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93-102616 (2) CITY OF ID -= F_ LIE_..IZAL_ (206)661-4000 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 April 8, 1994 Mr. Paul Krakow Parco Group, Ltd. 4303 North Ruston Way Tacoma, Washington 98402 Re: Plat of Westhill FW File No. SUB93-0002 Dear Mr.,- a ow: At the April 5, 1994 City of Federal Way City Council meeting, the Council voted unanimously to approve your request for a 7-lot subdivision generally located near 7th Way S.W. & S.W. Campus Drive. The next step in the subdivision process will be submittal and review of engineering drawings and completion of the bonding process. Until this step has been completed, no permits for construction can be issued. Preliminary plat approval is good for a period of three years. Within this three year period all necessary improvements must be completed. However, a request for an extension may be made if the request is submitted to the city 30 days prior to expiration of preliminary plat approval and meets the provisions of section 22-114 Effect; duration approval, Federal Way City Code. If you have any questions, please feel free to contact my office at 661-4104. Sincere y, (7 Michael omas Associate Planner c: Kathy McClung, Land Use Administrator Jeff Sharp, Engineer a CITY OF • 8JJ T (206)661-4000 INYN) 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 January 24, 1994 Mr. Paul Krakow Parco Group, Ltd. 4303 N. Ruston Way FILE. Tacoma, Washington 98402 Re: Westhill Preliminary Plat City of Federal Way Dear Mr. Krakow: Enclosed you will find a copy of the staff report prepared for the Federal Way Hearing Examiner concerning Westhill Preliminary Plat. Any questions or concerns regarding the staff report should be directed to my attention. Just a reminder that the public hearing is scheduled for February 1, 1994 at 2 p.m. , in the Federal Way City Hall Council Chambers. Sincer 1 Mi e h as Associate Planner Encl: Staff Report c: Kathy McClung, Land Use Administrator Rich Tomkins, Pacific Engineering FILRECEIVED BY PARCOCOMMUNITY DEVELOPMENT DEPARTMENT GROUP LIMITED FEB11 1994 February 10, 1994 Mr.Michael Thomas Building and Planning Department City of Federal Way Federal Way,Washington 98003 Re: WEST HILL PROJECT 7th Way S.W.,Federal Way Dear Mr.Thomas: Within our above-referenced project is a 50-foot buffer of trees and natural growth between the homes to be built and the stream which exists on the parcel of property. The Public Works Department has requested that we install a 12-foot wide service road running parallel to the stream during the development process. They have stated that this service road must be constructed out of grass pavers, however, we do not feel this is a reasonable request for the following reasons: 1. The cost to construct this access road from grass pavers would be excessive, estimated to be four times the cost of asphalt 2. Grass pavers would require that the City provide for constant maintenance 3. Grass pavers have a tendency to shift and crack over time due to the plant growth beneath the pavers 4. If not properly maintained,this type of access can turn into an ugly overgrowth of grasses and plants which could be unsightly and a detriment to the value of the homes in the development As an alternative, we propose to provide a gravel base to the elevation of the culverts and, from that point,blacktop the access area as necessary. Since�, P• 'A , . ' 1 UP,LTD. --- / Paul II.Krakow Presi, 'nt PDK:.l w 4303 North Ruston Way Tacoma,Washington 98402-5374 (206) 756-9921 •FAX (206) 756-9366 WEST HILL PLAT A sixty(60') foot cutting preserve shall be maintained along the South Plat Line from the East edge of Tract C to the Eastern portion of the Plat. Within the cutting preserve, all trees will be maintained,and only damaged or diseased trees which are a danger to other trees or structures shall be permitted to be cut down. CITY OF `� FILE (206)661-4000 �\) FirlY- 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 CITY OF FEDERAL WAY MEMORANDUM DATE: February 10, 1994 TO: Mr. Stephen Causseaux, Jr. Federal Way Hearing Examiner FROM: Michael Thomas, Associate Planner City of Federal Way, Department of Development Services Re: Westhill Preliminary Plat Application FWHE94-6 Enclosed you will find arguments from both the applicant and City of Federal Way regarding a maintenance roadway for a stream channel that bisects subject property. If you have any questions, please feel free to contact my office at (206) 661-4104. . , r