74 433.74 41055. 0.942 0.099 0.00 1.81 433.84 43535. 0.999 0.102 0.00 1.94 433.94 46028. 1.057 0.105 0.00 2.04 434.04 48535. 1.114 0.107 0.00 Surf Area (sq. ft) 22472. 22497. 22510. 22536. 22561. 22587. 22599. 22625. 22650. 22778. 22906. 23035. 23164. 23293. 23422. 23552. 23682. 23812. 23943. 24074. 24205. 24337. 24469. 24601. 24734. 24867. 25000. 25133. 2.14 2.24 2.34 2.44 2.54 2.64 2.74 2.84 2.94 3.04 3.14 3.24 3.30 3.33 3.35 3.38 3.40 3.43 3.46 3.48 3.51 3.61 3.71 3.81 3.91 ~ . 01 4.11 4.21 4.31 4.41 4.51 4.61 4.71 4.81 4.91 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 6.10 6.20 6.30 6.40 6.50 6.60 6.70 6.80 6.90 7.00 434.14 434.24 434.34 434.44 434.54 434.64 434.74 434.84 434-94 435.04 435.14 435.24 435.30 435.33 435.35 435.38 435.40 435.43 435.46 435.48 435.51 435.61 435.71 435.81 435.91 436.01 436.11 436.21 436.31 436.41 436.51 436.61 436.71 436.81 436.91 437.00 437.10 437.20 437.30 437.40 437.50 437.60 437.70 437.80 437.90 438.00 438.10 438.20 438.30 438.40 438.50 438.60 438.70 438.80 438.90 439.00 51055. 53588. 56135. 58696 . 61269. 63857. 66458. 69072 . 71701. 74342. 76998. 79667. 81275. 82081. 82619. 83427 . 83967. 84777 . 85588. 86130. 86943. 89663. 92397. 95146. 97908. 100684. 103474. 106278. 109096 . 111928. 114774. 117635. 120509. 123398. 126302. 128927. 131857. 134802. 13 7761. 140734. 143722. 146725. 149742. 152773. 155819. 158880. 161955. 165045. 168150. 171269. 174404. 177553. 180717. 183895. 187089. 190297. 1.172 0.110 1.230 0.113 1.289 0.115 1.347 0.117 1.407 0.120 1.4660.122 1.526 0.124 1.586 0.127 1.646 0.129 1.707 0.131 1.768 0.133 1.829 0.135 1.866 0.137 1.884 0.139 1.897 0.144 1.915 0.153 1.928 0.164 1.946 0.178 1.965 0.195 1.977 0.213 1.996 0.218 2.058 0.237 2.121 0.253 2.184 0.268 2.248 0.281 2.311 0.293 2.375 0.305 2.440 0.316 2.504 0.326 2.570 0.336 2.635 0.346 2.701 0.355 2.767 0.364 2.833 0.373 2.899 0.382 2.960 0.389 3.0270.859 3.095 1.710 3.163 2.810 3.231 4.120 3.299 5.590 3.368 7.030 3.438 7.560 3.507 8.060 3.57"1 8.530 3.647 8.970 3.7l8 9.390 3.789 9.800 3.860 10.180 3.932 10.560 4.004 10.920 4.076 11.260 4.149 11.600 4.222 11.930 4.295 12.250 4.369 12.560 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 25267. 25402. 25536. 25671. 25806. 25942. 26077. 26214. 26350. 26487. 26624. 26761. 26844. 26885. 26913. 26954. 26982. 27023. 27065. 27092 . 27134. 27272 . 27411. 27551. 27690. 27830. 27970. 28111. 28252. 28393. 28534. 28676. 28818. 28960. 29103. 29232. 29375. 29519. 29663. 29807. 29952. 30097. 30242. 30388. 30534. 30680. 30827. 30973. 31121- 31268. 31416 . 31564. 31713. 31861. 32011. 32160. Hyd Inflow Outflow Peak Storage 'l'arget Calc Stage Elev (Cu-Ft) (Ac-Ft) 1 3.76 ******* 1. 24 5.14 437.14 2 1. 86 0.63 0.59 5.04 437.04 3 2.24 ******* 0.35 4.52 436.52 1 2.40 ******* 0.33 4.31 436.31 5 1. 98 ******* 0.23 3.56 435.56 6 1. 29 ******* 0.13 3.18 435.18 7 1. 52 ******* 0.13 2.97 434.97 8 1. 65 ******* 0.11 2.03 434.03 Route Time Series through Facility Inflow Time Series File:11778dev.tsf Outflow Time Series File:11778rdout Inflow/Outflow Analysis Peak Inflow Discharge: Peak Outflow Discharge: Peak Reservoir Stage: Peak Reservoir Elev: 3.76 CFS 1. 24 CFS 5.14 Ft 437.14 Ft at at Peak Reservoir Storage: 133167. Cu-Ft 3.057 Flow Frequency Analysis Time Series File:11778rdout.tsf Project Location:Sea-Tac Ac-Ft 133167. 3.057 130208. 2.989 114956. 2.639 109151. 2.506 88360. 2.028 78158. 1.794 72545. 1. 665 48235. 1.107 6:00 on Jan 9 in Year 8 11:00 on Jan 9 in Year 8 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks - -Rank Return Prob (CFS) (CFS) (ft) Period 0.596 2 2/09101 20:00 1.24 5.14 1 100.00 0.990 0.130 7 1107/02 4:00 0.596 5.04 2 25.00 0.960 0.346 3 3/06/03 22:00 0.346 4.51 3 10.00 0.900 0.107 8 8/26/04 7:00 0.326 4.31 4 5.00 0.800 0.134 6 1/08105 4:00 0.228 3.56 5 3.00 0.667 0.228 5 1/19/06 2:00 0.134 3.18 6 2.00 0.500 0.326 4 11/24/06 9:00 0.130 2.97 7 1. 30 0.231 1. 24 1 1/09/08 11: 00 0.107 2.03 8 1.10 0.091 Computed Peaks 1. 02 5.12 50.00 0.980 Flow Duration [rom Time Series File:11778rdout.tsf Cutoff Count Frequency CDF Exceedence_Probability CFS % % % 0.008 30132 49.139 49.139 50.861 0.509E+OO 0.025 6536 10.659 59.798 40.202 0.402E+00 0.042 6230 10.160 69.958 30.042 0.300E+00 0.059 5661 9.232 79.189 20.811 0.208E+OO 0.076 4632 7.554 86.743 13.257 o .133E+OO 0.092 3438 5.607 92.350 7.650 0.765E-01 0.109 1976 3.222 95.572 4.428 0.443E-01 0.126 1510 2.462 98.035 1.965 0.197E-01 0.143 773 1. 261 99.296 0.705 0.705E-02 0.159 47 0.077 99.372 0.628 0.628E-02 0.176 28 0.046 99.418 0.582 0.582E-02 0.193 28 0.046 99.463 0.537 0.537E-02 0.210 17 0.028 99.491 0.509 0.509E-02 0.226 0.243 0.260 0.277 0.293 0.310 0.327 0.344 0.360 0.377 0.394 0.411 0.427 0.444 0.461 0.478 0.494 0.511 0.528 0.545 0.561 0.578 0.595 57 59 34 24 22 19 30 17 15 19 11 1 1 o o o 1 o o o o 1 o 0.093 0.096 0.055 0.039 0.036 0.031 0.049 0.028 0.024 0.031 0.018 0.002 0.002 0.000 0.000 0.000 0.002 0.000 0.000 0.000 0.000 0.002 0.000 Duration Comparison Anaylsis Base File: 11778pre.tsf 99.584 99.680 99.736 99.775 99.811 99.842 99.891 99.918 99.943 99.974 99.992 99.993 99.995 99.995 99.995 99.995 99.997 99.997 99.997 99.997 99.997 99.998 99.998 New File: 11778rdout.tsf Cutoff Units: Discharge in CFS 0.416 0.320 0.264 0.225 0.189 0.158 0.109 0.082 0.057 0.026 0.008 0.007 0.005 0.005 0.005 0.005 0.003 0.003 0.003 0.003 0.003 0.002 0.002 O.416E-02 0.320E-02 0.264E-02 0.225E-02 0.189£-02 0.158E-02 0.109E-02 0.815E-03 0.571E-03 0.261E-03 0.815E-04 0.652E-04 0.489E-04 0.489E-04 0.489E-04 0.489E-04 O.326E-04 0.326E-04 0.326E-04 0.326E-04 0.326E-04 0.163E-04 0.163E-04 Cutoff 0.138 0.176 0.213 0.251 0.288 0.325 0.363 0.400 0.438 0.475 0.513 0.550 0.588 -----Fraction of Timc--------------Check of Tolerance------- Base New %Change Probability Base New %Change 0.94E-02 0.75E-02 -20.0 I 0.94E-02 0.138 0.134 -3.0 0.62E-02 0.58E-02 -6.5 I 0.49E-02 0.50E-02 2.7 I 0.37E-02 0.30E-02 -19.9 I 0.28E-02 0.20E-02 -28.2 I 0.22E-02 0.12E-02 -46.7 I O.15E-02 O.5SE-03 -62.2 I O.10E-02 0.65E-04 -93.5 I 0.62E-03 O.49E-04 -92.1 I 0.34E-03 O.49E-04 -85.7 I 0.21E-03 O.33E-04 -84.6 I 0.16E-03 0.33E-04 -80.0 I 0.98E-04 0.16E-04 -83.3 I 0.62E-02 0.49E-02 O.37E-02 0.28E-02 0.22E-02 0.15E-02 0.10E-02 0.62E-03 0.34E-03 0.21E-03 0.16E-03 0.98E-04 Maximum positive excursion = 0.005 cfs ( 2.3%) occurring at 0.208 cfs on the Base Data:11778pre.ts£ and at 0.213 cfs on the New Data:11778rdout.tsf Maximum negative excursion = 0.200 cfs (-34.1%) occurring at 0.587 cfs on the Base Data:11778pre.tsf and at 0.386 cfs on the New Data:11778rdout.tsf 0.176 0.213 0.251 0.288 0.325 0.363 0.400 0.438 0.475 0.513 0.550 0.588 0.161 0.214 0.233 0.255 0.279 0.314 0.332 0.355 0.373 0.379 0.382 0.387 -8.3 0.4 -7.0 -11.4 -14.1 -13.5 -17.1 -19.0 -21. 6 -26.1 -30.6 -34.1 Flow Duration from Time Series File:11778pre.tsf Cutoff Count Frequency CDF Exceedence_Probability CFS % % % 0.138 60737 99.049 99.049 0.951 0.951E~02 0.155 116 0.189 99.238 0.762 0.762E~02 0.172 74 0.121 99.359 0.641 0.641E~02 0.189 39 0.064 99.423 0.577 0.577E~02 0.206 38 0.062 99.485 0.515 0.515E~02 0.223 39 0.064 99.548 0.452 0.452E~02 0.241 34 0.055 99.604 0.396 O. 396E~02 0.258 31 0.051 99.654 0.346 0.346E~02 0.275 20 0.033 99.687 0.313 O. 313E~02 0.292 21 0.034 99.721 0.279 0.279E~02 0.309 18 0.029 99.750 0.250 0.250E~02 0.327 19 0.031 99.781 0.219 0.219E~02 0.344 25 0.041 99.822 0.178 0.178E~02 0.361 17 0.028 99.850 0.150 0.150E~02 0.378 13 0.021 99.871 0.129 0.129E~02 0.395 14 0.023 99.894 0.106 0.106E~02 0.413 14 0.023 99.917 0.083 O. 832E~03 0.430 9 0.015 99.932 0.068 0.685E~03 0.447 10 0.016 99.948 0.052 0.522E~03 0.464 8 0.013 99.961 0.039 O. 391E~03 0.481 6 0.010 99.971 0.029 0.294E~03 0.499 2 0.003 99.974 0.026 0.261E~03 0.516 3 0.005 99.979 0.021 0.212E~03 0.533 2 0.003 99.982 0.018 o .179E~03 0.550 1 0.002 99.984 0.016 0.163E~03 0.567 1 0.002 99.98:5 0.015 0.147E~03 0.585 2 0.003 99.989 0.011 o . 114E-03 0.602 3 0.005 99.993 0.007 0.652E-04 0.619 3 0.005 99.998 0.002 0.163E-04 0.636 1 0.002 100.000 0.000 O.OOOE+OO 0.653 0 0.000 100.000 0.000 O.OOOE+OO 0.671 0 0.000 100.000 0.000 O.OOOE+OO 0.688 0 0.000 100.000 0.000 O.OOOE+OO 0.705 0 0.000 100.000 0.000 O.OOOE+OO 0.722 0 0.000 100.000 0.000 O.OOOE+OO 0.739 0 0.000 100.000 0.000 O.OOOE+OO Flow Duration from Time Series File:11778rdout.tsf Cutoff Count Frequency CDF Exceedence_Probability CFS % % % 0.008 30132 49.139 49.139 50.861 0.509E+00 0.025 6536 10.659 59.798 40.202 0.402E+00 0.042 6230 10.160 69.958 30.042 0.300E+00 0.059 5661 9.232 79.189 20.811 0.208E+00 0.076 4632 7.554 86.743 13.257 0.133E+00 0.092 3438 5.607 92.350 7.650 0.765E-01 0.109 1976 3.222 95.572 4.428 0.443E-01 0.126 1510 2.462 98.035 1. 965 0.197E-Ol 0.143 773 1. 261 99.296 0.705 0.705E-02 0.159 47 0.077 99.372 0.628 0.628E-02 0.176 28 0.046 99.418 0.582 0.582E-02 0.193 28 0.046 99.463 0.537 0.537E-02 0.210 17 0.028 99.491 0.509 0.509E-02 0.226 57 0.093 99.584 0.416 0.416E-02 0.243 59 0.096 99.680 0.320 0.320E-02 0.260 34 0.055 99.736 0.264 0.264E-02 0.277 24 0.039 99.775 0.225 0.225E-02 0.293 22 0.036 99.811 0.189 0.189E-02 0.310 19 0.031 99.842 0.158 0.158E-02 0.327 30 0.049 99.891 0.109 0.109E-02 0.344 17 0,028 99.918 0.082 0.815E-03 0.360 15 0.024 99.943 0.057 0.571E-0} 0.377 19 0.031 99.974 0.026 0.261E-03 0.394 11 0.018 99.992 0.008 0.815E-04 0.411 1 0.002 99.993 0.007 0.652E-04 0.427 1 0.002 99.995 0.005 0.489E-04 0.444 0 0.000 99.995 0.005 0.489E-04 0.461 0 0.000 99.995 0.005 0.489E-04 0.478 0 0.000 99.995 0.005 0.489E-04 0.494 1 0.002 99.997 0.003 0.326E-04 0.511 a 0,000 99.997 0.003 0.326E-04 0.528 a 0.000 99.997 0.003 0.326E-04 0.545 0 0.000 99.997 0.003 0.326E-04 0.561 a 0.000 99.997 0.003 0.326E-04 0.578 1 0.002 99.998 0.002 o .163E-04 0.595 0 0.000 99.998 0.002 0.163E-04 Duration Comparison Anaylsis Base File: 11778pre.tsf New File: 11778rdout.tsf Cutoff units: Discharge in CFS -----Fraction of Time--------------Check of Cutoff Base New %Change Probability 0.138 0.94E-02 0.75E-02 -20.0 I 0.94E-02 0.176 0.62E-02 0.58E-02 -6.5 I 0.62E-02 0.213 0.49E-02 0.50E-02 2.7 I 0.49E-02 0.2'>1 0.37E-02 0.30E-02 -19.9 I 0.37E-02 0.288 0.28E-02 0.20E-02 -28.2 I 0.28E-02 0.325 0.22E-02 0.12E-02 -46.7 I 0.22E-02 0.363 0.15E-02 0.SSE-03 -62.2 I 0.lSE-02 0.400 0.10E-02 0.6SE-04 -93.5 I 0.10E-02 0.438 0.62E-03 0.49E-04 -92 .1 I 0.62E-03 0.475 0.34E-03 0.49E-04 -85.7 I 0.34E-03 0.513 0.21E-03 0.33E-04 -84.6 I 0.21E-03 0.550 0.16E-03 0.33E-04 -80.0 I 0.16E-03 0.588 0.98E-04 0.16E-04 -83.3 I 0.98E-04 Maximum positive excursion •.. O. 005 cfs ( 2.3%) occurring at 0.208 cfs on the Base Data:11778pre.tsf and at 0.213 cfs on the New Data:11778rdout.tsf Maximum negative excursion ~ 0.200 cfs (-34.1%) occurring at 0.587 cfs on the Base Data:11778pre.tsf and at 0.386 cfs on the New Data:11778rdout.tsf Base 0.138 0.176 0.213 0.251 0.288 0.325 0.363 0.400 0.438 0.475 0.513 0.550 0.588 Tolerance------- New %Change 0.134 -3.0 0.161 -8.3 0.214 0.4 0.233 -7.0 0.255 -11. 4 0.279 -14 .1 0.314 -13 .5 0.332 -17 .1 0.355 -19.0 0.373 -21. 6 0.379 -26.1 0.382 -30.6 0.387 -34.1 4 . TYPES 3 and 4 FILE CONTENTS / LOG SHEET (Format Plat, Rezone, Special Use, Shoreline Redesignation) FILE NUMBER: L06POOOI PLATIPROJECT NAME: CA VALLA PLANNER: Chad Tibbits HEARING DATE(S): _______ ~ CONTINUANCE HEARING DATE(S), ____ _ PROPOSED ORDINANCE NO.: ______ _ ENGINEER: Bruce Whittaker RELATED APPLICATION & FILE NO. AOSPM066, AOSPM134 APPLICATION FILED (date): 01112/2006 EXAMINER DECISIONIREC: ________ _ COMPLETE APPLICATION (date): ."..2/9/00 APPEAL FILED: D NO DYES date: _____ _ A. COUNCIL ACTION: ________ ORDINANCE NO.: __ _ EFFECTIVE DATE: _____ _ HEARING DATE(S) ____________________________ _ 1. D NOTICE OF APPEAL 2. D APPEAL ARGUMENTS B. HEARING EXAMINER'S ACTIONS 1. D PREHEARING CONF. NOTICE date(s): 2. D HEARING NOTICE date(s): 3 D PREHEARING ORDER date(s): 4 D CONTINUATION date(s): 5. D REPORT date(s): 6 D RECONSIDERATION date(s): 7. D APPEAL SUMMARY date(s): C. DDES STAFF ACTIONS 1. D CONTINUATION NOTICE date mailed: _____ _ 2. D REPORT date mailed: _____ _ 3. D ADDENDUM REPORT date mailed: _____ _ 4. D TRANSMITTAL TO EXAMINER (POR's/DOCS/STUDIES) date sent: _________ _ 5. D PROPOSED ORDINANCE NUMBER EMAIL TO THE KC CLERKS OFFICE date sent: ____ _ D. SEPA REOUIREMENTS 1. THRESHOLD DETERMINATION: ________ _ DATE ISSUED: ______ _ 2. DATE 500' RADIUS/AGENCIES/PORS/STAFF SENT: _________________ _ 3. APPEAL FILED: DYES DNO a. APPELLANTS: _____________ _ date received: _______ _ date received: _______ _ date received: _______ _ b. APPEAL ARGUMENTS: __________ _ date received: _______ _ date received: _______ _ date received: _______ _ L06POOOl ~UBLIC NOTICE REOIDREMENT 1. NOTICE OF APPLICATION a) AFFIDAVITOFPOSTINGIPOSTINGPACKAGESENT dZ/;z7 t0b REC'D .3h~ b) LEGALAD SEATTLE TIMES date(s) sent: d'/;22/;;0 date published: 5/'pdJ& LOCALS date(s) sent: c:J /d 7/06 date published: 3/2d')b c) 500' RADIUS/AGENCIES/POR's/STAFF date(s) sent: 3 //C).@ b • 2. NOTICE OF RECOMMENDATION/PUBLIC HEARING a) LEGALAD SEATTLE TIMES date(s) sent: ______ date published: _____ _ LOCALS date(s) sent: date published: _____ _ b) 500' RADIUS/AGENCIES/POR's/STAFF date sent: _____ _ (} APPLICATION Date received: January 12, 2006 1. 0 INTAKE CHECKLIST 2. 3. 4. 5. 6. 7. 8. 9. o AJPLICATION FEE ~PLICANT DESIGNATION FORM i LEGAL DESCRIPTION ~ ;SSESSOR'S MAPS: 56 If"-d/i -LJS= 0(' 9RTIFICATE OF WATER AVAILABILITY 14CER TIFICATE OF SEWER AVAILABILITY o PRELIMINARY HEALTH APPROVAL o sPRTIFICATE OF FUTURE CONNECTION 10. f1" pRE DISTRICT RECEIPT 11. Ii yE PLAN/PLA T MAP 12. [H"'Lj;2}(i LOT PROOF 13. [!(""¢IDAVIT CONCERNING CRITICAL AREAS COMPLIANCR \ \. 14. iif'YNVIRONMENTALCHECKLIST Q<..,\)(~lC>T\ K<.1IL'\,~\\\ ,§l 15. rtf TRANSPORTATION CONCURRENCY 16. ~VEL ONE DRAINAGE ANALYSIS /."t, j( -/,,«,u ,It,wv,rlA-' >' 17. Er6THER NN~7/' c:!/JC.CS 18. e-iV AIVER(S) --/.6'-LW?~;~;6!40,-,Y-',--_____ _ 0; ADDITIONAL PLANSIMAPS .---1. CONCEPTUAL DRAINAGE PLAN ([) WETLAND MITIGATION PLAN Q) REVISION NO. I-PiJ.£ ~ REVISION NO.2 5. REVISION NO.3 6. REVISION NO.4 ~. OTHER MAPS ~)AkoJ ?)1'7~y .£ 0& ;dz/dk @ tot!..d~~ /(~,;l/O& @J ~ £ouf~~7P--/tJ7 \ \ U) I6.V.Pr.1 R~ t""pml9X)JQ.(l} -IIQ«n~ kKS,E ~-k .. \, ~\\\ a'll e), _________________ _ 0, ________________ __ G SPECIAL STUDIES 1. WETLAND/STREAM REPORT 2. GEOTECHNICAL REPORT @ TRAFFIC STUDY 4. WILDLIFE STUDY 1 L06POOOl DATES RECEIVED (}) OTHER~~O~e:t~~~~8f~~/if~~4f) C ______________ _ n~· ______________ __ 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. cul..>UL SE 144TH STREET L EVEL 3 DOWNSTREAM DRAINAG E ANALYSIS MI. [)avr~ F'otT Ie " I I S, '" i.-I ; r , Des fv1I)Jll' 'r;:" 'vV/1. qc: i ~)R KBS lleveloprner 11 1)3:2(' I\JE 811, <:'lI,··el Siliit 111[l Ot:l!f'V.lf~ \Nf' Cit..;.~· \~ cagle Creel-. I ilnd & Develurrnent. LLC: I" 'I ",I->t, "(: ", f "I II v\'/\ LlXClj .-j r---- I ! ... i ' -~~-~--~;~ ;,,~ I , • ,"! I ,'" ! Ed McCa l illl P t P.S ,.)f.)~) If J t,,\, I!II ~-.,F I?f Ie ~ V'l/t-~)~q I: ".j r, I ... " J _) ( .1 !--5 i -,~1 fd~'J~f-" -;liIJ' MAIN FILE COpy Acknowledgements SE 144th Street LEVEL 3 DOWNSTREAM DRAINAGE ANALYSIS Prepared by: Ed McCarthy, P.E., P.S. 9957 171 st Avenue SE Renton. WA 98059 Tel. (425) 271-5734 Fax (425) 271-3432 Prepared for: Mr. Dave Petrie 811 So. 273rd Ct. Des Moines. WA 98198 KBS Development 12320 NE 8th Street Suite 100 Bellevue WA 98005 Eagle Creek Land & Development, LLC 13701 SE 253rd St Kent, WA 98042 June 16, 2007 TABLE OF CONTENTS I. Background Information ............................................................................................. I-I 2. Hydrologic and Hydraulic Analysis ofSE 144'h Street.. ............................................ 2-1 3. Drainage Mitigation Options ...................................................................................... 3-1 4. Key Results and Recommendations ............................................................................ 4-1 5. References ................................................................................................................... 5-1 LIST OF TABLES Table I. Contributing Basins .......................................................................................... 2-4 Table 2. Peak Flow Rates at Key Locations ................................................................... 2-8 LIST OF FIGURES Figure I. Vicinity Map .................................................................................................... 1-2 Figure 2. Study Area ....................................................................................................... 2-2 Figure 3. Soils Map ......................................................................................................... 2-3 Figure 4. Basin Map ........................................................................................................ 2-6 Figure 5. SE 144'h Street Conveyance System ............................................................... 2-9 Figure 6. Offsite Mitigation Options .............................................................................. 3-2 APPENDICES Appendix A. Photographs of the Downstream System Appendix B. KCRTS Documentation for Contributing Basins Appendix B.l KCRTS Time Series Calculations Appendix B.2 KCRTS Pond Designs Appendix B.3 KCRTS Peak Flow Rates Appendix C. XP-SWMM Model Results Appendix D. HEC-RAS Analysis of Roadway Conveyance j; 1. BACKGROUND INFORMATION This report provides an assessment of the conveyance system along SE I 44th Street in the Renton Highlands area of King County, Washington (Fignre I), The study area is located within a catchment of Orting Hill subbasin (Tributary 0307) of the Cedar River watershed (King County Department of Natural Resources, 1993 and 1997), The conveyance system has a contributing drainage area of 253 acres. The conveyance route is downstream from three proposed single- family residential developments that are currently under drainage review at King County DDES, These developments include Threadgill Plat, Liberty Gardens, and Cavella. This Level 3 Downstream Drainage Analysis has been prepared at the request of DDES. Flooding currently occurs at locations along the SE I 44'h Street conveyance system, Flooding has been observed at the intersection of the I 62 nd Avenue right-of-way and SE 144th Street (Photo No, I in Appendix A), In addition, King County Roads Division has recently constructed conveyance improvements at the intersection of I 60th Avenue SE and SE 144'h Street, presumably to collect overflow from surrounding catch basins. While the conveyance system is apparently undersized for its contributing basin, there is a surprisingly little documentation in King County's records that flooding exists or has occurred in the past along SE 144th Street. Neither the long-time owner of Alpine Nursery nor an original resident at Carolwood, that I interviewed, had observed road flooding along SE 144'h Street over the past several years. The evaluations presented in this report are intended accomplish the following: • • • • Delineate the conveyance network's contributing basins and quantify the flow rates draining to the conveyance network. Estimate the conveyance capacity of the system, including the 18-inch diameter pipe, northerly roadside ditch, and roadway, Identify areas of flooding, Develop conceptual drainage solutions to mitigate impacts from the proposed and future development projects, 1-1 SE J 44'" Street -June 2007 l\ SE 144th Street Drainage Analysis o Vicinity Map 2,000 King County, Washington I Feet \ \ \ , \ .. D :~b Ed McCarthy, PE, PS -6115107 9957 171st Aver'lJe SE """ton. Washington 98OS9 Phme: (425)271-0134 Figure 1 Fax: (425) 271-3432 2. HYDROLOGIC AND HYDRAULIC ANALYSIS OF SE 144TH STREET 2.1 Contribnting Basins In effort to develop a hydrologic model of the basins contributing to the conveyance system along SE I 44'h Street, basin boundaries were delineated using the following resources: • • • • • • • • • • • • City of Renton aerial topography (I-meter contours) Level I Downstream Drainage Analysis for Threadgill Plat (Baima & Holmberg, Inc. and Ed McCarthy, PE, PS. November 18, 2005) Level I Downstream Drainage Analysis for Evendell Plat (Haozous Engineering, June 15,2001) Technical Information Report for Hamilton Place (Barghausen Consulting Engineers, June 2003) Technical Information Report for Evendell Plat (Haozous Engineering, June 15, 2001) Technical Information Report for Nichol's Plat (Haozous Engineering, May 2003) Technical Information Report for Liberty Grove (Daley-Morrow-Poblete, Inc., February 2003) Record drawings for storrnwater design for Carolwood (May 1977) Record drawings for storm water design for Liberty Lane (Doneshvar and Associates, PS, June 13, 1979) Record drawings for SE 144'h Street (King County Department of Public Works, January 18, 1984) Record drawings for 154'" Place SE Slope Stabilization Project (King County Department of Public Works, June 23,1997) Field verification of key locations in the watershed The study area under consideration is shown in Figure 2. Cover types within the study area include those associated with relatively dense single-family residences, forest, and pasture. Soils in the watershed are mostly of the Alderwood series (Figure 3). However, a band of outwash soils (Everett series) exists along SE I 44'h Street, at the southern boundary ofthe study basin and extends to the south. In total, an area of 253 acres was calculated to drain to the conveyance system (Table I). Based on cover type estimates, about 25 percent of the contributing area is effective impervious surfaces. The size and boundaries of the delineated subbasins draining to the conveyance system 2-1 SE J 44k Sfreel-June 2007 Study Area 400 SE 144th Street Drainage Analy sis .-----,1 Feet 9957 171 s! Aveooe SE Renlon , Wasruogton 98059 Phone (425) 271·5734 Fax' (425) 21 1·3432 Date : 6 /15/07 Figure 2 124th 128th '"~''''''''' \\ ~ 138th 139th Soils Map 132nd 136th 133rd £ 18 137th 1361h SE 144th Street Drainage Analysis King County, Washington ~~ .~ 130th \, ~ . \ .. \. 131s1 • 132nd '. 132nd ....... "~ ..... ~., '1 Age 133rd 134th: I-----~ 134th \. i Study Area I A/clerwocLi 315;'1 "i.;: Basin 'SpriAs ..... 1 r-------- 132nd 134lh 1401h o Ed McCarthy, PE, PS - 1,000 I Feet 9957 17181 AvellJEl SE Rsnton, WashifIgton 98059 RIono (425) 271-5734 FlOC (425) 271-3432 5/03107 Figure 3 Table 1. Contributing Basins Basin Till Till Till Outwash Outwash Outwash JD Forest Pasture Grass Forest Pasture Grass Impervious Total AC AC AC AC AC AC AC AC 10 -0.16 0.29 0.08 0.53 20 -0.30 1.05 0.51 1.86 30 -0.31 0.91 0.41 1.62 40 0.26 0.30 0.56 42 -0.03 0.96 0.67 1.66 44 0.99 0.99 50 0.51 0.51 52 -0.01 0.80 -0.01 0.80 1.15 2.77 54 0.03 0.03 0.83 0.04 0.04 1.24 1.44 3.64 60 0.52 0.52 70 -0.51 1.70 -0.34 1.13 1.34 5.04 80 5.28 0.12 4.35 0.59 0.01 0.48 3.40 14.23 90 0.40 0.40 100 0.45 0.33 0.61 0.17 1.56 106 2.50 0.12 3.34 0.12 3.34 4.64 14.05 110 6.43 12.24 12.33 7.10 38.10 120 0.58 1.00 1.58 130 2.49 7.12 5.80 1.58 16.99 200 4.45 0.14 1.79 1.18 7.56 210 3.31 1.70 4.60 2.93 12.55 220 1.56 1.90 3.46 230 3.95 5.71 9.66 232 1.38 ---1.38 240 3.65 4.48 8.13 241 0.23 2.99 3.68 6.90 244 0.71 11.46 10.75 4.68 27.60 250 -0.17 4.66 3.23 8.06 260 2.33 1.74 4.07 270 --2.22 1.60 3.82 300 9.47 1.73 4.13 1.56 16.89 304 2.12 1.36 5.73 3.74 12.95 306 1.25 0.15 0.28 0.08 1.75 310 9.32 ---9.32 320 8.92 0.18 0.33 0.09 9.52 330 1.37 0.34 0.62 0.17 2.50 59.71 42.22 75.40 0.63 1.32 10.47 62.98 252.73 Effective Impervious = 25% 2-4 SE J 4.f' Street June 2007 were driven by the locations of catch points and the watershed's topography. A total of 35 subbasins were delineated (Figure 4). Recent higher density single-family developments contributing to the conveyance system include Hamilton Place (Catchment C-260), Evendell Plat (Catchment C-230), Nichols Place (Catchment C-220), and Liberty Grove (Catchments C-240 and 241). The attenuation provided by the stormwater ponds for these developments was included in the hydrologic model of the basin. In addition, the stormwater pond for Carolwood (Catchment C-I 06) infiltrates runoff for at least up to the I OO-year event. Record drawings were also obtained for Serena Park (Catchments C-70 and C-80) and for Liberty Lane (Catchment C-330) but these older pipe detention systems from the late 1970's do not provide substantial detention volume and were not included in the hydrology model of the basin. Record drawings for the conveyance system along SE 144th Street (King County Department of Public Works, January 18, 1984) were found to be accurate when checked against field observations and a recent field survey. The drawings show that the 18-inch diameter CMP is perforated in the upper half of the pipe. According to the plans, the pipe is set in a gravel bed to allow infiltration. This design encourages infiltration and groundwater recharge by taking advantage of the relatively flat pipe slope and surrounding outwash soils. While this pipe configuration provides baseflow benefits to down gradient tributaries of the Cedar River, the perforations do not provide much flood relief during large flows. Assuming a reasonable infiltration rate of 10 inches per hour, and a 42-inch wide infiltration surface that extends from 162 nd A venue SE to 156 th Avenue SE, the rate of water infiltrating from the pipe to the native soil would be roughly 1.5 cubic foot per second. This rate is small relative to the predicted 100- year flow rate of almost 40 cubic feet per second. While the infiltration component of the conveyance system has been noted, it was not included in the hydraulic model of the system. 2.2 Hydrology Assessment of Contributing Basins The hydrologic model KCRTS was used to develop runoff time series for each of the basins contributing to the SE 144th Street Conveyance system (Appendix B.I). The reduced I-hour KCRTS time series data set was used for the Seatac rainfall region with a correction factor of 1.0. The I-hour time series is appropriate for the modeling conducted because flows from a sizeable portion of the basin are routed through detention ponds. In addition, the KCRTS modeling methodology neglects attenuation that occurs when time series are routed through the watershed. Time series routing through stormwater ponds was conducted to characterize the attenuation provided by some of the more significant storage areas in the basin, including the stormwater detention system for Hamilton Place (Catchment C-260), Evendell Plat (Catchment C-230), Nichols Place (Catchment C-220), and Liberty Grove (Catchments C-240 and 241). In addition, the infiltration stormwater pond for Carolwood was assumed to infiltrate all runoff from 2-5 SE } 44" Sfreel-June 2007 Catchment C-I 06. The stage-storage relationships for these stormwater ponds are listed in Appendix 8.2. Peak flow rates for the 25-year and 1 OO-year retnrn periods at key locations in the watershed and along SE I 44th Street are shown in Figure 4. The peak rates associated with the 2-, 10-, 25-, and 100-year return periods at these same locations arc listed in Table 2. The major inflow points to the SE l44th Street conveyance system are at the intersections of l62nd Avenue SE and l56th Avenue SE. A totallOO-ycar flow rate of39.72 cubic feet per second was predicted to flow to SE l44th Street from contributing basins. 2.3 Hydraulic Analysis of Conveyance System The conveyance system along SE 144'h Street consists primarily of an 18-inch diameter CMP located along the south side of the road. A ditch and culvert system is located on the north side of the road. The ditch and culvert system is not continuous along the entire length of SE l44'h Street. Rather, it is broken up by segments of road with no conveyance on the north side of the road. The northerly ditch and culverts are connected to the 18-inch diameter storm pipe by 12- inch diameter cross culverts at four locations along the convcyance routc. At 156'h Avenue SE (CB-6), the diameter of the pipe system increase to 24 inches. From CB 6, the pipe system continues west in the unimproved SE 144'h Street right-of-way. At CB I, the pipe is conveyed down a steep embankment to 1 54th Place SE and then to an HDPE tightline down the steep ravine slope to Tributary 0307 (King County Department of Public Works, June 23,1997). A detailed field survey of the entire pipe and ditch network, including several road sections, was conducted by Barghausen Consulting Engineers (June 2007). These data were used to construct the XP-Storm and HEC-RAS models described below. The hydraulic model XP-Storm (Version 9) was used to evaluate the 18-inch diameter pipe conveyance system along the south side of SE 144'h Street. The EXTRAN layer of the model was utilized, basing hydrologic inputs on flow rates predicted by KCRTS. The XP-Storm Hydraulics engine solves the complete St. Venant dynamic flow equations for gradually varied, one dimensional, unsteady flow throughout the drainage network. The calculation accurately models backwater effects, flow reversal, surcharging, and pressure flow. The model allows for looped networks, multiple outfalls and accounts for storage in conduits. The XP-Storm model accounts for pipe friction losses and pipe entrance and exit losses. A Manning's roughness coefficient of 0.024 was assumed in the modeling for CMP and a value of 0.012 was assumed for concrete and plastic pipe. An entrance coefficient 0[0.5 and an exit coefficient of 1.0 were used at catch basin junction. XP-Storm modeling results for the 25-year peak flow rate for the conveyance pipe along SE l44'h Street is provided in Appendix C. 2-7 SE 14¢l' Street -June 2007 ~: L-t--'. t-; _ -1 ;-1 I ; I ______ ~.::::::=r -:;:-'<-~-\ -', ,r I I " I f --L-.; -I I! ,----, ....... _\ \ '-I ,_--:--t-~L-,=---=L:=-~L~_=:-.:-=--=---;-----___ L____ : L_--L---l-L 'I _\~ Legend :~~~----l lmr11~l rlT "'r(\\~Yf E? ::n2B~~nda~ 11 , I I _______ , I ~----f---f---' --T+~t'~==ri I 1----'------~---i ~ i~ 0 Type 1 CB jl I r I ,1----+---1-----__ , '\ 1 I I II '''-P ' IC I I 11 i , I r \ I ,----'------,.----l-I v Ipe u vert ----_-i. __ , ____ I I : I I \ 1 I I I, I / ' , I ! lL---TJ 1\---r------l I"~ \--1-------, l --~ L ~-1_,J >( I C-1 0 1 Basin 10 I ' I , , r I ~--T T r' , -----'-----------I,! 1='-\ ,-L_ ---_-I [_-_\l---l I ! I I I :11 \]') I " • I ~ 'h _L-L,~ L \---1 ' I ~-'------l ~ \ I " I I ---c-· -t-!! ',-I', ,,'" ___ I ---1 ---' T----~i l: \ I I --'--'~----,I I' I I 'J --t{-I Y '-, I~-'\ ~-,---, -----I -'--,--'--' , " " ' .1 f---r<--j, I- I ~l II 1-111 --, I -! IT fi n l rl -f"'! -:-l' ':'L-;I-~f-=-II----'I , II~ --LJ-=~1 L_= '" I f--Ii ~ ---'-. _L. Lc--q ---I 1--' -.-~~ II ' TT l L 1------J=:;::I:;-.l-:--=,=-~I-d_!l ~--1----I C-244 ----T n:_-:-i --..j: i 11'--1 '~-rtl f l -1--------1 __ I rr r T -1'--1-~T-l \ [~-~-~! ---I ~ _ ----~ L, '" ---I 1 : J_J--! __ ~ 1_, -' __ L. ,I -----J 1---1 LLLLLd I :-l ! [Z130 1-'------'-i l! 1---") I 1~1 ! r--r-=-i ----,--+--~-, I I ~ , I T-t----1 i I I , ~l---' .. , I I 1 'I 'I i' I 1 1 ! I II I 1-----'11 '[ J -'l~~--" -...,. .. ,.",., [' --1: II I L_ I l __ ~ s-__ .1. ~ -~_.J __ '! ~---. , ,_ -1 "I' 1--'·k 1 I J I 1 \ L 1 ~r [T :q~' LI' -. _. \~ __ ~ "j:':r -~---:-.::·"-~il ··J~-----__ L_ -1 'I i__ rL - -----,-----~~,j --,---~---,J 0 " ___ I ::=1 1--- '-'--"---' ----t~ll i L \ J~ I ~ I C~J-l ]-i ~-~ f'}. r//"I -fJ r-I--l----I -r j i l-~~L __ \ -I , "J...~: -C-250 -i---C-304 ~\:r(_l J! :1'---1 I hJI-- L J l---~ -----' --, . ----!--.l l,. --... 1 __ 1=. J I I l I ir----, --.-'--t L 1---,,-..1 J ---I ----T ------r---i i r---,h---J C-241 j 11,-.1 ;t"li-i ! . ;i----T -r --~--:..r'-='- 1 ' I , ': 1 --.--. , ,. I '-----'---1 C-306 : I I ~-----L-I I , I ' ,I ' : -~ 1 1 I ' : -----,-I -=--;::.:..~--.:.-~-:-.'-,-.!-!I---_~--\-I --\ ,=._}.':~Grove l ,..r--L.L J.JJ_ r. _~ ___ ,' J I I lie L 'M iL_LJ I I II T " .,. L j __ , ___ .. ... L'=:--_,J.._I_, U / \ I-L.J I, '\ I I ' 11" ---'i --1" ----'-t:i ~V8f1dE~~a1-:~I'~'·' ---I C-240 f--- I I ------, .1 1._, _ I: f-I/'-k{-l t-J _ . j [1:-_-rrTL--T Tt ~ rl c:~o I ~_J=-D Liberty Grove --, I--~---I ----J If -r' ,LjL'-l-'-lJ -, \~L i..; )--- -----' 1 I II I I I 1 .' I n. TTC-/J I 1---. __ i_, ___ ,! -, __ L, __ L_L .J -I "'=J-',¥ l~J , I : I I '----J I : JILl L I '-J'_I c-220 D ,I ' J I , ," I T ,c,--"-I L J J' I I :! I ! I t f-=-,---.L.J __ I \--,------I ---~-----[ , I i ~_·:::'-.:.'::--~-=-:::-'.:i I ~' ~ , ~ ,'r ;---, -,-r-j -----,-, : -.. I I I I I I' , --I I "-.-------=-~. ---Ll --Llr-LL~ ___ , ____ L~-T __ ~ l_ -\_\ __ ._ '\, I r 1 --~-I: \ I I \ 1 C-300 r 1 -\----.--- l ,----T--_L ~ i---1----1 \, -'-I I \.: 1 .,."., II 1------1 I 1 " ~Il~'" I ~ I , j---------I_.-:-j (u l--'-r '_L. --=j ~~ \, ',I ~ i \. J J . !'l I I ! I ~~---\-------'1 -'------·1 .. -'-I ~ i I .r::. -'''-• I '-. -. I r-,> E ! ,i i---.'1' --§,' "'-""\ \ ". \ Liberty Gardens I 1 c-ao 1 """'" I , ~J\ / ~ r----r----.,-,-. -, " , \ 1 1 ,---! --;---\ \ ,,~ 1 I 1 'I I \ \ . \ i , 1-,--\ .. \ \ ,/ I ------I \ .. -.. -,-,,; I : ,--25-YR: 8.36 CFS ':"--~:' '-rP~r'-i -: 1; I rr -I' -r----r---h- l00-YR: 10 .88 CFS I ,!. _____ ,_ ,_ r-_-,w'-.J. C-44 SE--14.e I "I_I,; I 'I L I ~-, -1 I --. \ l .>.~ , , rOI -'-'''''-''', ""'" ----I)/fpr 'c CalO ' r -r-'I .' ,7 ell --.-.1 __ i 1 j I Ilc_1 ~6 ~! r / ~-i : . . I ~I --'1:--', -t--'(\)' rr (;='1-0000"'" C[~t ~---.--=--' ;-=--.-, -,-' ~>~=-C-52 , -J'/'T''c,,: ,j f I C.70 -I-I T .-_J \ II -,,---l! \-'I 25-YR: 22.23 CFS I I I I : "" -----, .~'-. i 1././ ', __ L" -', /1 11, L -.! l00-YR: 39.72 CFS _L _ L 1, L. . ___ I C·54 ,.v ' ) ---I I ,.. p , " ---I i If -[' I : 1 ::-----"-=~r-::;:~::-\ ,--~-_~_L :-'-=-.:..--:::;L-C-42 i ,_p', .L;=L,llJ! ~~;~~;:~~.~~g~~ f __ '''r-j \r ~YR: 30.85 CFS 't-f• ·"-f ::-rr ".' -r.=--";~··-~.'I +-.-'." \ .. 'T.,~--:-'SE i!l'i"\ St' 1--\ ' 'I --r--r --" ---; '-,- l00-YR: 39.72 CFS I, -r-~I ---I--~, ,E,1"('1h St ~ -'-+ ~ I " [ ~ r l I I C·20 -.J C-30 I r' --.~-I_J C-40 ~ _ I" '---1 -' -~ -, , : I --, I ---1-l ____ ,1 I 25-YR: 2l.31CFS CSO -1 ,tT'~'" ,c-ao I--1 I C-90 1 ---.---"-"--' I-_____ ,·r ..J I '~ .-----~ l00-YR:27 ,42CFS ./~ '/" '\ \ L: 1--.---,_ ,_.I ' I I "--I 1--'-'----J '/,..... '0'" . -i'L: -----=.=!-"-.::o "--"i:::.--~'~~:?_-\'. ______ -.~---I t--r-_~.l =--1__ ,\ i! ,{\L' [-i""Y~~'--;-.TT--. r~'.--I--TT' (~17 )J 1---1,--". \ ) -j ,---:/1 . \ .--L,-.I~ \ ........ t.C7L-L~,l _J I If-, \----~:" Note:-F!eak IfIoW 'fi ates Ifriidjc;,~d-bYI KCRT ~' IRates .aSBuml\' I"O -IoSS~-fr6iTfcJnVl!i"r'ce~'ys~m , I-ri I-" --.,..·tr~.\J;J· ____ ... ~ 1 \, .<' j -I \ 1 \, I \,~ I I 1 r---r-----t Cavella " ]4 t.... Date: 6/15/07 Basin Map 400 • ...,.",,,,...,...,, ..• _. • SE 1441h Street Drainage Analysis I 0 I Feet 995717lstAveru, SE Phone ' (425 )27 1,5734 Figure 4 Re nton, Washington 98059 Fax : (425) 271 ·3432 King County, Washington n;:nT";::q'Zpo , Table 2. Peak Flow Rates at Key Locations Location Return Period (Years) 2-Yr (CFS) lO-Yr (CFS) 2S-Yr (CFS) lOO-Yr (CFS) CB-lSA 9.S6 15.70 19.0S 24.66 160'h Ave SE 11.23 17.65 21.31 27.42 CB-5 11.72 IS.37 22.23 2S.52 CB-4C 4.25 6.S6 S.36 10.S6 CB-4 16.09 25.43 30.S5 39.72 The hydraulic model HEC-RAS was used to model the roadway surface and ditch conveyance under flood conditions for the 100-year peak flow rate. The I OO-year peak rate assumes that 5 cubic feet pcr second is conveyed in the IS-inch diameter stonn pipe along the south side of the road. The remainder of the flow is assumed to be conveyed in the roadway and roadside ditch. The roadway conveyance capacity was evaluated from CB-IIA (HEC-RAS Sta 0+00) to the intersection of 162 nd Avenue SE (HEC-RAS Sta 10+ I 0). HEC-RAS analysis ofthe roadwal conveyance system for the 100-year peak rate indicates that the ditch system between 162 n Avenue SE and 160'h Avenue SE has adequate capacity to convey the 100-year peak rate. However, driveway culverts along this reach would be overtopped. In addition, the HEC-RAS model predicted that flow depths would be up to 0.7-foot deep over driveways. HEC-RAS results are presented in Appendix D. Roadway flooding along SE 144'h Street would be considered as "severe roadway flooding problem" according to King County standards (King County Department of Natural Resources, January 2005) due to the following conditions: • Bctween the intersection of I 62 nd Avenue SE and 160'h Avenue SE driveway culverts along the ditch on thc north side of SE 144'h Street would become overtopped, posing a threat of unsafe access due to indiscernible driveway edges. • Floodwater over the driveways on the north side of SE 144'h Street between 160th Avenue SE and CB-IIA would be deeper than 0.5 foot, posing a severe impediment to emergency vehicle access. 2.4 Flooding Locations and Flood Flow Paths Flows with return periods of2 to 5 years likely surcharge the IS-inch diameter pipe system. Flows were predicted to leave the pipe and ditch drainage system at a number oflocations including CB-4C, CB-IOA, CBI4A, CB-15A, CB-15A-I, and CB-18A. Between the intersection of 162 nd A venue SE and 160'h A venue SE, overflow from the catch basins is conveyed to the west in the roadside ditch on the north side of the road. From the intersection at 160'h Avenue SE, overflow from the catch basins is conveyed to the west mainly along the north side of the road. Flooding covers the north half of the north travel lane at locations near CB-IIA. From CB- II A, floodwater is conveyed further west in the north travel lane until it reaches a low lying area located north of CB-9A. Depending upon the magnitude of flows, the floodwater either 2-8 SE J 44'" Street -June 2007 1 l Legend Ii , _ , I l ,=-=-"~~:-'--=---=-=~-~--'=---=--=-=J ~ ___ ~ __ ~ __ ~!:I -----I -i -----f ----I--'~-;-~ ! \ \ I! I ! 1 'I I I 1 ' '-• ! , I I . ' ~----, " , I \ " 1 ' 1 I I I I \ . ----'-----Ii U--'-L -:-~_L ____ L __ ~---------____ I , ____ -\-__ \\: _________ -; ---1 ,1 1 'I , '. [~ I 1----1 ! ; I 1 I I \ '-. C-300 I Ii I , I ''-. _ I # " \ . ' : -------------'I ', " '. 1 I I ~ -~--~---___ .J _____ ', ,\.. ' ----i ~ 'I 1 I \ \ 1 ; ! I "! ! I ill I_c -:-::-:-::l \' I ,------,,--. ____ 1. _____ ..L.-.....~_ ----I I 1 C-2l0 !l ,', 'I" I i I I r----------I '-\ '., -I -~ I' I ' I I ! w------.l------~"_:::i I----, I 'I (/), 'l-, I . 'I 1 I ! I ! ~I -----\ 1 ""'1 ' I I , ____ -,--_ ___ «" " t-~ , 1 I 1 " " -i I ! 1 £ '. \ I J \ • , I I 0 " 1 ! . ' , 1 1 W 1 c,o ", I '-'--'" I , .,......1 . I ', j ----, • : (/) I I I I '-'- I --' I I ., ~ "1"---.------~ _ _L.__ • \ I '. / /1 ,> i I!' I \ \ \ I ---, --~---! CJ R/D r----···-"I ; i l. .. _ ... _.: ~ Basin Boundary Flood Flow Path o Type 2 CB o Type 1 CB 12-18" Pipe/Culvert 24" Pipe/Culvert I C-l0 i Basin ID .---.'., /1 :« 1 i; I \ \ I J' '------,----, I i £ , 'I :: \ . \ ~" \ '. I ' CD '_" • .----" \ \ \ ' , II) I I 1'1 --h.-H-H-_, i 1 ,.----", , /: I ~ : I ! i _"'_'_' __ '_'_'_... I> I . f --"Y' , \ \ \ /' ! :-----.-,----./"" -I T -Ii; i." I ' ~. , .>"./' I / I ' /'. I \ \ '\ ,--" --}../' I 1 I J / I '-1--- 1 I .---- .-' .---:;" /~ ,/ ' ' , ; --------11 I ,.. , '!,.. I . \ \ I,..-'---.____-----r .:. /~ 1 1 t 42iii1--,! ! I . ./ S \ ',-----/ -"----1 1 / ! . ../' , 1 PI ", I 1,.--1." C200 1 -----I 'I ' ./ I ~ _ _ __ ~ .. , ,,----.-, ,...--r--.. i '_._ .. -"-' I C-44 1 \ • __ " , ' -,,). ------I 1 I'i I I ----~-T' ---,-----~--,-, ---~------. ----. --~ I. L_ -,,----l, !' . I D 1 • "I! 1 I " ..... I i • I . -----~--, , I ,I 1 "', 1 • / -'i l I ! i I I I Iii I I I 1 'I // ----1 1 I I, . ! . , , , , I ' ", \ i i /' I ---'-' I : I I C-l06 .-'I " , I ~J .~--I c ,[;B fr'"'-f e B--4 6-'--. ---1 I -~. ~B .L --( ____ _ !_I ___ 1_, -L -T~! / /: ' l C-lOo. __ t-! ,1(1 1 ! T I Likely Flood Area ii i '1"-< . -4__ i" 1:--I. i I / ~ I I : -----~_ ._ --, __ , !==_ ] I~ \ ~ .. i ! i . .,! 'I h' , ' , /, and Flowpath .J' I I' --I -------.r:::::l. -',/ I i t--/ \ I I, C~ " #_L-__ I ___ -"-,--_ -" ___ _I _____ ,____ _ ' i /,,- /" C I . ':t:-I A 1 II/, '-;-, II!, I eJ ) ~ ',--" " : ': I ,'" I ! r"\ i r0:/ ' ; 1 ~. :-1" -I i ! j I \ I \ 1 • ' i C-42 , ! I i ' " \ I CB-l CB -2 CB-3 I i i ' I i I I. .; /5 I I -I I I I i ' , , , I , ~ 1 I ::/~ CB-l~A CJ3-llB ~ _~) . __ ~ _______ , " 'I.e r,;:' .-•• --••• -:-.=.-... -... -, .. -... -... -... ~ .. ---.-1-' CEI=o_.L. ---'---: -' .. -'1.iZ,' :;L7-/C ~ -._ ,_ -CB -18A .... ,:' \." \~\ (C-" iii i t+l i -!--I ~ll m '::::::'::--+-,'-'''--"I-=---=~' r C-40 I ~ s6 j J lh St ! C-SO , ; jL __ --.1 '. \L I / ' ", ~ _--.1.-. __ ~ ~ I ~ I IlL 1 , ' I".... ' ,'::::' --/' > r C-20 ---C-3 0 I I L' ; I I -' ; ,I ! i "".--,--L '---I.' \\ x" '-----1 ..J I -----~ j--J -'~,'------/ J -----,I \ " , '\ ,,~ 1 I ------.J I " I I I 1 I " / / __ ! /~ ",'/ _._ ....... , . \ ,"': \, /-\ ;' \' ' "\ 'I I I I ' --i I I / / I //. \ \ " 'I '.'----,-----, . " -J __ , ' , "I' / /--_ I ' " 1 ~--' I I ; '" -. \ ",' I ~ I ' , '. " I 'I , , / i,. . \ ---~"-"'-.-L~-1 ---I. 1 I 1 ~ : i ' 1 /' ' \ I ------J---, I ' / I, ' ." )----1 I' I I I I t-__ , __ ,_-_ \ '\ I . 'I I ' , '-',"""" .,--L I 1 1--.-----' ---I I Iii I " \~ -----{ 1-----I ! I -j \ '\ , , ,/' .// ~ iii ~ o o N I() f :J CI u:: ;:t;N c;;; ~~ ~~ ~~ !;E ill w~ ~ ~ S ~~ ~:s ~~ ~~ gL~ -CD CD LL () E ,~ QI <f) ->-wo; >.c en« c: QI ., .B Cl o g> c: C c :E '" ,-'" >-~ ~ CD O > ;; c 0 c ::> ()-0 ., u ..;~ Cl en(/) c :5£ ~ ~~ -~ ~~ infiltrates at this location outside the road right-of-way or continues to flow to the Carolwood infiltration pond. Flows larger than approximately 10 to 15 cubic feet per second likely do not reach beyond CB 5 (located at the intersection of I 60 th Avenue SE and SE I 44th Street), within either the pipe or roadway. 2-10 SE 1 #~ Srreet ~ June 2007 3. DRAINAGE MITIGATION OPTIONS The following four concepts were developed to mitigate for the proposed developments' impacts of downstream flooding: • Providing onsite detention to King County Level 3 flow control standards • Providing offsite conveyance system upgrades (Offsite Option I) • Providing offsite conveyance system upgrades and infiltration (Offsite Option 2) • Providing offsite conveyance system upgrades and infiltration by implementing bioretention (Offsite Option 3) 3.1 On site Level 3 Detention Level 2 stormwater detention standards are required for the Threadgill, Liberty Gardens, and Cavella developments. When downstream severe roadway flooding is of concern, Level 3 stormwater detention standards are often included in the drainage design for new development as a stormwater mitigation. Providing this type of mitigation has been used with success on several projects in King County. Level 3 detention standards would likely adequately mitigate the impacts of flooding from the proposed projects on downstream flooding. Adequately mitigating the flooding problem, at minimum, requires that runoff from the projects not aggravate the existing level or duration of floodiug nor create new flooding. Adopting this strategy as a mitigation has several advantages that appeal to developers. Because the mitigation is entirely onsite, the developer has control of its design and implementation. No easements, consents, or coordination with downstream property owners is required. The mitigation is typically easy to implement because it is simply a mailer of enlarging the already proposed Level 2 stormwater facility. This type of mitigation particularly makes sense where the proposed development is small relative to the surrounding basin and the required downstream upgrades are either logistically difficult or overly expensive to implement. The main disadvantage to providing Level 3 detention as a flooding mitigation is that while existing problems are typically not aggravated, the problems are not solved either. 3.2 Offsite Conveyance Improvements Offsite mitigation Option I would include improving the conveyance system along the north side ofSE 144th Street (Figure 6). Between I 62nd Avenue SE and 160th Avenue SE this would entail upsizing driveway culverts and re-grading and cleaning open sections of the existing roadside ditch. From 160'h Avenue SE to I 56th Avenue SE, a distance of about 1,300 feet, an 18-inch diameter storm pipe would be constructed to increase conveyance capacity. SE /4(A Street-June 1007 i !-1 1:' 1/-;=1 =O=P=~=io=n =1----c~o-n-v-e -y -a -n ---'ce----r ~'~e~~1 .. .. 'I I , w (fJ I CEl -1 '\' " » \ : \ ,\.: :;. " ,". \. , CB-2 - \ \ \ '-," ., ,OJ CB-4 A ~~ 1_ <t:, .c ' .--..: '-, _.I .. __ , ___ _ I CB-4 ~-----f-'--.'-=T"- ill I j I ({) ~ C~~5 i= -~-.- --", .• i . 'Jr='::-" ___ ,_ e -I , , CB-6 1 1 ICB-7 : CEJ:.8 --,-". ", , 'I : I I ,-" L , L 1 _____ 1 / i I A .•. : CB-4B E CB-4 &--· ----~ . L I " I "-~,----T- ; T"' , / ~9 ------'~ , , • ---.--~ I ....... -.... ~\ C , \ <1l L __ _ '-~1 " " >----) r-~----, <t: , .c ' 18" Conveyance i5 "'. Pipe .... ( - _I j CB-1 5A , __ .J I (:B-11O ___ .dU1C;; ,J2, ,,~1'\' , I " " , ~-Ditch /C ul ve rt Upgrades w (fJ ., OJ c I i ~ F -I' -" -'.~ -J -,f=fB.:LBA _ . ---.. --~r--.-L --: -t'ST r CB~O-~:"~11 '=r'-~B r 12 --~C;_1 ~-=-~~~:' . .. I --:-+- F B-1~ -1-__ _ __ ~_.,_ ~ ___ ._ CB -1 6 SE 144 th SI I'CB-17 iCB-18 , , I "1 I .... 1-_ .... j " ! I , . I I , I \ I' t---.. _---1-",,-I \ '.J . // '\ ! ~ i _J -.... /' \ icn \, --c--'-_ __j 2~ ._: ,~ j --r-'-,-------, w i, Ie , .L .. _ ' I "., , . f en f--r, \ I I i> i , ., --L ' , '. J .. __ , __ I ,<t: I In fi ltrati on 1 ~ ,-----, --I ", ";'--'v/ , !~ , P d I (1) • ") j N Option 2 -Conveyance/Infiltration L __ _ 9B-1 9- .I I '-..---._! --,L__ o n _ ~-J.r-18" Conveyance .;( i _,I __ ' J ~. ' I 'P'pe ,1' r I \ I 12" Ov erflow , I i5 1 ' I I . \ ' I I '" , I . i \~ C ~-~ ___ CB-2 CB-3 _~_ .c B l _..L 1~ __ ~ _. ______ ._I __ L_L b D ! ~! C~~1~~~ __ ~_ _!_ 1 ! ~B-1 8A-' _ .. _ l _, ___ '_.,. __ ".-__ ,.. ___ .. __ .,. ____ ~~ __ ¥ ____ "_ /J-lj.c ~ 'J ib'·'1 cf .• ~ i C"~ r ~'·'i t"J1i t L~'t l i t1~ c;"-~;'~·mto~' t '~\.'-t/ , \\'. '.. :~ ~'\. . }~~'" ., . '.': " ;' \ \.' ~-'--T -,-' _J If, , ,L-.-.-..J-'_-4 k __ ._, __ _ __ , • ! I ' I I f.-r----, . ~ a "' <0 !i 8 o o N '" Q) ~ " Cl U. ;s;~ C;>~ ~;::: NN ;j');;;- NN ~!!. • l~ 11l o w~ ~~ g~ ~ 0 ~~ ~ ~- ~j ~ Q) Q) LL r '- -,----,----;---r-"" , I! . I--i-"o~ i " ~~~ ~K ' I I I I I ' I J' /' __ ,_.J I I i ~=~ 1/11 l-II! I I I ! / i I I I I ! In .~ Option 3 -Bioretention I-4B ' ,j -eB~eJ---.---.LL_.J ''---I, __ I . J ___ I i ._! _\ -L-T ~ I ! ~ f I -j _ \ ~,/ c. .. ____ J'-- /.(' I i [ -j I " . r---' --1 --' ---1 11 "'--1' ~ ~ \ h=! ~ / / O[ ., f /i ,~~, 'w " . ~ _ , .L.., I '0 ./ C ~ '" '(,( I i. I (fJ 1 Bioretention p8 D,a . ai Y 'I ~,/ .2 Cl s: i;' 13,f c"",,,' ! .0'"' . No"" '" .. , C'-'" . _ _ > I \ " • ; 1\ '\ ..I~\: q, ~I I· ,"'0....,. , 1 l 'i ;E a; 8 " c ., c,·, ce-, ~I c,l . . .. , . ; ,_______ ~ ~ ! I ,." ~.h ~ ",.. •• c,. '" .• " -::~1!. II .,Il·c," ._"' oJ; -, ~ ~e-tU_ -ce.'~_--b Bq1 -~f:l~ SSi12 SE144th It f CB - 17 I~B-~ 1/_1 B - 19 -;;-5 i ~ < f <? ------, .-----", I · /' I 'I --.-. ,/ '_ /-. ><.' ~ -. I . --t--f" - Similar to the pipe system on the south side of the road, the possibility of including sections of perforated pipe embedded in drain rock on the north side of the road should be investigated. Issues such as the impact of infiltrated water on the structural integrity of the road base and surrounding properties should be evaluated by a geotechnical engineer. 3.3 Offsite Conveyance Improvements/Infiltration As with Option I, offsite mitigation Option 2 would include improving the conveyance system along the north side of SE 144th Street. Between I 62 nd Avenue SE and I 60th Avenue SE this would entail upsizing driveway culverts and re-grading and cleaning open sections of the existing roadside ditch. From 160 th Avenue SE, an 18-ineh diameter storm pipe would be constructed to convey stormwater to an infiltration pond located about 600 feet west of I 60th A venue SE. An overflow structure from the pond would tie into the existing 18-inch diameter storm pipe on the south side ofSE 144th Street. The proposed location of the infiltration pond is a large lot with a smaller single-family residential structure on it. The lot could perhaps be subdivided with the vacant tract being purchased by the County. The pond site is likely within the current flood flow path oflarger storms (Figure 5). The infiltration characteristics of the pond site are likely favorable, as has been noted with the successful operation of the pond at Carol wood for several years. The infiltration pond would take advantage of the high infiltration rates of the underlying outwash soils and would reduce the flow rates to the storm pipe downstream from the pond. Environmental benefits of the system would include improving water quality and increasing groundwater recharge to the benefit of down gradient tributaries of the Cedar River. 3.4 Bioretention along SE 144tb Street Offsite mitigation Option 3 would entail constructing bioretention swales within the right-of-way along the north side ofSE l44th Street (Figure 6). Bioretention is a commonly applied low impact development (LID) strategy that has also been used with great success in improving roadway drainage in established neighborhoods. Seattle's Soft Edge Alternative streets (SEA- streets) have been shown to substantially reduce stormwater runoff and improve neighborhood aesthetics. To manage stormwater runoff along SE 144th Street, a series ofbioretention cells would be constructed in place of the existing northerly ditch and culvert system. Each bioretention system would be configured with an engineered soil media, a gravel infiltration trench, an overflow control, and a conveyance pipe/driveway culvert linking the cells together. In addition, each cell would be landscape with native plants. The bioretention cells would take advantage of the high infiltration rates of the underlying outwash soils and would also increase conveyance capacity for higher flow rates. Environmental benefits of the system would include improving water quality and increasing groundwater 3-3 SE 144'" Street -J,me ]007 recharge to the henefit of down gradient tributaries ofthe Cedar River. In addition, the bioretention cells would improve the aesthetics of the neighborhood and also provide shade. Disadvantages of the bioretention system would include disrupting existing landscaping of property owners and reducing street parking. 3·4 SE 14.f Streel-June 2007 4. KEY RESULTS AND RECOMMENDATIONS 4.1 Key Results The following conclusions can be drawn based on the hydrologic and hydraulic analysis conducted for the conveyance system along SE 144 th Street presented in the preceding sections of this report: • The threc proposed developments (Threadgill Plat, Liberty Gardens, and Cavella) collectively represent 10 percent of the study area basin. o While calculations presented in this report suggest that the conveyance system along SE 144th Strcet is undersized, there are no drainage complaints on record that support this. Physical evidence of flooding has been documented at the intersection of 162 nd Avenue SE and SE 144[h. Drainage improvements have also recently been constructed by King County Roads Division at the intersection of I 60th Avenue SE and SE 144th Street, likely in attempt to collect overflow from the catch basins at that location. o The 18-inch diameter pipe along SE 144th Street has a capacity of 4 to 6 cubic feet per second. The roadway and ditch system along the north side of the road convey the majority of higher flows. o HEC-RAS analysis of the roadway conveyance system for the I OO-year peak rate indicates that the ditch system between I 62 nd A venue SE and I 60 th A venue SE has adequate capacity to convey the I OO-year peak rate. However, driveway culverts along this reach would be overtopped. o Flows with return periods of 2 to 5 years likely surcharge the 18-inch diameter pipe system and flood the intersection of I 60th Avenue SE and SE I 44th Street. Overflow from the catch basins is likely conveyed in the roadway until it reaches a low lying area located north of CB 9. Depending upon the magnitude of flows, the floodwater either infiltrates at this location outside the road right-of-way or continues to flow to the Carolwood infiltration pond. o Four flood mitigation concepts were presented and discussed including increased onsite detention and three offsite mitigation options. 4.2 Recommendations Anyone of the four proposed drainage mitigations would adequately meet the intent of the King County Surface Water Design Manual (January 2005) Core Requirements. Offsite mitigation Options 2 and 3 would provide the most benefit to the downstream system in terms of stormwater management and environmental advantages. While onsite stormwater mitigation would perhaps the easiest and least expensive option to implement, the downstream flooding problem would not be solved. 4-1 SE 14.f' Street -June 2007 Implementing the offsite mitigations would require King County's leadership, and even ownership of the project. This would be especially true for offsite Options 2 and 3, where a vacant parcel would need to be acquired (for Option 2) or the right-of-way would need to be substantially re-graded (for Option 3). For any ofthe offsite options to be adopted, the County would need to see value in solving drainage problems along SE 144'h Street and in the environmental benefits provided by these designs. Providing bioretention through SEA-streets and the like, to solve existing and potential future drainage problems, should be a consideration for the County. To my knowledge, the County has not implemented a project similar to Option 3, and this would be a suitably-scaled pilot project. F or these offsitc options to be implemented, each developer would likely make a fair and reasonable contribution to the project. The County would be responsible for designing and implementing the project. 4-2 SE 144'~ Streer -June 2007 5. REFERENCES Baima & Holmberg, Inc. and Ed McCarthy, PE, PS. November 18, 2005. Levell Downstream Drainage Analysis for Threadgill Plat. Issaquah, Wash. Barghausen Consulting Engineers, June 2003. Hamilton Place -Technical Information Report. Kent, Wash. Daley-Morrow-Poblete, Inc., February 2003. Liberty Grove -Technical Information Report. French, Richard, H., 1985. Open-Channel Hydraulics. McGraw-Hill Book Company. New York. Haozous Engineering, PS. May 2003. Nichol's Place -Preliminary Technical Information Report. Mukilteo, Wash. Haozous Engineering, PS. June 15,2001. Evendell Plat -Preliminary Technical Information Report. ODES File No. L98P0047. Renton, Wash. King County Department of Natural Resources, 1997. Lower Cedor River Basin and Nonpoint Pollution Action Plan. Seattle. King County Department of Natural Resources, 1993. Current & Future Conditions Report for the Cedar River. Seattle. King County Department of Parks, Planning, and Resources, 1990. Sensitive Areas Map Folio. Seattle. King Count~ Department of Pub lie Works, January 18, 1984. SE 144'h Street-156'h Ave. SE to 164' PI SE. Sheets 1 -8. Seattle. King County Department of Public Works, June 23,1997. 154'h Place SE Slope Stabilization Project. Sheets I -13. Seattle. King County Department of Natural Resources, January 2005. King County Surface Water Design Manual. Seattle. U.S. Department of Agriculture, Soil Conservation Service, 1973. Soil Survey of King County Area, Washington. 5-1 SE J 44'* Street -June 2007 Appendices Appendix A. Photographs of the Downstream System Appendix B. KCRTS Documentation for Contributing Basins Appendix C. XP-SWMM Model Results Appendix D. HEC-RAS Analysis of Roadway Conveyance SE 14.f' Street -June 2007 Appendix A: Photos of the Downstream System .... Photo Number I .... Photo Number 2 Date of Photo: 1-11-06 (Source: Dave Petrie) Date of Photo: 1-21-06(Source: Dave Petrie) Location: South of CB 18A, looking north. Location: North of CB 18A, looking soutb. Description: Overflowing pond during height of rainstorm. Description : Pond north ofSE 144tn Street within the 162"'1 Water is flowing to the roadside ditch on the north side ofSE l44th Street. right-of-way during a light stonn. Appendix B. KCRTS Documentation for Contributing Basins Appendix B.1 KCRTS Time Series Calculations Appendix B.2 KCRTS Pond Designs Appendix B.3 KCRTS Peak Flow Rates B-1 SE } 4.f' Street -June 2007 Appendix B.1. KCRTS Time Series Calculations KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-lO.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Outwash Pasture Outwash Grass Impervious Loading Time Series File:C:\KC_SWDM\KC_DATA\STOP60H.rnf 0.16 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STOG60H.rnf 0.29 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STEI60H.rnf 0.08 acres Total Area 0.53 acres Peak Discharge: 0.071 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-lO.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-lO.tsf LogPearson III Coefficients Time Series File:c-lO.tsf Project Location:Sea-Tac Mean~ -1.641 StdDev~ 0.141 Skew~ 1.196 Frequencies & Peaks saved to File:c-lO.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-lO.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-lO.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series B·2 SE J 4.r Street -June 2007 Project Location : Sea-Tac Computing Series c-20.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Outwash Pasture Outwash Grass Impervious Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STOP60H.rnf 0.30 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 1.05 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.51 acres Total Area 1.86 acres Peak Discharge: 0.331 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-20.tsf Time Series Computed KCRTS Conunand Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-20.tsf LogPearson III Coefficients Time Series File:c-20.tsf Project Location:Sea-Tac Mean~ -0.857 StdDev~ 0.119 Skew~ 0.941 Frequencies & Peaks saved to File:c-20.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-20.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedenee Probabilities to File:e-20.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-30.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Outwash Pasture Loading Time Series File:C:\KC SWDM\KC DATA\STOP60Il.rnf 0.31 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STOG60H.rnf B-3 SE J 4.f Streel-June 2007 Outwash Grass Impervious 0.91 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.41 acres Total Area 1.63 acres Peak Discharge: 0.276 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-30.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-30.tsf LogPearson III Coefficients Time Series File:c-30.tsf Project Location:Sea-Tac Mean~ -0.949 StdDev~ 0.121 Skew~ 0.973 Frequencies & Peaks saved to File:c-30.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-30.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-30.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location ; Sea-Tae Computing Series c-40.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STOG60H.rnf Outwash Grass 0.26 acres Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.30 acres Total Area 0.56 acres Peak Discharge: 0.145 CFS at 16:00 on Mar 3 in 1950 SE 144'h Srreet -June 2007 Storing Time Series File:c-40.tsf Time Series Computed KCRTS Command B·4 Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-40.tsf LogPearson III Coefficients Time Series File:c-40.tsf Project Location:Sea-Tac Mean~ -1.10~ StdDev~ 0.105 Skew~ 0.664 Frequencies & Peaks saved to File:c-40.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-40.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-40.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-42.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STOP60H.rnf Outwash Pasture 0.03 acres Outwash Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 0.96 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.67 acres Total Area 1.66 acres Peak Discharge: 0.373 CFS at 16:00 on Mar 3 in 1950 SE 14¢h Streel -June 2007 Storing Time Series File:c-42.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies 8-5 Flow Frequency Analysis Loading Stage/Discharge curve:c-42.tsf LogPearson III Coefficients Time Series File:c-42.ts£ Project Location:Sea-Tac Mean~ -0.747 StdDev~ 0.110 Skew~ 0.794 Frequencies & Peaks saved to File:c-42.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-42.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-42.dur 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 c-44.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.99 acres Total Area 0.99 acres Peak Discharge: 0.408 CFS at 0:00 on Oct 6 in 1981 Storing Time Series File:c-44.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-44.tsf LogPearson III Coefficients Time Series File:c-44.tsf Project Location:Sea-Tac Mean~ -0.596 StdDev~ 0.096 Skew~ 0.562 Frequencies & Peaks saved to File:c-44.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-44.tsf B-6 SE J 4.fA Street -June ]007 Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-44.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac c-50.tsf 1. 00 Computing Series Regional Scale Factor : Data Type : Historic Creating Hourly Time Series File Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.51 acres Tolal Area 0.51 acres Peak Discharge: 0.210 CFS at 0:00 on Oct 6 in 1981 Storing Time Series File:c-50.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-50.tsf LogPearson III Coefficients Time Series File:c-50.tsf Project Location:Sea-Tac Mean~ -0.884 StdDev~ 0.095 Skew~ 0.562 Frequencies & Peaks saved to File:c-SO.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-SO.tsf Durations & Exceedence Probabilities to File:c-SO.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series S·7 SE 14tf' Street-June 1007 Production of Runoff Time Series Project Location : Sea-Tac Computing S~ries c-S2.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTP60H.rnf Till Pasture 0.01 acres Till Grass Outwash Pasture Outwash Grass Impervious Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTG60H.rnf 0.80 acres I,oading Time Series File: C: \KC SWDM\KC DATA \STOP60H. rnf 0.01 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STOG60H.rnf 0.80 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STEI60H.rnf 1.15 acres Total Area 2.77 acres Peak Discharge: 0.701 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-52.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-S2.tsf LogPearson III Coefficients Time Series File:c-52.tsf Project Location;Sea-Tac Mean~ -0.457 StdDev~ 0.118 Skew~ 0.538 Frequencies & Peaks saved to File:c-52.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-52.tsf Durations & Exceedence Probabilities to File:c-52.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series : c-54.tsf 8./1 SE 14.(" Street -June 2007 ------------- Regional Scale Factor : 1. 00 Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass Impervious Loading Time Series l'ile:C:\KC SWDM\KC DATA\STTI'60H.rnf 0.03 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.03 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 0.83 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOF60H.rnf 0.04 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOP6DH.rnf 0.04 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 1.24 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.44 acres Total Area 3.65 acres Peak Discharge: 0.876 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-S4.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-S4.tsf LogPearson III Coefficients Time Series File:c-54.tsf Project Location:Sea-Tac Mean~ -0.367 StdDev~ 0.117 Skew~ 0.588 Frequencies & Peaks saved to File:c-54.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations IJoading Time Series File:c-S4.tsf Durations & Exceedence Probabilities to File:c-54.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series : c-60.tsf 8·9 SE J 4r Streel-June 2007 Regional Scale Factor : 1. 00 Data Type : Historic Creating Hourly Time Series F'ile Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.52 acres Total Area 0.52 acres Peak Discharge: 0.214 CFS at 0:00 on Oct 6 in 1981 Storing Time Series File:c-60.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-60.tsf LogPearson III Coefficients Time Series File:c-60.tsf Project Location:Sea-Tac Mean~ -0.876 StdDev~ 0.096 Skew~ 0.561 Frequencies & Peaks saved to File:c-60.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Ser1es File:c-60.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-60.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-70.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Pasture Till Grass Outwash Pasture Outwash Grass SE 14r Street -June 2007 Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTP60H.rnf 0.51 aeres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 1.70 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOP60H.rnf 0.34 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 1.13 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 8-10 Impervious 1.34 acres Total Area 5.02 acres Peak Discharge: 1.06 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-70.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-70.tsf LogPearson III Coefficients Time Series File:c-70.tsf Project Location:Sea-Tac Mean~ -0.327 StdDev~ 0.133 Skew= 0.509 Frequencies & Peaks saved to File:c-70.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-70.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-70.dur Analysis Tools Corrunand RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae c-80.tsf 1. 00 Computing Series Regional Scale Factor : Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Outwash Forest Outwash Pasture Outwash Grass SE 14(h Streel ~ June 2007 Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf 5.28 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.12 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 4.35 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOF60H.rnf 0.59 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOP60H.rnf 0.01 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 0.48 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf B·11 Impervious 3.40 acres Total Area 14.23 acres Peak Discharge: 2.61 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-80.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-80.tsf LogPearson III Coefficients Time Series File:c-80.tsf Project Location:Sea-Tac Mean= 0.090 StdDev~ 0.131 Skew~ 0.500 Frequencies & Peaks saved to File:c-80.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-80.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-80.dur 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 c-90.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Impervious Loading Time Series File:C:\KC_SWDM\KC DATA\STEI60H.rnf 0.40 acres Total Area 0.40 acres Peak Discharge: 0.165 CFS at 0:00 on Oct 6 in 1981 SE J 4(h Street -June 2()()7 Storing Time Series File:c-90.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module 8-12 Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-90.tsf LogPearson III Coefficients Time Series File:c-90.tsf Project Location:Sea-Tac Mean~ -0.989 StdDev~ 0.096 Skew~ 0.559 Frequencies & Peaks saved to File:c-90.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-90.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-90.dur 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 c-l00.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC_SWDM\KC_DATA\STTF60H.rnf Till Forest 0.45 acres Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.33 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STTG60H.rnf 0.61 acres Loading Time Series File:C:\KC SWDM\KC_DATA\STEI60H.rnf 0.17 acres Total Area 1.56 acres Peak Discharge: 0.250 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-lOO.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-lOO.tsf LogPearson III Coefficients B-13 SE 144"' Street-June 2007 Time Series File:c-lOO.tsf Project Location:Sea-Tae Mean~ -1.001 StdDev~ 0.167 Skew~ 0.401 ~'requencies & Peaks saved to File:c-lOO.