q ..,, CITY OF FEDERAL WAY MEMORANDUM DATE: February 10, 1994 TO: Federal Way Hearing Examiner FROM: Gregory D. Moore, AICP Director of Community D opment Services RE: Addendum to Staff Report - Westhill Preliminary Plat FWHE#94-6 I. Introduction The applicant, Parco Group, Ltd. , is proposing development of a 1.94 acre parcel into seven (7) single family residential lots. At the conclusion of the public hearing on February 1, 1994, the Hearing Examiner left the record open until February 8, 1994, and subsequently to February 11, 1994, so that additional discussions could take place between the applicant and the City regarding the requirement of an access roadway. The requested roadway is intended to provide maintenance access along a reach of stream that runs through the westerly portion of the proposed plat. The access roadway would be constructed within ?fifty (50) foot minor stream setback. The stream in questions is a tributary to Panther Lake and provides a drainage course for a basin that is approximately 1, 300 acres in size. Though the stream is intermittent, it does, at times convey a significant amount of water during large storm events. A Mitigated Determination of Nonsignificance (MDNS) was issued for the proposed action on December 16, 1993 (see Exhibit D, Staff Report) with the pursuant comment and appeal period ending on January 14, 1994. During the comment and appeal period the applicant did not exercise their right to appeal any conditions of the MDNS issued. Having failed to do so, the City finds the applicant's request of the Hearing Examiner to review SEPA conditions without standing. The proper vehicle for bringing SEPA under the purview of the Hearing Examiner is for an applicant or affected person to file an appeal following the procedures oultined in section 18-51, Environmental Protection, Federal Way City Code. However, in an attempt to clearly illustrate the City's decision to require an access roadway and to further specify a certain type of roadway surface, a response is provided below. II. Discussion During the hearing of February 1, 1994, the applicant brought forth several arguments against having to provide an access roadway. In response, the City's conditioning of the SEPA determination is based on the proposed plat's use of the stream to convey storm water generated by the plat. Storm water from developed lots will enter the stream channel via 7th Way S.W. In keeping with the policies and practices of the City's Surface Water Division, access roads are required for any storm water facility such as biofiltration swales and detention ponds. In this case, maintenance will likely constitute removal of trash and debris and removal of woody plants and trees that have begun to establish themselves in the stream channel. Proper maintenance ensures that the stream channel conveys water in an uninterrupted manner. The MDNS issued was conditioned as follows (see Exhibit D, Staff Report) : To facilitate periodic maintenance of the stream channel the existing dirt road along the northeast side of the stream will need to be improved to 12 feet in width and be surfaced with grass-pavers or [other] approved surfacing material for the entire length of the subject property. Grass-pavers are a system of grids made of plastic tha ', can support the weight of vehicles while allowing for grass to grow through it. The benefit of this type of paving system is that it reduces the amount of impervious surface and in this case, reduces the amount of runoff entering the adjacent stream. Aesthetically it is more in keeping with the natural setting of a stream setback. The City explored the cost of grass-pavers and found the cost to be approximately $2.50 per square foot. In this case, use of other types of surfacing such as gravel or asphalt would likely prove to be problematic due to periodic inundation of portions of the roadway during large storm events. Inundation would wash away a gravel surface and undermine the subsurface of an asphalt road resulting in cracking. The pro-rata share contribution toward the improvements to the Panther Lake Regional Stormwater Facility pays only for the improvements to Panther Lake itself. The contribution does not account for the cost of systems to convey the water to Panther Lake. 2 III. Recommendation After discussions with the applicant and further review of the proposal, the City of Federal Way adheres to its original position that the access be provided along the entire reach contained within the subject property and that it be constructed of grass-pavers with the caveat that the gravel or asphalt can be used to an elevation equal to the top of the culverts passing under 7th Way S.W. . Again, our position is that the applicant does not have standing to contest an MDNS condition before the Hearing Examiner. • FEB-10-1994 11:03 FROM PARCO GROUP, LTD TO 12066614129 P.02 • • PARCO FP P GROUP LIMITED February 1.0,1994 Mr.Michael Thomas Building and Planning Department City of Federal Way Federal Way,Washington 98003 Yta• WEST HILL PROJECT 7th Way S.W.,Federal Way Dear Mx.Thomas Within our above-referenced project is a 50-foot buffer of trees and natural growth between the homes to be built and the stream which exists on the parcel of property. The Public Works Department has requested that we install a 12-foot wide service road running parallel to the stream during the development process. They have stated that this service road must be constructed out of grass paver`, however, we do not feel this is a reasonable request for the following reasons: 1. The cost to construct this access road from grass pates would be excessive,estimated [o be four times the cost of asphalt 2. Grass pavers would require that the City provide for constant maintenance 3. Grass pavers have a tendency to shift and crack over time due to the plant growth beneath the pavers 4. If not properly maintained,this type of access can turn into an ugly overgrowth of grasses and plants which cnuld be unsightly and a detriment to the value of the homes in the development As an alternative,we propose to provide a gravel base to the elevation of the culverts and,from that point,blacktop the access area as necessary. P ' 1 ' ,UP,LTD. Paul .Krakow f'resi nt PDK• w 4202 North Paxton Way Tacoma,Washington 98402.5374 (205)756-9921•FAX(206)756-9366 , TOTAL P.02 R mo 5 S Fi3S�S'E� flI �'b b8n i 6 x ggg g Y kpg 1.., S' ' I Y o FlIR!;I, R 11 Yyi�i ! C4 W ;Izft 4 11 gr p!,,s c. 1 ! ____, , -- P 3 oz SC `16m0 8l-3l gggylgg E47 9 '� SXCin ze %/ " SAS \ z '�, \ - 0y6. .. \�. $4 t! 5 " \ A� Z IN / „ , 1.:,,,.., ,E,.‘,,,it, 11P11/4.As ‹I'v... \\ P:: 4" V ,,,-"7,-; ., ,,c, ‘ ,,e,4 \\("<' A(� w PO VI MI • D ,fir, / 1. 1 ,\oz) m oez 111 ! r�3 r; rn ,. �. ` N- •' /O Z , , , , sc,,, , -- } Ai J , \ y v. � ' I I �a 7 Z \ ,-� 1` 'r 1 c v\ � 111111 3 a '\ pg i4. llelir d oo� o'' Tp I zm I iPl"yM=re11`i111is pi;l !lit;1i€I; li, iii v_ziQ 3 ll zco� i r z _ f PRELIMINARY PLAT �e i° ' WEST HILL PLAT KING CO.,WA O. 9 s'�o9a o 2 2 n' FOR:PARCO GROUP,LTG. '.` ,I 9 D r` = O tf TACON.,USTONWA WAY 9 — Q,®®� �x�Y Z I ] A w I TACOMA,WA 96T02 '?yeA E`�O PHONE:12061766-9921 v - 130 ANDOVER PARK EAST,SUITE 300 SEATTLE.WA 6166 PHONE:(206)431-7970 FA%:431-797 CITY OF FEDERAL WAY NOTICE OF LAND USE HEARING WESTHILL PRELIMINARY PLAT Notice is hereby given that a public hearing will be held by the City of Federal Way Land Use Hearing Examiner at 2:00 p.m. on February 1, 1994 in the Federal Way City Council Chambers, 33530 1st Way South, Federal Way, Washington 98003. FILE NUMBERS: FWHE#94-6, SUB93-002 HEARING TOPIC: An application to subdivide a 1.94 acre parcel into seven (7) single family residential lots has been submitted. PROJECT LOCATION: The subject property is generally located 200 feet east of the southwest corner of S.W. Campus Drive and 7th Way S.W.; just north of the King County Aquatics Center. APPLICANT: Parco Group, Ltd. PURPOSE OF HEARING: To take public testimony concerning the proposed action. Any person desiring to be heard on the application is invited to attend the hearing or submit written comments to the Hearing Examiner, either by delivering these comments to the Department of Community Development prior to the hearing or by presenting them to the Hearing Examiner during the hearing. The Hearing Examiner will issue a decision on this matter within ten working days after the close of the hearing. Only persons who submit written or oral comments to the Hearing Examiner may challenge the Hearing Examiner's decision. The application for approval is to be reviewed under the applicable codes, regulations and policies of the City of Federal Way. The official file is available for review during working hours (8am - 5pm) in the City's Department of Community Development, 33530 1st Way South, Federal Way, Washington. A staff report concerning this matter will be available for review one week prior to the hearing date. Questions regarding this proposal should be directed to Michael Thomas, Associate Planner at (206) 661-4104. PUBLISHED IN THE FEDERAL WAY NEWS ON JANUARY 18, 1994 . , . ' • • •• . • • • • . . ... - • . • •• • .