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-lOO.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-lOO.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-106.tsf Regional Scale Factor; 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Outwash Pasture Outwash Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf 2.50 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.12 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 3.34 acres Loading Time Series File: C: \KC SWDM\KC DATA \STOP60H. rnf 0.12 acres Loading Time Series File:C:\KC SWDM\KC DATA\STOG60H.rnf 3.34 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 4.64 acres Total Area 14.06 acres Peak Discharge: 3.02 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-106.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-106.tsf LogPearson III Coefficients Time Series File:c-106.tsf Mean= 0.164 StdDev~ 0.122 S-J4 SE J4.r Street-June 2()()7 Project Location:Sea-Tac Skew~ 0.511 Frequencies & Peaks saved to File:c-106.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-106.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-106.dur 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 c-ll0.tsf Regional Scale Factor: 1.00 Data Type: Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf --Till Forest 6.43 acres Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 12.24 acres Loading Time Series File:C: \KC SWDM\KC DATA \STTG601l. rnf 12.33 acres J"oading Time Series File: C: \KC_ SWDM\KC _DATA \STEI601l. rnf 7.10 acres Total Area 38.10 acres Peak Discharge: 6.91 CFS at 6:00 on Jan 9 in 1990 Storing Time Time Series Computed Series File:c-110.tsf KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-llO.tsf LogPearson III Coefficients Time Series File:c-110.tsf Project Location:Sea-Tac Mean= 0.487 StdDev~ 0.145 Skew~ 0.484 Frequencies & Peaks saved to File:c-ll0.pks Analysis Tools Command Compute Flow DURATION and Exceedence B-15 SE 14.f' Street-June 2007 Loading Time Series File:c-llO.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-110.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series of Runoff Time Series Project Location : Production Sea-Tae c-120.tsf J .00 Computing Series Regional Scale Factor : Data Type : Historic Creating Hourly Time Series File Till Pasture Impervious Loading Time Series File:C:\KC SWDM\KC_DATA\STTP60H.rnf 0.58 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.00 acres Total Area 1.58 acres Peak Discharge: 0.466 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-120.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-120.tsf LogPearson III Coefficients Time Series File:c-120.tsf Project Location:Sea-Tac Mean~ -0.565 StdDev~ 0.101 Skew~ 0.475 Frequencies & Peaks saved to File:c-120.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-120.tsf Durations & Exceedence Probabilities to File:c-120.dur Analysis Tools Command RETURN to Previous Menu B-16 SE 144'" Srreel-June 2007 KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-130.ts£ Regional Scale Factor: 1.00 Data Type ; Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf Till Forest 2.49 acres Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 7.12 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 5.80 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.58 acres Total Area 16.99 acres Peak Discharge: 2.64 CFS at 16:00 on Mar 3 in 1950 Storing Time Series File:c-130.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-130.tsf LogPearson III Coefficients Time Series File:c-l30.tsf Project Location:Sea-Tac Mean= 0.015 StdDev~ 0.175 Skew~ 0.324 Frequencies & Peaks saved to File:c-l30.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-l30.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-130.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series B-17 SE 14.r Street -June 2007 Project Location : Sea-Tac Computing Series c-200.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rllf 4.45 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.14 acres ],oading Time Series File: C: \KC SWDM\KC DATA \STTG60H. rnf 1.79 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.18 acres Total Area 7.56 acres Peak Discharge: 1.12 CFS at 6:00 on Jan 9 in 1990 Storing Time Time Series Computed Series File;c-200.tsf KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge Gurve:c-200.tsf LogPearson III Coefficients Time Series File:e-200.tsf Project Location:Sea-Tac Mean~ -0.308 StdDev~ 0.145 Skew~ 0.500 Frequencies & Peaks saved to File:c-200.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-200.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-200.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-210.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf B·18 SE 144'h Street-June 2007 Till Forest Till Pasture Till Grass Impervious 3.31 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STTP60H.rnf 1.70 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STTG60H.rnf 4.60 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STEI60H.rnf 2.93 acres Total Area 12.54 acres Peak Discharge: 2.47 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-210.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-210.tsf LogPearson III Coefficients Time Series File:c-210.tsf Project Location:Sea-Tac Mean= 0.056 StdDev~ 0.136 Skew~ 0.482 Frequencies & Peaks saved to File:c-710.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-210.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-210.dur 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 c-220.tsf Regional Scale Factor: 1.00 Data Type : IIi storie Creating Hourly Time Series File Till Grass Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 1.56 acres Impervious Loading Time Series File:C:\KC_SWDM\KC DATA\STEI60H.rnf 1.90 acres Total Area 3.46 acres Peak Discharge: 1.09 CFS at 6:00 on Jan 9 in 1990 8-19 SE 14-t Streel-June 2007 Storing Time Series File:c-220.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-220.tsf LogPearson III Coefficients Time Series File:c-220.tsf Project Location:Sea-Tac Mean~ -0.235 StdDev~ 0.114 Skew~ 0.400 Frequencies & Peaks saved to File:c-220.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-220.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-220.dur Analysis Tools Command RETURN to Previous Menu KCRTS Cormnand CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac Computing Series c-230.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Pasture Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 3.95 acres Loading Time Series File:C:\KC_SWDM\KC_DATA\STEI60H.rnf 5.71 acres Total Area 9.66 acres Peak Discharge: 2.72 CFS at 6:00 on Jan 9 in 1990 SE 14.f' Streel-June 2007 Storing Time Series File:c-230.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command 8-20 compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-230.tsf LogPearson III Coefficients Time Series File:c-230.tsf Project Location:Sea-Tac Mean= 0.197 StdDev= 0.103 Skew= 0.461 Frequencies & Peaks saved to File:c-230.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-230.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-230.dur 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 c-232.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf 1.38 acres Total Area 1.38 acres Peak Discharge: 0.093 CFS at 9:00 on Jan 9 in 1990 Storing Time Time Series Computed Series File:c-232.tsf KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-232.tsf LogPearson III Coefficients Time Series File:c-232.tsf Project Location:Sea-Tac Mean~ -1.477 StdDev~ 0.232 Skew= -0.124 Frequencies & Peaks saved to File:c-232.pks Analysis Tools Command Compute Flow DURATION and Exceedence B-21 SE 144'~ Streel-June 2007 Loading Time Series File:c-232.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File~c-232.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-240.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 3.65 acres Loading Time Series '·ile:C:\KC SWDM\KC DATA\STEI60H.rnf 4.48 acres Total Area 8.13 acres Peak Discharge: 2.56 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-240.tsf Time Series Computed KCRTS Corrunand Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-240.tsf LogPearson III Coefficients Time Series File:c-240.tsf Project Location:Sea-Tac Mean= 0.137 StdDev~ 0.114 Skew~ 0.402 Frequencies & Peaks saved to File:c-240.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-240.tsf Durations & Exceedence Probabilities to File:c-240.dur Analysis Tools Command RETURN to Previous Menu B·22 SE 14.r Street -June 2007 KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-241.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF'60H.rnf Till Forest 0.23 acres Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 2.99 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60fl.rnf 3.68 acres Total Area 6.90 acres Peak Discharge: 2.12 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-241.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-211.tsf LogPearson III Coefficients Time Series File:c-241.Lsf Project Location:Sea-Tac Mean= 0.052 StdDev~ 0.114 Skew~ 0.403 Frequencies & Peaks saved to File:c-241.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-241.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-241.dur Analysis Tools Command RETURN to Previous Menu KCRTS Conunand CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series: c-244.tsf B-23 SE /4.(" Street -June 2007 Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Impervious Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTF60H.rnf 0.71 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTP60H.rnf 11.46 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTG60H.rnf 10.75 acres Loading Time Series File:C:\KC SWDM\KC_DATA\STEI60H.rnf 4.68 acres Total Area 27.60 acres Peak Discharge: 5.19 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-244.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-244.tsf LogPearson III Coefficients Time Series File:c-244.tsf Project Location:Sea-Tac Mean= 0.350 StdDev~ 0.151 Skew~ 0.463 Frequencies & Peaks saved to File:c-244.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-244.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-244.dur 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 c-250.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Pasture Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTP60H.rnf 0.17 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 8·24 SE 14,(' Street -June lOO7 Till Grass Impervious 4.66 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 3.23 acres Total Area 8.06 acres Peak Discharge: 2.27 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-250.tsf Time Series Computed KeRTS Corrunand Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-2S0.tsf LogPearson III Coefficients Time Series File:c-250.tsf Project Location:Sea-Tac Mean~ 0.048 StdDev~ 0.126 Skew= 0.396 Frequencies & Peaks saved to File:c-250.pks Analysis Tools Command Compute Flow DURATION and Exceedence Loading Time Series File:c-250.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-250.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-260.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf Till Grass 2.33 acres Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.74 acres Total Area 4.07 acres Peak Discharge: 1.18 CFS at 6:00 on Jan 9 in 1990 SE J 4(h Street -June 2007 Storing Time Series File:c-260.tsf Time Series Computed KCRTS Command B-25 Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-260.tsf LogPearson III Coefficients Time Series File:c-260.tsf Project Location:Sea-Tac Mean~ -0.230 StdDev~ 0.124 Skew~ 0.395 Frequencies & Peaks saved to File:c-260.pks Analys_is Tools Conunand Compute Flow DURATION and Exceedence Loading Time Series File:c-260.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-260.dur Analysis Tools Command RETURN to Previous Menu KCRTS Conunand CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac Computing Series c-270.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 2.22 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 1.60 acres Total Area 3.82 acres Peak Discharge: 1.10 CFS at 6:00 on Jan 9 in 1990 Storing Time Time Series Computed Series File:c-270.tsf KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-270.tsf LogPearson III Coefficients B-26 Sf.: 14¢h Street -June ]007 Time Series File:c-270.ts£ Project Location:Sea-Tac Mean~ -0.263 StdDev~ 0.125 Skew~ 0.392 Frequencies & Peaks saved to File:c-270.pks Analysis Tools Command compute Flow DURATION and Exceedence Loading Time Series File:c-270.tsf Compuling Interval Locations Computing Flow Durations Durations & Exceedenee Probabilities to File:c-270.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-300.tsf Regional Scale Factor: 1.00 Data Type : Historic Creatinq Hourly Time Series File Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf Till Forest 9.47 acres Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 1.73 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STTG60H.rnf 4.13 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STEI60H.rnf 1.56 acres Total Area 16.89 acres Peak Discharge: 2.19 CFS at 6:00 on Jan 9 in 1990 Storing Time Time Series Computed Series File:c-300.tsf KeRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-300.tsf LogPearson III Coefficients Time Series File:c-300.tsf Project Location:Sea-Tac Mean~ -0.057 StdDev~ 0.172 Skew~ 0.335 Frequencies & Peaks saved to File:c-300.pks Analysis Tools Command B·27 SE 14tf Street-June 2007 Compute Flow DURATION and Exceedence Loading Time Series File:c-300.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-300.dur 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 c-304.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC_DATA\STTF60H.rnf 2.12 acres Loading Time Series File:C:\KC_SWDM\KC DATA\STTP60H.rnf 1.36 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTG60H.rnf 5.73 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 3.74 acres Total Area 12.95 acres Peak Discharge: 2.93 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-304.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-304.tsf LogPearson III Coefficients Time Series File:c-304.tsf Project Location:Sea-Tac Mean= 0.141 StdDev~ 0.132 Skew~ 0.426 Frequencies & Peaks saved to File:c-304.pks Analysis Tools Command compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations SE J44'h Street-Ju.ne 2007 Loading Time Series File:c-304.tsf B·28 Durations & Exceedence Probabilities to File:c-304.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae c-306.tsf 1. 00 Computing Series Regional Scale Factor : Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf 1.25 acres Loading Time Series File:C:\KC SWDM\KC DATA\STTP60H.rnf 0.15 acres Loading Time Series File:C:\KC SWDM\KC_DATA\STTG60H.rnf 0.28 acres Loading Time Series File:C:\KC SWDM\KC DATA\STEI60H.rnf 0.08 acres Total Area 1.76 acres Peak Discharge: 0.177 CFS at 6:00 on Jan 9 in 1990 Storing Time Series Yile:c-306.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-306.tsf LogPearson III Coefficients Time Series File:c-306.tsf Project Location:Sea-Tac Mean~ -1.180 StdDev~ 0.204 Skew~ 0.041 Frequencies & Peaks saved to File:c-306.pks Analysis Tools Command compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-306.tsf Durations & Exceedence Probabilities to File:c-306.dur Analysis Tools Command RETURN to Previous Menu B-29 SE 14.(" Street-June 2007 KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series c-310.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Till Forest Loading Time Series File:C:\KC SWDM\KC DATA\STTF60H.rnf 9.32 acres Total Area 9.32 acres Peak Discharge: 0.627 CFS at 9:00 on Jan 9 in 1990 Storing Time Series f'ile:c-310.tsf Time Series Computed KCRTS Conunand Enter the Analysis TOOLS Mcdule Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-310.tsf LogPearson III Coefficients Time Series File:c-310.tsf Project Location:Sea-Tac Mean~ -0.648 StdDev~ 0.233 Skew~ -0.139 Frequencies & Peaks saved to File:c-310.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-310.tsf Durations & Exceedence Probabilities to File:c-310.dur 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 c-320.tsf Regional Scale Factor: 1.00 Data Type : Historic Creating Hourly Time Series File Loading Time Series Fi1e:C:\KC SWDM\KC_DATA\STTF60H.rnf B·30 SE J 4.f' Street -June 2007 Till Forest Till Pasture Till Grass Impervious 8.92 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTP60H.rnf 0.18 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTG60H.rnf 0.33 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STEI60H.rnf 0.09 acres Total Area 9.52 acres Peak Discharge: 0.693 CFS at 9:00 on Jan 9 in 1990 Storing Time Series File:c-320.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-320.tsf LogPearson III Coefficients Time Series File:c-320.tsf Project Location:Sea-Tac Mean~ -0.597 StdDev~ 0.226 Skew~ -0.141 Frequencies & Peaks saved to File:c-320.pks Analysis Tools Command Compute Flow DURATION and Exeeedence Loading Time Series File:c-320.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:c-320.dur Analysis Tools Command RETURN to Previous Menu KCRTS Cormnand CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae c-330.tsf 1. 00 Computing Series Regional Scale Factor : Data Type : Historic Creating Hourly Time Series File Till Forest Till Pasture Till Grass SE 144'" Street-June ]007 Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTF60H.rnf 1.37 acres Loading Time Series Fi1e:C:\KC_SWDM\KC_DATA\STTP60H.rnf 0.34 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STTG60H.rnf 0.62 acres Loading Time Series Fi1e:C:\KC SWDM\KC DATA\STEI60H.rnf B·31 Impervious 0.17 acres Total Area 2.50 acres Peak Discharge: 0.307 CFS at 6:00 on Jan 9 in 1990 Storing Time Series File:c-330.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Flow Frequency Analysis Loading Stage/Discharge curve:c-330.tsf LogPearson III Coefficients Time Series File:c-330.tsf Project Location:Sea-Tac Mean~ -0.930 StdDev~ 0.187 Skew~ 0.198 Frequencies & Peaks saved to File:c-330.pks Analysis Tools Command Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:c-330.tsf Durations & Exceedence Probabilities to File:c-330.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command eXit KCRTS Program B·32 SE 14·l' Street -June 2007 Appendix B.2 KCRTS Pond Designs Hamilton Place -Retention/Detention Facility Type of Facility: Detention Pond Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FE: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice # 1 2 Height (ft) 0.00 2.90 3.00 H: IV 145.91 ft 71.63 ft 10452. sq. ft 19580. sq. ft 0.449 acres 5.00 ft 505.00 ft 70076. cu. ft 1. 609 ac-£t 5.00 12.00 2 Diameter (in) 1. 26 1. 70 ft inches Full Head Discharge (CFS) 0.096 0.114 TOp Notch Weir: None Outflow Rating Curve: None Evendell Plat -Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice # Height (ft) 1 0.00 2 5.50 3 5.90 Top Notch Weir: Outflow Rating Curve: Detention Pond 3.00 1l:1V 167.00 58.00 9686. 23762. 0.546 7.50 452.00 115676. 2.656 7.50 18.00 3 ft ft sq. ft sq. ft acres ft ft cu. ft ac-ft ft inches Full Head Diameter Discharge (in) (CFS) 1. 50 0.167 2.30 0.203 2.80 0.269 None None Liberty Grove -Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: SE J4.f' Street-June 200? Detention Pond 2.00 H:IV 178.12 ft 89.06 ft 8-33 Pipe Diameter (in) 4.0 Pipe Diameter (in) 6.0 6.0 Pond Bottom Area: Top Area at 1 ft. FE: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice # Height (ft) 1 0.00 2 3.65 3 4.81 15863. sq. ft 24128. sq. ft 0.554 acres 6.00 ft 456.00 ft 115567. cu. ft 2.653 ac-ft 6.00 ft 18.00 inches 3 Diameter (in) 3.31 4.39 7.69 Full Head Discharge (CFS) 0.728 0.801 1.749 Top Notch Weir: None Outflow Rating Curve: None Nichol's Place -Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice :# 1 2 Height (ft) 0.00 3.90 Top Notch Weir: Length: Weir Height: Outflow Rating Curve: SE J 44'" Street -June 2007 Detention Pond 0.00 H:1V 82.00 ft 71. 00 ft 5822. sq. ft 5822 . sq. ft 0.134 acres 5.00 ft 447.00 ft 2911 O. cu. ft 0.668 ac-ft 5.00 18.00 2 Diameter (in) 0.87 1. 71 Rectangular 1. 00 4.50 None ft inches Full Head Discharge (CFS) 0.046 0.083 in ft B·34 Pipe Diameter (in) 8.0 10.0 Pipe Diameter (in) 4.0 Appendix B.3 KCRTS Peak Flow Rates Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-10.tsf Mean= -1.641 StdDev~ 0.141 Project Location:Sea-Tac Skew~ 1.196 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 0.022 26 2/16/49 21 :00 0.070 1 89.50 0.989 0.070 1 3/03/50 16: 00 0.016 2 32.13 0.969 0.034 6 2/09/51 2:00 0.044 3 19.58 0.949 0.018 37 10/15/51 13 :00 0.039 4 l4.08 0.929 0.017 44 3/24/53 15:00 0.036 5 10.99 0.909 0.022 27 12/19/53 19:00 0.034 6 9.01 0.889 0.023 21 2/07/55 17:00 0.033 7 7.64 0.869 0.025 15 12/20/55 17: 00 0.031 8 6.63 0.849 0.022 22 12/09/56 l4: 00 0.031 9 5.86 0.829 0.021 28 12/25/57 16: 00 0.030 10 5.24 0.809 0.021 29 1126/59 20:00 0.028 11 4.75 0.789 0.025 17 2/06/60 17:00 0.028 12 4.34 0.769 0.026 13 2/14/61 21:00 0.026 13 3.99 0.749 0.018 38 11/22/61 2:00 0.025 14 3.70 0.729 0.019 34 12115/62 2: 00 0.025 15 3.44 0.709 0.022 23 12/31/63 23:00 0.025 16 3.22 0.690 0.018 39 12/21/64 4:00 0.025 17 3.03 0.670 0.018 40 1(05(66 16: 00 0.024 18 2.85 0.650 0.028 12 1119/67 14:00 0.024 19 2.70 0.630 0.030 10 8(24/68 16:00 0.023 20 2.56 0.610 0.016 46 12(03/68 16:00 0.023 21 2.44 0.590 0.018 41 1/13/70 22: 00 0.022 22 2.32 0.570 0.018 42 12/05/70 9:00 0.022 23 2.22 0.550 0.044 3 2/27/72 7:00 0.022 24 2.13 0.530 0.017 45 1/13/73 2:00 0.022 25 2.04 0.510 0.018 35 11/28/73 9:00 0.022 26 1. 96 0.490 0.023 :<0 12/26/74 23:00 0.022 27 1. 89 0.470 0.016 47 1/14/76 6:00 0.021 28 1. 82 0.450 0.020 30 8(26/77 2:00 0.021 29 1. 75 0.430 0.028 11 9/17/78 2:00 0.020 30 1. 70 0.410 0.025 14 9/08/79 15:00 0.020 31 1. 64 0.390 0.022 25 12114/79 21 :00 0.019 32 1. 59 0.370 0.024 18 11/21/80 11: 00 0.019 33 1. 54 0.350 0.033 7 10/06(81 0:00 0.019 34 1. 49 0.330 0.025 16 10/28(82 16:00 0.018 35 1. 45 0.310 0.020 31 3/15/84 20:00 0.018 36 1. 41 0.291 0.0]7 43 6(06/85 22:00 0.018 37 1. 37 0.271 0.022 24 1/18(86 16: 00 0.018 38 1. 33 0.251 0.031 9 10126/86 0:00 0.018 39 1. 30 0.231 0.015 49 11(11/87 0:00 0.018 40 1.27 0.211 0.019 32 8(21/89 ]7: 00 0.018 41 1. 24 0.191 0.046 2 1/09/90 8:00 0.018 42 1. 21 0.171 0.036 5 11/24/90 8:00 0.0]7 43 1.18 0.151 0.018 36 1/27(92 15:00 0.017 44 1.15 0.131 0.013 50 11/01(92 16:00 0.017 45 1.12 0.111 0.015 48 11(30(93 22:00 0.016 46 1.10 0.091 0.019 33 11/30/94 4:00 0.016 47 1. 08 0.071 0.039 4 2/08/96 10:00 0.015 48 1. 05 0.051 0.031 8 1(02/97 6:00 0.015 49 1. 03 0.031 0.024 19 10/04/97 15:00 0.013 50 1. 01 0.011 B-35 SE 144"Srreef--June2007 Computed Peaks 0.063 100.00 0.990 Computed Peaks 0.053 50.00 0.980 Computed Peaks 0.045 25.00 0.960 Computed Peaks 0.035 10.00 0.900 Computed Peaks 0.034 8.00 0.875 Computed Peaks 0.029 5.00 0.800 Computed Peaks 0.021 2.00 0.500 Computed Peaks 0.018 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-20.tsf Mean= -0.857 StdDev~ 0.119 Project Location:Sea-Tac Skew= 0.941 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks -Rank Return Prob (CFS) (CFS) Period 0.135 24 2/16/49 21:00 0.331 1 89.50 0.989 0.331 1 3/03/50 16: 00 0.258 2 32.13 0.969 0.173 10 2/09/51 2:00 0.222 3 19.58 0.949 0.115 37 10/15/51 13:00 0.218 4 14.08 0.929 0.106 44 3/24/53 15:00 0.210 5 10.99 0.909 0.132 27 12/19/53 19:00 0.197 6 9.01 0.889 0.133 26 2/07/55 17:00 0.195 ) 7.64 0.869 0.139 22 12/20/55 17: 00 0.191 8 6.63 0.849 0.143 18 12/09/56 14:00 0.178 9 5.86 0.829 0.132 28 12/25/57 16: 00 0.173 10 5.24 0.809 0.116 34 1/26/59 20:00 0.170 11 4 . ·15 0.789 0.135 23 2/06/60 17: 00 0.170 12 4.34 0.769 0.140 21 2/14/61 21:00 0.160 13 3.99 0.749 0.114 38 11/22/61 2:00 0.158 11 3.70 0.729 0.114 39 12/15/62 2:00 0.155 15 3.44 0.709 0.135 25 12/31/63 23:00 0.150 16 3.22 0.690 0.115 36 12/21/64 4:00 0.149 17 3.03 0.670 0.114 40 1/05/66 16:00 0.143 18 2.85 0.650 0.170 11 11/13/66 19:00 0.140 19 2.70 0.630 0.191 8 8/24/68 16:00 0.140 20 2.56 0.610 0.103 46 12/03/68 16:00 0.140 21 2.44 0.590 0.113 41 1/13/70 22:00 0.139 22 2.32 0.570 0.111 42 12/05/70 9:00 0.135 23 2.22 0.550 0.222 3 2/27/72 7:00 0.135 24 2.13 0.530 0.104 45 1/13/73 2:00 0.135 25 2.04 0.510 0.116 35 11/28/73 9:00 0.133 26 1.96 0.490 0.119 17 12/26/74 23:00 0.132 27 1. 89 0.470 0.102 47 11/13/75 19:00 0.132 28 1. 82 0.450 0.129 29 8/26/77 2:00 0.129 29 1. 75 0.430 0.178 9 9/17/78 2:00 0.123 30 ]. 70 0.410 0.160 13 9/08/79 15:00 0.122 31 1. 64 0.390 0.140 19 12/14/79 21:00 0.121 32 1. 59 0.370 0.155 15 11/21/80 11: 00 0.117 33 ]. 54 0.350 0.210 5 10/06/81 0:00 0.116 34 1. 4 9 0.330 0.158 14 10128/82 16:00 0.116 35 ]. 45 0.310 0.123 30 3/15/84 20:00 0.115 36 1. 41 0.291 0.110 43 6/06/85 22:00 0.115 37 1. 37 0.271 0.140 20 1/18/86 16:00 0.114 38 1. 33 0.251 0.197 6 10/26/86 0:00 0.114 39 1. 30 0.231 0.094 49 11/11/87 0:00 0.114 40 1.27 0.211 0.122 31 8/21/89 17:00 0.113 41 1. 24 0.191 0.258 2 1/09/90 6:00 0.111 42 1. 21 0.171 0.218 4 11/24/90 8:00 0.110 43 1.18 0.151 0.117 33 1/27/92 15:00 0.106 44 1.15 0.131 8-36 SE 14r STreet-June 2(}{)7 0.086 50 11/01/92 16: 00 0.104 45 1.12 0.111 0.097 48 11/30/93 22 :00 0.103 46 1.10 0.091 0.121 32 11/30/94 4:00 0.102 47 1. 08 0.071 0.195 7 2/08/96 10:00 0.097 48 1. 05 0.051 0.170 12 1/02/97 6:00 0.094 49 1. 03 0.031 0.150 16 10/04/97 15:00 0.086 50 1. 01 0.011 Computed Peaks 0.315 100.00 0.990 Computed Peaks 0.277 50.00 0.980 Computed Peaks 0.242 25.00 0.960 Computed Peaks 0.201 10.00 0.900 Computed Peaks 0.193 8.00 0.875 Computed Peaks 0.171 5.00 0.800 Computed Peaks 0.133 2.00 0.500 Computed Peaks () .112 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File: c-30. tsf Mean""" -0.949 StdDev"" 0.121 Project Location:Sea-Tac Skew= 0.973 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob ICFS) ICFS) Period 0.109 25 2/16/49 21 :00 0.276 1 89.50 0.989 0.276 1 3/03/50 16: 00 0.210 2 32.13 0.969 0.143 9 2/09/51 2:00 0.183 3 19.58 0.949 0.092 37 10/15/51 13:00 0.176 4 14.08 0.929 0.086 44 3/24/53 10:00 0.169 5 10.99 0.909 0.106 27 12/19/53 19:00 0.161 6 9.01 0.889 0.108 26 2/07/55 17: 00 0.158 7 7.64 0.869 0.114 20 12120/55 17:00 0.154 8 6.63 0.849 0.116 18 12/09/56 14: 00 0.143 9 5.86 0.829 0.106 28 12/25/57 16:00 0.143 10 5.24 0.809 0.095 33 1/26/59 20:00 0.139 11 4.75 0.789 0.110 23 2/06/60 17:00 0.137 12 4.34 0.769 0.114 19 2/14/61 21: 00 0.129 13 3.99 0.749 0.092 38 11/22/61 2:00 0.127 14 3.70 0.729 0.092 39 12/15/62 2:00 0.124 15 3.44 0.709 0.109 24 12/31/63 23:00 0.121 16 3.22 0.690 0.093 36 12/21/64 4:00 0.120 17 3.03 0.670 0.091 40 1/05/66 16: 00 O. 116 18 2.85 0.650 0.137 12 11/13/66 19:00 0.114 19 2.70 0.630 0.154 8 8/24/68 16:00 0.114 20 2.56 0.610 0.083 46 12/03/68 16:00 0.113 21 2.44 0.590 0.091 41 1/13/70 22:00 0.113 22 2.32 0.570 0.089 42 12/05/70 9:00 0.110 23 2.22 0.550 0.183 3 2/27/72 7:00 0.109 24 2.13 0.530 0.084 45 1113/73 2:00 0.109 25 2.04 0.510 0.093 35 11/28/73 9:00 0.108 26 1. 96 0.490 0.120 17 12/26/74 23:00 0.106 27 1. 89 0.470 0.082 47 11/13/75 19:00 0.106 28 1. 82 0.450 0.104 29 8/26/77 2:00 0.104 29 1. 75 0.430 0.143 10 9/17/78 2:00 0.099 30 1. 70 0.410 0.129 13 9/08/79 15:00 0.098 31 1. 64 0.390 0.113 21 12114/79 21:00 0.097 32 1. 59 0.370 0.124 15 11/21/80 11: 00 0.095 33 1. 54 0.350 0.169 5 10/06/81 0:00 0.094 34 1. 49 0.330 0.127 14 10/28/82 16: 00 0.093 35 1. 45 0.310 0.099 30 3/15/84 20:00 0.093 36 1. 41 0.291 0.088 43 6/06/85 22:00 0.092 37 1. 37 0.271 0.113 22 1/18/86 16:00 0.092 38 1. 33 0.251 B-37 SF. J 44'h Street -June 2(){)7 0.158 7 10/26/86 0:00 0.092 39 1. 30 0.231 0.076 49 11/11/87 0:00 0.091 40 1.27 0.211 0.098 31 8/21/89 17:00 0.091 41 1. 24 0.191 0.210 2 1/09/90 6:00 0.089 42 1.21 0.171 0.176 4 11/24/90 8:00 0.088 13 1.18 0.151 0.094 34 1/27/92 15:00 0.086 44 1. 15 0.131 0.069 50 11/01/92 16:00 0.084 45 1.12 0.111 0.078 48 11/30/93 22:00 0.083 46 1.10 0.091 0.097 32 11/30/94 4: 00 0.082 47 1. 08 0.071 0.161 6 2/08/96 10:00 0.078 48 1. 05 0.051 0.139 11 1/02/97 6:00 0.076 49 1. 03 0.031 0.121 16 10/04/97 15:00 0.069 50 1. 01 0.011 Computed Peaks 0.259 100.00 0.990 Computed Peaks 0.227 50.00 0.980 Computed Peaks 0.198 25.00 0.960 Computed Peaks 0.163 10.00 0.900 Computed Peaks 0.157 8.00 0.875 Computed Peaks 0.139 5.00 0.800 Computed Peaks 0.107 2.00 0.500 Computed Peaks 0.090 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-40.ts£ Mean= -1.104 StdDev~ 0.105 Project Location:Sea-Tac Skew= 0.664 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.078 21 2/16/49 21:00 0.145 1 89.50 0.989 0.145 1 3/03/50 16: 00 0.135 2 32.13 0.969 0.085 17 2/09/51 2:00 0.124 3 19.58 0.949 0.068 35 10/15/51 13:00 0.121 4 14.08 0.929 0.062 43 3/24/53 15:00 0.116 5 10.99 0.909 0.074 27 12/19/53 19:00 0.112 6 9.01 0.889 0.077 23 11125/54 2:00 0.107 7 7.64 0.869 0.075 26 11/18/55 15:00 0.105 8 6.63 0.849 0.084 18 12/09/56 14:00 0.100 9 5.86 0.829 0.077 22 12/25/57 16:00 0.094 10 5.24 0.809 0.061 44 1/26/59 20:00 0.094 11 4.75 0.789 0.072 28 11120/59 5:00 0.093 12 4.34 0.769 0.072 29 2/14/61 21: 00 0.091 13 3.99 0.749 0.067 37 11/22/61 2: 00 0.089 14 3.70 0.729 0.065 40 12/15/62 2:00 0.088 15 3.44 0.709 0.076 24 12/31/63 23:00 0.088 16 3.22 0.690 0.067 36 12/21/64 4:00 0.085 17 3.03 0.670 0.066 39 1/05/66 16:00 0.084 18 2.85 0.650 0.100 9 11/13/66 19: 00 0.083 19 2.70 0.630 0.112 6 8/24/68 16: 00 0.080 20 2.56 0.610 0.060 45 12/03/68 16:00 0.078 21 2.44 0.590 0.067 38 1/13/70 22:00 0.077 22 2.32 0.570 0.065 41 12/05/70 9:00 0.077 23 2.22 0.550 0.107 7 2/27/72 '7:00 0.076 24 2.13 0.530 0.060 46 1/13/73 2:00 0.076 25 2.04 0.510 0.068 34 11128/73 9:00 0.075 26 1.96 0.490 0.088 15 12/26/74 23:00 0.074 27 1. 89 0.470 0.060 47 11/13/75 19:00 0.072 28 1. 82 0.450 0.076 25 8/26/77 2:00 0.072 29 1. 75 0.430 0.105 8 9/17/78 2:00 0.072 30 1. 70 0.410 0.094 10 9/08/79 15:00 0.071 31 1. 64 0.390 0.083 19 12/14/79 21:00 0.070 32 1. 59 0.370 B-38 SE 144" Street -June 2007 0.091 13 11/21/80 11 :00 0.069 33 1. 54 0.350 0.124 3 10/06/81 0:00 0.068 34 1. 49 0.330 0.093 12 10/28/82 16:00 0.068 35 1. 45 0.310 0.070 32 1/03/84 1:00 0.067 36 1. 41 0.291 0.064 42 6/06/85 22 :00 0.067 37 1. 37 0.271 0.080 20 1/18/86 16:00 0.067 38 1. 33 0.251 o .ll6 5 10/26/86 0:00 0.066 39 1.30 0.231 0.055 49 11/11/87 0:00 0.065 40 1. 27 0.211 0.072 30 8/21/89 17:00 0.065 41 1. 24 0.191 0.135 2 1/09/90 6:00 0.064 42 1. 21 0.171 0.121 4 11/24/90 8: 00 0.062 43 1. 18 0.151 0.069 33 1/27/92 15:00 0.061 44 1. 15 0.131 0.050 50 11/01/92 16:00 0.060 45 1.12 0.111 0.057 48 9/03/94 10:00 0.060 46 1.10 0.091 0.071 31 11130/94 4:00 0.060 47 1. 08 0.071 0.094 11 2/08/96 10:00 0.057 48 1. 05 0.051 0.088 16 1/02/97 6:00 0.055 49 1. 03 0.031 0.089 14 10/04/97 15:00 0.050 50 1. 01 0.011 Computed Peaks 0.154 100.00 0.990 Computed Peaks 0.140 50.00 0.980 Computed Peaks 0.126 25.00 0.960 Computed Peaks 0.108 10.00 0.900 Computed Peaks 0.105 8.00 0.875 Computed Peaks 0.095 5.00 0.800 Computed Peaks 0.077 2. 00 0.500 Computed Peaks 0.065 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-42.tsf Mean= -0.747 StdDev~ o .llO Project Location:Sea-Tac Skew= 0.794 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.175 21 2/16/19 21:00 0.372 1 89.50 0.989 0.372 1 3/03/50 16:00 0.319 2 32.13 0.969 0.207 14 2/09/51 2:00 0.277 3 19.58 0.949 0.151 36 10/15/51 13: 00 0.276 4 14.08 0.929 0.139 44 3/24/53 15:00 0.263 5 10.99 0.909 0.169 28 12/19/53 19: 00 0.259 6 9.01 0.889 0.172 25 11/25/54 2:00 0.251 7 7.64 0.869 0.172 23 12/20/55 17:00 0.234 8 6.63 0.849 0.188 18 12/09/56 14:00 0.230 9 5.86 0.829 0.172 24 12/25/57 16:00 0.224 10 5.24 0.809 0.144 43 1/26/59 20:00 0.210 11 4.75 0.789 0.167 29 2/06/60 17:00 0.209 12 4.34 0.769 0.171 26 2/14/61 21 :00 0.208 13 3.99 0.749 0.149 37 11/22/61 2:00 0.207 14 3.70 0.729 0.147 40 12/15/62 2:00 0.203 15 3.44 0.709 0.174 22 12/31/63 23:00 0.197 16 3.22 0.690 0.151 35 12/21/64 4:00 0.196 17 3.03 0.670 0.149 38 1/05/66 16:00 0.188 18 2.85 0.650 0.224 10 11/13/66 19:00 0.185 19 2.70 0.630 0.251 ') 8/24/68 16:00 0.182 20 2.56 0.610 0.135 46 12/03/68 16:00 0.175 21 2.44 0.590 0.148 39 1/13/70 22:00 0.174 22 2.32 0.570 0.146 41 12/05/70 9:00 0.172 23 2.22 0.550 0.263 5 2/27/72 7:00 0.172 24 2.13 0.530 0.136 45 1/13/73 2:00 0.172 25 2.04 0.510 0.153 34 11/28/73 9:00 0.171 26 1. 96 0.490 8·39 SE 14r Srreef-June 2007 0.196 17 12/26/74 23:00 0.170 27 1. 89 0.470 0.134 47 11/13/75 19:00 0.169 28 1. 82 0.450 0.170 27 8/261T! 2: 00 0.167 29 l. 75 0.430 0.234 8 9/17/78 2: 00 0.160 30 l. 70 0.410 0.210 11 9/08/79 15:00 0.158 31 1. 64 0.390 0.185 19 12/14/79 21:00 0.158 32 1. 59 0.370 0.203 15 11121/80 11: 00 0.154 33 1. 54 0.350 0.276 4 10/06/81 0:00 0.153 34 l. 49 0.330 0.208 13 10128182 16:00 0.151 35 1. 45 0.310 0.158 32 1/03/84 1:00 0.151 36 l. 41 0.291 0.144 42 6/06/85 22:00 0.149 37 l. 37 0.271 0.182 20 1/18/86 16:00 0.149 38 l.33 0.251 0.259 6 10/26/86 0:00 0.148 39 l. 30 0.231 0.124 49 11/11/87 0:00 0.147 40 l.27 0.211 0.160 30 8/21/89 17:00 0.146 41 1. 24 0.191 0.319 2 1/09/90 6:00 0.144 42 1. 21 0.171 0.277 3 11/24/90 8:00 0.144 43 1.18 0.151 0.154 33 1/27/92 15:00 0.139 44 1.15 0.131 0.113 50 11/01192 16: 00 0.136 45 1.12 0.111 0.128 48 11130/93 22:00 0.135 46 1.10 0.091 0.158 31 11/30/94 4:00 0.134 47 1. 08 0.071 0.230 9 2/08/96 10:00 0.128 48 1. 05 0.051 0.209 12 1102/9) 6:00 0.124 49 1. 03 0.031 0.197 16 10/04/97 15:00 0.113 50 1. 01 0.011 Computed Peaks 0.373 100.00 0.990 Computed Peaks 0.334 50.00 0.980 Computed Peaks 0.297 25.00 0.960 Computed Peaks 0.251 10.00 0.900 Computed Peaks 0.243 8.00 0.875 Computed Peaks 0.218 5.00 0.800 Computed Peaks 0.173 2.00 0.500 Computed Peaks 0.147 1. 30 0.23l Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-44.tsf Mean= -0. 596 StdDev~ 0.096 Project Location:Sea-Tac Skew= 0.562 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.253 21 2/16/49 21: 00 0.407 1 89.50 0.989 0.368 6 3/03/50 16:00 0.407 2 32.13 0.969 0.246 25 2/09/51 2:00 0.382 3 19.58 0.949 0.223 34 10/15/51 13:00 0.382 4 14.08 0.929 0.203 43 3/24/53 15:00 0.370 5 10.99 0.909 0.239 28 12/19/53 19:00 0.368 6 9.01 0.889 0.253 22 11125/54 2:00 0.345 7 7.64 0.869 0.247 24 11/18/55 15:00 0.330 8 6.63 0.849 0.278 15 12/09/56 14:00 0.310 9 5.86 0.829 0.254 20 12/25/57 16: 00 0.307 10 5.24 0.809 0.194 47 11/03158 17: 00 0.303 l1 4.75 0.789 0.239 27 11/20/59 5:00 0.300 12 4.34 0.769 0.214 40 2/14/61 21:00 0.292 13 3.99 0.749 0.221 36 11/22/61 2: 00 0.289 14 3.70 0.729 0.211 42 12/15/62 2:00 0.278 15 3.44 0.709 0.244 26 12/31/63 23:00 0.273 16 3.22 0.690 0.221 35 12/21/64 4:00 0.268 17 3.03 0.670 0.219 38 1/05166 16:00 0.262 18 2.85 0.650 0.330 8 11/13/66 19:00 0.260 19 2.70 0.630 0.370 5 8/24/68 16:00 0.254 20 2.56 0.610 B·40 SE 144'" Street -June 2007 0.198 44 12/03/68 16:00 0.253 21 2.44 0.590 0.220 37 1/13/70 22: 00 0.253 22 2.32 0.570 0.215 39 12/05/70 9:00 0.251 23 2.22 0.550 0.303 11 12/08/71 18:00 0.247 24 2.13 0.530 0.197 46 1113173 2: 00 0.246 25 2.04 0.510 0.226 33 11/28/73 9:00 0.244 26 1.96 0.190 0.289 14 12/26/74 23:00 0.239 27 1. 89 0.470 0.198 45 11/13/75 19:00 0.239 28 1. 82 0.450 0.251 23 8/26/77 2:00 0.237 29 1. 75 0.430 0.345 7 9/17/78 2:00 0.234 30 1. 70 0.410 0.310 9 9/08179 15:00 0.231 31 1. 64 0.390 0.273 16 12/14/79 21:00 0.228 32 1. 59 0.370 0.300 12 11/21/80 11: 00 0.226 33 1. 54 0.350 0.407 1 10/06/81 0:00 0.223 34 1. 49 0.330 0.307 10 10/28/82 16:00 0.221 35 1. 45 0.310 0.231 31 1/03/84 1:00 0.221 36 1. 41 0.291 0.213 41 6/06/85 22:00 0.220 37 1. 37 0.271 0.262 18 1/18/86 16: 00 0.219 38 1. 33 0.251 0.382 3 10/26/86 0:00 0.215 39 1. 30 0.231 0.183 49 11/11/87 0:00 0.214 40 1.27 0.211 0.237 29 8/21/89 17: 00 0.213 41 1. 24 0.191 0.407 2 1/09/90 6:00 0.211 42 1.21 0.171 0.382 4 11/24/90 8:00 0.203 43 1.18 0.151 0.228 32 1/27/92 15:00 0.198 44 1.15 0.131 0.166 50 11/01/92 16:00 0.198 45 1.12 0.111 0.189 48 11/30/93 22:00 0.197 46 1.10 0.091 0.234 30 11/30/94 4: 00 0.194 47 1. 08 0.071 0.268 17 2/08/96 10:00 0.189 48 1. 05 0.051 0.260 19 J /02/97 6:00 0.183 49 1. 03 0.031 0.292 13 10/04/97 15:00 0.166 50 1. 01 0.011 Computed Peaks 0.462 100.00 0.990 Computed Peaks 0.425 50.00 0.980 Computed Peaks 0.388 25.00 0.960 Computed Peaks 0.340 10.00 0.900 Computed Peaks 0.330 8.00 0.875 Computed Peaks 0.303 5.00 0.800 Computed Peaks 0.249 2.00 0.500 Computed Peaks 0.214 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-SO.tsf Mean= -0.884 StdDev~ 0.095 Project Location:Sea-Tac Skew= 0.562 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CPS) (CFS) Period 0.130 21 2/16/49 21:00 0.210 1 89.50 0.989 0.190 6 3/03/50 16:00 0.209 2 32.13 0.969 0.127 25 2/09/51 2:00 0.196 3 19.58 0.949 o .ll5 34 10/15/51 13:00 0.196 4 14.08 0.929 0.105 43 3/24/53 15:00 0.191 5 10.99 0.909 0.123 28 12/19/53 19:00 0.190 6 9.01 0.889 0.130 22 11/25/54 2: 00 0.178 7 7.64 0.869 0.127 24 11/18/55 15:00 o .l70 8 6.63 0.849 0.143 15 12/09/56 14: 00 0.160 9 5.86 0.829 0.131 20 12/25/57 16:00 0.158 10 5.24 0.809 0.100 47 11/03/58 17:00 0.156 II 4.75 0.789 0.123 27 11/20/59 5:00 0.154 12 4.34 0.769 o .llO 40 2/14/61 21:00 0.150 13 3.99 0.749 0.114 35 11/22/61 2:00 0.149 14 3.70 0.729 8·41 SE 14.f' Street-June 2007 0.109 42 12/15/62 2:00 0.143 15 3.44 0.709 0.126 26 12/31/63 23:00 0.140 16 3.22 0.690 0.114 36 12/21/64 4:00 0.138 17 3.03 0.670 0.112 38 1/05/66 16;00 0.135 18 2.85 0.650 0.170 8 11/13/66 19:00 0.134 19 2.70 0.630 0.191 5 8124/68 16: 00 0.131 20 2.56 0.610 0.102 44 12/03/68 16: 00 0.130 21 2.44 0.590 0.113 37 1/13170 22:00 0.130 22 2.32 0.570 0.111 39 12/05/70 9:00 0.129 23 2.22 0.550 0.156 11 12/08/71 18:00 0.127 24 2.13 0.530 0.101 46 1/13/73 2:00 0.127 25 2.04 0.510 0.116 33 11/28/73 9:00 0.126 26 I. 96 0.490 0.149 14 12/26/74 23:00 0.123 27 1. 89 0.470 0.102 45 11/13/75 19:00 0.123 28 1.82 0.450 0.129 23 8/26/77 2:00 0.122 29 1. 75 0.430 0.178 7 9/17/78 2:00 0.120 30 1. 70 0.410 0.160 9 9/08/79 15:00 [) .119 31 1. 64 0.390 0.140 16 12/14/79 21:00 0.117 32 1. 59 0.370 0.154 12 11/21/80 11: 00 0.116 33 1. 54 0.350 0.210 1 10/06/81 0:00 0.115 34 1. 4 9 0.330 0.158 10 10/28/82 16:00 0.114 35 1. 45 0.310 0.119 31 1/03/84 1:00 0.114 36 1. 41 0.291 0.110 41 6/06/85 22:00 0.113 37 I .37 0.271 0.135 18 1/18/86 16:00 0.112 38 1. 33 0.251 0.196 3 10/26/86 0:00 0.111 39 1. 30 0.231 0.094 49 11/11/87 0:00 0.110 40 1.27 0.211 0.122 29 8/21/89 17:00 0.11 0 41 1.24 0.191 0.209 2 1/09/90 6;00 0.109 42 1.21 0.1'l1 0.196 4 11/24/90 8:00 0.105 43 1. 18 0.151 0.117 32 1/27/92 15:00 0.102 44 1.15 0.131 0.086 50 11/01/92 16: 00 0.102 45 1.12 0.111 0.097 48 11130/93 22:00 0.101 46 1.10 0.091 0.120 30 11130/94 4:00 0.100 47 1. 08 0.071 0.138 17 2/08/96 10:00 0.097 48 1. 05 0.051 0.134 19 1/02/97 6:00 0.094 49 1. 03 0.031 0.150 13 10/04/97 15:00 0.086 50 1. 01 0.011 Computed Peaks 0.238 100.00 0.990 Computed Peaks 0.219 50.00 0.980 Computed Peaks 0.200 25.00 0.960 Computed Peaks 0.175 10.00 0.900 Computed Peaks 0.170 8.00 0.875 Computed Peaks 0.156 5.00 0.800 Computed Peaks 0.128 2.00 0.500 Computed Peaks 0.110 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-52.tsf Mean= -0.457 StdDev~ 0.118 Project Location:Sea-Tac Skew= 0.538 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.357 21 2/16/49 21:00 0.701 1 89.50 0.989 0.701 1 3/03/50 16: 00 0.669 2 32.13 0.969 0.397 15 2/09/51 2:00 0.592 3 19.58 0.949 0.278 40 10/15/51 13:00 0.563 4 14.08 0.929 0.270 45 3/24/53 15:00 0.500 5 10.99 0.909 0.335 26 12/19/53 19:00 0.488 6 9.01 0.889 0.338 24 11/25/54 2:00 0.484 7 7.64 0.869 0.340 23 12/20/55 17: 00 0.452 8 6.63 0.849 8·42 SE 14-1' Srreef -June 2007 0.394 17 12/09/56 14:00 0.448 9 5.86 0.829 0.345 22 12/25/57 16:00 0.427 10 5.24 0.809 0.267 46 1/26/59 20:00 0.423 11 4.75 0.789 0.333 27 11/20/59 5:00 0.405 12 4.34 0.769 0.317 30 2/14/61 21:00 0.404 13 3.99 0.749 0.289 38 11/22/61 2:00 0.402 14 3.70 0.729 0.299 35 12/15/62 2:00 0.397 15 3.44 0.709 0.336 25 12/31/63 23:00 0.396 16 3.22 0.690 0.295 37 12/21/64 4:00 0.394 17 3.03 0.670 0.298 36 1/05/66 16:00 0.389 18 2.85 0.650 0.452 8 11/13/66 19:00 0.387 19 2.70 0.630 0.488 6 8/24/68 16: 00 0.374 20 2.56 0.610 0.272 42 12/03/68 16:00 0.357 21 2.44 0.590 0.300 34 1/13/70 22: 00 0.345 22 2.32 0.570 0.286 39 12/06/70 8: 00 0.340 23 2.22 0.550 0.500 5 2/27/72 7:00 0.338 24 2.13 0.530 0.265 47 1/13/73 2:00 0.336 25 2.04 0.510 0.320 28 11/28/73 9:00 0.335 26 1.96 o .490 0.423 11 12/26/74 23:00 0.333 27 1. 89 0.470 0.271 43 12/02/75 20:00 0.320 28 1. 82 0.450 0.312 31 8/26/77 2:00 0.319 29 1. 75 0.430 0.427 10 9/17/78 2:00 0.317 30 1. 70 0.410 0.374 20 9/08/79 15:00 0.312 31 1. 64 0.390 0.387 19 12/14/79 21:00 0.310 32 1. 59 0.370 0.404 13 11/21/80 11:00 0.307 33 1. 54 0.350 0.563 4 10/06/81 0:00 0.300 34 1. 49 0.330 0.396 16 10/28/82 16:00 0.299 35 1. 45 0.310 0.319 29 1/03/84 1:00 0.298 36 1. 41 0.291 0.270 44 6/06/85 22:00 0.295 37 1. 37 0.271 0.389 18 1/18/86 16:00 0.289 38 1. 33 0.251 0.484 7 10/26/86 0:00 0.286 39 1. 30 0.231 0.212 49 11/11/87 0:00 0.278 40 1.27 0.211 0.275 41 8/21/89 17:00 0.275 41 1. 24 0.191 0.669 2 1/09/90 6:00 0.272 42 1.21 0.171 0.592 3 11/24/90 8: 00 0.271 43 1.18 0.151 0.310 32 1/27/92 15:00 0.270 44 1.15 0.131 0.199 50 11/01/92 16:00 0.270 45 1.12 0.111 0.232 48 11/30/93 22:00 0.267 46 1.10 0.091 0.307 33 11/30/94 4:00 0.265 47 1. 08 0.071 0.448 9 2/08/96 10:00 0.232 48 1. 05 0.051 0.402 14 1/02/97 6:00 0.212 49 1. 03 0.031 0.405 12 10/04/97 15:00 0.199 50 1. 01 0.011 Computed Peaks 0.729 100.00 0.990 Computed Peaks 0.657 50.00 0.980 Computed Peaks 0.588 25.00 0.960 Computed Peaks 0.501 10.00 0.900 Computed Peaks 0.483 8.00 0.875 Computed Peaks 0.435 5.00 0.800 Computed Peaks 0.341 2.00 0.500 Computed Peaks 0.283 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-54~tsf Mean= -0.367 StdDev~ 0.117 Project Location:Sea-Tac Skew= 0.588 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.437 21 2116/49 21:00 0.876 1 89.50 0.989 0.876 1 3/03/50 16:00 0.818 2 32.13 0.969 8·43 SE 14.r Streel-June 2007 0.493 14 2/09/51 2:00 0.720 3 19.58 0.949 0.345 40 10/15/51 13:00 0.687 4 14.08 0.929 0.332 44 3/24/53 15:00 0.622 5 10.99 0.909 0.411 26 12/19/53 19:00 0.600 6 9.01 0.889 0.415 24 11/25/54 2:00 0.598 7 7.64 0.869 0.420 23 12/20/55 17:00 0.556 8 6.63 0.849 0.480 17 12/09/56 14:00 0.552 9 5.86 0.829 0.422 22 12/25/57 16: 00 0.530 10 5.24 0.809 0.332 45 1/26/59 20: 00 0.513 11 4.75 0.789 0.407 27 11/20/59 5:00 0.498 12 4.34 0.769 0.395 28 2/14/61 21:00 0.494 13 3.99 0.749 0.356 38 11/22/61 2:00 0.493 14 3.70 0.729 0.366 35 12/15/62 2:00 0.493 15 3.44 0.709 0.415 25 12/31/63 23: 00 0.488 16 3.22 0.690 0.363 37 12/21/64 4:00 0.480 17 3.03 0.670 0.365 36 1/05/66 16: 00 0.473 18 2.85 0.650 0.552 9 11/13/66 19: 00 0.470 19 2.70 0.630 0.600 6 8/24/68 16:00 0.466 20 2.56 0.610 0.333 43 12/03/68 16: 00 0.437 21 2.44 0.590 0.367 34 1/13/70 22:00 0.422 22 2.32 0.570 0.350 39 12/06/70 8:00 0.420 23 2.22 0.550 0.622 5 2/27/72 7:00 0.415 24 2.13 0.530 0.327 47 1/13/7 3 2:00 0.415 25 2.04 0.510 0.389 30 11/28/73 9:00 0.411 26 1.96 0.490 0.513 11 12/26/74 23:00 0.407 27 1. 89 0.470 0.332 46 12/02/75 20:00 0.395 28 1. 82 0.450 0.386 31 8/26/77 2:00 0.391 29 1. 75 0.430 0.530 10 9/17/78 2:00 0.389 30 1. 70 0.410 0.466 20 9/08/79 15:00 0.386 31 1. 64 0.390 0.470 19 12/14/79 21:00 0.379 32 1. 59 0.370 0.494 13 11/21/80 11 :00 0.377 33 1. 54 0.350 0.687 4 10/06/81 0:00 0.367 34 1. 4 9 0.330 0.488 16 10/28/82 16: 00 0.366 35 1. 45 0.310 0.391 29 3/15/84 20:00 0.365 36 1. 41 0.291 0.334 42 6/06/85 22:00 0.363 37 1. 37 0.271 0.473 18 1/18/86 16:00 0.356 38 1. 33 0.251 0.598 7 10/26/86 0: 00 0.350 39 1. 30 0.231 0.266 49 11/11/87 0:00 0.345 40 1.27 0.211 0.345 41 8/21/89 17:00 0.345 41 1. 24 0.191 0.818 2 1/09/90 6:00 0.334 42 1. 21 0.171 0.720 3 11/24/90 8:00 0.333 43 1.18 0.151 0.379 32 1/27/92 15: 00 0.332 44 1.15 0.131 0.248 50 11/01/92 16:00 0.332 45 1.12 0.111 0.288 48 11/30/93 22:00 0.332 46 1.10 0.091 0.377 33 11/30/94 4:00 0.327 47 1. 08 0.071 0.556 8 2/08/96 10:00 0.288 48 1. 05 0.051 0.498 12 1/02/97 6:00 0.266 49 1. 03 0.031 0.493 15 10/04/97 15:00 0.248 50 1. 01 0.011 Computed Peaks 0.902 100.00 0.990 Computed Peaks 0.811 50.00 0.980 Computed Peaks 0.724 25.00 0.960 Computed Peaks 0.615 10.00 0.900 Computed Peaks 0.593 8.00 0.875 Computed Peaks 0.534 5.00 0.800 Computed Peaks 0.419 2.00 0.500 Computed Peaks 0.349 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-60.tsf Mean= -0.876 StdDev~ 0.096 Project Location:Sea-Tac Skew= 0.561 8·44 SE /4,f' Street-june 2007 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak -Peaks Rank Return Prob (CFS) (CFS) Period 0.133 21 2/16/49 21 :00 0.214 1 89.50 0.989 0.193 6 3/03/50 16: 00 0.213 2 32.13 0.969 0.129 25 2/09/51 2:00 0.201 3 19.58 0.949 0.117 34 10/15/51 13: 00 0.200 4 14.08 0.929 0.107 43 3/24/53 15:00 0.195 5 10.99 0.909 0.125 27 12/19/53 19: 00 0.193 6 9.01 0.889 0.133 22 11/25/54 2:00 0.181 7 7.64 0.869 0.130 24 11/18/55 15:00 o .l73 8 6.63 0.849 0.146 15 12/09/56 14:00 0.163 9 5.86 0.829 0.133 20 12/25/57 16: 00 0.162 10 5.24 0.809 0.102 47 11/03/58 17:00 0.159 11 4.75 0.789 0.125 28 11/20/59 5:00 0.157 12 4.34 0."169 0.112 40 2/14/61 21 :00 0.153 13 3.99 0.749 0.116 35 11/22/61 2: 00 0.152 14 3.70 0.729 0.111 42 12/15/62 2:00 0.146 15 3.44 0.709 0.128 26 12/31/63 23:00 0.143 16 3.22 0.690 0.116 36 12/21(64 4:00 0.140 17 3.03 0.670 0.115 38 1/05(66 16: 00 0.138 18 2.85 0.6:'0 0.173 8 11/13/66 19: 00 0.137 19 2.70 0.630 0.195 5 8/24/68 16:00 0.133 20 2.56 0.610 0.104 44 12/03/68 16: 00 0.133 21 2.44 0.590 0.116 37 1/13/70 22:00 0.133 22 2.32 0.570 0.113 39 12(05/70 9:00 0.132 23 2.22 0.550 0.159 11 12(08/71 18:00 0.130 24 2.13 0.530 0.103 46 1(13/73 2:00 0.129 25 2.04 0.510 0.118 33 11(28/73 9:00 0.128 26 1. 96 0.490 0.152 14 12/26/74 23:00 0.125 27 1. 89 0.170 0.104 45 11/13/75 19: 00 0.125 28 1. 82 0.450 0.132 23 8/26/77 2:00 0.124 29 1. 75 0.430 0.181 7 9/l7/78 2:00 0.123 30 1. 70 0.410 0.163 9 9/08/79 15:00 0.121 31 1. 64 0.390 0.143 16 12/14/79 21:00 0.120 32 1. 59 0.370 0.157 12 11/21/80 11:00 0.118 33 1. 54 0.350 0.214 1 10/06(81 0:00 0.117 34 1. 49 0.330 0.162 10 10/28/82 16: 00 0.116 35 1. 45 0.310 0.121 31 1/03/84 1:00 0.116 36 1. 41 0.291 0.112 41 6(06/85 22:00 0.116 37 1. 37 0.271 0.138 18 1/18/86 16:00 0.115 38 1. 33 0.251 0.201 3 10126/86 0:00 0.113 39 1. 30 0.231 0.096 49 11/11/87 0:00 0.112 40 1.27 0.211 0.124 29 8/21(89 l7: 00 0.112 41 1. 24 0.191 0.213 2 1/09/90 6: 00 0.111 42 1. 21 0.171 0.200 4 11/24/90 8:00 0.107 43 1.18 0.151 0.120 32 1(27/92 15:00 0.104 44 1.15 0.131 0.087 50 11(01/92 16: 00 0.104 45 1. 12 0.111 0.099 48 11(30/93 22:00 0.103 46 1.10 0.091 0.123 30 11130/94 4:00 0.102 47 1. 08 0.071 0.140 17 2/08/96 10:00 0.099 48 1. 05 0.051 0.137 19 1/02(97 6:00 0.096 49 1. 03 0.031 0.153 13 10/04(97 15:00 0.087 50 1. 01 0.011 Computed Peaks 0.243 100.00 0.990 Computed Peaks 0.223 50.00 0.980 Computed Peaks 0.204 25.00 0.960 Computed Peaks 0.178 10.00 0.900 Computed Peaks 0.173 8.00 0.875 Computed Peaks 0.159 5.00 0.800 B-45 SE 144'h Street-June 2007 Computed Peaks 0.130 2.00 0.500 Computed Peaks 0.112 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-70.tsf Mean= -0.327 StdDev= 0.133 Project Location:Sea-Tac Skew~ 0.509 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --peaks Rank Return Prob (CFS) (CFS) Period 0.492 20 2/16/49 21:00 1. 06 1 89.50 0.989 1. 06 1 3/03/50 16:00 0.988 2 32.13 0.969 0.578 11 2/09/51 2:00 0.861 3 19.58 0.949 0.353 45 1/30/52 8:00 0.781 4 14.08 0.929 0.354 44 3/24/53 15:00 0.729 5 10.99 0.909 0.454 25 12/19/53 19: 00 0.667 6 9.01 0.889 0.470 22 2/07/55 17:00 0.635 7 7.64 0.869 0.485 21 12/20/55 17:00 0.610 8 6.63 0.849 0.549 16 12/09/56 14 :00 0.607 9 5.86 0.829 0.462 23 12/25/57 16: 00 0.604 10 5.24 0.809 0.361 42 1/26/59 20:00 0.578 11 4.75 0.789 0.461 24 11/20/59 5:00 0.568 12 4.34 0.769 0.432 30 2/14/61 21: 00 0.562 13 3.99 0.749 0.376 39 11/22/61 2:00 0.557 14 3.70 0.729 0.411 32 12/15/62 2:00 0.551 15 3.44 0.709 0.451 26 12/31/63 23:00 0.549 16 3.22 0.690 0.389 37 12/21/64 4:00 0.540 17 3.03 0.670 0.402 34 1/05/66 16: 00 0.536 18 2.85 0.650 0.610 8 11/13/66 19: 00 0.508 19 2.70 0.630 0.635 7 8/24/68 16:00 0.492 20 2.56 0.610 0.371 41 12/03/68 16: 00 0.485 21 2.44 0.590 0.405 33 1/13/70 22:00 0.170 22 2.32 0.570 0.396 36 12/06/70 8:00 0.462 23 2.22 0.550 0.729 5 2/27/72 7:00 0.461 24 2.13 0.530 0.355 43 1/13/73 2:00 0.454 25 2.04 0.510 0.441 28 11/28/73 9:00 0.451 26 1.96 0.490 0.604 10 12126174 23:00 0.450 27 1. 89 0.470 0.373 40 12/02/"15 20:00 0.441 28 1. 82 0.450 0.385 38 8/26/77 2:00 0.436 29 1. 75 0.430 0.557 14 9/22/78 19:00 0.432 30 1. 70 0.410 0.450 2"1 9/08/79 15:00 0.416 31 1. 64 0.390 0.536 18 12114/79 21:00 0.411 32 1. 59 0.370 0.540 17 11/21/80 11: 00 0.405 33 1. 54 0.350 0.781 4 10/06/81 15:00 0.402 34 1. 49 0.330 0.508 19 10/28/82 16:00 0.401 35 1. 45 0.310 0.436 29 3115/84 20:00 0.396 36 1. 41 0.291 0.340 46 6/06/85 22:00 0.389 37 1. 37 0.271 0.562 13 1/18/86 16:00 0.385 38 1. 33 0.251 0.607 9 10/26/86 0: 00 0.376 39 1.30 0.231 0.267 49 1/14/88 0:00 0.373 40 1.27 0.211 0.321 47 8/21/89 17:00 0.371 41 1. 24 0.191 0.988 2 1/09/90 6:00 0.361 42 1.21 0.171 0.861 3 11/24/90 8:00 0.355 43 1.18 0.151 0.416 31 1/27/92 15:00 0.354 44 1.15 0.131 0.249 50 12/10/92 6:00 0.353 45 1.12 0.111 0.283 48 11/30/93 22:00 0.340 46 1.10 0.091 0.401 35 11/30/94 4:00 0.321 47 1. 08 0.071 0.667 6 2/08/96 10:00 0.283 48 1. 05 0.051 0.568 12 1/02/97 6:00 0.267 49 1. 03 0.031 0.551 15 10/04/97 15:00 0.249 50 1. 01 0.011 B-46 SE 14¢i' Srreel-June 2007 computed Peaks 1. 08 100.00 0.990 Computed Peaks 0.958 50.00 0.980 Computed Peaks 0.84"7 25.00 0.960 Computed Peaks 0.707 10.00 0.900 Computed Peaks 0.680 8.00 0.875 Computed Peaks 0.604 5.00 0.800 Computed Peaks 0.459 2.00 0.500 Computed Peaks 0.371 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-80.tsf Mean= 0.090 StdDev= 0.131 Project Location:Sea-Tac Skew= 0.500 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 1. 34 18 2/16/49 21: 00 2.61 1 89.50 0.989 2.57 2 3/03/50 16: 00 2.57 2 32.13 0.969 1. 51 11 2/09/51 2:00 2.31 3 19.58 0.949 0.958 41 1/30/52 8:00 2.05 4 14.08 0.929 0.926 44 3/24/53 15:00 1.84 5 10.99 0.909 1.19 25 12/19/53 19:00 1.77 6 9.01 0.889 1. 28 21 2/07/55 17:00 1. 65 7 7.64 0.869 1 .30 20 12/20/55 17:00 1. 59 8 6.63 0.849 1. 48 13 12/09/56 14: 00 1. 58 9 5.86 0.829 1. 20 24 12/25/57 16:00 1. 53 10 5.24 0.809 0.915 45 1/26/59 20:00 1. 51 11 4.75 0.789 1.24 23 11/20/59 5:00 1. 51 12 4.34 0.769 1. 09 31 2/14/61 21:00 1. 48 13 3.99 0.749 0.938 43 11/22/61 2:00 1. 47 14 3.70 0.729 1. 08 32 12/15/62 2:00 1. 41 15 3.44 0.709 1. 19 26 12/31/63 23:00 1. 38 16 3.22 0.690 1. 02 37 12/21/64 4:00 1. 36 17 3.03 0.670 1. 08 34 1/05/66 16: 00 1. 34 18 2.85 0.650 1. 51 12 11113/66 19: 00 1. 34 19 2.70 0.630 1. 59 8 8/24/68 16:00 1. 30 20 2.56 0.610 1. 01 39 12/03/68 16:00 1. 28 21 2.44 0.590 1. 08 33 1/13/70 22:00 1.27 22 2.32 0.570 1. 05 35 12/06/70 8:00 1. 24 23 2.22 0.550 1. 84 5 2/27/72 7:00 1. 20 24 2.13 0.530 0.954 42 1/13/73 2:00 1.19 25 2.04 0.510 1.14 28 11/28/73 9:00 1.19 26 1. 96 0.490 1. 65 7 12/26/74 23:00 1.15 27 1. 89 0.470 1. 02 36 12/02/75 20:00 1.14 28 1. 82 0.450 0.972 40 8/26/77 2:00 1.14 29 1. 75 0.430 1. 38 16 9/22/78 19: 00 1.10 30 1. 70 0.410 1.14 29 9/08/79 15:00 1. 09 31 1. 64 0.390 1.41 15 12/14/79 21:00 1. 08 32 1. 59 0.370 1. 34 19 11/21/80 11:00 1. 08 33 1. 54 0.350 2.05 4 10/06/81 15:00 1. 08 34 1. 49 0.330 1. 27 22 10/28/82 16: 00 1. 05 35 1. 45 0.310 1.15 27 1/03/84 1:00 1. 02 36 1. 41 0.291 0.858 46 6/06/85 22:00 1. 02 37 1. 37 0.271 1. 58 9 1118/86 16: 00 1. 02 38 1. 33 0.251 1. 53 10 10/26/86 0:00 1. 01 39 1. 30 0.231 0.707 49 1/14/88 12:00 0.972 40 1.27 0.211 0.815 47 8/21/89 17:00 0.958 41 1. 24 0.191 2.61 1 1/09/90 6:00 0.954 42 1. 21 0.171 2.31 3 11/24/90 8:00 0.938 43 1. 18 0.151 1.10 30 1/27/92 15:00 0.926 44 1.15 0.131 B·47 SE J 4.r Street -June 2007 0.692 50 3/22/93 22:00 0.915 45 1. 12 0.111 0.717 48 11/30/93 22:00 0.858 46 1.10 0.091 1. 02 38 11/30/94 4:00 0.815 47 1. 08 0.071 1.77 6 2/08/96 10:00 0.717 48 1. 05 0.051 1.47 14 1/02/97 6:00 0.707 49 1.03 0.031 1. 36 17 10/04/97 15:00 0.692 50 1. 01 0.011 Computed Peaks 2.76 100.00 0.990 Computed Peaks 2.47 50.00 0.980 Computed Peaks 2.19 25.00 0.960 Computed Peaks 1. 83 10.00 0.900 Computed Peaks 1. 7 6 8.00 0.875 Computed Peaks 1. 57 5.00 0.800 Computed Peaks 1. 20 2.00 0.500 Computed Peaks 0.973 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-90.tsf Mean= -0.989 StdDev~ 0.096 Project Location:Sea-Tac Skew= 0.559 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks -Rank Return Prob (CFS) (CFS) Period 0.102 21 2/16/49 21:00 0.164 1 89.50 0.989 0.148 6 3/03/50 16:00 0.164 2 32.13 0.969 0.099 25 2/09/51 2:00 0.155 3 19.58 0.949 0.090 34 10/15/51 13: 00 0.155 4 14.08 0.929 0.082 43 3/24/53 15:00 0.150 5 10.99 0.909 0.096 28 12/19/53 19:00 0.148 6 9.01 0.889 0.102 22 11/25/54 2:00 0.139 7 7.64 0.869 0.100 24 11/18/55 15:00 0.133 8 6.63 0.849 0.112 15 12/09/56 14:00 0.125 9 5.86 0.829 0.103 20 12/25/57 16:00 0.124 10 5.24 0.809 0.078 47 11/03/58 17:00 0.123 11 4.75 0."789 0.097 27 11/20/59 5:00 0.121 12 4.34 0.769 0.086 10 2/14/61 21:00 0.118 13 3.99 0.749 0.090 35 11/22/61 2: 00 0.117 14 3.70 0.729 0.085 42 12/15/62 2:00 0.112 15 3.44 0.709 0.099 26 12/31/63 23:00 0.110 16 3.22 0.690 0.089 36 12/21/64 4:00 0.108 17 3.03 0.670 0.088 38 1/05/66 16: 00 0.106 18 2.85 0.650 0.133 8 11/13/66 19:00 0.105 19 2.70 0.630 0.150 5 8/24/68 16:00 0.103 20 2.56 0.610 0.080 44 12/03/68 16:00 0.102 21 2.44 0.590 0.089 37 1/13/70 22:00 0.102 22 2.32 0.570 0.087 39 12/05/70 9:00 0.101 23 2.22 0.550 0.123 11 12/08/71 18:00 0.100 24 2.13 0.530 0.080 46 1/13/73 2:00 0.099 25 2.04 0.510 0.091 33 11/28/73 9:00 0.099 26 1. 96 0.490 0.117 14 12126/74 23:00 0.097 27 1. 89 0.470 0.080 45 11/13/75 19:00 0.096 28 1. 82 0.450 0.101 23 8/26/77 2:00 0.095 29 1. 75 0.430 0.139 7 9/17/78 2:00 0.095 30 1. 70 0.410 0.125 9 9/08/79 15:00 0.093 31 1. 64 0.390 0.110 16 12/14/79 21 :00 0.092 32 1. 59 0.370 0.121 12 11/21/80 11 :00 0.091 33 1. 54 0.350 0.164 1 10/06/81 0:00 0.090 34 1. 49 0.330 0.124 10 10/28/82 16:00 0.090 35 1. 45 0.310 0.093 31 1/03/84 1:00 0.089 36 1. 41 0.291 0.086 41 6/06/85 22 :00 0.089 37 1. 37 0.271 0.106 18 1/18/86 16: 00 0.088 38 1. 33 0.251 8·48 SE 14.f' Streel-June 2007 0.155 3 10/26/86 0:00 0.087 39 1. 30 0.231 0.074 49 11/11/87 0:00 0.086 40 1. 27 0.211 0.095 29 8/21/89 17:00 0.086 41 1. 24 0.191 0.164 2 1/09/90 6:00 0.085 42 1.21 0.171 0.155 4 11/24/90 8:00 o .082 43 1.18 0.151 0.092 32 1/27/92 15:00 0.080 44 1.15 0.131 0.067 50 11/01/92 16:00 0.080 45 1.12 0.111 0.076 48 11130/93 22:00 0.080 46 1.10 0.091 0.095 30 11130/94 4:00 0.078 47 1. 08 0.071 0.108 17 2/08/96 10:00 0.076 48 1. 05 0.051 0.105 19 1/02/97 6:00 0.074 49 1. 03 0.031 0.118 13 10/04/97 15:00 0.067 50 1. 01 0.011 Computed Peaks 0.187 100.00 0.990 Computed Peaks 0.172 50.00 0.980 Computed Peaks 0.157 25.00 0.960 Computed Peaks 0.137 10.00 0.900 Computed Peaks 0.133 8.00 0.875 Computed Peaks 0.122 5.00 0.800 Computed Peaks 0.100 2.00 0.500 Computed Peaks 0.086 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-100.tsf Mean= -1.001 StdDev~ 0.167 Project Location:Sea-Tac Skew= 0.401 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --peaks -Rank Return Prob (CFS) (CFS) Period 0.113 18 2/16/49 21 :00 0.250 1 89.50 0.989 0.250 1 3/03/50 16:00 0.249 2 32.13 0.969 0.l38 9 2/09/51 2:00 0.216 3 19.58 0.949 0.078 38 1130/52 8:00 0.188 4 14.08 0.929 0.069 42 3/24/53 15:00 0.169 5 10.99 0.909 0.096 23 12/19/53 19:00 0.169 6 9.01 0.889 0.113 19 2/07/55 17:00 0.149 7 7.64 0.869 0.117 16 12/20/55 17:00 0.147 8 6.63 0.849 0.127 13 12109/56 14: 00 0.138 9 5.86 0.829 0.091 25 12/25/57 16: 00 0.132 10 5.24 0.809 0.073 41 1/26/59 20:00 0.129 11 4.75 0.789 0.121 14 11/20/59 21: 00 0.129 12 4.34 0.769 0.088 31 2/14/61 21: 00 0.127 13 3.99 0.749 0.068 43 11/22/61 2: 00 0.121 14 3.70 0.729 0.091 28 12/15/62 2:00 0.120 15 3.44 0.709 0.094 26 12/31/63 23:00 0.117 16 3.22 0.690 0.077 39 12/21/64 4:00 0.115 17 3.03 0.670 0.086 34 1/05/66 16: 00 0.113 18 2.85 0.650 0.129 11 1/19/67 14:00 0.113 19 2.70 0.630 0.115 17 8/24/68 16: 00 0.111 20 2.56 0.610 0.084 36 12103/68 16:00 0.105 21 2.44 0.590 0.088 32 1/13/70 22:00 0.105 22 2.32 0.570 0.089 29 ]2/06/70 8:00 0.096 23 2.22 0.550 0.169 5 2/27/72 7:00 0.096 24 2.13 0.530 0.075 40 1/13/73 2:00 0.094 25 2.04 0.510 0.096 24 11/28/73 9:00 0.094 26 1.96 0.490 0.149 ") 12/26/74 23:00 0.093 27 1. 89 0.470 0.086 35 12/02/75 20:00 0.091 28 1. 82 0.450 0.060 45 8/26/77 2:00 0.089 29 1. 75 0.430 0.105 21 9/22/78 19:00 0.088 30 1. 70 0.410 0.064 44 9/08/79 15:00 0.088 31 1. 64 0.390 0.120 15 12/14/79 21 :00 0.088 32 1. 59 0.370 8-49 SE 14¢h Street-June 2007 0.105 22 11/21/80 11:00 0.087 33 1. 54 0.350 0.188 4 10/06/81 15: 00 O. 086 34 1. 49 0.330 0.088 30 10/28/82 16:00 0.086 35 1. 45 0.310 0.093 27 1/03/84 1:00 0.084 36 1. 41 0.291 0.056 48 6/06/85 22: 00 0.081 37 1. 37 0.271 0.147 8 1/18/86 16:00 0.078 38 1. 33 0.251 0.132 10 11/24/86 3:00 0.077 39 1. 30 0.231 0.059 47 1/14/88 12:00 0.075 40 1. 27 0.211 0.055 49 11/05/88 14:00 0.073 41 1. 24 0.191 0.249 2 1/09/90 6:00 0.069 42 1. 21 0.171 0.216 3 11/24/90 8:00 0.068 43 1.18 0.151 0.087 33 1/27/92 15:00 0.064 44 1.15 0.131 0.060 46 3/22/93 22:00 0.060 45 1.12 0.111 0.043 50 11130/93 22:00 0.060 46 1.10 0.091 0.081 37 12/27/94 1:00 0.059 47 1. 08 0.071 0.169 6 2/08/96 10:00 0.056 48 1. 05 0.051 0.129 12 1/02/97 6:00 0.055 19 1. 03 0.031 0.111 20 10/04/97 15:00 0.043 50 1. 0 1 0.011 Computed Peaks 0.273 100.00 0.990 Computed Peaks 0.239 50.00 0.980 Computed Peaks 0.206 25.00 0.960 Computed Peaks 0.166 10.00 0.900 Computed Peaks 0.158 8.00 0.875 Computed Peaks 0.137 5.00 0.800 Computed Peaks 0.097 2.00 0.500 Computed Peaks 0.074 1. 30 0.231 Flow Frequency Analysis LogPearso n III Coefficients Time Series Fi1e:c~106.tsf Mean= 0.164 StdDev= 0.122 Project Location:Sea-Tac Skew= 0.511 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak ~ -Peaks Rank Return Prob (CFS) (CFS) Period 1. 52 20 2/16/49 21 :00 3.02 1 89.50 0.989 3.02 1 3/03/50 16:00 2.88 2 32.13 0.969 1. 73 12 2/09/51 2:00 2.54 3 19.58 0.949 1.13 42 10/15/51 13:00 2.29 4 14.08 0.929 1.12 44 3/24/53 15:00 2.15 5 10.99 0.909 1. 40 27 12/19/53 19: 00 1. 98 6 9.01 0.889 1. 44 n 2/07/55 17 :00 1. 98 7 7.64 0.869 1. 47 22 12/20/55 17:00 1.96 8 6.63 0.849 1.67 15 12/09/56 14:00 1. 84 9 5.86 0.829 1. 43 24 12/25/57 16: 00 1. 80 10 5.24 0.809 1.12 43 1/26/59 20:00 1. 73 11 4.75 0.789 1. 41 25 11120/59 5:00 1. 73 12 4.34 0.769 1. 33 29 2/14/61 21:00 1.72 13 3.99 0.749 1.17 39 11/22/61 2:00 1. 70 14 3.70 0.729 1.25 34 12/15/62 2:00 1. 67 1~ 3.44 0.709 1. 41 26 12/31/63 23:00 1. 65 16 3.22 0.690 1.22 37 12/21/64 4:00 1. 65 17 3.03 0.670 1.25 36 1/05/66 16: 00 1. 62 18 2.85 0.650 1. 84 9 11/13/66 19:00 1. 61 19 2.70 0.630 1. 98 6 8124/68 16:00 1. 52 20 2.56 0.610 1.15 41 12/03/68 16:00 1. 51 21 2.44 0.590 1. 26 33 1/13/70 22:00 1. 47 22 2.32 0.570 1.20 38 12/06/70 8:00 1. 44 23 2.22 0.550 2.15 5 2/27/72 7:00 1. 43 24 2.13 0.530 1.12 45 1113/73 2:00 1. 41 25 2.04 0.510 1. 33 30 11/28/73 9:00 1. 41 26 1.96 0.490 S·50 SE J 4,r Streel-June 2007 1. 80 10 12/26/74 23:00 1. 40 27 1. 89 0.470 1.16 40 12/02/75 20:00 1. 34 28 1. 82 0.450 1. 2 6 32 8/26/77 2:00 1. 33 29 1. 75 0.430 1. 73 11 9/17/78 2:00 1. 33 30 1. 70 0.410 1.51 21 9/08/79 15:00 1.29 31 1. 64 0.390 1. 62 18 12/14/79 21: 00 1. 26 32 1. 59 0.370 1. 65 16 11/21/80 11: 00 1. 26 33 1. 54 0.350 2.29 4 10/06/81 0:00 1. 25 34 1. 4 9 0.330 1. 61 19 10/28/82 16:00 1. 25 35 1. 45 0.310 1. 34 28 1/03/84 1:00 1. 25 36 1. 41 0.291 1.10 47 6/06/85 22:00 1.22 37 1. 3" 0.271 1. 70 14 1/18/86 16: 00 1.20 38 1. 33 0.251 1. 96 8 10/26/86 0:00 1.17 39 1. 30 0.231 0.857 49 11/11/87 0:00 1.16 40 1.27 0.211 1.11 46 8/21/89 17:00 1.15 41 1. 24 0.191 2.88 2 1/09/90 6:00 1.13 42 1. 21 0.171 2.54 3 11/24/90 8:00 1.12 43 1. 18 0.151 1. 29 31 1/27/92 15:00 1.12 11 1. 15 0.131 0.804 50 11/01/92 16:00 1.12 45 1. 12 0.111 0.937 48 11/30/93 22:00 1.11 46 1.10 0.091 1. 25 35 11/30/94 4:00 1.10 47 1. 08 0.071 1. 98 7 2/08/96 10:00 0.937 48 1. 05 0.051 1.72 13 1/02/97 6:00 0.857 49 1. 03 0.031 1. 65 17 10/04/97 15:00 0.804 50 1. 01 O. all Computed Peaks 3.10 100.00 0.990 Computed Peaks 2.79 50.00 0.980 Computed Peaks 2.49 25.00 0.960 Computed Peaks 2.11 10.00 0.900 Computed Peaks 2.04 8.00 0.875 Computed Peaks 1. 83 5.00 0.800 Computed Peaks 1. 42 2.00 0.500 Computed Peaks 1.17 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-110.tsf Mean= 0.487 StdDev= 0.115 Project Location:Sea-Tac Skew= 0.484 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 3.35 20 2116/49 21:00 6.91 I 89.50 0.989 6.79 2 3/03/50 16:00 6.79 2 32.13 0.969 3.89 9 2/09/51 2:00 6.11 3 19.58 0.949 2.38 40 1/30/52 8:00 5.57 4 14.08 0.929 2.21 44 3/24/53 15:00 4.75 5 10.99 0.909 2.95 25 12/19/53 19: 00 4.66 6 9.01 0.889 3.n 22 2/07/55 17: 00 4.31 7 7.64 0.869 3.34 21 12/20/55 17: 00 4.16 8 6.63 0.849 3.77 13 12109/56 14:00 3.89 9 5.86 o .829 2.95 24 12/25/57 16:00 3.86 10 5.24 0.809 2.22 43 1/26159 20:00 3.82 11 4.75 0.789 3.38 19 11/20/59 21 :00 3.80 12 4.34 0.769 2.65 34 2/14/61 21 :00 3.77 13 3.99 0.749 2.27 42 11/22/61 2:00 3.74 14 3.70 0.729 2.73 29 12/15/62 2:00 3.61 15 3.44 0.709 2.91 26 12/31/63 23:00 3.49 16 3.22 0.690 2.47 37 12/21/64 4:00 3.47 17 3.03 0.670 2.66 33 1/05166 16: 00 3.41 18 2.85 0.650 3.86 10 11/13/66 19: 00 3.38 19 2.70 0.630 3.80 12 8/24/68 16:00 3.35 20 2.56 0.610 8·51 SE 14,r Streel-June 2007 2.54 36 12/03/68 16: 00 3.34 21 2.44 0.590 2.70 32 1/13/70 22:00 3.27 22 2.32 0.570 7..70 31 12/06/70 8:00 3.02 23 2.22 0.550 4.75 5 2/27/72 7:00 2.95 24 2.13 0.530 2.34 41 1/13/73 2:00 2.95 25 2.04 0.510 2.88 27 11/28/73 9:00 2.91 26 1.96 0.490 4.31 7 12/26/74 23:00 2.88 27 1. 89 0.470 2.58 35 12/02/75 20:00 2.85 28 1. 82 0.450 2.19 45 8/26/77 2:00 2.73 29 1. 75 0.430 3.47 17 9/22/78 19:00 2.71 30 1. 70 0.410 2.46 39 9/08/79 15:00 2.70 31 1. 64 0.390 3.61 15 12/14/79 21 :00 2.70 32 1. 59 0.370 3.41 18 11/21/80 11: 00 2.66 33 1. 54 0.350 5.57 4 10/06/81 15:00 2.65 34 1. 49 0.330 3.02 23 10/28/82 16:00 2.58 35 1. 45 0.310 2.85 28 1/03/84 1:00 2.54 36 1. 41 0.291 1.97 46 6/06/85 22:00 2.47 37 1.37 0.271 4.16 8 1/18/86 16:00 2.47 38 1. 33 0.251 3.82 11 11/24/86 3:00 2.46 39 1. 30 0.231 1. 79 48 1/14/88 12:00 2.38 40 1. 27 0.211 1. 87 47 11/05/88 14: 00 2.34 41 1. 24 0.191 6.91 1 1/09/90 6:00 2.27 42 1. 21 0.171 6.11 3 11/24/90 8:00 2.22 43 1.18 0.151 2.71 30 1/27/92 15:00 2.21 44 1.15 0.131 1.77 49 3/22/93 22:00 2.19 45 1.12 0.111 1. 58 50 11/30/93 22:00 1. 97 46 1.10 0.091 2.47 38 11/30/94 4:00 1. 87 47 1. 08 0.071 4.66 6 2/08/96 10:00 1. 79 48 1. 05 0.051 3.74 14 1/02/97 6:00 1. 77 49 1. 03 0.031 3.49 16 10/04/97 15:00 1. 58 50 1. 01 0.011 Computed Peaks 7.46 100.00 0.990 Computed Peaks 6.60 50.00 0.980 Computed Peaks 5.78 25.00 0.960 Computed Peaks 4.76 10.00 0.900 Computed Peaks 4.56 8.00 0.875 Computed Peaks 4.01 5.00 0.800 Computed Peaks 2.99 2.00 0.500 Computed Peaks 2.37 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series r·ile:c-120.tsf Mean= -0.565 StdDev= 0.101 Project Location:Sea-Tac Skew= 0.475 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.277 21 2/16/49 21: 00 0.467 1 89.50 0.989 0.426 4 3/03/50 16:00 0.443 2 32.13 0.969 0.280 20 2/09/51 2:00 0.434 3 19.58 0.949 0.231 38 10/15/51 13:00 0.426 4 14.08 0.929 0.214 45 3/24/53 15:00 0.391 5 10.99 0.909 0.258 27 12/19/53 19:00 0.386 6 9.01 0.889 0.272 23 11/25/54 2:00 0.355 7 7.64 0.869 0.262 25 11 /18/ 55 15:00 0.351 8 6.63 0.849 0.306 16 12/09/56 14:00 0.336 9 5.86 0.829 0.272 22 12/25/57 16: 00 0.324 10 5.24 0.809 0.208 47 11/18/58 13:00 0.322 11 4.75 0.789 0.264 24 11/20/59 5:00 0.320 12 4.34 0.769 0.230 39 2/14/61 21: 00 0.315 13 3.99 0.749 0.232 37 11/22/61 2:00 0.313 14 3.70 0.729 B-52 SE 14.f' Street-June 2007 0.230 40 12/15/62 2:00 0.313 15 3.44 0.709 0.262 26 12/31/63 23:00 0.306 16 3.22 0.690 0.235 36 12/21164 4:00 0.300 17 3.03 0.670 0.236 35 1/05/66 16: 00 0.298 18 2.85 0.650 0.355 7 11/13/66 19: 00 0.290 19 2.70 0.630 0.386 6 8/24/68 16: 00 0.280 20 2.56 0.610 0.217 43 12/03/68 16: 00 0.277 21 2.44 0.590 0.238 34 1/13/70 22: 00 0.272 22 2.32 0.570 0.227 41 12/05/70 9:00 0.272 23 2.22 0.550 0.336 9 2/27/72 7:00 0.264 24 2.13 0.530 0.214 46 1/13/73 2:00 0.262 25 2.04 0.510 0.243 32 11128/73 9:00 0.262 26 1. 96 0.490 0.324 10 12/26/74 23:00 0.258 27 1. 89 0.470 0.216 44 12/02/75 20:00 0.258 28 1. 82 0.450 0.258 28 8/26/77 2:00 0.249 29 1. 75 0.430 0.351 8 9/17/78 2:00 0.247 30 1. 70 0.410 0.31 :) 13 9/08/79 15:00 0.244 31 1. 64 0.390 0.298 18 12/14/79 21:00 0.243 32 1.59 0.370 0.322 11 11/21/80 11: 00 0.239 33 1. 54 0.350 0.443 2 10/06/81 0: 00 0.238 34 1. 49 0.330 0.320 12 10/28/82 16:00 0.236 35 1. 45 0.310 0.249 29 1/03/84 1:00 0.235 36 1. 41 0.291 0.220 42 6/06/85 22:00 0.232 37 1. 37 0.271 0.300 17 1/18/86 16:00 0.231 38 1. 33 0.251 0.391 5 10/26/86 0:00 0.230 39 1. 30 0.231 0.185 49 11/11/87 0:00 0.230 40 1. 27 0.211 0.239 33 8/21/89 17: 00 0.227 41 1.24 0.191 0.467 1 1/09/90 6:00 0.220 42 1.21 0.171 0.434 3 11/24/90 8:00 0.217 43 1.18 0.151 0.244 31 1/27/92 15:00 0.216 44 1. 15 0.131 0.169 50 11/01/92 16: 00 0.214 45 1.12 0.111 0.193 48 11130/93 22:00 0.214 46 1. 10 0.091 0.247 30 11/30/94 4:00 0.208 47 1. 08 0.071 0.313 15 2/08/96 10:00 0.193 48 1. 05 0.051 0.290 19 1/02/97 6:00 0.185 49 1. 03 0.031 0.313 14 10/04/97 15:00 0.169 50 1. 01 0.011 Computed Peaks 0.508 100.00 0.990 Computed Peaks 0.466 50.00 0.980 Computed Peaks 0.425 25.00 0.960 Computed Peaks 0.371 10.00 0.900 Computed Peaks 0.360 8.00 0.875 Computed Peaks 0.329 5.00 0.800 Computed Peaks 0.268 2.00 0.500 Computed Peaks 0.227 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File: c-130. tsf Mean= 0.015 StdDev= 0.175 Project Location:Sea-Tac Skew= 0.324 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 1.16 19 2116/49 21:00 2.64 1 89.50 0.989 2.64 1 3/03/50 16: 00 2.63 2 32.13 0.969 1. 47 9 2/09/51 14:00 2.28 3 19.58 0.949 0.811 38 1/30/52 8:00 2.05 4 14.08 0.929 0.694 43 3/24/53 15:00 1. 79 5 10.99 0.909 0.990 23 12119/53 19:00 1. 77 6 9.01 0.889 1.18 17 2/07/55 17: 00 1. 57 7 7.64 0.869 1.22 16 12/20/55 17:00 1. 55 8 6.63 0.849 8-53 SE J 4<f' Sfreel-June 2007 1. 33 13 12/09/56 14: 00 1. 47 9 5.86 0.829 0.967 25 12/25/57 16:00 1. 41 10 5.24 0.809 0.740 41 1/26/59 20:00 1. 35 11 4.75 0.789 1. 31 14 11/20/59 21: 00 1. 34 12 4.34 0.769 0.894 34 2/14/61 21:00 1.33 13 3.99 0.749 0.697 42 11/22/61 2:00 1.31 14 3.70 0.729 0.940 29 12/15/62 2:00 1. 26 15 3.44 0.709 0.961 26 12/31/63 23:00 1. 22 16 3.22 0.690 0.788 39 12/21/64 4:00 1.18 17 3.03 0.670 0.892 35 1/05/66 16:00 1.17 18 2.85 0.650 1. 35 11 1/19/67 14:00 1.16 19 2.70 0.630 1.16 20 8/24/68 16: 00 1.16 20 2.56 0.610 0.869 36 12/03/68 16: 00 1.11 21 2.44 0.590 0.908 30 1/13/70 22:00 1.11 22 2.32 0.570 0.943 28 12/06/70 8: 00 0.990 23 2.22 0.550 l. 77 6 2/27/72 7:00 0.984 24 2.13 0.530 0.778 40 1/13/73 2:00 0.967 25 2.04 0.510 0.984 24 11/28/73 9:00 0.961 26 l. 96 0.490 1. 57 7 12/26/74 23:00 0.961 27 l. 89 0.470 0.897 32 12/02/75 20:00 0.943 28 l. 82 0.450 0.594 47 8/26/77 2:00 0.940 29 1. 75 0.430 l.11 21 9/22/78 19:00 0.908 30 l. 70 0.410 0.607 46 9/08/79 15:00 0.902 31 1. 64 0.390 1.26 15 12/14/79 21:00 0.897 32 l. 59 0.370 1.11 22 11/21/80 11: 00 0.897 33 l. 54 0.350 2.05 4 10/06/81 15:00 0.894 34 l. 49 0.330 0.902 31 1/05/83 8:00 0.892 35 1. 45 0.310 0.961 27 1/03/84 1: 00 0.869 36 1 .41 0.291 0.563 49 6/06/85 23:00 0.847 37 1. 37 0.271 l. 55 8 1/18/86 16:00 0.811 38 l. 33 0.251 1. 41 10 11/24/86 3:00 0.788 39 1. 30 0.231 o . 619 45 1/14/88 12:00 0.778 40 l.27 0.211 0.567 48 11/05/88 14:00 0.740 41 1. 24 0.191 2.63 2 1/09/90 6:00 0.697 42 l. 21 0.171 2.28 3 11/24/90 8:00 0.694 43 l.18 0.151 0.897 33 1/27 /92 15:00 0.632 44 1.15 0.131 0.632 44 3/22/93 22:00 0.619 45 1.12 0.111 0.413 50 11/30/93 22:00 0.607 46 l.10 0.091 0.847 37 12/27/94 1: 00 0.594 47 1. 08 0.071 1. 79 5 2/08/96 10:00 0.567 48 l. 05 0.051 1. 34 12 1/02/97 6:00 0.563 49 1. 03 0.031 1.17 18 10/04/97 15:00 0.413 50 1. 01 0.011 Computed Peaks 2.90 100.00 0.990 Computed Peaks 2.53 50.00 0.980 Computed Peaks 2.18 25.00 0.960 Computed Peaks l. 75 10.00 0.900 Computed Peaks 1. 