- •• • - • •- . • •• • ... ... • : . . . . . • . . • • . • . . .. .., . . . ' • • • . . . ': • . . . ... . . ., .„... ,. ... .• , . .. . • • • ' • . . . • ' - .• . . . . • • . " • • . . • • • ' . • • . • . • . • • . - • • • . '.• . . • • . •: ..: .' .: • .-:;.' 3 3 T . . • . . • • • . . ! 1 • .:' ' . .. ... • ,. . ' • . • • i .. ••e! Ik../ \i'.. v ., 4 . • . . • . .. - : -. •::.•...• , :..... 7 .--- s•-• . .'-.': :-: .i. :.'1. tl. !::;•.', ;,, i I .V\ .' c ......i.... t,: ., ; 1 ''' ' Iii ' i -.-• , 4 4 . • ' • " • .. \ .,... .1...1./4 . •.: ...:.: '• ''• •.': 1 . • i 1 ,. .: ..:, : } •• , r, r-..... -:7:7 •1•• J• .1• i i: . . . - '‘ - " . 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I . ii, I .. . . . . , . .. . . . ._ , ,.. i , 1 -1 . 1 . . . . ,....,, . , .,...,. , ni,..4. tir t..„,./ ...,.... , T 1 \,0 jr. _. 2. ••4 .. v,. I j/ 4(.4); 7 ,e;447-1112..or I. 1. 6 1 1 .. . ..// 412.:40 1 ,r y 1 . f 1 • 1 _._,!_:.4" • • 4 • h • iTJF,+F • C: • ,1 �f t! / 4 r %i le ice. "'i I I _[tril i y I I ll I / 1 / •I i t. I i 4._.. 1 ' 1 llT�- .,,,r1j 11..-/:,' ( 1. it 'I...% 1 1 • ' II /fi f J % '`: 3 '' •-1 .�:4 � i- - 4 ,� / ".. z-t :1 - J a 31oj, a • Me_ If ' ug i' r'� "" . ... . : , %f a 1 A. ' , ' -. AI . . .., + ' I 113 0 (:;:: i 1 !I I I- 1, I li\ .! - 1:: h- ' ... .-.]..c.:.:".....:- I 11...., i :....,....., 1 ''. il I I I L i:2. 1 CI:. ..."\,,,...., „..-:•,.,„, , ,,,,c - • ,iz: 1.. ..,, er 1. ! . 1 -..,.,/i..1 . I .--.:;_. li ili[l ‘,..,i, i•-• ,. . ; . . . . ' _-__-15:I.. -i 1 41 -f`I '':,..-;.•:-..„..-L j .1 I I' jj r-el._-.:-..:-..-:_-:..--...--.:-.F. c•••::::•-:.•::----__---•_- .. 1 ;") A .:.-.-:::"--....---•.-...l. 4 .-_,-,..-;• i 1,0 1'tiel ISI ,"/". . .- !' - — , :•�}tr G st 'sir r �, • C f Y z� I • l i li . J _ i. ; a low/ .....",............ !.. • ...j 1 . . ,--I i L ,,.. • L i , , . • • . . . .. . , , ... .... i . , , cc, _... . , ,i___LI { . . . .. . • . . . . .,_ „.., . , , . ) :,..• ..._ .....„......._______________ ,__•1 i. ____ . __I__ _ . _,_ 1 _______ • . . . . . 17. ... ...„..........______ • • 0jail'-tP'�.,i�i,_•., ., 1 —____ 1 ?J.. j i""v `� 7 - w Sr 1-k t L.L PLAc-c tTT. FL e , ,TAN-26-1994 10:01 FRO ARCO GROUP, LTD TO 12066614129 P.02•i`-L` `r }`- ` ease return to: H "'y(, I This certificate provides the King County ID Department of Health and the Department of uovelopment >. Department of Development and and Environmental Services .bi.i... AZ Environmental Services with 36O0-136lh Place Southeast 4O $ co information necessary to evaluate Bellevue,Washington 98006-1 N. ,,r development proposals. (20s)2s-sago 5. Q S - P i • KING COUNTY CERTIFICATE OF WATER AVAILABILITY . � oo not wrlto in this'box -= O number - -----.._... ��_ name .S2 le To D Building Permit ,1 Preliminary PIat or PM tU E ❑ Short Subdivision El Rezone or other _ co . E .4..APPL2CANTF5 NAIL ... �-i11UL14 ; ,__._. �. ... ..:. PROPOSED USE 'RP t,p_NT t,A-V�-. _ -- -- - LOCAT mu 5 Vifi�'1 S' ,�R�`+! ! . .d_ 7 k.. NJ A."--t _ _ .. 1 +fit � (Attach map & legal description if necessary). * 1 it II 4 # 4 4 4 4 4 4 4 f 4 4 WATER PURVEYOR m+TFORMATION - 1. a. Water t1.11be provided by cervice connection only to an existing I t • water main St feat from the site. size OR b. ❑ Water service will require an improvement to the water system ofs ❑ (1) feet of water main to reach the site, and/or ❑ (2) the construction of a distribution system on the site; and/or D (3) other (describe) 2. O, The.water system iS in conformance with a County approved water comprehensive plan. b. LI The water system improvement will require a water comprehensive plan amendment. 3. a. The proposed project is within the corporate limits of the district, or has been l' il granted Boundary Review Board approval for extension of service outside the district or city, or is 'within the County approved service area of a private water purveyor. OR b. 0 Annexation or BRE approval will.be ntoecgary to provide service. 4, a. Wator is/or will bet available at the rate of flow and duration indicated below at [f�(`i(no less than 20 psi measured'at the nearest fire hydrant htuAcniktt lb feet trem the ems-l-drirreproperty (or as marked on the attached map) Rate of Flow Duration ❑ less than 500 spat (approx. gpm) ❑ less than 1 hour ❑ 500 to 999 gpm ❑ 1 hour to Z hours 1000 gp or more FOR 2 hours or more flow Lest. ar_ _ . . goVwr_. . - C) calculation of. 9Pm (Commercie7. Building Pewitsrequire flow. ORtest or calculation) b. 0 water system is not capable of providing fire flow. Coi o N rs/cONP IT IONS Extended Page 2, 1 1 hereby certify that the above water purveyor information is true. This certification shall be valid for one year from date of signature. Federal Wav water and Sewer Nip if. ( 5E??'o Agency Name Signatory NAt _ ! gu40.1 1?),../6 71 gi /JAK! Q.D�f e i�i !// �' Title 8,gnature D to F 278 6, Z.-l"R 1 JAN-26-1994 10:02 FRO -ARCO GROUP, LTD TO 12066614129 P.03 This certificate provides the Please return to: 4- Il Department of Roa2th and BUILDING 8 LAND DEVELOPMENT Building & Land Development t.ti. .5. • Pals; Planning & Sources t. with Information necessary try {},1 0 3600 ACE 136th PLACE Southeast evaluatedevelopment proposals. .(,,.„ a 13ellevue, Washington 981306-1 JU > . (206) 296-6600 . m KING COUNTY CERTIFICATE OF SEWER AVAILABILITY 0 bo not wr1to in this box N i number name 0 D Dsi.lding Permit If Preliminary plat or PUD V 0 Short Subdivision Rezone or other APP L SCANT'S NAME PA c_o) (In got.)P Li 0.. • ...-. iv V_. q Q PROPOSED USE RE D.I.l.TLAL. _ . -- - ----------•- - 3 5 .ATTAG(-sb —g g . • ' (Attach map & legal description if necessary) U: Q ►X . .1 if ; if # 0 0 if if #I I # # # I if SEWER AGENCY INFORMATION 1. a. CV Sewer service ltl be provided by side sewer connection only to an existing e ' size sewer apt , feet from the site and the sewer system has the capacity to serve the proposed use. OR b. E.I Sewer, service will require an improvement to the sewer system of: ❑ (1) __feet of sewer trunk or latteral to reach the site; and/or • C3 (2). construction of a collection system on the site; _ and .._. _ __ _. _ . __. _.. ___.__ -_ .- .._..- .. • 0 (3) other (dc cribs) - 2. • a. The sewer system improvement is in conformance with a County approved sewer comprehensive plan. OR • b. 0 The sewer system improvement will require a sewer comprehensive plan amendment. 3, a. R;i The proposed project is within the corporate limits of the district, or has been granted Boundary Review Board approval fox extension of service outside the district or city. OR b. u Annexation or DRS approval will be necessary to provide service. ,*4. Service-is au , e-ct to t.he.--fo.11.o,wings ... —. -. .. a. Connection chart;e:._,7/,L,,, E CilL.GU;( ./1 b. Easement(s) : _ c. Other: _____ Extended Pape 3. 1 * The District, at its s discretion., reserves the ; it to delay or deny sewer service based, uponi capacity limitations in District and Other Purveyor facilities. . I hereby certify that the above sewer agency information is true. This certification shall be valid for ona year from date of signature. Federal wa water and Sewer iv/ter E. aooerre.. . Agency Name signator hauls �Cf4AI Title —— ignaturc 6;(-- =ITO va Et 1.-Z. ly TOTAL P.03 CITY OF G • vv -- Y PUBLIC WORKS MEMORANDUM TO: Mike Thomas FROM: Jeff Sharp J' For Your Information DATE: November 22, 1993 SUBJECT: West Hill Subdivision File No.: SUB 93-0002 After reviewing the submitted downstream analysis and performing a site visit the following comments are presented for your report. STORM DRAINAGE, GRADING & EROSION CONTROL 1. On-site detention is required in accordance with the 1990 King County Surface Water Design Manual(KCSWDM)and recommendation BW-2 of the Hylebos Creek and Lower Puget Sound Basin Plan. However, the applicant may, instead, choose to use the Panther Lake Surface Water Facility. The applicant's Level 2 Downstream Analysis indicates that the down stream conveyance system has adequate capacity to handle site runoff to Panther Lake. Therefore, no downstream improvements are required other than channel clearing. Staff concurs with the Level 2 Downstream Analysis that trash and debris be removed from the stream and woody vegetation thinned. An engineering plan and supporting calculations will be required, during plat improvement design, showing the driveway/roof runoff collection system from the proposed lots to the stream. If determined feasible by the city, the applicant shall retrofit a FROP style oil/water separator in the existing CB that discharges into a 30" CMP and into the stream, as part of the required plat improvements. 2. The applicant should submit a 2 foot contour, preliminary grading plan, as part of the preliminary plat process, to ascertain the extent of grading required, as part of SEPA. This should assume a 2,000 square foot building pad and 20 foot wide driveway. 