67 8.00 0.875 Computed Peaks l. 44 5.00 0.800 Computed Peaks 1. 01 2.00 0.500 Computed Peaks 0.759 l. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-200.tsf Mean= -0.308 StdDev~ 0.145 Project Location:Sea-Tac Skew= 0.500 ---Annual Peak Flow Rates--------Flow Frequency Ana!ysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 0.561 18 2/16/49 21:00 1. 12 1 89.50 0.989 l. 09 2 3/03/50 16:00 l. 09 2 32.13 0.969 8·54 SE J 44'~ Street -June 2007 0.660 9 2/09/51 14: 00 0.987 3 19.58 0.949 0.398 39 1/30/52 8: 00 0.834 4 14.08 0.929 0.358 43 3/24/53 15:00 0.795 5 10.99 0.909 0.475 24 12/19/53 19:00 0.777 6 9.01 0.889 0.554 19 2/07/55 17: 00 0.700 7 7.64 0.869 0.562 16 12/20/55 17: 00 0.697 8 6.63 0.849 0.607 13 12/09/56 14:00 0.660 9 5.86 0.829 0.462 25 12/25/57 16: 00 0.626 10 5.24 0.809 0.364 42 1/26/59 20:00 0.623 11 4.75 0.789 0.569 15 11/20/59 21:00 0.615 12 4.34 0.769 0.435 30 2/14/61 21:00 0.607 13 3.99 0.749 0.339 45 11/22/61 2:00 0.574 14 3.70 0.729 0.438 29 12/15/62 2:00 0.569 15 3.44 0.709 0.477 23 12131/63 23:00 0.562 16 3.22 0.690 0.395 40 12/21/64 4:00 0.561 17 3.03 0.670 0.435 31 1/05/66 16: 00 0.561 18 2.85 0.650 0.623 11 1/19/67 14:00 0.554 19 2.70 0.630 0.574 14 8/24/68 16:00 0.502 20 2.56 0.610 0.421 36 12/03/68 16:00 0.500 21 2.44 0.590 0.434 32 1/13/70 22:00 0.494 22 2.32 0.570 0.426 35 12/06/70 8:00 0.477 23 2.27 0.550 0.777 6 2/27/72 7:00 0.475 24 2.13 0.530 0.388 41 1/13/73 2:00 0.462 25 2.04 0.510 0.446 28 11/28/73 9:00 0.459 26 1.96 0.490 0.697 8 12/26/74 23:00 0.457 27 1. 89 0.470 0.427 34 12/02/75 20:00 0.446 28 1. 82 0.450 0.346 44 8/26/77 2:00 0.438 29 1. 75 0.430 0.502 20 9/22/78 19:00 0.435 30 1. 70 0.410 0.401 38 9/08/79 15:00 0.435 31 1. 64 0.390 0.561 l7 12/l4/79 21: 00 0.434 32 1. 59 0.370 0.494 22 11/21/80 11 :00 0.432 33 1. 54 0.350 0.834 4 10/06/81 15:00 0.427 34 1. 49 0.330 0.457 27 10/28/82 16:00 0.426 35 1.45 0.310 0.459 26 1/03/84 1: 00 0.42l 36 1.11 0.291 0.307 46 6/06/85 22:00 0.407 37 1. 37 0.271 0.700 7 1/18/86 16: 00 0.401 38 1. 33 0.251 0.626 10 11/24/86 3:00 0.398 39 1. 30 0.231 0.296 48 1/14/88 12:00 0.395 40 1.27 0.211 0.283 49 8/21/89 l7 :00 0.388 41 1. 24 0.191 1.12 1 1/09/90 6:00 0.364 42 1. 21 o .l71 0.987 3 11/24/90 8:00 0.358 43 1.18 0.151 0.432 33 1/27/92 15:00 0.346 44 1.15 0.131 0.302 47 3/22/93 22:00 0.339 45 1.12 0.111 0.254 50 11/30/93 22:00 0.307 46 1.10 0.091 0.407 37 2/18/95 20:00 0.302 47 1. 08 O. 07l 0.795 5 2/08/96 10:00 0.296 48 1. 05 0.051 0.615 12 1/02/97 6:00 0.283 49 1. 03 0.031 0.500 21 10/04/97 15:00 0.254 50 1. 01 0.011 Computed Peaks 1.21 100.00 0.990 Computed Peaks 1. 06 50.00 0.980 Computed Peaks 0.931 25.00 0.960 Computed Peaks 0.766 10.00 0.900 Computed Peaks 0.733 8.00 0.875 Computed Peaks 0.645 5.00 0.800 Computed Peaks 0.479 2.00 0.500 Computed Peaks 0.380 1.30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-210.tsf Mean= 0.056 StdDev~ 0.136 Project Location:Sea-Tac Skew= 0.482 B-55 SE 144"' Street -June 1007 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (eFS) (eFS) Period 1. 24 19 2/16/49 21 :00 2.48 1 89.50 0.989 2.12 2 3/03/50 16: 00 2.42 2 32.13 0.969 1. 40 11 2/09/51 2:00 2.20 3 19.58 0.949 0.884 40 1/30/52 8:00 1. 97 4 14.08 0.929 0.845 44 3/24/53 15:00 1.72 5 10.99 0.909 1.10 25 12/19/53 19:00 1. 66 6 9.01 0.889 1.19 21 2/07/55 17:00 1. 56 ., 7.64 0.869 1. 21 20 12/20/55 17:00 1. 49 8 6.63 0.849 1. 38 12 12/09/56 14:00 1. 46 9 5.86 0.S29 1.11 24 12/25/57 16:00 1. 43 10 5.24 0.809 0.S35 45 1/26/59 20:00 1. 40 11 4.75 0.789 1.18 22 11/20/59 21: 00 1. 38 12 4.34 0.769 0.996 33 2/14/61 21: 00 1. 37 13 3.99 0.749 O. S 67 43 11/22/61 2:00 1. 37 14 3.70 0.729 1. 01 30 12/15/62 2:00 1. 33 15 3.44 0.709 1. 09 26 12/31/63 23:00 1. 30 16 3.22 0.690 0.936 39 12/21/64 4:00 1. 30 17 3.03 o .670 0.995 34 1/05/66 16: 00 1.27 18 2.80, 0.650 1. 43 10 11/13/66 19: 00 1. 24 19 2.70 0.630 1. 46 9 8/24/68 16: 00 1. 21 20 2.56 0.610 0.937 38 12/03/68 16: 00 1.19 21 2.44 0.590 1. 00 31 1/13/70 22:00 1.18 22 2.32 0.570 0.989 35 12/06/70 8:00 1.16 n 2.22 0.550 1.72 5 2/27/72 7:00 1.11 24 2.13 0.530 0.876 41 1/13/73 2:00 1.10 25 2.04 0.510 1. 08 2"i 11/28/73 9:00 1. 09 26 1.96 0.490 1. 56 7 12/26/74 23:00 1. 08 27 1. 89 0.470 0.949 36 12/02/75 20:00 1. 06 28 1. 82 0.450 0.870 42 8/26/77 2:00 1. 02 29 1.75 0.430 1. 30 16 9/22/78 19: 00 1. 01 30 1. 70 0.410 0.999 32 9/08/79 15:00 1. 00 31 1. 64 0.390 1. 33 15 12/14/79 21:00 0.999 32 1. 59 0.370 1.27 18 11/21/80 11 :00 0.996 33 1. 54 0.350 1. 97 4 10/06/81 15:00 0.995 34 1. 49 0.330 1.16 23 10/28/82 16:00 0.989 35 1. 45 0.310 1. 06 28 1/03/84 1:00 0.949 36 1. 41 0.291 0.775 46 6/06/85 22:00 0.937 37 1. 37 0.271 1. 4 9 8 1/18/86 16: 00 0.937 38 1. 33 0.251 1. 37 13 10/26/86 0:00 0.936 39 1. 30 0.231 0.656 48 1/14/88 12:00 0.884 40 1. 27 0.211 0.712 47 11/05/88 14:00 0.876 41 1. 24 0.191 2.48 1 1/09/90 6:00 0.870 42 1. 21 0.171 2.20 3 11/24/90 8:00 0.867 43 1.18 0.151 1. 02 29 1/27/92 15:00 0.845 44 1.15 0.131 0.643 49 3/22/93 22:00 0.835 45 1.12 0.111 0.636 50 11/30/93 22:00 0.775 46 1.10 0.091 0.937 37 11/30/94 4:00 0.712 47 1. OS 0.071 1. 66 6 2/08/96 10:00 0.656 48 1. 05 0.051 1. 37 14 1/02/97 6:00 0.643 49 1. 03 0.031 1. 30 17 10/04/97 15:00 0.636 50 1. 01 0.011 Computed Peaks 2.63 100.00 0.990 Computed Peaks 2.34 50.00 0.980 Computed Peaks 2.07 25.00 0.960 Computed Peaks 1.72 10.00 0.900 Computed Peaks 1. 66 8.00 0.875 Computed Peaks 1. 47 5.00 0.800 B-56 SE 14(h Street-June 2007 Computed Peaks 1.11 2.00 0.500 Computed Peaks 0.893 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-220.tsf Mean= -0.235 StdDev= 0.114 Project Location:Sea-Tac Skew= 0.400 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.601 21 2116/49 21:00 1. 09 1 89.50 0.989 1. 04 2 3/03/50 16: 00 1. 04 2 32.13 0.969 0.624 19 2/09/51 2:00 0.989 3 19.58 0.949 0.466 40 10/15/51 13:00 0.955 4 14.08 0.929 0.453 44 3/24/53 15:00 0.823 5 10.99 0.909 0.557 26 12119/53 19: 00 0.811 6 9.01 0.889 0.571 23 11/25/54 2:00 0.772 7 7.64 0.869 0.558 25 11118/55 15:00 o .765 8 6.63 0.849 0.672 14 12/09/56 14: 00 0.723 9 5.86 0.829 0.584 22 12/25/57 16:00 0.713 10 5.24 0.809 0.432 47 11118/58 13:00 0.702 11 4.75 0.789 0.567 24 11/20/59 5:00 0.688 12 4.34 0.769 0.501 36 2/14/61 21 :00 0.683 13 3.99 0.749 0.488 38 11/22/61 2:00 0.672 14 3.70 0.729 0.501 35 12/15/62 2:00 0.666 IS 3.44 0.709 0.556 27 12/31/63 23:00 0.660 16 3.22 0.690 0.497 37 12/21/64 4:00 0.658 17 3.03 0.670 0.503 34 1/05/66 16: 00 0.641 18 2.85 0.650 0.765 8 11/13/66 19:00 0.624 19 2.70 0.630 0.823 5 8/24/68 16:00 0.622 20 2.56 0.610 0.460 41 12/03/68 16:00 0.601 21 2.44 0.590 0.508 33 1/13170 22:00 0.584 22 2.32 0.570 0.487 39 12/06/70 8:00 0.571 23 2.22 0.550 0.772 7 2/27/72 7:00 0.567 24 2.13 0.530 0.445 46 1/13/73 2:00 0.558 25 2.04 0.510 0.545 28 11/28/73 9:00 0.557 26 1. 96 0.490 0.723 9 12/26/74 23:00 0.556 27 1. 89 0.470 0.460 42 12/02/75 20:00 0.545 28 1. 82 0.450 0.520 31 8/26/77 2:00 0.540 29 1. 75 0.430 0.713 10 9/17/78 2:00 0.524 30 1. 70 0.410 0.622 20 9/08/79 15:00 0.520 31 1. 64 0.390 0.658 17 12/14/79 21 :00 0.518 32 1. 59 0.370 0.683 13 11/21/80 11: 00 0.508 33 1. 54 0.350 0.955 4 10/06/81 0:00 0.503 34 1. 49 0.330 0.666 15 10/28/82 16: 00 0.501 35 1. 45 0.310 0.540 29 1/03/84 1:00 0.501 36 1. 41 0.291 0.453 45 6/06/85 22 :00 0.497 37 1. 37 0.271 0.660 16 1/18/86 16:00 0.488 38 1. 33 0.251 0.811 6 10/26/86 0:00 0.487 39 1. 30 0.231 0.351 49 11/11/87 0:00 0.466 40 1. 27 0.211 0.455 43 8/21/89 17:00 0.460 41 1. 24 0.191 1. 09 1 1/09/90 6:00 0.460 42 1.21 0.171 0.989 3 11/24/90 8:00 0.455 43 1.18 0.151 0.524 30 1/27/92 15:00 0.453 44 1.15 0.131 0.330 50 11/01/92 16:00 0.453 45 1.12 0.111 0.386 48 11/30/93 22:00 0.445 46 1.10 0.091 0.518 32 11/30/94 4:00 0.432 47 1. 08 0.071 0.702 11 2/08/96 10:00 0.386 48 1. 05 0.051 0.641 18 1/02197 6:00 0.351 49 1. 03 0.031 0.688 12 10/04/97 15:00 0.330 50 1. 01 0.011 B-57 SE 14.f' Street -June 2007 computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Flow Frequency Analysis Time Series File:c-220rd.tsf Proj ect T,ocation: Sea-Tac ---Annual Peak Flow Rates--- Flow Rate (CFS) 0.039 0.110 0.489 0.035 0.099 0.064 0.040 0.159 0.067 0.100 0.040 0.478 0.134 0.035 0.087 0.100 0.138 0.077 0.114 0.082 0.080 0.093 0.087 0.483 0.152 0.090 0.039 0.078 0.031 0.120 0.032 0.277 0.092 0.681 0.080 0.035 0.037 0.141 0.569 0.038 0.035 0.935 0.523 0.093 Rank 38 19 6 43 22 35 36 12 34 21 3·/ 8 16 46 27 20 15 33 18 29 30 23 28 7 13 26 39 32 49 17 48 10 25 2 31 45 41 14 4 40 44 1 5 24 SE 14.f' Street -June ]007 Time of Peak 2122/49 3/05/50 2/09/51 2/04/52 1/18/53 1/07/54 2/08/55 1/06/56 2/26/57 1/17 /58 1/27/59 11120/59 11/24/60 12/24/61 11126/62 11/19/63 11/30/64 1/06/66 12/13/66 1/20/68 12/11/68 1/27/70 12/07/70 3/06/72 12/26/72 1/16/74 1/14/75 12/04/75 8/26/77 12/15/77 2/13/79 12/17/79 12130/80 10/06/81 1/06/83 12/10/83 11/04/84 1/18/86 11/24/86 12/10/87 11/05/88 1/09/90 11/24/90 1/31/92 22:00 6:00 15: 00 8:00 21:00 20:00 22 :00 10:00 4:00 7:00 1:00 21:00 10:00 6:00 10:00 16:00 14:00 21: 00 11 :00 19:00 6:00 2:00 5:00 19: 00 5:00 18:00 2:00 2:00 8:00 17:00 1:00 17:00 16:00 16:00 14:00 21:00 8:00 23: 00 4:00 8:00 23:00 8:00 11: 00 6:00 1.16 1. 05 0.953 0.822 0.795 0.721 0.572 0.474 100.00 50.00 25.00 10.00 8.00 5.00 2.00 1.30 LogPearson III Coefficients Mean~ -0.991 StdDev~ Skew~ 0.698 0.990 0.980 0.960 0.900 0.875 0.800 0.500 0.231 0.418 -----Flow Frequency Analysis------- --Peaks - -Rank Return Prob (CFS) (ft) Period 0.935 5.13 1 89.50 0.681 5.10 2 32.13 0.575 5.08 3 19.58 0.569 5.08 4 14.08 0.523 5.07 5 10.99 0.489 5.06 6 9.01 0.483 5.06 7 7.64 0.478 5.06 8 6.63 0.389 5.04 9 5.86 0.277 5.02 10 5.24 0.160 4.87 11 4.75 0.159 4.86 12 4.34 0.152 4.82 13 3.99 0.141 4.77 14 3.70 0.138 0.134 0.120 0.114 0.110 0.100 0.100 0.099 0.093 0.093 0.092 0.090 0.087 0.087 0.082 0.080 0.080 0.0"78 0.077 0.067 0.064 0.040 0.040 0.039 0.039 0.038 0.037 0.037 0.035 0.035 B·58 4.75 4.73 4.63 4.58 4.54 4.41 4.41 4.38 4.30 4.29 4.28 4.26 4.22 4.21 4.15 4.13 4.13 4.11 4.10 4.02 4.01 3.85 3.78 3.71 3.67 3.49 3.16 3.13 3.01 3.00 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 3.44 3.22 3.03 2.85 2.70 2.56 2.44 2.32 2.22 2.13 2.04 1.96 1. 89 1. 82 1. 75 1. 70 1. 64 1. 59 1. 54 1. 49 1. 45 1. 41 1. 37 1. 33 1. 30 1.27 1. 24 1. 21 1.18 1. 15 0.989 0.969 0.949 0.929 0.909 0.889 0.869 0.849 0.829 0.809 0.789 0.769 0.749 0.729 0.709 0.690 0.670 0.650 0.630 0.610 0.590 0.570 0.550 0.530 0.510 0.490 0.470 0.450 0.430 0.410 0.390 0.370 0.350 0.330 0.310 0.291 0.271 0.251 0.231 0.211 0.191 0.171 0.151 0.131 0.034 47 1/26/93 5:00 0.035 2.92 45 1.12 0.111 0.030 50 2/17/94 23:00 0.035 2.90 46 1.10 0.091 0.160 11 12/27/94 6:00 0.034 2.75 47 1. 08 0.071 0.575 3 2/08/96 11: 00 0.032 2.43 48 1. 05 0.051 0.389 9 1/02/97 10:00 0.031 2.31 49 1. 03 0.031 0.037 42 1/25/98 0: 00 0.030 2.22 50 1. 01 0.011 Computed Peaks 1. 55 5.20 100.00 0.990 Computed Peaks 1. 04 5.15 50.00 0.980 Computed Peaks 0.678 5.10 25.00 0.960 Computed Peaks 0.368 5.04 10.00 0.900 Computed Peaks 0.323 5.03 8.00 0.875 Computed Peaks 0.219 5.01 5.00 0.800 Computed Peaks 0.091 4.27 2.00 0.500 Computed Peaks 0.048 3.96 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-230.tsf Mean= 0.197 StdDev~ 0.103 Project Location:Sea-Tac Skew= 0.461 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (eFS) (eFS) Period 1. 60 21 7./16/49 21:00 2.72 1 89.50 0.989 2.49 4 3/03/50 16: 00 2.57 2 32.13 0.969 1. 64 20 2/09/51 2:00 2.53 3 19.58 0.949 1. 32 40 10/15/51 13:00 2.49 4 14.08 0.929 1. 23 46 3/24/53 15:00 2.24 5 10.99 0.909 1. 49 27 12/19/53 19:00 2.22 6 9.01 0.889 1.57 22 11/25/54 2:00 2.05 7 7.64 0.869 1. 52 25 11/18/55 15:00 2.00 8 6.63 0.849 1.TI 16 12/09/56 14:00 1. 96 9 5.86 0.829 1.57 23 12/25/57 16: 00 l. 88 10 5.24 0.809 1. 21 47 11/18/58 13:00 l. 86 11 4.75 0.789 1.54 24 11/20/59 5:00 l. 84 12 4.34 0.769 1. 33 38 2/14/61 21:00 1. 83 13 3.99 0.749 1. 33 37 11/22/61 2:00 1. 81 14 3.70 0.729 1. 33 39 12/15/62 2:00 1. 80 15 3.44 0.709 1. 52 26 12/31/63 23:00 1. 77 16 3.22 0.690 1. 36 36 12/21/64 4:00 1.75 l7 3.03 0.670 1. 37 34 1/05/66 16:00 1. 73 18 2.85 0.650 2.05 7 11/13/66 19:00 1. 68 19 2.70 0.630 2.22 6 8/24/68 16:00 l. 64 20 2.56 0.610 1. 26 42 12/03/68 16:00 1. 60 21 2.44 0.590 1. 38 33 1/13/70 22:00 1. 57 22 2.32 0.570 1. 31 41 12/06/70 8:00 1. 57 23 2.22 0.550 1.96 9 2/27/72 7:00 l. 54 24 2.13 0.530 1. 24 45 1/13/73 2:00 1. 52 25 2.04 0.510 1.40 32 11/28/73 9:00 1. 52 26 1. 96 0.490 1. 88 10 12/26/74 23:00 1. 4 9 27 1. 89 0.470 1.25 44 12/02/75 20:00 1. 47 28 1. 82 0.450 1. 47 28 8/26/77 2:00 1. 44 29 1. 75 0.430 2.00 8 9/17/78 2:00 1. 42 30 1. 70 0.410 1. 80 15 9/08/79 15:00 1. 41 31 1. 64 0.390 1. 7 3 18 12/14/79 21:00 1. 40 32 1. 59 0.370 1. 86 11 11121/80 11 :00 1. 38 33 1.54 0.350 2.57 2 10/06/81 0:00 1. 37 34 1. 49 0.330 1. 84 12 10128/82 16:00 1. 36 35 1. 45 0.310 1. 44 29 1/03/84 1:00 1. 36 36 1. 41 0.291 1. 2 6 43 6/06/85 22: 00 1. 33 37 1.3" 0.271 1. 75 17 1/18/86 16:00 1. 33 38 1. 33 0.251 8·59 SE 14.f' Street -June 2007 2.24 5 1. 05 49 1. 36 35 2.72 1 2.53 3 1.41 31 0.962 50 1.10 48 1.12 30 1. 83 13 1. 68 19 1.81 14 Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks 10/26/86 11/11/87 8/21/89 1/09/90 11/24/90 1/27/92 11/01/92 11/30/93 11/30/94 2/08/96 1/02/97 10/04/97 0:00 0:00 17:00 6:00 8:00 15:00 16:00 22:00 4: 00 10:00 6:00 15:00 1. 33 1. 32 1. 31 1. 26 1. 26 1. 25 1. 24 1. 23 1. 21 1. 10 1. 05 0.962 2.95 2.70 2.46 2.15 2.09 1. 91 1. 55 1. 31 39 40 41 42 43 44 45 46 47 48 49 50 1. 30 1.27 1. 24 1. 21 1.18 1.15 1.12 1.10 1. 08 1. 05 1. 03 1. 01 100.00 50.00 25.00 10.00 8.00 5.00 2.00 1. 30 0.231 0.211 0.191 0.171 0.151 0.131 o .l11 0.091 0.071 0.051 0.031 0.011 0.990 0.980 0.960 0.900 0.875 0.800 0.500 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-230rd.tsf Mean= -0.774 StdDev= 0.235 Project Location:Sea-Tac Skew= 1.289 ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.118 0.141 0.559 0.108 0.130 0.130 0.129 0.247 0.129 0.136 0.119 0.478 0.142 0.104 0.132 0.136 0.218 0.125 0.136 0.127 0.125 0.132 0.134 0.480 0.219 0.135 0.125 0.131 0.105 0.138 0.102 0.471 39 17 1 46 29 30 32 11 33 20 38 6 15 48 26 21 13 37 22 34 35 27 25 4 12 23 36 28 47 19 49 7 SE J 4¢1' Street--June 2007 2/22/49 3/05/50 2/09/51 2/04/52 1/23/53 1/06/54 2/08/55 1/06/56 2/26/57 1/17/58 1/24/59 11/21/59 11/24/60 12/24/61 11/27/62 11/19/63 12/01/64 1/07/66 12/15/66 1/20/68 12/11/68 1/27/70 12/07/70 3/06/72 12/27 /72 1116/74 12/27 /74 12/04/75 8/26/77 12/15/77 2/12/79 12/17/79 6:00 11: 00 20:00 6:00 8:00 12:00 8:00 12:00 4:00 8:00 16:00 3:00 17:00 6: 00 5:00 18:00 8:00 3:00 8:00 21: 00 7: 00 4: 00 11: 00 22:00 18:00 19:00 10:00 3:00 7:00 21: 00 17: 00 20:00 -----Flow Frequency Analysis------- --Peaks - -Rank Return Prob (CFS) (ft) Period 0.559 7.00 1 89.50 0.550 6.95 2 32.13 0.484 6.59 3 19.58 0.480 6.57 4 14.08 0.479 6.56 5 10.99 0.478 6.56 6 9.01 0.471 6.53 7 7.64 0.452 6.45 8 6.63 0.407 0.291 0.247 0.219 0.218 0.176 0.142 0.142 0.141 0.140 0.138 0.136 0.136 0.136 0.135 0.135 0.134 0.132 0.132 0.131 0.130 0.130 0.130 0.129 8·60 6.27 6.03 5.94 5.76 5.75 5.62 5.42 5.40 5.33 5.27 5.16 5.01 4.96 4.96 4.90 4.89 4.83 4.68 4.68 4.62 4.54 4.54 4.54 4.48 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 5.86 5.24 4.75 4.34 3.99 3.70 3.44 3.22 3.03 2.85 2.70 2.56 2.44 2.32 2.22 2.13 2.04 1. 96 1. 89 1. 82 1. 75 1. 70 1. 64 1. 59 0.989 0.969 0.949 0.929 0.909 0.889 0.869 0.849 0.829 0.809 0.789 0.769 0.749 0.729 0.709 0.690 0.670 0.650 0.630 0.610 0.590 0.570 0.550 0.530 0.510 0.490 0.470 0.450 0.430 0.410 0.390 0.370 0.130 31 12/30/80 22 :00 0.129 4.46 33 l. 54 0.350 0.291 10 10/06/81 19: 00 0.127 4.31 34 l. 49 0.330 0.135 24 1/08/83 3:00 0.125 4.18 35 l. 45 0.310 0.111 44 12/10/83 19:00 0.125 4.18 36 l. 41 0.291 0.117 40 11/04/84 0:00 0.125 4.17 37 1. 37 0.271 0.176 14 1/19/86 7:00 0.119 3.78 38 1. 33 0.251 0.407 9 11/24/86 8:00 0.118 3.72 39 1. 30 0.231 0.114 41 12/09/87 22:00 0.117 3.68 40 1. 27 0.211 0.113 43 11/05/88 22:00 0.114 3.53 41 1. 24 0.191 0.484 3 1/09/90 14:00 0.113 3.46 42 1.21 0.171 0.452 8 4/05/91 6:00 0.113 3.40 43 1.18 0.151 0.140 18 1131/92 22: 00 0.111 3.33 44 1.15 0.131 0.109 45 3/23/93 12:00 0.109 3.22 15 1.12 0.111 o. a 98 50 2/17/94 21: 00 0.108 3.15 46 1.10 O. 091 0.142 16 12/27/94 20:00 0.105 2.98 47 1. 08 0.071 0.550 2 2/09/96 4: 00 0.104 2.94 48 1. as 0.051 0.479 5 1/02/97 12:00 0.102 2.76 49 1. 03 0.031 0.113 42 10/30/97 11: 00 0.098 2.59 50 1. 01 0.011 computed Peaks 0.953 7.57 100.00 0.990 Computed Peaks 0.711 7.51 50.00 0.980 Computed Peaks 0.526 6.81 25.00 0.960 Computed Peaks 0.347 6.09 10.00 0.900 Computed Peaks 0.320 6.07 8.00 0.875 Computed Peaks 0.249 5.94 5.00 0.800 Computed Peaks 0.150 5.55 2.00 0.500 Computed Peaks 0.111 3.30 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-232.tsf Mean= -1. 477 StdDev~ 0.232 Project Location:Sea-Tac Skew~ -0.124 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 0.041 16 2/16/49 22:00 0.093 1 89.50 0.989 0.080 5 3/03/50 16:00 0.088 2 32.13 0.969 0.088 2 2/09/51 18:00 0.083 3 19.58 0.949 0.028 32 1/30/52 9:00 0.082 4 14.08 0.929 0.021 42 1/18/53 19:00 0.080 5 10.99 0.909 0.031 27 1/06/54 5:00 0.068 6 9.01 0.889 0.054 10 2/07/55 21:00 0.065 7 7.64 0.869 0.046 13 12/20/55 17 :00 0.059 8 6.63 0.849 0.036 21 12/09/56 15:00 0.055 9 5.86 0.829 0.038 20 1/16/58 20:00 0.054 10 5.24 0.809 0.032 24 1/24/59 2:00 0.054 11 4.75 0.789 0.059 8 11/20/59 21:00 0.047 12 4.34 0.769 0.032 22 2/24/61 15:00 0.046 13 3.99 0.749 0.019 44 1/03/62 1:00 0.045 14 3.70 0.729 0.026 36 11/25/62 14:00 0.042 15 3.44 0.709 0.032 25 1/01/64 18:00 0.041 16 3.22 0.690 0.022 39 11130/64 12:00 0.040 17 3.03 0.670 0.024 38 1/06/66 3:00 0.040 18 2.85 0.650 0.054 11 1/19/67 14: 00 0.039 19 2.70 0.630 0.032 23 2/03/68 23:00 0.038 20 2.56 0.610 0.031 28 12/03/68 17:00 0.036 21 2.44 0.590 0.026 34 1/13/70 23:00 0.032 22 2.32 0.570 0.021 41 12/06/70 8:00 0.032 23 2.22 0.550 0.065 7 2/28/72 3:00 0.032 24 2.13 0.530 0.029 30 1113/73 5:00 0.032 25 2.04 0.510 0.031 26 1/15/74 2:00 0.031 26 1.96 0.490 B·61 SF: 14.f' Streer -June 2007 0.047 12 12/26/74 23:00 0.031 27 1. 89 0.470 0.029 29 12/03/75 17:00 0.031 28 1. 82 0.450 0.004 50 3/24/77 20:00 0.029 29 1. 75 0.430 0.025 37 12/10/77 17: 00 0.029 30 1. 70 0.410 0.015 46 2/12/79 8:00 0.028 31 1. 64 0.390 0.040 17 12/15/79 8:00 0.028 32 1. 59 0.370 0.022 40 12/26/80 4:00 0.027 33 1.54 0.350 0.040 18 10/06/81 15:00 0.026 34 1. 49 0.330 0.039 19 1/05/83 8:00 0.026 35 1. 45 0.310 0.026 35 1/24/84 11: 00 0.026 36 1. 41 0.291 0.012 48 2/11/85 5:00 0.025 37 1. 37 0.271 0.068 6 1/18/86 21 :00 0.024 38 1. 33 0.251 0.055 9 11/24/86 4:00 0.022 39 1. 30 0.231 0.071 43 1/14/88 13:00 0.022 40 1.27 0.211 0.013 47 1/05/89 16:00 0.021 41 1. 24 0.191 0.093 1 1109/90 9:00 0.021 42 1. 21 0.171 0.082 4 4/05/91 2:00 0.021 43 1.18 0.151 0.027 33 1/27/92 17:00 0.019 44 1.15 0.131 0.028 31 3/23/93 0:00 0.016 45 1.12 0.111 0.008 49 3/03/94 4:00 0.015 46 1.10 0.091 0.042 15 2/19/95 20:00 0.013 47 1. 08 0.071 0.083 3 2/09/96 1: 00 0.012 48 1. 05 0.051 0.045 11 1/02/97 9:00 0.008 49 1. 03 0.031 0.016 45 1/07/98 9:00 0.004 50 1. 01 0.011 Computed Peaks 0.110 100.00 0.990 Computed Peaks 0.097 50.00 0.980 Computed Peaks 0.083 25.00 0.960 Computed Peaks 0.066 10.00 0.900 Computed Peaks 0.062 8.00 0.875 Computed Peaks 0.053 5.00 0.800 Compuled Peaks 0.034 2.00 0.500 Computed Peaks 0.022 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c~240.tsf Mean= 0.137 StdDev= 0.114 Project Location:Sea~Tac Skew= 0.402 ~~~Annual Peak Flow Rates~~~ ~~~--Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 1. 42 21 2/16/19 21: 00 2.57 1 89.50 0.989 2.44 2 3/03/50 16:00 2.44 2 32.13 0.969 1. 47 19 2/09/51 2:00 2.33 3 19.58 0.949 1.10 40 10/15/51 13:00 2.25 4 14.08 0.929 1.07 44 3/24/53 15:00 1. 94 5 10.99 0.909 1. 31 25 12/19/53 19: 00 1. 91 6 9.01 0.889 1. 34 23 11/25/54 2:00 1. 82 7 7.64 0.869 1. 31 26 11/18/55 15:00 1. 80 8 6.63 0.849 1. 58 14 12/09/56 14:00 1. 70 9 5.86 0.829 1. 38 22 12/25/57 16:00 1. 68 10 5.24 0.809 1. 02 47 11/18/58 13:00 1. 65 11 4.75 0.789 1. 33 24 11/20/59 5:00 1. 62 12 4.34 0.769 1.18 35 2/14/61 21:00 1. 61 13 3.99 0.749 1.15 38 11/22/61 2:00 1.58 14 3.70 0.729 1.18 36 12/15/62 2:00 1. 57 15 3.44 0.709 1. 31 27 12/31/63 23:00 1. S5 16 3.22 0.690 1.17 37 12/21/64 4:00 1. 55 17 3.03 0.670 1.18 34 1/05/66 16:00 1. 51 18 2.85 0.650 1. 80 8 11/13/66 19:00 1. 47 19 2.70 0.630 1. 94 S 8/24/68 16:00 1. 46 20 2.56 0.610 B·62 SE 14.f' Street -June 2007 1.08 41 1.20 33 1.15 39 1.82 7 1.05 46 1. 28 28 1.70 9 1.08 42 1.23 31 1. 68 10 1.46 20 1. 55 17 1. 61 13 2.25 4 1.57 15 1.27 29 1.07 45 1.55 16 1.91 6 0.828 49 1.07 43 2.57 1 2.33 3 1.23 30 0.778 50 0.911 48 1.22 32 1. 65 11 1. 51 18 1.62 12 Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks 12/03/68 1/13/70 12/06/70 2/27 /72 1113/73 11/28/73 12/26/74 12/02/75 8/26/77 9/17/78 9/08/79 12114/79 11/21/80 10/06/81 10/28/82 1/03/84 6/06/85 1/18/86 10/26/86 11/11/87 8/21/89 1/09/90 11/24/90 1/27/92 11/01192 11/30/93 11 /30 /94 2/08/96 1102/97 10/04/97 16:00 22:00 8:00 7:00 2:00 9:00 23:00 20:00 2:00 2:00 15:00 21: 00 11: 00 0:00 16:00 1:00 22: 00 16:00 0:00 0:00 17: 00 6:00 8:00 15:00 16: 00 22:00 4:00 10:00 6:00 15:00 1. 42 1. 38 1. 34 1. 33 1. 31 1. 31 1. 31 1. 28 1. 27 1. 23 1. 23 1.22 1.20 1.18 1.18 1.18 1.17 1.15 1. 15 1. 10 1. 08 1. 08 1. 07 1. 07 1. 07 1. 05 1. 02 0.911 0.828 0.778 2.72 2.48 2.24 1. 94 1. 87 1. 70 1. 35 1.12 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Flow Frequency Analysis LogPearson III Coefficients 2.44 2.32 2.22 2.13 2.04 1.96 1. 89 1. 82 1. 75 1. 70 1. 64 1. 59 1. 54 1. 49 1.45 1. 41 1. 37 1. 33 1. 30 1.27 1.24 1.21 1.18 1.15 1.12 1.10 1. 08 1. 05 1. 03 1. 01 100.00 50.00 25.00 10.00 8.00 5.00 2.00 1. 30 0.590 0.570 0.550 0.530 0.510 0.490 0.470 0.450 0.430 0.410 0.390 0.370 0.350 0.330 0.310 0.291 0.2)1 0.251 0.231 0.211 0.191 0.171 0.151 0.131 0.111 0.091 0.071 0.051 0.031 0.011 0.990 0.980 0.960 0.900 0.875 0.800 0.500 0.231 Time Series File:c-240rd.tsf Mean= -0.255 StdDev= 0.169 Project Location:Sea-Tac Skew= 1.275 ---Annual Flow Rate (CFS) 0.471 0.524 1. 34 0.416 0.432 0.484 0.570 0.533 0.512 0.487 0.459 1.15 0.490 0.382 Peak Flow Rates--- Rank Time of Peak 30 18 1 44 40 25 l1 16 19 24 32 7 23 47 2/17/49 3/04/50 2/09/51 1/30/52 9/30/53 1/06/54 2/08/55 12/22/55 12/09/56 1/16/58 10/19/58 l1/20/59 11/20/60 1/03/62 1:00 4: 00 19:00 l1: 00 17:00 7:00 0:00 15:00 18:00 23:00 9:00 23:00 16:00 3:00 SE ]4.(' Street-June 2007 -----Flow Frequency Analysis------- --Peaks - - (CFS) (ft) 1.34 4.97 1.26 4.89 1.26 4.89 1.21 4.79 1.21 4.79 1.16 4.63 1.15 4.61 1.08 4.43 0.998 4.20 0.943 4.08 0.570 3.66 0.565 3.61 0.553 3.46 0.543 3.34 8·63 Rank Return Period 1 89.50 2 32.13 3 19.58 4 14.08 5 10.99 6 9.01 7 7.64 8 6.63 9 5.86 10 5.24 11 4.75 12 4.34 13 3.99 14 3.70 Prob 0.989 0.969 0.949 0.929 0.909 0.889 0.869 0.849 0.829 0.809 0.789 0.769 0.749 0.729 0.483 27 11/25/62 16:00 0.535 3.24 15 3.44 0.709 0.473 28 1/01/64 20:00 0.533 3.22 16 3.22 0.690 0.499 21 11/24/64 10: 00 0.528 3.16 17 3.03 0.670 0.421 43 12/28/65 17:00 0.524 3.11 18 2.85 0.650 0.543 14 1/19/67 19:00 0.512 2.96 19 2.70 0.630 0.442 38 2/19/68 4:00 0.508 2.92 20 2.56 0.610 0.471 29 12/03/68 22:00 0.499 2.82 21 2.44 0.590 0.469 31 1/14/70 14:00 0.497 2.80 22 2.32 0.570 0.508 20 12/06/70 14: 00 0.490 2.73 23 2.22 0.550 0.998 9 2/28/72 7:00 0.487 2.69 24 2.13 0.530 0.440 39 12/26/72 6:00 0.484 2.65 25 2.04 0.510 0.448 36 1/15/74 8: 00 0.483 2.65 26 1. 96 0.490 0.553 13 12/27/74 6:00 0.483 2.64 27 1. 89 0.470 0.497 22 12/04/75 1:00 0.473 2.53 28 1. 82 0.450 0.359 49 8/24/77 0:00 0.471 2.51 29 1. 75 0.430 0.483 26 9/23/78 11 :00 0.471 2.51 30 1.70 0.410 0.387 46 11/19/78 8: 00 0.469 2.48 31 1. 64 0.390 0.943 10 12/15/79 9:00 0.459 2.38 32 1. 59 0.370 0.426 42 11/21/80 14:00 0.457 2.36 33 1. 54 0.350 1.26 3 10/06/81 17:00 0.455 2.34 34 1. 49 0.330 0.528 17 1/05/83 15:00 0.450 2.30 35 1. 45 0.310 0.409 45 1/21/84 13: 00 0.448 2.28 36 1.41 0.291 0.455 34 6/07/85 7:00 0.444 2.24 37 1. 37 0.271 1. 08 8 1/18/86 22:00 0.442 2.21 38 1. 33 0.251 1.16 6 11/24/86 7:00 0.140 2.20 39 1. 30 0.231 0.42"1 41 1/14/88 19:00 0.432 2.11 40 1. 27 0.211 0.368 48 11/05/88 19: 00 0.427 2.06 41 1. 24 0.191 1.26 2 1/09/90 11: 00 0.426 2.05 42 1.21 0.171 1.21 4 4/05/91 3:00 0.421 2.01 43 1.18 0.151 0.444 37 1/28/92 10:00 0.416 1. 96 44 1.15 0.131 0.450 35 3/23/93 5:00 0.409 1. 89 45 1.12 o .1l1 0.333 50 12/01/93 16:00 0.387 1. 70 46 1. 10 0.091 0.535 15 2/19/95 22:00 0.382 1. 66 47 1. 08 0.071 1.21 5 2/09/96 3:00 0.368 1.53 48 1.05 o .051 0.565 12 1/02/97 12:00 0.359 1. 4 6 49 1. 03 0.031 0.457 33 10/30/97 9:00 0.333 1. 26 50 1. 01 O. OIl Computed Peaks 1. 93 5.23 100.00 0.990 Computed Peaks 1. 56 5.10 50.00 0.980 Computed Peaks 1. 26 4.89 25.00 0.960 Computed Peaks 0.935 4.07 10.00 0.900 Computed Peaks 0.881 3.99 8.00 0.875 Computed Peaks 0.736 3.89 5.00 0.800 Computed Peaks 0.512 2.97 2.00 0.500 Computed Peaks 0.411 1. 91 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-241.tsf Mean= 0.052 StdDev~ 0.114 Project Location:Sea-Tac Skew= 0.403 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 1.17 21 2/16/49 21:00 2.12 1 89.50 0.989 2.02 2 3/03/50 16: 00 2.02 2 32.13 0.969 1.21 19 2/09/51 2: 00 1. 93 3 19.58 0.949 0.902 40 10/15/51 13: 00 1. 85 4 14.08 0.929 0.879 44 3/24/53 15:00 1. 59 5 10.99 0.909 1. 08 25 12/19/53 19: 00 1. 57 6 9.01 0.889 1.11 23 11/25/54 2:00 1. 50 7 7.64 0.869 1. 08 26 11/18/55 15:00 1. 48 8 6.63 0.849 B-64 SE 14.f' Street -June 2007 1. 30 14 12/09/56 14:00 1. 40 9 5.86 0.829 1.13 22 12/25/57 16:00 1. 38 10 5.24 0.809 0.838 47 11/18/58 13: 00 1.37 11 4.75 0.789 1.10 24 11/20/59 5:00 1.33 12 4.34 0.769 0.972 36 2/14/61 21: 00 1. 32 13 3.99 0.749 0.943 39 11/22/61 2:00 1. 30 14 3.70 0.729 0.973 35 12115/62 2:00 1. 2 9 15 3.44 0.709 1. 08 27 12/31/63 23:00 1. 29 16 3.22 0.690 0.964 37 12/21/64 4:00 1. 27 l7 3.03 0.670 0.976 34 1/05/66 16:00 1.24 18 2.85 0.650 1.48 8 11/13/66 19:00 l.21 19 2.70 0.630 l. 59 5 8/24/68 16:00 l. 20 20 2.56 0.610 0.893 42 12/03/68 16:00 1.17 21 2.44 0.590 o . 985 33 1/13/70 22:00 1.13 22 2.32 0.570 0.945 38 12/06/70 8:00 l.11 23 2.22 0.550 1. 50 7 2/27/72 7:00 1.10 24 2.13 0.530 0.864 46 1/13/73 2:00 1. 08 25 2.04 0.510 1. 06 28 11/28/73 9:00 1. 08 26 l. 96 0.490 l. 40 9 12/26/74 23:00 1. 08 27 l. 89 0.470 0.894 41 12/02/75 20:00 1.06 28 1. 82 0.450 l. 01 31 8/26/77 2:00 1. 05 29 l. 75 0.430 1. 38 10 9117/78 2:00 1. 02 30 1. 70 0.410 l. 20 20 9/08/79 15:00 1. 01 31 1. 64 0.390 1.27 17 12/14/79 21:00 1. 00 32 1. 59 0.370 l. 32 13 11/21/80 11:00 O. 98" 33 1. 54 0.350 l. 85 4 10/06/81 0:00 0.976 34 1. 49 0.330 l.29 IS 10/28/82 16: 00 0.973 35 1. 45 0.310 l. 05 29 1/03/81 1: 00 0.972 36 1. 41 0.291 0.877 45 6/06/85 22: 00 0.964 37 l. 37 0.271 1. 29 16 1/18/86 16:00 0.945 38 l. 33 0.251 1. 57 6 10/26/86 0:00 0.943 39 l. 30 0.231 o . 680 49 11/11/87 0: 00 0.902 40 1.27 0.211 0.881 43 8/21/89 17:00 0.894 41 1. 24 0.191 2.12 I 1/09/90 6:00 0.893 42 1.21 0.171 1. 93 3 11124/90 8: 00 0.881 43 1.18 0.151 1. 02 30 1/27/92 15:00 0.879 44 loIS 0.131 0.639 50 11/01/92 16: 00 0.877 45 1.12 0.111 0.748 48 11/30/93 22: 00 0.864 46 1. 10 0.091 1. 00 32 11/30/94 4:00 0.838 47 1. 08 0.071 l. 37 11 2/08/96 10:00 0.748 48 1. 05 0.051 1. 24 18 1/02/97 6:00 o .680 49 1.03 0.031 1. 33 12 10/04/97 15:00 0.639 50 1. 01 0.011 Computed Peaks 2.25 100.00 0.990 Computed Peaks 2.05 50.00 0.980 Computed Peaks 1. 85 25.00 0.960 Computed Peaks 1. 60 10.00 0.900 Computed Peaks 1. 54 8.00 0.875 Computed Peaks 1. 40 5.00 0.800 Computed peaks l.11 2.00 0.500 Computed Peaks 0.920 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-244.tsf Mean= 0.350 StdDev~ 0.151 Project Location:Sea-Tac Skew= 0.463 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 2.13 21 2/16/49 21: 00 5.19 1 89.50 0.989 5.15 2 3/03/50 16: 00 5.15 2 32.13 0.969 8·65 SE 144'" Street -June 2007 2.87 10 2/09/51 2:00 4.57 3 19.58 0.949 1. 72 39 1/30/52 8:00 4.21 4 14.08 0.929 1.58 44 3/24/53 15:00 3.54 5 10.99 0.909 2.15 25 12/19/53 19: 00 3.44 6 9.01 0.889 2.38 22 2/07/55 17:00 3.19 7 7.64 0.869 2.45 20 12/20/55 17:00 3.06 8 6.63 0.849 2.78 12 12/09/56 14:00 2.89 9 5.86 0.829 2.16 24 12125157 16:00 2.87 10 5.24 0.809 1. 61 43 1/26/59 20:00 2.82 11 4.75 0.789 2.49 19 11/20/59 2l :00 2.78 12 4.34 0.769 1. 93 33 2/14/61 2l:00 2.76 13 3.99 0.749 1. 65 42 11/22/61 2:00 2.74 14 3.70 0.729 2.00 29 12/15/62 2:00 2.68 15 3.44 0.709 2.10 27 12/31/63 23:00 2.63 16 3.22 0.690 1. 78 38 12/21/64 4:00 2.57 17 3.03 0.670 1. 93 34 1/05/66 16: 00 2.53 18 2.85 0.650 2.89 9 11/13/66 19: 00 2.49 19 2.70 0.630 2.76 13 8/24/68 16: 00 2.45 20 2.56 0.610 1. 83 36 12/03/68 16: 00 2.43 2l 2.44 0.590 1. 96 32 1/13/70 22:00 2.38 22 2.32 0.570 2.00 30 12/06/70 8:00 2.18 23 2.22 0.550 3.54 5 2/27/72 7:00 2.16 24 2.13 0.530 1. 68 40 1/13/73 2:00 2.15 25 2.04 0.510 2.14 26 11/28/73 9:00 2.14 26 1. 96 0.490 3.19 7 12/26/74 23:00 2.10 27 1. 89 0.470 1. 87 35 12/02/75 20:00 2.08 28 1. 82 0.450 1. 53 45 8/26/77 2:00 2.00 29 1. 7 5 0.430 2.57 17 9/22/78 19: 00 2.00 30 1. 70 0.410 1. 67 41 9/08/79 15:00 1.97 31 1. 64 0.390 2.68 15 12/14/79 21: 00 1. 96 32 1. 59 0.370 2.53 18 11/21/80 11 :00 1. 93 33 1. 54 0.350 4.21 4 10/06/81 15:00 1. 93 34 1. 49 0.330 2.1S 23 10/28/82 16: 00 1. 87 35 1. 45 0.310 2.0S 28 1/03184 1: 00 l. 83 36 1. 41 0.291 1. 40 46 6/06/85 22: 00 1.79 37 1. 37 0.271 3.06 8 1/18/86 16:00 1. 78 38 1. 33 0.251 2.82 11 11/24/S6 3:00 1. 72 39 1. 30 0.231 1. 30 48 1/14/88 12:00 1. 68 40 l.27 0.211 1. 36 47 11/05/88 14:00 1. 67 41 1.24 0.191 5.19 1 1/09/90 6:00 1. 65 42 1. 21 0.171 4.57 3 11/24/90 8:00 1. 61 43 1.18 0.151 1. 97 31 1/27/92 15:00 1. 58 44 1.15 0.131 1.28 49 3/22/93 22:00 1. 53 45 1.12 0.111 1. 09 50 11/30/93 22:00 l. 40 46 1.10 0.091 1. 79 37 11130/94 4:00 1. 36 47 1. 08 0.071 3.44 6 2/0S/96 10:00 1. 30 48 1. 05 0.051 2.74 14 1/02/97 6:00 1. 28 49 1. 03 0.031 2.63 16 10/04/97 15:00 1. 09 50 1. 01 0.011 Computed Peaks 5.65 100.00 0.990 Computed Peaks 4.97 50.00 0.980 Computed Peaks 4.33 25.00 0.960 Computed Peaks 3.54 10.00 0.900 Computed Peaks 3.39 8.00 0.875 Computed Peaks 2.97 5.00 0.800 Computed Peaks 2.18 2.00 0.500 Computed Peaks 1. 71 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-250.tsf Mean= 0.048 StdDev~ 0.126 Project Location:Sea-Tac Skew= 0.396 8-66 SE 14.f' Street-June ]007 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 1.18 20 2116/49 21: 00 2.27 1 89.50 0.989 2.21 2 3/03/50 16:00 2.21 2 32.13 0.969 1. 27 18 2/09/51 2:00 2.02 3 19.58 0.949 0.844 44 10115/51 13:01l 1. 88 4 14.08 0.929 0.855 42 3/24/53 15:00 1. 58 5 10.99 0.909 1. 08 26 12/19/53 19:00 1. 55 6 9.01 0.889 1. 09 25 11/25/54 2:00 1. 48 7 7.64 0.869 1.10 23 12/20/55 17:00 1. 4 8 8 6.63 0.849 1. 33 14 12/09/56 14: 00 1. 46 9 5.86 0.829 1.12 21 12/25/57 16:00 1. 45 10 5.24 0.809 0.817 46 1/26/59 20:00 1. 35 11 4.75 0.789 1.11 22 11/20/59 5:00 1. 34 12 4.34 0.769 0.972 33 2114/61 21: 00 1. 33 13 3.99 0.749 0.912 39 11/22/61 2:00 1. 33 14 3.70 0.729 0.982 31 12/15/62 2:00 1. 30 15 3.44 0.709 1. 06 28 12/31/63 23:00 1. 30 16 3.22 0.690 0.941 37 12/21/64 4:00 1. 28 17 3.03 0.670 0.967 35 1/05/66 16: 00 1. 27 18 2.85 0.650 1. 48 8 11/13/66 19:00 1. 23 19 2.70 0.630 1.55 6 8/24/68 16:00 1.18 20 2.56 0.610 0.889 41 12/03/68 16:00 1. 12 21 2.44 0.590 0.979 32 1/13/70 22: 00 1.11 22 2.32 0.570 0.954 36 12/06/70 8:00 1.10 23 2.22 0.550 1.58 5 2/27/72 7: 00 1. 09 24 2.13 0.530 0.845 43 1113/73 2:00 1. 0 9 25 2.04 0.510 1. 08 27 11/28/73 9:00 1. 08 26 1. 96 0.490 1. 4 6 9 12/26/74 23:00 1. 08 27 1. 89 0.470 0.895 40 12/02/75 20:00 1. 06 28 1. 82 0.450 0.936 38 8/26/77 2:00 1. 05 29 1. 75 0.430 1. 35 11 9/22/78 19:00 1. 01 30 1. 70 0.410 1. 09 24 9/08/79 15:00 0.982 31 1. 64 0.390 1. 30 16 12/14/79 21: 00 0.979 32 1. 59 0.370 1. 30 15 11/21/80 11 :00 0.972 33 1. 54 0.350 1. 88 4 10/06/81 15:00 0.972 34 1. 49 0.330 1.23 19 10/28/82 16: 00 0.967 35 1. 45 0.310 1. 05 29 1/03/84 1:00 0.954 36 1. 41 0.291 0.828 45 6/06/85 22:00 0.941 37 1. 37 0.271 1. 33 13 1/18/86 16:00 0.936 38 1. 33 0.251 1. 48 7 10/26/86 0:00 0.912 39 1. 30 0.231 0.646 49 1/14/88 0:00 0.895 40 1.27 0.211 0.774 47 8/21/89 17:00 0.889 41 1. 24 0.191 2.27 1 1/09/90 6:00 0.855 42 1.21 0.171 2.02 3 11/24/90 8:00 0.845 43 1.18 0.151 1. 01 30 1/27/92 15:00 0.844 44 1.15 0.131 0.600 50 12/10/92 6:00 0.828 45 1.12 0.111 0.689 48 11/30/93 22 :00 0.817 46 1.10 0.091 0.972 34 11/30/94 4: 00 0.774 47 1. 08 0.071 1. 45 10 2/08/96 10:00 0.689 48 1. 05 0.051 1. 28 17 1/02/97 6:00 0.646 49 1. 03 0.031 1. 34 12 10/04/97 15:00 0.600 50 1. 01 0.011 Computed Peaks 2.39 100.00 0.990 Computed Peaks 2.16 50.00 0.980 Computed Peaks 1. 93 25.00 0.960 Computed Peaks 1. 64 10.00 0.900 Computed Peaks 1. 58 8.00 0.875 Computed Peaks 1. 42 5.00 0.800 B·67 SE 14-t' Srreel-June 2007 computed Peaks 1.10 2.00 0.500 Computed Peaks 0.893 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-260.tsf Mean= -0.230 StdDev~ 0.124 Project Location:Sea-Tac Skew= 0.395 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.617 20 2/16/49 21:00 1.18 1 89.50 0.989 1.14 2 3/03/50 16:00 1.14 2 32.13 0.969 0.660 18 2/09/51 2:00 1. 05 3 19.58 0.949 0.449 43 10/15/51 13 :00 0.977 4 14.08 0.929 0.452 42 3/24/53 15:00 0.824 5 10.99 0.909 0.567 26 12/19/53 19:00 0.819 6 9.01 0.889 0.572 25 11/25/54 2: 00 0.788 7 7.64 0.869 0.574 24 12/20/55 17:00 0.777 8 6.63 0.849 0.695 13 12/09/56 14:00 0.760 9 5.86 0.829 0.590 21 12/25/57 16:00 0.752 10 5.24 0.809 0.430 46 11/18/58 13:00 0.711 11 4.75 0.789 0.581 23 11/20/59 5:00 0.704 12 4.34 0.769 0.511 34 2/14/61 21:00 0.695 13 3.99 0.749 0.483 39 11/22/61 2:00 0.695 14 3.70 0.729 0.515 31 12/15/62 2:00 0.687 15 3.44 0.709 0.561 28 12/31/63 23:00 0.681 16 3.22 0.690 0.497 38 12/21/64 4:00 0.668 17 3.03 0.670 0.509 35 1/05/66 16:00 0.660 18 2.85 0.650 0.777 8 11/13/66 19:00 0.655 19 2.70 0.630 0.819 6 8/24/68 16:00 0.617 20 2.56 0.610 o .467 41 12/03/68 16:00 0.590 21 2.44 0.590 0.515 32 1/13/70 22: 00 0.584 22 2.32 0.570 0.500 36 12/06/70 8:00 0.581 23 2.22 0.550 0.824 5 2/27/72 7:00 0.574 24 2.13 0.530 0.445 44 1/13/73 2:00 0.572 25 2.04 0.510 0.564 27 11/28/73 9:00 0.567 26 1.96 0.490 0.760 9 12/26/74 23:00 0.564 27 1. 89 0.470 0.470 40 12/02/75 20:00 0.561 28 1. 82 0.450 0.499 37 8/26/77 2:00 0.550 29 1. 75 0.430 0.711 11 9/22/78 19:00 0.531 30 1. 70 0.410 0.584 22 9/08/79 15:00 0.515 31 1. 64 0.390 0.681 16 12/14/79 21:00 0.515 32 1. 59 0.370 0.687 15 11/21/80 11 :00 0.514 33 1. 54 0.350 0.977 4 10/06/81 15:00 0.511 34 1. 4 9 0.330 0.655 19 10/28/82 16:00 0.509 35 1. 45 0.310 0.550 29 1/03/84 1:00 0.500 36 1. 41 0.291 0.440 45 6/06/85 22:00 0.499 37 1. 37 0.271 0.695 14 1/18/86 16:00 0.497 38 1. 33 0.251 0.788 7 10/26/86 0:00 0.483 39 1. 30 0.231 0.343 49 1/14/88 0:00 0.470 40 1.27 0.211 0.417 47 8/21/89 17:00 0.467 41 1.24 0.191 1.18 1 1/09/90 6:00 0.452 42 1. 21 0.171 1. 05 3 11/24/90 8:00 0.449 43 1.18 0.151 0.531 30 1/27/92 15:00 0.445 44 1.15 0.131 0.318 50 12/10/92 6:00 0.440 45 1.12 0.111 0.368 48 11130/93 22:00 0.430 46 1.10 0.091 0.514 33 11130/94 4:00 0.417 47 1. 08 0.071 0.752 10 2/08/96 10:00 0.368 48 1. 05 0.051 0.668 17 1/02/97 6:00 0.343 49 1. 03 0.031 0.704 12 10/04/97 15:00 0.318 50 1. 01 0.011 8·68 SE 14-f' Srreet -June 2007 Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks Computed Peaks 1. 24 1.12 1. 01 0.857 0.827 0.743 0.577 0.472 100.00 50.00 25.00 10.00 8.00 5.00 2.00 1. 30 0.990 0.980 0.960 0.900 0.875 0.800 0.500 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-260rd.tsf Mean= -0.785 StdDev= 0.291 Project Location:Sea-Tac Skew= 1.218 ---Annual Flow Rate (CFS) 0.133 0.179 0.912 0.081 0.152 0.145 0.135 0.191 0.142 0.171 0.125 0.577 0.168 0.072 0.156 0.152 0.183 0.140 0.172 0.150 0.133 0.145 0.153 0.209 0.173 0.155 0.127 0.150 0.061 0.162 0.066 0.543 0.147 0.200 0.146 0.073 0.074 0.181 0.225 0.109 0.071 1.19 0.303 0.162 Peak Flow Rates--- Rank Time of Peak 36 14 2 42 25 31 35 II 33 18 39 4 19 45 22 26 12 34 l7 27 37 32 24 9 16 23 38 28 50 20 48 5 29 10 30 44 43 13 8 40 46 1 7 21 2/22/49 3/05/50 2/09/51 2/04/52 1/12/53 1/06/54 2/08/55 12/22/55 2/26/57 1117/58 1/24/59 11/21/59 ll/24/60 12/24/61 ll/26/62 ll/19/63 12/01/64 1/07/66 12/13/66 1/20/68 12/11/68 1/27/70 12/07/70 3/07/72 12/27 /72 1/16/74 1/13/75 12/04/75 8/26/77 12/15/77 2/13/79 12/17/79 12/30/80 10/07/81 1/06/83 12/13/83 ll/04/84 1/19/86 11124/86 12/09/87 ll/06/88 1/09/90 4/05/91 1/31/92 6:00 7: 00 16:00 9:00 7:00 12:00 15:00 16: 00 4:00 8:00 18:00 2:00 17:00 6:00 ll: 00 18: 00 8:00 3:00 15:00 20:00 7:00 4: 00 ll: 00 1:00 19: 00 19:00 23:00 4:00 7: 00 19:00 12:00 18:00 21:00 1:00 14: 00 5:00 9:00 11: 00 14:00 23:00 0:00 10:00 7:00 6:00 SE 14.r Street -June 2007 -----Flow Frequency Analysis------- --Peaks --Rank Return Prob (CFS) (ft) Period 1.19 5.21 1 89.50 0.942 5.17 2 32.13 0.932 5.17 3 19.58 0.577 5.11 4 14.08 0.543 5.10 5 10.99 0.439 5.07 6 9.01 0.303 5.03 7 7.64 0.225 5.00 8 6.63 0.209 4.99 9 5.86 0.200 4.74 10 5.24 0.191 4.51 11 4.75 0.183 4.32 12 4.34 0.181 4.29 13 3.99 0.179 4.22 14 3.70 0.178 4.21 15 3.44 0.173 4.11 16 3.22 0.172 4.08 17 3.03 0.171 4.07 18 2.85 0.168 4.00 19 2.70 0.162 3.89 20 2.56 0.162 3.81 21 2.44 0.156 3.77 22 2.32 0.155 3.74 23 2.22 0.153 3.71 24 2.13 0.152 3.69 25 2.04 0.152 3.68 26 1.96 0.150 3.65 27 1.89 0.150 3.65 28 1.82 0.147 3.59 29 1.75 0.146 3.57 30 1.70 0.145 3.56 31 1.64 0.145 3.56 32 1.59 0.142 3.52 33 1.54 0.140 3.48 34 1.49 0.135 3.40 35 1.45 0.133 3.38 36 1.41 0.133 3.38 37 1.37 0.127 3.28 38 1.33 0.125 3.27 39 1.30 0.109 3.09 40 1.27 0.105 3.04 41 1.24 0.081 2.96 42 1.21 0.074 2.91 43 1.18 0.073 2.86 44 1.15 8-69 0.989 0.969 0.949 0.929 0.909 0.889 0.869 0.849 0.829 0.809 o .789 0.769 0.749 0.729 0.709 0.690 0.670 0.650 0.630 0.610 0.590 0.570 0.550 0.530 0.510 0.490 0.470 0.450 0.430 0.410 0.390 0.370 0.350 0.330 0.310 0.291 0.271 0.251 0.231 0.211 0.191 0.171 0.151 0.131 0.070 47 1/26/93 6:00 0.072 2.80 45 1.12 0.111 0.062 49 2/17/94 23:00 0.071 2.74 46 1.10 0.091 0.178 15 12/27/94 20:00 0.070 2.60 47 1. 08 0.071 0.932 3 2/09/96 2:00 0.066 2.38 48 1. 05 0.051 0.439 6 1/02/97 12:00 0.062 2.13 49 1. 03 0.031 0.105 41 1/24/98 23:00 0.061 1. 99 50 1. 01 0.011 Computed Peaks 1. 36 5.24 100.00 0.990 Computed Peaks 0.959 5.18 50.00 0.980 Computed Peaks 0.666 5.13 25.00 0.960 Computed Peaks 0.403 5.06 10.00 0.900 Computed Peaks 0.364 5.05 8.00 0.875 Computed Peaks 0.268 5.02 5.00 0.800 Computed Peaks 0.144 3.54 2.00 0.500 Computed Peaks 0.097 3.01 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File: c-270. tsf Mean= -0.263 StdDev~ 0.125 Project Location:Sea-Tac Skew= 0.392 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 0.573 20 2/16/49 21: 00 1.10 1 89.50 0.989 1. 06 2 3/03/50 16: 00 1. 06 2 32.13 0.969 0.614 18 2/09/51 2:00 0.982 3 19.58 0.949 0.415 43 10/15/51 13:00 0.910 4 14.08 0.929 0.419 42 3/24/53 15:00 0.768 5 10.99 0.909 0.526 26 12/19/53 19: 00 0.758 6 9.01 0.889 0.530 25 11/25/54 2:00 0.728 7 7 _ 64 0.869 0.534 24 12/20/55 17: 00 0.721 8 6.63 0.849 0.646 14 12/09/56 14:00 0.707 9 5.86 0.829 0.547 21 12/25/57 16: 00 0.701 10 5.24 0.809 0.399 46 1/26/59 20:00 0.659 11 4.75 0.789 0.540 22 11/20/59 5:00 0.653 12 4.34 0.769 0.474 34 2/14/61 21 :00 0.647 13 3.99 0.749 0.447 39 11/22/61 2:00 0.646 14 3.70 0.729 0.479 31 12/15/62 2:00 0.637 15 3.44 0.709 0.520 28 12/31/63 23:00 0.633 16 3.22 0.690 0_460 38 12/21/64 4: 00 0.622 17 3.03 0.670 0.472 35 1/05/66 16:00 0.614 18 2.85 0.650 0.721 8 11/13/66 19:00 0.606 19 2.70 0.630 0.758 6 8/24/68 16:00 0.573 20 2.56 0.610 0.433 41 12/03/68 16:00 0.547 21 2.44 0.590 0.478 32 1/13/70 22:00 0.540 22 2.32 0.570 0.464 36 12/06/70 8:00 0.539 23 2.22 0.550 0.768 5 2/27/72 7:00 0.534 24 2.13 0.530 0.413 44 1/13/73 2:00 0.530 25 2.04 0.510 0.524 27 11/28/73 9:00 0.526 26 1.96 0.490 0.707 9 12/26/74 23:00 0.524 27 1. 89 0.470 0.436 40 12/02/75 20: 00 0.520 28 1. 82 0.450 0.461 37 8/26/77 2:00 0.510 29 1. 75 0.430 0.659 11 9/22/78 19: 00 0.492 30 1. 70 0.410 0.539 23 9/08/79 15:00 0.479 31 1. 64 0.390 0.633 16 12/14/79 21:00 0.478 32 1. 59 0.370 0.637 15 11/21/80 11: 00 0.476 33 1. 54 0.350 0.910 4 10/06/81 15:00 0.474 34 1. 49 0.330 0.606 19 10/28/82 16:00 0.472 35 1. 45 0.310 0.510 29 1/03/84 1: 00 0.464 36 1. 41 0.291 0.407 45 6/06/85 22:00 0.461 37 1. 37 0.271 0.647 13 1/18/86 16: 00 0.460 38 1. 33 0.251 B-70 SE 14r StreeJ-June 2007 0.728 7 10126/86 0:00 0.447 39 1. 30 0.231 0.317 49 1/14/88 0:00 0.436 40 1. 27 0.211 0.383 47 8/21/89 17: 00 0.433 41 1. 24 0.191 1.10 1 1/09/90 6:00 0.419 42 1. 21 o .17l 0.982 3 11/24/90 8:00 0.415 43 1.18 0.151 0.492 30 1/27/92 15:00 o .4l3 44 1.15 0.131 0.294 50 12/10/92 6:00 0.407 45 1.12 0.111 0.339 48 11/30/93 22:00 0.399 46 1.10 0.091 0.476 33 11/30/94 4:00 0.383 47 1. 08 0.071 0.701 10 2/08/96 10:00 0.339 48 1. 05 0.051 0.622 17 1/02/97 6:00 0.317 49 1. 03 0.031 0.653 12 10/04/97 15:00 0.294 50 1. 01 0.011 Computed peaks 1.16 100.00 0.990 Computed Peaks 1. 04 50.00 0.980 Computed Peaks 0.936 25.00 0.960 Computed Peaks 0.797 10.00 0.900 Computed Peaks 0.769 B.OO 0.B75 Computed Peaks 0.690 5.00 O.BOO Computed Peaks 0.536 2.00 0.500 Computed peaks 0.437 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File: c-300. tsf Mean= -0.057 StdDev~ 0.172 Project Location;Sea-Tac Skew= 0.335 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks Rank Return Prob (CFS) (CFS) Period 1. 02 17 2/16/49 21: 00 2.19 1 89.50 0.989 2.17 2 3/03/50 16:00 2.17 2 32.13 0.969 1. 35 8 2/09/51 14:00 1. 90 3 19.58 0.949 0.718 38 1/30/52 8:00 1. 58 4 14.0B 0.929 0.602 42 3/24/53 15:00 1. 58 5 10.99 0.909 0.842 21 12119/53 19:00 1. 50 6 9.01 0.889 1. 05 16 2/07/55 17:00 1. 36 7 7.64 0.869 1.08 15 12/7.0/55 17: 00 1. 35 8 6.63 0.849 1.11 11 12/09/56 14: 00 1. 32 9 5.86 0.829 0.796 27 12/25/57 16:00 1. 20 10 5.24 0.809 0.644 41 1/26/59 20:00 1. 20 11 4.75 0.789 1.14 13 11/20/59 21 :00 1.15 12 4.34 0.769 0.775 32 2/14/61 21 :00 1.14 13 3.99 0.749 0.543 45 11/22/61 2:00 1.11 14 3.70 0.729 0.791 29 12/15/62 2:00 1. 08 15 3.44 0.709 0.838 22 12/31/63 23:00 1. 05 16 3.22 0.690 0.672 40 12/21/64 4:00 1. 02 17 3.03 0.670 0.77l 34 1/05/66 16: 00 1. 02 18 2.85 0.650 1. 20 11 1/19/67 11 :00 0.919 19 2.70 0.630 0.919 19 8124/68 16:00 0.855 20 2.56 0.610 0.763 35 12/03/68 16: 00 0.842 21 2.44 0.590 0.775 31 1/13/70 23:00 0.838 22 2.32 0.570 0.774 33 12/06/70 8:00 0.831 23 2.22 0.550 1. 50 6 2/27/72 7:00 0.829 24 2.13 0.530 0.686 39 1/13/73 2:00 0.815 25 2.04 0.510 0.793 28 11128/73 9:00 0.807 26 1. 96 0.490 1. 32 9 12/26/74 23:00 0.796 27 1. 89 0.470 0.782 30 12/02/75 20:00 0.793 28 1. 82 0.450 0.512 47 8/26/77 2: 00 0.791 29 1. 75 0.430 0.829 24 9/22/78 19:00 0.782 30 1. 70 0.410 0.563 44 9/08/79 15:00 0.775 31 1. 64 0.390 1. 02 18 12/14/79 21:00 0.775 32 1. 59 0.370 B·?l .'IE 14.f' Street -June 1007 0.831 23 11/21/80 11: 00 0.774 33 1. 54 0.350 1.58 4 10/06/81 15:00 0.771 34 1. 49 0.330 0.807 26 1/05/83 8:00 0.763 35 1. 45 0.310 0.815 25 1/03/84 1:00 0.762 36 1. 41 0.291 0.469 48 6/06/85 22: 00 0.759 37 1. 37 0.271 1. 36 7 1/18/86 16:00 0.718 38 1.33 0.251 1. 20 10 11/24/86 3:00 0.686 39 1. 30 0.231 0.539 46 1/14/88 12:00 0.672 40 1.27 0.211 0.444 49 11/05/88 14:00 0.644 41 1.24 0.191 2.19 1 1/09/90 6:00 0.602 42 1. 21 0.171 1. 90 3 11/24/90 8:00 0.568 43 1.18 0.151 0.759 37 1/27/92 17:00 0.563 44 1.15 0.131 0.568 43 3/22/93 22: 00 0.543 45 1. 12 0.111 0.368 50 11/30/93 22:00 0.539 46 1.10 0.091 o .762 36 2/18/95 20:00 0.512 47 1.08 0.07l 1. 58 5 2/08/96 10:00 0.469 48 1. 05 0.051 1.15 12 1/02/97 6:00 0.444 49 1. 03 0.031 0.855 20 10/04/97 15:00 0.368 50 1. 01 0.011 Computed Peaks 2.42 100.00 0.990 Computed Peaks 2.12 50.00 0.980 Computed Peaks 1. 83 25.00 0.960 Computed Peaks 1. 47 10.00 0.900 Computed Peaks 1. 40 8.00 0.875 Computed Peaks 1. 21 5.00 0.800 Computed Peaks 0.859 2.00 0.500 Computed Peaks 0.647 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-304.tsf Mean= 0.141 StdDev= 0.132 Project Location:Sea-Tac Skew= 0.426 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Frob (CFS) (CFS) Period 1. 4 9 19 2/16/49 21:00 2.93 1 89.50 0.989 2.86 2 3/03/50 16:00 2.86 2 32.13 0.969 1. 65 13 2/09/51 2:00 2.61 3 19.58 0.949 1. 06 42 1/30/52 8:00 2.38 4 14.08 0.929 1. 04 44 3/24/53 15:00 2.04 5 10.99 0.909 1. 34 25 12/19/53 19: 00 1. 92 6 9.01 0.889 1. 40 22 2/07/55 l7 :00 1. 86 7 7.64 0.869 1. 42 21 12/20/55 l7: 00 1. 84 8 6.63 0.849 1. 67 12 12/09/56 14:00 1. 78 9 5.86 0.829 1. 37 24 12/25/57 16:00 1. 75 10 5.24 0.809 1. 01 45 1/26/59 20:00 1. 74 11 4.75 0.789 1. 40 23 11/20/59 5:00 1. 67 12 4.34 0.769 1.21 33 2/14/61 21: 00 1. 65 13 3.99 0.749 1. 09 41 11/22/61 2:00 1. 63 14 3.70 0.729 1. 23 31 12/15/62 2:00 1. 62 15 3.44 0.709 1. 32 26 12/31/63 23:00 1. 62 16 3.22 0.690 1.15 37 12/21/64 4: 00 1. 62 17 3.03 0.670 1. 20 34 1/05/66 16:00 1. 58 18 2.85 0.650 1. 78 9 11/13/66 19:00 1. 49 19 2.70 0.630 1. 84 8 8/24/68 16:00 1. 47 20 2.56 0.610 1.12 39 12/03/68 16:00 1. 42 21 2.44 0.590 1.22 32 1/13/70 22:00 1. 40 22 2.32 0.570 1. 20 35 12/06/70 8:00 1. 40 23 2.22 0.550 2.04 5 2/27/72 7:00 1. 37 24 2.13 0.530 1. 06 43 1113/73 2:00 1. 34 25 2.04 0.510 1. 32 27 11128/73 9:00 1. 32 26 1.96 0.490 B·72 SE J 4.f' Streei-June 2007 1. 86 7 12/26/74 23:00 1. 32 27 1. 89 0.470 1.14 38 12/02/75 20:00 1. 30 28 1. 82 0.450 1.10 40 8/26/77 2:00 1.27 29 1."/5 0.430 1. 62 15 9/22/78 19:00 1. 24 30 1. 70 0.410 1. 27 29 9/08/79 15:00 1. 23 31 1. 64 0.390 1. 62 17 12/14/79 21: 00 1. 22 32 1. 59 0.370 1. 58 18 11/21/80 11: 00 1.21 33 1. 54 0.350 2.38 4 10106/81 15:00 1. 20 34 1. 49 0.330 1. 47 20 10/28/82 16:00 1. 20 35 1. 45 0.310 1. 30 28 1/03184 1: 00 1.17 36 1. 41 0.291 0.978 46 6/06/85 22:00 1.15 37 1. 37 0.271 1. 75 10 1/18/86 16:00 1.14 38 1. 33 0.251 1.74 11 10126/86 0:00 1.12 39 1. 30 0.231 0.782 49 1/14/88 12:00 1. 10 40 1.27 0.211 0.897 47 8/21/89 17: 00 1. 09 41 1. 24 0.191 2.93 1 1/09/90 6:00 1. 06 42 1. 21 0.171 2.61 3 11/21190 8:00 1. 06 43 1. 18 0.151 1. 24 30 1/27/92 15:00 1. 04 44 1.15 0.131 0.756 50 3/22/93 22:00 1. 01 45 1. 12 0.111 0.806 48 11/30/93 22:00 0.978 46 1.10 0.091 1.17 36 11/30/94 4:00 0.897 47 1. 08 0.07l 1. 92 6 2/08/96 10:00 0.806 48 1. 05 0.051 1. 63 14 1/02/97 6:00 0.782 49 1. 03 0.031 1. 62 16 10104/97 15:00 0.756 50 1. 01 0.011 Computed Peaks 3.09 100.00 0.990 Computed Peaks 2.77 50.00 0.980 Computed Peaks 2.46 25.00 0.960 Computed Peaks 2.07 10.00 0.900 Computed Peaks 1. 99 8.00 0.875 Computed Peaks 1. 77 5.00 0.800 Computed Peaks 1. 36 2.00 0.500 Computed Peaks 1. 09 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-306.tsf Mean"" -1.180 StdDev= 0.204 Project Location:Sea-Tac Skew= 0.041 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.081 17 2/16/49 21:00 0.177 1 89.50 0.989 0.176 2 3/03/50 16: 00 0.176 2 32.13 0.969 0.126 5 2/09/51 15:00 0.153 3 19.58 0.949 0.056 37 1/30/52 8:00 0.136 4 14.08 0.929 0.042 44 3/24/53 15:00 0.126 5 10.99 0.909 0.062 23 12/19/53 19:00 0.122 6 9.01 0.889 0.087 15 2/07155 19:00 0.118 7 7.64 0.869 0.089 14 12120/55 17:00 0.115 8 6.63 0.849 0.085 16 12/09/56 14:00 0.104 9 5.86 0.829 0.064 21 1/16/58 16:00 0.100 10 5.24 0.809 0.052 40 1/23/59 23:00 0.100 11 4.75 0.789 0.100 10 11/20/59 21 :00 0.100 12 4.34 0.769 0.058 31 2114/61 21 :00 0.092 13 3.99 0.749 0.037 45 1/02/62 22:00 0.089 14 3.70 0.729 0.059 30 12/15/62 2:00 0.087 15 3.44 0.709 0.062 22 12/31/63 23:00 0.085 16 3.22 0.690 0.047 42 12/21/64 4:00 0.081 17 3.03 0.670 0.058 32 1/05/66 16:00 0.073 18 2.85 0.650 0.100 11 1/19/67 14:00 0.069 19 2.70 0.630 0.060 25 2/03/68 22:00 0.067 20 2.56 0.610 B·73 SE 14,f' Streel-June 2007 0.060 27 12/03/68 16:00 0.064 21 2.44 0.590 0.060 28 1/13/70 23:00 0.062 22 2.32 0.570 0.058 33 12/06/70 8:00 0.062 23 2.22 0.550 0.122 6 2/28/72 3:00 0.061 24 2.13 0.530 0.053 38 1/13/73 4: 00 0.060 25 2.04 0.510 0.057 34 1/15/74 2: 00 0.060 26 1. 96 0.490 0.104 9 12/26/74 23:00 0.060 27 1. 89 0.470 0.061 24 12/02/75 20:00 0.060 28 1. 82 0.450 0.029 48 8/26/77 2:00 0.059 29 1. 75 0.430 0.057 35 12/10/77 n:oo 0.059 30 1. 70 0.410 0.031 47 11/19/78 3:00 0.058 31 1. 64 0.390 0.073 18 12/14/79 21: 00 0.058 32 1. 59 0.370 0.056 36 12/26/80 0:00 0.058 33 1. 54 0.350 0.118 7 10/06/81 15:00 0.057 34 1. 49 0.330 0.069 19 1/05/83 8:00 0.057 35 1. 45 0.310 0.060 26 1/03/84 1:00 0.056 36 1. 41 0.291 0.031 46 2/11/85 3:00 0.056 37 1. 37 0.271 0.115 8 1/18/86 16:00 0.053 38 1. 33 0.251 0.100 12 11/24/86 4:00 0.052 39 1. 30 0.231 0.043 43 1/14/88 12:00 0.052 40 1.27 0.211 0.027 49 12/30/88 5:00 0.048 41 1.24 0.191 0.177 1 1/09/90 6:00 0.047 42 1.21 0.171 0.153 3 11/24/90 8: 00 0.043 43 1.18 0.151 0.059 29 1/27/92 17:00 0.042 44 1.15 0.131 0.048 41 3/22/93 23:00 0.037 45 1.12 0.111 0.023 50 2/17/94 18:00 0.031 46 1.10 0.091 0.067 20 2/19/95 18:00 0.031 47 1. 08 0.071 0.136 4 2/08/96 10:00 0.029 48 1. 05 0.051 0.092 13 1/02/97 6:00 0.027 49 1. 03 0.031 0.052 39 10/04/97 15:00 0.023 50 1. 01 0.011 Computed Peaks 0.200 100.00 0.990 Computed Peaks 0.176 50.00 0.980 Computed Peaks 0.152 25.00 0.960 Computed Peaks 0.121 10.00 0.900 Computed Peaks 0.115 8.00 0.875 Computed Peaks 0.098 5.00 0.800 Computed Peaks 0.066 2.00 0.500 Computed Peaks 0.046 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-310.tsf Mean= -0.648 StdDev~ 0.233 Project Location:Sea-Tac Skew~ -0.139 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.276 16 2/16/49 22:00 0.627 1 89.50 0.989 0.539 5 3/03/50 16:00 0.592 2 32.13 0.969 0.592 2 2/09/51 18:00 0.561 3 19.58 0.949 0.186 32 1130/52 9:00 0.549 4 14.08 0.929 0.143 42 1/18/53 19:00 0.539 5 10.99 0.909 0.208 28 1/06/54 5:00 0.456 6 9.01 0.889 0.368 9 2/07/55 21:00 0.440 7 7.64 0.869 0.313 13 12/20/55 17:00 0.396 8 6.63 0.849 0.244 21 12/09/56 15:00 0.368 9 5.86 0.829 0.259 20 1/16/58 20:00 0.368 10 5.24 0.809 0.212 24 1/24/59 2:00 0.364 11 4.75 0.789 0.396 8 11/20/59 21:00 0.317 12 4.34 0.769 0.215 23 2/24/61 15:00 0.313 13 3.99 0.749 0.129 44 1/03/62 2:00 0.306 14 3.70 0.729 8-74 SF. 14¢1' Street-June 2007 0.171 36 11/25/62 15:00 0.285 15 3.44 0.709 0.212 25 1/01/64 18:00 0.276 16 3.22 0.690 0.150 40 11130/64 12:00 0.273 17 3.03 0.670 0.163 38 1/06/66 3:00 0.273 18 2.85 0.650 0.364 11 1/19/67 14: 00 0.265 19 2.70 0.630 0.216 22 2/03/68 23:00 0.259 20 2.56 0.610 0.211 27 12/03/68 17:00 0.244 21 2.44 0.590 0.179 34 1/13/70 23:00 0.216 22 2.32 0.570 0.145 41 12/06/70 8:00 0.215 23 2.22 0.550 0.440 7 2/28/72 3:00 0.212 24 2.13 0.530 0.195 30 1/13/73 5:00 0.212 25 2.04 0.510 0.212 26 1/15/74 2:00 0.212 26 l.96 0.490 0.317 12 12/26/74 23:00 0.211 27 l. 89 0.470 0.196 29 12/03/75 17: 00 0.208 28 l. 82 0.450 0.022 50 3/24/77 20:00 0.196 29 1.75 0.430 0.169 37 ))/10/77 17: 00 0.195 30 l. 70 0.410 0.102 46 2/12/79 8:00 0.190 31 l. 64 0.390 0.273 18 12/15/79 8:00 0.186 32 l. 59 0.370 0.151 39 12/26/80 4:00 0.183 33 l. 54 0.350 0.273 17 10/06/81 15:00 0.179 34 l. 49 0.330 0.265 19 1/05/83 8:00 0.177 35 l.45 0.310 0.177 35 1/24/84 11: 00 0.171 36 l. 41 0.291 0.085 48 2/11/85 6:00 0.169 37 l. 37 0.271 0.456 6 1/18/86 21: 00 0.163 38 l. 33 0.251 0.368 10 11/24/86 4:00 0.151 39 l. 30 0.231 0.139 43 1/14/88 12:00 0.150 40 l. 27 0.211 0.088 4) 4/05/89 16:00 0.145 41 l. 24 0.191 0.627 1 1/09/90 9:00 0.143 42 l.21 0.171 0.549 4 4/05/91 2:00 0.139 43 l.18 0.151 0.183 33 1/27/92 17: 00 0.129 44 l.15 0.131 0.190 31 3/23/93 0:00 0.107 45 l.12 0.111 0.053 49 3/03/94 4:00 0.102 46 1.10 0.091 0.285 15 2/19/95 20:00 0.088 47 1. 08 0.071 0.561 3 2/09/96 1: 00 0.085 48 l. 05 0.051 0.306 14 1/02/97 9:00 0.053 49 l. 03 0.031 0.107 45 1/07/98 10:00 0.022 50 l. 01 0.011 Computed Peaks 0.743 100.00 0.990 Computed Peaks 0.651 50.00 0.980 Computed Peaks 0.561 25.00 0.960 Computed Peaks 0.444 10.00 0.900 Computed Peaks 0.420 8.00 0.875 Computed Peaks 0.355 5.00 0.800 Computed Peaks 0.228 2.00 0.500 Computed Peaks 0.151 l. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:c-320.tsf Mean= -0.597 StdDev= 0.226 Project Location:Sea-Tac Skew~ -0.141 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.312 16 2/16/49 22:00 0.692 1 89.50 0.989 0.636 2 3/03/50 16:00 0.636 2 32.13 0.969 0.621 3 2/09/51 18:00 0.621 3 19.58 0.949 0.207 33 1/30/52 8:00 0.595 4 14.08 0.929 0.161 42 1/18/53 19: 00 0.586 5 10.99 0.909 0.223 29 1/22/54 20:00 0.495 6 9.01 0.889 0.392 11 2/07/55 21 :00 0.485 7 7.64 0.869 0.351 14 12/20/55 17 :00 0.434 8 6.63 0.849 B-75 SE 14,f' Streef --June 2007 0.284 20 12/09/56 14:00 0.411 9 5.86 0.829 0.275 21 1/16/58 20:00 0.408 10 5.24 0.809 0.227 28 1/24/59 2:00 0.392 11 4.75 0.789 0.434 8 11120/59 21: 00 0.375 12 4.34 0.769 0.227 26 2/24/61 15:00 0.356 13 3.99 0.749 0.142 44 1/02/62 22:00 0.354 14 3.70 0.729 0.192 36 11/25/62 14:00 0.339 15 3.44 0.709 0.234 25 1/01/64 14:00 0.312 16 3.22 0.690 0.167 11 11/30/64 22:00 0.301 l7 3.03 0.670 0.191 37 1/05/66 16:00 0.295 18 2.85 0.650 0.408 10 1/19/67 14: 00 0.293 19 2.70 0.630 0.239 22 2/03/68 22:00 0.284 20 2.56 0.610 0.237 23 12/03/68 l7: 00 0.275 21 2.44 0.590 0.212 32 1/13/70 23:00 0.239 22 2.32 0.570 0.183 39 12/06/70 8:00 0.237 23 2.22 0.550 0.495 6 2/28/72 3:00 0.235 24 2.13 0.530 0.215 30 1/13/73 5:00 0.234 25 2.04 0.510 0.235 24 1/15/74 2:00 0.227 26 1.96 0.490 0.375 12 12/26/74 23:00 0.227 27 1. 89 0.470 0.227 27 12/02/75 20:00 0.227 28 1. 82 0.450 0.047 50 3/24/77 19: 00 0.223 29 1.75 0.430 0.201 35 12/10/77 l7 :00 0.215 30 1. 70 0.410 0.114 46 2/12/79 7:00 0.215 31 1. 64 0.390 0.295 18 12/15/79 8:00 0.212 32 1. 59 0.370 0.180 40 12/26/80 0:00 0.207 33 1. 54 0.350 0.356 13 10/06/81 15:00 0.207 34 1. 4 9 0.330 0.293 19 1/05/83 8:00 0.201 35 1. 45 0.310 0.190 38 1/24/84 11: 00 0.192 36 1. 41 0.291 0.095 48 2/11/85 5: 00 0.191 37 1. 37 0.271 0.485 7 1/18/86 20:00 0.190 38 1. 33 0.251 0.411 9 11/24/86 4:00 0.183 39 1. 30 0.231 0.161 43 1/14/88 12:00 0.180 40 1. 27 0.211 0.098 47 4/05/89 16: 00 0.167 41 1. 24 0.191 0.692 1 1/09/90 9:00 0.161 42 1.21 0.171 0.586 5 4/05/91 2:00 0.161 43 1.18 0.151 0.215 31 1/27/92 l7 :00 0.142 44 1.15 0.131 0.207 34 3/22/93 23:00 0.132 45 1.12 0.111 0.063 49 2/17/94 18:00 0.114 46 1.10 0.091 0.301 17 2/19/95 18:00 0.098 47 1. 08 0.071 0.595 4 2/09/96 1:00 0.095 48 1. 05 0.051 0.339 15 1/02/97 9:00 0.063 49 1. 03 0.031 0.132 45 10/30/97 7:00 0.047 50 1. 01 0.011 Computed Peaks 0.806 100.00 0.990 Computed Peaks 0.709 50.00 0.980 Computed Peaks 0.614 25.00 0.960 Computed Peaks 0.489 10.00 0.900 Computed Peaks 0.463 8.00 0.875 Computed Peaks 0.394 5.00 0.800 Computed Peaks 0.256 2.00 0.500 Computed Peaks 0.171 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series Fi1e:c-330.tsf Mean= -0.930 StdDev= 0.187 Project Location:Sea-Tac Skew= 0.198 ---Annual Peak Flow Rates--------Flow Frequency Ana!ysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 0.139 l7 2/16/49 21 :00 0.307 1 89.50 0.989 0.307 2 3/03/50 16:00 0.307 2 32.13 0.969 8·76 SE 14¢A Slreet June 2007 0.193 7 2/09/51 14:00 0.265 3 19.58 0.949 0.097 38 1130/52 8:00 0.222 4 14.08 0.929 0.078 43 3/24/53 15:00 0.218 5 10.99 0.909 0.112 20 12/19/53 19:00 0.208 6 9.01 0.889 0.144 16 2/07/55 17:00 0.193 7 7.64 0.869 0.149 15 12/20/55 17:00 0.190 8 6.63 0.819 0.152 14 12/09/56 14: 00 0.182 9 5.86 0.829 0.107 26 1/16/58 16:00 0.167 10 5.21 0.809 0.087 41 1/23/59 23:00 0.166 11 4.75 0.789 0.162 12 11/20/59 21: 00 0.162 12 4.34 0.769 0.103 34 2/14/61 21:00 0.158 13 3.99 0.749 0.068 45 11/22/61 2:00 0.152 14 3.70 0.729 0.107 27 12/15/62 2:00 0.149 15 3.44 0.709 0.111 23 12131/63 23:00 0.144 16 3.22 0.690 0.087 40 12/21/64 4:00 0.139 17 3.03 0.670 0.103 35 1/05/66 16; 00 0.137 18 2.85 0.650 0.166 11 1/19/67 14:00 0.116 19 2.70 0.630 0.116 19 8/24/68 16:00 0.112 20 2.56 0.610 0.103 36 12/03/68 16:00 0.112 21 2.44 0.590 0.104 33 1/13/70 23:00 0.112 22 2.32 0.570 0.105 32 12/06/70 8:00 0.111 23 2.22 0.550 0.208 6 2/27/72 7:00 0.109 24 2.13 0.530 0.092 39 1/13/73 2:00 0.108 25 2.04 0.510 0.106 29 11/28/73 9:00 0.107 26 l.96 0.490 0.182 9 12/76/74 23:00 0.107 27 l. 89 0.470 0.106 30 12/02/75 20:00 0.106 28 l. 82 0.450 0.061 47 8/26/77 2:00 0.106 29 1. 75 0.430 0.106 28 9/22/78 19: 00 0.106 30 1. 70 0.410 0.065 46 9/08/79 15:00 0.106 31 1. 64 0.390 0.137 18 12/14/79 21:00 0.105 32 1. 59 0.370 0.108 25 11/21/80 11: 00 0.104 33 1. 54 0.350 0.218 5 10/06/81 15:00 0.103 34 l. 4 9 0.330 0.112 21 1/05/83 8: 00 0.103 35 l. 45 0.310 0.109 24 1/03/84 1:00 0.103 36 1. 41 0.291 0.058 48 2/11/85 3:00 0.102 37 l. 37 0.271 0.190 8 1/18/86 16:00 0.097 38 1. 33 0.251 0.167 10 11/24/86 3:00 0.092 39 1. 30 0.231 0.073 44 1/14/88 12:00 0.087 40 1. 27 0.211 0.056 49 11/05/88 14:00 0.087 41 l. 24 0.191 0.307 1 1/09/90 6:00 0.078 42 l. 21 0.171 0.265 3 11/24/90 8:00 0.078 43 1.18 0.151 0.102 37 1/27/92 17:00 0.073 44 l.15 0.131 0.078 42 3/22/93 22:00 0.068 45 1.12 0.111 0.043 50 11/30/93 22:00 0.065 46 1.10 0.091 0.106 31 2/19/95 17:00 0.061 47 1. 08 0.071 0.222 4 2/08/96 10:00 0.058 48 1. 05 0.051 0.158 13 1/02/97 6:00 0.056 49 1. 03 0.031 0.112 22 10/04/97 15:00 0.043 50 1. 01 0.011 Computed Peaks 0.341 100.00 0.990 Computed Peaks 0.298 50.00 0.980 Computed Peaks 0.257 25.00 0.960 Computed Peaks 0.206 10.00 0.900 Computed Peaks 0.196 8.00 0.875 Computed Peaks 0.168 5.00 0.800 Computed Peaks 0.116 2.00 0.500 Computed Peaks 0.084 1. 30 0.231 Flow Frequency Analysis LogPearson III Coefficients Time Series File:cb4a.tsf Mean= 0.641 StdDev~ 0.148 Project Location:Sea-Tac Skew= 0.477 B·77 SE J4.f' Street -June 2007 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 4.78 21 2/16/49 21:00 10.01 1 89.50 0.989 9.85 2 3/03/50 16:00 9.85 2 32.13 0.969 5.62 9 2/09/51 2:00 8.83 3 19.58 0.949 3.39 39 1/30/52 8:00 8.04 4 14.08 0.929 3.11 44 3/24/53 15:00 6.85 5 10.99 0.909 4.19 24 12/19/53 19:00 6.76 6 9.01 0.889 4.71 22 2/07/55 17 :00 6.21 7 7.64 0.869 4.82 20 12/20/55 17 :00 6.01 8 6.63 0.849 5.41 12 12/09/56 14:00 5.62 9 5.86 0.829 4.19 25 12/25/57 16: 00 5.52 10 5.24 0.809 3.16 43 1/26/59 20:00 5.49 11 4.75 0.789 4.92 18 11/20/59 21:00 5.41 12 4.34 0.769 3.78 34 2/14/61 21:00 5.37 13 3.99 0.749 3.20 42 11/22/61 2:00 5.35 14 3.70 0.729 3.90 29 12/15/62 2:00 5.16 15 3.44 0.709 4.13 26 12/31/63 23:00 4.98 16 3.22 0.690 3.49 :n 12/21/64 4: 00 4.92 17 3.03 0.670 3.79 33 1/05/66 16:00 4.92 18 2.85 0.650 5.49 11 11/13/66 19:00 4.84 19 2.70 0.630 5.35 14 8/24/68 16:00 4.82 20 2.56 0.610 3.62 36 12/03/68 16: 00 4.78 21 2.44 0.590 3.85 32 1/13/70 22: 00 4.71 22 2.32 0.570 3.87 30 12/06/70 8:00 4.23 23 2.22 0.550 6.85 5 2/27/72 7:00 4.19 24 2.13 0.530 3.34 41 1/13/73 2:00 4.19 25 2.04 0.510 4.11 27 11/28/73 9:00 4.13 26 1.96 0.490 6.21 7 12/26/74 23:00 4.11 27 1. 89 0.470 3.70 35 12/02/75 20:00 4.07 28 1. 82 0.450 3.05 45 8/26/77 2:00 3.90 29 1. 75 0.430 4.92 17 9/22/78 19:00 3.87 30 1. 70 0.410 3.38 40 9/08/79 15:00 3.86 31 1. 64 0.390 5.16 15 12/14/79 21: 00 3.85 32 1. 59 0.370 4.84 19 11/21/80 11:00 3.79 33 1. 54 0.350 8.04 4 10/06/81 15:00 3.78 34 1. 49 0.330 4.23 23 10/28/82 16: 00 3.70 35 1. 45 0.310 4.07 28 1/03/84 1:00 3.62 36 1. 41 0.291 2.75 46 6/06/85 22:00 3.49 37 1. 37 0.271 6.01 8 1/18/86 16:00 3.48 38 1. 33 0.251 5.52 10 11/24/86 3: 00 3.39 39 1. 30 0.231 2.57 48 1114/88 12:00 3.38 40 1. 27 0.211 2.63 47 11/05/88 14:00 3.34 41 1.24 0.191 10.01 1 1/09/90 6:00 3.20 42 1. 21 0.171 8.83 3 11/24/90 8: 00 3.16 43 1.18 0.151 3.86 31 1/27/92 15:00 3.11 44 1.15 0.131 2.55 49 3/22/93 22:00 3.05 45 1. 12 0.111 2.19 50 11/30/93 22:00 2.75 46 1.10 0.091 3.48 38 11/30/94 4:00 2.63 47 1. 08 0.071 6.76 6 2/08/96 10:00 2.57 48 1. 05 0.051 5.37 13 1/02/97 6:00 2.55 49 1. 03 0.031 4.98 16 10/04/97 15:00 2.19 50 1. 01 0.011 Computed Peaks 10.86 100.00 0.990 Computed Peaks 9.57 50.00 0.980 Computed Peaks 8.36 25.00 0.960 Computed Peaks 6.86 10.00 0.900 Computed Peaks 6.57 8.00 0.875 Computed Peaks 5.76 5.00 0.800 8·78 SE 14.f' Street-June 2007 Computed Peaks 4.25 2.00 0.500 Computed Peaks 3.35 1. 30 0.231 Flow Frequency Analysis LogFearson III Coefficients Time Series File:cb18a.tsf Mean= 1. 006 StdDev~ 0.144 Project Location:Sea-Tac Skew= 0.500 ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks Rank Return Prob (CFS) (CFS) Period 11.14 18 2116/49 21:00 22.43 1 89.50 0.989 21. 83 2 3/03/50 16:00 21. 83 2 32.13 0.969 14."12 7 2/09/51 15:00 19.81 3 19.58 0.949 8.02 38 1/30/52 8: 00 18.28 4 14.08 0.929 7.15 45 3/24/53 15:00 16.05 5 10.99 0.909 9.63 23 12119/53 19:00 15.54 6 9.01 0.889 11.00 19 2/07/55 17: 00 14.72 7 7.64 0.869 11. 33 17 12120/55 17:00 14.05 8 6.63 0.849 12.33 14 12/09/56 14:00 13.90 9 5.86 0.829 9.52 25 12/25/57 16:00 13.36 10 5.24 0.809 7.42 42 1126/59 20:00 12.80 11 4.75 0.789 12.72 12 1l120/59 21:00 12.72 12 4.34 0.769 8.76 34 2/14/61 21: 00 12.37 13 3.99 0.749 7.24 43 1l/22/61 2: 00 12.33 14 3.70 0.729 8.93 30 12115/62 2: 00 11.96 15 3.44 0.709 9.51 26 12/31/63 23:00 11.67 16 3.22 0.690 8.01 39 12/21/64 4: 00 11.33 17 3.03 0.670 8.86 32 1/05/66 16:00 11.14 18 2.85 0.650 12.37 13 1119/67 14:00 11.00 19 2.70 0.630 11.96 15 8/24/68 16:00 10.83 20 2.56 0.610 8.55 36 12103/68 16:00 10.75 21 2.44 0.590 8.89 31 1113/70 22:00 10.65 22 2.32 0.570 9.00 29 12/06/70 8:00 9.63 23 2.22 0.550 15.54 6 2/27/72 7:00 9.57 24 2.13 0.530 7.85 41 1/13/73 2:00 9.52 25 2.04 0.510 9.13 28 11/28/73 9:00 9.51 26 1. 96 0.490 14.05 8 12/26/74 23:00 9.24 27 1. 89 0.470 8.70 35 12/02/75 20:00 9.13 28 1. 82 0.450 7.23 44 8/26/Tl 2:00 9.00 29 1. 75 0.430 10.83 20 9/22/78 19:00 8.93 30 1. 70 0.410 7.86 40 9/08/79 15:00 8.89 31 1. 64 0.390 11.67 16 12114/79 21:00 8.86 32 1. 59 0.370 10.65 22 11/21/80 11: 00 8.84 33 1. 54 0.350 18.28 4 10/06/81 15:00 8.76 34 1. 49 0.330 9.57 24 10/28/82 16: 00 8.70 35 1.45 0.310 9.24 27 1/03/84 1:00 8.55 36 1. 41 0.291 6.55 46 6/06/85 22:00 8.31 37 1. 37 0.271 13.90 9 1/18/86 16:00 8.02 38 1. 33 0.251 13.36 10 11/24/86 4:00 8.01 39 1. 30 0.231 6.18 48 1/14/88 12:00 7.86 40 1.27 0.211 6.12 49 11/05/88 14:00 7.85 41 1. 24 0.191 22.43 1 1/09/90 6:00 7.42 42 1.21 0.171 19.81 3 11/24/90 8: 00 7.24 43 1. 18 0.151 8.84 33 1/27/92 15:00 7.23 44 1.15 0.131 6.20 47 3/22/93 22: 00 7.15 45 1.12 0.111 5.26 50 11/30/93 22:00 6.55 46 1. 10 0.091 8.31 37 12/27/94 1:00 6.20 47 1. 08 0.071 16.05 5 2/08/96 10:00 6.18 48 1. 05 0.051 12.80 11 1/02/97 6:00 6.12 49 1. 03 0.031 10.75 21 10/04/97 15:00 5.26 50 1. 01 0.011 B-79 SE 144'" Street -June 2007 Computed Peaks 24.66 100.00 0.990 Computed Peaks 21.78 50.00 0.980 Computed Peaks 19.08 25.00 0.960 Computed Peaks 15.70 10.00 0.900 computed Peaks 15.05 8.00 0.875 Computed Peaks 13.24 5.00 0.800 Computed Peaks 9.86 2.00 0.500 Computed Peaks 7.83 1. 30 0.231 8·80 SE 14.fh Streel-June 2007 Table C.1. XP-Storm Conveyance Reach Descriptions Upstream Upstream Invert Downstream Link Node Downstream Elevation Invert Diameter Name Name Node Name Length ft Roughness ft Elevation ft Shape (Hei9ht) ft POl GBl DS 200.00 0.02 355.41 335.00 Circular 2.00 P02 GB2 GBl 200.00 0.02 359.42 357.41 Circular 2.00 P04 GB3 GB2 220.00 0.02 361.55 359.52 Circular 2.00 POO GB4 GB3 210.00 0.02 363.83 361.60 Circular 2.00 Pl0 GB5 CB4 42.00 0.02 363.88 363.98 Circular 2.00 P12 CB6 CB5 44.00 0.02 364.11 364.13 Circular 2.00 P14 CB7 CB6 150.30 0.02 364.93 364.31 Circular 150 P16 CB8 CB7 169.30 0.02 365.45 364.99 Circular 1.50 P19 GB9A CB9 50.00 0.01 366.73 366.33 Circular 100 P18 GB9 CB8 168.30 0.02 365.93 365.50 Circular 1.50 P20 CB10 CB9 182.40 0.02 366.45 365.98 Circular 1.50 P21 CB10A CB10 39.00 0.02 367.11 366.92 Circular 1.00 P22 CBll CB10 141.60 0.02 366.95 366.48 Circular 1.50 P70 CBllA GBll 34.00 0.02 367.63 367.49 Circular 100 MUllA GB11A CB10A 120.00 0.01 370.48 370.24 Trapezoid" 0.30 MU11B CB11B CBllA 160.00 0.01 370.50 370.38 Trapezoid" 0.40 MUllB CB11B CB11A 160.00 0.01 370.60 370.48 Trapezoidc 0.30 P24 CB12 CBll 169.30 0.02 367.52 367.00 Circular 1.50 P26 CB13 CB12 142.40 0.02 367.85 367.52 Circular 1.50 P50 CB14A CB14 52.00 0.D1 369.46 369.25 Circular 1.00 ST14A CB14A CBllB 260.00 0.01 371.39 370.70 Trapezoid" 0.20 P28 CB14 CB13 115.00 0.02 368.15 367.92 Circular 1.50 P30 GB15 CB14 34.00 0.02 368.42 368.20 Circular 150 P60 CB15A CB15 52.00 0.01 369.19 368.87 Circular 1.00 OV15A CB15A CB14A 38.00 0.01 371.41 371.39 Trapezoid" 0.20 P54 GB14G CB14B 105.00 0.01 370.25 369.89 Circular 1.00 P64 GB15G CB15B 105.00 0.01 373.17 371.37 Circular 100 P66 CB15D CB15C 60.00 0.D1 379.23 373.30 Circular 1.00 P32 CB16 CB15 197.40 0.02 369.15 368.52 Circular 150 P34 GB17 CB16 300.50 0.02 371.76 370.27 Circular 150 P36 CB18 GB17 118.30 0.02 372.98 372.41 Circular 1.50 P37 CB18A GB18 37.00 0.02 373.91 374.13 Circular 1.50 Dl GB18A N15A-2 10.00 0.03 375.50 375.40 Trapezoidc 0.50 P38 CB19 CB18 198.50 0.02 374.69 373.83 Circular 1.00 P40 CB20 GB19 247.50 0.02 375.98 374.74 Circular 1.00 P42 CB21 GB20 192.20 0.02 376.95 375.98 Circular 1.00 P08 CB4A CB4 190.00 0.02 366.18 364.73 Circular 1.50 P52 CB14B CB14A 28.00 0.01 369.89 369.49 Circular 1.00 P62 CB15B CB15A 142.00 0.01 371.32 369.39 Circular 1.00 P61 CB15A-l GB15A 20.00 0.01 370.20 369.27 Circular 1.00 P61 CB15A-l CB15A 20.00 0.01 372.03 371.31 Trapezoid;: 0.30 POBA CB4B CB4A 190.00 0.02 367.26 366.1B Circular 150 POBB CB4C CB4B 25.00 0.02 367.63 367.26 Circular 1.50 D2 N15A-2 CB15A-l 590.00 0.03 376.00 370.20 Natural 2.00 Table C.2. XP-Storm Inflows -25-Year Peak Rates Node Name Constant Inflow ft"3/$ CB1 CB2 CB3 0.045 CB4 0.206 CB5 CB6 0.242 CB7 CBB 0.198 CB9A 0.297 CB9 CB10 CB10A CB11 0.126 CB11A CB11B CB12 CB13 CB14A CB14 0.200 CB15 0.588 CB15A 0.724 CB14C 0.388 CB15C CB15D CB16 CB17 CB18 CB18A CB19 CB20 CB21 CB4A CB14B CB15B DS CB15A-1 CB4B 0.204 19.080 0.157 CB4C 8.360 N15A-2 Table C.3. XP-Storm 2S-Year Water Surface Elevations Ground Max Elevation Water Node (Spill Elevation Freeboard Name Name Crest) ft (ft) (ft) CBl CBl 362.33 356.168 6.16 CB2 CB2 363.47 361.096 2.37 CB3 CB3 365.3 363.217 2.08 CB4 CB4 368.98 365.394 3.59 CBS CBS 369.38 365.546 3.83 CB6 CB6 36831 365.711 2.6 CB7 CB7 368.87 366.833 2.04 CB8 CB8 369.4 368.097 1.3 CB9A CB9A 369.78 369.244 0.54 CB9 CB9 370.08 369.242 0.84 CB10 CB10 370.57 370.303 0.27 CB10A CB10A 370.54 370.54 0 CBll CBll 370.85 370.689 0.16 CBllA CBllA 370.78 370.69 0.09 CBllB CBllB 370.9 370.751 0.15 CB12 CB12 371.3 371.084 0.22 CB13 CB13 371.97 371.42 0.55 CB14A CB14A 371.59 371.59 0 CB14 CB14 372.3 371.691 0.61 CB15 CB15 372.37 371.914 0.46 CB15A CB15A 371.61 371.61 0 CB14C CB14C 373.43 371.615 1.81 CB15C CB15C 376.36 373.17 3.19 CB15D CB15D 382.03 379.23 2.8 CB16 CB16 374.35 373.612 0.74 CB17 CB17 378.16 376.102 2.06 CB18 CB18 378.63 377.195 1.44 CB18A CB18A 378.66 377.601 1.06 CB19 CB19 379.29 377.209 2.08 CB20 CB20 379.8 377.226 2.57 CB21 CB21 380.47 377.315 3.16 CB4A C84A 373.58 368.27 5.31 CB14B CB14B 372.27 371.598 0.67 CB15B CB15B 374.02 371.611 2.41 DS DS 340 337 3 CBI5A-l CBI5A-l 372.33 372.33 0 CB4B C84B 371.36 370.179 1.18 CB4C C84C 370.43 370.43 0 N15A-2 N15A-2 378 377.519 0.48 Table C.4. XP·Stonn 25·Year Flow Rates Max Max Velocity Invert Water Max Flow (fils. m/s) Node Elevation Elevation link Name cis fils Name ft ft POl 10.86 10.01 CBl 355.41 356.17 P02 10.86 3.99 CB2 359.42 361.10 P04 10.87 3.91 CB3 361.55 363.22 P06 10.90 4.12 CB4 363.83 365.39 Pl0 4.89 1.78 CBS 363.BB 365.55 P12 4.90 1.84 CB6 384.11 365.71 P14 4.63 2.62 CB7 364.93 366.83 P16 4.63 2.60 CB8 365.45 368.10 P19 0.30 0.38 CB9A 366.73 369.24 P18 4.42 2.49 CB9 365.93 369.24 P20 4.13 2.31 CB10 366.45 370.30 P21 1.33 1.67 CB10A 367.11 370.54 P22 2.80 1.57 CBll 366.95 370.69 PYO 0.12 0.15 CBllA 367.56 370.69 MU11A 2.66 1.33 CBllA 367.56 370.69 MU11B 1.96 0.82 CBllB 369.40 370.75 MUllB O.BO 0.58 CBllB 369.40 370.75 P24 2.57 1.44 CB12 367.52 371.08 P26 2.57 1.44 CB13 367.85 371.42 P50 (1.19) (1.50) CB14A 369.46 371.59 ST14A 2.76 1.57 CB14A 369.46 371.59 P28 2.57 1.44 CB14 368.15 371.69 P30 3.56 2.00 CB15 368.42 371.91 P60 (2.07) (2.60) CB15A 369.19 371.61 OV15A 1.40 0.78 CB15A 369.19 371.61 P54 0.39 0.49 CB14C 370.25 371.62 P32 5.04 2.82 CB16 369.15 373.61 P34 5.04 2.82 CB17 371.76 376.10 P36 5.04 2.82 CB18 372.93 377.20 P37 5.13 2.88 CB18A 373.91 377.60 Dl 14.66 3.09 CB18A 373.91 377.60 P3B (0.37) 0.20 CB19 374.69 377.21 P40 (0.32) 0.26 CB20 374.72 377.23 P42 0.16 0.87 CB21 375.98 377.32 P08 5.73 3.35 CB4A 366.18 368.27 P52 0.39 0.49 CB14B 369.89 371.60 P61 3.7B 4.78 CB15A·l 370.20 372.33 P61 2.55 5.62 CB15A·l 370.20 372.33 P08A 5.73 3.22 CB4B 367.26 370.18 P08B 5.73 3.23 CB4C 367.63 370.43 D2 14.66 8.62 N15A·2 375.00 377.52 ,I i , , , , ;H i,l 1 1 1 I ,I 1 I \ 1 1 1 1 1 1 1""1 J I J , I I , , I , I , I , I , ,., I h " , ,! I 1\ , '\\\ 'n \ 'I \ L \ l\ \ it 1 " , " , 1\ 1 " , I ~ I 1\ II '! t 11 I \:'1'\ 1\ , \ 1 11 .,\ \1 , , I , :\' \ I, i " I :\ ' \ II \' ! :IJ "'I : , , 1,\ ! I , I , , , II i \'\ i, , ' , , :\ i '~ <, " "" '~" '<\ \" ,,~, \"-, '. ,- L-____ -: ______ ~----~----"~~ ";'~~~'~,,~ ________ ~ " ," i;; II ~;; 1': .. ' • i -\\ \ I, \ , , \ \ , , , ~ \ , , -~, \ , \ I \ '\ , • I \ \, \ • \ \ \ 'I \ , \, \ i:-\ i.i \ \. \ \ , " I ~ i \ , \ \ \ I -\ ~ \ 5 I , , 1-" a"" \, .' \ • • ! \ • l \ \, • , \ , 'I I II · \ \ .' \ \\ 'I \ \ \ ~~ \ \ " F. \ \ .' \ \ i , , l~ B \ \ 0 , \~ \ i:'i~ / I ,I ~: , ! \ ! '\ / i:" II. i i I I I i I I I I -i i I I i I I I I i I I I i I I I I I Y I I I I I I I ! \ , i I I ~ I I I I I I I I • I I I I I I I I I ,! I I .:0: ~l;: r I = ",§,~ I I:3J ~8 I ~ ;! ,.. i,~ I .. £ I " I ;;.. I I or> 0 I I N " I I I I I I I ~ ..... I I I I I = U I I ~ I \ .s -I I I .. •• or> ..... I I I = u I I I ... ~ I I -I I t;:: -= I I ... ~ "" I := I I ,q j S!