3. A Temporary Erosion/Sedimentation Control plan shall be submitted for engineering plan review that addresses control measures proposed during site grading/construction. PRELIMINARY PLAT DRAWING 1. See attached Preliminary Plat Review Checklist. SEPA REVIEW ,,(o9/o 1. B. 1. a.: Proposed site is hilly./This has not been circled. 2. B. 1. e.: A preliminary grading plan for the building pads should be submitted and an estimated amount of dirt to be removed from the site quantified in this section. 3. B. 1. h.: No erosion control has been proposed. This section should be addressed. 4. B. 4. a.: Reed canary grass and cattails were observed on the site. 5. B. 8. h.: Site has an "environmentally sensitive" area. There is a stream along the southwest side of the site. 6. B. 14. f.: Item is not complete. No traffic study is required since the peak is less than 10 trips. PRELIMINARY PLAT CONDITIONS 1. Storm water runoff control shall be provided on-site in accordance with the KCSWDM requirements and recommendation BW-2 of the Hylebos Creek and Lower Puget Sound Basin Plan. In lieu of on-site controls, the applicant, may utilize the detention capabilities of the City's regional Panther Lake Surface Water Facility and contribute a pro rata share for the cost of development of said facility. An amount of$1,800.00 per gross acre of the proposed plat or a total of$3,492.00 is the projects pro rata share. 2. The proposed Tract "B" and "C" shall be dedicated to the city for storm drainage and open space purposes. 3. To facilitate future access for maintenance of the existing stream corridor, the existing dirt road along the northeast side of the stream shall be improved with grass-pavers, to a width of 12 feet. The access at 7th Way SW shall be improved with a driveway curb cut and bollards. The access road shall be improved from 7th Way SW to the southerly property line. 4. The applicant shall submit a 2 foot contour site grading plan for review and approval. A minimum 2,000 square foot building pad and maximum 20 foot wide driveway shall be provided on each lot. All disturbed areas shall be seeded after grading. Site grading shall be completed prior to recording of the proposed plat. A CITY of • vV PUBLIC WORKS MEMORANDUM TO: Mike Thomas FROM: Jeff Sharp For Your Information DATE: November 22, 1993 SUBJECT: West Hill Subdivision File No.: SUB 93-0002 After reviewing the submitted downstream analysis and performing a site visit the following comments are presented for your report. STORM DRAINAGE, GRADING & EROSION CONTROL 1. According to the applicant's Level 2 Downstream Analysis the down stream conveyance (�,' �` system has adequate capacity to handle site runoff. Therefore onsite detention is not �``/ required. The applicant may instead, use the Panther Lake Surface Water Facility. The surface water mitigation fee is $1,800.00 per acre, if Panther Lake is utilized. k`e,,., 2. We concur with the Level 2 Downstream Analysis that trash and debris be removed from the stream and woody vegetation thinned. 3. An engineering plan and supporting calculations will be required showing the driveway/roof runoff collection system from the proposed lots to the stream. 4. The proposed Tract "B" and "C" shall be dedicated to the city for storm drainage purposes. 5. The existing dirt road along the northeast side of the stream shall be improved with a grass-paver type road, to a width of 12 feet. The access at 7th Way SW shall be improved with a driveway curb cut and bollards. The access road shall be improved from 7th Way SW to the B.P.A. Transmission Line. 6. If determined feasible by the city, the applicant shall retrofit a FROP style oil/water separator in the existing CB that discharges into a 30" CMP and into the stream. 7. The applicant shall submit a 2 foot contour, grading plan, during engineering plan review, that provides for a 2000 square foot building pad and 20 foot wide driveway. tif,,_. 8. A Temporary Erosion/Sedimentation Control plan shall be submitted for engineering plan 1Ac" review that addresses control measures proposed during site grading/construction. c ' PRELIMINARY PL,. 1. See attached Preliminary Plat Review Checklist. SEPA REVIEW 1. B. 1. a.: Proposed site is hilly. This has not been circled. 2. B. 1. b.: Northeastern slopes of site are 40+%. This is an area defined as "Geologically Hazardous". 3. B. 1. h.: No erosion control has been proposed. Provide. 4. B. 4. a.: Reed canary grass and cattails were observed on the site. 5. B. 8. h.: Site has two "environmentally sensitive" areas. Slopes greater than 40% at the northeast corner of the site and the stream along the southwest side of the site. 6. B. 14. f.: Item is not complete. No traffic study is required since the peak is less than 10 trips. - a . (, whw � �d PRE-DEVELOPMENT INFORMATION FEDERAL WAY BUILDING SECTION 661-4118 Le,MM- {4-( 1E cvl() 4 ( 01510 0 PROJECT NAME OCCUPANCY TYPE CONSTRUCTION 1. Submit with completed application for permit, seven complete sets of plans of 24"x36" maximum dimension(include architectural,structural,electrical,drainage,utilities,and landscaping). Provide three each 81/2"x11" and Lb= full size site plans for addressing multiple building sites. ._. 2. At submittal provide imo sets of structural calculations prepared by a professional engineer, registered in the State of Washington. )(3. At submittal provide tag..,copies of soil investigations a d repo , as specified ' Chapter 29 of the Uniform Building Code. to r q G� lots' o 1 7 b ' y fr-egtel sly e. 4. At submittal provide two sets of energy code calculations, including lighting budget. Washington State Energy Code (1991). _., S. Provide t copies of King County Health Department approved drawings. 6. At the time of submittal, those regulations which are currently in effect shall be applicable to all project plans and specifications. The City of Federal Way has currently adopted all Uniform Codes, 1991 editions. 7. Washington State Disability Free Standards apply (WAC 51-20). 8. Special inspection by an approved testing laboratory is required for site welding, high-strength bolting, piling operations,sprayed-on fireproofing,structural masonry,and cast-in-place concrete. Include testing Iab selection and personnel credentials with building permit submittal for Building Section approval prior to construction (must be WABO certified agency and inspectors on January 1, 1994). 9. Separate permits are required for demolition, signs, rack storage, rockeries, etc., refer to Washington State Department of L & I for electrical permits. Plumbing and mechanical should be included on the main application for permits, described in #1 above. 10. Revisions to submitted drawings will be subject to additional plan review fees, if on larger sheets than 81h"x11". 11. Minimum estimated fireflow.(gpm) , 12. Provide TWO FULL SIZE SITE PLANS APPROVED BY THE FEDERAL WAY POSTMASTER, showing approved locations, when installing gang-type mail boxes. 13. No building or portion of a building shall be occupied or used for storage prior to the issuance of the CERTIFICATE OF OCCUPANCY. V14. No work shall start prior to the issuance of the permit. 15. Other: {/ C' 19 - 7,8- 3 PREPARED BY DATE y,EDEv. TECHNICAL REVIEW COMMERCIAL Agenda Date: October 28, 1993 Subject: West Hill Subdivision SUB93-0002 SEP93-0019 UPR93-0014 To: Mike Thomas From: Pat Kettenring, Fire Marshal's Office WATER SUPPLIES FOR FIRE PROTECTION NVA When any portion of the facility or building protected is in excess of 150 feet from a water supply on a public street, as measured by an approved route around the exterior of the facility or building, on site fire hydrants and mains capable of supplying the required fire flow shall be provided. [UFC 10.401] Ot- Hydrants shall be located not more than 300 feet on center. Such distances shall be measured on the path of vehicular access. [Administrative Policy 10.004] 1s/i3 Hydrants shall not be located closer than 50 feet to any building. [Administrative Policy 10.004] V When exposed to vehicular damage, fire hydrants shall be suitably protected. [UFC 10.105d] ✓ Curb areas in front of hydrants or Fire Department Connections may be marked fifteen (15) feet on either side as fire lanes. [KCFPR #111] V Hydrants shall not be obstructed by any structure or vegetation, nor shall the visibility of the hydrant be impaired for a distance of 50 feet in the direction of vehicular approach to the fire hydrant. [Administrative Policy 10.004] V Fire hydrant locations are subject to the approval of the Fire Marshal or his/her designee. [Administrative Policy 10.004] ✓ Fire hydrants shall be in service PRIOR to the start of combustible construction. [UFC 10.502] • ✓ Existing fire hydrants on public streets are allowed to be considered as available for the project. Existing fire hydrants on adjacent properties shall not be considered available unless fire apparatus access roads extend between properties and easements are established to prevent obstructions of such roads. [UFC Appendix III-B] V A Certificate of Water Availability shall