~: ~ = .. ... ; I I "" = I I I ...; I U ... I ... \ = I ~; j .~ ... r i ,--,~~----------------------------------~'. \ I' \ \ \ I I fr- I \ I I I I I I ' i,.c. I ""' :J I I I I;: f \: \ i I I : \ 11 ~~ ~ L ____________ ~E:_' __ i~L\ ____________________ ~.~1 "-i Appendix D. HEC-RAS Analysis of Roadway Conveyance Description of inputs: Geometry: Geometry of roadway based on Barghausen Consulting Engineers field survey from 6/07. STA Description 0+00 10' west of CB-11A 1+60 10'west of CB-11 B 6+60 160' east of CB-15A-1 8+10 290' west of CB-18A 1010 85' west of CB-18A Flow: Based on cumulative 100-year peak flow rate to the conveyance system predicted by KCRTS 1- hour time series minus the estimated capacity of the 18-inch pipe on the south side of SE 1441h Street (5.0 cfs). SE /4.f' Slree l -June 2007 SE 144th Roadway Conveyance Plan: SE144th Roadway 6/17/2007 Geom: SE144th Flow : Roadway a 144th1 --- 380 Legend WS Exis Ground ROB 378 376 1 I g c ~ > ~ w 374 372 0 0 0 ~ 'f <D ~ + + + ~ <D <Xl S c7J ~ s '" '" 370 I , 0 200 400 600 800 1000 1200 Main Channel Distance (ft) SE 144th Roadway Conveyance Plan : SE144th Roadway 61 1712007 Geom: SEI444tl flow: ~ay Q Riter ·!«ttl RaIIch " 1 RS · 1010 Sia '0.'0 .02: ,-----t~----------------.,,------",j ~ r .'35 I ~ '" '" E ~ "" ~ ,,. '" 317 378 .., ." ." ,',--------------. io ;. StlIkln (It ) SE 144th Roadway Conveyance Plan : SE l44th Roadway 6/17/2007 Geom: SE,4-41h FIQw: ~ a RNe r a 144111 RNdl s 1 RS a 810 Sta 8 .'0 318 .0 J .m --'I .01 .035 -------..., 3n .5 3n .0 E t 316.5' In 376 .0 375.5 37S_~ 374.5 1 I .., ~ ~ "20 30 .. " ""'" ~) SE 144th Roadway Conveyance Pl an : SE144th Roadway 6/17/2007 Geom: SEI4-4th Flow: Roedway a RNeot'. 144th RNdI . I RS .. 660 sea 0.150 ~.022 .01 .035 --------1 315 .SJ E i 373.' 312.0 WSe.io 0;;;:;;;;- • Bank Sta _ ... WS'" ~ • ,,~ ... .'-"" ws ... 0;;;;;;;- • .. ~ ... ::~. 371 .5 ---_--_~--_--_~---~---_--_---_----, .., _ ~ , " 20 30-.w 50 Stalion (II) SE 1441h Roadway Conveyance Plan: SE1441h Roadway 6117/2007 Geom; SE1441h fbw: Ro&away a Riv.r . 1«11'1 Raad'I" 1 RS . 160 StlI 1*60 ''''j 1--.022 II' .0 1 022------4 314.0 373.5 g 373 .0 ~ 372 .5 j w 372.0 311.5 371 .0 370.5 -30 .,. .'22 312.51 372.0 311 .5 i '" 370.5· 370.0- 3 "'.'J 369.,~l:-----------~..,;o----.., ." '-"" ws Exi. ~ ...:"" " ,. 30 .. 50 Stabon (ltl SE 144th Roadway Conveyance Plan : SE144th Roadway 6117/2007 Geom : sel44th Flow: ~ a River · 1«11'1 RMdl " 1 RS " 0 SUI a.oo ,I ,. --_----+---'''-------1 ~ ~ ; -20 StaIion (11) ~ ~ 00 HEC-RAS Plan: SE144th River: 144th Reach: 1 Profile: Exis - Min eh EI r W.S. Elev -" ~---:---~ 1 Reach River 5ta Profile QTotal CritW.S. E.G. Elev E.G:_Slope Vel Chnl I Flow Area Top Width Frauds # Chi - (ef,) (ft) 1 (ft) 1ft) (ft) Ift/ft) Ift/,) ! I'q ft) 1 (ft) - 1 1010 Exis 20.09 376'0lJ-_.~ 378.44 378.22 376~56 0.005394. 2.69' 7.441 20~06 1.35 -=----~ --~ 376.57' 4.231 1 810 Exis 20.09 376.47 i 376.22 376.22 O.023460i 6.22 0.00 -~-~.--~:c= t--- 0.00687i! --r~ - 1 660 Exls 20.09 373.69! 373.70 373.33 373.64 0.31 6.621 7.791 0~66 1 160 Exis 22.42 370.901 371.63 371.63 371.77 __ 0:002667 i 3.25 7.92 2869 1 1.12 1 0 Exis 22.42 370.701 371.161 371.14 371.27 0.003401 : 3.00 9.76' 44.46 i 1.17 - HEC-RAS Plan: SE144th River: 144th Reach: 1 Profile: Exis ~---~.---- Reach ; River Sta Profile -~c--~- E.G. Elev W.S. Elev Vel Head r Frctn Loss C&ELoss Q Left Q Channel QR ight Top Width ! -- Cj~ --iw1o (ft) --(ft) (ft) (fti. (ft) (cfs) (cis) (cl Exis 378.56 378.44 0.111! 1.97 0.02 0.24 4.43 'sL (ft) 15.42 20.08 1 !810 Exis 376.57 376.22 0.35 1.74 0.06 20.09 6.22 1 '660 Exis 373.84 373.70 0.14 2.07 0.00 0.00 20.09 7.79 -- 1 j 160 Exis 371.77 371.63 0.14 0.50 0.01 0.31 18.59 3.52 28.69 1 10 Exis 371.27 371.16 0.11 I 0.16 15.32 6.93 44.46 TRAFFIC IMPACT ANALYSIS For The Plats of THREADGILL/CAVALLAlLmERTY GARDENS October 31, 2006 Prepared by: G:uy A. Norris, PE, PTOE DN Traffic Consultants PO Box 547 Preston, W A 9~050 Eagle Creek Land Development LLC clo Randy Goodwin. 13701 SE 253'" Street Kent, Washington 98042 IEXPIRES 03/07 /08 MAIN FILE COpy Traffic Impact Analysis Threadgill et al TABLE OF CONTENTS INTRODUCTION .................................................................................................................................... 1 PROJECT DESCRIPTION ......................................................................................................................... 1 EXISTING CONDITIONS ......................................................................................................................... 4 SE 128'" Strcet. ................................................................................................................................... 4 160'" Avenue SE ................................................................................................................................. 4 SE 136th Street .................................................................................................................................... 7 162nd Avenne SE ................................................................................................................................ 7 TransitiNon-Motorized Facilities ............................................................................................................ 7 Transit. ............................................................................................................................................... 7 Traffic Volumes ..................................................................................................................................... 7 Level of Service ...................................................................................................................................... 8 Definition .......................................................................................................................................... 8 Collisions ............................................................................................................................................. 10 Planned and Programmed Improveruents .............................................................................................. 11 FUTURE CONDmONS WITHOUT PROJECT ................................................................................... 11 Backgronnd Traffic Volumes ................................................................................................................ 12 Level of Service: ................................................................................................................................... 12 FUTURE CONDmONS wrrn PROJECT .............................................................................................. 14 Traffic Volumes ................................................................................................................................... 14 Project Trip Generation .................................................................................................................... 14 Trip DistributionITraffic Assignment ................................................................................................... 15 Level of Service .................................................................................................................................... 15 Other Issues ......................................................................................................................................... 18 CONCLUSIONS ...................................................................................................................................... 21 TRAFFIC MITIGATION ......................................................................................................................... 21 DN Traffic Consultants Traffic Impact Analysis Threadgill et aJ INTRODUCTION The following report was prepared to address King County's request for a Level 2 traffic impact analysis for the proposed plats of Threadgill (LOSP0026), Cavalla (L06P001), and Liberty Gardens (L04P0034). The three plats are located on the east side of 162nd Avenue SE between SE 13S th Street and SE 142nd Street in the Renton Highlands area of King County. A vicinity map is presented in Figure 1. King County requested the following information be provided as part of the TIA: • AM and PM peak hour level of service analysis at five study area intersections: o 1 56th Avenue SE/SE 128th Street o 156th Avenue SE/SE 136th Street o 160th Avenue SEiSE 128 th Street o 160th Avenue SEiSE 136th Street o 169th Avenue SE/SE 128th Street • An assessment of the project's impact at the following high accident locations o SR 900/164th Avenue SE o 160th Avenue SE/SE/SE 128th Street o 16200 Avenue SE/SE 128 th Street • An assessment of the potential volume on SE 136th Street with the proposed connection between 164th Avenue SE and 168th Avenue SE This report summarizes the process, findings, conclusions, and recommendations of the traffic analysis performed to address these issues. PROJECT DESCRIPTION King County requested the analysis evaluate the cumulative impact ofthree proposed single family plats. The plats include Liberty Gardens, Cavalla, and Threadgill. The plat of Threadgill is located between 16200 Avenue SE on the west and 164th Avenue SE (extended) on the east; SE 13S th Street (extended) on the north and SE 136th Street (extended) on the south. The proposed plat contains 15 lots on 4.01 acres or 3.75 dwelling units per acre. The plat is zoned R-4 which allows up to 4 dwelling units per acre. Access to the site is provided via 16ZOd Avenue SE which will be improved as part of the plat improvements. All 15 lots are served by an internal access provided by a single 420 foot cul-de-sac which runs east west from 162nd Avenue NE. A site plan is presented in Figure 2. The plat ofCavalla is located between 162nd Avenue SE on the west and 164th Avenue SE (extended) on the east; and SE 138th Street (extended) on the north and SE 140th Street on the south. The plat of Cavalla is proposed for 34 lots. The plat contains approximately nine acres and is zoned R-4 which allows up to 4 dwelling units per acre. Access to the site is provided via DN Traffic Consultants Pa"e 1 DN TRAFFIC CONSUL TANTS .J LIBERTY GARDENS VICINITY MAP FIGURE 1 '---_.) ,. -~ PLAT OF THREADGILL CAVALLA LIBERTY GARDENS , , -:---j ". ---~--J""!"',O~ ON TRAFFIC CONSULTANTS , , i I •• ';"';"",;:":'; I , , , , ------------_____ J SITE PLAN FIGURE 2 PLAT OF THREADGILL , Traffic Impact Analysis Threadgill et a/ 162nd Avenue SE which will be constructed as part of the plat improvements. Internal access is provided by two public roads and seven dedicated tracts. Public Road" A" runs east -west and intersects with 162nd Avenue SE on the west and Public Road"B" on the east. Public Road "B" runs north -south terminating in a cul-de-sac on both ends. A site plan is presented in Figure 3. The plat of Liberty Gardens is located between 162nd Avenue SE on the west and 164th Avenue SE (extended) on the east; and SE 140th Street (extended) on the north and SE 142nd Street on the south. The plat of Liberty Gardens is proposed for 38 lots. The plat contains 9.47 acres and is zoned R-4 which allows up to 4 dwelling units per acre. Access to the site is provided via 162nd Avenue SE which will be constructed as part of the plat improvements. Internal access is provided via SE 140th Place which runs east west terminating in a cul-de-sac; 163 m Avenue SE which runs north -south intersecting with SE 140th Place on the north and SE 141 ~ Place on the south; and SE 141 ~ Place running east-west and terminating in a cul-de-sac on both ends. A site plan is presented in Figure 4. All three plats are expected to be fully occupied by 2008, which for the purposes ofthis analysis is assumed to be the horizon year. EXISTING CONDmONS The Existing Conditions analysis provides a statement of the traffic-related conditions within the study area at the time of the writing of this report. The statement includes a discussion of the existing roadway, transit, pedestrian and bicycle facilities serving the site; identification of existing peak hour traffic volumes and accident history at the analysis intersections; and identification of proposed transportation improvements in the area. Roadways The roadways directly impacted by the proposed development include 162nd Avenue SE, SE 136th Street, and 160th Avenue SE. SE 12Sth Street provides regional access to the site. These roadways are discussed in the following section. SE 128th Street SE 12Sth Street is a four lane principal arterial which runs east-west from approximately 142nd Avenue SE to SE May Valley Road. West of 142nd Avenue SE, SE 12Sth Street becomes NE 4th Street within the City of Renton and continues west to Jefferson Avenue NE where it becomes NE 3'd Street terminating at l-40S. In the vicinity of the plat the roadway is approximately 60 feet wide. There are asphalt paved shoulders at the intersection with 160th Avenue NE. There are left-tum lanes at the intersections with 1 56th Avenue SE and 14Sth Avenue SE. Traffic control includes signals at 14Sth Avenue SE, 1 56th Avenue SE, 16S th Avenue SE and stop signs on the minor intersection streets including 160th Avenue SE. The posted speed limit is 45 mph. J6(fh Avenue SE 160th Avenue SE is a two-lane neighborhood collector that runs north-south from approximately DN Traffic Consultants Page 4 ON TRAFFIC CONSULTANTS SITE PLAN FIGURE 3 PLAT OF CAVALLA /' ;-"-=;;~::~'::;<~~r--o==~~-c, '-~c:Fo_' _ --oC::~::_m __ -===C":7-,~~;~ v' //]""/ ,/ '1Y///,~9/ " ~// , /" / V /" ~/ / 'I" , '//16' /, '1"/11" //, /"'11""" .18 ,J/ to,/ , '" I ,.0 in / • ;; /'/.' " /, K ~(j(//:! '( ;, ___ /0 / ",19 §' \20/ / / / " I . ....---)------,'41' _ .... J A,~ //' ':>~<()-'--/-: 21 ' i "Ii ' '. ,: f. / .! f 75' ) I 22 #1\ I / iL' k ~. / ' : I' \/\~' I" '/J' /~",/ >~~~f .... 0/ \, ~'" / ----.(J ~t?A~r ~ \c '. \ / i IfQ~'iOf&~ (I 0 '.', \ ," I ,( ~1Irr ') " , 16" : 1':': 'I;::; \ \ i -'-" ' ~ i I '. 'I; i 1\ "2 ,It ) 7 I / ", \ i, \ ;' ,b,' \ i 'OI! ioo' lmt ",-", ef R i, '. / ~ , / HlI(/ --/ il/~ 5,' ;~R l--~·· ; ~ I ~'" J~-'------+-----' t I .~:'----_. ~ 70' Ii ' J' ,f " ,--./' ! I!, !l 14' ,),5 I \["\ '. ,,' \~,.-/' \ \ H' ! ! I / lV~' "", // ,/ '~ ", "~ / , :2 //~ [,/ 01 gl['?,,, '~_/ -j -~>~ .... "'. 0 • Jl6 /" ':f"" ,90 ,/-- "0 / I· "'112'0 (100'(;' \. /-'00-:-- "t., _ ~--~ ___ \ _\ \ ''. I \, 105' ~I I\.:: \ ,'---'" " ) / , 37 ) R>" 29'L __ /" I ".' '" 1¢2nd Ave. s'E----..// ' ~ UNI"PROVE~ .• \ '> /' ---'-----\/ / C-4 / '---------, -' ~ 15' BSIlL- ,~ (TYP) i f /; " i' \ .:" 5:" \, i \ '. 23" "/ If On' 100' t \ ~ ,;' ",' .~ 25 ~I~ r "''''-,,"~ n" \,' ! \' " ,I " \ ' . TRAcT ,I' 05 STORM C~AINA~~~EA~ON ' " .• \26 ~ ! I ~ \ / ) T , ~A --1~ -~""'-'---'''_1 11_' '" (/) Z W u.. 0 0::: 0 « f-t? « >---l f-a.. 0::: W CD ::J Z « -.J .q. D-w 0::: ::J W (9 I-G: - (f) (/) 0 f- u.. Z u.. « « f- 0::: --l f-:::> (/) Z Z 0 0 0 Traffic Impact Analysis Threadgill et al SE l281h Street to SE l441h Street. In the vicinity of the site, the roadway width is approximately 20 feet with little or no shoulder. In some locations, the roadway has drainage ditches on both sides. Traffic control includes stop signs at SE 128 1h Street, SE 1441h Street, and on the minor side streets along the corridor. The posted speed limit is 25 mph. SE 13 6th Street SE l361h Street, in the vicinity of the plat, is a two-way local access street that runs east and west from l561h Avenue SE to 162nd Avenue SE. The county has requested the three plats consider extending SE 1361h Street between l641h Avenue SE and l681h Avenue SE. The existing roadway is approximately 18 feet wide with unpaved parking strips in front of the homes on both sides of the street. Traffic control includes a stop sign at the 1561h Avenue SE and l601h Avenue SE intersections. The speed limit is 25 mph. 162nd Avenue SE 16200 Avenue SE, in the vicinity of the plat is a two-way local access street which runs north - south from SE 1341h Street to a point approximately 500 feet south of SE 1371h Place. It is expected that l62nd Avenue SE will be extended to the south per King County Road Standards as part of the proposed plat. There is currently no traffic control along the corridor. The speed limit, although not posted, is 25 mph. TransitINon-Motorized Facilities Transit King County Metro provides transit service in the vicinity of the site. Routes III and 114 provide service along SE 1281h Street and SE 1441h Street. The nearest bus stop to the proposed plat is located on the southeast comer of 1601h Avenue SE and SE l281h Street. During the week, service for Route III runs from 5:45 AM to 8:00 AM and from 4:30 PM to 7:00 PM with approximate 20 -minute headways. Service for Route 114 runs from 6"45 AM to 9:00 AM and from 5:00 PM to 6:30 PM with approximate 30-minute headways. In addition, there is DART service along SE 1281h street, Lake Kathleen Drive, SE 1441h Street, and l561h Avenue SE Monday through Friday. There is no weekend service. Non-Motorized Facilities There are currently no non-motorized facilities in the vicinity of the plat. Traffic Volnmes The existing AM and PM peak hour traffic volumes at the analysis intersections was determined from AM and PM peak period turning movement counts collected during October 2006. The analysis intersections as requested by King County include: DN Trajfic Consultants Page 7 Traffic Impact Analysis o 156th Avenue SE/SE 12Sth Street o 156th Avenue SEiSE 136th Street o 160th Avenue SE/SE 12Sth Street o 160th Avenue SE/SE 136th Street o 169th Avenue SE/SE 12Sth Street The existing AM and PM peak hour volumes are presented in Figure 5. Level of Service Definition Threadgill et at Level of service (LOS) is used to qualify the degree of traffic congestion and driver comfort on streets or at intersections. The Highway Capacity Manual (HCM) describes the methodologies for calculating LOS on street segments and at signalized and unsignalized intersections. According to the 1997 HCM (TRB Special Report #209), there are six levels of service by which the operational performance of the roadway system may be described. These levels of service range from LOS A, which indicates a relatively free-flowing condition, to LOS F that indicates operational breakdown. The level of service for a two-way stop controlled (TWSC) intersection is determined by the computed or measured control delay and is defined for each minor movement. Level of service is not defined for the intersection as a whole. Average control delay less than or equal to 10 seconds per vehicle is defined as LOS A For LOS F the average control delay is greater than 50 seconds per vehicle. The LOS for siguaJized intersections is defined in terms of average control delay per vehicle. The criterion for LOS A is an average control delay ofless than or equal to 10 seconds per vehicle. The criterion for LOS F is an average control delay of greater than SO seconds. Level of service was calculated using Synchro1M s.o computer software program based on the 2000 Highway Capacity Manual. The result of the existing condition level of service analysis is shown in Table 1. King County has adopted level of service E as the county road capacity standard for all intersections. According to the County Code, any development that impacts an intersection with 20 percent of the peak hour project generated trips and 30 project generated peak hour trips must provide a level of service E with full development of the project. If the level of service is below LOS E for the without project condition, the developer is responsible to maintain the existing level of service. DN Traffic Consultants Page 8 (370) 601 -i r (134) 3J6 -. ~ E SE 128th Street (10) 12~ i t r (1) 1 -'" _ '" (18) 20 --, .:::. ;1; .:::. , I"')--Ql -~- (3)4~ i t r (3) 4 -0'" 0 (11) 10 --, 'N~-;:::- l ~~- (XXX) -AM PEAK XXX -PM PEAK ~ON L ~~~ (0) 4 "''''''' ~~~ -(555) 933 j ~ l ,(8) 47 j l -(563) 373 (1) 15~ i t r (793) 768 -t:l '" '" (14)56--, ~S~ , ~-~ (5) 21 ~ (169) 561- '" Vl • , c ~ '" ~ ~ '" '" Vl Vl • • 0 c 0 • c > ~ " " "' ~ w 0 Vl ~ ~ • , SE 132nd Street c • > " "' <D ~ SE 134th Street Threadgill "' o <D '" Vl • o ~ "'1'h47"h1 Cavalla '" Vl • , c • > " "' '" ~ ~ c N <D Liberty Gardens SE 144th Street w Vl • 0 c ~ '" "' '" ~ SE 136th Street DN TRAFFIC CONSUL TANTS 2006 TRAFFIC VOLUME PLAT OF THREADGILL CAVALLA LIBERTY GARDENS FIGURE 5 Traffic Impact Analysis Threadgill et al Table 1. 2006 Level of Service LOS Intersection Traffic Control AM Peak PM Peak 156'" Avenue SEISE 128'" Street Signal2 C(lIO) ])(38.8) 156th Avenue SE/SE 136th Street Stop Sign' C (24.5) F(67.5) 160'" Avenue SEISE 128'" Street Stop sign' D(25.4) F(51.1) 160th Avenue SE/SE 136'" Street Stop Sign' A(9.1) A(9.6) 169'" Avenue SEISE 128'" Street Stop Sign' B(1O.7) A(9.6) (xx) Seconds of delay per vehicle 1 -Level of service for the two-way stop controlled intersection represents the movement with the highest delay. 2 -Level of service for signal controlled intersections represents the total intersection. As shown in Table I, all analysis intersections operate at an acceptable level of service during the AM and PM peak hours with the exception of the 1 56th Avenue SE/SE 136ili Street intersection during the PM peak hour and the 160ili Avenue SEiSE 128ili Street intersection during the same time period. Both intersections currently operate at LOS F during the PM peak. Collisions The latest available three year accident history at the analysis intersections was provided by the King County Department of Transportation (KCDOT). A summary of collisions at each analysis intersection is presented in Table 2. Table 2. Three Year Collision History Intersection 2002 2003 2004 Total Accident Accidents Rate' 156th Avenue SE/SE 128th Street 4 4 4 12 0.463 156 th Avenue SE/SE 136th Street 0 0 0 0 0 160th Avenue SE/SE 128th Street 5 2 4 11 0.531 160th Avenue SE/SE 136'" Street 0 0 0 0 0 169th Avenue SE/SE 128th Street 1 1 0 2 O.DlS 1) Accidents per million entering vehicles As shown in Table 2, there have been a total of twelve collisions at the 156ili Avenue SE/SE 128ili Street intersection during the three year analysis period from January I, 2002 to December 31, DN Traffic Consultants Page 10 Traffic Impact Analysis Threadgill et al 2004. Of these comsions, six (6) were right angle, two (2) were rear end, two (2) were left tum related and one (1 ) hit a fixed object. There have been 11 comsions during the three year analysis period at the 160 th Avenue SE/SE 128th Street intersection. Ofthese collisions, five (5) were rear end, five (5) were left turn, and one (1) was a right angle. There have been two comsions at the 169th Avenue SE/SE 128 th Street intersection. Of these collisions, both were rear end accidents. Although there have been a significant number of accidents at the analysis intersections, an accident rate of 0.531 accidents per million entering vehicles for the 160th Avenue SE/SE 128th Street intersection; 0.463 accidents per million entering vehicles for the 156th Avenue SE/SE 128th Street intersection; and 0.018 accidents per million entering vehicles for the 169th Avenue SE/SE 128 th Street intersection is significantly less than the statewide average for similar intersections of 0.9 to 1.3 accidents per million entering vehicles. Planned and Programmed Improvements According to King County 2006 Update to the 2004 Transportation Needs Report there are three transportation improvement proj ects identified in the vicinity of the site. These projects include: • Project OP-INT-28: 196th Ave SE & SE 128 th StlWay. Operations improvements to be determined including evaluation for tum lanes. Estimated Cost $640,000. • Project OP-RD-21: SE 128th Street From 168 Ave SE to End of 169 Avenue SE. Need for capacity improvements, tum channelization and improved sight distance. Estimated Cost $1,071,000. • Project HAL-16: 160th Avenue SE & SE 128th Street. High priority need for safety improvements including the addition ofleft-turn lane in the westbound/eastbound direction. Estimated Cost $388,000. • Project #401104: 128th Street & 196th Avenue SE. Safety improvements to be determined. Estimated Cost $3,272,000. • Project # SW-28: 196th Avenue SE & SE 128th StreetlWay. Safety improvements to include construction of a traffic signal. Low Priority. No cost estimated provided. • Project #ITS-28: SE 128th Street ITS form 148 th Avenue SE to May Valley Road. Provide Intelligent Transportation System improvements which could include cameras; vehicle detection; synchronize signals; communications. Estimated Cost $3,819,000. FUTURE CONDITIONS WITHOUT PROJECT The future conditions without project analysis provide a discussion of the traffic-related conditions in the horizon year without the proposed project. This section includes a discussion of background traffic volumes and level of service at the analysis intersection. Threadgill et al is expected to be fully occupied by 2008, market permitting. Therefore, 2008 for the purposes of this analysis is considered to be the horizon year. DN Traffic Consultants Page 11 Traffic Impact Analysis Threadgill et at Background Traffic Volumes Background traffic volumes for the 200S without project condition include the 2006 existing AM and PM peak hour traffic volumes plus area-wide traffic growth. There were no "pipeline" projects identified in the vicinity of the site as all three plats are considered in this analysis. A growth factor of6.0 percent per year was applied to the 2006 existing counts to represent area- wide growth. The 6.0 percent factor was obtained by comparing PM peak period counts conducted in 2004 against those conducted in October 2006. Six percent is a relatively high annual growth rate considering the region as a whole is only growing at a rate of three percent per year. It is believed that traffic volumes may have grown significantly during the last two years to "catch up" with other areas as studies done in the 2004 time horizon indicated volumes had actually declined on the SE 12SIh Street corridor. Six percent was applied in this analysis to represent a "worst case" assessment. The 200S without project AM and PM peak hour traffic volumes are shown in Figure 6. Level of Service The 200S background without project AM and PM peak hour level of service at the analysis intersections was calculated using Synchro™ 5.0 computer software program based on the 2000 Highway Capacity Manual. The existing level of service is shown for comparison purposes. The results of the analysis are shown in Table 3. Table 3. 2008 Witbout Project Level of Service Intersection 2006 2008 w/o Project AM PM AM PM 1561h Avenue SEiSE 12Sth Street' C(21.0) D(38S) C(29.9) E(5S.5) 156th Avenue SE/SE 136th Street] C(24.5) F(67.5) D(29.0) F(l22.4) 160th Avenue SE/SE 12S'" Street] D(2S.4) F(51.1) E(36.1) F(96.6) 1601h Avenue SE/SE 136th Streee A(9.1) A(9.6) A(9.2) A(9.7) 169th Avenue SE/SE 12Sth Street] B(lO.7) A(9.6) B(11.0) A(9.S) (xx) Seconds of delay per vehicle I -Level of service for the two-way stop cootrolled intersection represents the movement with the highest delay. 2 -Level of service for signal controlled intersections represents the entire intersection. As shown in Table 3, with the addition of the growth in background traffic, the level of service at the IS61h Avenue SE/SE 12SIh Street intersection during the PM peak hour has dropped from LOS D to LOS E; the LOS at the IS61h Avenue SE/SE 1361h Street intersection dropped from LOS C to LOS D during the AM peak hour and the PM peak hour degraded from LOS F with 67.5 seconds of vehicular delay to 122.4 seconds of vehicular delay; and the 1601h Avenue SE/SE 12SIh Street intersection dropped from LOS D to LOS E during the AM peak and from LOS F DN Traffic Consultants Page 12 • '" -0"1 L '§' 'N'N' (0) 4 ~~~ -(624) 1049 j t l .(9) 53 (1) 17~ I t r (891) 863 _ '" '" '" (16) 63 ---,. ::::0''::: , ::l~:8 ~ ~ ~ L "'~ .::...::.. 1 j l -(633) 419 (6) 24 ~ (190) 653- SE 128th Street '" '" ...,.;:,~ 8EE j t l (11) 13~ (1) 1- (20) 22, (3) 4~ (3) 4- (12) ", L(7) 7 -(0) 1 .(3) 6 I t r .:.~;: c.N'~ "'~ .e ltr (XXX) -AM PEAK XXX -PM PEAK DN TRAFFIC CONSULTANTS w w w if> if> if> W • • if> 0 • 0 c 0 • c C • > ~ • 0 "" > c "" "" ~ ~ w ~ 0 !i w '" ... '" in ~ • £ "' • 0 ~ "' -0 c ~ SE 132nd Street c ~ ~ « « ~ £ ;;; '" ~ ~ SE 134th Street SE 136th Street £ o "' Cavalla Liberty Gardens SE 144th Street 2008 TRAFFIC VOLUMES WIO PROJECT PLAT OF THREADGILL CAVALLA LIBERTY GARDENS FIGURE 6 Traffic Impact Analysis Threadgill et al with 51.1 seconds of vehicular delay to 96.6 seconds of vehicular delay. The LOS at the remaining intersections remained the same during both time periods. FUTURE CONDITIONS WITH PROJECT The future condition with project analysis provides a statement of what traffic related conditions will be like in the horizon year with the project. The analysis simply adds anticipated project impacts to the horizon year background conditions. The analysis defines anticipated project trip generation and evaluates impact through a level of service analysis at each of the analysis intersections. Traffic Volumes Traffic volumes for 2008 with project condition include 2008 without project volumes discussed above plus expected traffic generation for the three plats. Project Trip Generation Trip generation for Threadgill et al was calculated using the trip generation rates for Single- Family Dwelling Units, Land Use Code 210 presented in the Seventh Edition of the Institute of Transportation Engineers Trip Generation Report, 2003. There is an existing mobile home on Threadgill property which will be removed as part of the short plat. Since the unit is the sole mobile home on the property, for trip generation purposes it was treated as a single family dwelling unit. A summary of the anticipated trip generation for Threadgill et al is presented in Table 5. TableS Trip Generation AM Peak PM Peak Land Use AWDT Total In Out Total In Out Threadgill 15 sfdu's 220 11 3 8 15 10 5 Existing Units I sfdu's 10 I -I I I - Threadgill Net Impact 210 10 3 7 14 9 5 Caval1a 34 sfdu's 325 26 7 19 34 21 13 Cavalla Net Impact 325 26 7 19 34 21 13 Liberty Gardens 38 sfdn's 364 29 8 21 38 24 14 Liberty Gardens Net Impact 364 29 8 21 38 24 14 NET NEW TRIPS 899 65 18 47 86 54 32 As shown in Table 5, Threadgill et al is estimated to generate a total of 899 new daily trips, 65 new AM peak trips and 86 new PM peak hour trips on the surrounding street network. Of these, the plat of Threadgill contributes 210 new daily, 10 new AM peak, and 14 new PM peak hour trips; Cavalla contributes 325 new daily, 26 new AM peak, and 34 new PM peak hour trips; and Liberty Gardens contributes 364 new daily, 29 new AM peak, and 38 new PM peak hour trips. DN Traffic Consultants Page 14 Traffic Impact Analysis Threadgill et al Threadgill is credited 10 daily, one AM peak and one PM peak trip resulting from an existing mobile home on the property. Trip Distributionffraffic Assignment Traffic assignment for the proposed plats was based on the trip distribution/traffic assignment results used for the previous Liberty Gardens traffic impact analysis prepared by this consultant. Based on the results of that analysis, 66 percent of the project generated traffic for each of the three plats was assigned to and from the south on 160th " Avenue and 34 percent was assigned to and from the north. This assignment however, was modified based on travel time studies conducted for Liberty Gardens and the plat of Even dell (also conducted by this consultant), in response to expected delays for northbound left turns at the stop sign controlled intersection of 160th Avenue SE/SE 12Sth Street. As a result, northbound traffic on 160th Avenue SE destined westbound on 'SE 12Sth Street is expected to head west on 'SE" 136th Street to access the signal at the 156th Avenue SE/SE 12Sth Street intersection rather than head north on I 60th Avenue SE to avoid the left tum delay. The results of the trip distribution/traffic assignment process for the cumulative AM and PM peak hour project-generated trips for each of the three plats is presented in Figure 7. A summary of the 200S with project AM and PM peak hour volumes are presented in Figure S. Level of Service The 200S with project AM and PM peak hour level of service at the analysis intersection were calculated using SynchroTM 5.0 computer software program based on the 2000 Highway Capacity ManuaL The results of the analysis are shown in Table 6. The existing condition and 200S without project AM and PM peak hour level of service are provided for comparison. Table 6. 2008 With Project Level of Service Intersection 2006 2008 w/o Proj 2008 w/Proj AM PM AM PM AM PM 156th Avenue SE/SE 128th Street2 C(2LO) D(38.8) C(29.9) E(55.5) C(29.9) E(57.7) 156th Avenue SEiSE 136'" Street! C(24.5) F(67.5) D(29.0) F(122.4) D(27.7) F(125.9) With signalization2 B(14.5) 160'" Avenue SE/SE 128'" Streee D(25.4) F(Sl.l) E(36.1) F(96.6) E(36.1) F(102.3) With signalization2 A(5.7) 160th Avenue SEiSE 136th Street! A(9.l) A(9.6) A(9.2) A(9.7) A(9.9) A(lO.O) 169th Avenue SEiSE 128" Street! B(IO.7) A(9.6) B(ILO) A(9.8) B(IU) A(9.8) (xx) Seconds of delay per vehicle 1 -Level of service for the two-way stop controlled intersection represents the movement with the highest delay. 2 -Level of service for signalized iotersection represents the entire iotersection. DN Traffic Consultants Page 15 (4) 10 -i SE 128th Street 117%1 L(8) 6 ~ L(6H ~ _ (8) 6 l t (32) 21 (XXX) -AM PEAK XXX -PM PEAK r w '" • , o ~ .; (4) 10, W (4) (a) d t(2) 8 r "' w '" • , 0 • > .; oS 0 ~ ~~ (2) 2- (2) S1 IN 8 d. /17%1 5-"" (7) w '" • , 0 • > .; ; ~ SE 132nd Street t~§: SE 134th Street S"'J t~SThreadgill (46) ..d w '" • , 0 • > .; oS '" ~ _3 w ~ '" ;;; • , ~ 0 ~ .; ~ ~ W (17) SE 136th Street ~~J t\:.~ w '" oS o '" lHREADGILL CAVALLA LIBERTY GARDENS • , o Cavalla ~ oS 0> '" Liberty Gardens SE 144th Street AM PEAK PM PEAK TOTAL IN OUT TOTAL IN OUT 10 3 7 14 9 5 26 7 19 34 21 13 29 6 21 36 24 14 DN TRAFFIC CONSULTANTS PROJECT GENERATED TRAFFIC PLAT OF THREADGILL CAVALLA LIBERTY GARDENS FIGURE 7 ..., L (O) 4 \::: -0'"" §'~'C;" ~ L(O} 1 '" ~ ~~~ -(624) 1049 c.:::. J!l r (11) 61 Jl -(634) 422 (666) 647-ir (I) 17-' itr (6) 24-' (64) 378, +~ (891) 863-~N~ (192) 655- '""-(20) 73, ~ ~S-;;;-~ .e SE 128th Street (II) 13 -' (I) 1- (20) 22, " itr .... co N L "<D' ~ ..,. (15) 4 ~~~ -(12) 9 J ! l r(35} 22 (3}4-' i t r (3) 4_ (12) 11, (XXX) -AM PEAK XXX -PM PEAK DN TRAFFIC CONSULTANTS w V> W W "' "' w • • V> , • 0 , , • • 0 0 > • ~ , « > 0 « « • > £ w £ « 0 ~ w V> :" "' • m £ :" • , :" <D SE 132nd Street , 0 ~ 0 ~ • > « « ~ £ cO <D :" :" SE 134th Street SE 136th Street Cavalla £ m '" Liberty Gardens SE 144th Street 2008 TRAFFIC VOLUMES WITH PROJECT FIGURE 8 PLAT OF THREADGILL CAVALLA LIBERTY GARDENS Traffic Impact Analysis Threadgill et al As shown in Table 6, the 2008 level of service with the three plats remains the same as the 2008 without project level of service during the AM and PM peak hours. The intersections of l56th Avenue SE/SEl36th Street and l60th Avenue SE/SE l28th Street have an LOS F during the PM peak period. With the addition of a traffic signal at both locations the level of service improves to LOS B at the I 56th Avenue SE/SE 136th Street and LOS A at the 160th Avenue SE/SE 128th Street intersection. The LOS at the remaining intersections remained the same during both time periods. Other Issues Project Impact at High Accident Locations As part ofthis analysis, King County requested an assessment of the three plats impact at "high accident locations" in the vicinity identified as I 60th Avenue SE/SE 128th Street, I 62nd Avenue SE/SE 128th Street and SR 900/164th Avenue SE. The impact in terms of PM peak hour traffic is discussed below. 160th Avenue SE/SE 128 th Street During the latest available three year period, the 160th Avenue SE/SE 128th Street intersection has experienced II collisions resulting in an accident rate of 0.531 accidents per million entering vehicles which is significantly less than the statewide average for similar intersections of 1.3 accidents per million entering vehicles. The three proposed plats are expected to generate a total of 23 PM peak hour trips through this intersection. This compares to a total 2006 PM peak hour volume through the intersection 1891 vehicles. The 23 project generated PM peak hour trips include 10 eastbound right tum trips, eight westbound left tum trips, and 5 northbound right tum trips. Of these trips, 44 percent (38/87 = 0.44) are generated by Liberty Gardens, 39 percent (34/87 = 0.39) by Cavalla, and 17 percent (15/87 = 0 17) by Threadgill. I 62nd Avenue SE/SE 12Sth Street The three plats will contribute approximately 13 PM peak hour trips to the 162nd Avenue SE/SE 128th Street intersection. Of these trips, six are generated by Liberty Gardens, five by Cavalla, and two by Threadgill. These volumes were determined using the percentages discussed above for each of the three plats. 164th Avenue SE/SR 900 Based on the trip distribution/traffic assigmnent analysis conducted for this project, it is estimated the three plats will contribute five PM peak hour trips to this intersection and three AM peak hour trips. Forty four percent of the impact is created by Liberty Gardens; 39 percent by Cavalla; and 17 percent by Threadgill. Project Impact on SE 136h Street Extended King County requested the traffic analysis identifY potential volume on SE 136th Street between 164th Avenue SE and 168th Avenue SE. Currently, SE 136th Street does not exist in this section. DN Traffic Consultants Page 18 Traffic Impact Analysis Threadgill et al To address this issue an evaluation was made of existing traffic assignment patterns in the area, speed limits on critical corridors, and volume of trips generated in the impacted area. The result of the trip distribution/traffic assignment process used for these three plats was employed in this evaluation. Specifically, the trips were assigned 66 percent to the south; 17 percent to the east of 160th Avenue SE; and 17 percent to the west of 156th Avenue SE. The generation of these values is discussed in the Trip DistributionlTraffic Assignment section above. It was observed in the traffic counts conducted for this analysis that traffic volumes drop approximately two thirds between the 1 60th Avenue SE/SE 12Sth Street intersection and the 169th Avenue SE/SE 12Sth Street intersection. This led to a further refinement of the trip distribution to the east of six percent to the north on 164th Avenue SE, six percent to the east on SE 12Sth Street, and five percent on 16S th Avenue SE which runs south ofSE 12Sth Street. The five percent on 16S th Avenue SE is generated in consideration of Liberty High School located at the intersection of 16S th Avenue SE and SE 136th Street. With the opening ofSE 136th Street between164th Avenue SE and 16S th Avenue SE, traffic generated in this area will have the option of using SE 136th Street in lieu of SE 12Sth Street and SE 144th Street, parallel roadways through this area. The evaluation included an assessment of trips generated by the existing houses along the SE 136th Street corridor between 16S th Avenue SE and the existing termini ofSE 136th Street in the vicinity of 166th Avenue SE. Secondly an assessment of trips bound to the north east was made followed by trips bound to l64th Avenue SE; trips bound to SE 12Sth Street west of I 56th Avenue SE, and trips bound to the south of the study area via 169th Avenue SE east of Liberty High School and 1 60th Avenue SE. The number of residences within the study area was determined by using a satellite aerial photo from Google. A travel time analysis of the various routes was conducted using the prevailing speed limits on the available street network. The speed limits included 45 mph on SE 12Sth Street; 35 mph on 156th Avenue SE; and 25 mph on 1 60th Avenue SE, 169th Avenue SE, and SE 144th Street. The speed limit on 16Sth Avenue SE is posted at 30 mph with a second sign to the south requiring 20 mph when children are present. To address this condition, an average speed limit of25 mph was employed in the evaluation. It was assumed that the time penalties associated with the signalized intersections of 16S th Avenue SE/SE 12Sth Street and 156th Avenue SEiSE l2Sth Street would be the same for similar movements. It was also assumed that there would be no left turns from the unsignalized intersections accessing SE 12Sth Street because of the lack of acceptable gaps. Based on the travel time analysis, the following conclusions were reached. • All dwelling units (17) along SE 136th between 16S th Avenue SE and its western termini will use SE 136th Street between 16Sth Avenue SE and 164th Avenue SE. This results in 17 (17 units * 1.01 trips per unit) PM peak hour trips on SE 136th Street. • For trips destined to 164th Avenue SE north of SE 12Sth Street, the dividing line isl64th Avenue SE extended to 'SE 136th Street such that all trips generated east ofthat point will head north on 16S th Avenue SE and then west on SE 12Sth Street and all trips generated west of that point will head north on 160th Avenue SE and then east on SE 12Sth Street to access 164th Avenue SE. Since there are the same 17 residential units in this area as DN Traffic Consultants Page 19 Traffic Impact Analysis Threadgill et aJ identified above the result is no additional trips to SE 136th Street. There is also no reduction in trips through the "high accident locations" on SE 12Sth Street. • For trips heading east of 16Sth Avenue SE on SE 12Sth Street, the dividing line is the mid point between 16200 Avenue SE and 163'" Avenue SE on SE 136th Street such that all trips generated east of this point will head north on 16Sth Street and then head east on SE 12Sth Street. There are two additional single family residences between 164th Avenue SE extended and the midpoint between 162nd Avenue SE and 163'" Avenue SE resulting in no new trips to SE 136th Street assuming 1.01 trips per unit factored by six percent representing the distribution to the east of 168 th Avenue SE (2 sfdu's*1.01 * 0.06 =0.12). The trips generated by the two residential units would be eliminated from the 'high accident locations" on SE 128 th Street. • For trips heading west of1S6th Avenue SE on SE 12Sth Street, the dividing line is midway between 166th Avenue SE extended and 167th Avenue SE extended such that all trips generated east of this point will head north on 168 th Avenue SE and then west on SE 128 th Street and trips generated west of this point will head west to lS6th Avenue SE and then north to SE 128th Street. This results in three of the 17 residential units using 168th Avenue SE thereby generating no new trips on the corridor. This however would result in a reduction of approximately two (14 sfdu's * 1.01* 0.17 = 2.4) PM peak hour trips through the "high accident locations" on SE 128 th Street. • For trips heading to the south, the dividing line is the 169th Avenue SE/SE 136th Street intersection such that all trips generated east of this point will head south on 169th Avenue SE to SE 144th Street and then west to lS6th Avenue SE and trips generated west of this point will head west to 160th Avenue SE and then south to SE 144th Street. Under this scenario, all trips generated along the SE 136th corridor between 164th Avenue SE and 1 69th Avenue SE will head west on SE 136th Street and then south on 160th Avenue SE. In addition, traffic generated along168th Avenue SE between SE 136th Street and SE 128th Street will use SE 136th for access to the south via 160th Avenue SE. This also includes traffic generated on east -west streets which access 16Sth Avenue SE between 164th Avenue SE and 169th Avenue SE. The net impact is 40 additional single family dwelling units will use SE 136th Street. This results in an additional 27 (40 sfdu's *1.01 *0.66 = 27) PM peak hour trips. Reassignment of these trips is unlikely to impact the "high accident locations" on SE 128th Street because they most likely currently use 169th Avenue SE for access to SE 144th Street thereby avoiding SE 12Sth Street. • The other factor impacting trips on the proposed SE 136th Street connection includes school trips. The western boundary of Liberty High School is lS8th Avenue SE which is 10 blocks from the high school. Currently these students are bussed to the school. With the extension ofSE 136th Street all of the students west of the school could potentially walk as they would live within the one mile "no bussing" area although some would drive and some are driven by parents. Even so, if SE 136th Street is constructed between 164 th Avenue SE and 168th Avenue SE it is expected that vehicular trips to the school will be reduced. An assumption of school trips from this area based on the assumption there are 120 single family dwelling units in the area between lS8th Avenue SE on the west, SE 144th Street on the south and SE 13200 Street on the north and 0.2 high school students DN Traffic Consultants Pa?,e 20 Traffic Impact Analysis Threadgill et al per household which yields 24 high school students. Using ITE trip generation rates for high school students (0.53 trips during AM and 0.15 trips during PM), yields 13 AM trips and four PM peak hour trips which could be potentially removed from SE 128 th Street although many ofthese trips are likely being made via SE 144th Street and 169th Avenue SE. The conclusion of this analysis is that the PM peak hour volume on SE 136th Street in the section between 164th Avenue SE and 16Sth Avenue SE is expected to be in the range of 40 to 50 trips or a daily volume of379 to 474. In addition, based on the travel time analysis, traffic generated by the proposed plats would not use this roadway except for an occasional trip to Liberty High School or Briarwood Elementary. It is unlikely the extension of SE 136th Street would provide any measurable reduction in peak hour trips through the "high accident locations" on SE 128th Street. CONCLUSIONS The three plats of Threadgill, Cavalla, and Liberty Gardens will not create a significant adverse impact on the surrounding transportation network. The three plats will add a total of 899 daily, 65 AM peak and 86 PM peak hour trips to the surrounding network. The 160th Avenue SE/SE 128th Street intersection and 1 56th Avenue SE/SE 136th Street intersections currently operate at LOS F during the PM peak hour. With signalization of these intersections in 2008 with the project, both intersections will operate at relatively high and acceptable levels of service. All other intersections are within acceptable limits. It should be noted that the individual plats do not generate sufficient volume through these intersections to warrant mitigation according to King County's 30/20 rule. The three plats will contribute PM peak hour traffic to the existing "high accident locations" on SE 128th Street. The three plats will add a total of23 PM peak hour trips to the 160th Avenue SE/SE 128th Street intersection and 13 PM peak hour trips to the 162nd Avenue SEiSE 128th Street intersection. In addition, the plats will contribute five PM peak hour trips to the l64th Avenue SE/SR 900 intersection. The relative share is 44 percent for Liberty Gardens, 39 percent for Cavalla, and 17 percent for Threadgill. An evaluation of the impact of extending SE 136th Street between 164th Avenue SE and 168 th Avenue SE indicates that such a connection would realize a volume of up to 474 vehicles per day. However, it is unlikely that it would produce any measurable reduction of trips on SE 128th Street through the "high accident locations" of I 60th Avenue SE and 162M Avenue SE. There were no other project related traffic issues identified. TRAFFIC MITIGATION The three plats will be required to pay a MPS mitigation fee of 0[$186,093 based on $2,139 per unit (87 units) for concurrency zone 452. Of this Threadgill would pay $32,085 based on 15 units, Cavalla would pay $72,726 based on 34 units, and Liberty Gardens would pay $81,282 based on 38 units. DN Traffic Consultants Page 21 Traffic Impact Analysis Threadgill el al In addition to the MPS fee, the three plats will be required to pay a pro rata share of the cost of the improvements at the 14Sth Avenue SEISR 900 intersection based on their impact to the 164th Avenue SE/SR 900 intersection. No other mitigation is required. DN Trqffic Consultants' Page 22 Traffic Impact Analysis DN Traffic Consultants Threadgill et al TECHNICAL APPENDIX for THREADGILL ET AL Threadgill Et AI SE 128th Streetl156th Avenue SE AM Peak Hour: 6:45 AM -7:45 AM Date Collected: 10/9106 EBlT EBT EBRT ... '" '" a. ~ « 0> c:: 'V5 'x w '" 0 0 '" 0 572 57 WBlT~ WBT 370 WBRT 0 NBlT@d NBT 0 NBRT 392 .s= ~ 0 ~ Cl "0 c:: " e C> ... <> '" aJ 0 71 7 rn 46 0 bl3 49 tl Q) 0e- a. -" 0 .s= ~ co 0 0 '" 0 643 64 ~ 416 0 b!a 441 '" c:: Q) "E to '0. "0 OJ l'O .s= I- .!!l 0; > OJ (.) Cl e- '" .0 ::::; 1 1 2 §§§ BaB SBlT ffi ffiffi§§§ SBT 0 SBRT 0 1900 236 2136 2 4 6 '" '" U) '" u '" °e a. .s= ~ co 0 0 '" ~ 0 U OJ LL ~ " 0 I ... '" Q) a. " aJ -~ <> " ~ I--c:: Q) ~ '" a. 0 647 0.66 11.80 64 ~ ~~ 416 0 14~0 I 441 ~~ UBI ~~ Threadgill Et AI SE 128th Streetl160th Avenue SE AM Peak Hour: 6:30 AM -7:30 AM Date Collected: 10/4106 EBLT EBT EBRT -'" co Q) 0.. :;;; .0:: Ol c:: :;::; (/) ;B to a a '" 1 793 14 WBLT~ WBT 555 WBRT 0 NBLTrn NBT 0 NBRT 50 SBLT rn SBT 2 SBRT 9 1463 .<:: '3 e Cl '0 c:: '" e ff 0 co m u Q) 'e- 0.. 'S 0 .<:: ~ (I() a a '" 0 1 98 891 2 16 16~ 1 16~41 rn rn 56 rn 11;0 1 181 1644 (/) ., (/) (/) 'CD -0 co ~ .<:: ..... Jg co > co u (/) c:: ., -g co Cl ~ ., .c ::i u ., "e-o.. .<:: ~ (I() a a '" ~ 0 U co LL. ~ '" 0 I -'" co ., 0.. '" m u; -'" 0 '" ~ ..... -c:: ~ ., 0.. 1 891 0.92 0.50 1 1 2 20 §aa ~ 6~4 ~~ §§§ rn 63 ~~ §§§ ; ~~ 2 10 2 5 6 1657 Threadgill Et AI SE 128th Streetl169th Avenue SE AM Peak Hour: 6:30 AM -7:30 AM Date Collected: 10/5106 EBLT EBT EBRT -'" '" "' a. ::;; « <0 0 0 N 5 169 0 WBLT~ WBT 563 WBRT 0 .<:: ~ C> "C c: '" 0 ~ ~ <> '" III 1 21 0 17g 1 t) "' .e- a. -'" 0 .<:: ~ 00 0 0 N 6 190 0 1+1 '" "' VJ VJ =a "C '" ~ t= .!!! 0; > '" 0 '" c: "' "E '" C> ,., 1:: "' .0 ::; t) "' "e-o. .<:: ~ (Xl 0 0 N ~ 0 t) os LL ~ '" 0 I -'" '" "' a. '" III -'" -'" <> '" ~ f--c: "' <> ~ "' a. 6 0 1 1 192 0.92 0.70 0 BB~ 16~41 ~~ NBLTrn rnrnBBBrn~~ NBT 0 NBRT 0 SBLT~ ffi rn BBB rn ~~ SBT 0 SBRT 14 752 93 845 0 1 2 848 Threadgill Et AI SE 136th Streetl156th Avenue SE AM Peak Hour: 6:45 AM -7:45 AM Date Collected: 10/11/06 EBLT EBT EBRT .>t:. '" Q) Il. :. « OJ c:: ~ ·x w '" 0 0 '" lD 1 18 s= ~ C> "0 c:: :::l e OJ tl '" !D 1 0 2 u Q) "e- ll. -:::l 0 s= ~ co 0 0 '" 11 1 20 II) c:: Q) "E ., ·0 C> "0 ., ~ s= f- ;., 1:: Q) .c ::::; WBLTrn ffiffi@§@ WBT 0 WBRT 6 NBLT~ 1+1 19;21 BBB NBT B29 NBRT 9 10 SBLT~ 12: 1 12!1 1 BBB SBT lBB SBRT 2 1072 133 1205 1 3 4 II) Q) II) II) u Q) "e- ll. ~ 0 U '" u. :::l !D -~ <.) :::l s= ~ co 0 0 '" ~ :::l 0 :c .>t:. '" Q) Il. ~ f--c:: Q) t! Q) Il. 11 1 0.92 0.50 20 11~5 1 ~~ 1 9;2 1 10 ~~ 3 ~~ 211 2 1213 Threadgill Et AI SE 136th Streetl160th Avenue SE AM Peak Hour: 6:30 AM -7:30 AM Date Collected: 10/9/06 EBLT EBT EBRT -'" '" Q) 0- :2 4: C> c:: ~ 'x W <D 0 0 '" 3 3 11 .c; 3' 0 ~ Cl "C c:: :::J e ~ " '" In 0 0 1 13 Q) .0' ~ 0- ~ :::J 0 .c; ~ ~ a> 0 0 '" 3 3 12 II) c Q) "E '" .", Cl "C '" ~ .c; I- ~ Q) .0 ::; WBLTE§ rnrnE§ I ¥ I I ¥ I WBT 4 WBRT 8 NBLTrn rn rn W@@ NBT 48 54 NBRT 1 1 SBLT rn rn I f I Baa SBT 42 SBRT 5 140 17 157 8 26 29 II) '" II) II) 13 '" '0' ~ 0- .c; ~ a> 0 0 '" ~ ~ '" u.. ~ :::J 0 I -'" .. '" 0- :::J In -<J) -'" " :::J ~ I- ~ c Q) " ~ '" 0- 3 3 0.66 11.80 12 §§ 15 ~~ 00 ~~ 54 13 I ~ I ~~ 220 C/lC/lC/l til til til ~-l!:j ~HoH ~HOH ~HOH zzz ~~~ til til til til til ;o-l, fi -l -l ~ NOO 0",,,, N CO "'~ COJo:TJ LCL1 CLLJ ~N "'0'" -..I C1> 00 ... O ... c:o co ... mmm til til til ;O-l, -l -l '" 8 '" ° '" ~ 2006 Existing PM Peak §flOfBackground Growth "'''' ° 2008 Without Project -..1-..1 0>'" L-'---._._- "'ITIJ 0] ITIJI '---'--'-H -'----IThread_gill _ "'ITIJ [I] ITIJ ,---,--,-I H -'----IC8V811_8 _ -..IITIJ ITE ITIJ I H ILibertYGardenS I~HOH [tlJN "'0'" -..I ~ 00 ... o ... c:o co ... ~ 0> L- '" 2008 With Project 8l ° -.. __ ._---------- II~IIII~IIII~II rlil peak Hour Factor ITIJoooo ° '" Percent Trucks/Busses ° -- 0.,,(11-1 a. 0: m:::r tD "0 .... ., (') .. ... III o AI 00 S» =~:;Q, !t S (II '9. .. c"'-A-:"'! ~ m (I) .... C; c:t» _ .. ...lII._ !:e .. U'I ",_en cnCII:t "II» 3:< , (I) UI::I •• C -(I) UI(II "11m 3: Threadgill Et AI SE 128th Streetl160th Avenue SE PM Peak Hour: 5:00 PM -6:00 PM Date Collected: 1014106 EBLT EBT EBRT .>< til '" a. :2 a. Cl c :;::; '" ·x W <0 0 0 N 15 768 56 WBLT~ WBT 933 WBRT 4 NBLTrn NBT 2 NBRT 29 SBLT~ SBT 0 SBRT 12 1891 .J:: ~ 2 (9 -a c :::l e ~ <.) til m 2 95 7 1+1 rn rn 234 t5 '" "e-a. -:::l 0 .c -:;;: co 0 0 N 17 863 63 ~ 10;9 ~ 33 11~ I 2125 '" Q) '" '" ·0 -a til ~ .<= I- .!ll ~ til U '" c '" "E til (9 '"' 1: '" .0 ::i t5 '" "e a. .J:: ~ co 0 0 N ~ 0 13 OJ u. ~ :::l 0 I .>< OJ '" a. :::l m -'" .>< <.) :::l ~ I--c Q) <.) ~ Q) a. 17 863 0.88 2.50 2 4 4 73 Baa ~ 1~49 ~~ §§§ I! I ~~ ~H~~~W~~ Threadgill Et AI SE 128th Streetl169th Avenue SE PM Peak Hour: 5:00 PM -6:00 PM Date Collected: 10/11/06 EBlT EBT EBRT -'" '" II) a. ::2; a. '" <= :;:; ,!Q ilS <0 0 0 '" 21 581 0 WBlT~ WBT 373 WBRT 0 .s:;; "§: e (!) u II) 'e- ll. -"C <= ::J e Sf r.:> '" m ::J 0 .s:;; ~ IX) 0 0 '" 3 24 72 653 0 0 1 ~ 1 1+1 III Q) '" III '0> "C '" ~ .s:;; I- .!!! ~ '" u III <= II) "E '" (!) ~ II) .c :.:::; u II) .~ a. .s:;; ~ IX) 0 0 '" ~ 0 U '" u. ~ ::J 0 J: -'" '" II) a. ::J m -~ (J 2 I--<= Q) r.:> ~ Q) a. 24 1 1 655 0.92 0.70 0 §§§ 14~21 ~~ NBlT rn rnrn§§§rn~§3 NBT 0 NBRT 0 SBlT rn ~ 11~ 1 §§§ ; ~§3 SBT 0 0 SBRT 15 17 990 123 1113 0 2 3 1118 • Threadgill Et AI SE 136th Streetl156th Avenue SE PM Peak Hour: 5:00 PM -6:00 PM Date Collected: 10/10/06 EBLT EBT EBRT -'" '" '" c.. :2 c.. 0) c: '';:; '" 'x w w a a N 12 1 20 .c: ~ 0 ~ Cl u c: " e ~ 0 '" III 1 0 2 u '" B ~ c.. -" 0 .c: -~ co a a N 13 1 22 '" c: '" 1:< '" '6> u '" ~ .c: I- .!l! 1 o Cl ,., 1:: '" .0 ::J WBLffi ~rn§§§ WBT 1 WBR 6 NBLT~ 1 ~ I ~ BBB NBT 341 383 NBRT 15 17 SBLT~ 1+1 1 ~31 BBB SBT 821 SBRT 4 1259 156 1415 1 2 3 <I) '" '" '" u '" "e-c.. .c: -~ co a a N ~ 0 U '" u. ~ " 0 I -'" '" '" c.. " III -~ 0 " ~ l- e '" e '" c.. 13 1 0.77 0.00 22 rn ~~ ~ ~~ 383 17 22 ~~ 923 4 1421 • Threadgill Et AI SE 136th Streetl160th Avenue SE PM Peak Hour: 4:30 PM -5:30 PM Date Collected: 10/9/06 EBLT EBT EBRT .>< '" '" n. ::;; n. 0> <:: ~ ·x W to 0 0 N 4 4 10 .<= ~ e C> '" <:: :::l e 0> .>< () Ol !D a a 1 -0 '" .e- n. -:::l 0 .<= -~ '" 0 0 N 4 4 11 '" <:: '" -e '" .5> C> '" '" '" ~ .<= I- » 1:: '" .c ::J WBLTffi rnEE~rnrn WBT 3 WBRT a NBLT~ ffi \ ~ \ W@@ NBT 25 NBRT a SBLT~ ~ \6; \ Baa SBT 60 SBRT 6 118 15 133 10 34 38 '" Q) '" '" -0 '" "e-n. .<= ~ '" 0 0 N ~ 0 -0 Ol LL ~ :::l 0 I .>< Ol '" n. :::l !D ~ '" .>< () :::l ~ I--<:: '" e '" n. 4 4 0.53 a 11 \ y \ ~~ ~ 36 ~~ W ~~ 67 2~5 Threadgill et al SE 128th SU156th Avenue SE - Lane Configurations tt+ 'I tt 'I r Id ~iifFloW(~phl?l) .'-v ~f9:g.P ,~19"00 . J~9J:l,~L19Q6 1900 19(J ~?5'1.··;':· ):" Lane W idth 11 11 11 11 11 11 Total Lost'ti(l)e (S) ~4 ,i:l -> (0 ' '~·9~ ,,:1;"', Lane Ut iL Fa ctor 1. 0.95 1.00 1.00 F.rl'·".,:: '. ", . ·0 :§,9 ~~·.c"~HQb !i;~1.Q(;l-:,?:1,dlP ,.T0 :85~~~'h," . :" .. _ ," """ ~'J ~Al H :.' ;;c ,'d .•. " .',' '..J ,.~ ••• ~: i. "',' ~ Fit Protected 1.00 0 .95 1.00 0,95 1.00 SaId. FI6~,(prot) .1 ".,~ ?,(iJ~ ," R,i:l1'{1;l t,,3'1;21 . 17.1'1 "l~j1 ~~:d '»T;':~ Fit Permitted 1.00 0 .95 1.00 0.95 1.00 S'qtct':EloW(perm U ' ,~; ':r0'73r " '1:r11 '-~42t : 'J 71..1 ' 1!)31 ~_ '. , .... Volume (vph) 572 57 134 370 375 392 p"'ea~.n ourfactor, pJ;-l.F 7' IO"g:;'I, .... Q.;.!!.?· 0(~.f11<·:d,9? ..•. , b'.92 '9 :92 ' -Jf~<'-:_ Adj. Flow (vph) 622 62 146 402 408 426 ,[an~(er{jup'Flb)v CvpAj iril~~~6 ~~ 41'12 ,..;,; 40,8 ·,:!;:@8r~~'I>~;;;\L;.~ . ( Heavy Vehicles (%) 12% 12 % 2% 2% 2% 2% T.uri\T~p'~:· , -' ~" Per!I!1<:! ... Protected Phases 8 2 PerdJitied Phases , , j,:-"" Actuated Green, G (s) 13 .8 4.1 21.9 14 .0 ,ZJi, :--.0: 14.0 ~ffe,ctive .Green, g(\;):, t3]' -~~il' ':ji~,/; 21 ,9 14 .p~~" l ~m~,,;, ::,. Actuated glC Ratio 0.31 0.09 0.50 0.32 0.32 Clearance Time (s) j<lTb'.l~~:~_:.'-4 :0 4.0 4 .0 4.0 ." I i Vehicle Extension (s) 3.0 3.0 3.0 3.0 3.0 Lane Grp Cap (vph) 9.6[ -160'" 1707 546 488 ~ .C;' i', vis Ratio Prot c0.22 cO.09 0 .1 2 0.24 v/sRatio. Perm vic Ratio Ll~,lfor,m Delay, d1 _. Progression Factor iri,cr~rrental Delay, d2' Dela y (s) ~ilVe ~ o(SerVice •. : Approach Delay (s) Ap"roach ;\"~S ., Volume to Capal:ity O. !,-ctuated Cycle ~~'f:'''i:g~~ Intersection Capa':ity Ut ili z"tio,n c. 'Critic'!l LaneGroup Gary Norris GARRYSBELL·ST51 0.24 0.75 • Slim oflost ijini[(SJ.&··,,··, ICU Level of Serv ice ',' .'$li:!£-i'-'. 2006 Existing AM Peak October 2006 Synchro 5 Report Threadgill et al SE 128th Stl156th Avenue SE 2008 w/o Project AM Peak October 2006 - Lane Co nfi gu ratio ns Id ~a! Flow {vplip'tF t ,'" "":C'~'i~ Lane Width 1 T <j tal ,Losqini~tl,(§ i. ~,i.111'O: ' ~ La ne Uti I. Fac tor 0.95 Frt'> /.\,' .... ~: ··",,/'z.t';!?n-0 ~9 -9 ·'·: . " , ,'1' '0-0 ;<"'1 '0'~07}';'ir 1 rO'O "~ '''0 85"';' ", 'r""".·.'./~;i§"."-4:-".'.S;.~-_ .... ':;1~.~·!.f~:~~.~ ... i,,t:.-u •• , r' > .• ', •. -,~ ·~~~~~i.~ ... ..lo-·<-.,-,,<>~' 'r.',," j~ ,.:~.~ , '!t:f .. :.'"" .:-~--• ,: .-". -..", .:'_ .. -_ ..,';"~,,,._ ,,,.Ii);-:": Fit Prot ec ted 1.00 0 .95 1 .00 0.95 1.00 .satd ... Flow (p r.4U ii1~~!Q1:~:'" ··."71 j'11 ,;;"'-34'2 1 J 2 1J .Jf.153'tp·,,·!:,ii, ~~ ,. Fit Permi tted 1.00 0 .9 5 1.00 0.95 1.00 Satd . FI6,w(per nW ' 1i1r:lQj~'f'_: -i';r 1~11 ,';342 11 1 71 jJ1f1:g;>.1.'c.i 4 B' fer",," Vo lum e (v ph ) 643 64 151 416 422 441 Pea k.ho'urJactoU: PJ:lF t2 j!i,:92.' O,}il 2. ',(C~2 'O.Q2 0))2 ~,\'O.92; :o'~,"'1\"y:"i~!~GI Adj . Fl ow (vph ) 699 70 164 452 459 479 Lane Group Fl ow ('1[t1l<'·'i,!.~.9,', .0-,164 · 452'f,r.:-~~~r.:',';479/-' .. Heavy Ve hi c les (%) 12 % 12 % 2% 2% 2% 2% Turn Ty pe -+ ~~~:;~.~ ""'Prot . )? '''\.;:: ~.h_.·:,,'P ¢'~m , ~ ......... -~~;~ •.• __ 't, 1.-' I.1. _~ Pr otect ed Ph ase s 4 3 8 2 Pe,rm'itted Phas !l ~:"T:: ,,-'>',',:' Ac tu ated Gree n , G (s) 14.7 Ef(e'ctive Gniej1, :9.:.1~E;,), :)4;Z'; Ac tu ated glC Ratio 0.32 Clearance Time '(il) --~l .4.o ' Ve hic le Extension '(s)-3.0 Lilne Grp C;;ap (vph) ~;t":9,9 3-' vis Ratio Prot cO.25 vi s Rat io Perm :', 'a:"'~¥L.J{~ c' vic Ra tio 0 .77 l)niform Delay;, if1,,t~'it!\j;~"~';9 " .. Pr ogr ess ion Fac tor 1 .00 1~i:;re r]1 ental De!a )'...d~)~'-k~;8 ·. Delay (s ) 17.7 L,eve,l of S~R'l'l.~~il&j ,~!fj :s";; "': Ap pro ac h De la y (s) 17.7 Appfoach L'o'S;~~~B ;';< 150 ' 1t07 "~ .557 c O.10 0.13 0.2 7 0.82 11:.1 0.33 4 ,0 3.0 031: 0.9 6 . , , ,. HCM Volume to Capacity ratio Actuated Cycle ~eEgi ff (sIfl ,Y;:' Inte rse cti on Capa city Utilization c CritiCal L i~lI1e Group ' ''''( , 0 ,9 0 45:~~. 66.0% ",:,S"U rn;qf.'rbs ttim~ (s)yl'~r~~: -i' 1 ~~0 " kf, ., ICU Le vel of Service B .. . ~-~ '.~-' .< ,·1 t :~." ) . 0.:',;" •• 1 '7 ~~ .... ""... ,,.~ • '''0\ ,0-1 Gary Norri s GARRYSBELL·ST51 Syn chro 5 Report Threadgill et al SE 128th Stl156th Avenue SE - 2008 w/Proje ct AM Peak October 2006 f{tt ,iii~~;~r:~t .'i,4~:~~~~O~ 9-9J~Eff;_;::~fr;:F1:·Q91.~1 .'I!fq"~' 1,. 9d;ifti;~9 ·)~flJt~~~;~~· i&:.:r~P;f,~' -l~ 'f;' .;~:;~}~~~~~~_~~ Fit Protected 100 0.9 5 1.00 0 .95 1.00 p~1iL 'FI'2~ (pFo Q;>1l:~,~·~,,;~,o.7,~~~;~~r~\~tlJ. ~;4?j ;-;t, 1ffJ~Ji1:~-~ 1~~JJ~;r.;,¥;j'li;~":'!i~,'~k ;if1~:'ii qd{r¢~;lIjl Fit Permitted 1.00 0 .9 5 1.0 0 0 .95 1.00 Vo lume (vph) 647 64 151 416 Pf')aKlhdU r factor;J?HF;;'''1.. 0 .. 92 \'" 0::9'2 ', -0 :92 "" 0 .92 ... " .. -----.--~~ ~-"..,., ....... -- Adj . Flow (vph) 703 70 164 452 467 479 I'.§,~ G~p FloW (Vptjj '''1::''fy? -.:_~Q~;: 1,~~i:';:{52 :!, 467, -, ·479 Heavy Vehi cles (%) 12 % 12 % 2% 2% 2% 2% t."Cjne G[p ~ap (vph) . ".': g"~f1 ~~:" ·~<J.50 . 1703 5QO:,': vIs Ra tio Prot c0.25 cO.1O 0 .13 ;'~5 Raiio ~rn: .' ~ vIc Ra ti o 0.78 1.09 ~~,-.... .,. -, .. S!\?lI"""""'--,. W;l iforni,Oelay , d1 , ". .J.'!}) ".~ "w-::,".· 20.8, Progre ss ion Factor 1.00 1.00 Inp"e'fu ent@~l~f, d2 ,.~~. 4 :~~<::i~fdO.7 ;": .0.1 , > Delay (5) 18 .0 121.5 6.7 24.6 44.5 kev~"6f SerV ide-.r,.· .. ~ E "'"'_ ~ .r.. ~'-'.... • Approach Del ay (5 ) ~p.pLo~J9S:"', . S~m :pf!o5t tLf1le ~ififJil'!\t-iilf1 JrJ 2.0) ;l'i \,:,~: !"J"'i.P.·;;M,,"'" Gary Norris GARRYSBELL·ST51 leu Level of Service B Synchro 5 Report Threadgill et al SE 128th St/156th Avenue SE Lane Configurations !~e!l(Row Jvplipl) '~. ';:~7'~1!~~~~J Lane Width To'ta r~o. st, timil. (s) : .• ,~.lI.O ?i'''.k"i''''' 4.0 ;;-:::4Xj ~:,.;.4.0 ::l.. • _ _ . ~:~, ~ ..... ;r._),1l!".' .'<>".'Ct~· .. ><I> ..... ,. Lan e Uti!. Factor 0.95 1.00 0.95 1.00 G'rtj,liI,*:f:;:.i . ",f;\l~(r9~i:~:~t,:, tOO ,1JJ,9,!1\, f ,<l2.' Q],~f,~:'>: ," Fit Protected 1.00 0.95 1.00 0.95 100 S,at<t F\o"i/'{prqt) :~ ·,~""2lj~~~ffl"~k1/171.1.; {42 1 ~'\ 17.11 T!?.3Ji2,f~ Fit Permitted 1.00 0.95 1.0 0 0.95 1.00 ~at(:I< F.liiw.(perm)·' -:;:.:... 2g4 ~·~r··'.,111 '1 ,,::\,!2~1 .,,1711 1531 fA' : _ Vo lum e (vph) 601 336 431 666 209 122 P~:hour fa ~to r. PHF _;P:9,m.~2,;:\0.~2 ,1.,092 ';:(0.92 ....§.'ij~!\i;t",'! ',. ,"'. Adj. Flow (vph) 653 365 468 724 227 133 ~~~l3 iiJup Flo~ fvp h)13.w.r8_'Q.~r 49801.,\!.l 6?t;;~~~t. Heavy Vehicles (%) 12% 12 % 2% 2% turn '(ype -" Protected Ph ases R •• Eirm,itied Phases 1:' '."'" , . ' .. ,.''.1~-~ 2% Actuated Green, G (s) 22.1 19.8 45.9 13.0 2% '2~ ;,{., 130 ~1f~c,tlv,eGr~en. 9 (s) '~-"22 ~';:, '.,:19~ '::45:~'7 f "3: .• 0~,~ Actuated glC Ratio 0.33 0.30 0.69 0 .19 ;€lea r5!nce Tim e (s) '1 . .0 ',h'.i '4.0 ,4.0 " -4"'0 Vehicle Exten sion (s) 3.0 3.0 3.0 3.0 -;4 {~~ -. 3.0 t,a ne Grp Cap (vph) . g74~" " 506 23;17 332~ .,298 ' ~ vis Ratio Prot cO.35 c027 021 cO .13 v/~:g~tip' Perm vic Ratio !iJ,ii!!q rm D ~iay , d1 Progression Fac tor 1 .00 1.00 1~'&::em_enta lD,elay. d?~'=-:11:~;~~lf,r,.,·22.8 , Delay (s) 63.7 45 .6 Eeve bflService ;:"h, -E, -·n :: ...... -,,"-_ ~ ... ~'f _-ft~ , Approach Delay (s) 63.7 App!~6~~Gh LQS >:"!~~t;f&l$ HCM Volume to Capacity ratio 0.92 ~ ... ActL!.ate-dCyc le Length~ (s1lt}~ ,,--'J {6~9 , ·.",;,-s,u)1i:W,'Jio§t.firri e.[s'j ":" Intersection Capacit y Util ization 78.3% ICU Level of Service c~~" ~~itical La ne Group -< ~,~::;c: .. '-"'~> < ~:~~~ :r[~ !'~~ .. ~. :~.)J£l~~:;--· Gary Norris GARRYSBELL·ST51 2006 Existing PM Peak October 2006 Synchro 5 Report Threadgill et al SE 128th SU156th Avenue SE 2008 wlo Project PM Peak October 2006 Lane Configurat io ns Ideal plow (yphpl) ~ ,~'--- Lane Width Total LoSil ime (s) ,. ..• "'''''''.-J." .. '-'_ Lane Util. Factor - 'Fi t i~~:~JT:-!7_nf-1'1~~-" ~~(!: ~O :95\f:;k:~ . ~ .g :(dt)<r; '1 .00 ~· o.~~~~~t~1~~i1.91·i~,~· Fit Pro;-eaed '" , "Hio '" 0,95 '1:00" 09'5 ' 1.00 ~ald :-f:low"(prot);, ,'"',, 29'18 ~';;~',f' -;1'I 1 T:"':~12.1 ) 17,1,1" Fit Permitted 1 ,00 0 ,9 5 1,00 0 ,95 1, Sata; FloY/(pe'r.m) " ,', 2948 ~ .• ~, '~171 r~3f\21 ';' .171"1 '" ,15111.Jb* ~_iQl'; Volume (vph) 676 378 484 749 235 137 PeaEnM r'f~c tor , f'HF , '0 ,92 ,....;0 :92;;;f.O,12.d'£Q~~2 ' '0,92 ',0,9~,~~\~~~fr;::;: 'r ' Adj, Flow (vph) 735411526814255149 lfa n'e;91Q'up. Flbw\'1ph) " 11,16" \ 0 !;~.?_26~'i4 'i' ,i;;5 ''; J 49 ~~{~~~~·~t~ Heavy Vehicles (%) 12% 12 % 2% 2% 2% 2% Turn J YPEJ ':,,, "., Protected Ph ases 4 2 PeriniHec{Ph'ases Actuated Green , G (5) E.ffe~h,[C-?re~D: g(s) Actuated glC Ratio ~Iearlmce Time (5) Vehicle Extension (5) La De 'Grp Cap (vph) vis Ratio Prot 27,1 27.1 0 ,35 4,0 3,0 1022 cO ,39 ";'~1i\. .. ::~. J. J ,"f. • _ 24 ,0 55,1 ''/,. ~i' 2" -O~'> ,5--5 11 ',!..'_ '.J;~ £t.~ ~. _~_,; .• 0,31 0,70 4.0;>'.-,4,0 ' L_ 0' 3,0 3,0 5?5~ j; 2410 cO,31 0.24 15,1 ,15.1 0,19 4,0 3,0 33q cO,15 1J!.~!fiaQ9 eerr:rr : . ; j • ,. rtpt~~', ,- vic Ratio 1,12 1,00 0,34 077 qri if()gn::~e!Cly;~g1 i,,', 25,6 ,;, '·.2Z'1~J[i ,(~29.9 i. Progression Fac tor 1,00 1 ,0 0 1,00 1,00 Iri dem.~,-,n,')ar D.i:ilay;'d,2 67,7.,c':" 'i;'39 7 .~i'e,f ,"10.7 ' _ _ __ _ t... ', ... _t.Ja"""".......... ,.,~. Delay (s) 93,3 66,8 4,6 40,6 L ~v~,ofger\ti ce:, ' , .. :,~ .·F D· App ro ach Delay (5) 93.3 29,0 36,5 Aj:Jpr9il S~ LOS t F . D HCM Volume to Capacity ratio : O,~ 9/" 0.50 '. Aclu aJ~d '_Qy,cI~l efigih (5) ,,,.04' '···).'~7:8-:2 '.fi'~~. Sum of lost time(s )";~:;,~ "ri' 12,0, Int ersection Capacity Utilization 86 ,8% ICU Level of Service D c . Criti§~ILane G'roup " " , . ,~·';W·,c';~;;";';;' " •. ' Gary Norr is GARRYSBELL-ST51 -: f' 'Y.1&~ l<~~~ Synchro 5 Report Threadgill et al SE 128th StJ156th Avenue SE -- Volume (vph) 686 378 484 749 241 137 2008 w/Proj ect PM Peak October 2006 Peak'hou'((a€~ol, PH E . r~[ggJr.,-O :92 0.92 ··':9f~.J :92 'i'O~92 :->·.~~·~;~. ':' .... ~~., .... , '-' 'i_o~; Adj . Flow (vph) 746 411 526 814 262 149 lane G r~~Ri E!ow ®~I))."f f1§t :"::;, -:,~ . ~52 ~,.1"'8j(L! ;.?62 ,'. '.l4g ~;'.,ii!;"~jtl Heavy Vehicles (%) 12% 12 % 2% 2% 2% 2% .. ~ Rrot ?,~]M 'i'~:-...,. .1.." Perm -; , .J. • j,;.( .;E.. _ ~. "':co-_ I 3 8 2 p.ermitfe~ p:"has<.-~~ ," . :~~~:, ,~~'; :. :.: ~;\ ::' + .. ~¥,~ .'~;-':ii4 .. ,~. 2 ' . Actuated Green. G (s) 27.1 24.0 55.1 15.2 15.2 Eifective :e,r.een F"g>'(s)IT1\,;~:til f\, -,;.:.i-',C'24 .0~ . ."55 .. 1,1,';:;1'5:2 y 15,2 :. ~:J"c~.~"'!~":."""'""'i"'t,'·~,,· \' •... ~. ''-;'"",--.'~~., w"'" .... ~ ".", ... ",. . .. _ '" ... , .' .. '.~.J\'.~~", :"i"¥~ "'." ~ . Actuated giC Ratio 0.35 0.31 0 .7 0 0.19 0,19 Clear~'nce TimE! (~)". 4-:0 4.0 < 4.0 ..... 4.0 .·, 4',0' Vehicle Extension (s) 3.0 3.0 3,0 3.0 3 .0 La n~ Grg 'Ca'p,{vpH L . ,b1921, 524 2,,'Iq 7 ',4, 332 ,_ 297 . vis Ratio Prot cO.39 cO.31 0 .24 cO.15 Gary Norris GARRYSB ELL ,ST51 Synchro 5 Report Threadgill et al SE 128th SU160th Ave nue SE - Lane 4'1- 8.lgr ,Co ')trol i' "' .'~;*~~t~F r~e;"J~ ",t'" G r ade 0% V olu m e (veh /h ):";,, :",.i!~7il ~'\:';", 14 : Pea k Hour Factor 0.92 0.92 0 .92 Hou 1 )7~ftow r ale (ve1h /h j,fiZ\(;f:It~B.$2~&!' 15, Pedestri ans P3'6i:SY.ld th (!t) , Wal king Sp eed (ft/s) /?e1'ceQl.BJbc ka ge ,", ., "7tw~jfM\lj'~' Ri ght turn fl are (veh) M~.\lLar'iX pe " Med ian storage ve h) v,',C ,confl,ict'ing''v. ohi,me "'603'5i~'" ''"'''. '" " 877 " _ .. _.:, " ... ;"t~i;""'·~~ ~:7'''' u- vC1 , sta g e 1 co nf vo l V:<;:2 ;.slag'e 2 co nf vol tC, sing le (s ) to., 2 'stage (s) tF (5 ) , p iUJ uej Je free % cM ca pacity (vehlh) Volume T ota l iToNme Left Volume Ri g ht csJ.i ,-~ '-~Ll."L •. Vol ume to Capac it y p\!.e Uii'.L~ngth (ft) . Co ntrol De lay (s) Lcane'LOS ' " Approach Del ay (s) App'rd ach LOS " " ....... . . Gary Norri s GARRYSBELL·ST 51 432 446 310 '>'I:'·T,'!,;,,,rO· 9 ," ~ t;.. -~~. o 15 0 ;-, 970 ,:"'''1700 .-766 •• -r .............. ~ ....... ~ -'- 0.00 0 .26 0 .01 , ,~''.O · 0 1 0 ,0 0 ,0 0.4 A 0.2 4 ,1 302 o o ., . -t 7 ,5 6,5 86 14 32 ,,;:.~ .. r 2;~+;~:7,:-"l;' 54 10 2006 Ex isting AM Peak October 2006 ',;'''' . , \ .. " 6 ,9 7.5 6.5 6.9 ", .,. '1, _-~. .. 3,3 3,5 4 ,0 3 ,3 ,'90 . ~ g~ ,-. k'ri 98 . , ,s,'" 99 566 147 119 694 b;-~;. Synchro 5 Report Threadgill et al SE 128th St/160th Avenue SE Ganf? ~ldth _(ffr l~r;/:. :l,r<~~~·:~/ii~~~~;'~·:; Walking Speed (fVs) f>ercent B1Oci<aiei€.' "*~:.~~S"'~'i.l;1i,~-;!''''~~ ;~'!" ... """,':'A ... Jl~. __ ~",i' " ."",_"._~a:::;,,~;;}:!ti&.~,~ ~ .. Ii "' Right turn flare (veh) Meoian 'tfp"'e~';~,;r,"', .; -' -----~ Median stor age veh) -"I' 'Jr" ~ .-_.:>;; • ... .•.• ,. -. \(~;;59!fmctln'g :l(CI,lunw vC 1 , stage 1 conI vol YC2,;5 ta g'e'Zcon t'vol ' IC, Sf;;9le 'i s) -. ' ~ . !9~~:§J~ge(si'·F'1"· , tF (s) , RO q'ueue Iree. 0/0' '"',, eM c ~p a;;;iy (veh i h) Gary Norris GARRYSBELL·ST51 ,.' 2.2 : "r6d ~""· " '~"",Y' 910 - 2008 w/o Project AM Peak October 2006 t '::,11#;, ~., l'icwi ,., "',,~', :~~t~5(!)~>ll'l,EfV,\:\i 49~' 1245~1p 86W1', '3I~ 6,9 3.3 !, 88 , 522 ~,,'-~~~~~:.t . ~.~~~-.r 7 ,5 6 ,5 6,9 " , i:~~~~' ~ 3 .5 4 ,0 3 ,3 '98 ;~~ "i,;{ll! 114 ,92 657 --"fr;-:'. • .. { "'I :-\1:7":', ~ '1 £:i.!.::y.t! Synchro 5 Report Threadgill et al SE 128th SU160lh Avenue SE --t 2008 w/Projecl AM Peak October 2006 Lane Configurations <if> <if> 4> 4> Sign ~on trot ~~1;i ~1:., ~;r~e ee~~~~~lt!Fre.e ~. {A~~t£~~ Stq R,,\:o/· .. -ff~~·itra~ ~~S16R~~~;;,,1 Grade 0% 0% 0% 0% Vo lunlit (v~.n /hI 1?;\-(;~~·89tf. " J~~'~' ,is,,6~1 ,· :' '~Wi~·~~~3 ;~,0 ~}33 ,U; , 2 " • :Ff..#lt"E] Pe ak Hour Factor 0.92 0 .9 2 0 .92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0 .9 2 0.92 Ho:urI Y. (l p'.y!~iTeIve:~7h r;:¥tr~hJ\:, 9.68it}:.W.?,~ ;.?~;~l8J~.9;~\.3?,(,;1l'j!-9l~~.2l~~Y{~\i:r~ft~ Pedestrians ~an ~--:'Wi ",1,'1<11'" "." ~', ,ri~~~~~'~~±,~J~~:,/~t;J.:~j{:~· _ ti(i?;~ il$~~fl-:~p~~~,~,~,~~j Gary Norris GARRYSBE LL ·ST 5 1 Synchro 5 Report Threadgill et al SE 128th Stl160th Avenue SE --t 2006 Existing PM Peak October 2006 !i11}:lveme ot;# II ": 'EMu E~ .EBIitJ;:WB IWt-Ws 'jw wBR 'lI!' B ... r;JBq-;t IilIB , B jiJ '''''q,Bll'.BJ~ Lane Configurations +ft> +ft> 4-4- SI'g' n' 'Co' n"lrol '. -.... -r> ~"" .' '-ree ; , .... :.",");', "'.' ,I, -r'ee ."",.,-. St ' ,~'" "'.{,,., ~/I-' St .. ,-, \ '. r.....%-',;~. r:c ,6-.,~~~= ,1 '~, ~ ----J.:., . op , ... ~~·~.'t ~~":~J,~ ... _ ~ I op ?~ ",<l, Grade 0 % 0% 0% 0 % Vol~rrie(v~h?(1 ) ; ,J.J1;~,~:<768 ': '56"~i~ -9 ~ ~~~~J3" ~. "2"1-;-~ ';'.:'~2 :." . 0."~'12 Peak Hour Faclor 0.92 0 .92 0 .92 0.92 0 .92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 Hou'rly:Q @"W'rate (~eli/Ji)~r:tl1~§'> 835 ,A )61 ;~'9f4'; 2 ,""'}:i;3 £.tji;~f.2.' .,.;;0 "',13 Pedestrians Lane! WidtliffIT!. Walking Speed (ftJs) Percerit?l9.cKag~· '.;;' 4ii!!f, {~! ~ " Right turn flare (veh) Mediaj1 iyrie '" Median storage veh) ~C".~OI:WiSl)ljg .vqJJI!1!''';\ml :f~.; . vC1, stage 1 conI vol VC2 , st~ge~2 'conI vo l"" ·'i';,.; r tC , single (5) 4.1 . . It -r -~';. te., 2.slag,e,(s)." '. io· tF (s) 2.2 pO que~e !et!~ro~-.i~':!A,<i~~ ;~~8 ~.~ cM capacity (veh/h) 677 Volume Total 434 478 Volume ~e!i.~ 1'-: -. ~ .. ,~1 6 -6 " Vo lume Right 0 61 cS H , . ',' , .!' "'!""'f'."" 6'77 : ~1700 • . •• , • .ii,';>;~ .,"~,'{.\.1t>. ',' J ' Volume to Capacity 0.02 0.28 Queue L!Eingih:1ft) .• ""~,.c~2 ~-l, o . Control Delay (5) 0.7 0 .0 Lane lttis-:~"'~¥',1,.~., ~~·'~-'/~~,,-~_'k._:"A1t,~~T . _.~ .• r..~ "r:"'~ __ . ,,,." Approach Del ay (5) 0.3 ApproacH ~o~'-' i." Gary Norris GARRYSBELL-ST51 'J , ,. , .. ~93 . 753 3.5 4 .0 ;~',: ~J;\9E?' 52 3.3 3.5 :. , .. "".- 4 .0 "10,0 50 ' ... ... '" .' 6 .9 '.-;- 3.3 ',,':97, 509 Synchro 5 Report Threadgill et al SE 128th StJ160th Avenue SE +-- Lane I <it. ~fgn Control "'fs~;cE[e fi ,,,' .' Grn~ 0% R~Lu m~(veh/h) >":\ ;b~~jJ(if~8{>S '''':'8 ~3 ~':f [3"" ""';:~':!""''''! Peak Hour Facto r 0.92 0 .92 0.92 0.92 0.92 0.92 0.92 2008 w/o Proj ect PM Peak October 2006 t ~A~ j;l;~.k Jr;r4{~~1B 0.92 0.92 0.92 Bo~:r l !,: flow rilte (vefl!Eil~~B.d il~'8;.~ ;;;98 ,N'J.~,~!J1~lifili~:':lr 28 '\i:;?';-2 "~'~,§d~~~uj\t~9'1i~~1~ Pedestrians ~ati#Width (ft) \-,j\ Walking Speed (IUs) !ieis~nt Blockage ~·~.· Righ t turn flare (veh) •• edian .type ,.; ,"~ce;:ri~'1if,*~" l ," 4... . ... ,,,", ....... ~~_-. ~:. Median sto rage veh) vC ; £onflicting vorurrle~';;1J1e-~·:Q,. , vC1, stage 1 conI vol vC2 ' stage 2 confVol . ·,~"'q;;:c}~:;; "; •. , '-~"';' ;.1' . t '.; ..•. ". ..,~, t ' .h .... -!" \1:.~J:-.~.. .. _- tC, single (s) 4.1 6.5 6 .9 7.5 6.5 6.9 ~~~ 2' stage (5) .,,~. ;f~~t-4;j1~-'-~~ ~ '.; ":"':': 1·~~;~·!t·~-¥:·· ,-' ...... io~f>!::fZ tF (s) 2.2 4.0 3 .3 3.5 4 .0 3.3 PQ 7queue free % ""'"·;,':E~-9'l;.c_,:'.'.'4i'f,~,~:j,, ': ' ·~_92 l-"'.""1'J!II'~~~1i'i.·~ .. :.f#J: •. 46 ,,,-.,.:94 '. y 9. 3 .. ,'~} ." 95 " :~;lon ~,·,,"97: • ~ • ._ 1.' 't. ·.X;::j'Lit."""-_"t'""-,,·~ -~ . ~ .. ," ,:.-. ~ft:z:t;llii:tr:"li;;.T'!"~·"L:'>·$ _'.. .. .",:., .';"i. '... ;"1:~""'" ,.,\~:~ . "- cM capacity (veh/h) 606 684 52 35 514 41 34 463 488 538 Volume Total V.olume Left Volume Right . J' ~'~;J~~l' ~. ' {~~.~O ~ cSH .' ,. Volume to Cap acity t)uEju.!J Length .1ft). Control De lay (s) La ne"LeS , ' -- Gary Norris GARRYSBELL·ST51 o 68 ·~t §C!.6 ~~ 7QO ' 0 .03 0 .32 628 574 66 16 58 ~. 01'=,'~8..i t ~~1 ' o 4 36 14 61}4,.1!.96 - 0.08 0 .34 . ..• . -.-.",-" ~"E 1 = " 7 .!..:.s.0 ;1'-·.84 .. >~;~;U?~-.~·.}, 2.2 0 .0 96.6 25.3 A . 1.2 , ... ' .. Synchro 5 Report Threadgill et al SE 128th St/160th Avenue SE - ~!r~.Iin liP ~ .. _. :, 1;'~', ._' ,!,~t ~>r ~W'~~""~ Median storage veh) - 2008 w/Project PM Peak October 2006 [<{f.f"2rill!£li ng :>(~I ~U\e :;< )j:l]iJ:'t~'~4'>-m!l..(l~i;1,p .l ·7~¥f-:;~-F'<'l\~i{';~\~~~2 "·:?2~~~§.~~:~~ 1.13234:n~:~E~;M.6 vCl, stage 1 conf vo l ~C 2, sl~~.f~.corif.vol tt;{~'i~~l'~~1: ~,_~~'li';',: tC , single (s) 4.1 4 .1 7 .5 6.5 .tC,_2 .st{l ge (S) ,", 6.9 , 'j 'c;."--'\ ~-~j 'l"t '4 " ,,' 7 .5 6 _5 6 .9 If • :"," ,- tF (s) 2.2 3.5 3.3 3.5 4 .0 3.3 ~PQ:·q· _ .. lie~lJ.¢. Zf.re_· e %.< . "'.~ ~t:1AjFgr "+~~ :. ~"'~:'S.D..·~{.:~:t·90-:t~, ~-''\{$(;; ~~:;f:~~ 4G~ .' iV 94 J:: ~,:r:92 ·r, .:, 94 ~.. 1 OO·~~:~0 9] ___ •.• ~~.' -.•• ,i..1ll:..? ..... j 'I:..>';';'}" ~'40 -!iw..r:lr,H"'",.,).~_~ . .a .~ I",f "J..~,k'< ....... /~ ~ ~. ~ , ......... -,._ ,,~"'., ~~ ""--.{.(~.' .-... ~.~ cM capaci ty (veh /h) 606 678 49 34 510 38 32 463 Gary Norris GARRYSBELL -ST51 Synchro 5 Report Threadgi ll et a l SE 128th St/160th Ave nu e SE Lane Configurat ion s 4'1> - 2008 w/Project PM Peak w/s ignal October 2006 t 4'1> 4-4- Id!lii Flow (vphpl f :"., -1%09 ") 990 . 1900 , 1'9"96 ;l\l.00 ':f90q /19QO ,::':,.-1900_: 1900 ::,1.9'g.o 1900 ,,;)960. Total Lost time (s) 4.0 Lane Util. Fa.£!or 1<·~~.:,t.;0 :95 Frt 0.99 FIt'Protected ,I, ;\."" ~'&~~~1 ,ob :-'. u,,\o!iH. ~~';1;;,"~ ., Sa t d. Flow (prot) 3496 Flf Perrhitted 'J., il~~lfl~~' 6.93' ~' " Satd, Flow (perm) 3250 Vol~me (vph >1':!.,.t~".!a'd Z'j¥iJl_63 ; Pe a k-hour fac tor, PHF 0 ,92 0.92 Adj, Fiow (vph)'. i$ .. ~,--'~ 1S'1" 938 , Lane Group Flow (vph) 0 103 5 Turn T ype' ,;I"" Pr otected Ph ases Perm itted Phases . '4;;;':"::~ Actuated Green, G (s) 21 ,6 Effective Greeii .,g (s r "F'1,;:-iiJ:, 21.6 Actuated glC Ratio 0.59 ~I\'laran ce Tim !l]~J~Y r~:-4,,0 ' Vehicle Extension (s) 3.0 Lane Grp Cap (velJ).wY,,1l 1929 vis Ratio Prot I R 'p " . ..,.. ~I''''-~ ~ 032 v s atlo erm .... _, r'k '1;~~':. . vic Ratio 0.54 Uniform Delay. ~~ 'Y Progressi on Facto r 1.00 Increm e~!a l De IRY' ~2~fl' ',:',0,3 ', Delay (s) 4.7 L~velof A Approach Approach IP!:i;;t~~ll . . HCM Volume to Capacity ratio Ai:tua,!~d <;;Ycll,'l,l:!'¥Qgffisj ~'l1;. Intersection Capacity Utilization c ~·cr.iticil L ~ne,QLqup~~ • Gary No rris GARRYSBE LL -ST51 7~ 0 ,92 -.'79 o !~s 6 1 0 ,9 2 '66 o . , ........ 4 ,0 4,0 180f '~. cO AD 0 ,67 ,.; 5.0~: ~~;-~ . .}- 1.00 Q5fur:,Y 6,0 6,8 , 6 ,8 0.19 l' • 6 4,0 rOO '" 0 ,88 0,99 ' 1633 , '0,96 1581 0.9 2 -, i4 16 0 6 6.8 6,8 0.19 4,0 "'I. 3,0 295 0,01 0 ,05 12.2 1.00 0.1 12.2 B 12 .2 B Synchro 5 Report Threadgill et al SE 128th Stl169th Avenue SE Lane Configurations R/!tn (f;o'!trRi:"' -:, Grade lV~lJlne (~~/t;i)··~;~, • Peak Hour Factor lJqu [Iy'f.\o ~r a_te" (v'e h/h) Pedestrian s M ne"Wfdili' (ttl ,,' , Walking Speed (ft /s) Rercen CSlbckage ' Right~t"'ur""n Sfi~r ~ (~';h) Median,'typ' e ',4J?;,";'" • ..J . '" Med ian storage veh) ye-cqn fiLctfng'":volur'r(e . vC 1, stage 1 conf vol v02, stage i !i;onr Vo l tC , single (s)' , tC '2 stage '(sf " tF '(S) _. ffO"lfeup fre~;% . cM capacity (veh/h) - 122 o o - 408 204 .· ........ 0 -9'" 0 I, -"'; • .'11: _..... _ o 0 364 16 .. :J ~~-: ·1.?tttt~· ~~_~~"'? 6.9 f ~,~i&fi~"<l-' -~ -,~- 15 2006 Existing AM Peak October 2006 ". ", -.. ." J~A Gary Norri s Synchro 5 Report GARRYSSELL,ST51 Threadgill et al SE 128th StJ169th Avenue SE I Volume Tot al \?,olum!LLeft. 'P' Volu me Right cSH -" .,~ ,,~!..<... "" ~ Volume to Capacity - 75 138 ~iJ~e le,!!gtfi'Wt .', ,:: .,:t!:r:;;fl.Q ~ Control Delay (5) 0.8 0 .0 l-a riEf'L.:OS ~.:.,: ~>'>;~?{\. - 459 Approach Delay (5) 0.3 0.0 jfp,p' ·acli .la,o~.:5!;· r? . .;;.ftl:i[>$]ll7~~Zi!i :;';' Gary Norris GARRYSBELL·ST51 6.8 3.5 2008 w/o Project AM Peak October 2006 1 ~O,·:}~.~:9Z :i~'*~~?'$~~~~~: 3 18 652 18 1 17 614 0 .03 ,2 11 .0 ,e 11 .0 " ;i", . :7: • ;;. i .' 1:;~~~~~!1F;' \""" .. ~ .'~ 1"""~~~'":TIr "j B:~.-£ ~~~i&i~~~~.~,' {f~._ '~:7'~, '\' }i.<<\,§:~~..;#""J.;:~j Synchro 5 Report T h readgi ll et a l S E 128th Stl169th Avenue SE - Lane Configurations Sign:C'qntro}". " ,;~;;~' ''.\.'.,,, .. Free _""""~ '_L Grade 0% Vo l u ~'e,('{il@1 ) '\wr~·::t :ii 192 Peak Hour Factor 0.92 0.92 H ou"IY~no\<[,r~te 1'di~/~);r~{;7,.;:'/'·2Q9 Pedestrians Walking Percenf $1 ~ii:,~~~~~ll2i~':?;"'" Right turn flare (veh) Media~' !YRe '''' .~ Median storage veh) vC,'conflfctihg vQl u me~i!'.'El89 - vC1, stage 1 conf vo l v~2. stag.e _2 So~n-f~vQ ~::r~~Fj.~~ .. tC, si ngl e (s) 4.1 tC , 2,s'tage '(s)li.... f",.¥,."J"J./' tF (s) 2 .2 pO ' qi.(e y'~,f!ee -'~JE;,99 , cM capacity (veh/h) 901 Volume Total 76 Volume Le ft .~'e. ',. '~, 'i:~ 7 Volume Right 0 . S'H. ," "Y;'::"illi"" .'~ .r,···.,-9·0 1 C . " '. :~'. ,,1'} ,. Volume to Capacity 0 ,0 1 Queu'e; L.en'gtti;; fi t '-:",', ' " ,1 Control Del ay (s) 0 .8 Lane [OS.: -~" i! :~~:l~\..-~ ;'-.-.; ,A . Approach Delay (s) 0.3 Appr~ai:fi\c;JS' '~;;r~1' i;;< Gary Norris GARRYSB EL L·S T 5 1 139 0 0 1700 0 .08 0 0.0 ~-. - 459 230 18 0 ' . '0 , 1 0 0 17 miD 1790 . 6 1 3 r:,~ , , 0 .2 7 0.14 0 .03 0 '" ~ 2 0 .0 0 .0 11,1 B " 0 .0 11 .1 i:·~,,~l!': 1~'" ~i:;' ..'," . ~~ 2008 w/Project AM Peak October 2006 -~~,.,.. . . , .. -J.r • t. ;, Synchro 5 Repor t Threadgill et al SE 128th Stl169th Avenue SE Gary Norris GARRYSBELL-ST51 -+ <4- 270 135 .0 0 o 0 1700 ~ 1700 0 .16 0 .08 -0 0 .0 2006 Existing PM Peak October 2006 -. Synchro 5 Report Threadgill et al SE 128th SU169th Avenue SE vC 1, stage 1 conf vo l l'C2 ;-stage 2 conf vol _ tC, single (s) -- to,'2 stage (5) .• , :·,;.::'.di~~,:.;U~'f'lr; ,', tF (5) 2.2 ~b q)jeue free :'l';)1iii~'~>Lf?"!~;l5,;:r0~:.' cM capacity (veh/h) 1101 6.8 ~, .' . t~~"';~~~;·D~: . 3.5 3.3 . ~'::.190 287 Volume Total 304 153 Y olume Left '.~." . ' .. ,.,."" '\., Gary Norris GARRYSBELL-ST51 2008 w/o Project PM Peak October 2006 Synchro 5 Report Threadgill et al SE 128th Stl169th Avenue SE Grade Gary Norris GARRYSBELL-ST51 - 0% - 0% 0% , ,.; ;]:.' J c'''''''''' 2008 w/Project PM Peak October 2006 Synchro 5 Report Threadgill et al SE 136th St/156th Avenue SE -- Lane Configurations 4- ~llll) Cqnt.r61 ' 'oi".,{~~~'i'~ .... Stop·,:,:4 :'<;;~ .. ,,'. f; , stage I vG2~ stag_~ 2k'on t~~· .... N"~~~,~r,:,~ tC , single (s) 7.1 6 .5 le, 2°'stage (~) \0 ,~: .';@ .. , ·:~~f~·:'~ "',. .,-. '":.', ';!:'~;' :~Y·t.l1~«: ~1~~~~; ,-'Ii tF (s) 3.5 4 .0 3.3 3.5 4.0 3.3 2.2 pO queu~fi,!!~'·%~m~1 ~,g ;99 ,", flY •• ~7 ~f\l9lS--1'f,9§;;~~1~QO: ~<:, cM capacity (veh/h) 120 144 732 115 145 279 1249 ~" : .. ~''.( ~t" ' ~.',-'ii;:;,~'7v ~-~l,{ ume . ume Left o 4 t ~<?lum~Rfgh~!r~ Q .7ift 2 Qi;.t~: '~O .. cSH 252 115 1I,0luTe to 'C ~acijf'fI:iil)(n ~~~j O,03 ·"J·1 ,'":~.~:':b ·~;M :1l ~ ::Jr~!-:~~o ~~;,} 279 1249 1700 664 1700 1700 0.q2 :;~! 0 :00 O.6J · ·();C!~·:'0.18 ":0.00 Queue Length 11 2 c-cm trol ,Delay ,'37.1' i.·ane LOS --C E ApP\oach .,Q~i~l·@:P~?L~\.2f·5;:~ . Approach LOS C C Gary Norris GARRYSBELL-ST51 2 0 0 1 0 0 18.2 . C 2006 Existing AM Peak October 2006 ;. -: '\".U" 2 .2 '1;; .• ' Synchro 5 Report Threadgill et al SE 136th Stl156th Avenue SE -l - 2008 w/o Project AM Peak October 2006 t Lane Configurations r. ,Si gJJ.Gorit ~ol "" -}~l'~'R Free Grade 0 % 0% il o lu ITl~ tvEiQ/h) -.932 . j ' "." . 3 ;1:g1~l~~Ji.~~ Peak Hour Factor 0.92 0 .9 2 0.92 0.88 0.88 0.88 0 .8 0 0 .8 0 0.80 0.61 0 .61 0.61 tJp.uI!YdIoy;. rate (veAfh)?:~1-~1m!. 1';it~-22 ;-i!ij .. (~~LM~~8l'~;J:.,4;',·'.U 65: '. :;\:.1~i:£i~iI!'f:R~; .3'4'~),l':':;.ii;t;3. Pedestrians fl1n~'~idth (ft), ~ ~~ -.:t~~;,~11~~~i~f(~~~~?~_~~·. .~~ ~ ';2~~t~tt "" Walking Speed (IVs) E'~w.1Bjockage . :,' Right turn flare (ve h) MedIan t ype :' .1'> ~. ,,~ 1-l:~~None~: ~ ':{.e~ . ". ?~,;n; . .JO!le :"' ... ~~, ~7f./ft.~~~-~·.'ii '-' ,....J.. ~ -C:. _ _ !f ,,'~_.A.. '..c.... .->. U:!; ~. ",il C$·~~I . ... .... _.~f'" 'b_ ... ·• Median storage veh) ~.~kqh1J i4ting ·"olume /~;:-~?1,6.. vCl, stage 1 conf vo l ~~21'ill.~@e '2confvol tC, si ngle (5) fef 2's tage (5) IFf;;) . p.lLqy.~ue_ free °/p _ • cM capacity (vehfh) ~f A~t. :* ;c.~H~..;-. ~qI~.!D e;\to·.¢apacity Queue Leng th (It) ~]IjIwi. Qelay (s) Lane LOS 'A ro~ch Iile[ay-(sr· ,-' Approach LOS Average Delay ill ier~~'!:!(&n Capacity Wil~1l!l.;;ii1 Gary Norris GARRYSBELL·ST51 .. -.~,*" 2.2 593 ." Synchro 5 Report Thre a dgill et al SE 136th SU1 56 th Ave nue SE --- 2008 w/Proje ct AM Peak October 2006 Lane Configurations 4> l> 'i l> 'i t 7' S~ig rf-:Co'~tror J0M~:t; 'i~S -~:(:'St9P~~m( '~'~!' '" ~ St9P ,-" ~~~c~~:t~~:~(t~~Fr.~e ;.~., .. ,~v~ ;-/', :.: "'~A _~freEiJ:~~f~ Grade 0% 0% 0% 0% V I -'-to h-7HC")"~' '-'1 1'-"'~~-=iiJ 2-0 "3'~" "0'" 1 5'-"'-C:"'-3~1'-93'2 "'~ 10 "" '3 ""'21 """"" 2' o':JrlJ e '.(.e ,~-~._;;: ,", f; ,:t·-'t ._~~1.t:. .. .'~!~.,5"; •. : .. u" ,-! __ ~"'.';-~:,;~.:.c :::~;-.:.. ~:~i.: _ ':'~!: J.:r ..... ,,~~I h;;r;,$"'~""_ .. ~ Peak Hour Factor 0,92 0.92 0.92 0,88 0,88 0.88 0.80 0 ,80 0,80 0,61 0.6 1 0,61 Ho UflY.l li ;f r9f{(.v,~fi!h),r,'·-'Y+',:J 2:v~~~i:l.\&2 >lld·.3 "}~.,1~ O';"!'ry, ;ft~~;tW{j1Ei!) 1,)5 ~,>il'-12 .. i"; 5:~'!f3illi~~ Pedestri ans La ne~W !,ait\ Jf!):!~:!t~;!,{, Walking Speed (ft /s) ~:eLGfriI BloGk.age lffi",.~.4i'. >{~:~'~\;j:!;~r"~ Right turn f lare (ve h) Med f~n , typ.e ~. ~"",,,,,_:;,,,"':,,,;. :N o,il~e,,'· .. , .... :n.i'_ Median stor age ve h) vC,J:o nfMtirig volu ,rili vC 1, stage 1 conI vol vt2 /stag~ ?;cC!I1 f ,vol;' . '" :,' '1, , tC. single (s) tt 251ag' e -(5':"'" :r':i!;'" , t . .~ ~ ,..'J 0;. ~_ ~ •. {, tF (s) pO ~ujue,fre>e: 0-l>:r;£ cM capacity (veh/h) ~"r' ."'" --~. Volume Left Volume Right '!i;-,~_ " cS H Volume to~Cap:a cifY • Queue Length (It) ContiOlbefa)', (~t };,ii;j ~,. Lane LO S APpro,actJf~~~¥l~)·'\:· Approach LOS Average Delay 7,1 1557~1538 . 1171';"'349 ,,' -. -, .... -.:". .~ , i n ters~gi§h ~<f.i:i:~?i:iti7;!ltil!zati6h '~:1~7.?!f~lll~i;:' :leU l ,e,vel of:Se fiii2~'"6illM;},,:~) Co ; ''..' i:1<ht:~~~~ Gary Norri s GARRYSB ELL -S T5 1 Synchro 5 Report Threadgill et al SE 136 th St/156th Av e nu e SE - Lane Config ur a tions 4- Sign Control ' !':, .;t: ;;;~WJ\l~ Stop Grade 0 % Volu!p}J-2N~h'lh )' >~' • ',. • g~ ~'; 1 Peak Hour Factor 0.92 0.92 H(iu[ly fi pw rate:' ye!1/hT~i;~l~1:nf/ 1, Pedestrians " ~ •.. ~;:c l ~ .. ~..... '.r~$?""">~: .~ Lane Width (It)" ~ .", ~i'-~, &,' Walking Speed (rus) P E!!ce.£l f Block§g~",vn~ Righ t turn Ilare (veh) Median type 'C :-~.{'>~ ":~,,; ~.N'one Median storage veh) yC ;·ci>nfli 1;liiighv,Q I u.~,r&f~1l'18 i'l9 ' 1346 ,,~: t,1 '~1~6}"; vC 1, stage 1 coni vol v~2, slage tconfvo l ;;"~l'~·j~'. tC, s ing le (s) 7 .1 6 .5 tC , 21ltage .(s f . tF (s) 4.0 P'O queue·free ·:% 'r·' '_~;r74"')~:·98 .. _ . ....... " .. -,,"",... - cM capacity (veh/h ) 51 66 t¥;" $' .~~' no -,~p ~ , \ '1" ~ ........ f!$f ~;. Vo lum ,e 6 6 .• -'. 0 cS H 44 vOlurne]oCii~~~i ti:"-:Elll3E&!,O .. 13 Que ue Length (ft) 39 10 Coni[QI ;QeJay,Is)' ,', .:'&I;~FI 99,7 . La ne LOS F F Ap p'rdach l!el?iJs~ 6 t 5 ' '52.1 Approach LOS F F Gary Norris GAR RYSBELL,ST51 -t :," 0 % 2006 Ex isting PM Peak October 2006 13 .. 341 g'15 ·7',.,20 ' '~.J ~""~""-~=--~"-' !. .Free . 0 % 821 0 .6 1 13 46 4 0.61 7 0.80 0.80 0 .80 0.61 16 '~F42?~~1 gt'lir:3q . . ;-'---~"'.; :. _, i~ 3.3 2.2 \K§J' !1 9' ,; 97 ",' 621 509 4 .1 •• ~ H'~:rn -" , ',,,,.' 97 . ""~ hlzs:df1 ._. 1115 o -. ., - Synchro 5 Report Threadgill et al SE 136th SU156th Avenue SE 2008 w/o Project PM Peak October 2006 Wollihl'E7 Righf~~1:r~~~!::tf;J?i5,4J~,('~tFo ~fi~ti'(~:~ -~ti!Oll~~'i7'\2 t:tWt~le'~~~~o~~$~?7.?.i ~T/<:-;;~~~~~T!~~\~;~~~'~)_i~,~~V;~-y;:;~-'\,' Ii~_,,,, ... ,.£.....,_" ... , ~~,~..-.&'_,~_ .•. ~lM,'·;; .~,;",.. ... ,_ .. _j.!l" ..... "-".~~."" ;;.,...>,."'£i:,-<,..,~,,,,_ .. =·"';'~)"'~"""'-'d\it~:'';:/_.,-",, "J'<".:J1l .. ,', >, .. :;;.: ' •• ~ _ ., ..... ,~ -:.i1rfi\--. h' ~·dh'·i-··~':. ~H 65 28 2~ 439 1M 1004 1M 1700 ~~o:r.n~e1)9l:9~~Q~%'~I~:'s~j~Xg~JE~I;o.~"§:~§o ~o!t;{~y~. (j ~Q~~~t~gg~!t: @~~1~~!~r ~:r:Q~;~;,n~~flri~{~}fi1:l~. ~:*~~~?;::' fi Queue Length (It) 63 19 3 3 0 3 0 0 ~c[Qt~qrtBl~1?y{(~},~~1K~~:i{;12~2~~1 1Z ~~,.p.i~i,~~!l~~/~.B)~~~l>:lt}1l~[~r,~Q;Q~b_:Q ;~;i~-;~·'·"$;~~~1~~:{g~1t~t~1t~ii~l·/n Lane LOS F FeB A 'iP",.,-, "",.,,,,,-~ W("''jj '~ < '2-2-4'<'"' 8'6 2" F"" F··~"O· '5' '''''i'i;mt''';~O-2'1r~~'''_i:'''''' " "" ",'; "'~-ji""~' \ ~" ~~ar;g~2!l:~~..!e.~~:~),.4G~·&!:. ::L~2:~L4, .. :: .. 2.'fl~fr~T:~'iJ:¥:.:";,,,~~+6iS~.£~~~VfJi?i1iit~:$:~.~5 .. .;.,-~iJ~'al:~~~),~:~1!~r~;'*Z7/l\:;:t:'e Approach LOS F F tller§.eeqll!ll SI!J[l'l!J:la Average De lay 3.2 I nle~S'e etfo"h C~p' i3 Gj t;; ·Utjliza,,·tfon .~~.t~~.cl}\!'8,lt6'%~;':f1~.·ICIJ {ey~i;o!iS:e'rviCe. 'l'lE!Ii}\,i!T~, .• "'fPf~.isl'p !ill:1'JlI'll' .• ;~,·"·'i4";". ";'li,?"".c,' . • ... -".n_.,~,-,. .l.< .. ~ ."" .• _., J~_\f . ,. ..~ ~_ • ,>?--. , •• ,.,,;:. ~ .. _ ... ".~_,;~i~l. ........ 1.~~~ _ ~ ...... , _~~".",,*'<-,","f" ... ,-.; .Yo., J: ~" .. -,:;.ti·;!'p._··';.;.t!'?·~,· ____ .•.. ';.~; Gary Norris GARRYSBELL·ST51 Synchro 5 Report Threadgill et al SE 136th Stl156th Avenue SE Lane Configurations Sign -Control , Grade )j\l!u ri'\ItJ ve~1h) ',. Pe ak Hour Fa ctor H9PJ.I£Q2~ "ite(yeh/h'j Pedestrians --t 2008 w/Project PM Peak October 2006 !{a(i~.Width (tt) ~ ~j ·'~:·;?:1?"l~~~t!M~~~~~.~,t~~'1·;,~'t,,~~:(,-%~~~~~r~i };~~.\~ Walking Speed (ft/s) PerGEii1i:Slockag e .~.-~. ---. Right turn flare (veh) rviediai'nyme " ';.i~;:Tr'No rie' 'i. ,~L,';.7~~J!'f' Nim e*t' "4?i~~~'~ d' -"'''' '.J"' ....... ·~,s,<-,,-, ,~ .• , ".L ~.'!._,:: I~~'''''-,.%~ .. ~. ~:l'ali';~~;!','_ ~ _ Median storage veh} y G,,,!&m!l~Urig volume', vC 1, stage 1 conf vol "C-2 's"ta'g"e 2 conf vol ';" .;r~~..,z_? ,.; .. ~'':':j -\..-;,;f:'~'" ;,.',"l.it' .. , ;~r:1"" ~11C~i??"..Jf:i~;;': IY,c. " ___ . _. h:2~:-:-:~~.:itX'.~I:·,:...':.';·1e,:!« . .:.,.:.:."~~,;,"'?·:.u ,.'i:-:: ~4t;;~.:r .. H!· tC, single (s) 7.1 6,5 6 .2 7.1 6 .5 6.2 4.1 t~,l _stage (s) tF (s) no q~ueuir.fi'ee,% r-:. ...... ~ cM capacity (veh/h) ',. .~.:~ , Gary Norris GARRYSBELL,ST51 Synchro 5 Report Threadgill et al SE 136th Stl156th Avenue SE Lane Configurations 1 <;I~ijrRbw (vp hpl) T~ta l L~st time (s) L ~ii~tiL@~tor " . Frt 1=i!:r3i.\lI~}l@9 't l.',~~";'~· .' Satd. Flow Pr o.tecte d Phases Perr'rt itte'{fPhases t -.. Act uated Green, G (s) Eff!iPEve ~-ren,Jj '(s) . Actuated glC Ra t io :,-, -- 7 16 _w'j b~:· 8 ;~-·.- 12.4 12.4 12.4' '12.4 0.03 0.03 2008 w /Proj ec t PM Peak (with signal) October 2006 t .2', 465.7 465.7 .·'·.~~~5~ {q5.7 .i, 0 .96 0 .9 6 -~-:;I 6 '"W, ' "U~~6 -=-1-1. ':'~." .~i.. ,,~ ... 465.7 465.7 465.7 .' 465J~' 4:?r7,..i62.'q 0.96 0 .9 6 0.96 C[e1112!lcu liue(s) . ,,' ~', .;:il\,)'?'i[4:'()j!~ cI·O .' Vehicle Extens ion (s) Lim~·.f'[p <?ap (vph) vis Ratio Prot t1CM:JI;ver£9.!'l <;;'.oQtrol..p~la.J',~ ';'" , 14'5 HCM Volume to Capacity ratio 0.85 ifd~@~~!tl ~~n.gtli~(s ll~ill . Intersection Capacity Utilization !e.S1.fi is~·Lalie §·~oi.iP.'·""j:Il ;~, 'c,; Gary Norris GARRYSBELL,ST51 3 .0 41 0.01 ",' : ';JS:~?'5?, .r.i 1773 . 0 .27 850 1785 ,15 ,1'11 • • ... ,;I> -"",:;,...~ cO.8 1 0 .04 _ Mo 0.04 0 .85 0.00 {..2'" ;,,0.4:= '(2-:3'>" O.~ 1.0 0 1.00 1.00 Synchro 5 Report Threadgill et a l SE 136th SU160th Avenue SE -- Lane Configurations .;. slgn .GontJol ~ ' .. ~~.' ,.r:~:,'-rsf·"o·"'p·-'" .... ..is-___ --..,.!".t;;; i'" .~ .t.. A'_, Gm~ 0% V§)J!.. e (l!!,h /~) '< : ',,' ~):$.I"flr:~"""'·-'1"~-·<;~·""). ! ~ 4., Peak Hour Factor 0,92 0 ,92 0 .9 2 0.92 0 .92 ~~·-"-~:fi ~~"":"71.~n-T ., • --,,;:" "~:(!"{?X+:Wi:-;;t.\l1II,Ie:~~='f: •. '~ t;f!:1lli,)1i(lg~ ra!e:(yeli/h )"";''''1~":;'~!i\\,,,3_1'''*! ~';1!!i1J3 ~~.:" '4 Pedestrians J:aft.~J.g1 .. n (ft)' ,if ,'.' W alking Speed (ftls) Pe(~ep.t§lo C;k.2gE< •••. ,'. :.w.·,~~t;~!,~;~~·"')~ Right turn flare (veh) M ~'Hl~l'!:TYe e~;\i ,"f~ '. l' ~~t):.<~:: ... 2~.No~e Median storage veh) vC'&C§riJ!if<~rg-Voi~me t:' ••... vC 1 , stage 1 conf vol v.C~i~t,ifge _2}~orif vol ,,, tC, single (s) te , 2 SlaJje: (S) , tF (s) pOil~E~!lefr!ie ~L C' . " cM capac ity (veh/h) "t,t;. .!:1 ~ !r:~~"[ yof~nI~f[.~G,~Ra§ity;i ~, Queue Len gth (tt) ¢.' dirtr rBe-a' f~\ ', .. , • .:.t:.. =...:: ~ I ..... J,... • Lane LOS ,e.;pi'!c~acp ~DE[faY .< s) ,":~ Approach LOS Gary Norris GARRYSBE LL ·ST 51 7 ,1 -.~ None 6.2 3.3 ,9 9 :;:-;;::-;'99 " -, """"';,;/7"",'t'_ .- 1015 1555 2006 Ex isting AM Peak October 2006 2.2 Synchro 5 Report Threadgill et al SE 136th StJ160th Ave nue SE Lane Configurations Si!inCggtro l ''I'. .1<, Grade ljol u.rn~JveFifb )' '~~T:. 3 , Peak Hour Factor 0.92 H6ur[x,flffitWlej~<iliI.I)L~If~3 Pedestrians tC , single (s) 7 .1 tt ;.2 ~i~ge (s)'.. '0' tF (s) 3.5 pOqi;Je_~e~. ,.S~l(",100 , c M capacity (veh/h) 796 M/1f~"'-;C'i~~'. <':1 .~=,lii<.'\.o' . Vo lume Vol~ru'e)~igjlt cS H 915 Average Delay Inter~e~t)qj:i'£}I]acliy_ Utili za tion Gary Norris GAR RYSBELL -ST51 4.0 4 ,0 1 O~t ,J,,;.li99';;'~1::0Q,}. ..: 9§l 742 101 3 791 739 17 3 10 882 0.02 2 9.2 A ,9.2 A }~: >.Q ,o Hl"1:;o.QP ;'i'j·,~· .,. ~, ~~L.:.J! " .. ,!t",~_ jl" 1 0 j"·>f;1~5~:~ (f ~ ~ " __ .,~ .. , '~-'.i._'" .;j A,"""""""""", 2008 w/o Project AM Peak October 2006 .j. ~ree .:.:-·) ~~ 0 % ',' 0 ,47~.T~ ~.? 0,92 0.92 5r ~~~,1i 2.2 ,,100 1544 . ''''~''''' , . ", "r><-'~ Synchro 5 Report Threadgill et al SE 136th Stl160th Avenue SE --t 2008 w/Projeci AM Peak October 2006 Grade 0% 0% 0 % ~91y~~J(~(~1?1~~il~_~~g)~~V~~~~~j:~};~~:;'J~{tr?~~3'~~r2iilI4~{~~;;[~~1·'o~~\5~jf~~~i4.i~~5 ~lt~~~;~~~:[~ Peak Hour Factor 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 0.92 Average De lay 4.2 !11!!f.~tiQr(~9.~R?_sT"~~gftTi~f.!§rr~~~t.l:~f:,JP :~~!.6~;~~~~~~!1!~~~0 -~~tYi~e':~:::~H~i;'·0{/$,n~f~~~{¥£~~~¥;~~\~;~~¥?J Gary Norris GARRYSBELL-ST51 Synchro 5 Report Threadgill et al SE 136th St/160th Avenue SE i vC1 , stage 1 conf vol II CZ : sta'ge 2"cori(vol . tC , sing le (s) te, 2 s iage (s )" tF (s) plfqueuafre.~ 0(0 ,;' cM capacity (veh /h) ..,., "," ~: ,;-:. ~:./ - Average Delay 2.0 3.5 _ .100 ' 841 - . ( 4 .0 10P 778 ?;l ·;,~.F -"""-",,,."'''' 3.3 2.2 " 1"00-'''''1''0'0'' . . I. :r~'..c ~ .~~<""" 1048 1528 I ~!lir~'iic.ljp ij' Cal?acity Lltii1ZatT§bb~~m;('lf?>'Yi :'\!,-,'1";" I ({Q'~k~'[i 9LS.i!y it;lif f!(t , .. Gary Norris GARRYSBELL·ST51 2006 Existing PM Peak October 2006 Synchro 5 Report Threadgill et al SE 136th SU160th Avenue SE - -, , 87 Volume Left 4 1 0 7 Yolu.(1l e, Riijhl-i1£ :' :<·~~1~~:j.i ()?:·. ,_"O ~;' !l cS H gOO 777 1517 1582 1Jg1u!J1!"Jo l;§'p~City ,';:,y q:O,?';!~'9 1 'iA9 0 "; :0,00 ; Queue Length (ft) 2 0 0 0 c1in t(ofOe1ilHs} ,:.');10"ti:gll ,,;;C~ g,t '0,0 ' !i·i),6 ' ~ a~ ... L-..>OL. •• ~ •• ' .;;.K_"$~..:-dJI:), • __ ._~. """'-,.", Lane LOS A A A Appr~~~hge l ;iy' (s) (-<:,.·g;:~-9 J' ""q.O~l:F~, Approach LOS A A Average Delay 2,0 - , , , 2008 w /o Project PM Peak October 2006 t 1r1,@o~(clJjO[i ~<!p?C ity UtjJ i ~lip,fu~' ::f¥f13 .8%Y'!r,t,;';ICU' L'~y~1 o¥j ·P~i;v.jci.l :;·{0iJ.iit.ilJ1t.{f::,~l\;Y£ '~;,,)~'~)~!4'~;r~ Gary Norris GARRYSBELL-ST51 Synchro 5 Report Threadgi ll et al SE 136th St/160th A ve nu e SE Lane Configurations Sign Contrdl ''':' _' 4- :,!~.~~l'.',. Sto'p' ~J' ~ .. ~ ,.~... • Grade 0 % VOI4me'(ve h/H)" i!lJ!~"';I;>:~,o-4' , Peak Hour Factor 0.92 0.92 H?u(lyfioj\i:1;a,telv e>.ili ~4,\~: 4 Pedestrians Lan!!, WidtH '(ft)I~t.~J!fJ;~,: '. Wa lking Speed (IUs) P ~rc ent -BfQ.c~$l ~ ~l:7f"~, Right turn flare ~!ldian . Median storage veh) ;,;G. C9~fJ.lct[ig yofWne vC 1. stage 1 conf vol \;C2 : slage 2 .ffi.n-r.f ~vo"'I~"". ,-,,.. tC, single (s) 6.5 t¢Astage '(sr ~ g~'.'~:1':' ;'C" ;' tF (s) 3.5 4.0 pO q'ueue 'free 0/0" :jFC: ;.:t'!).:I,f'gg 5-IT''. 99 '" . ~ .... • . ..i:~,1i.'"'~&i .......... "'" .. '!it • c M capac it y (veh/h) 760 693 ~ . . ~!.~~:-;¥ 7.7 6.2 3.3 99 984 iJ..QIu,l!Ie cSH [olume:to CaRal:itY. o 39. 763 1517 ~~[~26:~~;~'q~Q5 " 0 ,00 . Queue Apprpach Qejay (sX j)j~_=:c:. Approach LOS o 0 .0 0,0 Average Del ay 3.2 - 2008 w/Project PM Peak Octobe r 2006 , • 'J" tn t~rsection C~~'p'<;l':l!Y.:Q!illzati1fri2Jsi'.:,\' .16.9% ~t\~JI2P':'~~I;§tl.Slrvj~<:,. 2;;:4J1J:. :ii ffiJt~<\.[~::t~· " Gary Norris GARRYSBELL-S T 5 1 Synchro 5 Repo rt Accident Rate Analysis Threadgill et al 169th Avenue SEiSE 128th Street Intersection Rj = (NliY'6)/T*(Vl+V2+V3+V4) Rj = Rate of Accidents/million vehicles entering intersection A = Accidents recorded in T days T = Period (days) for which accidents are counted (usually 365) Vl, V2, etc = Avg annual daily traffic on each leg If only have peak hourly volumes multiply by 10 to get a daily volume A= 2 T= 1095 Vl = 6020 V2= 3730 V3= 150 V4= 0 Vt= 99000 Rj= 0.018 Accident R.ate Analysis Threadgill Et AI ~h Avenue SEISE 128th Street t5"'~ Intersection Aj = (A'10"6)W(V1+V2+V3+V4) Aj = Rate of Accidents/million vehicles entering intersection A = Accidents recorded in T days T = Period (days) for which accidents are counted (usually 365) VI, V2, etc = Avg annual daily traffic on each leg If only have peak hourly volumes multiply by 10 to get a daily volume A= 12 2002 2003 T= 1095 PDO INJ PDO INJ VI = 9370 4 I 4 I V2= 10970 V3= 3310 V4= 0 Vt= 23650 Rj= 0.463 2004 PDO INJ 4 I 0 Accident RClte Analysis Threadgill et al 160th Avenue SEISE 128th Street Intersection r=lj = (N10"6)/T*(V1+V2+V3+V4) r=lj = Rate of Accidents/million vehicles entering intersection A = Accidents recorded in T days T = Period (days) for which accidents are counted (usually 365) V1, V2, etc = Avg annual daily traffic on each leg If only have peak hourly volumes multiply by 10 to get a daily volume A= 11 2002 2003 T= 1095 PDQ INJ PDQ INJ V1 = 8390 5 I 2 J V2= 9840 V3= 540 V4= 140 Vt = 18910 Rj= 0.531 2004 PDQ INJ 4 I 0 , ED MCCARTHY, P.E., PS March 3, 2008 Mr. Bruce Whittaker King County DDES 900 Oakesdale Avenue SW Renton, W A 98055 Re: Liberty Gardens, Cavalla Development, and Threadgill Plat Recommended Stormwater Mitigations Dear Mr. Whittaker; ('.j.) '_1) ;_~; i J:.,.\'\ t I\X (4'2~:ti Xi! ,i.!'J,) As you are aware, the proposed developments of Liberty Gardens, Cavalla, and a portion of the Threadgill Plat all drain to the conveyance system along SE I 44th Street (Figure I). The results of the hydraulic assessment I prepared for the downstream conveyance system (June 15,2007) predicted flooding along the north side of SE 144'h Street and at the intersection of 160'h Avenue SE. There has also been residential flooding at SE I 42nd Place, which is adjacent and tributary to the downstream system of the proposed developments. After consideration of the basin and downstream conditions, I offer the storm water mitigations described below for the proposed plats to address existing flooding problems along SE 144'h Street and at the end ofSE 142nd Place. Onsite Storm water Mitigation Conservation flow control standards are required for the proposed Liberty Gardens, Cavalla, and Threadgill developments (King County Department of Natural Resources, January 2005). The hydraulic analysis I prepared (June 15,2007) indicates that the 18-inch diameter pipe along the south side of SE 144'h Street has a capacity of 4 to 6 cubic feet per second. Flows with return periods of2 to 5 years likely surcharge the 18-inch diameter pipe system. The roadway and ditch system along the north side ofSE 144'h Street convey the major portion of higher flows. A HEC- RAS analysis of the roadway conveyance system (Ed McCarthy, PE, PS, June 2007) for the 100- year peak rate indicates that the ditch system between 162 nd Avenue SE and 160'h Avenue SE has adequate capacity to convey the I DO-year peak rate. However, driveway culverts along this reach as well as the culverts at the intersections of 160'h Ave SE and 161 ,t Ave SE would be overtopped. The driveways along the north side of SE 144'h Street generally rise above the street as they approach the residence they access. Representative driveways along the north side ofSE 144th Street that would be flooded with higher flows are illustrated in Photos I and 2 of Attachment A. As the photographs suggest, the driveway would easily be discemable under a situation where flood flows inundate the northerly ditch and driveway culverts. The presence of flooding driveway culverts would not create umeasonable difficulties for emergency access to the residences. ) I) f- MAIN ALE C ~y '\ // f+5b) LI)YJ?~)/ , Mr. Bruce Whittaker Page 2 March 3, 2008 Based on the HEC-RAS hydraulic model used to assess the conveyance system along SE 144th Street, increasing the flow rate by 0.5 cubic foot per second, or more, would increase the flood stage above one or more of the downstream driveway culverts by more than 1'. inch (Attachment B). An increase of more than 0.5 cubic foot per second would occur for the I OO-year peak flow rate if Flow Conservation Standards were adopted for the proposed projects. As such, this would constitute aggravating an existing severe flooding problem (King County Surface Water Design Manual, p. 1-25). On the other hand, adopting Level 3 flow control would mitigate the impacts of the projects on this downstream flooding area. The predicted 100-year stage in the downstream flood flow path would not be increased. In light of the downstream conditions, providing Level 3 detention standards is an appropriate stormwater mitigation for each of the proposed developments. For the Threadgill Plat, this recommended higher level of flow control would apply only towards the western portion of the site draining to SE 144th Street. This mitigation would satisty Core Requirement #3 of the Surface Water Design Manual (Table 1.2.3.A on page 1-29). I conducted KCRTS simulations for the Cavalla and Liberty Gardens plats to estimate the stormwater detention volumes that would be required to meet Level 3 flow control standards (Attachment C). For Cavalla, I estimated a required storage volume of 132,300 cubic feet. For Liberty Gardens, I estimated a required storage volume of 114,600 cubic feet. These estimated volumes do not include a factor of safety which would increase the required volumes, nor do they account for the effects of required flow control BMPs, which would reduce the required storage volume (King County Department of Natural Resources, January 2005). Extension of I 62 nd A venue SE As part of the proposed plats, I 62 nd Avenue SE will be extended from SE 144th Street to SE 136th Street. Like the proposed plats, the proposed roadway will provided stormwater flow control and water quality treatment. Using the same rational as for the proposed plats, Level 3 flow control and basic water quality treatment would be an appropriate mitigation in managing stormwater from the proposed roadway. The proposed extension of I 62nd Avenue SE offers an opportunity to improve drainage conditions for residents at SE 142 nd Place. I understand that an open channel along the west side of the 162 nd Avenue SE right-of-way (Figure 2) will be tightlined under proposed developed conditions. The design of the tightline should be extended far enough upstream such that it effectively collects drainage that flows along the east boundary of the Gragg property located at 16046 SE 142,d Place. Both the proposed tightline and storm water control system for 162,d Avenue SE should have an overflow outlet that maintains the flow route along the north side of SE 144th Street that is predicted to occur with higher flows. Proposed Solutions to Drainage Problems at SE 142'" Place In previous corres,pondence to you, I was supportive of the idea of extending the stormwater pipe system along 160 A venue SE in effort to direct flows from the drainage course directly north of SE 142,d Place to the existing 12-inch diameter culvert system along I 60 th Avenue SE and subsequently to the storm conveyance pipe along SE 144th Street. This modification to the storm Mr. Bruce Whittaker Page 3 March 3, 2008 system would be intended to relieve some of Ibe flows from the flooding problem at residences along SE 142 0d Place. After assessing Ibis proposal in additional detail, I am no longer supportive of it. I believe Ibat adding flows to the pipe system along the lower segment of 160 'h Avenue SE could create a flooding problem for the residence at the bottom of the hill. Wilb higher flow rates, a backwater would develop in the flat reach of pipe at the bottom of 160 'h Avenue SE and surcharge an inlet pipe adjacent to the residence, increasing Ibe risk of flooding of Ibe adjacent residential property and structure. I believe Ibat Ibe most effective way to relieve the drainage problem that now occurs at properties at the end of SE 142 0d Place would be to tightline Ibe channel Ibat now traverses the east property boundaries of lots located at Ibe end ofSE 1420d Place (Figure 2). This modification to Ibe drainage system could be included in the plans for the proposed extension of I 62 nd Avenue SE. Managing runoff in this manner will resolve a drainage problem Ibat has been bothersome for several years for at least tbree residents at SE l420d Place. Gragg Property The Gragg property, located at 16046 SE l420d Place, has an additional concem Ibat could be resolved with the proposed extension and improvements along 162 0d Avenue SE. The onsite sewage disposal system on the Gragg property has been adversely affected by groundwater seepage from the channel along Ibe north property boundary. As development in Ibe upstream basin has increased runoff volumes to the channel, Ibe onsite sewage system has at times failed. The design of the sanitary sewer along 162 0d Avenue SE should include a stub out connection for the Gragg parcels to correct this ongoing problem. Please note Ibat Ibe applicants for Ibe proposed plats willingly offer the mitigations that would benefit the property owners along SE l420d Place provided that the mitigations can be designed and implemented without incurring unreasonable delays that may be confronted in acquiring construction easements, permits, or other construction-related authorizations. Mr, Bruce Whittaker Page 4 March 3, 2008 [fyou have any questions regarding my assessment or recommendations, please contact me at (425) 271-5734, Sincerely, tdward p. Plc('q,.t~ Edward McCarthy, Ph,D, P,E, Mr. Bruce Whittaker Page 5 March 3, 2008 References Ed McCarthy, PE, PS. June 16, 2007. SE 144'h Street-Level 3 Downstream Drainage Analysis. Renton, Wash. King County Department of Natural Resources, January 2005. King County Surface Water Design Manual. Seattle. u " " [" ! ~ n i ~U \ : \j f'! Vicinity Map U '- Liberty Gardens. Cavalla. Stormwater and Threadgill Mitigations King County. Washington w CIJ Q) ~ ~ ~ w CIJ Q) ~ -'" is <0 ~ Liberty Gardens w CIJ I / \ [I "-\~ ~o Cll [--~--:-~--1 ~ --.J \ \ \ ~ r---, SE 136th St~J ~: tl Cavalla I \--, I () \ \ \ '\ L_J /' I \ , I J SE 144th 5t \ D / () Ed McCarthy. PE. PS ./ 3/3/08 2.000 I Feet 9957 171s1 Avenue SE Renton, Washington 98059 Ph",.: (425) 271-5734 Figu re 1 Fax (425) 171-3432 Legend c=J RID ~ Flood Flow Path o o Type 2 CB Type 1 CB 12-18" Pipe/Culvert 24" Pipe/Culvert Photo ID See Attachment A L, ( \:--- \ \ \. \. ........ \ \ \. \ \. \ \. \. \. \. Drainage problems at Ching, Gragg, and c-~-=",:::=_ Gammel properties ~42niifjl, ---1 T ----I' 7"il;;$ll7z~ -SE GEl i "''''el i I! , I i Channel to be : I tighUined L--=,","; i I W' rtJ ,,,..,., ./ / C8-10 ' Cs'12 I , " C8-13 C6,14 C8-15 B-16 :C8-18 10+ 10 i [1EC-RA$ (HOO Station ' Downstream Map Liberty Gardens, Cavalla, Stormwater and Threadgill Mitigations King County, Washington , I , 6+60 () 200 C====JIFeel Rt10 Ed McCarthy, PE, PS 0057 171st A-..enCle SE Ren!ol1, Washlng!lln 9a059 Phone (42S) 271-5734 Fax" (425) 271·3432 3/3108 Figure 2 i i i Attachment A. Photographs of Downstream Flood Flow Path along SE 144'· Street Attachment A: Photos of the Downstream System T Photo Number I T Photo Number 2 Date of Photo: 1-02-08 Date of Photo: 1-02-08 Location: 16114 SE 144'" Street, looking north from SE 144lh Street (Figure 2) Location: 16106 SE 144'" Street, looking north from SE 144lh Street (Figure 21 Description: Gravel driveway, 12-inch diameter driveway Description: Asphalt driveway, 12-inch diameter culvert. driveway culvert. T Photo Number 3 T Photo Number 4 Date of Photo: 1-02-08 Date of Photo: 1-02-08 Location: Intersection of 161" Ave SE and SE 144'" Street, looking north from SE 144th Street Location: Roadside ditch along north side of SE 144 th Street, looking west (Figure 2) (Figure 2) Description: A 12-inch diameter culvert conveys flow Description: The ditch is primarily grass-lined with 12-inch under 161" Ave SE. culvert crossings at driveways and road intersections. T Photo Number 5 T Photo Number 6 Date of Photo: 1-02-08 Date of Photo: 1-02-08 Location: Roadside ditch along north side ofSE 144'n Location: Intersection of 160th Ave SE and SE 144" Street, looking west (Figure 2) Street, looking southwest (Figure 2) Description: The ditch is primarily grass-lined with 12-inch Description: Recent improvements to the drainage system culvert crossings at driveways and read by KC Roads Division are evident in this intersections. photo. Attachment B. HEC-RAS Analysis of Roadway Conveyance Description of inputs: Geometry: Geometry of roadway based on Barghausen Consulting Engineers field survey from June 2007. STA Description 0+00 10' west ofCB-IIA 1+60 10'west ofCB-IIB 6+60 160' east ofCB-15A-1 8+10 290' west of CB-18A 10+10 85' west of CB-18A See Figure 2 for approximate locations of stations. Flow: Exis -Based on cumulative I DO-year peak flow rate to the conveyance system predicted by KCRTS I-hour time series minus the estimated capacity ofthe 18-inch pipe on the south side of SE 144th Street (5.0 cfs). Dev - A simulation was also conducted to determine the incremental flow rate that would increase the flood elevations by V. inch. This incremental flow rate was determined to be 0.5 cfs. 380 378 376 is c ~ > m W 374 372 '" + ~ ill 370 I 0 200 SE 144th Roadway Conveyance Plan: SE144th Roadway 6/17/2007 400 Geom: SE144th Flow: Roadway Q 144th 1 g + '" ill 600 Main Channel Distance (ft) 0 + '" ill 800 ~ 0 + 0 ~ ill 1000 1200 Legend WS Exis ~ Grouna ROB w '" I ~ o " "q-'-'';'~ ~ ~ , ~ 0 " " • < 0 . 0 < " .~~ " " " " " " " (y) ~0I!eA"'3 § " ~ ~ 8 8 -" ~ '" ~ ~ i3 ~ • ~ ~ • • ~ ~ ~ ~ o _ ~ . ~ 0 5 a • <a. ~ > ; t: ~I~ w " W " ~". :"a:~ ~!!l: -lid g ([ u.. ~ 0::"-';;- c " e , · ~) 0 j ~!] • • o. ~ ~ l'., !2,E£ ~~ • 2 • 0 g ~ ~ U U l ~ ~ " ~ • 0 0 ~ • 0 ~ a: ~ £ ~ ~ w w ~~ ~ "' 0 c " i~ + • " 0 1 0 0 . b-" 0 " 0 ." " 0 . o· " " " " " " " " ~ " ~ " " ~ ~ " " (v)UOO1RA"I3 (II) 1.IO!)e ..... 13 HEC-RAS Plan: SE144th River: 144th Reach: 1 Keach KNer::ita I Profile Q Total Min Ch EI W.S. Elev -"Grit W.S. E.~.:...~lev. E.G. Slope ! Ve~ Chnl I Flow Area Top Width I Froude # Chi I lets) 1ft) 1ft) (ft) 1ft), (ftIft) I Ift/s) 1 (00 ft) 1ft) J -~ ,1 ----~!Q-----1~ __ ----,-20.09 ~78.07__ ?78.44 ~~~t-3?~.~J O.Q_Q5394! __ ?69 -L 1010 jDev _~q.59 378.07, _ 378.45 378.24 378.521 0.005366 2.72 7,44 7.60 20.08 20.72 1.35 1.36 =t ---1_ ----- 20.09 376.47 376.22 376.22 376.57 0.023460; 4.23 6.22 0.00 11 20.59 3~6:~7~. 3~~.24 376.24 3?6.59 O.023355_~ ~ 4.32 ~j ___ ~ 1 1660 I Exis 20.09 i 11660 T-__ _20:591_ i 1 1'60 _'-;:Ex:='~S __ _ 11 160 De .... 22.42 22.92 373.691- 373.691- 370.90 ~ 370.90 1 ---, 373.70 373.33 373.70 373.35, 371.6~_f-_ 3~~.63 371.64 371.64 373.84 373.85 371.77 371.78 0.0068771- 0.007151' 0.0028671 0.002807 0.31 0.39 3.25 3.23 6.62 _ 6.6-'1-. 7.92 8.14, ~ I 7.79 7.92 26.69 29.29 0.86 0.93 1.121 1.11 ',0 ~$---22.42 37-~--37i-~ 0.003401 3.00 ____ ~.76j _~ -44.-461 1.171 _~ De~ ____ . 22.92 370.70 __ 3!.1~_ 0.003400: 3.01 9.951 45.20 1.17 Attachment C. KCRTS Detention Volume Estimates Cavalla -Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FE: Effective Storage Depth: Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Detention Pond 2.00 H:1V 214.94 ft 107.47 ft 23100. sq. ft 31414. sq. ft 0.721 acres 5.00 ft 0.00 ft 132287. cu. ft 3.037 ac-ft 5.00 ft 18.00 inches 3 Full Head Pipe Orifice # Height (ft) Diameter (w) 1. 68 2.90 1. 60 Discharge (CFS) 0.171 0.323 0.082 Diameter (in) Area 1 0.00 2 3.00 3 3.60 Top Notch Weir: None Outflow Rating Curve: None Stage Elevation Storage (ft) (ft) (cu. ft) (ac-ft) 0.00 0.00 O. 0.000 0.02 0.02 462. 0.011 0.04 0.04 925. 0.021 0.05 0.05 1157. 0.027 0.07 0.07 1620. 0.037 0.09 0.09 2084. 0.048 0.11 0.11 2549. 0.059 0.12 0.12 2781. 0.064 0.14 0.14 3247. 0.075 0.24 0.24 5581. 0.128 0.34 0.34 7929. 0.182 0.44 0.44 10289. 0.236 0.54 0.54 12663. 0.291 0.64 0.64 15050. 0.345 0.74 0.74 17449. 0.401 0.84 0.84 19862. 0.456 0.94 0.94 22288. 0.512 1. 04 1. 04 24727. 0.568 1.14 1.14 27180. 0.624 1. 24 1. 24 29646. 0.681 1. 34 1. 34 32125. 0.737 1. 44 1. 44 34617 . 0.795 1. 54 1. 54 37123. 0.852 1. 64 1. 64 39642. 0.910 1. 74 1 .74 42174. 0.968 6.0 4.0 Discharge (cfs) 0.000 0.010 0.014 0.018 0.020 0.023 0.025 0.027 0.029 0.038 0.045 0.051 0.056 0.061 0.066 0.070 0.074 0.078 0.082 0.085 0.089 0.092 0.095 0.098 0.101 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 Surf (sq. ft) 23100. 23126. 23152. 23165. 23190. 23216. 23242. 23255. 23281. 23410. 23540. 23671. 23801. 23932. 24063. 24195. 24326. 24459. 24591. 24724. 24857. 24990. 25124. 25258. 25392. 1. 84 1. 94 2.04 2.14 2.24 2.34 2.44 2.54 2.64 2.74 2.84 2.94 3.00 3.03 3.06 3.09 3.12 3.15 3.18 3.21 3.24 3.34 3.44 3.54 3.60 3.62 3.63 3.65 3.67 3.68 3.70 3.72 3.73 3.75 3.85 3.95 4.05 4.15 4.25 4.35 4.45 4.55 4.65 4.75 4.85 4.95 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 1. 84 1. 94 2.04 2.14 2.24 2.34 2.44 2.54 2.64 2.74 2.84 2.94 3.00 3.03 3.06 3.09 3.12 3.15 3.18 3.21 3.24 3.34 3.44 3.54 3.60 3.62 3.63 3.65 3.67 3.68 3.70 3.72 3.73 3.75 3.85 3.95 4.05 4.15 4.25 4.35 4.45 4.55 4.65 4.75 4.85 4.95 5.00 5.10 5.20 5.30 5.40 5.50 5.60 5.70 5.80 5.90 6.00 44720. 47280. 49853. 52439. 55039. 57653. 60281. 62922 . 65576. 68245. 70927. 73623. 75247. 76061. 76877. 77693. 78511. 79330. 80150. 80972. 81795. 84546. 87312. 90091. 91766. 92325. 92605. 93165. 93726. 94006. 94568. 95130. 95411. 95974. 98797. 101635. 104486. 107352. 110232. 113126. 116034. 118957. 121894. 124845. 127811. 130792. 132287. 135289. 138306. 141337. 144383. 147443. 150518. 153608. 156713. 159832. 162966. 1.027 0.104 1.085 0.107 1.144 0.109 1.204 0.112 1.264 0.115 1.324 0.117 1.384 0.120 1.444 0.122 1.505 0.124 1.567 0.127 1.628 0.129 1.690 0.131 1.727 0.133 1.746 0.135 1.765 0.142 1.784 0.154 1.802 0.169 1.821 0.188 1.840 0.211 1.859 0.237 1.878 0.250 1.941 0.273 2.004 0.294 2.068 0.312 2.107 0.322 2.119 0.325 2.126 0.330 2.139 0.335 2.152 0.341 2.158 0.349 2.171 0.357 2.184 0.364 2.190 0.369 2.203 0.373 2.268 0.395 2.333 0.416 2.399 0.434 2.464 0.452 2.531 0.469 2.597 0.485 2.664 0.500 2.731 0.515 2.798 0.529 2.866 0.543 2.934 0.557 3.003 0.570 3.037 0.576 3.106 1.050 3.175 1.910 3.245 3.010 3.315 4.320 3.385 5.800 3.455 7.240 3.526 7.780 3.598 8.280 3.669 8.750 3.741 9.200 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 25527 . 25662. 25797. 25933. 26069. 26205. 26342. 26479. 26616. 26754. 26892. 27030. 27113. 27155. 27196. 27238. 27279. 27321. 27363. 27405. 27446. 27586. 27726. 27866. 27950. 27978. 27992. 28020. 28049. 28063. 28091. 28119. 28133. 28161. 28302. 28444. 28586. 28728. 28870. 29013. 29156. 29299. 29443. 29587. 29731. 29876. 29948. 30093. 30239. 30385. 30531. 30677. 30824. 30971. 31118. 31266. 31414. 6.10 6.10 166115. 6.20 6.20 169278. 6.30 6.30 172457. 6.40 6.40 175650. 6.50 6.50 178859. 6.60 6.60 182082. 6.70 6.70 185320. 6.80 6.80 188574. 6.90 6.90 191842. 7.00 7.00 195126. Hyd Inflow Outflow Peak Target Calc Stage 1 3.76 ******* 0.79 5.05 2 1. 86 ******* 0.52 4.62 3 2.24 ******* 0.45 4.12 4 I .87 ******* 0.44 4.11 5 1. 98 ******* 0.29 3.42 6 1.17 ******* 0.15 3.09 7 1. 52 ******* 0.13 2.84 8 1. 65 ******* 0.11 1. 97 Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdoutlev3 Inflow/Outflow Analysis Peak Inflow Discharge: 3.76 Peak Outflow Discharge: 0.792 Peak Reservoir Stage: 5.05 Peak Reservoir Elev: 5.05 Peak Reservoir Storage: 133653. 3.068 Flow Frequency Analysis Time Series File:rdoutlev3.tsf Project Location:Sea-Tac 3.813 9.630 0.00 3.886 10.030 0.00 3.959 10.420 0.00 4.032 10.800 0.00 4.106 11. 160 0.00 4.180 11. 510 0.00 4.254 11.850 0.00 4.329 12.190 0.00 4.404 12.510 0.00 4.479 12.820 0.00 Storage Elev (eu-Ft) (Ac-Ft) 5.05 133653. 3.068 4.62 121022. 2.778 4.12 106597. 2.447 4.11 106118. 2.436 3.42 86855. 1.994 3.09 77629. 1.782 2.84 70843. 1.626 1. 97 48102. 1. 104 CFS at 6: 00 on Jan 9 in Year 8 CFS at 12:00 on Jan 9 in Year 8 Ft Ft Cu-Ft Ac-Ft ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak - -Peaks - -Rank Return (CFS) (CFS) (ft) Period 0.537 2 2/09/01 20:00 0.792 5.05 1 100.00 0.130 7 1/07/02 3:00 0.537 4.71 2 25.00 0.448 3 3/06/03 22:00 0.448 4.13 3 10.00 0.108 8 8/26/04 7:00 0.444 4.11 4 5.00 0.153 6 1/08/05 5:00 0.291 3.43 5 3.00 0.291 5 1/19/06 0:00 0.153 3.09 6 2.00 0.444 4 11/24/06 8:00 0.130 2.88 7 1. 30 0.792 1 1/09/08 12:00 0.108 1. 97 8 1.10 Computed Peaks 0.707 5.03 50.00 Flow Duration from Time Series File:rdoutlev3.tsf Cutoff Count Frequency CDF Exceedence_Probability CFS % % % 0.008 0.023 29873 5807 48.717 9.470 48.717 58.187 51.283 41.813 0.513E+00 0.418E+00 Prob 0.990 0.960 0.900 0.800 0.667 0.500 0.231 0.091 0.980 31562. 31711. 31860. 32009. 32159. 32309. 32459. 32609. 32760. 32912. 0.038 5674 9.253 67.440 32.560 0.326E+00 0.053 5278 8.607 76.047 23.953 0.240E+00 0.068 4651 7.585 83.632 16.368 0.164E+00 0.083 3976 6.484 90.116 9.884 0.988E-Ol 0.098 2180 3.555 93.671 6.329 0.633E-Ol 0.113 1584 2.583 96.254 3.746 0.375E-Ol 0.128 1475 2.405 98.659 1.3H 0.134E-Ol 0.144 416 0.678 99.338 0.662 0.662E-02 0.159 47 0.077 99.415 0.585 0.585E-02 0.174 23 0.038 99.452 0.548 0.548E-02 0.189 17 0.028 99.480 0.520 0.520E-02 0.204 17 0.028 99.507 0.492 0.492E-02 0.219 18 0.029 99.537 0.463 0.463E-02 0.234 18 0.029 99.566 0.434 0.434E-02 0.249 18 0.029 99.596 0.404 0.404E-02 0.264 39 0.064 99.659 0.341 0.341E-02 0.279 31 0.051 99.710 0.290 0.290E-02 0.294 31 0.051 99.760 0.240 0.240E-02 0.310 23 0.038 99.798 0.202 0.202E-02 0.325 16 0.026 99.824 0.176 0.176E-02 0.340 7 0.011 99.835 0.165 0.165E-02 0.355 3 0.005 99.840 0.160 0.160E-02 0.370 9 0.015 99.855 0.145 O.145E-02 0.385 10 0.016 99.871 0.129 0.129E-02 0.400 9 0.015 99.886 0.114 0.114E-02 0.415 10 0.016 99.902 0.098 0.978E-03 0.430 10 0.016 99.918 0.082 0.815E-03 0.445 12 0.020 99.938 0.062 0.620E-03 0.461 11 0.018 99.956 0.044 0.440E-03 0.476 8 0.013 99.969 0.031 0.310E-03 0.491 4 0.007 99.976 0.024 0.245E-03 0.506 3 0.005 99.980 0.020 0.196E-03 0.521 5 0.008 99.989 0.011 o .1l4E-03 0.536 5 0.008 99.997 0.003 0.326E-04 Duration Comparison Anaylsis Base File: forest.tsf New File: rdoutlev3.tsf Cutoff Units: Discharge in CFS -----Fraction of Time--------------Check of Tolerance------- Cutoff Base New %Change Probability Base New %Change 0.137 0.95E-02 0.72E-02 -24.5 I 0.95E-02 0.137 0.131 -4.2 0.174 0.63E-02 0.55E-02 -13 .2 I 0.63E-02 0.174 0.150 -14.2 0.212 0.50E-02 0.47E-02 -4.9 I 0.50E-02 0.212 0.203 -4.4 0.249 0.37E-02 0.40E-02 8.8 I 0.37E-02 0.249 0.259 3.8 0.287 0.29E-02 0.27E-02 -6.3 I 0.29E-02 0.287 0.282 -1. 8 0.324 0.22E-02 0.18E-02 -20.6 I 0.22E-02 0.324 0.301 -7.0 0.362 0.15E-02 0.15E-02 2.2 I O.15E-02 0.362 0.369 1.9 0.399 O.10E-02 o .llE-02 11.1 I 0.10E-02 0.399 0.413 3.5 0.437 0.62£-03 0.77E-03 23.7 I 0.62E-03 0.437 0.445 1.9 0.474 0.34E-03 0.31E-03 -9.5 I 0.34E-03 0.474 0.473 -0.2 0.512 0.21E-03 o .16E-03 -23.1 I 0.21E-03 0.512 0.501 -2.1 0.549 0.16E-03 O.OOE+OO -100.0 I 0.16E-03 0.549 0.512 -6.8 0.586 0.11E-03 O.OOE+OO -100.0 I o .l1E-03 0.586 0.522 -11. 0 0.624 0.16E-04 0.00£+00 -100.0 I 0.16£-04 0.624 0.537 -14.0 Maximum positive excursion ~ 0.020 cfs ( 4.9%) occurring at 0.407 cfs on the Base Oata:forest.tsf and at 0.427 cfs on the New Data:rdoutlev3.tsf Maximum negative excursion = 0.027 cfs (-16.0%) occurring at 0.169 cfs on the Base Oata:forest.tsf and at 0.142 cfs on the New Data:rdoutlev3.tsf Cavalla -Time Series KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tac forest.tsf 1.00 Computing Series Regional Scale Factor : Data Type : Reduced Creating Hourly Time Series File Till Forest Loading Time Series File:C:\KC SWDM\KC DATA\STTF60R.rnf 9.91 acres Total Area 9.91 acres Peak Discharge: 0.799 CFS at 9:00 on Jan 9 in Year 8 Storing Time Series File:forest.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command Compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:forest.tsf Flow Frequency Analysis Time Series File:forest.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:forest.pks Analysis Tools Command compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:forest.tsf Durations & Exceedence Probabilities to File:forest.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae 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 3.54 acres Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60R.rnf 6.37 acres Total Area 9.91 acres Peak Discharge: 3.76 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 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 Command compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:dev.tsf Durations & Exceedence Probabilities to File:dev.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command eXit KCRTS Program Cavalla -Peak Flow Rates Flow Frequency Analysis Time Series File:forest.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of (CFS) 0.625 2 2/09/01 0.170 7 1/06/02 0.463 4 2/28/03 0.017 8 3/24/04 0.275 6 1/05/05 0.480 3 1/18/06 0.404 5 11/24/06 0.799 1 1/09/08 Computed Peaks Flow Frequency Analysis Time Series File:dev.tsf Project Location:Sea-Tac Peak 18:00 3:00 3:00 20:00 8:00 21:00 4:00 9:00 ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 1. 86 6 2/09/01 2:00 1. 52 8 1/05/02 16:00 2.24 3 2/27/03 7:00 1. 65 7 8/26/04 2:00 1. 99 4 10/28/04 16:00 1. 98 5 1/18/06 16:00 2.40 2 10/26/06 0:00 3.76 1 1/09/08 6: 00 Computed Peaks Flow Frequency Analysis Time Series File:rdout.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.536 2 2/09/01 20:00 0.130 7 1/07/02 4:00 0.448 3 3/06/03 22:00 0.107 8 8126/04 7:00 0.150 6 1/08/05 5:00 0.289 5 1/19/06 0:00 0.442 4 11/24/06 8:00 0.765 1 1/09/08 12:00 Computed Peaks -----Flow Frequency Analysis------- - -Peaks Rank Return Frob (CFS) Period 0.799 I 100.00 0.990 0.625 2 25.00 0.960 0.480 3 10.00 0.900 0.463 4 5.00 0.800 0.404 5 3.00 0.667 0.275 6 2.00 0.500 0.170 7 1. 30 0.231 0.017 8 1.10 0.091 0.741 50.00 0.980 -----Flow Frequency Analysis------- - -Peaks Rank Return Prob (CFS) Period 3.76 1 100.00 0.990 2.40 2 25.00 0.960 2.24 3 10.00 0.900 1. 99 4 5.00 0.800 1. 98 5 3.00 0.667 1. 86 6 2.00 0.500 1. 65 7 1. 30 0.231 1. 52 8 1.10 0.091 3.31 50.00 0.980 -----Flow Frequency Analysis------- --Peaks - -Rank Return Prob (CFS) (ft) Period 0.765 5.04 1 100.00 0.990 0.536 4.70 2 25.00 0.960 0.448 4.13 3 10.00 0.900 0.442 4.10 4 5.00 0.800 0.289 3.42 5 3.00 0.667 0.150 3.08 6 2.00 0.500 0.130 2.88 7 1. 30 0.231 0.107 1. 96 8 1.10 0.091 0.689 5.02 50.00 0.980 0.8 --+--Existing - - B - -Developed 0.7 0.6 0.2 0.1 O+-~~~~--~~~r-~~~~~~~~~~~~~ 1.00E-05 1.00E-04 1.00E-03 1.00E-02 1.00E-01 1.00E+00 Probability of Exceedence Flow Duration Curves for RID. Duration curves are shown at pond outlet. The pond is designed to meet Level 3 flow control standards. Liberty Gardens -Retention/Detention Facility Type of Facility: Side Slope: Pond Bottom Length: Pond Bottom Width: Pond Bottom Area: Top Area at 1 ft. FB: Detention Pond 2.00 H:1V 144.91 ft 72.46 ft 10500. sq. ft 19621. sq. ft 0.450 acres Effective Storage Depth: 8.00 403.00 114554. 2.630 8.00 18.00 3 ft ft Area Stage 0 Elevation: Storage Volume: Riser Head: Riser Diameter: Number of orifices: Orifice # 1 2 3 Height (ft) 0.00 5.60 6.80 Diameter (in) 1. 30 2.20 2.40 cu. ft ac-ft ft inches Full Head Pipe Discharge (CFS) 0.130 0.203 0.171 Diameter (in) 6.0 6.0 Top Notch Weir: None Outflow Rating Curve: None Stage (ft) 0.00 0.01 0.03 0.04 0.05 0.07 0.08 0.09 0.11 0.27 0.42 0.58 0.74 0.89 1. 05 1.21 1. 36 1. 52 1. 68 1. 83 1. 99 2.15 2.30 2.46 2.62 2.78 2.93 Elevation (ft) 403.00 403.01 403.03 403.04 403.05 403.07 403.08 403.09 403.11 403.27 403.42 403.58 403.74 403.89 404.05 404.21 404.36 404.52 404.68 404.83 404.99 405.15 405.30 405.46 405. 62 405.78 405.93 Storage Discharge Percolation (cu. ft) (ac-ft) (efs) O. 0.000 0.000 105. 0.002 0.005 315. 0.007 0.008 421. 0.010 0.009 526. 0.012 0.011 737. 0.017 0.012 843. 0.019 0.013 949. 0.022 0.014 1160. 0.027 0.015 2867. 0.066 0.024 4487. 0.103 0.030 6237. 0.143 0.035 8010. 0.184 0.039 9693. 0.223 0.043 11510. 0.264 0.047 13351. 0.306 0.050 15098. 0.347 0.054 16983. 0.390 0.057 18892. 0.434 0.059 20704. 0.475 0.062 22659. 0.520 0.065 24638. 0.566 0.067 26515. 0.609 0.070 28540. 0.655 0.072 30590. 0.702 0.074 32664. 0.750 0.076 34631. 0.795 0.078 (efs) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Surf (sq. ft) 10500. 10509. 10526. 10535. 10544. 10561. 10570. 10578. 10596. 10736. 10868. 11010. 11152. 11287. 11431. 11575. 11712. 11859. 12006. 12145. 12294. 12443. 12584. 12736. 12888. 13041. 13185. 3.09 3.25 3.40 3.56 3.72 3.87 4.03 4.19 4.34 4.50 4.66 4.81 4.97 5.13 5.28 5.44 5.60 5.62 5.65 5.67 5.69 5.71 5.74 5.76 5.78 5.94 6.10 6.25 6.41 6.57 6.72 6.80 6.83 6.85 6.88 6.90 6.93 6.95 6.98 7.00 7.16 7.31 7.47 7.63 7.78 7.94 8.00 8.10 8.20 8.30 8.40 8.50 8.60 8.70 8.80 8.90 9.00 406.09 406.25 406.40 406.56 406.72 406.87 407.03 407.19 407.34 407.50 407.66 407.81 407.97 408.13 408.28 408.44 408.60 408.62 408.65 408.67 408.69 408.71 408.74 408.76 408.78 408.94 409.10 409.25 409.41 409.57 409.72 409.80 409.83 409.85 409.88 409.90 409.93 409.95 409.98 410.00 410.16 410.31 410.47 410.63 410.78 410.94 411.00 411.10 411.20 411 . 30 411. 40 411 . 50 411.60 411. 70 411. 80 411.90 412.00 36753. 38900. 40935. 43130. 45351. 47455. 49725. 52020. 54195. 56540. 58910. 61157. 63578. 66026. 68345. 70844. 73370. 73688. 74165. 74484. 74803. 75122. 75602. 75923. 76244. 78827 . 81437. 83909. 86572. 89263. 91811. 93179. 93694. 94038. 94555. 94900. 95418. 95764. 96284. 96632. 99425. 102069. 104917. 107793. 110516. 113447. 114554. 116408. 118273. 120149. 122036. 123935. 125846. 127768. 129701. 131646. 133602. 0.844 0.081 0.893 0.083 0.940 0.085 0.990 0.086 1.041 0.088 1.089 0.090 1.142 0.092 1.194 0.094 1.244 0.096 1.298 0.097 1.352 0.099 1.4040.101 1.460 0.102 1.516 0.104 1.569 0.105 1.626 0.107 1.684 0.108 1.692 0.110 1.703 0.114 1.710 0.120 1.717 0.129 1.725 0.140 1.736 0.153 1.743 0.163 1.750 0.166 1.810 0.188 1.870 0.206 1.926 0.221 1.987 0.234 2.049 0.247 2.108 0.258 2.139 0.263 2.151 0.266 2.159 0.273 2.171 0.282 2.179 0.293 2.191 0.308 2.198 0.325 2.210 0.340 2.218 0.346 2.282 0.380 2.343 0.408 2.409 0.433 2.475 0.456 2.537 0.477 2.604 0.497 2.630 0.504 2.672 0.978 2.715 1.830 2.758 2.940 2.802 4.250 2.845 5.730 2.889 7.160 2.933 7.700 2.978 8.200 3.022 8.670 3.067 9.120 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 13339. 13495. 13641. 13798. 13956. 14105. 14264. 14424. 14575. 14737. 14899. 15052. 15217. 15382. 15537. 15703. 15871. 15892. 15923. 15944. 15965. 15986. 16018. 16039. 16060. 16229. 16399. 16559. 16731. 16903. 17065. 17152. 17185. 17207. 17239. 17261. 172 94. 17316. 17349. 17370. 17546. 17711. 17888. 18066. 18233. 18412. 18480. 18593. 18706. 18819. 18933. 19047. 19161. 1927 6. 19390. 19506. 19621. 9.10 412.10 135570. 3.112 9.550 0.00 9.20 412.20 137549. 3.158 9.950 0.00 9.30 412.30 139541. 3.203 10.340 0.00 9.40 412.40 141543. 3.249 10.720 0.00 9.50 412.50 143558. 3.296 11. 080 0.00 9.60 412.60 145584. 3.342 11. 430 0.00 9.70 412.70 147622. 3.389 11.770 0.00 9.80 412.80 149672 . 3.436 12.100 0.00 9.90 412.90 151734. 3.483 12.420 0.00 Hyd Inflow Outflow Peak Storage Stage Elev (Cu-Ft) (Ac-Ft) 1 3.15 0.68 8.04 411.04 115252. 2.646 2 1. 56 0.45 7.58 410.58 106940. 3 1. 88 0.39 7.24 410.24 100750. 4 1. 57 0.26 6.81 409.81 93266. 5 1. 65 0.16 5.75 408.75 75705. 6 1. 27 0.10 5.09 408.09 65382. 7 1. 38 0.08 3.39 406.39 40741. 8 0.98 0.10 5.26 408.26 68077 . Hyd RID Facility Tributary Reservoir poe Outflow Outflow Inflow Inflow 1 0.68 0.12 ******** 2 0.45 0.06 ******** 3 0.39 0.07 ******** 4 0.26 0.06 ******** 5 0.16 0.06 ******** 6 0.10 0.05 ******** 7 0.08 0.06 ******** 8 0.10 0.04 ******** ---------------------------------- Route Time Series through Facility Inflow Time Series File:dev.tsf Outflow Time Series File:rdoutlev3 poe Time Series File:dsoutlev3 Inflow/Outflow Analysis Peak Inflow Discharge: 3.16 Peak Outflow Discharge: 0.683 Peak Reservoir Stage: 8.04 Peak Reservoir Elev: 411. 04 CFS CFS Ft Ft Target ******* ******* ******* ******* ******* ******* ******* ******* at 6:00 at 11: 00 Peak Reservoir Storage: 115252. Cu-Ft 2.646 Ac-Ft Add Time Series:bypass.tsf Calc 0.71 0.47 0.41 0.28 0.16 0.14 0;14 0.13 on Jan on Jan 2.455 2.313 2.141 1. 738 1.501 0.935 1. 563 9 in 9 in Year 8 Year 8 Peak Summed Discharge: 0.706 CFS at 11:00 on Jan 9 in Year 8 Point of Compliance File:dsout1ev3.tsf Flow Frequency Analysis Time Series File:rdoutlev3.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--------Flow Frequency Analysis------- Flow Rate Rank Time of Peak --Peaks - -Rank Return Prob (CFS) (CFS) (ft) Period 0.475 2 2109/01 20:00 0.683 8.04 1 100.00 0.990 19737. 19853. 19970. 20087. 20204. 20322. 20439. 20558. 20676. 0.103 7 1/07/02 3:00 0.475 7.76 2 25.00 0.960 0.396 3 3/06/03 22:00 0.396 7.25 3 10.00 0.900 0.085 8 8/26/04 7:00 0.263 6.80 4 5.00 0.800 0.105 6 1/08/05 2:00 0.159 5.75 5 3.00 0.667 0.159 5 1/19/06 5:00 0.105 5.25 6 2.00 0.500 0.263 4 11/24/06 9:00 0.103 5.08 7 1. 30 0.231 0.683 1 1/09/08 11: 00 0.085 3.38 8 1.10 0.091 Computed Peaks 0.613 8.02 50.00 0.980 Flow Frequency Analysis Time Series File:dsoutlev3.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 0.493 2 2/09/01 19:00 0.706 1 100.00 0.990 0.142 6 1/05/02 16:00 0.493 2 25.00 0.960 0.409 3 3/06/03 21: 00 0.409 3 10.00 0.900 0.138 7 8/26/04 2:00 0.283 4 5.00 0.800 0.130 8 1/05/05 8:00 0.159 5 3.00 0.667 0.159 5 1/19/06 5:00 0.142 6 2.00 0.500 0.283 4 11/24/06 6:00 0.138 7 1. 30 0.231 0.706 1 1/09/08 11: 00 0.130 8 1.10 0.091 Computed Peaks 0.635 50.00 0.980 Flow Duration from Time Series File:rdoutlev3.tsf Cutoff Count Frequency COF Exceedence Probabillty CFS % % % 0.007 28877 47.092 47.092 52.908 0.529E+00 0.020 7017 11. 443 58.536 41. 4 64 0.415E+00 0.033 5922 9.658 68.193 31. 807 0.318E+00 0.047 5531 9.020 77.213 22.787 0.228E+00 0.060 5072 8.271 85.484 14.516 0.145E+00 0.073 3690 6.018 91. 502 8.498 0.850E-01 0.087 2268 3.699 95.201 4.799 0.480E-Ol 0.100 1702 2.776 97.976 2.024 0.202E-Ol 0.114 837 1. 365 99.341 0.659 0.659E-02 0.127 37 0.060 99.401 0.598 0.598E-02 0.140 17 0.028 99.429 0.571 0.571E-02 0.154 26 0.042 99.472 0.528 0.528E-02 0.167 30 0.049 99.521 0.479 0.479E-02 0.180 45 0.073 99.594 0.406 0.406E-02 0.194 49 0.080 99.674 0.326 0.326E-02 0.207 40 0.065 99.739 0.261 0.261E-02 0.220 26 0.042 99.781 0.219 0.219E-02 0.234 18 0.029 99.811 0.189 0.189E-02 0.247 18 0.029 99.840 0.160 0.160E-02 0.260 31 0.051 99.891 0.109 0.109E-02 0.274 13 0.021 99.9l2 0.088 0.88lE-03 0.287 3 0.005 99.917 0.083 0.832E-03 0.300 2 0.003 99.920 0.080 0.799E-03 0.314 1 0.002 99.922 0.078 0.783E-03 0.327 1 0.002 99.923 0.077 0.766E-03 0.340 1 0.002 99.925 0.075 0.750E-03 0.354 6 0.010 99.935 0.065 0.652E-03 0.367 6 0.010 99.945 0.055 0.554E-03 0.380 6 0.010 99.954 0.046 0.457E-03 0.394 9 0.015 99.969 0.031 0.310E-03 0.407 3 0.005 99.974 0.026 0.261E-03 0.420 2 0.003 99.977 0.023 0.228E-03 0.434 3 0.005 99.982 0.018 0.179E-03 0.447 3 0.005 99.987 0.013 o .130E-03 0.460 3 0.005 99.992 0.008 0.815E-04 0.474 3 0.005 99.997 0.003 0.326E-04 Flow Duration from Time Series File:dsoutlev3.tsf Cutoff Count Frequency CDF Exceedence_Probability CFS % % % 0.007 28952 47.215 47.215 52.785 0.528E+00 0.021 7029 11. 463 58.677 41. 323 0.413E+00 0.035 5796 9.452 68.129 31.871 0.319E+00 0.049 5806 9.468 77.598 22.402 0.224E+00 0.062 4882 7.962 85.559 14.441 0.144E+00 0.076 3682 6.005 91.564 8.436 0.844E-Ol 0.090 2261 3.687 95.251 4.749 0.475E-01 0.104 1756 2.864 98.115 1. 885 0.189E-01 0.118 642 1. 047 99.162 0.838 0.838E-02 0.132 100 0.163 99.325 0.675 0.675E-02 0.146 61 0.099 99.424 0.576 0.576E-02 0.160 32 0.052 99.477 0.523 0.523E-02 0.173 43 0.070 99.547 0.453 0.453E-02 0.187 41 0.067 99.614 0.386 0.386E-02 0.201 43 0.070 99.684 0.316 0.316E-02 0.215 47 0.077 99.760 0.240 0.240E-02 0.229 18 0.029 99.790 o .2l0 0.210E-02 0.243 16 0.026 99.816 0.184 o .184E-02 0.257 24 0.039 99.855 0.145 0.145E-02 0.270 26 0.042 99.897 0.103 0.103E-02 0.284 8 0.013 99.910 0.090 0.897E-03 0.298 4 0.007 99.917 0.083 0.832E-03 0.312 1 0.002 99.918 0.082 O.815E-03 0.326 3 0.005 99.923 0.077 0.766E-03 0.340 1 0.002 99.925 0.075 0.750E-03 0.354 3 0.005 99.930 0.070 0.701E-03 0.367 4 0.007 99.936 0.064 0.636E-03 0.381 8 0.013 99.949 0.051 0.506E-03 0.395 4 0.007 99.956 0.044 0.440E-03 0.409 9 0.015 99.971 0.029 O.294E-03 0.423 3 0.005 99.976 0.024 0.245E-03 0.437 2 0.003 99.979 0.021 0.212E-03 0.451 3 0.005 99.984 0.016 O.163E-03 0.464 3 0.005 99.989 0.011 o . 114E-03 0.478 3 0.005 99.993 0.007 0.652E-04 0.492 3 0.005 99.998 0.002 0.163E-04 Duration Comparison Anaylsis Base File: forest.tsf New File: dsoutlev3.tsf Cutoff Units: Discharge in CFS -----Fraction of Time--------------Check of Tolerance------- Cutoff Base New %Change Probability Base New %Change 0.120 0.95E-02 0.81E-02 -14.6 I 0.95E-02 0.120 0.114 -5.0 0.152 0.63E-02 0.55E-02 -12.7 I 0.63E-02 0.152 0.140 -8.1 0.185 0.50E-02 0.40E-02 -19.1 0.50E-02 0.185 0.168 -9.3 0.218 0.37E-02 0.23E-02 -37.0 0.37E-02 0.218 0.190 -12.5 0.250 0.29E-02 0.17E-02 -41. 7 0.29E-02 0.250 0.207 -17.1 0.283 0.22E-02 0.91E-03 -58.8 0.22E-02 0.283 0.225 -20.6 0.316 0.15E-02 0.80E-03 -46.2 0.15E-02 0.316 0.255 -19.1 0.348 0.10E-02 0.73E-03 -27.4 0.10E-02 0.348 0.274 -21. 4 0.381 0.62E-03 0.51E-03 -18.4 0.62E-03 0.381 0.370 -2.9 0.414 0.34E-03 0.26E-03 -23.8 0.34E-03 0.414 0.404 -2.3 0.446 0.21E-03 0.16E-03 -23.1 0.21E-03 0.446 0.439 -1. 6 0.479 0.16E-03 0.65E-04 -60.0 0.16E-03 0.479 0.454 -5.3 0.512 0.11E-03 O.OOE+OO -100.0 o .l1E-03 0.512 0.468 -8.6 0.544 0.16E-04 O.OOE+OO -100.0 o . 16E-04 0.544 0.492 -9.6 There is no positive excursion Maximum negative excursion = 0.077 cfs (-22.4%) occurring at 0.342 cfs on the Base Data:forest.tsf and at 0.266 cfs on the New Data:dsoutlev3.tsf · Liberty Gardens -T~ Series KCRTS Command CREATE a new Time Series Production of Runoff Time Series Project Location : Sea-Tae Computing Series forest.tsf Regional Scale Factor: 1.00 Data Type : Reduced Creating Hourly Time Series File Till Forest Loading Time Series File:C:\KC SWDM\KC DATA\STTF60R.rnf 8.64 acres Total Area 8.64 acres Peak Discharge: 0.697 CFS at 9:00 on Jan 9 in Year 8 Storing 'rime Series File: forest. tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module Analysis Tools Command compute PEAKS and Flow Frequencies Loading Stage/Discharge curve:forest.tsf Flow Frequency Analysis Time Series File:forest.tsf Project Location:Sea-Tac Frequencies & Peaks saved to File:forest.pks Analysis Tools Command compute Flow DURATION and Exceedence Loading Time Series File:forest.tsf Computing Interval Locations Computing Flow Durations Project Location Durations & Exceedence Probabilities to File:forest.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command CREATE a new Time Series Production of Runoff Time Series Sea-Tac 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 3.10 acres Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60R.rnf 5.29 acres Total Area 8.39 acres Peak Discharge: 3.16 CFS at 6:00 on Jan 9 in Year 8 Storing Time Series Fi1e:dev.tsf Time Series Computed KCRTS Command Enter the Analysis TOOLS Module 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 Command Compute Flow DURATION and Exceedence Loading Time Series File:dev.tsf Computing Interval Locations Computing Flow Durations Durations & Exceedence Probabilities to File:dev.dur 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 bypass.tsf Regional Scale Factor: 1.00 Data Type : Reduced Creating Hourly Time Series File Impervious Loading Time Series File:C:\KC SWDM\KC DATA\STEI60R.rnf 0.25 acres .' Total Area: 0.25 Peak Discharge: 0.118 CFS at acres 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 Compute Flow DURATION and Exceedence Computing Interval Locations Computing Flow Durations Loading Time Series File:bypass.tsf Durations & Exceedence Probabilities to File:bypass.dur Analysis Tools Command RETURN to Previous Menu KCRTS Command eXit KCRTS Program .' Liberty Gardens -Peak Flow Rates Flow Frequency Analysis Time Series File:forest.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.545 2 2/09/01 18:00 0.148 7 1/06/02 3:00 0.404 4 2/28/03 3:00 0.014 8 3/24/04 20:00 0.240 6 1/05/05 8:00 0.418 3 1/18/06 21:00 0.353 5 11/24/06 4:00 0.697 1 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) 1. 56 6 2/09/01 2:00 1. 27 8 1/05/02 16:00 1. 88 3 2/27/03 7:00 1. 38 7 8/26/04 2:00 1. 66 4 10/28/04 16:00 1. 65 5 1/18/06 16:00 2.00 2 10/26/06 0:00 3.15 1 1/09/08 6:00 Computed Peaks Flow Frequency Analysis Time Series File:rdoutlev3.tsf Project Location:Sea-Tac ---Annual Peak Flow Rates--- Flow Rate Rank Time of Peak (CFS) 0.475 2 2/09/01 20:00 0.103 7 1/07/02 3:00 0.396 3 3/06/03 22:00 0.085 8 8/26/04 7:00 0.105 6 1/08/05 2:00 0.159 5 1/19/06 5:00 0.263 4 11/24/06 9:00 0.683 1 1/09/08 11: 00 Computed Peaks -----Flow Frequency Analysis------- --Peaks Rank Return Prob (CFS) Period 0.697 1 100.00 0.990 0.545 2 25.00 0.960 0.418 3 10.00 0.900 0.404 4 5.00 0.800 0.353 5 3.00 0.667 0.240 6 2.00 0.500 0.148 7 1. 30 0.231 0.014 8 1.10 0.091 0.646 50.00 0.980 -----Flow Frequency Analysis------- - -Peaks Rank Return Prob (CFS) Period 3.15 1 100.00 0.990 2.00 2 25.00 0.960 1. 88 3 10.00 0.900 1. 66 4 5.00 0.800 1. 65 5 3.00 0.667 1. 56 6 2.00 0.500 1. 38 7 1. 30 0.231 1.27 8 1.10 0.091 2.77 50.00 0.980 -----Flow Frequency Analysis------- --Peaks --Rank Return Prob (CFS) (ft) Period 0.683 8.04 1 100.00 0.990 0.475 7.76 2 25.00 0.960 0.396 7.25 3 10.00 0.900 0.263 6.80 4 5.00 0.800 0.159 5.75 5 3.00 0.667 0.105 5.25 6 2.00 0.500 0.103 5.08 7 1. 30 0.231 0.085 3.38 8 1.10 0.091 0.613 8.02 50.00 0.980 .' Flow Frequency Analysis Time Series File:dsoutlev3.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 0.493 2 2/09/01 19:00 0.706 1 100.00 0.990 0.142 6 1/05/02 16:00 0.493 2 25.00 0.960 0.409 3 3/06/03 21:00 0.409 3 10.00 0.900 0.138 7 8/26/04 2:00 0.283 4 5.00 0.800 0.130 8 1/05/05 8:00 0.159 5 3.00 0.667 0.159 5 1/19/06 5:00 0.142 6 2.00 0.500 0.283 4 11/24/06 6:00 0.138 7 1. 30 0.231 0.706 1 1/09/08 11: 00 0.130 8 1.10 0.091 Computed Peaks 0.635 50.00 0.980 .. 0.8 --+--EJ<i sti ng --B --Developed 0.7 0.6 _ 0.5 til LL ~ .. ~ 0.4 or:: ~ 0 iL 0.3 0.2 0.1 0 100E-05 1.00E-04 1.00E-03 1.00E-02 1.00E-01 1.00E+00 Probability of Exceedence Flow Duration Curves for RID. Duration curves are shown at a downstream point- of-compliance to account for a small amount of bypass. The pond is designed to meet Level 3 flow control standards. , Screening Transmittal .. King County Preliminary Plat Application of Cavalla LUSD File No. L06P0001 Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton, Washington 98057-5212 Date of Information Request: May 5, 2008 Deadline for Submittal of Information: August 5, 2008 Please provide ten (10) copies of the following, unless otherwise noted. Drainage: • Please resize the drainage facility to Level III standards, the existing conceptual plan appears to show conservation flow control; • For any questions on the drainage items please contact Senior Engineer, Bruce Whittaker at 206-296- 7211. Traffic: • Please provide a revised traffic impact analysis that addresses the increased density; • Revised concurrency certificate; • Revise plans to show/meet 2007 King County Road Standards; • Please provide the walking path for the elementary school from the plat; • For any questions on the traffic items please contact Senior Engineer, Kris Langley at 206-7155. Zoning: • Provide a revised Fire District Receipt; • Provide a revised Water Certificate; • Provide a revised Sewer Certificate; • Provide a revised Density Worksheet; • Provide documentation of Transfer Development Credits; Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necessary, as a result of above-referenced requests for additional information. Please also include 3 copies of the revised site plan on a reduced 8 )1," X 14" page. As a result of the review of the information, additional information (studies, reviSions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguration and/or loss of lots. Cavalla -L06P0001 07107 King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 Alternative formats available upon request Drop-Off Cover Sheet for Land Use Services Division ******,*****************IMPORTANT*********************** PROJECT NUMBER AND NAME IS NECESSARY FOR ALL DROP-OFFS Date Received by LUSD ~-.> = = Project No_: = _,''7.1 <-~".: Project Name: '" 1"'-1 ~; FROM: TO: W£;f;rJ<L-ti ~_8arghaUSen Engineers Co pany Name I Contact Person Telephone No_ (425) 251-6222 uk iI' bb;-ks ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Short Plat I Plats Please specify item(s) dropped-off: _" 1:li!f!j:#t:t/;f:-~~pIA~ ~ Lot Line Adjustment Permit Please specify item(s) dropped-off: Right of Way Permit Please specify item(s) dropped-off: Clearing I Grading Permit Additional information requested; please specify item(s) dropped off: 0 C~ w 01 0 p'.~ eJ <'.: -0 f11 3: rr'- U'> _ 1 C} w (J1 Other: ______________________________________________________________________ ___ PLEASE N.oTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything_ Assistance in finding a project number can be provided by speaking to a Land Use Services Division Person of the Day (POD) or the Zoning/Land Use Technician. Your cooperation is important. Thank you. LUSD Drop-Off Cover Sheet Ig-cvs-dropoftpdf 05·30-2002Page 1 of 1 CIVIL ENGINEERING. LAND PLANNING. SURVEYING July 30, 2008 COURIER DELIVERY Chad Tibbits Project Program Manager II King County Department of Development and Environmental Services Current Planning Section 900 Oakesdale Avenue S,W. Renton, WA 98057-5212 RE: Resubmittal Information and Revised Plans Preliminary Plat of Cavalla King County File No. L06POOO I Our Job No. 11778 Dear Chad: 1 am enclosing the following documents for your use in processing the preliminary plat for Cavalla based on your May 5, Z008, letter/plat screening transmittal for the plat of Cavalla. I. Twenty-five (25) copies of the revised preliminary plat map (preliminary plat, preliminary road and drainage, and adjacent property owners map) dated July 23. ZOOS 2. Twenty-five (25) copies of the revised landscape plan and tree huffer plan dated July 23, 2008 3. Three (3) copies ofthc site plan reduced to 8V,-by 14-inch 4. One (1) copy of the revised King County Density Worksheet [n an effort to provide you assistance in analyzing the enclosed information, I would like to provide a brief response to each item outlined (in order) of the Plat Screening Transmittal. Drainage: • Please resize the drainage facility to Level Iff standards, the existing conceptual plan appears to show comerva/ionflow control; Response: The enclosed preliminary drainage plan has been designed to accommodate the Level 3 Flow Control as stipulated in the Technical Information Report prepared by Barghausen Consulting Engineers, Inc. (see Sheet C2). • For an)' ljUeSliofLs 011 the drainage items please contact .';enior Engineer. Bruce Whittaker at 206-296-7211. Response: Comment noted. 18215 72ND AVENUE SOUTH KENT, WA 98032 (425) 251-6222 (425) 251,8782 FAX BRANCH OFFICES • OLYMPIA, WA • TACOMA, WA • SACRAMENTO, CA • TEMECULA, CA www.barghausen.com .. Chad Tibbits Project Program Manager II King County Department of Development and Environmental Services Current Planning Section Traffic: -2-July 30. 2008 • Please provide a revised traffic impact analysis that addresses the increased density; Response: Not applicable. • Revised concurrencv certificate: Response: Not applicable. • Revise plans to show/meet 2007 King County Road Standards; Response: Not applicable. • Please provide the walking pathfor the elementary school from the plat; Response: As required by Code. a safe walking path shall be provided as needed. • For allY questions on the traffic items please contact Senior Engineer, Kris Langley at 206-7155. Response: Comment noted. Zoning: • Provide a revised Fire District Receipt; Response: Not applicable. • Provide a revised Water Certificate; Response: Not applicable. • Provide Q revised Sewer Certificate; Response: Not applicable. • Provide a revised Density Worksheet; Response: Please see the enclosed copy of the revised King County Density Worksheet as requested. • Provide documentation of Transfer Development Credits; Response: We arc not proposing Transfer Development Credits. , - Chad Tibbits Project Program Manager II King County Department of Development and Environmental Services Current Planning Section -3-July 30. 2008 In March of 2008 we resubmitted the Preliminary Plat of Cavalla, which addressed the July 26. 2007, plat screening transmittal letter. Furthermore, the resubmittal in March included a new road configuration (loop road system) and a cul-de-sac serving a total of 38 lots. However, in May of 2008 we received an additional plat screening transmittal letter requesting further information based on this 38-lot design. The May 2008 plat screening transmittal letter required us to obtain updated Certificates of Availability as well as Fire District receipt, etc. Unfortunately, after meeting with the City of Renton Public Works Department and Planning Department, we were denied the updated Certificate of Sewer Availability for 38 lots based on the City of Renton density calculation, which would only allow 33 lots. Since we were unsuccessful in obtaining an updated Certificate, we are maintaining the same road configuration but have reduced the total number of lots to 33 (to meet the City of Renton density requirements) and removed the proposed cul-de-sac. In doing so, we created a large lot (Lot No. 13) which we hopefully will further subdivide in the future once the property is annexed into the City of Renton and they revise their density calculations. Based on KCC 21A.12.060, we mect the minimum density requirements in the R-4 zone (please see attached worksheet) and furthermore. since we do not exceed the number of lots on the Oliginal application (34 lots) we do not need to obtain updated Certificates, or meet the 2007 King County Road Standards. Please note that the storm pond has been slightly modified to provide access for maintenance directly from 162nd Avenue S.E. This pond has been designed to meet the Level 3 Flow Control per the KCRTS method. I am confident that the enclosed information adequately addresses all of your concerns and comments as outlined in the Plat Screening Transmittal letter. If you have any questions or need further information, please contact me. GWP/tep 11778c.009.doc enc: As Noted Respectfully, G. Wayne Potter Senior Planner cc: Bob Ruddell, KBS Development Corporation Kolin Taylor, KBS Development Corporation Curtis Schuster, KBS Development Corporation (w/enc) Daniel K. Balmelli, Barghallsen Consulting Engineers. Inc. Ali Sadr. Barghausen Consulting Engineers, Inc. Sandy Bailey, Novastar Development Inc. · . King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98057-5212 May 5,2008 KBS III, LLC Attn. Kolin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 RE: Notice of Request for Additional Information or Studies Application No. L06P0001 -Cavalla Plat Date Filed: January 12, 2006 Date of Complete Application: February 9, 2006 Dear Mr. Taylor: The purpose of this letter is to notify you pursuant to King County Code Title 20 that the Land Use Services Division is requesting additional information and/or studies to complete the review of your project. The information is described on the enclosed plat screening transmittal. When submitting the requested information, include a copy of the plat screening transmittal and retain a copy for your records. Provide a cover letter, which lists how each item, was addressed. Any clarification or explanation of the submittal can also be included in the cover letter. Please submit the information to: King County Dept. of Development and Environmental Services Land Use Services Division ATTN.: Chad Tibbits, Project Manager II, Current Planning Section 900 Oaksdale Avenue Southwest Renton, WA 98057-5212 If the submittal is hand delivered, submit at the address above. Your application is on "hold" from the date of this notice, until the date you are advised that the additional information satisfies this request or 14 days after the date the information has been provided. You will be notified if the Division determines that the information is insufficient. Please note that the supplemental information required after vesting of a complete application shall not affect the validity of such application. The deadline for the submittal of the necessary information is May 5, 2008. In the event you feel extenuating circumstances exist, which may justify an extension of this date, you may submit such request, in writing, for consideration by this Department. Failure to meet the deadline shall be cause for the Department to cancel or deny the application. MAIN FILE COpy If possible, please submit all of the information in one package. If you have any questions, regarding the additional information or the submittal deadline, please call me at (206) 296- 7194. Cc: Barghausen Consulting Engineers Attn. G. Wayne Potter, 18215 72 nd Avenue S., Kent, WA 98032 Kim Claussen, Project/Program Manager III, Current Planning Section, LUSD w/enc Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD w/enc Kris Langley, Senior Engineer, Traffic & Engineering Section, KCDOT w/enc Application File w/enc .' .. GolI, Shirley From: Sent: To: Claussen, Kimberly Tuesday, March 18, 200812:59 PM GolI, Shirley Cc: Tibbits, Chad; Mariano, Arlene; Whittaker, Bruce; Langley, Kristen Subject: FW: DDES Public Disclosure Request fyi From: Attebery, Tim Sent: Tuesday, March 18, 2008 12:55 PM To: Dinsmore, Lisa; Claussen, Kimberly Cc: Sandin, Randy Subject: RE: DDES Public Disclosure Request Page 1 of 3 Spoke to Debi Eberle this morning. We are going to do a monthly public disclosure for these folks now, Apparently, the group changed their mind, Kim is off the hook with regards to the status reports. From: Dinsmore, Lisa Sent: Monday, March 17, 2008 1:24 PM To: Attebery, Tim; Claussen, Kimberly Cc: Sandin, Randy Subject: FW: DOES Public Disclosure Request MA.IN FILE COPY Tim -your guidance please. Kim will be on vacation from the 19th to the 31st. Thanks, Lisa From: Debi Eberle [mailto:mtcdebi@msn.comj Sent: Monday, March 17, 2008 1:21 PM To: Spohr, David Cc: Claussen, Kimberly; Attebery, Tim; Dinsmore, Lisa; Miles, Joe; Whittaker, Bruoe; Mariano, Arlene; Tibbits, Chad; Sanders, Jim; Langley, Kristen; Keller, Nicole; McMurdo, Craig; Norman, Paulette; Kara, Fatin; Warden, Stephanie; Taniguchi, Harold; highlands_neighbors@hotmail.com; mtcdebi@msn,com Subject: ODES Public Disclosure Request Dear Mr, Spohr, I am writing to you at the suggestion of Gwendolyn High, I am Debi Eberle, VP of CARE where Gwendolyn is President, Gwendolyn spoke to you on 3/10 and described the proposed alternative to our Public Disclosure Request that Mr, Attebery proposed, We declined his offer (see attached copy of that email).Yet.asyouseebelow.attheveryleast.Ms. Claussen has not been made aware that Mr, Attebery's offer was declined and that the full and official Public Disclosure Request is what we expect and for which we are still waiting, Additionally, please see the other attached copies of our outstanding and on-gOing Public Disclosure Requests. We still have not received any reply from DOT and according to our calculations; the deadline for our notification of when information will be made available for our review has now passed,f3or r request of 3/6/2008, / ( :Vd O 03/18/2008 "",_ Page 20f3 We fully understand that your plate is likely very full, but we would very much appreciate your assistance in interfacing or facilitating more effective communication of our requirements to DDES and DOT staff in regard to our outstanding and on-going Public Disclosure Requests, If you are not able to assist us, please recommend to whom we might correctly address this request for help, We would be most grateful to learn what we have failed to do to properly and effectively request public records, If you need any further information, please do not heSitate to contact us, Thank you again for all your time and assistance, Debi attached: 3/6/2008 DOT Request 3/6/2008 DDES Request 3/12/2008 Email Declining Mr, Attebery's offer 3/13/2008 DOT Request 3/13/2008 DDES Request 3/14/2008 email requesting status on 3/6/2008 DOT Request Ms, Eberle - I've been asked to provide an update on the following projects, in lieu of a public disclosure request per conversation between yourself and Tim Attebery of DDES - The following information associated with the plats of Cavalla (L06P0001) and Liberty Gardens (L04P0034) has been submitted to DDES and will be available for review by the end of next week (March 21st) L06POOOl -Revised preliminary plat map & landscape plan Revised SEPA environmental checklist Level 3 stormwater mitigation report Revised plan for 162nd Ave SE road extension L04P0034 -Level 3 Downstream drainage report Revised plan for 162nd Ave SE road extension note, the road vacation application has been appealed to the King County Council -if you have questions re this vacation please contact Nicole Keller at King County Dept, of Transportation L07SA561 -This application has been withdrawn L07P0009 -This project is currently on hold pending the submittal of additional information by the applicant, The deadline for this submittal has been extended to April 11, 2008 L05P0026 -Preliminary Plat hearing has closed and is pending with the Hearing Examiner. The file for this project is Py currently at the Hearing Examiner's office, MA.IN fILE CO Please let me know if you have further questions, I can be reached at 206-296-7167. Thank you, 03118/2008 -----Original Message----- From: Debi Eberle [mailto:mtcdebi@msn.comj Sent: Thursday, March 13, 2008 11:50 AM To: Attebery, Tim Cc: "!:tigJlla nds_ll~jghbors@hotrna i l.comStepha n ie. Wa rden"@kingcounty, gov; Miles, Joe; Dinsmore, Lisa; Tibbits, Chad; Sanders, Jim; "Bruce. Wh itta ker@kingC:9unty.govKristen.Langley"@kingcou_nly.goy Subject: ODES Public Disclosure Request To Whom it May Concern: With this email, we initiate a new series of Public Disclosure Requests. We will renew this request each week for the next sequential time period. We request all records (correspondence, emails, plans, schedules, notes of meetings and phone calls, and any other category of information) in all formats (electronic, hardcopy and all other media) created, generated or received by King County related in any way to the proposed extension of 162nd Ave SE and/or to the following DOES file numbers: L05P0026: Threadgill L06P0001: Cavalla L04P0034: Liberty Gardens L07SA561: SEATTLE REDEVELOPMENT LLC L07P0009: Heritage The period to be covered by this request shall be all inclusive thru today's date of March 13, 2008. This request is submitted by: CARE -Citizens' Alliance for a Responsible Evendell PO Box 2936 Renton WA 98056 Highla od!Lneigh bors@hotmail.com Contact: Debi Eberle -Vice President Phone: 425.226.9946 FAX: 425.226.6520 Please inform us via response to this email of the date on which these requested materials will be made available for review and copy. Also, please let us know if any further information is necessary from us. Thank You, Debi Eberle C.A.R.E. -Citizens' Alliance for a Responsible Evendell. .. doing what we can, with our neighbors, for our community ... www.highlandsneighbors.org 03118/2008 Page 3 of 3 GolI, Shirie, From: Claussen, Kimberly Sent: Thursday, March 13,20082:58 PM To: Cc: Subject: Bull, Trishah; Henoch, Lanny; GolI, Shirley Tibbits, Chad; Mariano, Arlene; Dinsmore, Lisa FW: DDES Public Disclosure Request Please see below --this has been modified and no longer a public disclosure request, we will be providing monthly updates instead -in the event this group would like to view the files, a request can be made through the records center and files should be forwarded to that section. Shirley -2 of the files have a bunch of new info that came in this week, as stated, this info should be logged in the main files by next wed/Thurs 3/19-3/20. Chad should be able to forward this info to you by Monday or Tues. The Threadgill file is currently at the Hearing Examiner'S office and not available for review at DDES - I indicated it was not currently available, but if persistent, please forward the CARE group the Examiner's office. Also road vacation appeal info requests & road variance info should be forwarded to KCDOT. -----Original Message----- From: Dinsmore, Lisa Sent: Thursday, March 13, 2008 2:51 PM To: Claussen, Kimberly Subject: RE: DDES Public Disclosure Request Kim -thanks for sending this, How do they review the files/information? Please let Lanny, Trishah and Shirley know what is going on in case anything comes up while you are gone. Thanks, Lisa -----Original Message----- From: Claussen, Kimberly Sent: Thursday, March 13, 2008 2:40 PM To: rntcdebi®msn.com Cc: Attebery, Tim; Dinsmore, Lisa; Miles, Joe; Whittaker, Bruce; Mariano, Arlene; Tibbits, Chad; Sanders, Jim; Langley, Kristen; Keller, Nicole Subject: RE: DDES Public Disclosure Request Ms. Eberle - I've been asked to provide an update on the following projects, in lieu of a public disclosure request per conversation between yourself and Tim Attebery of DDES - The following information associated with the plats of Cavalla (L06P0001) and Liberty Gardens (L04P0034) has been submitted to DDES and will be available for review by the end of next week {March 21st} L06POO.Ol -Revised preliminary plat map & landscape plan Revised SEPA environmental checklist Level 3 stormwater mitigation report Revised plan for 162nd Ave SE road extension L04P0034 -Level 3 Downstream drainage report Revised plan for 162nd Ave SE road extension note, the road vacation application has been appealed to the King County Council -if you have questions re this vacation please contact Nicole Keller at King County Dept. of Transportation L07SA561 -This application has been withdrawn L07P0009 -This project is currently information by the applicant. The extended to April 11, 2008 on hold pending the submittal of additional deadline for this submittal has been MAIN FILE COpy -.. L05P0026 -Preliminary Plat hearing The file for this project is has closed and is pending with the Hearing Examiner. currently at the Hearing Examiner's office. Please let me know if you have further questions. I can be reached at 206-296-7167. Thank you. -----Original Message----- From, Debi Eberle [mailto: mtcdebi®msn. com] Sent: Thursday, March 13, 2008 11:50 AM To: Attebery, Tim Cc: "highlands_neighbors@hotmail.comStephanie.warden ll @kingcounty,gov; Miles, Joe; Dinsmore, Lisa; Tibbits, Chad; Sanders, Jim; I1Bruce.Whittaker@kingcounty.govKristen.Langley"@kingcQunty.gov Subject: DDES Public Disclosure Request To Whom it May Concern: With this email, we initiate a new series of Public Disclosure Requests. We will renew this request each week for the next sequential time period. We request all records (correspondence, emaiis l plans, schedules, notes of meetings and phone calls, and any other category of information) in all formats (electronic, hardcopy and all other media) created t generated or received by King County related in any way to the proposed extension of 162nd Ave SE and/or to the following DDES file numbers: L05P0026, Threadgill L06POOOl, Cavalla L04P0034: Liberty Gardens L07SA561: SEATTLE REDEVELOPMENT LLC L07P0009, Heritage The period to be covered by this request shall be all inclusive thru todayt s date of March 13, 2008. This request is submitted by: CARE -Citizens t Alliance for a Responsible Evendell PO Box 2936 Renton WA 98056 Highlands_neighbors@hotmail.com Contact: Debi Eberle -Vice President Phone: 425.226.9946 FAX: 425.226.6520 Please inform us via response to this email of the date on which these requested materials will be made available for review and copy. Also , please let us know if any further information is necessary from us. Thank You, Debi Eberle C.A.R.E. -Citizens I Alliance for a Responsible Evendell ... doing what we can, with our neighbors I for our community ... www.highlandsneighbors.org 2 'J C VIL ENGINEERlr~G, LAND PLPJ-lN'NG. SiJHv'~ Y '..J(3. LN\/IHor\iv1F\JT!1.1 UTNiCFS March 11, 2008 (Courier Delivery) Chad Tibbits ProjcctiProf,'Tam Manager II Current Planning Section King County Department of Development and Environmental Services 900 Oakesdale Avenue S,W, Renton, WA 98055-1219 RE: Resubmitta1 of AddItional Information Preliminary Plat of Cavalla King County File No, L06POOO 1 Our .lob No, 11778 Dear Chad: K,C ODES Enclosed are the following documents in response to the July 26, 2007 plat screening transmittal letter for the plat of Cavalla: 1. Twenty-live copies of the revised preliminary plat map and landscaping plans prepared by Barghausen Consulting Engineers, Inc" dated February IS, 2008 2, Twenty-five copies of the revised SEPA Environmental Checklist prepared by Barghausen Consulting Engineers, Inc, 3, Eight copies of the Level 3 Recommended Stonnwater Mitigation Report prepared by Ed McCarthy, P,E, dated March 3, 2008 4, Twenty-five copies of the revised plan for 162nd Avenue S.E. road extension In an effort to assist you in your review, I am providing a brief response to each item outlined in your July 26, 2007 plat transmittal letter. Drainage: • Please resubmit the co/lceptuai 16211d Avenue S£. offsite drainage/mad plan to include an adequate shoulder on the west side, This will likely require lightlining of the existing/eatare alo11g the west side of 162nd Avenue S.£. Please also revise the drainage plan to show an existing 18-inch cross-pipe under s.E. 144th Street vs, the 15-inch cross-pipe shown on the original plan. The plan should also be revised to show a birdcage type overflow structure where the east/west drainage swale enters the 162nd Avenue S£.. right-alway. Response: The enclosed plans for 162nd Avenue S.E. have been revised to i~A<MNafl\hE G._ Y required shoulder and tightlme of the conveyance system. We have also revisba'lh~ plans to / ( "\ ,\C\ Bri/\I\C'1 OI=FICES • Ol YMrIA, VVA • TACOMA \NA • SACRAI\/E\JTO. eA • I ~M+LA'11' 18::'15 72ND AVFNuc SOUTH KENi. "NA 98032 ::125'125" -6222 (425:1 251-i37B:! I At ~' Y www,barghausen_corl LO,-, Chad Tibbits Project/Program Manager II Current Planning Section King County Department of Development and Environmental Services -2-March 11, 2008 show the correct pipe sizes along South l44th Street and provided a stub with trash rack inlet to intercept the east/west drainage swale entering l62nd Avenue S,E, • The on-site and off-site draillage plan should reflect Level 3 Flow Control (or other proposed mitigation) as suggested in the Level 3 Off-Site Analys,,' submitted, Response: The on-and off~site drainage plans are revised to reflect the Level 3 Flow Control storage. • Please provide an analysis alld estimate the compensating storage required for the existing depression north of the S.E. 140tll Street cross culvert. Response: In response to this comment, it was detennined in previous meetings with King County staff that the existing depression was constructed years ago without any approved plans or permits in an attempt to provide some detention volume for the drainage channel. Our office completed an as-built survey of the existing depression and based on the elevation of the overflow, the depression provides very minimal amount of detention volume. It was agreed with County staff that they are not as much concerned with replacing this volume as they are with improving the overall conveyance and connection of the existing drainage channel to the stonn system within South l44th Street. • Revise the conceptual drainage plan to include any compensating storage, Level 3 Fluw Control, or other revisions necessary. Response: As a result of the Level 3 stonnwater analysis completed for the proJect, significant improvements are being proposed for the project, including Level 3 detention for both the on-site facility and l62nd Street roadway improvements, tightlining of the existing channel along 162nd Street, and the provision of new structures with birdcages to more efficiently convey and connect stonnwater to the existing storm system within South 144th Street. These facilities also provide birdcages for overflow protection. We are therefore, not proposing to replace thc existing insignificant amount of storage from the existing depression. • Please revise the conceptual drainage plan to address 3: 1 length-to-width ratio for the water quality design oj' the facilities. Note that haffles cannot be used to obtain 3: 1 per Section 6.4.1.2p6. 6-73 of the KCSWDM. Response: Stonn drainage plans for the project have been revised to provide the 3.' I length-to-width ratio for the water quality design requirements of the King County, Washington Surface Water Design Manual (KCWSWDM). • Please show how the access requirements and grate requirements for the off-site 162nd Avenue SE. vault are to be met. Jf the requirements are 110t met, a drainage adjustment may be required. Chad Tibbits Pro] ectiProgram Manager II Current Planning Section King County Department of Development and Environmental Services -3-March 11, 2008 Response: We have shown that the storm drainage detention vault will be designed with a step-up lid to follow the road grade and to provide the required access; therefore, a drainage adjustment is not required. • For any questions on drainage items, please contact Senior Engineer, Bruce Whittaker at 206-296-7211. Response: Comment noted. Please note that the enclosed preliminary plat map has been revised to provide better vehicular circulation for the project site, as well as to maximize the allowable density of the 38 lots. We havc also located the required park to incorporate the existing pathway for Liberty High School. This park has been designed to be located at the intersection of Roads A and B and will adequately meet the recreational needs for this project. The storm pond has been located in the southwest comer of the site (Tract A) and has been redesigned to meet the 3:1 ratio requirements pursuant to the KCWSWDM. The access to Tract A will be via Tract B and a public access easement. We have also revised the significant tree retention and placement landscape planting plan (PL I of 3). I believe that the enelosed information adequately addresses the comments regarding drainage as outlined in the July 26, 2007 plat screening transmittal letter. Upon review of the enclosed information, please issue a SEPA Threshold Determination and schedule a preliminary plat hearing. If you have any questions or need additional information, please do not hesitate to contact me at this office. Thank you. GWP/dm 11778e.008.doc enc: As Noted Respectfully, ~fJr~S13 G. Wayne Potter Senior Planner cc: Bob Ruddell, KBS Development Corporation Kolin Taylor, KBS Development Corporation Curtis Schuster, KBS Development Corporation (w/enc) Daniel K. BalmelIi, J3arghausen Consulting Engineers, Inc. Ali Sadr, Barghausen Consulting Engineers, Inc. <® ,'. King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 Alternative formats available upon request Drop-Off Cover Sheet for Land Use Services Division ***********************IMPORTANT*********************** PROJECT NUMBER AND NAME IS NECESSARY FOR ALL DROP-OFFS Date Received by LUSD Project No_: Project Name: FROM: ~ Bar hausen En ineers Comp ny Name / Contact Person Telephone No_ (425) 251-6222 TO: CW'irU;ts ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Short Plat I Plats Please specify item(s) dropped-off: 2Scu 'e,) ~~ 2 M - Co i~J /..JUu i3 Lot Line Adl stment Permit Please specify item(s) dropped-off: Right of Way Permit Please specify item(s) dropped-off: Clearing I Grading Permit Additional information requested; please specify item(s) dropped off: ". C"J IIr III!I M V> ....., = = "'" =c """ "" ..." :x ':':> .r:- C. ~ t"r, ""', f":": ..c' rt"· • Other: __________________________________________________________________________ ___ PLEASE NOTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything. Assistance in finding a project number can be provided by speaking to a Land Use Services Division Person of the Day (POD) or the Zoning/Land Use Technician. Your cooperation is important. Thank you. LUSD Drop-Off Cover Sheet Ig-cvs-dropaff.pdf OS-3Q-2002Page 1 of 1 ","® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98057-5212 February 6, 2008 KBS III, LLC Attn. Kolin Taylor 12320 NE 8th Street, #100 Bellevue, WA 98005 RE Application for the Preliminary Plat of Cavalla DOES File No. L06P0001 Dear Mr. Taylor: • The January 17, 2008 email requesting an extension of the deadline for submittal of the additional information required to process the preliminary plat application of Cavalla has been received. The request for additional information stops all processing of the plat application until the required information is received. The time spent waiting for information to be submitted is not counted toward any time limit requirements of the plat application process. The previous letter established a deadline of January 24, 2008. We are granting an extension to this deadline. If the Land Use Services Division of DOES does not receive the necessary information requested to process your application by May 7, 2008, your application will be canceled or denied. If you have any questions regarding this matter, please call me at (206) 296-7194. Sinc~_ ) ~~",g",. Current Planning Section Cc: Barghausen Consulting Engineers, Attn. G. Wayne Potter, 18215-72nd Avenue S., Kent, WA 98032 Kim Claussen, Project/Program Manager III, Current Planning Section, LUSD Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD Kris Langley, Senior Engineer, KCDOT Application File MAIN FILE COpy ,. . Page I of I Tibbits, Chad From: Wayne Potter [wpotter@novastardev.comJ Sent: Thursday, January 17, 2008 9:58 AM To: Tibbits, Chad Cc: Bob Ruddell; Kolin Taylor; Curtis G. Schuster; David Halinen; Dan Balmelli; Sandy Bailey; File Subject: Request for extension to the re-submittal deadline for the Plat of Cavalla, King County File # L06P0001; BCE #11778 Dear Chad, Per our conversation earlier today, I am requesting on behalf of KBS Development Corporation an extension to the re-submittal deadline date of January 24, 2008 for the Preliminary Plat ofCavalla. Our request is based upon the fact that we are finalizing the level III downstream drainage analysis for the plats of Cavalla and Liberty Gardens based on comments from Bruce Whitaker. We expect that Ed McCarthy we have his information done within the next 2 to 3 weeks. Also, we are revising the plat to maximize the density (34 lots to 38 lots as allowed by code) which will require a revision to the internal road network, park location, etc. If possible, please provide me in writing and extension of 3 months to complete the plat revisions and resubmit to KC DDES. If you have any questions or need further inf'om1ation please contact me. Thank you. Respectfully, G. Wayne Potter Senior Planner Barghausen Consulting Engineers, Inc. 1821572nd Ave. South Kent, WA 98597 (206) 255-7106 (cell) (425) 656-7435 (direct) (425) 251-8782 (fax) 02/06/2008 King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98057-5212 October 24, 2007 KBS III, LLC Attn. Kolin Taylor 12320 NE 8"1 Street, #100 Bellevue, WA 98005 RE: Application for the Preliminary Plat of Cavalla DOES File No. L06P0001 Dear Mr. Taylor: • The October 23, 2007 email requesting an extension of the deadline for submittal of the additional information required to process the preliminary plat application of Cavalla has been received. The request for additional information stops all processing of the plat application until the required information is received. The time spent waiting for information to be submitted is not counted toward any time limit requirements of the plat application process. The previous letter established a deadline of October 23, 2007. We are granting an extension to this deadline. If the Land Use Services Division of DOES does not receive the necessary information requested to process your application by January 24, 200'l., your application will be canceled or denied. If you have any questions regarding this matter, please call me at (206) 296-7194. Cc: Barghausen Consulting Engineers, Attn. G. Wayne Potter, 18215-72 nd Avenue S, Kent, WA 98032 Kim Claussen, Project/Program Manager III, Current Planning Section, LUSD Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD Kris Langley, Senior Engineer, KCDOT Application File ® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 July 26, 2007 KBS III, LLC Attn, Kolin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 RE: Notice of Request for Additional Information or Studies Application No. L06P0001 -Cavalla Plat Date Filed: January 12, 2006 Date of Complete Application: February 9, 2006 Dear Mr Taylor: The purpose of this letter is to notify you pursuant to King County Code Title 20 that the Land Use Services Division is requesting additional information and/or studies to complete the review of your project. The information is described on the enclosed plat screening transmittal. When submitting the requested information, include a copy of the plat screening transmittal and retain a copy for your records. Provide a cover letter, which lists how each item, was addressed. Any clarification or explanation of the submittal can also be included in the cover letter. Please submit the information to: King County Dept. of Development and Environmental Services Land Use Services Division ATTN.: Chad Tibbits, Project Manager II, Current Planning Section 900 Oaksdale Avenue Southwest Renton, WA 98055-1219 If the submittal is hand delivered, submit at the address above. Your application is on "hold" from the date of this notice, until the date you are advised that the additional information satisfies this request or 14 days after the date the information has been provided. You will be notified if the Division determines that the information is insufficient. Please note that the supplemental information required after vesting of a complete application shall not affect the validity of such application. The deadline for the submittal of the necessary information is October 23, 2007, In the event you feel extenuating circumstances exist, which may justify an extension of this date, you may submit such request, in writing, for consideration by this Department. Failure to meet the deadline shall be cause for the Department to cancel or deny the application. · . If possible, please submit all of the information in one package. If you have any questions, regarding the additional information or the submittal deadline, please call me at (206) 296- 7194. SiO~~ Chao Tibbits, ~~gram Manager II Current Planning Section Cc: Barghausen Consulting Engineers Attn. G. Wayne Potter, 18215 72 nd Avenue S., Kent, WA 98032 Kim Claussen, Project/Program Manager III, Current Planning Section, LUSD w/enc Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD w/enc Kris Langley, Senior Engineer, Traffic & Engineering Section, KCDOT w/enc Nick Gillen, Senior Ecologist, Critical Areas Section, LUSD, w/enc Application File w/enc ·Kil1g County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale A venue Southwest Renton, Washington 98055-1219 Plat Screening Transmitta Preliminary Plat Applicatio .. of Cavalla LUSD File No. L06P0001 Date of Information Request: July 26,2007 Deadline for Submittal of Information: October 23, 2007 Please provide ten (10) copies of the following, unless otherwise noted. Drainage: • Please resubmit the conceptual 162nd Ave SE offsite drainage/road plan to include an adequate shoulder on the west side. This will likely require tightlining of the existing feature along the west side of 162nd Av SE. Please also revise the drainage plan to show an existing 18-inch cross pipe under SE 144th St vs. a 15-inch shown on the original plan. The plan should also be revised to show a birdcage type overflow structure, where the east-west drainage swale enters the 162 nd Ave SE RfW. • The onsite and offsite drainage plan should reflect Level 3 Flow Control (or other proposed mitigation) as suggested in the Level 3 Offsite Analysis submitted. • Please provide an analysis and estimate of compensating storage required for the existing depression north of the SE 144th ST cross culvert. • Revise the conceptual drainage plan to include any compensating storage, Level 3 Flow Control or other revisions necessary. • Please revise the conceptual drainage plan to address 3:1 length to width ratio for the water quality design of the facilities. Note that baffles cannot be used to obtain 3:1 per Section 6.4.1.2 p6. 6-73 of the KCSWDM. • Please show how the access requirements and grate requirements for the offsite 1620d Ave SE Vault are to be met. If the requirements are not met, a drainage adjustment may be required. • For any questions on the drainage items please contact Senior Engineer, Bruce Whittaker at 206-296- 7211. Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necessary, as a result of above-referenced requests for additional information. Please also include 3 copies of the revised site plan on a reduced 8 )1," X 14" page. As a result of the review of the information, addilional information (studies, revisions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguration and/or loss of lois. Cavalla -L06P0001 07107 , PRIVATE AGREEMENT 162 00 Ave SE Extension to SE 144<10 ST. and SE 136111 ST Intersection at 156" Ave SE KBS, Rabul B. and Arvind J. Petrie & Eagle Creek Land & Development The following agreement is entered into between Rabul B. and Arvind J. Petrie, as individuals ["Petrie"], KBS Development Corporation, a Washington Corporation ["KBS"], and Eagle Creek Land & Development, LLC, a Washington limited liability company ["Eagle Creek"], and collectively with Petrie, KBS and Eagle Creek "Developers"] as of May 10,2007. I. PropertjeslPurnose. A. Petrie is the owner of that real property described in Exhibit A ["Liberty Gardens"]. B. KBS is the contract owner of that real property described in Exhibit B ["Cavalla"]. C. Eagle Creek is the contract owner of that real property described in Exhibit C ["Threadgill"]. D. The Developers have applications for residential subdivisions submitted to the King County Department of Development and Environmental Services ["King County"] for each of the above properties ["Properties"], and have already been or will be required to provide certain mitigation for their Properties impacts on the surrounding road improvements as part of the King County environmental review process. The purpose of this agreement is to develop a mechanism for collectively providing the required or agreed upon mitigation improvements and allocating the costs related thereto. 2. Acting Commjttee. Each Developer shall appoint one represenmtive to a committee to act on ~: of the Developers ["Acting Committee"] and the Acting Committee shall act by mijejriiY vote to detennine aU matters to be done under this Agreement 3. Road ImprOVements and Mitigation. To comply with the required SEPAmitigation and or agreed upon road improvements that may be required by King County for the intersection at SE 136111 St and 156'" Ave SE as well as the extension of 162"" Ave Se beginning at the SW comer of Liberty Gardens continuing South until SE 144'" St, the Developers shall cooperatively '-, . • design. pennit, and installlhe improvements approved by the County, and shall jointly provide the funds required for such costs, which may include but shall not be limited to lhe cost of the following ["Mitigation Costs"): 162 Aye SE Extension and SE 136!h St and 156'" Ave SE Intersection J. ROW Improvements; 2. Stonn water detention; 3. Landscape mitigation; 4. Engineering design and jurisdiction review fees; 5. Financial gnarantee and insurance premiums; 6. Design work and s1udies by professional consultants; 7. Legal fees. 8. Additional improvements required by King County or City of Renton during the design review andlor construction process. 9. Removal andlor relocation of power or light poles. 10. Signalization if deemed necessary. II. Channelization. 4. Alternative Design. In the event an alternative design can be approved by WSDOT and King County at a lesser cost, all parties agree to pursue the alternative and share in the costs for this action based on the pro-rata share methodology as defined below. 5. Pro-rata Contributions. Each Developer agrees to fund a pro rata portion of the Mitigation Costs, as such costs become due, based on the number ofunilS created from each Developer's Property as those lots to the total of such lots for all Properties. Currently, the lots are agreed to be as follows for each Property: Liberty Gardens: Cavalla: Threadgill: 37 Units 34 Units 15 Units Based on the agreed number of units above, the following percentage of the Mitigation Costs ["Mitigation Cost Percentages"] shall apply to the Properties: Liberty Gardens: Cavalla: Threadgill: 6. Revision to Percentages. 43% 40% 17% By executing this Agreement, the Developers agree to lhe above percentages for the Properties. However, it is also agreed by the Developers that the number of such Page 2 of 12 Initial ~ ~ Qp ~ ~ r,,/C/o1'/iyo1 4IlS,o, \{\\fr1 (,,~, 01 percentages per Property shall be recalculated upon: til upon any new properly becoming subject to the same or similar mitigation requirements as for the Properties as part of such new properly's SEPA review by King County and the owner/developer/applicant becoming a party to this Agreement The recalculation of Mitigation Cost Percentages at the above times shall use the same methodology as above, and any changes shall result in a recalculation and adjustment among the Developers of Mitigation Costs previously paid [with amounts owing among the Developers to be paid within one month] and shall apply to those costs accrued after the date of such review and adjustment Provided, however, in the event that the number of units for any Property faIls below the threshold to be subject to mitigation requirements by King County: [iJ the units for that Property shall not be considered in the total units for determining the applicable Mitigation Cost Percentages accruing after such review date; and [ii 1 the units for that Property shall be utilized on a one-time basis to calculate an adjustment among the Developers for previously accrued Mitigation Costs; and [iii] the Developer of that Property shall not be subject to the terms of this Agreement with respect to that Property after such review date other than for any adjustment of Mitigation Costs previously paid or due prior to such review date as a result of an adjustment of the percentages. 7. Reimbursement of MjtiKAtion Costs Throughout the ROW improvements design, review, and construction process, it is anticipated that Mitigation Costs will occur and be borne by one Developer. The Developers agree that invoices for all such work will be submitted to the other Developers for a pro rata reimbursement based on the Mitigation Cost Percentages. Payment shall be due within one month of receipt of the invoice, unless another timeline is agreed upon by all parties in writing. All invoices shall be sent to the Managing Developer and checks will be disbursed at a monthly committee meeting 8. Disputes over Reimbursement of Exnenses. In the event that a dispute arises over the expense reimbursement provided for in Paragraph 8, the party or parties disputing the reimbursement amount shall provide the party or parties requesting the reimbursement amount written notice stating the basis for the dispute. The parties will then have 30 days to resolve the dispute. If the dispute is not resolved during that time, the parties agree to arbitrate that dispute through the Judicial Arbitration and Mediation Service in Seattle, Washington or a similar service that is agreeable to the parties. The arbitration shall be set within 30 days of the deadline for informal resolution of the dispute. The substantially prevailing party or parties shall be entitled to an award of attorneys' fees and costs as set forth in Paragraph 17. 9. Future Latecomers Agreement. King County currently has adopted road latecomers process (RCW Cb. 35.72. The Developers agree to pursue the adoption of a road latecomers ordinance with King County and/or city of Renton. Ifsuccessful and reimbursement is collected from nther benefited property owners, it is agreed to by all parties that reimbursement shall occur based on the Mitigation Cost Percentages at the time of the reimbursement Page 3 of 12 Initial ~ ~Qp \~~l/\ Jill( "N7 ¥1S{O't 611$/0/ ~.(O. ,{f-01 10. Contractor to Construct Improvements. The parties acknowledge that the intersection improvements will most likely occur during the spring/summer of 2008. It is also probable that all projects will have received conslruCtioo approval by this time. The parties agree that Requests for Proposals for the construction of the mitigation improvements will be sent to a minimum of three pre-qualified contractors for cost comparison. The selected contractor shall be approved by all parties prior to beginning work on the project. Management of the contractor will be determined by agreement of the Developers prior to construction including pro-rata reimbursement of management expenses accrued by the managing Developer. Anticipated cost over runs and/or change orders greater than $10,000 shall be approved by the Developers prior to approval for payment. II. Time is of the Essence. Time shall be of the essence in performing all acts required by this Agreement. 12. Authority. The Parties each represent and warrant that they have full power and actual authority to enter into this Agreement and to carry out all actions required of them by this Agreement. All persons executing this Agreement in representative capacities represent and warrant that they have full power and authority. 13. Notices. All notices, requests, demands and other ccmmunications called for or contemplated by this Agreement shall be in writing, and shall be deemed to have been duly given by mailing the same by first-class mail, postage prepaid; by delivering the same by hand; or by sending the same by telex or telecopy or email, to the following addresses, or to such other addresses as the parties may designate by written notice in the manner aforesaid, provided that communications that are mailed shall not be deemed to have been given until three business days after mailing: Raltul B. and Arvind J. Petrie clo Dave Petrie 811 Sooth 273M Ct Des Moines, W A 98198 KBS Devel0.rment Corporadon 12320 NE 8 Street #100 Bellevue, W A 98005 Eagle Creek Land & Development, LLC 13701 SE 253rd St Kent, W A 98042 Page 4 of 12. hutial ~CRL <lL ~ r.lr{tn b(~/cr tilt"" Ij \~ C 1 14. Goyerning Law. This Agreement is entered into under the laws of the state of Washington, and if it becomes necessary to interpret or enforce any of its terms, it is the intent of all parties that the laws of the State of Washington shall apply. 15. Consent to Jurisdiction and Venue. All parties shall submit and not object to jurisdiction and venue in the King County Superior Court, State of Washington. in connection with any claims arising out of this Agreement. 16. Binding Effect: Assignabilitv. This Agreement shall bind and inure to the benefit of the parties hereto and their respective heirs, legatees, representatives, receivers, trustees, successors, transferees and assigns. 17. Attorneys' Fees. Should it be necessary for any party to this Agreement to initiate legal proceedings to adjudicate any issues arising hereunder, the party or parties to such legal proceedings who substantially prevail shall be entitled to reimbursement of their attorneys' fees, costs, expenses and disbursements (including the fees and expenses of expert and fact witnesses, whether or not they testify in any proceeding) reasonably incurred or made by the substantially prevailing parties in preparing to bring suit, during suit, on appeal, on petition for review, and in enforcing any judgment or award, from the other party or parties. 18. Severabili ty. This Agreement does not violate any federal or state statute, rule, regulation or common law known; but any provision which is found to be invalid or in violation of any statute, ru Ie, regulation or common law shall be considered null and void, with the remaining provisions remaining viable and in effect. 19. Cooperation in Execution of Documents. The parties agree properly and promptly to execute and deliver any and all additional documents that may be necessary to render this Agreement andlor the documents executed pursuant to the Exhibits attached hereto legally and practically effective. This paragraph shall not require the execution of any document that expands, alters or in any way changes the terms of this Agreement 20. Headings Not Controllinll. The paragraph headings included herein are for reference only and are not a part of this Agreement. The headings shall not control or alter the meaning of this Agreement as set forth in the text. 21. CoWJtetpartJ;. This Agreement may be executed in any number of identical counterparts, notwirhstanding that all parties have not signed the same counterpart, with the same effect as if all parties had signed the same document All counterparts shall be construed as and shall constitute one and the same agreement. 22. Equal Opportunity to Participate in Draftini- The parties have participated and had IlI1 equal opportunity to participate in the drafting of this Agreement. No ambiguity shall be construed against any party based upon a claim that that party drafted the ambiguous language. 23. Incorporation ofExhibjts. Any exhibits referred to in this Agreement are incorporated herein by this reference as if fully set forth here. 24. Waiver. Any ofthe terms or conditions of this Agreement may be waived, but only by a written notice signed by the party waiving such terms or conditions. A waiver or any breach of, or failure to enforce, any of the terms or conditions of this Agreement shall not in any way affect, limit or waive a party's rights to enforce compliance thereafter with each and every term and condition of this Agreement. 25. S@M' of Limitations. t All claims or causes of action arising out of this Agreement must be brought within one year after they accrue. Failure to bring suit within this time period shall be a complete bar to any such claims Or causes ofaetion. 26. Final and Complete Agreement. This Agreement together with any exhibits attached hereto constitutes the final and complete expression of the parties on all subjects. This Agreement may not be modified, interpreted, amended, waived or revoked except in writing signed by all parties. This Agreement supersedes and replaces all prior agreements, discussions and representations on all subjects including without limitation. No party is entering into this Agreement in reliance on any oral or written promises, inducements, representations, understandings, interpretations or agreements other than those contained in this Agreement and the exhibits hereto. 27. Full Understanding: Independent Legal Counsel. The parties each acknowledge, represent and agree that they have read this Agreement and the Exhibits attached; that they fully understand the terms thereof; that they have been fully advised by their legal counsel, accountants and other advisors with respect thereto; and that they are executed by them upon the advice and recommendation of their independent legal counsel EXECUTED AND EFFECTIVE the date fITSt above written. IN WITNESS WHEREOF, the parties bereto have entered into this Agreement effective as of the last date first set forth below. Rahul B. Petrie I Date 6/15/<:>7 Date Date Date I Goodwin, Managln ember Eagle Creek Land & Development, LLC Page 7 of 12 Initial ~ tL [JL f:N'l /(1f,M-C/~/'" Exhibit A Liberty Gardens Property Legal destription Tracts 5 and 6, Block 4, Cedar Park Five Acre Tracts, according to the Plat thereof recorded in Volume 15 of Plats, page 91, records of King County. Otherwise known as Tax Lots 145750-0145 and 145750-0150,4.16 acres band 4.5 acres at South 164th Ave S.B. and S. E. 142nd Street between Renton and Issaquab. Situate in County of King, State of Washington. Page 8 of 12 Initial &! fl. ,~_ bC:~;"/ Wtr7 Parcel No. 14575-0135 (Nguyen) Exbibit B Cavalla Property Legal description Tract 3, Block 4, Cedar Park 5-acre tracts, according to the plat thereof recorded in Volume 15 of Plats, page 91, Records of King County, Washington. Situate in King County, Wasbington. Parcel No. 145750-0140 (Miya) Tract 4, Block 4, Cedar Park 5-acre tracts according to the plat thereof recorded in Volume 15 of Plats, page 91, Records of King County, Washington. TOGETHER WITH that portion of the East 30 feet of the South 658.23 feet of the North 687.48 feet of the Southeast quarter of Section 14, Township 23 North, Range 5 East, W.M., as vacated by King County Ordinance No. 4406 recorded under Recording No. 7908150748 adjoining said premises. EIhibit C TbreadgiU Property Legal descriptiOD TRACT S, BWCK I, CEDAR PARK FIVE ACRE TRACTS, ACCORDING TO THE PLATS THEREOF RECORDED IN VOLUME 15 OF PLATS, PAGE 91, RECORDS OF KING COUNTY, WASHINGTON. Tax I.D. Dumber: 145750-0040 Page 10 of 12 , . 1 Initial g.a.J. ~ O~ ~ ~ !T!t;., .. , , .. ~,,-v 1 ~ ;, '''It'O\ STATEOFWASHINGTON ) ) ss. COUNTY OF KING ) I certify that I know or have satisfactory evidence that Rahul B. and Arvind J. Petrie are the persons who appeared before me, and said persons acknowledged that they signed this instrument, on oath stated that they were authorized to execute the instrument for the uses and purposes mentioned in the in~ment ,2007. ¥~~ (Print Name)M'"' Residing at .1&s a My appointment expires: I t:r) I I \ STATEOFWASIllNGTON ) ) ss. COUN1Y OF KING ) I certify that I know or have satisfactory evidence that Randall Goodwin is the person who appeared before me, and said person acknowledged that he signed this instrument, on oath stated that he was authorized to execute the instrument and acknowledged it as the act of Eagle Creek Land & Development, LLC aWasbington limited liability company, for the uses and purposes mentioned in the instrument DATED this £L day of Tu /11.( ,2007. (print Resiilingat~~~ ____ ~~~~+-- My appointment expires: .....L,L.lj..rc:,~....L- 1a-/o:;J. STATE OF WASHINGTON ) ) ss. COUN1Y OF KING ) Page II ofl2 I certify that I know or have satisfactory evidence that Kolin B. Taylor is the person who appeared before me, and said person acknowledged that he signed this instrument, on oath stated that he was authorized to execute the instrument and acknowledged it as the act ofKBS Development Corporation, a Washington corporation, to be the free and voluntary act and deed of such corporation for the uses and purposes mentioned in the instrument DATEDthis ~L1JaYOf --:lUI..!! ",,\\~~\llll", STATEOFWASHINGTON ) ) ss. COUNTY OF KING ) ,2007. (Print Name) Cor.f; . S, I.,. ",' Residing at J:<;:-r</:"U/,{; My appointment expires: fr ,31-' ..... '1 I certify that I know or have satisfactory evidence that Robert W. RoddeIl is the person who appeared before me, and said person acknowledged that he signed this instrument, on oath stated that he was authorized to execute the instrument and acknowledged it as the act of KBS Development Corporation, a Washington corporation, to be the free and voluntary act and deed of such corporation for the uses and purposes mentioned in the instrument DATED this I ~M'day of JUf'/2 ,2007. """\\\\'11 Page 12ofl2 , CIVIL ::~JGINE::Rlt·JG. LAND PLANNING. SURV::v NG. cNVIHONr,/1cN IAL ~ERVICES Mr. Chad TibbllS, Project Manager II King County Department of Development and Environmental Services Current Planning Section 900 Oakesdale Avenue S.W. Renton, \VA 98055-1219 RE: AJdlllonal Inlommtion for Plat of Cavalla Kmg County File No. L061'000 I Our Job ~o. 11778 Dear M1'. Tibbits: July 3, 2007 COURIER DELIVERY iRi ~ (C [f£ C \(- JUL II 2 2007 J(.C. O.O.E.S. J am enciosll1g the followmg information in response to your AprilS, 2007. plat screening transmittal letter. l. Ten (10) copies of the S.F.. 144th Street Level 3 Downstream Drainage Analysis for the Plats ofCavalla. Threadgill. and Lrberty Gardens prepared by Ed McCarthy dated June 15,2007 2. len (l1J) eoplCS of the traffic and road information prepared by D.N. Tranic Consultants addrc"mg lmlllc iSsues raised at the February 28, 2007 meeting by Senior Engineer Chris Langley Ten (10) copies of the Cavalia, Lrberty Gardens. and 162nd Avenue S.E. road extension mitigation plan prepared by Chad Armour, LLC dated May 17.2007 4. Ten (10) copies of the executed private agreement between the developers of Lrberty Gardens, Cavalla, and Threadgill with respect to 162nd Avenue S.E. extension and S.E. 144th Street and S.E. 13(,th Street intersections dated June 18.2007 5. Twenty-five (25) copies of the revised extension plans for 162nd Avenue S.E. dated October 23,2006 At the February n, Z007. meetll1g, the developers of Threadgill, Cavalla. and Liberty Gardens met with KCDDES staff to diSCUSS the cumulative impacts to traffic, storm, and entical areas. The enclosed information adequately addresses the plat screening comments dated AprilS, 20()]. If you need additronal information, please contact me. C;WI',dm!tep 1177~c.007.doe enc: As :\:oted cc Mr. Bob Ruddell. KBS III, LLC Me. Kahn Taylor. KflS III, LLC Mr. CurtiS Schuster, KBS Development Corp. (w/ene) Mr. Daniel K. Ba1melii, flarghausen Consulting Engll1eers. Inc. 'vIr. Air Sadr, Barghausen Consulting Engineers. Inc. MAIN FILE C~py 18?15 nND AVENUE SOUTH KE"NT. WA 98032 (425) 251-6222 (425) 251-8782 FAX Z ~ BRANCH OFFICES • OLYMPIA. WA • TACOMA, WA • SACRAMENTO, CA • TEMECULA. C ~/ / www.barghausen.colTl . CJ~ ~ /J King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton, Washington 98055-1219 (206) 296-6600 Alternative formats available upon request Drop-Off Cover Sheet for Land Use Services Division ***********************IMPORTANT*********************** PROJECT NUMBER AND NAME IS NECESSARY FOR ALL DROP-OFFS Project No.: Project Name: -.JO'-..;.ki!QC.l.-'tZ~tCl.-{""a.~ ________ _ FROM: W4-t~!1d-w ,Barghausen Engineers ,I Company Name I Contact Person I Telephone No. (425) 251-6222 Date Received by LUSD /R1 lE (C fE II W ~ rRI JUL 0 2 2007 10 K.C. D.O.E.S. T~: ClM 6Jbhi12 /ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Short Plat I Plats Please specify item(s) droPEed-off: 10 cnfle:;, Levu.3 :tJow1J.s.hw1h ... -Ilg-fb14t= /OCoPles e(i.(',,~ f¥,K..~ Lot Line Adjustment Permit Please specify item(s) dropped-off: . Right of Way Permit Please specify item(s) dropped-off: Clearing I Grading Permit Additional information requested; please specify item(s) dropped off: Other: ______________________________________________________________________ _ PLEASE NOTE: All drop-off item(s) will be logged into the computer under the project number, therefore, it is important that the top portion of this form is completed properly before you drop-off anything. Assistance in finding a project number can be provided by speaking to a Land Use Services Division Person of the Day (POD) or the Zoning/Land Use Technician. Your cooperation is important. Thank you. LUSD Drop-Off Cover Sheet Ig-cvs-dropoff.pdf 05-30-2002Page 1 of 1 1 IN [raffie Consultants/ PO Box 547 Preston, WA 98050-0547 425-392-1308 Date: To: From: Subject: April 17, 2007 Ty Pendergraft Eagle Creek Land Development Gary A. Norris, P.E., I'.T.O.E. ON Traffie Consultants ThreadgilliCa valla/Liberty Gardens Response to KC Traffic Comment This memorandum was prepared to address a question raised by Kris Langley KCDOT, at the February meeting of the Threadgill et al applicants with King County DOES. Specifically. Kris requested an evaluation of the following: I f signalization were warranted at the IS6 th Avenue SE/SE 136'" Street intersection would: I. Would some of the southbound traffic demand shift from the l62nd Avenue SE/SE 144th Streeti1S6,h Avenue SE!SR 169 route to the SE 136'h StreetllS6th Avenue SE/SR 169 route') 2. What is your prolessional opinion about the reduction along 162 nd Avenue SE and the increase along SE 136'h Street, if any? To address these questions, I will respond in the order they are presented. S ignalizat ion First, the questions are based on the premise that signalization would be warranted. A review of the prevailing traffic volumes and the MUTeD traffic signal warrants indicate the intersection does not meet applicablc warrants in the 200g with project volume scenario. Warrants considered included Warrant I -Eight Hour Warrant, Condition A and B; Warrant 2 -Four-Hour Vehicular Volnme; Warrant 3 -Peak Hour; and Warrant 7 -Crash Experience. (There have been no accidents during the latest three year period evaluated). Projecting the 200g with project volumes at the current growth rate (6 percent per year), signal warrants would be met in 17 years Or approximately 2025. Unless, the County is willing to consider signalization without warrants, it is unlikely that a signal will be constructed 1I1 the time frame of this development proposal. !: " \ ~ :~ ~ :', "J' 'I-~ i, n\ w . -_. I I I : r(i -',-:t -O· "[ "1.007 :~~" I h,;c MAIN FILE COpy Southbound Traffic Shift [f the SE 136 th Street/l 56"h A venue SE intersection were signalized, it appcars that the anticipated delay for eastbound and westbound traffic will be significantly higher than it currently is under thc two-way stop scenario. As presented in the TIA (Technical Appendix), the approach delay for the eastbound and westbound traffic under the two- way stop control is 125.9 seconds and 63.9 seconds respectively. With signalization this increases to 401.4 seconds and 241.4 seconds respectively. This condition results Irom an optimized signal timing which seeks to minimize overall intersection delay. Since the eastbound and westbound PM peak hour volumes arc insignilicant, 36 and 20 vph respectively, compared to the north and south bound traffic, 415 and 949 vph respcctively, Syncro seeks to minimize the delay by providing more "green time" to the north-south movement while the east -west movements wait. Therefore, if the signal were to operate in an optimized manner significant delay would be realized on SE l36th Street which would compel the motorist to seek other routes. An evaluation orthe travel time via both routes indicates under nonnal circumstances, where the delay realized at the SE 136 th Streetll56!h Avenue SE intersection didn't have such an impact on route selection, the plat of Threadgill would select the SE 136 th Strect!l56th Avenue SE route to SR 169 whereas the other two plats, Liberty Gardens and Cavalla would select IC,2o d Avenue SE. This is based on the assumption that the motorist will select the minimum travel time path. Obviously, human nature doesn't always work that way. If the extension of 162 0d Avenue SE is not constructed, then the SE 136 th Streetl156 th Avenue SE route has the faster travel time lor all three plats and it is assumed. Professional Opinion Regarding Diversion Based on the t(Hegoing analysis and previous analysis oftrattic flow patterns in this arca, it IS my opinion that tramc from these plats bound to/from the south and SR 169, will always seck alternative routes to the 156 th Avenue SE/SE 136 th Street route becanse of the delay encountered at this intersection. The construction of [62'''' A venue SE will not change this conclusion although it will offer a laster travel tiille tor Cavalla and Liberty Gardens. The plat of Threadgill will not benefit from the construction of 162"d Avenue SE other than through the provision of another alternative route. 1 hope this addresses the question in a satisfactory manner. If yon have any questions, please call me at (425)765-572 [ or bye-mail at gary.norris@comcast.nct. Thanks, Gary 2 (6~3) 676- (64) 378, (1) 17 ---.J (891) 863- (16) 63, ltr "'~ L ~~ 1 j l -(633) 419 (6) 2~ ---.J (190) 65J- Sf: ! 28th Street '" '" "'", .~~ EB.§: j t l (11) 13 ---.J (1) 1_ (20) 22, (3) 4 ---.J (3) 4- (12) 11, L(7) 7 -(0) 1 ,(3) 6 I t r "' '" "-~"'~ ~"'~ "'~o ~"'~ ",-.e ltr (xxx) -AM PEAK XXX -PM PEAK ON TRAFFIC CONSULTANTS w w '" w '" V> W • , • • '" c , , • • c c > • • , « > > c « « • > £ £ W ;; "' " w '" :" :; '" • m £ :" :" ;;; • , SE 1.32nd Street , c :" c • • > > "' "' £ ;; ;;; '" :" :" SE 134th Street SE 136th Street Cavalla Liberty Gardens SE 144th Street 2008 TRAFFIC VOLUMES WIO PROJECT PLAT OF THREADGILL CAVALLA LIBERTY GARDENS FIGURE 6 (~) 10 -l Sf 128th Street 117%1 L (8) 6 ; L(6H -_ (8) 6 l. (32) 21 (XXX) -AM PEAl< XXX -PM PEAK r (~) 10 t w (~) (8) d .(2) 8 r w '" u , 0 u > " £ 0 ~ ~J (2) 2- (2) d 2"'J ~"e ? (7) w '" • , 0 • > " :; ~ SE 132n d Street ~~€ SE 134th Street 21 ~-2Threadgill (46) .....ill. w V> • , 0 ~ " ~ ;; ~ -(1) 3 117%1 w '" • , 0 • > " w £ '" • m , ~ 0 • > " £ ~ ~ V (17) SE lJ6th Street ~~J ~~~ THREADGILL CAVAlLA UBERTY GARDENS w '" Cavalla Liberty Gardens SE 144ih Street AM PEAK PM PEAK TOTAL OUT IN TOTAL OUT IN 10 3 7 14 9 5 26 7 19 34 21 13 29 8 21 38 24 14 DN TRAFFIC CONSULTANTS PROJECT GENERATED TRAFFIC PLAT OF THREADGILL CAVALLA LIBERTY GARDENS FIGURE 7 (686) 647- (64) 378, "' '" .:~ E§,a: J ~ l (11) 13 ~ (1) 1- (20) 22, .... -(416) 749 • (151) 484 SE 128th Street L (15) 13 -(0) 1 .(3) 6 1 t r ~~~ -"'-",_0 --~-=-e ....... IDc::::i L <O'~"' (15) 4 --'-"'-" ~ (12) 9 J ~ l .(35) 22 (3H~ It r (3) 4- (12) 11, (XXX) -AM PEAK XXX -PM PEAK (1) 17 ~ ~ t r (891) 863 -I (20) 73, w "' w • "' , 0 • • > , <{ 0 • > £ <{ 0 ~ :;> <0'_ L .::..::. (0) 1 J l -(634) m (6) 24 ~ (192) 655- w en • , 0 • > <{ ~ w .-V> '" • , w "' • , 0 ~ <{ w £ en • m , '" 0 ;;; !" SE 132nd Street ~ • > W if> • , • > « SE 134th Street -< <{ ~ £ 00 ~ '" '" SE 1,36th Street Cavalla Liberty Gardens SE 144th Street DN TRAFFIC CONSULTANTS 2008 TRAFFIC VOLUMES WITH PROJECT FIGURE 8 PLAT OF THREADGILL CAVALLA LIBERTY GARDENS '" '" i I j ! ~ !! .1 ! I /1 i !! I I '! I I I I i ! J ! I I i .1 ' i il l ' . , i : I j ! \, i ! H'-, ,', ,: I .. ' : FIe--t--l ' - l I iii ~ I I ~ '" .... I ,. I < m v-(- ~ ~ j 'l .~ I !I :i I i Ii 1['1 (~ ;1 I ! ~ m V> m , I : I .' , I ~ I / l \ ~ ! 1 : j--\-'" I-I i \. ~ j : I I I: : \ : \ \ i '1"1 : :, \ i l I : ' I I I I ; I 1 :: I ! I '; i \ " I ~ I , , I : I I : I , \ \ I ! I ! I I I I , , , , 1] i I , , , , : I I I I ® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-121 9 April 5, 2007 KBS III, LLC Attn. Kolin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 RE: Notice of Request for Additional Information or Studies Application No. L06P0001 -Cavalla Plat Date Filed: January 12, 2006 Date of Complete Application: February 9, 2006 Dear Mr. Taylor: The purpose of this letter is to notify you pursuant to King County Code Title 20 that the Land Use Services Division is requesting additional information and/or studies to complete the review of your project. The information is described on the enclosed plat screening transmittal. When submitting the requested information, include a copy of the plat screening transmittal and retain a copy for your records. Provide a cover letter, which lists how each item, was addressed. Any clarification or explanation of the submittal can also be included in the cover letter. Please submit the information to: King County Dept. of Development and Environmental Services Land Use Services Division ATTN.: Chad Tibbits, Project Manager II, Current Planning Section 900 Oaksdale Avenue Southwest Renton, WA 98055-1219 If the submittal is hand delivered, submit at the address above. Your application is on "hold" from the date of this notice, until the date you are advised that the additional information satisfies this request or 14 days after the date the information has been provided. You will be notified if the Division determines that the information is insufficient. Please note that the supplemental information required after vesting of a complete application shall not affect the validity of such application. The deadline for the submittal of the necessary information is July 5, 2007. In the event you feel extenuating circumstances exist, which may justify an extension of this date, you may submit such request, in writing, for consideration by this Department. Failure to meet the deadline shall be cause for the Department to cancel or deny the application. MAIN FILE copy • If possible, please submit all of the information in one package. If you have any questions, regarding the additional information or the submittal deadline, please call me at (206) 296- 7194. Sincerely/:? ----J /~J~ l . Chad TibbitVl-ojectiProgram Manager" Current Planning Section Cc: Barghausen Consulting Engineers Attn. G. Wayne Potter, 18215 72,d Avenue S., Kent, WA 98032 Kim Claussen, Project/Program Manager II I, Current Planning Section, LUSD w/enc Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD w/enc Kris Langley, Senior Engineer, Traffic & Engineering Section, KCDOT w/enc Nick Gillen, Senior Ecologist, Critical Areas Section, LUSD, w/enc Application File w/enc King County Department of Development and environmental Servicc~ Land lJ:;,e Services Division 900 Oakesdale A venue Southwest Rentlm, Washington 98055-1219 lat Screening Transmittal • t"reliminary Plat Application of Cavalla LUSD File No. L06P0001 Date of Information Request: April 5, 2007 Deadline for Submittal of Information: July 5, 2007 Please provide ten (10) copies of the following, unless otherwise noted. Drainage: • Please provide the drainage information as requested at the meeting held on February 28,2007. For any questions on the drainage items please contact Senior Engineer, Bruce Whittaker at 206-296- 7211. Traffic/Roads: • Please provide the traffic and road information as requested at the technical screening meeting held on February 28, 2007. For any questions on the traffic items please contact Senior Engineer, Kris Langley at 206_296-7155. Critical Areas: • Please provide the critical areas information as requested at the technical screening meeting held on February 28,2007. For any questions on the critical areas items please contact Senior Ecologist, Nick Gillen at 206-296-7141. Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necessary, as a result of above-referenced requests for additional information. This letter will be used merely to establish a deadline for submitting the information requested at the meeting on February 28, 2007, as there are no new items that have been identified at this time. As a result of the review of the information, additional information (studies, revisions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguration and/or loss of lots. Cavalla -L06P0001 05/06 .- REVISED FIRE ENGINEERING CONDITIONS CA VALLA 34 -LOT SUBDIVISION Permit Approval Conditions Document Fire System Review Tracking Number: L06POOOI 1129/07 i\"AiN FILE COpy The following conditions apply to the Fire Engineering approval of the above referenced preliminary plat: AA02 MUDD Any questions regarding the fire review of this plan should be directed to: Bill Mudd, Fire Engineering Supervisor Telephone: (206) 296-6785. *** SPRINKLER REQUIREMENT *** All future residences constructed within this subdivision (except those constructed on lots 1 and 2) are required to be sprinkled NFPA 13D unless the requirement is removed by the King County Fire Marshal or hislher designee. The Fire Code requires all portions of the exterior walls of structures to be within 150 feet (as a person would walk via an approved route around the building) from a minimum 20-foot wide, unobstructed driving surface. To qualify for removal of the sprinkler requirement driving surfaces between curbs must be a minimum of28 feet in width when parking is allowed on one side of the roadway, and at least 36 feet in width when parking is permitted on both sides. No on-street parking will be permitted in the cul-de-sac. Additionally. the driving surface of Tracts C, E, F, G, H, J and K have to have minimum unobstructed widths of20 feet (no parking permitted); or lots access via those tracts (lots 7,8,11,12,14, 15, 18, 18 ,21, 22, 25, 25 and 30 through 34) will have to be sprinkled. FHOI FIRE HYDRANT WATERMAIN PERMITS A separate permit is required for the installation of water mains and/or fire hydrants. Submit three (3) copies of drawings and specifications to DOES Building Services Division Permit Service Center for a permit application. Review and approval by Fire Engineering Section is required prior to installation. Plans shall include, but are not limited to; pipe sizes, pipe type, valves/fittings, thrust blocks and/or rodding and material listings. Fire hydrants shall be installed per K.C.C. Title 17 Water mains shall be installed and tested per A WW A standards and/or NFPA#24 (STANDARDS FOR PRlV ATE FIRE HYDRANTS AND WATERMAINS); as applicable. Ref. 1001.4 UFC NOTE: UNLESS SPECIFICALLY NOTED, ANY WATERMAIN OR FIRE HYDRANT DETAILS ON BUILDING PLANSIDRA WINGS HAVE NOT BEEN REVIEWED OR APPROVED. Fire Systems Review Approval Conditions Page I of2 . . . , FH74 PRELIMINARY PLAT APPROVAL Preliminary Fire Engineering approval has been granted based upon the following information provided. To obtain final Fire Engineering approval, the following item(s) must be submitted to the DDES permit service center; reviewed and approved: 1. Certificate of Water Availability. (Provided by appropriate water purveyor). Valid one year from date of signature. Minimum acceptance flow shall be 1000 gallons per minute at 20 pounds per square inch residual pressure. II. Three copies of plans indicating: A. Fire hydrant(s) location -measured by vehicular travel distance. (K.C.C. Title 17) Residential 1. 700 ft. maximum spacing. 2. Not more than 350 ft. from each lot. B. Watermain placement (K.C.C. Title 17) I. Source (i.e.) supply connection. 2. Main sizes identified. C. Fire access roads Ref. TFC, Sections 501 through 503, 2003 addition I. Minimum 20 ft. wide unobstructed -13' 6" vertical clearance, unobstructed. All-weather surface, able to withstand 25 tons. 2. Fire access roads in excess of 150 feet (dead-ends), must have a tum-around area. Required turn-arounds must be a minimum 80-foot diameter.[INCLUDING TEMPORARY TURNAROUNDS) 3. Fire access roads must provide 20-foot minimum inside turning radius and 40 outside turning radius when said roads change direction. 4. Fire access roads shall not exceed 15% grade. 5. The required width of any fire apparatus access road shall not be obstructed in any manner, including parking of vehicles. Minimum required widths and clearances established under this section shall be maintained at all times. D. Marking when required, approved signs or other approved notices shall be provided and maintained for fire apparatus access roads to identify such roads and prohibit the obstruction thereof or both. Ref. !FC, Sections 501 through 503, 2003 edition FH77 FINAL PLAT APPROVAL Final plat approval requires an inspection and approval of the fire hydrant and water main installation by a King County Fire Inspector, prior to recording. Call [8881546-7728 to schedule an inspection; after a permit to install has bee obtained from DDES; Fire Protection Engineering. Fire Systems Review Approval Conditions Page 20f2 • Page 1 of3 Sandy Bailey From: Florent, Ray [Ray.Florent@METROKC.GOV] Sent: Tuesday, May 30,2006 1 :51 PM To: Curtis G. Schuster Cc: Wayne Potter; Kolin B Taylor; curtisschuster2@hotmail.com; andrusb@ctt.com; Sandy Bailey; Tibbits, Chad; Claussen, Kimberly Subject: RE: 1158392 and 1199472 legal lot status • Curtis, RE: L06P0001 -Plat of Cavaila For your records, DOES is satiSfied that the parcels combined, underlying the preliminary plat of Cavalla, are recognized as one legal separate lot. Therefore, we are satisfied that the Plat of Cavalla satisfies our separate, legal lot requirements. Thank you for your e-mail, Ray Raymond E. Florent, PLS DOES Chief Land Surveyor / Engineer IV Land Use Services Division Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 (206) 296-6790 Fax (206) 296-6613 From: Curtis G. Schuster [mailto:battlecat@msn.com] Sent: Friday, May 26, 2006 9:31 AM To: Florent, Ray Cc: wpotter@novastardev.com; 'Kolin B Taylor'; curtisschuster2@hotmail.com; andrusb@ctt.com Subject: FW: 1158392 and 1199472 legal lot status Ray, Regarding the King County project # below; will you please review the e-mail correspondence, and let me know if Bruce at Chicago Title has it correct? In our screening letter, King County staff has stated that we have no shown our legal lot status. We need your help. Please let me know if the information below is enough, or if we somehow should provide staff with something else. Thank you, Curtis G. Schuster Project Administrator KBS III, LLC/KBS Development Corp. From: Sandy Bailey [mailto:sbailey@novaslardev.com] Sent: Wednesday, May 24, 2006 1:30 PM To: Curtis G. Schuster Cc: wpotter@novaslardev.com Subject: FW: 1158392 and 1199472 legal lot status 6/212006 MAIN FILE COpy ~.=! ~ Is n \\;; 12 r~n\, _i~'.V, -'1'\' liHI ~;~ .; . L06P0001 Sandy Bailey Novastar Development Inc. 18215 72nd Avenue South Kent, WA 98032 425656-7400 425251-8782 (fax) From: Wayne Potter Sent: Wednesday, May 24,20061:19 PM To: Sandy Bailey Subject: FW: 1158392 and 1199472 legal lot status Sandy, Can you get this number to Curtis. Thanks. Wayne From: Curtis G, Schuster [mailto:battlecat@msn.comj Sent: Wednesday, May 24,2006 12:45 PM To: Wayne Potter Subject: RE: 1158392 and 1199472 legal lot status Wayne, Please let me know the King County File number for Cavalla so I can reference it with/for Ray. Thanks, Curtis From: Wayne Potter [mailto:wpotter@novastardev.com] Sent: Monday, May 22, 2006 1 :07 PM To: Curtis G. Schuster Subject: RE: 1158392 and 1199472 legal lot status Curtis, Page 2 of3 I think that you should call Ray and see if you this is an issue or not.. an e-mail to Ray may work .. We just need to have some direction so that we can re-submit. Wayne From: Curtis G. Schuster [mailto:battlecat@msn.com) Sent: Monday, May 22, 2006 9: 17 AM To: Sandy Bailey; Wayne Potter Cc: curtisschuster2@hotmail.com Subject: FW: 1158392 and 1199472 legal lot status Sandy and Wayne, Below is the response from Bruce at Chicago Title regarding legal lot status at Cavalla. Wayne, do you think an e-mail to Ray Florent would help? 6/2/2006 Curtis From: Andrus, Bruce [mailto:Bruce,Andrus@crr.COMj Sent: Friday, May 19, 2006 11:24 AM To: Curtis G, Schuster Subject: 1158392 and 1199472 legal lot status Good morning Curtis, Page 3 of 3 I have taken a look at these files to try and find a deed establishing legal lot status prior to 1972, Here is what I found, The 1907 filing of the subdivision of Cedar Park Five Acre Tracts created the lots and blocks as shown on the face of the plat. This plat also dedicated to the public the use of the streets as shown on the plat. I have attached hereto a copy of the plat. In 1979, King County Ordinance No. 4406 was recorded under Recording No. 7908150748. This Ordinance vacated the street lying east of and adjoining Block 4 of the plat. By operation of law, the vacated street would have attached to each lot adjoining the street. I have attached hereto a copy of the Ordinance. I can locate deeds for the lots dating prior to 1972, However, because the street wasn't vacated until 1979, there are no deeds prior to 1972 that include the lots and the vacated street adjoining. I'm not sure what more information I can provide to help you with this. I'm not sure if there is something specific the County is looking for or not. Perhaps this information will be sufficient to establish legal lot status. Let me know if there is anything more I can provide to assist you with this process. Thanks and have a great weekend, Bruce Bruce H. Andrus Senior Title Officer/ETU Manager 425-646-9883/fax 425-646-9879 email: andrusb@ett.com 6/2/2006 L ~J , <~, '--,,,' r -_Q~~~TY-;'::~-'_'--TB<?~~ --'l'~' I ,~~ -, " e , -""-"-~ 4 f) ~ I i~ -' , , I 6 I , I --'~ J , 7 I ---~"'-"-- .I Q , 8 L II j r-------"'-~Sj f~ i _ ""'''-j,-- / --"~;- ,- b .j" 4 ~ --'\/i I 5 i .~ I 6 I I (.', \',: .~ F'IVR ACIlR DE:..SCRIPIJON "'. 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A/.I",~i --c J!Yrllih ;"'/--"do~y CoI.-,,-lIu 0/ IC~ .. , " I ,if /'4 I idr~., a nolo"I ,dvbl:c 'fi and /Of i/IC;, )laic of MJY'Ing/on, rr-Ya:r'!9 a/ Jm//K;"irJ:.;he o~ rlOl7Ko.-coul?hj Cfflr1doic;, 01/4' cW'n rlll,x,ID17eo', ,;5JvO/'r,. una' 'i'f/oi:j;,o"C/o here.,::!; --c;':{ (1{lI ,-/t.:vl on It/IV 19!t1 doy of Jane ~{, 0 jSl()7 fefon:; rn.-: ,DI>r,~on(JI/li:"(}{J(KO.f'(:'" .5 F'na,r~!J (nd C j ';'0->:.Y!, !a me PC' ,')(U'lOI'(}j kNown :b be #k; jYcdba7i Orl{j'3q:rdDf¥ KJ"=,;'W..y uf file F«olly LOOi} ¥ !'-3atjlonq CO, Ihe OJrpG/OT/~O 1111'11 r.-:,ccv!Ci( /he W1/1;1'I Irn/i-vrncn/. end cod/lYle "cfKroldj {J(Jmow/cogr:o J'fM. ;;;>old ,h~-;jrulnC/11 hlk: Ihc Iic~ and VOI'unlor!l act (Joci d"cd (/ !he .xJld CQlf'Oro/iWl_ .&-J~ II.!;e%OrJO purpOX-5 IJJ&cm mcn//D!}Cc7,OrV WI oolh ~-;foli;d /110) ky i4p~ a,-jIJorup:7 10 cicct/lc ,_VIC" lJ'olruff/(';ol and ltv! he ,:va/o//r_ux.l I.) I~ __ a;rpora/c .=aI of' /he ,~a,b cor,.uxa!IO'7 GIVer; ",nder 17!!1 hOlu (/nO r!/liC/<JI.xpf-/f;c'·O:qy "Orla !J(,4r II] #;/.5 ca/;!icok Il, • .i otJoPC H!CI7flOne{/ M M fioltrlC.5 ;).0/00' 1 "vb/It; If! o.nd kr IN 510lc 0/ Jt/n.Y!:;ylon and fr-<Ydmg al.:5r-.ollk; :,-&;;..:h~;'i;o "?~;;'''''?I!pro~;;; 1",.5 ~ih:ra!l 0/ June 4D 1.907 ~. JJj' fr!cYT'~/ __ " . frpv:'1!1 __ )urvC!ior A L lhlt!ntmc Cevnly Ourv'::'V0.f' .J -, 7 I ~--i"'-~--1 --~ -I, '\ I I ~~~. __ OA.D---::#".._ .~,_ .. 49564' I1kd lOr n;cord a/ iii<: rcquc.:>! 01 Rcal':; Loon S B:mlrrng w 0I'i Ihl.5 <?8lhda!lof L,t..m: AD 1907 ol35mmu/t::; pad.J PM (Ira r~o:xdcd lEI mI t5 cf phh fXKI~ 91 1it(X)r(b 01 fting Co c- ~" =-.:' ". ". :. 1 . 1_ "" • .-d of _ 0/ II . '" " o .0 M " . .'.0 .... ~ .~ ,~ . ,.i!l a M " " 8 Tl!E GJlA...\'TOk ..:- SlaIatclrr ,vcitrcmtY .'Pi!Id" TSSl!S.l r •. __ '& ~~, ~.&Cqu1red" fine u T!mESA. Y. RYS'l'I~)' a'-sina;lB ~ U·b&r ~&i.te.·P1'Opert.Y, "ldrAnd bo colllllien.tioa of Three lbOWlAl)d mn". Hundred Dollars ~ ~ _ w -{$),9(Xt."{lO} - -._ .. .~ . .' .. iii 1a:Qd J*it:!, ~.ad~. to DONALD W. NBLSOH, 11. dl'li1e man. _ -w ~ - - • Stale oJ:. 1.0 .... 4, 1I1ock b.. C!!d.lll' Park Fi'ia Ae~ TrllCte, u pel'" plat recorded in 'l<ilum,i lj 0" PlatlJ, Qn ":.ge 9l~ recurd" of !iing county, Sit.uate in th.e County Dr I(1nl:, state of WUh.1ngt.on. .1! .. ,,", . .:, q'..J SAL£,s... . . . ';II" P)l 1'" l.!I;rv .' •. 0- 719/;6 . RECORDED VOl •••••••••••••••••••••• ••••• PAGE .....•..•.. R£QUEST OF Statutory Warranty Deed D. THE GRA1'TOR ~ CAATltti AND NBILIE M. CIJ!TI!:R, hiJI wiC. lot and in consideration of Ten Dollars ani other good And valuable cons1derationB. in band paid, conveys and warrants t~ru.ce Waterhouse am Matilda Waterhouse, h15 wife tbe following deS(:ribed real e5tl!.te, sHu:ued in the County of KINO • St.l~ 01 Washington : Tract :3 in Block 4 ot Ceda.r P&rk Fi'ftl Acre TraotB, as per plat recorded in Vol\ll!l8 15 of Plat! on page 91, recorda of Klnfz CountyJ situate lit the County of lU.ni:J State of 'tluhington. !XCEPl"OO .11 c~81 and mmeral rights whioh shall be retained by the sellar. MUS lAX 'AID ON CONIRACI AFf. No'. A. A. TREMPER, KING COUNTY T~EASjjR~ This deed i:. gillen in (ul(illm/;,tl( uf (hul ccrl<)in Il"ill C!;\utc conllll('1 bt'twe{'f] thl:' (,lllttit!ii 'W,""!O, lia\,'d November 15 I 19 61 , .. nd C'onditioncd for the conveyanu!' of lhl~ .. hove dt'Sl'[lbl'U prol't'rl\, ;'no the covenants of warnmlv IIf~((~in L:onlaillcd \'l.haJl Ilot appI<j 10 Iln\ lillI', interC"sl 01 (!'n~'Ufllhran'" .'fI';U'l~ hv. tl1101J~h Of undl'r Ih~ p}-Ifchm,\t't ill flllJU conlrJll.,t, ~,nJ shall (lOt IIpply ttl UllY 1:'xC~j Ilss"j';:<.n1l'111~ nr ,)lit(" /'h.,r~',,·, \('\'ipd, .. "" .... !'il"f'd Of brlcomillg du~ubscqut!nl to tht· ri~tl,' 'If s,lid contrad. DIltftl tbis 12th day ilf Oct,ober , t. 03 Ie . :lO. • ... J . . c. :!.L \liUI.) IM.AI I STATE Of' 1I'.-ISHll':OTON, f I, n, t 'ounly of King On thia dillY prtsonaily .ppf~u~d ut'lorr me Rex Carter and :iallie M. Carter 10 me knowrtl 10 M lbe indlYidual. de*:ri~ in and who e~f(UIt'd l~ witbin and f1lT ... "i~ inlttumrnl, And 'rft .nd voluntary ItCI .nd dml, IlIr ,he' ICknowll!d~ lh.al th.:r aijp1ed thr lime u "their llses and pUI'pOIW'$ ~In mtnllOMd. GJ\ EX tm~~"~ ~ ofl\dalllt'lIl this : J" ; ,.; King County Department of Development and Environmental Services Land Use Services Division Attn: Mr. Chad Tibbits, Project Manager II Current Planning Section 900 Oakesdale Avenue S.W. Renton, WA 9055-1219 RE: Resubmittal! Additional Information Plat of Cavalla King County File No. L06POOOI Our Job No. 11778 Dear Mr. Tibbits: • CIVIL E:NGINl::cHING. LANe P,-ANN!NG. SURV::v'NG, EN\lIRONMEN1Al SEnVICES November 20, 2006 I am enclosing the following documents for your use in reviewing and processing the preliminary plat of Cavalla. 1. Ten (10) copies of the Traffic Impact Analysis dated October 31, 2006, prepared by DN Traffic Consultants 2. Ten (10) copies of he 162nd Avenue S.E. extension plan prepared by Barghausen Consulting Engineers, Inc. 3. Twenty-five (25) copies of the revised preliminary plat map, road, drainage, adjacent property owners map, and tree retention plans. The following is a response to the May II, 2006, Plat Screening Transmittal letter. A brief response to each issue (in order) from the Plat Screening Transmittal is provided below: Drainage: • Please revise the conceptllal drainage plan to show detail of how the proposed drainage facility will outtali to the south. The pian submitted appears to show dispersal across the proposed sidewalk, Yt-'hich is not an acceptable discharge design. Response: The discharge of the storm pond (Tract A) on Sheet C2 indicates the connection of the storm drain outlet to a proposed storm system in 162nd Avenue S.E. The improvements to 162nd Avenue S.E. are to be extended as part of the proposed plat of Liberty Gardens (King County File No. L04P0034). If the plat of Liberty Gardens is not developed, the discharge would be designed as a sheetflow separator to the extension of 162nd Avenue S.E. .,I---'~ (;~ I'-c !~ -Co ,~\ MAIN FILE COpy 18?15 72ND AVENUE SOUTH BRANCH OFFICES • OLYMPIA, WA 0) !~,JC OC', 1-'1'" i, ! r11 -. -'-, I I ; ,~ L) I u! ,II III Z t 20eb ' .. _J King County Depmtment of Development and Environmental Services Land Use Services Division Attn: Chad Tibbits, Project Manager II Current Planning Section -2-November 20,2006 • Please show how the 3: I length to width water quality ratio is to be achieved in the drainage facility, Response: The storm drainage and water quality pond is revised to provide a battling system to meet the 3: 1 length to width ratio, Traffic/Roads: • The Subdivision Technical Committee has noted ill ollr review to date that all evaluation of the impacts of the three pending plats: Cavalla (L06POOOl), Liberty Gardells (L04P0034) and Threadgill (L05P0026) will have an impact all a listed High Accident Location at the intersection of Southeast 128th Street!162nd Avenue Southeast. Response: Please attached Traffic Impact Analysis (TIA) prepared by DN Traffic Consultants for the plats of Threadgill/CavallalLiberty Gardens dated October 31, 2006. • The STC wishes to advise you that potential mitigation that appears to be feasible and capable of heing accomplished is available to address the cumulative and significant impacts of your proposed development and the other two pending plats cited (Liberty Gardens and Threadgill). This mitigation would include an extension of the frontage improvements for the plat of Threadgill easterly from 164'h A venue SE to the intersection of 166'h Avenue SE. Response: In a combined effort with the developments of ThreadgilVCavallaiLiberty Gardens, Barghausen Consulting Engineers, Inc., surveyed the unimproved right-of-way of the potential extension of S.E. 136th Street east from the plat of Threadgill to the existing road improvements near Liberty High School. Additionally, as an option of the three developments, we also surveyed the unimproved right -of-way of 162nd Avenue S.E. from the southwest corner of Liberty Gardens to S.E. 144th Street. Barghausen Consulting Engineers, Inc., then requested that Chad Armour, LLC, locate any environmentally sensitive areas within the right-of-way of both options. With this information, Barghausen Consulting Engineers, Inc., prepared preliminary road designs and profiles to determine the potential for a road extension for a secondary access for all three projects. We then met with King County to discuss these options. Based on the fact of topography, grades, and sensitive areas and for the fact that existing right-of-way does not exist for the complete roadway section, it was determined that the preferred option for this project is the extension of 162nd Avenue S.E. to S.E. l44th Street. The 162nd Avenue S.E. extension also has sensitive areas; however, based on our design, we believe they can be mitigated. Furthermore, we believe that this access provides a better alternati ve secondary access for this area. King County Department of Development and Environmental Services Land Use Services Division Attn: Chad Tibbits, Project Manager II Current Planning Section -3-November 20, 2006 • This would also appear to address issues of school walkway safety (RCW 58.17) to Liberty High School and Briarwood Elementary. This connection provides access to a currently-signalized intersection ofSE 128'" Streetl16rjh Avellue SE. Response: As required by King County DDES, we have designed the plat to provide on-site sidewalks as well as access through the proposed park (Tract il) and through a IO-foot pathway serving Libelty High School. It is our understanding that the same requirement is required at the plat of Cavalla. This access will provide safe access for the high school students being served by Liberty High School. We will need to meet with the School District and determine if openings to the existing fencing surrounding the high school would be appropriate. • This potential environmental millgation will be jimher evaluated during the traffic review of each the other two plats currently being reviewed, as well as this project. A similar request is being made of the Applicants for the Cavallo plat and the Uberty Gardens plat. Response: Comment noted. A TIA for all three projects (Threadgill/CavallaiLiberty Gardens) has been prepared and is enclosed with this resubmittal. • In order to review the proposed project, please provide a conceptual frontage improvement plan for SE 136th Street (plan and profile) --extending easterly between 164th Avenue SE and 168th Avenue Southeast. This extellsion should be designed to the standards for a Neighborhood Collector, and the plan view should include any required retaining wails/rockerieS/slope grading in addition to the roadway improvements consisting of a curb, gutter and sidewalk sectioll, a minimuill of 22 feet of paving, (ltul associated ,to rm water facilities (culverts) and detelltion/treatment. A full 60-foot wide right-of-way extends through this segment, except for parcel located on the (if extended) southeast corner ot the 164th Avenue SEiSoutheast 136th Street intersection. There appellrs, here, to be a 30Joot wide right-ot-way on the north side of Southeast 136th Street and a roadway e",ement (also 30-jeet in width) on the sOllth side otthe 'centerline' of this roadway. Response: As discussed above, we have analyzed both sections and provided conceptual profiles to King County. Also, Mr. Curtis Schuster met with the property owner of Tax Lot 1323059039 (Lovegren) to discuss the potential of obtaining additional right-of-way for the extension of S.E. 136th Street. Mr. Lovegren indicated that he really did not want additional traffic across his property and that any further proposals he would need to discuss with this attorney. Based on this information as well as further research in this area, we determined that the preferred option is the extension 162nd Avenue S.E. to S.E. 144th Street from the southwest comer of Liberty Gardens. Therefore, we have enclosed ten (10) copies of the proposed alignment, road improvements, and profiles. King County Department of Development and Environmental Services Land Use Services Division Attn: Chad Tibbits, Project Manager II Current Planning Section -4-November 20, 2006 • In order to deterJlline the precise roadway section required, and walhvay improvements needed, please provide a Level 2 TIA. 11,is TIA should include an assessment of the cUlllulative impacts of the three pending developlllent applications (Threadgill, Cavalla, and Uberty Gardells), the volullle of impacts at the HAL at Southeast 128thl160th Avenue SE, and any additional non-project traffic (Uberty High School and existing developed lots in the vicinity) that would reasonably be expected to travel on this section of Southeast 136th Street. Include impacts and levels-oFservice (AM and PM peak hour, during the school year) at (at least) the following intersections: 156th Avellue SEISoutheast 136th Street. 169th Avellue Southeastl Southeast 128th Street Southeast 136th Streetl160th Avellue Southeast Southeast 128th Streetl156th A vellue Southeast Southeast 128th Streetl160th Avellue Southeast Response: We have enclosed ten (10) copies oCthe Level 2 TIA prepared for the plats of ThreadgilllCavallalLiberty Gardens that addresses all of the intersections referenced above and the high accident locations. • In addition, the proposed project may have a measurable (1 or more peak hour trips) at a High Accident Location (intersection) at the intersectioll of State Route 9001 164th Avenue Southeast. Please include. ill the T1A, an assessment of the project's impacts (number of peak hOllr trip-ends. ollly) at this locatioll. Based upon the impacts of the development at that location, a requirement may be imposed to financial contribute (reimbursement) towards reduction of the impacts of the HAL (signalization at the intersection of 148thl SR 900) via signalization being jointly funded by other developments in the area. Response: As indicated in the Level 2 T1A, all three plats will be required to pay an MPS mitigation fee and a pro rata share of the cost of the improvements at the 148th Avenue S.E. and SR-900 intersection. Additional road comments: 1. KCRS Section 2.09.4 requires that the roadway to which WI alley (Tract "C") connects shall be a minimum of 28 feet in width (i.e. the Subcollector standard), with vertical curbs. Please revise Road "A" to comply with this requirement. Please revise the design of the fralltage improvements to 162"" A venue SE to comply with this requirement. Response: As required by King County, we have made the appropriate revisions and provided the minimum of 28 feet of road width. 2. Please provide a conceptual plan for an alternative desigll for the south half of the proposed project (the parcel upon which was proposed the preliminary plat of King County Department of Development and Environmental Services Land Use Services Division Attn: Chad Tibbits, Project Manager II Current Planning Section -5-November 20, 2006 Dickenson) Ihat provides a public slreet connection between this plat and the proposed plat of Liberty Gardens, and terminates Road B with a temporary turnaround. R.sponse: This comment is no longer applicable since we are proposing the extension of 162nd Avenue S.E. to the intersection of S.E. l44th Street. Therefore, a turnaround is no longer applicable. 3. Alleyl Tract "C' Alleys shoald have a straight cross-fall, or, normal croW/l sectioll. Please revise, and adjust the conceplual drainage plan as necessary. Please revise the design /lear the NE corner of proposed Lot 34 to accommodate the low-speed carve rerjairementfrom KCRS 2.10. Please provide verification that 150 feet at' stopping sight distance will be available t"roagh the entire lenglh of the alley -in particular at/near the carve abutting the NE corner ot'Lot 34. Response: We have added a ISO-foot stopping sight distance triangle to the plan to show this requirement can be met. 4. Please provide a TrafJic Impact Analysis to address the impacts of the proposed development al the following inlersections: • • • SE 128'" StreetliMJ" Avenue SE SE 128'" StreetIl56'" Avenue SE SE 136'" StreetI156'" A venue SE Response: These intersections have been addressed in the Level 2 TIA prepared by ON Traffic Consultants dated October 31, 2006. 5. Please revise the site plan to show a temporary turnaround at/near the southerly end oj 162"" Avenue SE. Response: A temporary turnaround is no longer needed for this project because the plat will be required (along with the plats of Threadgill and Liberty Gardens) to extend l62nd Avenue S.E. to S.E. 144th Street. Critical Areas: • Please demonstrate that buffers being used to protect off-site wetlands are correctly using the current King County Critical Areas standards located ill KCC 21A.24. To King County Department of Development and En vironmental Services Land Use Services Division Attn: Chad Tibbits. Project Manager II Current Planning Section -6-November 20. 2006 Contact Nick Gillen. Senior Ecologist with questions regarding this requirement at (206) 296-7141. Response: As part of the extension of 162nd Avenue S.E. for the plat of Liberty Gardens. the impact to a wetland and buffer will be mitigated and. therefore. will have no impact to the southwest corner of this project. As part of l62nd Avenue S.E. improvements. a mitigation plan will be prepared for that project. Recreation Space: Submit a conceptual recreation plan that indicates the type of improvemel1ts (i.e. sport court, play structure, benches, landscaping, etc.) proposed within the recreation tract(s}. See KCC 21A. 14. 1 80(E)(2} for equipment requiremellls. Response: Please find enclosed the preliminary plat landscape park plan as required by King County. The park provides two play structures and meets the required park area. See Sheet PLl of 2. Conceptual Significant Tree Retention Plan (Mitigation); Submit a conceptual significant tree retention plan and lor {/ mitigation plan for the plat. Response: Please find enclosed the significant tree retention plan based on King County requirements. As required by code, we must provide 89 replacement trees. We are proposing to sa vc five trees on site. Walkways: Provide an inventory map (i.e. existing conditions -widths, surface type, etc.) or the walking routes to the elementary, middle schoolljunior high, and high schools and/or the appropriate bus stop location associated with each school. Identify any improvements necessary to provide safe walking conditions. Response: An inventory map is not required because all grades (elementary and junior high school) are bused. However. high school students (Liberty High School) will get access to the school (which abuts the plat's east boundary line) via a 10-foot pathway (Tract C). Proof of Legal Lot: No proof was submitted that this is a legally segregated lot. The underlyin!! 1907 plat did not create legal/ots. A deed for the parcel in the present configuration dated prior to October I, 1972 or tax records prior to 1972 with the parcel in the current configuration were not submitted. Response: On May 26. 2006. we provided this information to you from our title company. However. we have also enclosed additional copies for your review and approval. King County Depm1ment of Development and Environmental Services Land Use Services Division Attn: Chad Tibbits, Project Manager II Current Planning Section -7-November 20, 2006 Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necesMlry, as a reslIlt of above-referenced requests for additional information. Response: As required by King County, we arc providing 2S copies of the preliminary plat of Ca valla. preliminary road and profiles, and drainage plan, adjacent property owners map, tree survey map, off-site extension plan for 162nd Avenue S.E., preliminary park plan, and significant tree retention plan. I am confident that the enclosed information provided adequately addresses the Plat Screening Transmittal letter dated May II, 2()06. If you need additional information, please contact me. GWP/tep 11778c.()06.doe ene: As Noted cc: Mr. Bob Ruddell, KBS III, LLC Mr. Kolin Taylor, KBS III, LLC Respectfully, .',"') ~ rx!JaJ~~--r~ G. Wayne Potter Project Manager Mr. Curtis Schuster, KBS Development Corp. (w/enc) Mr. Daniel K. Balmelli, Barghausen Consulting Engineers, Inc. Mr. Ali Sadr, Barghausen Consulting Engineers, Inc, King County Department of Development and Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Renton. Washington 98055-1219 (206) 296-6600 Alternative formats available upon request Drop-Off Cover Sheet for Land Use Services Division ** * ***** ** ** ***** ******IMPORT ANT******** ******* * ******* PROJECT NUMBER AND NAME IS NECESSARY FOR ALL DROP-OFFS Project No.: Project Name: FROM: TO: L oroPODOi WDd1,AJI;: p~ , Barghausen Engineers Company Name / Contact Person Telephone No. (425) 251-6222 CHk!) -ri 613irs Date Received by LUSD ~[ECCLE~\£ILE~ NOV 2 2 Z006 K.G_ D.D.E.S_ ADDITIONAL INFORMATION REQUESTED BY KING COUNTY STAFF (please print) Lot Line Adjustment Permit Please specify item(s) dropped-off: Right of Way Permit Please specify item(s) dropped-off: Clearing I Grading Permit Additional information requested; please specify item(s) dropped off: Other __________________________________________________________________________ __ PLEASE NOTE: All drop-off item(s) will De logged into the computer under the project numoer, therefore, it is important that the top portion of this form is completed properly Defore you Ali2A-Wi' ... v)y!hing. Assistance in finding a project numoer can De provided oy speaking to a Land Use Services DivisioW]!l~l'sIi~Q:t~POD) or the Zoning/Land Use Technician. Your cooperation is important. Thank you. LUSD Drop-Off Cover Sheet Ig-cvs-dropoff.pdl 05-30-2002Page 1 01 1 <® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 August 15, 2006 KBS III, LLC Attn. Kolin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 RE: Application for the Preliminary Plat of Cavalla DOES File No. L06P0001 Dear Mr. Taylor:. The August 11, 2006 letter requesting an extension of the deadline for submittal of the additional information required to process the preliminary plat application of Cavalla has been received. The request for additional information stops all processing of the plat application until the required information is received. The time spent waiting for information to be submitted is not counted toward any time limit requirements of the plat application process. The previous letter established a deadline of August 11,2006. We are granting an extension to this deadline. If the Land Use Services Division of DOES does not receive the necessary information requested to process your application by December 6, 2006, your application will be canceled or denied. If you have any questions regarding this matter, please call me at (206) 296-7194. Cc: DMP, Inc., Attn. Mel Daley, 726 Auburn Way North, Auburn, WA 98002 Kirn Claussen, Project/Program Manager III, Current Planning Section, LUSD Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD Kris Langley, Senior Engineer, KCDOT Application File L--- /I .1 Y " . Mr. Chad Tibbits King County Department of Development and Environmental Services 900 Oakesdale Avenue S.W. R~i1t(;n, \VA 9S0S5··1219 CIVil ENGINEERING, LAND PLANNING. SURVEYING, aNIRONMENTAL SERVICES August II, 2006 RE: ~l:;:s~:~a~~ditional Submittal Time for Additional InT~~t~ [:;. ~ "[ [2 im l . 0, , King County File No. L06POO I n I . c...j Our Job No. 12424 J U .AUG 2GGG Dear Mr. Tibbits: K.C D,D.E,S. On behalf of KBS Development Corporation, we have been working on several outstanding issues for the preliminary plat of Cavalla. Approximately one month ago, we met with DDES staff to analyze the combined traffic impacts of Cavalla, Liberty Gardens, and Threadgill. King County has determined that a secondary access will be required for these projects; therefore, we analyzed two access scenarios, On August 8, 2006, we met with Mr. Bruce Whitaker, Ms. Kristen Langley, and Mr. Nick Gillen to review these alternatives. As a result of that meeting, we have been asked to do further research on this access issue; therefore. we are requesting an extension to the resubmittal deadline. Should you have questions or need further information, please contact me at this office, Thank you, GWP/dmlath 12424c.003.doc enc: As Noted ~spectfu~'g;' . r,-~~;~~~-~ ~-"'-' ----) G. Wayne tter Project Manager cc: Mr. Curtis Schuster, KBS Development Corporation '<''',"c,"rncc~cm '=."'-'""'"'~" ,o"L4?~/ I, BRANCH OFFICES • OLYMPIA, WA • TEMECULA. CA • RANCHO CORDOVA. CA /, .41 www.barghausen,com y ~e:.,",AV fIJ~~.s-~ .' ,; 1.- o ( .j"':-• o (j .. " "'" -<>-, <2-'" I'vG E:NG\~'"~ rn c') cn ", Chad Tibbits ,-.) King County DOES 900 Oakesdale Avenue S.W. .:;-1 ( -) Renton, WA 98055-1219 -u <' >~ : -.:::r. :-f-' ~J :.--: i _-: Ul -" 182~5 72NDAVENU[ SOUTH KENT, WA 98032 ; ; . L ; j " : \ ; \ \ ; : : , \ : \ :;, ! : , \ ; "I ; \ : " \ : ~ ; ; y ; : i : "i j ; " : \ ~ ; , . " , \ t ! ~~Q~~-~~\~-nG ~QQ~ '. <® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 May 11,2006 KBS III, LLC Attn, Kolin Taylor 12320 NE 8th Street, Suite 100 Bellevue, WA 98005 RE: Notice of Request for Additional Information or Studies Application No. L06P0001 -Cavalla Plat Date Filed: January 12, 2006 Date of Complete Application: February 9, 2006 Dear Mr. Taylor: The purpose of this letter is to notify you pursuant to King County Code Title 20 that the Land Use Services Division is requesting additional information and/or studies to complete the review of your project. The information is described on the enclosed piat screening transmittal. When submitting the requested information, include a copy of the plat screening transmittal and retain a copy for your records, Provide a cover letter, which lists how each item, was addressed. Any clarification or explanation of the submittal can also be included in the cover letter. Please submit the information to: King County Dept. of Development and Environmental Services Land Use Services Division A TIN,: Chad Tibbits, Project Manager II, Current Planning Section 900 Oaksdale Avenue Southwest Renton, WA 98055-1219 If the submittal is hand delivered, submit at the address above. Your application is on "hold" from the date of this notice, until the date you are advised that the additional information satisfies this request or 14 days after the date the information has been provided. You will be notified if the Division determines that the information is insufficient. Please note that the supplemental information required after vesting of a complete application shall not affect the validity of such application, The deadline for the submittal of the necessary information is August 11,2006. In the event you feel extenuating circumstances exist, which may justify an extension of this date, you may submit such request, in writing, for consideration by this Department. Failure to meet the deadline shall be cause for the Department to cancel or deny the application. MAIN FILE coPY If possible, please submit all of the information in one package. If you have any questions, regarding the additional information or the submittal deadline, please call me at (206) 296- 7194. Sincerely ad Tibbi , roject/Program Manager II Current Planning Section Cc: Barghausen Consulting Engineers Attn. Ali Sadr, 18215 72 0d Avenue S., Kent, WA 98032 Kim Claussen, Project/Program Manager III, Current Planning Section, LUSD w/enc Bruce Whittaker, Senior Engineer, Engineering Review Section, LUSD w/enc Kris Langley, Senior Engineer, Traffic & Engineering Section, KCDOT w/enc Nick Gillen, Senior Ecologist, Critical Areas Section, LUSD, w/enc Application File w/enc King Count)' Department of Development anti Environmental Services Land Use Services Division 900 Oakesdale Avenue Southwest Remon, Washington 98055-1219 'Iat Screening Transmittal Preliminary Plat Application 0, vavalla LUSD File No. L06P0001 Date of Information Request: May 11, 2006 Deadline for Submittal of Information: August 11, 2006 Please provide ten (10) copies of the following, unless otherwise noted. Drainage: • Please revise the conceptual drainage plan to show detail of how the proposed drainage facility will outfall to the south. The plan submitted appears to show dispersal across the proposed sidewalk, which is not an acceptable discharge design. • Please show how the 3: 1 length to width water quality ratio is to be achieved in the drainage facility. Traffic/Roads: • The Subdivision Technical Committee has noted in our review to date that an evaluation of the impacts of the three pending plats: Cavalla (L06P0001), Liberty Gardens (L04P0034) and Threadgill (L05P0026) will have an impact on a listed High Accident Location at the intersection of Southeast 128th Street/162nd Avenue Southeast. • The STC wishes to advise you that potential mitigation that appears to be feasible and capable of being accomplished is available to address the cumulative and significant impacts of your proposed development and the other two pending plats cited (Liberty Gardens and Threadgill). This mitigation would include an extension of the frontage improvements for the plat of Threadgill, easterly from 1641h Avenue SE to the intersection of 166 1h Avenue SE. • This would also appear to address issues of school walkway safety (RCW 58.17) to Liberty High School and Briarwood Elementary. This connection provides access to a currently-signalized intersection of SE 1281h Street/169lh Avenue SE. • This potential environmental mitigation will be further evaluated during the traffic review of each the other two plats currently being reviewed, as well as this project. A similar request is being made of the Applicants for the Cavalla plat and the Liberty Gardens plat. • I n order to review the proposed project, please provide a conceptual frontage improvement plan for SE 136th Street (plan and profile) --extending easterly between 164th Avenue SE and 168th Avenue Southeast. This extension should be designed to the standards for a Neighborhood Collector, and the plan view should include any required retaining walls/rockeries/slope grading in addition to the roadway improvements consisting of a curb, gutter and sidewalk section, a minimum of 22 feet of paving, and associated stormwater facilities (culverts) and detention/treatment. A full60-foot wide right-of-way extends through this segment, except for parcel located on the (if extended) southeast corner of the 164th Avenue SE/Southeast 136th Street intersection. There appears, here, to be a 30-foot wide right- of-way on the north side of Southeast 136th Street and a roadway easement (also 30-feet in width) on the south side of the 'centerline' of this roadway. • In order to determine the precise roadway section required, and walkway improvements needed, please provide a Level 2 TIA. This TIA should include an assessment of the cumulative impacts of the three pending development applications (Threadgill, Cavalla, and Liberty Gardens), the volume of impacts at the HAL at Southeast 128th/160th Avenue SE, and any additional non-project traffic (Liberty High School and existing developed lots in the vicinity) that would reasonably be expected to travel on Cavalla -L06P0001 05106 this. section of Southeast h Street. Include impacts and levels- during the school year) at , ..• least) the following intersections: 156th Avenue SE/Southeast 136th Street, 169th Avenue SoutheasU Southeast 128th Street Southeast 136th StreeU160th Avenue Southeast Southeast 128th StreeU156th Avenue Southeast Southeast 128th StreeU160th Avenue Southeast ,rvice (AM and PM peak hour, • In addition, the proposed project may have a measurable (1 or more peak hour trips) at a High Accident Location (intersection) at the intersection of State Route 900/164th Avenue Southeast. Please include, in the TIA, an assessment of the project's impacts (number of peak hour trip-ends, only) at this location. Based upon the impacts of the development at that location, a requirement may be imposed to financial contribute (reimbursement) towards reduction of the impacts of the HAL (signalization at the intersection of 148thl SR 900) via signalization being jointly funded by other developments in the area. Additional road comments: 1. KCRS Section 2.09.4 requires that the roadway to which an alley (Tract "C") connects shall be a minimum of 28 feet in width (i.e. the Subcollector standard), with vertical curbs. Please revise Road "A" to comply with this requirement. Please revise the design of the frontage improvements to 162 nd Avenue SE to comply with this requirement. 2. Please provide a conceptual plan for an alternative design for the south half of the proposed project (the parcel upon which was proposed the preliminary plat of Dickenson) that provides a public street connection between this plat and the proposed plat of Liberty Gardens, and terminates Road B with a temporary turnaround. 3. Alley! Tract "C" Alleys should have a straight cross-fall, or, normal crown section. Please revise, and adjust the conceptual drainage plan as necessary. Please revise the design near the NE corner of proposed Lot 34 to accommodate the low-speed curve requirement from KCRS 2.10. Please provide verification that 150 feet of stopping sight distance will be available through the entire length of the alley -in particular aUnear the curve abutting the NE corner of Lot 34. 4. Please provide a Traffic Impact Analysis to address the impacts of the proposed development at the following intersections: SE 128'h StreeU160'h Avenue SE SE 128'h StreeU156'h Avenue SE SE 136'h StreeU156'h Avenue SE 5. Please revise the site plan to show a temporary turnaround aUnear the southerly end of 162nd Avenue SE. Critical Areas: • Please demonstrate that buffers being used to protect off-site wetlands are correctly using the current King County Critical Areas standards located in KCC 21A.24. To Contact Nick Gillen, Senior Ecologist with questions regarding this requirement at (206) 296-7141. Recreation Space: Submit a conceptual recreation plan that indicates the type of improvements (i.e. sport court, play structure, benches, landscaping, etc.) proposed within the recreation tract(s). See KCC 21 A.14.180(E)(2) for equipment requirements. Cavalla -L06P0001 05/06 Con!=eptu<\1 Significant Tree Re ion Plan (Mitigation); Submit a con ual significant tree retention plan and/or a mitigation plan for th~ ... Ial. Walkways: Provide an inventory map (i.e. existing conditions -widths, surface type, etc.) of the walking routes to the elementary, middle school/junior high, and high schools and/or the appropriate bus stop location associated with each school. Identify any improvements necessary to provide safe walking conditions. Proof of Legal Lot: No proof was submitted that this is a legally segregated lot. The underlying 1907 plat did not create legal lots. A deed for the parcel in the present configuration dated prior to October 1, 1972 or tax records prior to 1972 with the parcel in the current configuration were not submitted. Revised Preliminary Plat: Provide 25 copies of a revised preliminary plat, as necessary, as a result of above-referenced requests for additional information. As a result of the review of the information, additional information (studies, revisions, etc.) may be requested at a later date. Further evaluation of these issues may result in the reconfiguretion and/or loss of lots. Cavalla -L06P0001 05/06 ® King County Department of Development and Environmental Services 900 Oakesdale Avenue SW Renton, WA 98055-1219 February 27, 2006 TO: Kim Claussen, Project/Planner Manager III, Current Planning Section FM: Pat Simmons, Engineer II, Engineering Review Section Via: Ray Florent, Engineer III, Engineering Review Section Planner: Chad Tibbits RE: Proposed Plat of Cavalla LUSD File No. L06POOOI Comments of the above project 1. The contours must be based on a field survey per KCC 19A.08.1S0(B)(2). A statement to this effect must be shown on the preliminary map. 2. No proof was submitted that is a legal lot the segregation. The 1907 plat did not create legal lots. A deed for the parcel in the present configuration dated prior to the October 1 1972 or tax records prior to 1972 with the parcel in this configuration were not submitted. MAIN FILE COpy ® King County Department of Development and Environmental Services 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 February 24, 2006 KBS III, LLC Attn. Kevin Taylor 12320 NE 8th Avenue, Suite 100 Bellevue, W A 98005 RE: Notice of Complete Application for Application Time Periods Application No. L06P0001 Date Filed: January 12,2006 Dear Mr. Taylor: The purpose of this letter is to notify you that on February 9, 2006, the Land Use Services Division determined that the above-referenced application is complete under current requirements for a complete application. This initial determination is intended only for the purpose of applying the time periods for permit processing specified in Ordinance 12196. Supplemental information may be requested by the Division, as necessary, for the continued review of your application. Our goal is to process your applications within 150 days. However, the complexity and level of analysis required to review your project and available staff resources will affect the actual review time. The time line can also be impacted by one or more of the following: • any request made by the Division for additional information • changes or revisions requested by the applicant • mutually-agreed-upon requests to stop the time clock • preparation of an Environmental Impact Statement • failure to post the property • resolution of land use decisions appeals If you have any questions about your application or the posting requirements, please contact me at (206) 296-7194. Sincerely, ,-7 ("'LI·::&- Chad Tibbits, ~er II LUSD, DDES Cc: Kim Claussen, Program/Project Manager III, Current Planning Section, LUSD, DDES Bruce Whittaker, Senior Engineer, Engineering Section, LUSD, DDES Kris Langley, Senior Engineer, Traffic Section, LUSD, DDES Application File MAIN FILE COPY CA VALLA 34 -LOT SUBDIVISION Permit Approval Conditions Document Fire System Review Tracking Number: L06POOOl The following conditions apply to the Fire Engineering approval of the above referenced preliminary plat: AA02 MUDD Any questions regarding the fire review of this plan should be directed to: Bill Mudd, Fire Engineering Telephone: (206) 296-6785. FHO! FIRE HYDRANT W ATERMAIN PERMITS A separate permit is required for the installation of water mains and/or fire hydrants. Submit three (3) copies of drawings and specifications to DDES Building Services Division Permit Service Center for a permit application. Review and approval by Fire Engineering Section is required prior to installation. Plans shall include, but are not limited to; pipe sizes, pipe type, valves/fittings, thrust blocks and/or rodding and material listings. Fire hydrants shall be installed per K.C.C. Title 17 Water mains shall be installed and tested per A WW A standards and/or NFPA#24 (STANDARDS FOR PRIVATE FIRE HYDRANTS AND W ATERMAINS); as applicable. Ref. 1001.4 UFC NOTE: UNLESS SPECIFICALLY NOTED, ANY W ATERMAIN OR FIRE HYDRANT DETAILS ON BUILDING PLANSIDRA WINGS HAVE NOT BEEN REVIEWED OR APPROVED. FH74 PRELIMINARY PLAT APPROVAL Preliminary Fire Engineering approval has been granted based upon the following information provided. To obtain final Fire Engineering approval, the following item(s) must be submitted to the DDES permit service center; reviewed and approved: I. Certificate of Water Availability. (Provided by appropriate water purveyor). Valid one year from date of signature. Minimum acceptance flow shall be 1000 gallons per minute at 20 pounds per square inch residual pressure. II. Three copies of plans indicating: A. Fire hydrant(s) location -measured by vehicular travel distance. (K.c.c. Title 17) Residential 1. 700 ft. maximum spacing. 2. Not more than 350 ft. from each lot. B. Watermain placement (K.C.C. Title 17) I. Source (i.e.) supply connection. 2. Main sizes identified. C. Fire access roads Ref. IFC, Sections 501 through 503, 2003 addition Fire Systems Review Approval Conditions Page 1 of3 MAIN FILE COPY 1. Minimum 20 ft. wide unobstructed -13'6" vertical clearance, unobstructed. All-weather surface, able to withstand 25 tons. 2. Fire access roads in excess of ISO feet (dead-ends), must have an approved turn-around area. Access road shall extend to within ISO ft. of all portions of building exterior walls. Required turn-arounds must be a minimum 80-foot diameter; or meet approved "hammerhead" requirements **********Including temporary turnarounds************ NOTE: The driving surface of Tract E and the driveway serving lot #26 must be a minimum of 20 feet in width; or any future residences constructed on lots 25, 26 and 27 may have to be sprinklered NFPA 13D. The driving surface of Tract F and the driveway serving lot #21 must be a minimum of 20 feet in width; or any future residences constructed on lots 25, 26 and 27 may have to be sprinklered NFPA 13D. The driving surface of Tract G has to be a minimum of 20 feet in width; or any future residences constructed on lots 18 and 19 will have to be sprinklered NFPA 13D. The driving surface of Tract H and the driveway serving lot #14 must be a minimum of 20 feet in width; or any future residences constructed on lots 13, 14 and 15 will have to be sprinklered NFPA 13D. The driving surface of Tract J and the driveway serving lot #11 must be a minimum of 20 feet in width; or any future residences constructed on lots 11 and 12 will have to be sprinklered NFPA 13D. A minimum 20- foot inside turning radius is required where Tract J intersects with the driveway for lot #11. The driving surface of Tract K has to be a minimum of 20 feet in width; or any future residences constructed on lots 6 and 7 may have to be sprinklered NFPA 13D. 3. Fire access roads must provide 20-foot minimum inside turning radius and 40 outside turning radius when said roads change direction. 4. Fire access roads shall not exceed 15% grade. 5. The required width of any fire apparatus access road shall not be obstructed in any manner, including parking of vehicles. Minimum required widths and clearances established under this section shall be maintained at all times. D. Marking when required, approved signs or other approved notices shall be provided and maintained for fire apparatus access roads to identify such roads and prohibit the obstruction thereof or both. Ref. IFC, Sections SOl through 503, 2003 edition Fire Systems Review Approval Conditions Page 2 of3 FH77 FINAL PLAT APPROVAL Final plat approval requires an inspection and approval of the fire hydrant and water main installation by a King County Fire Inspector, prior to recording. Call [888)546-7728 to schedule an inspection; after a permit to install has bee obntained from DOES; Fire Protection Engineering. Fire Systems Review Approval Conditions Page 3 of3 I King County Dept. of Development and Environmental SelVices Land Use Services Division 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 DATE: January 19, 2006 TO: Issaquah School District 411 REQUEST FOR SCHOOL INFORMATION PRELIMINARY PLATS FM: Cynthia Moffitt, Program/Project Manager III RE: Proposed Short Subdivision LUSD File No: L06P0001 -Cavalla Subdivision The Land Use Services Division (LUSD) has received an application for a subdivision in your District. Enclosed is a copy of the (revised) plat map received by the Land Use Services Division on January 12, 2006. In order for us to adequately evaluate this proposal, provide the most accurate information to the public, and for LUSD to serve the School District better, please provide us with the following information: Which schools do you anticipate the students living in this subdivision would attend? Elementary ___________________________ _ Jr. High/Middle _______________________ _ Sr. High, _________________________ _ Will the students walk or be bussed to these schools? Elementary ___________________________ _ Jr. High/Middle, _______________________ _ Sr. High, _________________________ _ If the students will be bussed, where do you anticipate the bus stops will be located? If that information is not available at this time, currently, where are the closest bus stops located to this site? Elementary ___________________________ _ Jr. High/Middle, _______________________ _ Sr. High __________________________ _ Other Comments: ___________________________ _ Please complete this form and return it by February 13, 2006 to the address below. If you have questions regarding this proposal, please call Trishah Bull at 206-296-6758. Thank you very much. King County Department of Development and Environmental Services Land Use Services Division ATTN: Trishah Bull / Program/Project Manager II 900 Oakesdale Avenue Southwest Renton, WA 98055-1219 • CHAD ARMOUR, LLC May 16, 2007 Mr. Curtis Schuster KBS Develo~ment Corporation 12320 NE 8' Street, Suite 100 Bellevue, Washington 98005 Subject: Conceptual Wetland Mitigation Plan Cavalla Preliminary Plat King County. Washington Dear Mr. Schuster: 6500126'" Avenue S.E. Bellevue, Washington 98006-3941 (425) 641-9743 (425) 643-3499 (fax) chad@chadarmour.com The following plan presents our approach to mitigating for unavoidable impacts to the buffer of a Category '" wetland. PROPOSED DEVELOPMENT PLAN KBS Development Corporation (Proponent) proposes to construct 34 single-family homes on the 9.4-acre Cavalla site (Figure 1). To do so, it will be necessary to construct a new road (162 nd Avenue SE). The road will impact a total of 887 square feet (sf) of Category III wetland buffer (Table 1 and Figure 2). We understand that the planned development is subject to the King County (County) Critical Areas regulations. We also understand that the Proponent proposes to make up for unavoidable impacts to the buffer using the Mitigation Reserves Program. CONCEPTUAL MITIGATION PLAN The plan is to: • Fill a portion of the wetland buffer; and • Pay the County a fee to create a 887 sf wetland buffer off of the site. EXISTING CONDITIONS According to B-12 Wetland Consulting (2004) a wetland is dominated by immature red alder (Alnus rubra) trees, salmonberry (Rubus spectabilis) shrubs, and lady fern (Athyrium filix-femina) is located off of the site near the southwest corner of the same. Based on our functional assessment, the wetland functions as a Category'" wetland (Attachment A). The buffer extends into the proposed 162nd Avenue SE right-of-way. Assuming that the provisions of KKC 21A.24.325A3b apply, constructing the road will unavoidably impact a total of 887 sf of wetland buffer. CONSTRUCTION PLAN \~'~ =; The plan is to pay the County the equivalent fee to enhance a degrad~ct;~i~ite'buffer covering 887 sf.-· '. .." C:lJobslBCE/Cavalia/Fee In-Lieu Letter.doc Chad Armour. LLC MAIN FILE COpy 05/16/07 --,....~ ,-. \ , . Cavalla Mitigation Plan King County, Washington a based on a drawing prepared by B-12 areas' b Assumes a 50 It buffer (exercise the buffer reduction option) Off-Site Buffer Enhancement We assume that: • It will be necessary to purchase urban land; KBS Development • A total of 12 trees and 24 shrubs will be installed in a degraded buffer at a rate of 0.041 plants/sf (Table 2); • A mixture of native herbaceous plant species will be broadcast seeded and hydroseeded on the degraded buffer; • 1 snag and 1 log will be installed in the degraded buffer; and • Compost will be added around each of the installed plants in a circle 3 ft in diameter and 3 inches (in) deep, and the site will be irrigated by way of a permanent irrigation system (Attachment B). MONITORING The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for monitoring the off-site buffer for at least three years following installation. The "fee-in-Iieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for monitoring associated with the proposed buffer fill and subsequent mitigation efforts. MAINTENANCE The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for maintenance of the off-site buffer during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for maintenance associated with the proposed buffer fill and subsequent mitigation efforts. C:/Jobs/BCE/Cavalia/Fee In-lieu Letter.doc Chad Armour, LLC 2 05/16/07 Cavalla Mitigation Plan King County, Washington KBS Development 887 sf; to be made up off site according to KKC 21A24.137 Resource Mitigation Reserve b total average density is 0.041 plants/sf CONTINGENCY PLAN The Proponent has included costs in the Mitigation Reserves Program "Fee-In-Lieu Worksheet" to allow for a contingency plan should deficiencies in the off-site buffer be discovered during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for contingency measures associated with the proposed buffer fill and subsequent mitigation efforts. SCHEDULE The Proponent anticipates paying the "Fee-In-Lieu" at the first available opportunity following the receipt of the necessary approvals from the County. We understand that this may be after Preliminary approval and prior to construction. LIMITATIONS Work for this project was performed, and this letter report prepared, in accordance with generally accepted professional practices for the nature and conditions of the work completed in the same or similar localities, at the time the work was performed. It is intended for the exclusive use of KBS Development Corporation and their assigns for specific application to the referenced property. This report is not meant to represent a legal opinion. No other warranty, express or implied, is made. It should be noted that mitigation planning is an inexact science. Biological professionals may disagree on the nature and extent of mitigation plans. Final acceptance of this mitigation plan is the responsibility of the permitting authority. Accordingly, the mitigation plan developed for this plat should be reviewed by the C:/Jobs/BCE/Cavalia/Fee In-Lieu Letter.doc Chad Armour, LLC 3 05/16/07 Cavalla Mitigation Plan King County, Washington KBS Development appropriate permitting authority prior to committing to detailed planning and design activities. Any questions regarding our work and this plan, the presentation of the information, and the interpretation of the data are welcome and should be referred to the undersigned. Sincerely, Chad Armour, LLC /J /} n ;1~,_ ~nl ±y4 Chad Armour Principal Attachments: Figure 1 -Vicinity Map Figure 2 -Site Plan Attachment A -Wetland Rating Form -Western Washington Attachment B -Mitigation Reserves Program, Fee-In-Lieu Worksheet cc: Wayne Potter, Barghausen Consulting Engineers Nick Gillen, King County DDES C:IJobslBCEICavalialFee In-Lieu Letter.doc Chad Armour, LLC 4 05116107 FIGURES ON TRAFFIC CONSULTANTS ~ t ' .. - j '" "'flIrt. I , --IlI-;----4, ~:";;.f.lJP1 ~r , .. ---.... ~~ TflREAllGILL J LIBERT" GARDENS· VICINITY tvi,I\P FIGURE 1 PLAT OF THREADGill CAVALlA LIBERTY GARDENS ~: I I I I I ~p I'AHC",_ t 'N1UI -AW; . fl":;C6;,:JCI2: I I /':'!~6~~~r~'; L:i:lt>OlC - "-I N -~~~~~-~~ , .. I : I I l I :, I ~ :,'1 " : I <", ~", "-;>6 I' :1 I I I ~I -." /', I ) \ , 33, /~t' MlNC . • J f\ Htl I<~' ~ '. 1 I ' ,~-:~~2> f-l£ / , }-)/ -~ " J J ~ J 31 !( ~ J' .~ 1 1 I I 3] IIj I ;;9 II! I I .. I j I'\. T{iACT '~y I I I • 1'U'LC fI04D A V . . , , / , " ... -. , I I IrJAC,' .J. S7"O{? .. t) ',POII;[) I Buffer Reduction Area / V (887 SF) ~ ~ \ 50' / f--Wetland " i>' , Buffer «' " I " I I i N .i" " Liberty --" , v ; I I / / I / ! FIGURE 2: SITE PLAN KBS-Cavalla Site King County, Washington OAT[: 05/16/07 10; 120m J J I I ls:-I I I I ~ -r, K'-I I "'-I f'.~,..;::" ) r',\~C.' • I ,~.j,,~: IJC(;SC~:'IlC , I !1 /;3Cb!:>CC')!~ I . j J , l~ " ;:J ~, ;'1 ~'-'>-~ , -<.~ ~~G' ~, V ;>0 • A ,"I,e . "" • '" "j Cavalla / :-H ~ 11'/le; 'H • {'A:'I{ -:TI!<~ , . .. " ~. , ~. '8 " I' • ~ 'nl,e-! "n' / , '3 • ,'I\e; '(' ~ 'C; " " . cA,"C"'j • V'&/!;o:J :,,~:. ~"I'OI'(>,'>~ ; f' f, 0"-:Hf'+lIY ~"T:r 'if-~I"_C<:;:~~; Gardens 0 Scale in ~" ;- 'I " . Itr' ~! I·~ '0 I: 100 200 II Feet II iJ/ Chad Armour, LLC 5500 126th Avenue SE Bellevue, Washington 98006 OW(; N,wE; G: \Projecl\ai~nt5\O'mour\K8S-162nd A~_CoYOllo_Threod9~I\Co"""!o02 d"9 ! " .., ~ :> ATTACHMENT A Wetland Rating Form Wetland name or number WETLAND RATING FORM -WESTERN WASHINGTON Version 2 -Updated July 2006 to increase accuracy and reproducibility among users Name of wetland (if known): Date of site visit: :lA"/<J;::;- Rated by U ... .£ Ar """<AI Trained by Ecology? Yes_No /Date oftraining, __ _ SEC: Ji TWNSHP: 2-} '" RNGE: Sf.-Is Sn'fR in Appendix D? Yes /NO_ Map of wetland unit: Figure __ Estimated size __ _ SUMMARY OF RATING Category based on FUNCPONS provided by wetland I II III / IV Category I = Score >=70 Category II = Score 5 1-69 Category III = Score 30-50 Category IV = Score < 30 Score for Water Quality Functions Score for Hydrologic Functions Score for Habitat Functions TOTAL score for Functions Category based on SPECIAL CHARAPERISTICS of wetland 1_ 11_ Does not Apply_/_ Final Category (choose the "highest" category from above) 1::1TI:1 Summary of basic information about the wetland unit None of the above Wetland Rating Form -western Washington version 2 Check if unit has multiple IIGM classes August 2004 Wetland name or number Does the wetland unit being rated meet any of the criteria below? If you answer YES to any of the questions below you will need to protect the wetland according to the regulations regarding the special characteristics found in the wetland. SPI. Has the wetland unit been documented as a habitat for any Federally listed Threatened or Endangered animal or plant species (TIE species)? For the purposes of this rating system, "documented" means the wetland is on the appropriate state or federal database. SP2. Has the wetland unit been documented as habitatfor any State listed Threatened or Endangered animal species? For the purposes of this rating system, "documented" means the wetland is on the appropriate state database. Note: Wetlands with State listed plant species arc categorized as Category J Natural Heritage Wetlands (see p. 19 of data form). SP3. Does the wetland unit contain individuals of Priority species listed by the WDFW for the state' SP4. Does the wetland unit have a local significance in addition to its functions? For example, the wetland has been identified in the Shoreline Master Program, the Critical Areas Ordinance, or in a local management plan as having special significance. To complete the next part ofthe data sheet you will need to determine the Hydrogeomorphic Class ofthe wetland being rated. The hydrogeomorphic classification groups wetlands into those that function in similar ways. This simplifies the questions needed to answer how well the wetland functions. The Hydrogeomorphic Class of a wetland can be determined using the key below. See p. 24 for more detailed instructions on classirying wetlands. Wetland Rating Fonn -western Washington version 2 2 August 2004 Wetland name or number Classification of Wetland Units in Western Washington 1. ~water levels in the entire unit usually controlled by tides (i.e. except during floods)? ~go to 2 YES -the wetland class is Tidal Fringe If yes, is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? YES -Freshwater Tidal Fringe NO -Saltwater Tidal Fringe (Estuarine) If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. Ifit is Saltwater Tidal Fringe it is rated as an Estuarine wetland. Wetlands that were called estuarine in the first and second editions of the rating system are called Salt Water Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and this separation is being kept in this revision. To maintain consistency between editions, the term "Estuarine" wetland is kept. Please note, however, that the characteristics that define Category I and II estuarine wetlands have changed (see p. ). 2. The entire wetland unit is Ilat and precipitation is the only source (>90%) of water to it. ~dwater and surface water runoff are NOT sources of water to the unit. d go to 3 YES -The wetland class is Flats If your wetland can be classified as a "Flats" wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet both of the following criteria? _The vegetated part of the wetland is on the shores ofa body of permanent open water (without any vegetation on the surface) at least 20 acres (8 hal in size; ~At least 30% of the open water area is deeper than 6.6 ft (2 m)? ~ go to 4 YES -The wetland class is Lake-fringe (Lacustrine Fringe) 4. Does the e6tire wetland unit meet all of the following criteria? -LtThe wetland is on a slope (slope can be very gradual), __ /The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetllow, or in a swale without /distinct banks. _1_ lThe water leaves the wetland witbout being imponnded? NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3ft ~and less than 1 foot deep). NO -go to 5 c.E!}7 The wetland class is Slope Wetland Rating Form ~ western Washington version 2 3 August 2004 Wetland name or number 5, Does the entire wetland unit meet all ofthe following criteria? __ The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river __ The overbank flooding occurs at least once every two years. NOTE: The riverine unit can contain depressions that are filled with water when the river is NO go to 6 YES -The wetland class is Riverine ~ot flooding. 6. s t e entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time during the year. This means that any outlet, if present, is higher than the interior of the wetl~, NO -go to 7 ~The wetland class is Depressional 7, Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding. The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. NO -go to 8 YES -The wetland class is Depressional 8, Your wetland unit seems to be difficult to classify and probably contains several different HGM clases. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPL Y TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identiry the appropriate class to use for the rating system if you have several HGM classes present within your wetland, NOTE: Use this table only ifthc class that is recommended in the second column represents \0% or more of the total area of the wetland unit being rated. If the area of the class listed in column 2 is less than 10% of the unit; classiry the wetland using the class that represents more than 90% of the total area, Salt Water Tidal Fringe and any other class offreshwater wetland Treat as ESTUARINE under wetlands with special characteristics If you are unable still to determine which of the above criteria apply to your wetland, or if you have more than 2 HGM classes within a wetland boundary, classiry the wetland as Depressional for the rating, Wetland Rating Form ~ western Washington version 2 4 August 2004 Wetland name or number D D D D D l. Does the wetland unit have the potential to improve water quality? D 1.1 Characteristics of surface water flows out of the wetland: Unit is a depression with no surface water leaving it (no outlet) points = 3 Unit has an intermittently flowing, OR highly constricted pennanently flowing outlet points = 2 Unit has an unconstricted, or slightly constricted, surface outlet (permanently flowing) points = I Unit is a "flaf' depression (Q_ 7 on key), or in the flats class, with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points = 1 (if ditch is not permanently flowing (real unit as "intermiltenlly flowing ") i S 1.2 The soil 2 inches below the surface (or duff layer) is clay or organic (use NRCS definitions) YES points ~ 4 NO D 1.3 Characteristics of persistent vegetation (emergent, shrub, andlor forest Cowardin class) Wetland has persistent, ungrazed, vegetation > ~ 95% of area points ~ 5 Wetland has persistent, ungrazed, vegetation > ~ 1/2 of area points ~ 3 Wetland ha, persistent, ungrazed vegetation > ~ 1110 of area points ~ I Wetland has persistent, ungrazed vegetation <1110 of area points ~ 0 D 1.4 Characteristics of seasonal ponding or inundation. This is the area of the wetland unit that is pondedfor at least 2 months, but dries out sometime during the year. Do not count the area thaI is permanently ponded. Estimate area as the average condition 5 out of J 0 yrs. Area seasonally ponded is > y, total area of wetland Area seasonally ponded is> y, total area of wetland Area seasonally ponded is < Y. total area of wetland points ~ 4 points ~ 2 points ~ 0 ~----------------~~~~~~~--/' D Total for D 1 Add the points in the boxes above ..5 ~--4-------------------------------------------------------------------------~"------D 02. Does the wetland unit have the opportunity to improve water quality? (see p. 44) D Answer YES if you know or believe there are pollutants in groundwater or surface water coming into the wetland that would otherwise reduce water quality in streams, lakes or groundwater down gradient from the wetland. Note which of the fallowing conditions provide the sources of pollutants. A unit may have pollutants coming from several sources, but any single source would qualifY as opportunity. -Grazing in the wetland or within] 50 ft ~ Untreated storm water discharges to wetland 7 Tilled fields or orchards within 150 ft of wetland A stream or culvert discharges into wetland that drains developed areas, residential areas, / farmed fields, roads, or clear-cut logging 1. Residential, urban areas, golf courses are within 150 ft of wetland Wetland is red by groundwater high in phosphorus or nitrogen Other is 2 NO is I TOTAL -Water Quality Functions Multiply the score from D I by D2 Add score to table on 1 Wetland Rating Form -western Washington version 2 5 August 2004 multiplier /0 Wetland name or number D D D D 3. Does the wetland unit have the potential to reduce flooding and erosion? D 3.1 Characteristics of surface water flows out of the wetland unit Unit is a depression with no surface water leaving it (no outlet) points = 4 Unit has an intermittently flowing, OR highly constricted permanently flowing outlet points ~ 2 Unit is a "flat" depression (Q. 7 on key), or in the Flats class, with permanent surface outflow and no obvious natural outlet and/or outlet is a man-made ditch points = I (If ditch is not permanently flowing treat unit a'l "intermittently flOWing") Unit has an' surface outlet D 3.2 Depth of storage during wet periods Estimate the height ofponding above the bottom of the outlet. For units with no outlet measure from the surface of permanent water or deepest part (ifdry). Marks of ponding are 3 ft or more above the surface or bottom of outlet points ~ 7 The wetland is a "headwater" wetland" points ~ 5 Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points ~ 5 Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points ~ 3 Unit is flat (yes to Q. 2 or Q. 7 on key) but has small depressions on the surface that trap water points ~ I Marks of less than 0.5 ft ~ 0 D 3.3 Contribution of wetland unit to storage in the watershed Estimate the ratio of the area of upstream basin contributing surface water to the wetland to the area of the wetland unit itself The area of the basin is less than 10 times the area of unit The area of the bas in is 10 to 100 times the area of the unit The area of the basin is more than 100 times the area of the unit points ~ 5 points ~ 3 points ~ 0 Entire unit is in the FLATS class ~ 5 ~~~~~~~~~~~~~~------------------------------------~~~~--,p--------D Total for D 3 D D 4. Does the wetland unit have the opportunity to reduce flooding and erosion? D Answer YES if the unit is in a location in the watershed where the flood storage, or reduction in water velocity, it provides helps protect downstream property and aquatic resources from flooding or excessive and/or erosive flows. Answer NO if the water coming into the wetland is controlled by a structure such as flood gate, tide gate, flap valve, reservoir etc. OR you estimate that more than 90% of the water in the wetland is from groundwater in areas where damaging groundwater flooding docs not occur. Note which of the following Indicators of opportunity apply. ~etland is in a headwater of a river or stream that has flooding problems --Wetland drains to a river or stream that has flooding problems Wetland has no outlet and impounds surface runoff water that might otherwise flow into a river or stream that has flooding problems NO ier is 1 TOTAL -Hydrologic Functions Multiply the score from D 3 by D 4 Add score to table on p. 1 Wetland Rating Fonn -western Washington version 2 6 August 2004 (see p. 49) multiplier /0, Pages 7 through 12 are not applicable Wetland name or number H 1. Does the wetland unit have the potential to provide habitat for many species? H 1.1 Vegetation structure (see p. 72) Check the types of vegetation classes present (as defined by Cowardin)-Size threshold for each class is lI, acre or more than 10% of the area ifunit is smaller than 2.5 acres. _"._ Aquatic bed __ Emergent plants __ Scrub/shrub (areas where shrubs have >30% cover) _ .. __ .~Forested (areas where trees have >300/0 cover) Ifthtit has aforested class check if The forested class has 3 out of 5 strata (canopy, sub-canopy, shrubs, herbaceous, moss/ground·cover) that each cover 20% within the forested polygon Add the number of vegetation structures that qualify. If you have: Map of Cowardin vegetation classes H 1.2. Hydroperiods (see p. 73) 4 structures or more 3 structures 2 structures structure points ~ 4 points ~ 2 points ~ 1 ~O Check the types c>lwater regimes (hydroperiods) present within the wetland The water regime has to cover morc than 10% of the wetland or 'l4 acre to count. (lee text for descriptions of hydroperiods) ___ Pennanently flooded or inundated 4 or more types present points ~ 3 __ Seasonally flooded or inundated 3 types present points ~ 2 __ /keasionally flooded or inundated 2 types present point ~ 1 I __ / SS,aturated only 1 type present points ~ 0 ~ermanently flowing stream or river in, or adjacent to, the wetland __ /. _ S Seasonally flowing stream in, or adjacent to, the wetland __ Lake-Jringe wetland = 2 points __ Freshwater tidal weiland = 2 points Map of hydroperiods H 1.3. Richness of Plant Species (see p. 75) Count the number of plant species in the wetland that cover at least 10 ft2 (different patches of the same species can be combined to meet the size threshold) You do not have to name the species. Do not include Eurasian Milfoil, reed canarygrass, purple loosestrife, Canadian Thistle If you counted: > 19 species points ~ 2 List species below if you want to: 5 -19 species points ~ I Wetland Rating Fonn -western Washington version 2 13 < 5 species points ~ 0 Total for page ~ August 2004 Wetland name or number H 1.4. Interspersion of habitats (see p. 76) Decide from the diagrams below whether interspersion between Cowardin vegetation classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, medium, low, or none, @· ···.·····o:,,··················.·.·· ",'--, . , .' , o None = 0 points Low ~ I point Moderate ~ 2 points [riparian braided channels] ~ 3 points NOTE: If you have four or more classes or three vegetation classes and open water the ratin is alwa s "hi h", Use rna of Cowardin ve elation classes H 1.5. Special Habitat Features: (see p. 77) Check the habitat/eatures that are present in (he wetland The number a/checks is the / number of points you put into the next column. ~Ifirge, downed, woody debris within the wetland (>4in. diameter and 6 ft long). _/_"Stt,anding snags (diameter at the bottom> 4 inches) in the wetland __ Undercut banks are present for at least 6.6 ft (2m) and/or overhanging vegetation extends at least 3.3 ft (1m) over a stream (or ditch) in, or contiguous with the unit, for at least 33 ft (10m) __ Stable steep banks of fine material that might be used by beaver or muskrat for denning (>30degree slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet turned grey/brown) __ At least 1;4 acre of thin-stemmed persistent vegetation or woody branches are present in areas that are permanently or seasonally inundated. (structures/or egg-laying by amphibiam) __ Invasive plants cover less than 25% of the wetland area in each stratum of plants igure_ NOTE.-The 20% stated in early printings 0/ (he manual on page 78 is an error. ~--------------~~-~~~------~-=-------------------1--------- H l. TOTAL Score -potential for providing habitat ~ I '--_____________ A=dd::.;.:.t h:.::e.::.s:::::co",r.o:e::...s L:..r",o",m:...:}-'.Jl:..:..-,-,l ,,-,1-'.1:..:.1.=-2 ,,-,H'-'-'-C1.c::.3,-,, H'-'-'.1':...:4,--, ,-,Hc:.1",. 5---,1... ____ J Comments Wetland Rating Form -western Washington version 2 14 August 2004 Wetland name or number H 2. Does the wetland unit have the opportunity to provide habitat for many species? H 2.1 Buffers (seep. 80) Choose the description that best represents condition of buffer of wetland unit. The highest scoring criterion that applies to the wetland is to be used in the rating. See text for definition of "undisturbed. " -100 m (330ft) of relatively undisturbed vegetated areas, rocky areas, or open water >95% of circumference. No structures are within the undisturbed part of buffer. (relatively undisturbed also means no-grazing, no landscaping, no daily human use) Points = 5 -~O m (330 ft) of relatively undisturbed vegetated areas, rocky areas, or open water> I:~% circumference. Points = 4 -50 m (J 70ft) of relatively undisturbed vegetated areas, rocky areas, or open water >95% circumference. Points = 4 -100 m (330ft) of relatively undisturbed vegetated areas, rocky areas, or open water> 25% circumference, . Points = 3 -50 m (170ft) of relatively undisturbed vegetated areas, rocky areas, or open water for> 50% circumference. Points == 3 If buffer does nol meet any of the crileria above -No paved areas (except paved trails) or buildings within 25 m (SOft) of wetland > 95% circumference. Light to moderate grazing, or lawns are OK. Points == 2 -No paved areas or buildings within 50m of wetland for >50% circumference. Light to moderate grazing, or lawns are OK. Poinls = 2 -Heavy grazing in buffer. Points = I -Vegetated buffers are <2m wide (6.6ft) for more than 95% of the circumference (e.g. tilled fields, paving, basalt bedrock extend to edge of wetland Points = O. -Buffer does not meet any of the criteria above. Poinls = I Aerial photo showinQ buffers H 2.2 Corridors and Connections (see p. 81) H 2.2.1 Is the wetland part of a relatively undisturbed and unbroken vegetated corridor (either riparian or upland) that is at least 150 ft wide, has at least 30% cover of shrubs, forest or native undisturbed prairie, that connects to estuaries, other wetlands or undisturbed uplands that arc at least 250 acres in size? (dams in riparian corridors, heavily used gravel roads, paved roads, are considered breaks in the corrid~' . YES = 4 points (go to H 2.3) NO go to H 2.2.2 H 2.2.2 Is the wetland part of a relatively undisturbed an n roken vegetated corridor (either riparian or upland) that is at least 50ft wide, has at least 30% cover of shrubs or forest, and connects to estuaries, other wetlands or undisturbed uplands that are at least 25 acres in size? OR a Lake-fringe wetland, if it does not have an undisturbed corridor as in the QUeSliOev ? YE poinls (go to H 2.3) NO ~ H 2.2.3 H 2.2.3 Is t e wetland: within 5 mi (Skm) of a brackish or salt water estuary OR within 3 mi of a large field or pasture (>40 acres) OR within I mi of a lake greater than 20 acres? YES ~ I point NO ~ 0 points FIgure_ Total for page 6 Wetland Rating Form -western Washington version 2 15 August 2004 Wetland name or number H 2.3 Near or adjacent to other priority habitats Iistcd by WDFW (see p. 82) Which of the following priority habitats are within 330ft (100m) of the wetland unit? NOTE: the to neetions do not have to be relatively undisturbed 7: ese are DFW definitions. Check with your local DFW biologist if there are any questions. _ _Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. __ Aspen Stands: Pure or mixed stands of aspen greater than O.S ha (2 acres). __ Cliffs: Greater than 7.6 m (25 ft) high and occurring below 5000 ft. __ Old-growth forests: (Old-growth west of Cascade crest) Stands of at least 2 tree species. forming a multi-layered canopy with occasional small openings; with at least 20 trees/ha (S trees/acre) > 81 em (32 in) dbh or> 200 years of age. __ Mature forests: Stands with average diameters exceeding 53 em (21 in) dbh; crown cover may be less that 100%; crown cover may be less that 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old- growth; 80 -200 years old west of the Cascade crest. __ Prairies: Relatively undisturbed areas (as indicated by dominance of native plants) where grasses and/or forbs form the natural climax plant community. __ Talus: Homogenous areas of rock rubble ranging in average size 0.15 -2.0 m (0.5 -6.5 ft), composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May be associated with cliffs. __ Caves: A naturally occurring cavity, recess, void, or system of interconnected passages __ Oregon white Oak: Woodlands Stands of pure oak or oak/conifer associations where canopy coverage of the oak component of the stand is 25%. __ Urban Natural Open Space: A priority species resides within or is adjacent to the open space and uses it for breeding and/or regular feeding; and/or the open space functions as a corridor connecting other priority habitats, especially those that would otherwise be isolated; and/or the open space is an isolated remnant of natural habitat larger than 4 ha (10 acres) and is surrounded by urban development. __ Estuary/Estuary-like: Deepwater tidal habitats and adjacent tidal wetlands, usually semi- enclosed by land but with open, partly obstructed or sporadic access to the open ocean, and in which ocean water is at least occasionally diluted by freshwater runoff from the land. The salinity may be periodically increased above that of the open ocean by evaporation. Along some low-energy coastlines there is appreciable dilution of sea water. Estuarine habitat extends upstream and landward to where ocean-derived salts measure less than 0.5ppt. during the period of average annual low flow. Includes both estuaries and lagoons. Marine/Estuarine Shorelines: Shorelines include the intertidal and subtidal zones of beaches, and may also include the backshore and adjacent components of the terrestrial landscape (e.g., cliffs, snags, mature trees, dunes, meadows) that are important to shoreline associated fish and wildlife and that contribute to shoreline function (e.g., sand/rock/log recruitment, nutrient contribution, erosion control). If wetland has 3 or more priority habitats = 4 points If wetland has 2 priority habitats ~ 3 points If wetland has I priority habitat = I poinl No habitats = 0 points Note: All vegetated wetlands are by definition a priority habitat but are not included in this list. Nearbv wetlands are addressed in question H 2.4) Wetland Rating Form -western Washington version 2 16 August 2004 Wetland name or number H 2.4 Wetland Landscape (choose the one description a/the landscape around the wetland that best fits) (see p. 84) There are at least 3 other wetlands within 'j, mile, and the connections between them are relatively undisturbed (light grazing between wetlands OK, as is lake shore with some boating, but connections should NOT be bisected by paved roads, fill, fields, or other development. points ~ 5 The wetland is Lake-fringe on a lake with little disturbance and there are 3 other lake-fringe wetlands within 'j, mile points ~ 5 There are at least 3 other wetlands within 'I, mile, BUT the connections between them are disturbed points ~ 3 The wetland is Lake-fringe on a lake with disturbance and there are 3 other lake-fringe wetland within 1;'2 mile points ~ 3 There is at least I wetland within II, mile. points ~ 2 There are no wetlands within 1;2 mile. points ~ 0 H 2. TOTAL Score -opportunity for providing habitat Add the scores from H2.1,H2.2, H2.3, H2.4 TOTAL for H I from page 14 Total Score for Habitat Functions -add the points for HI, H 2 and record the result on Wetland Rating Form -western Washington version 2 17 p. 1 August 2004 -3 ----- I j() I --------~ ---~. J~ Wetland name or number CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS Please determine if the wetland meets the attributes described below and circle the appropriate answers and Category. r,crit,,'rilJ',that apply to the wetland. Circlethe Cqtegory wf/,elrfhe SC 1.0 Estuariue wetlands (see p. 86) Does the wetland unit meet the following criteria for Estuarine wetlands? -The dominant water regime is tidal, -Vegetated, and -With a salinity greater than 0.5 ppt. YES = Go to SC 1.1 NO~ SC 1.1 Is the wetland unit within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151? I NO 1.2 SC 1.2 Is the wetland unit at least I acre in size and meets at least two of the following three conditions~ YES = Category 1 NO = Category II -The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has less than 10% cover of non-native plant species. If the non-native Spartina spp. are the only species that cover more than 10% of the wetland, then the wetland should be given a dual rating (1/11). The area of Sparlina would be rated a Category II while the relatively undisturbed upper marsh with native species would be a Category I. Do not, however, exclude the area of Sparlina in determining the size threshold of I acre. -At least Y. of the landward edge of the wetland has a IDa ft buffer of shrub, forest, or un-grazed or un-mowed grassland. -The wetland has at least 2 of the following features: tidal channels, depressions with open water, or contiguolls freshwater wetlands. Wetland Rating Form -western Washington version 2 18 August 2004 Cat. I Cat. I Cat. II Uual rating 1111 Wetland name or number SC 2.0 Natural Heritage Wetlauds (seep. 87) Natural Heritage wetlands have been identified by the Washington Natural Heritage ProgramlDNR as either high quality undisturbed wetlands or wetlands that support state Threatened, Endangered, or Sensitive plant species. SC 2. I Is the wetland unit being rated in a SectionffownshiplRange that contains a Natural Heritage wetland? :Y:is queslion is used 10 screen oul mosl siles before you need 10 contac:;r,;;HP/DNR) S!f1R information from AppendIX D _ or accessed from VlNHPiDNR web sIte _ YES __ -contact WNHPIDNR (see p. 79) and go to SC 2.2 NO SC 2.2 Has DNR identified the wetland as a high quality undisturbed wetland or as or as a site with state threatened or endangered plant speci~ YES = Category I NO __ not a Heritage Wetland SC 3.0 Bogs (see p. 87) Does the wetland unit (or auy part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below 10 identifY if Ihe wetland is a bog. If yau answer yes you will still need to rate the wetland based on its functions. I. Does the unit have organic soil horizons (i .e. layers of organic soil), either peats or mucks, that compose 16 inches or more of the first 32 inches of the soil profile? (See Appendix B for a field key to identifY organic soils)? Yes- go to Q. 3 No -go to Q. 2 2. Does the unit have organic soils, either peats or mucks that are less than 16 inches deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on a lake or pond? Yes -go to Q. 3 No -Is not a bog for purpose of rating 3. Does the unit have more than 70% cover of mosses at ground level, AND other plants, if present, consist ofthe "bog" species listed in Table 3 as a significant component of the vegetation (more than 30% of the total shrub and herbaceous cover consists of species in Table 3)? Yes -Is a bog for purpose of rating No -go to Q. 4 NOTE: If you are uncertain about the extent of mosses in the understory you may substitute that criterion by measuring the pH of the water that seeps into a hole dug at least 16" deep. If the pH is less than 5.0 and the "bog" plant species in Table 3 are present, the wetland is a bog. 1. Is the unit forested (> 30% cover) with sitka spruce, subalpine fir, western red cedar, western hemlock, lodgepole pine, quaking aspen, Englemann's spruce, or western white pine, WITH any of the species (or combination of species) on the bog species plant list in ~~:.!7, 3 as a significant component of the ground cover (> 30% coverage Of7:_lolal shrub/herbaceous cover)? 2. YES = Category I No_ Is not a bog for purpose of rating Wetland Rating Form -western Washington version 2 19 August 2004 Cat. I Cat. I Wetland name or number . '~." ' ..... - SC 4.0 Forested Wetlands (see p. 90) Does the wetland unit have at least I acre of forest that meet one of these criteria for the Department ofFish and Wildlife's forests as priority habitats? lfyou answer yes you will still need to rale the wetland based on its junctions. -Old-growth forests: (west of Cascade crest) Stands of at least two tree species, forming a multi-layered canopy with occasional small openings; with at least 8 trees/acre (20 trees/hectare) that are at least 200 years of age OR have a diameter at breast height (dbh) of32 inches (81 cm) or morc. NOTE: The criterion for dbh is based on measurements for upland forests. Two-hundred year old trees in wetlands will often have a smaller dbh because their growth rates are often slower. The DFW criterion is and "OR" so old-growth forests do not necessarily have to have trees of this diameter. -Mature forests: (west ofthe Cascade Crest) Stands where the largest trees are 80 -200 years old OR have average diameters (dbh) exceeding 21 inches (53cm); crown cover may be less that 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old-growth. ~ YES ~ Category I NO not a forested wetland with special characteristics SC 5.0 Wetlands in Coastal Lagoons (see p. 91) Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? -The wetland lies in a depression adjacent to marine watcrs that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks -The lagoon in which the wetland is located contains surface water that is saline or brackish (> 0.5 ppt) during ~osofthe year in at least a portion of the lagoon (needs to be measured n r the hottom) YES ~ Go to SC 5.1 NO_' not a wetland in a coastal lagoon SC 5.1 Does the wetland meets all of the following three conditions? -The wetland is relatively undisturbed (has no diking, ditching, tilling, cultivation, grazing), and has less than 20% cover of invasive plant species (see list of invasive species on p. 74). -At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un-mowed grassland. -The wetland is larger than 1110 acre (4350 square feet) YES = Category 1 NO = Category II Wetland Rating Form -western Washington version 2 20 August 2004 Cat. I Cat. I Cat. II Wetland name or number SC 6.0 Interdunal Wetlands (see p. 93) Is the wetland unit west ofthe 1889 line (also caZle the Western Boundary of Upland Ownership or WBUO)? YES -go to SC 6.1 NO~' not an interdunal wetland for rating If you answer yes you will still need to rate the wetland based on its functions. In practicaltenns that means the following geographic areas: • Long Beach Peninsula-lands west of SR 103 • Grayland-Westport-lands west of SR 105 • Ocean Shores-Copalis-lands west of SR 115 and SR 109 SC 6.1 Is the wetland one acre or larger, or is it in a mosaic of wetlands that is once acre or larger? YES = Category II NO -go to SC 6.2 Cat. II SC 6.2 Is the unit between 0.1 and I acre, or is it in a mosaic of wetlands that is between 0.1 and 1 acre? YES = Category III Wetland Rating Form -western Washington version 2 21 August 2004 Cat. III ATTACHMENT B Mitigation Reserve Program Fee-in-Lieu Worksheets ® Mitigation Reserves Program Fee-In-Lieu Worksheet DOES Permlt# Cavalla King County Dale-5/10/2007 Prepared by: Chad Armour, LLC PLANT MATERIALS' Type Unit Price Unit Quantity Description Cost PLANTS. Potted, 4' diameter, medium $5.0 Each 12.0C $ 60.00 PLANTS. Container, 1 galion, medium soil $11.5 Each 12.00 $ 138.00 PLANTS: Container, 2 gallon, medium soil $20.0 Each 12.0C $ 240.00 PLANTS Container. 5 gallon, medium soil $36.0 Each $ - PLANTS Seeding, by hand $0.50 SY 49.00 444 sf $ 24.50 PLANTS Slips (willow, red-osier) $2.00 Each $ PLANTS Slakes (willow) $2.00 Each $ - • All casts include installation I TOTAL $ 462.50 INSTALLATION COSTS ( LABOR, EQUIPMENT, & OVERHEAD) Type Unit Price Unit Cost Compost, vegetable. delivered and spread $37.88 CY 3.00 3 ft fad around ea plant; 3 in dee $ 113.64 Decompacting tiIVhar~an. medium. to 6' depth $1.57 CY $ Decompaciing lilVhar~an. medium, to 12' depth $1.57 CY $ - F ertiliZ8. slow release lablets, 30gmltree $3.21 Each $ Hyctoseedmg $0.51 SY 49.00 444 sf $ 24.99 labOf, general {landscapmg} $25.OC HR $ labor, general (constructkln) $37.00 HR 16.0 BB? sf (0.02 ac) $ 592.00 labor' Consu~ant, supervising $55.00 HR 10.00 887 sf (0.02 acl $ 550.00 labor ConslJ~anl. on-sae re-desI9f1 $9500 HR $ - Refltal of decompacting machiflery & operator $70.65 HR $ Safld, coarse bu~der's, delivered and spread $42.06 CY $ - Staking material (sel per tree) $7.00 Each 12.0 $ 84.00 Surveying, line & grade $250.00 HR $ - SurveYing, topographical $250.0 HR 8.00 $ 2.000.00 Watering, I' of water. 50' soaker hose $3.62 MSF $ - Irrigatiofl temporary $3.000.0 Acre $ - Irrigation· buried $4.500.0 Acre 0.02 $ 90.00 Hting lopso~, disk harrow, 20hp tractor, 4'.fl' deep $1.02 SY $ - TOTAL $ 3,454.63 HABITAT STRUCTURES' ITEMS Unit Cost Unit Cost Fascines ("";lIow) $ 2.00 Each $ - Logs, (cedar), w' root wad$, 16'·24· <iam., 30'Iong $1.000.0( Each 1.00 $ 1,000.00 Logs (cedar) via root wads, 16·-24' oam .. 30' $400.0C Each $ - Logs, via rool 'r\Iads, 16··24' dam., 30'/ong $245.0C Each $ Logs wf root wads, IS'·24·dam 30'Iong $460.0C Each $ - Rocks, one-rnan $60.00 Each $ - Rocks, two-man $120.0C Each $ - Roolwads $163.0C Each $ Spawning gravel. type A $22.00 CY $ - Weir -log $1,5000< Each $ We~ -adjustable $2.000.0< Each $ - Woody debris. large $163.0 Each $ - Snags ~anchored $400.0 Each 1.00 $ 400.00 Snags· on site $50.0C Each $ Snags -impOfted $800.0 Each $ - • All costs Include delivery ITOTAL $ 1,400.00 EROSION CONTROL ITEMS Unit Cost Unit Cost Backfill and Compacjion-embankment $ 4.89 CY $ - Crushed sur1acing, 1114' minus $30.0( CY $ - Dnching $7.0 CY $ - Excavation, bulk $4.0C CY $ - Fence, siH $1.6C LF 30.00 887 sf (0.02 ac) $ 48.00 Jute Mesh $1.26 SY $ - Mulch. by hand, straw. 2' deep $1.2 SY $ - Mulch, by hand, mod chips, 2' deep $3.2, SY $ - Mulch, by machine, straw, I' deep $0.32 SY $ - Piping, temporary, CPP, 6' $9.3C LF $ Piping, temporary. CPP, 8' $14.00 LF $ Piping, temporary, CPP, 12' $18.00 LF $ - PlastiC covering, 6mm thick, sandbagged $2.00 SY $ Rp Rap, machine placed, slopes $33.98 CY $ Rock Constr Entrance 100'xI5'xl' $3,000,00 Each $ - Rock Canstr. Entrance 50'xlS,):I' $1,500 00 Each 0.33 8B7 sf (0.02 ae) $ 495.00 Sedmeflt pond riser assembly $1,695.11 Each $ Sedlrrtent trap, 5' hgh berm $15.57 LF $ Sediment trap, 5' high berm w/spilway inc!. riprap $59.60 LF $ Sodding, I' deep,level ground $5.24 SY $ - Sodding, I' deep, sloped ground $6.48 SY $ - Straw bales, place and remove $600.0 TON $ - Hauling and disposa I $20.00 CY $ TopsOIl. delivered and spread $35.73 CY $ I TOTAL $ 543.00 GENERAL ITEMS ITEMS Unit Cost Unit Cost Fencing, chain link, 6' high $18.8E LF $ FenCing. chain hnk. corner posts $111.1 Each $ Fencing, chain link. gate $277.6 Each $ - FenCing, spin rail, 3' high (2-faiJ) $10.54 LF 30.00 887 sf (0.02 ac) $ 316.20 Fenclflg, temporary (NGPE) $1.20 LF $ Signs, sens~ive area boundary $2.50 Each 1.00 $ 2.50 I TOTAL $ 318.70 OTHER ITEMS IMI~INTEr~MJCE AND MONTIORING Mainlenance and Monrtoring Inspeclion, fmal LAND COSTS LONG TERM SITE MANAGEMENT MITIGATION RESERVES PROGRAM ADMINISTRATION COSTS $ • cost Projects I i I permit requirements may longer monitoring and maintenance terms. TI1is will be evaluated on a case-by- case basis for development appllcatlon~ Monitoring and maintance ranges may 5 to 10 EACH EACH Total $ 6.178.83 160.00 289.80 579.60 $ 1,120.00 $ 1,700.00 $20,469.18 CHAD ARMOUR, LLC 6500126'" Avenue S.E. Bellevue, Washington 98006-3941 (425) 641-9743 (425) 643-3499 (fax) chad@chadarmour.com May 16, 2007 Mr. Dave Petrie 811 South 273rd Court De Moines, Washington 98198 Subject: Conceptual Wetland Mitigation Plan (revised) Liberty Gardens Preliminary Plat (L04P0034) King County, Washington Dear Mr. Petrie: We revised our conceptual mitigation plan based on information provided to us by Mr. Nick Gillen in the meeting we had on February 28, 2007 and the fee-in-lieu spreadsheet on March 14, 2007. As you will recall, we chose the fee-in-lieu option to mitigate for unavoidable impacts to wetlands because the area available on the site for mitigation is the location of a mature forest. The following describes our approach in revising the conceptual mitigation plan including the estimated cost to construct a wetland off of the site. PROPOSED DEVELOPMENT PLAN Mr. Dave Petrie (Proponent) proposes to construct 37 single-family homes on the 8.95- acre Liberty Garden site (see Preliminary Plat of Liberty Gardens). To do so. it will be necessary to construct new roads and storm management facilities (see Preliminary Grading and Storm Drainage Plan of Liberty Gardens). The road will impact a total of 2,387 square feet (sf) of Class 2 wetland and 14,840 sf of buffer (Table 1 and Preliminary Plat of Liberty Gardens). It will also impact an intermittent stream that flows through one of the wetlands and across the site. We understand that the planned development is vested under the King County Sensitive Areas regulations. CONCEPTUAL MITIGATION PLAN The proposed mitigation plan is to: • Protect a portion of the wetland associated with the intermittent stream; • Protect the intermittent stream; • Protect the associated buffer; • Fill a portion of two wetlands and associated buffer; • Increase the width of buffer adjacent to wetland adjacent to the stream to make up for lost buffer; -, - • ,-, I Enhance the buffer makeup areas; and u. . • Pay the County a fee to create a 7,161 sf wetland off of the site. ',; C:/JobsfBCE/Petrie/Fee In-Lieu Letter(revised).doc 1 Chad Armour, LLC MAIN FILE COpy ,:-. 05/16/07 c::, . ii' ~(,fb4't:)1 Liberty Garden Revised Mitigation Plan King County, Washington Table 1 -Wetland and buffer im and areas a , based on Preliminary Grading Plan (revised) 01 Liberty Gardens b 96151 + 1,426 sl • , to be made up according to KKC 21A.24.137 Resource Mitigation Reserve d 8,379s1 + 6,207sl+ 25451 EXISTING CONDITIONS Mr. Dave Petrie According to 8-12 Wetland Consulting (2004) and our observations over the last several years, the upland forest is composed of an overstory of mature big-leaf maple (Acer macrophyl/um), red alder (Alnus rubra), western red cedar (Thuja plicata), Douglas-fir (Pseudotsuga menziesil), and western hemlock (Tsuga heterophyl/a). The understory supports salmonberry (Rubus spectabilis), Indian plum (Oemleria cerasiformis), hazel nut (Corylus cornuta), sword fern (Polystichum munilum), salal (Gaultheria shal/on), and bracken (Pteridium aquilinum). Wetland AlB (Southern Wetland) The southern wetland is a Class 2 wetland that consists of a narrow strip of forest adjacent to a Class 3 intermittent stream (8-12 Wetland Consulting, 2004). The wetland supports an overstory of red alder and black cottonwood (Populus balsamifera) trees. The understory supports salmonberry, lady fern (Athyrium filix-femina), and tall mannagrass (Glyceria elata). Wetland C (Northern Wetland) The northern wetland is a Class 2 wetland dominated by immature red alder trees, salmonberry shrubs, and lady fern (8-12 Wetland Consulting, 2004). Mature Trees In the Reduction and Makeup Areas As indicated on Table 2 and the Significant Tree Retention Plan of Liberty Gardens, 20 medium-to large-sized deciduous and conifer trees will be lost due to the proposed development. To offset this loss, a total of 21 medium-to large-sized deciduous and conifer trees will be protected in buffer makeup areas. C:lJobs/BCE/Petrie/Fee In-Lieu Letter(revised).doc 2 Chad Armour, LLC 05/16/07 Liberty Garden Revised Mitigation Plan King County, Washington , see Significant Tree Retention Plan for details CONSTRUCTION PLAN • Mr. Dave Petrie We developed this plan to mitigate for lost wetland and buffer area and functions by assuming that a 7,161 sf wetland will be created off of the site and 14,840 sf buffer will be enhanced on the site. We used the general guidance for completing fee-in-lieu worksheet for offsite mitigation construction costs (Attachment A) to determine the materials and labor to construct a wetland (King County, Undated). Table 3 illustrates the suggested plants and habitat amenities to be installed in the created wetland and enhanced buffer. Off-Site Wetland Creation We assume that: • It will be necessary to purchase urban land; • A total of 92 trees and 205 shrubs will be installed in the created wetland at a rate of 0.041 plants/sf (Table 3); • A mixture of native herbaceous plant species will be broadcast seeded on the wetland creation area; • 9 snags and 6 logs will be installed in the wetland creation area; and • It will take 4 hours to deconsolidate the soil, compost will be added around each of the installed plants in a circle 3 feet (It) in diameter and 3 inches (in) deep, and the site will be irrigated by way of a permanent irrigation system (Attachment A). On-Site Buffer Enhancement In the buffer enhancement areas, we assume that machine encroachment will be limited to trackhoe excavators used to install snags and place logs. We assume that the crushed shrubs and herbs will recover. We also assume that: • A total of 38 western red cedar trees will be installed 20 It on center to increase the density of conifer trees in the buffer make up areas; C:IJobslBCEIPetrielFee In-Lieu Letter(revised).doc 3 Chad Armour. LLC 05116107 • Liberty Garden Revised Mitigation Plan Mr. Dave Petrie King County, Washington Wetland Buffer 41 4 various 41 41 slolonifera various 41 41 o Malus fusca various 41 41 o seed broadcast x x great Slachys seed broadcast x x large-leaved Geum avens seed broadcast x x tall • 7,161 sf; to be made up off site according to KKC 21A24.137 Resource Mitigation Reserve b 15,004 sf; to be made up and enhanced on-site C:/Jobs/BCEIPetrie/Fee In-Lieu Letter(revised).doc 4 Chad Armour, LLC 05/16/07 ---------- Liberty Garden Revised Mitigation Plan King County, Washington Mr. Dave Petrie • It will not be necessary to install shrubs and herbs because a dense layer of shrubs and a robust assemblage of herbs are present in the buffer enhancement areas; • 19 snags and 15 logs will be installed; • The snags and logs will come from trees harvested on the site; • A signed split-rail fence will protect the Southern Wetland, the intermittent stream, and associated buffers. MONITORING The Proponent will monitor the on-site mitigation areas for at least three years following installation in the summer. The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for monitoring the off-site wetland for at least three years following installation. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for monitoring associated with the proposed wetland fill and subsequent mitigation efforts. MAINTENANCE The Proponent will maintain on-site mitigation area as follows: • Remove weeds for three years after installation. Weeds include non-native vegetation, particularly Himalayan blackberry, reed canarygrass, and evergreen blackberry; and • Replace trees that die during the 3-year monitoring program to maintain the minimum 80 percent survival rate. The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for maintenance of the off-site wetland during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for maintenance associated with the proposed wetland fill and subsequent mitigation efforts. CONTINGENCY PLAN If there is difficulty achieving the performance standards on the site, the Proponent proposes to work with the County to develop a contingency plan. Contingency plans can include, but are not limited to: additional plant installation and plant substitutions of type, size, quantity, and location. Such a contingency plan shall be submitted to the County by December 1 sl of any year when deficiencies are discovered. The Proponent has included costs in the Mitigation Reserves Program "Fee-In-Lieu Worksheet" to allow for a contingency plan should deficiencies in the off-site wetland be discovered during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for contingency measures associated with the proposed wetland fill and subsequent mitigation efforts. C:lJobs/BCElPetrie/Fee In-Lieu Letter(revised).doc 5 Chad Armour, LLC 05/16/07 Liberty Garden Revised Mitigation Plan King County, Washington SCHEDULE Mr. Dave Petrie The Proponent anticipates executing this plan at the first available opportunity following the receipt of the necessary approvals from the County. Assuming construction occurs the summer of 2007, the first monitoring event will occur the following spring. The Proponent will submit a monitoring report as indicated previously. Maintenance will occur within four months following submission of the monitoring report. Subsequent monitoring, reporting, and maintenance will follow the same schedule during the subsequent years. LIMITATIONS Work for this project was performed, and this mitigation plan prepared, in accordance with generally accepted professional practices for the nature and conditions of the work completed in the same or similar localities, at the time the work was performed. It is intended for the exclusive use of Mr. Dave Petrie and his assigns for specific application to the referenced property. This report is not meant to represent a legal opinion. No other warranty, express or implied, is made. It should be noted that wetland mitigation planning is an inexact science. Biological professionals may disagree on the nature and extent of mitigation plans. Final acceptance of this wetland mitigation plan is the responsibility of the permitting authority. Accordingly, the wetland mitigation plan developed for this plat should be reviewed by the appropriate permitting authority prior to committing to detailed planning and design activities. REFERENCES B-12 Wetland Consulting, Inc. 2004. Liberty Gardens Critical Areas Analysis Area Report & Conceptual Mitigation Plan, King County WA. Prepared for Mr. Dave Petrie, 811 S. 273'd Ct., Des Moines, WA 98198. King County. Undated. Mitigation Reserves Program, Fee-In-Lieu Worksheet. C:IJobs/BCE/Petrie/Fee In-lieu Letter(revised).doc 6 Chad Armour, LLC 05/16/07 Liberty Garden Revised Mitigation Plan King County, Washington Mr. Dave Petrie Any questions regarding our work and this plan, the presentation of the information, and the interpretation of the data are welcome and should be referred to the undersigned. Sincerely, Chad Armour, LLC CJ,,t4~ Chad Armour Principal Attachments: Figure 1 -Vicinity Map Figure -Preliminary Plat Map of Liberty Gardens Figure -Preliminary Grading and Storm Drainage Plan of Liberty Gardens Figure -Significant Tree Retention Plan of Liberty Gardens Attachment A -Mitigation Reserves Program, Fee-In-Lieu Worksheet cc: Wayne Potter, Barghausen Consulting Engineers Nick Gillen, King County DOES C:lJobs/BCE/Petrie/Fee In-Lieu Letter(revised).doc 7 Chad Armour, LLC 05/16107 FIGURES DN TRAFFIC CONSUL TANTS I J ! -----!.!;cH- i , LIBERTY GARDENS , . SF.. I.nnnSL .. . i VICINITY MAP FIGURE 1 PLAT OF THREADGILL CAVALLA LIBERTY GARDENS ATTACHMENT A Mitigation Reserve Program Fee-in-Lieu Worksheets ® Mitigation Reserves Program Fee-In-Lieu Worksheet L04P0034 ODES Permlt# King County Dale 5/16/2007 Prepared by: Chad Armour, LLC PLANT MATERIALS' Type Unit Price Unit Quantity Description Cost PLANTS: Potted, 4' diameter, medium $5.0C Each $ PLANTS: Container. 1 gallon, medium soil $11.5C Each 74.0C $ 851.00 PLANTS' Container, 2 gallon, medium soil $20.0C Each 74.0 $ 1,480.00 PLANTS Contamer,5 gallon, medium soil $36.00 Each 74.00 $ 2,664.00 PLANTS. Seeding, by hand $0.50 SY 795.00 7,161 sf $ 397.50 PLANTS Sips (wlilow, red-osier) $2.0 Each 74.0 $ 148.00 PLANTS Stakes (willow) $2.0 Each $ • All costs include installation I TOTAL $ 5,540.50 INSTALLATION COSTS ( LABOR, EQUIPMENT, & OVERHEAD) Type Unit Price Unit Cost Compost, vegetable, deli'o'ered and spread $37.88 CY 20.00 3 ft (ad around ea plant; 3 in deep $ 757.60 Oecompac1mg iilVhardpan, medium, to 6' depth $1.57 CY 150.00 $ 235.50 Oecompacling tiWhardpan, medium, to 12' depth $1.57 CY $ - Fertilize. slow release tablets, 30gmltree $3.21 Each $ - Hydroseedmg $0.51 SY 0.00 hand seeded $ - labor, general (Ia ndscapll1g) $25.00 HR $ labor, general (construction) $37.00 HR 16.00 7,161 sf (0.16 ac) $ 592.00 labor ConsuHant, supervising $55.OC HR 10.00 7.161 sf(0.16ac) $ 550.00 Labor. ConsuHant, on-srte re-design $95.OC HR $ - Rental of decompacting machinery & operalor $70.65 HR 6.00 assumed $ 423.90 Sand, coarse builde~s. delivered and spread $42.06 CY $ - Staking material {set per tr~) $7.00 Each 92.00 $ 644.00 Surveying, Ime & grade $250.0C HR $ - SurveYing, topographical $250.0C HR 8.00 $ 2,000.00 Watering, I' of water. 50' soaker hose $3.62 MSF $ - Irrigation -temporary $3,000.00 Acre $ - Irrigation -buried $4,500.00 Acre 0.16 $ 720.00 Tdllng topsoi, cisk harrow, 20hp tractor, 4'-6' deep 795.00 7,161 sf; strip & stockpile topsoil $1.02 SY a nd then rea pply $ 810.90 TOTAL $ 6,733.90 HABITAT STRUCTURES' ITEMS Unit Cost Unit Cost Fascines (willow) $ 200 Each $ - Logs, !Cedaf). vi fool wads, 16'-24' dam .. 30' long $1.000.OC Each 3.00 $ 3,000.00 Logs (cedar) wo root wads. 16'-24' dam., 3D' $400.0( Each 3.00 $ 1.200.00 Logs, wiD root wads, 16'-24' dam., 30' long $245.0( Each $ Logs wI roo! wads. 16'·24' dam 30'long $460.0C Each $ - Rocks. one.ffian $60.OC Each $ - Rocks, two-man $120.0C Each $ Root wads $163.0C Each $ - Spawning gravel, type A $22.OC CY $ Weir-log $1.500.00 Each $ - Weir -adjuslable $2,000.00 Each $ Woody debriS, large $163.00 Each $ Snags -anchored $400.0 Each 9,00 $ 3,600.00 Snags -on site $50.0{ Each $ - Snags -irrported $800.0 Each $ - • All costs include delivery ITOTAL $ 7,800_00 EROSION CONTROL ITEMS Unit Cost Unit Cost Backfill and Compaclion~mbankmenl $ 4.89 CY $ - Crushed surfacing, 11/4' minus $30.0( CY $ - D~ching $7.0 CY $ - Excavation, bulk $4.0( CY $ - Fence, sIN $1.6( LF 85.0C $ 136.00 Jute Mesh $1.2E SY $ Mulch, by hand. straw, 2' deep $1.2 SY $ - Mulch, by hand, 'M:>od chips, 2' deep $3.25 SY $ - Mulch, by machine, straw, I' deep $0.32 SY $ Piping, temporary. CPP, 6' $9.3( LF $ - Piping. temporary, CPP, 8' $14.OC LF $ PIPing, temporary, CPP, 12' $18.0C LF $ - Plastic covering, 6mm thick, sandbagged $2.0C SY $ - Rip Rap, machine placed, slopes $33.98 CY $ Rock CanSU-. Entrance 100'xlS'xl' $3,000.00 Each $ - Rock Canstr. Entrance 5O'x15'xl' S1,5OO.00 Each 0.33 7,1S1 sf (0.16 ae) $ 495.00 Sediment pond riser assembly $1,695.11 Each $ Sediment trap. 5' high berm $15.57 LF $ - Sedment trap, 5' high berm wlsp~lway inc!. riprap $59.60 LF $ Sodding. I' deep, level ground $5.2 SY $ - Sodding, I' deep, sloped ground $6.48 SY $ - Straw bales, place and remove $600.00 TON $ - Hauling and dtSposal $20.00 CY $ - Topsoil, delivered and spread $35.73 CY $ - I TOTAL $ 631.00 GENERAL ITEMS ITEMS Unit Cost Unit Cost FenCing. chain link. 6' high $18.8E LF $ Fencing. chain Imk. corner posts $111.1 Each $ Fencing. chain link, gale $277.6 Each $ Fencing, spl~ rail. 3' high (2-rali) $10.54 LF 85.0 7,161 sf(O.16ac) $ 895.90 Fencing, temporary (NGPE) $1.20 LF $ - Signs, sens~ive area boundary $2.5C Each 1.00 $ 2.50 I TOTAL $ 898.40 OTHER ITEMS MAINTENANCE AND MONTIORING LAND COSTS LONG TERM SITE MANAGEMENT MITIGATION RESERVES PROGRAM ADMINISTRATION COSTS Cost $ 21,603.80 south/Urban $ 8,960.00 $ 1,700.00 1---,--------- Total $70,113.22 CHAD ARMOUR, LLC May 16, 2007 Mr. Curtis Schuster KBS Develo~ment Corporation 12320 NE 8' Street, Suite 100 Bellevue, Washington 98005 Subject: Conceptual Wetland Mitigation Plan 162"d Avenue SE -Proposed Extension King County, Washington Dear Mr. Schuster: 6500 126 th Avenue S.E. Bellevue, Washington 98006-3941 (425) 641-9743 (425) 643-3499 (fax) chad@chadarmour.com The following plan presents our approach to mitigating for unavoidable impacts to the buffer of Type 3 streams, We first looked for the opportunity to make up lost area on the site, Then, assuming that off-site mitigation is necessary and possible, we estimated the cost to rehabilitate an off-site degraded buffer. PROPOSED DEVELOPMENT PLAN Three different plats, Cavalla, Liberty Gardens, & Threadgill, are soon to be the location of single-family homes (Figure 1), Access to these plats is primitive or non-existent and will need to be constructed and upgraded. The preferred alternative to access these three sites is to construct a half a road (162"d Avenue SE) extending north from SE 144'h Street. This road will be about 625 feet (ft) long and connect with the soon to be constructed 162"d Avenue SE along the western boundary of the Liberty Gardens Preliminary Plat (Figure 2), The road extension project for the three development proposals is being managed by KBS Development Corporation (Proponent), We understand that the streams associated with the 162nd Avenue SE extension is subject to the sensitive areas ordinance. We also understand that because there is not enough area available on site to make up for unavoidable impacts, additional mitigation will use the Mitigation Reserves Program. EXISTING CONDITIONS A Type 3 stream flows down the 162nd Avenue SE Right of Way (Figure 2 -Primary Type 3 Stream). The drainage originates north and west of the Right of Way (ROW). It is alternately located in a roadside ditch and buried culvert adjacent to 158th Avenue SE, SE 136th Street, and 160th Avenue SE before it is discharged to the Smith property (Parcel No. 145750-0110), After flowing across the Smith property initially as sheet flow and then in a culvert/ditch system, it is discharged to an "engineered" ravine adjacent to Rich Lea Crest. Here the walls of the stream are short and steep and lined with quarry spalls. The stream turns south when it meets the 162nd Avenue SE ROWand flows through a deep narrow ravine. The stream discharges to an engineered (Le" constructed) stormwater detention pond that is connected to an underground stormwater conveyance system that presumably disc~a':ge~~tb~ ~(jtt:13iver. '.-;:. ... \ ~ ~~--~ ~'!=, \~, :' \\' ::.~--., \ \ 'j • C:lJobs/BCE/Cavalia/Fee In-Lieu Letter.doc r. Chad Armour, LLC MAIN FILE COpy 05116/07 162 0d Avenue SE Extension Mitigation Plan King County, Washington KBS Development Another Type 3 stream (Secondary Type 3 Stream) flows into the northern or upper end of the storm water retention pond. This stream crosses Liberty Gardens and a cleared area to the south before joining the Primary Type 3 stream. Stream Buffer The plant communities in the 1620d Avenue SE ROW adjacent to the stream include immature forest, a thick tangle of blackberry shrubs, and mowed grass. The buffer adjacent to the stormwater pond along the lower -250 ft of the ROW generally supports grass and a few Douglas-fir (Pseudotsuga menziesi/) trees. From the pond's eastern slopes and a point about -100 ft to the east the plant community includes a few deciduous trees growing through dense Himalayan blackberry (Rubus discolor) shrubs. The upper or northern -300 ft of the ROW is the location of an immature forest composed of big-leaf maple (Acer macrophyllum), Douglas-fir, black cottonwood (Populus balsamifera), and red alder (Alnus rubra) trees growing among a thick tangle of shrubs, including blackberries. In one location the back of a home and associated out building in Rich Lea Crest are located within a few feet of the west bank of the Primary Type 3 Stream. CONCEPTUAL MITIGATION PLAN The plan is to: • Straighten the Primary Type 3 Stream; • Route the Secondary Type 3 Stream through a culvert; • Enhance the remaining available buffer following road construction; and • Pay the County a fee to enhance buffer off of the site. CONSTRUCTION PLAN The site is too small to accommodate mitigation entirely on the site. As such, the plan is to enhance as much of the degraded on-site buffer as possible (-15,000 square feet [sl]) and pay the County the equivalent fee to mitigate for buffer impacts that cannot be achieved on the ROW by enhancing 14,500 sf of degraded off-site buffer (Table 1). On-Site Buffer Enhancement We assume that machine encroachment will be limited to trackhoe excavators used to install snags and place logs. We also assume that most if not all of the crushed shrubs and herbs will naturally recover. We further assume that: • The blackberry shrubs will be removed to expose bare mineral soil and prepare the area for planting; • A total of 71 conifer and 54 deciduous trees will be installed individually 11 ft on center (OC) to increase tree density (Table 2); • A total of 490 shrubs will be installed in clumps 5 ft OC to promote a robust native shrub layer; • The ground will be covered (2:80%) with at least three different native herbaceous plant species; and • A total of 2 snags and 2 logs will be installed. C:lJobslBCElCavaliaiFee In-Lieu Letter.doc 2 05116107 Chad Armour, LLC 162"0 Avenue SE Extension Mitigation Plan King County, Washington Table 1 -Buffer and areas' based on Preliminary Road Improvement Extension b stream channel occupies -2,500 sf Off-Site Buffer Enhancement We assume that: • It will be necessary to purchase urban land; KBS Development • A total of 120 trees and 475 shrubs will be installed in a degraded buffer at a rate of 0,041 plants/sf (Table 2); • A mix1ure of native herbaceous plant species will be broadcast seeded on the degraded buffer; • 15 snags and 11 logs will be installed in the degraded buffer; and • Compost will be added around each of the installed plants in a circle 3 ft in diameter and 3 inches (in) deep, and the site will be irrigated by way of a permanent irrigation system (see Mitigation Reserves Program, Fee-In-Lieu Worksheet), MONITORING The Proponent will monitor the on-site mitigation areas for at least three years following installation in the summer. The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for monitoring the off-site buffer for at least three years following installation, The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for monitoring associated with the proposed buffer fill and subsequent mitigation efforts, C:/Jobs/BCE/Cavalia/Fee In-lieu Letter,doc Chad Armour, LLC 3 05/16/07 (")(") :::r:....:... ,,'-0.0 »0" ~!e. 3 OJ 0(") em ~..., () '" '< (")" 1if -"T1 ~ :;-, • iii' c r II !J: "-0 " ... ~ ~ ~ , Table 2 -Plant and Habitat Amenit Installation Guide Total On-Site Buffer Off-Site Buffer 27 6-8 ft; 11 ft OC 27 6-8 ft; 11 ft OC Dou las-fir 71 36 6-8 ft; 11 ft OC western red cedar 70 35 6-8 ft; 11 ft OC Total Trees 245 125 c.;ornus SCOlOmTera S OT J-o; oTt uc.; M~/IIC:: fll.<:~~ 15,000 sf; to be enhanced on-site b 14,500 sf; to be made up off site according to KKC 21A.24.137 Resource Mitigation Reserve , total average density is 0.041 plants/sf ;>;~ _. en "'" co , (") ~ o~ " '" " " ,<" -'" ~(J) ffim :::rm 5' ~ co", -" o en " _. 0 " s: '" <5' III -o· " -0 OJ " ;>; OJ (J) o '" < '" 0' '" 3 '" 3. 162"' Avenue SE Extension Mitigation Plan King County, Washington KBS Development MAINTENANCE The Proponent will maintain on-site mitigation area as follows: • Remove weeds for three years after installation. Weeds include non-native vegetation, particularly Himalayan blackberry, reed canarygrass (Phaiaris arundinacea), and evergreen blackberry (Rubus laciniatus); and • Replace trees and shrubs that die during the 3-year monitoring program to maintain the minimum 80 percent survival rate. The Proponent has included costs in the Mitigation Reserves Program, Fee-In-Lieu Worksheet to allow for maintenance of the off-site buffer during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for maintenance associated with the proposed buffer fill and subsequent mitigation efforts. CONTINGENCY PLAN If there is difficulty achieving the performance standards for the on-site mitigation, the Proponent proposes to work with the County to develop a contingency plan. Contingency plans can include, but are not limited to: regrading, additional plant installation, erosion control, and plant substitutions of type, size, quantity, and location. Such a contingency plan shall be submitted to the County by December 1'1 of any year when deficiencies are discovered. The Proponent has included costs in the Mitigation Reserves Program "Fee-In-Lieu Worksheet" to allow for a contingency plan should deficiencies in the off-site buffer be discovered during the three year monitoring program. The "fee-in-lieu" revenue that the County will receive in conjunction with this Proposal constitutes the full extent of the Proponent's responsibility for contingency measures associated with the proposed buffer fill and subsequent mitigation efforts. SCHEDULE The Proponent anticipates executing this plan at the first available opportunity fOllowing the receipt of the necessary approvals from the County. Assuming construction occurs the summer of 2007, the first monitoring event will occur the following spring. For on-site mitigation, the Proponent will submit a monitoring report to the County as indicated previously. Maintenance will occur within four months following submission of the monitoring report. Subsequent monitoring, reporting, and maintenance will follow the same schedule during the subsequent years. LIMITATIONS Work for this project was performed, and this letter report prepared, in accordance with generally accepted professional practices for the nature and conditions of the work completed in the same or similar localities, at the time the work was performed. It is intended for the exclusive use of KBS Development Corporation, Mr. Dave Petrie, Eagle Creek Land Development, LLC, and their assigns for specific application to the referenced property. This report is not meant to represent a legal opinion. No other warranty, express or implied, is made. C:/Jobs/BCEICavalia/Fee In-Lieu Letter.doc Chad Armour, LLC 5 05/16/07 162 no Avenue SE Extension Mitigation Plan King County, Washington KBS Development It should be noted that mitigation planning is an inexact science. Biological professionals may disagree on the nature and extent of mitigation plans. Final acceptance of this mitigation plan is the responsibility of the permitting authority. Accordingly, the mitigation plan developed for this road extension should be reviewed by the appropriate permitting authority prior to committing to detailed planning and design activities. Any questions regarding our work and this plan, the presentation of the information, and the interpretation of the data are welcome and should be referred to the undersigned. Sincerely, Chad Armour, LLC ~A~."- Chad Armour Principal Attachments: Table 1 -Buffer impact and makeup areas Table 2 -Plant and Habitat Amenity Installation Guide Figure 1 -Vicinity Map Figure 2 -Site Plan Attachment A -Mitigation Reserves Program, Fee-In-Lieu Worksheet cc: Wayne Potter, Barghausen Consulting Engineers Nick Gillen, King County DOES C:/Jobs/BCElCavaliaiFee In-Lieu Letter.doc Chad Armour, LLC 6 05/16/07 FIGURES • ON TRAFFIC CONSULTANTS ..l LIBERTY GARDENS VICINITY MAP FIGURE 1 PLAT OF THREADGILL CAVAllA LIBERTY GARDENS / / / / / / Liberty G?1rdens ! I i -j // ----'---I ./ ;'// //// /--~ ;;::/ / / / / / / / / /' '/ /' / /'~ // / /' :'/j' / /.--, / I ,/' / ,-I--- ---- I , , j 1 i Seco ndary Type 3 St rea m ------, ~- ----./// --1-/ / .......... -----f ...// /' ~ / -rX1STING , , "- "------1..~ I '~roo i BR IDGE II/I --I ~ \ \ " I I I / / / (/ / \ I -" '-~ \ \ /! /, -. I I . 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E '(CFI=nARA ) I ",,).-' // _--_-. __ -_---__ -~ /.l'\ NOO'23 '3 6 "E 491.1 7 ' / _ _,-;;-.o~ _'::'<,':::,,-25"B'ufi er . -162ND A~ S --:t;:-_ -____ > -,/.:c -=--{-::::~ ~r:':;ff;c:.:~ c~ __ ~'~-:...-Q a.--'8C_--_---"_' ___ :. ,: ___ -L ________ ...L ___ ~--.-.' ~ --...-------~.:~-_s ~_}.::,,=='=-.. -;.::.-::---n '> -v X' 1 ===-.lI...=~=""F=======-'-' =-~-_-1"7-,---~ --I 25' Bult er .. -r ) -_ _ _ _ _ _ _ __ / '<i ' I P Smith Property I I I I I I I I I l ," " Pr imary Type 3 strek ;", Rich Lea Crest __ ...::--I'oi-J ___ _ o 60 120 b)/ ~ W CJ) Sc ale in Feet FIGURE 2: S ITE P LAN 162nd Aven u e SE Extensi on King County. Washington Chad Armour, LLC 6500 126th Avenue SE Bell ev ue, Wa s hington 98006 DATE ; O~/JO/07 12 :5 1pm owe NAt.4[: G: \,proje1:t \Ct ients \ormovr\KBS-t 62nd A'toe _CoYOlto _ Threodq il l\petrie I62 _0ot .d wg [ ATTACHMENT A Mitigation Reserve Program Fee-In-Lieu Worksheets ® Mitigation Reserves Program Fee-In-lieu Worksheet Multiple DOES Permit#: King County Date. 5 /1 0//2007 Prepared by: Chad Armour, LLC PLANT MATERIALS' Type Unit Price Unit Quantity Description Cost PlAN TS: Potted, 4' diameter . medir..m $5.0C Each 198.OC $ 990.00 PLANTS : Containe r, 1 gallon , medium soil $11.5C Each 1 98 .OC $ 2,277.00 PLANTS : Containe r, 2 ga llon. medium soil $20.0C Ea ch 199.00 $ 3.980.00 PLANTS ' Con tainer, 5 gallon . medium so il $36 .0( Ea ch $ - PlANTS : Seediog , by hand $0.5e SY 806.00 7,250 sf $ 403.00 PLANTS : S l~s (wilow. r ed.csier) $2.0 Each $ PlAN TS: Slakes (wi now) $2.0e Each $ - • All costs include installatioo TOTAL $ 7,650 .00 INSTALLATION COSTS ( LABOR, EQUIPMENT , & OVERHEAD) Type Unit Price Unit Cost Compos t, vegetable. delivered and spfea d $37 .8 CY 39.0C 3 ft rad around es plant ; 3 in decf: $ 1.477.32 Decompacting tilllhar¢an , medium , to 6 ' depth $1.57 CY $ Oocompacting t~lIhar~an , mediu m, 1o 12' depth $1.5 CY $ - Fer1ihze, slow release tablets, 30gmltree $3.21 Ea c h $ Hy,*"oseeding $0.51 SY BOS .OC 7 .250 sf $ 411.06 labor . general (landscaping) $25.OC HR $ labor . general (coostr uctKl n) $37.OC HR 16.0C 14,500 sf (0 .33 ac) $ 592.00 labor : Consufta nt . supervising $55.OC HR 10.0e 14.500 sf (0 .33 ac) $ 550.00 La bor : Consuftanl, on-sile re-de sig n $95 .00 HR $ Rental of dec ompacti ng mach inery & ope ra tor $70.65 HR $ - Sand. coarse builder's. delIVered and spfead $42 .06 CY $ Slaki1g material (sel per tree ) $7.00 Each $ Surveying . line & grade $250.0e HR $ - Surveying . topograp hical $250.00 HR 8.00 $ 2.000 .00 Watering. j ' otwa ter . 50' soaker ho se $3.62 MS F $ - Irrigation -tempora ry $3.000.IX Acre $ - Irriga tion -bu ri ed $4.500.IX Acre 0 .33 $ 1.485.00 TIlin g topsoi. dsl!: harrow . 20hp lrae lOl'. 4'~' deep $1 .02 SY $ TOTAL $ 6 ,515.38 HABITAT STRUCTURES' ITEM S Unit Cost Unit Cost Fascines ('WIIow) $ 2.00 Each $ - logs. (cedar). w roOl wads . tS ' ·24' diam., 30' lo ng $1.000.0( Each 3 .00 $ 3,000.00 l ogs (cedar) oNO roo! wads . 16'·24' diam" 30' $400.0C Each 8 .00 $ 3,200.00 logs. "'0 root wa ds . 16'·24 ' ,jam .. 30' long $245.0e Each $ logs wi rool wads. 16"·24' ,jam . 30' lon g $460.0e Ea c h $ Rocks. one-rnan $60.00 Ea c h $ Rocks . two-man $120.0e Each $ Roo l wads $163.00 Ea ch $ . Spawning gravel. type A $22 .00 CY $ - Wer -log $1.500.00 Each $ Wer -ad justable $2,O OO .IX Each $ Woody debri s. large $163.0 Ea ch $ Snags -anchored $400.0 Each 15 .0C $ 6.000.00 Snags -on s~e $50.OC Ea ch $ Snags -imporled $800.0 Each $ - , All costs include delivery I TOTAL $ 1 2,200.00 EROSION CONTROL ITEM S Unit Cost Un it Cost Backnl and Conl>ac1ion-embankmenl $ 4.89 CY $ - Crushed surfacing , 11/4 ' minus $30.OC CY $ - D~ching $7.0 CY $ - Excava!Jon, bu lk $4.0 CY $ - Fence, sill $1 .6 LF 120.00 14,500 sf (0 .33 ac) $ 192.00 Jute Me sh $1 .2 SY $ Mutch, by hand, stra w. 2' deep $1 .2 SY $ - Mul ch . by hand, wood chips, 2' deep $3.2 SY $ Mulch . by machine, straw, I ' deep $0.32 SY $ Pipi ng , tempo/a fY, Cpp, 6' $9.3 C LF $ - Piping, temporary, CPP , 8' $14.OC LF $ Piping, temporary , CPP. 12' $18 .OC LF $ - Pl as1ic covering . 6mm thick, sandbagged $2.0e SY $ - Rip RaP. machne placed , slopes $33 .91 CY $ - Rock Constr. Entrance 100): IS'x I ' $3,000.00 Each $ - Rock Cansu . Enllance SO'x I5'x1' $1 ,500.00 Each 0 .66 14,500 sf (0 .33 ae) $ 990.00 Sediment pond riser assembly $1 ,695.11 Each $ - Sedimen t tra p, 5' high bElfm $1 5 .5 LF $ - Sedmenl rap. S' high betmwlspi'lway ind o riprap $59.6C LF $ Sodding , "deep.level gfound $5.24 SY $ - Sodding , ,'deep. sloped gro und $6.48 SY $ - Slfaw bales , place and remove $600.00 TON $ - Having an d disposal $20.00 CY $ - T opso~. detVeied and spread $35 .73 CY $ - I TOTAL $ 1,lB2 .00 GENERAL ITEMS ITEM S Unit Cost Unit Cost Fenci ng. chain link. 6' high $18.8 LF $ Fencing, chain ~nk , cOIner posts $111 .1 Ea ch $ - Fencing, chain link. gate $277.6 Each $ - Feocing . spl~ rai~ 3' high (2-fail) $10.5< LF 120.00 14 .500 s f (0 .33 ac) $ 1.264 .80 Fencing , temporary (NGPE) S1.2e LF $ - Signs, sens~jve area boundary $2 .5C Each 1 .00 $ 2.50 I TOTAL $ 1,267.30 OTHER ITEM S MAINTENANCE AND MONTIORING Maintenance and Mon ~oring Inspection , frna l LAND COSTS LONG TERM SITE MANAGEMENT MITIGATION RESERVES PROGRAM ADMINISTRATION COSTS Co nstru ction Cost Unit may longer monitoring and maintenance t erms. This will be evaluated on a case-by- case basis for development applications. Mon itoring and maintance ranges may be $ 28,814.68 Cost 362.25 579.60 $ 18,648.00 1,700.00 -----~ -------- I Total $97 ,645.08