be provided indicating the fire flow available at the site. [UFC 10.402] Olt- It has been determined this project will require hydrants. existing hydrants are considered available to this project. This will require the addition of hydrants for this project. [UFC Appendix Ill-B] FIRE DEPARTMENT ACCESS ROADWAY (:Y- Plans for fire apparatus access roads shall be submitted to the fire department for review and approval prior to construction. [UFC 10.202] OK— During construction, an all-weather fire department access roadway is required when any portion of an exterior wall of any facility, building or portion of a building is more than 150 feet from a fire department access roadway. [UFC 10.203] EXCEPTION: provisions for a sprinklered building. All fire department access roadways shall be constructed of an all-weather surface capable of supporting a 25 ton vehicle; the maximum roadway grade shall not exceed 12 percent. ✓ All fire department access roadways shall have (1) a clear and unobstructed width of not less than 20 feet, (2) an overhead clearance of not less than 13 feet six inches, (3) all turns or bends shall be designed at not less than a 32 foot inside and 40 foot outside turning radius. ✓ All fire department access roadways which have dead ends exceeding 150 feet shall be provided with a cul-de-sac at the dead end. All such cul-de-sacs shall be not less than 80 feet in diameter. 1\i/►a Designated fire lanes may be required for emergency access. This may be done during the plans check or after the facility is in operation. 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. [UFC 10.206] FIRE DEPARTMENT ACCESS TO BUILDINGS 1,7 Approved numbers or addresses shall be placed on all new and existing buildings in such a position as to be plainly visible and legible from the street or road fronting the property. Said numbers shall contrast with their background. [UFC 10.301 I'l/a When access to or within a structure or area is unduly difficult because of secured openings or where immediate access is necessary for life-saving or firefighting purposes, the chief is authorized to require a key box to be installed in an accessible location. The key box shall be a type approved by the chief and shall contain keys to gain necessary access as required. [UFC 10.302] ADDITIONAL COMMENTS: LDC_Ar1OVJ (�5 ����� uT r S Air 1>17-oA)6 THESE COMMENTS VALID FOR 180 DAYS FROM REVIEW AND ONLY FOR THE PLANS REVIEWED. 10(27/�3 Reviewed by: Review Date: October 15, 1993 TECHNICAL REVIEW COMMITTEE PROJECT PLANNER: Mike Thomas PLEASE RESPOND BY: October 28, 1993 - Staff Discussion TYPE OF PERMIT REQUIRED: Preliminary Plat Approval FILE NUMBERS: SUB93-0002, SEP93-0019, UPR93-0014 PROJECT NAME: West Hill Subdivision PROJECT ADDRESS: 7th Way S.W. and S.W. Campus Prkway PROJECT DESCRIPTION: The applicant is proposing to subdivide 1.94 acres into 7 single family lots. CONTACT: Paul Krakow, Parco Group 4303 N. Ruston Way Tacoma, Wa 98402-5374 Phone: 756-9921 For the October 28, 1993 meeting, please prepare the following: 1) A list of any additional submittal requirements needed; 2) SEPA comments; and, 3) Any other comments or concerns regarding the plat application. If you have any questions, please contact me at 84104. 10/06/93 15:23 FAX 206 646 8300 QUADRANT CORP g001 QUADRANT T ------- Quadrant RCM,:Ji1+ 5UC N.E 8ti at;i i A -Compar P.U.Box 13C an�rye�naer,�e� v 1OltOvL ,Washingtu SECCG i 20ffi,4SA-29CC Fa ( r) )54 -R3CC October 6, 1993 Transmitted via FAX - (206) 756-9366 -,. COMMUNITY DEVELOPMENT DEPARTMENT OCT 13 1993 Mr. Michael Thomas ' City of Federal Way 33530 1st Way S. Federal Way, WA 98003 Dear Mr. Thomas: We are the owner of the two acre parcel located at 7th Way S.W., adjacent to Campus Drive. Parro has entered into a Purchase and Sale Agr;:ement with Quadrant to purchase the site upon preliminary plat approval. They are authorized by us to submit application for a seven lot preliminary plat on this property. Please call me directly at 646-8314 if you have any questions. Very truly yours, THE QUADRANT CORPORATION C.. Peter M. Orser Vice President PMO:jz CITY OF FEDERAL WAY MEMORANDUM DATE: March 15, 1994 TO: Land Use / Transportation Committee FROM: Gregory D. Moore, AICP - Director of Community Development Services 244` Contact: Mike Thomas, Associate Planner() RE: Preliminary Plat of Westhill Federal Way File No. SUB93-0002 Related File No.'s UPR93-0014, SEP93-0019 SUMMARY OF APPLICATION The applicant is requesting preliminary plat approval to divide 1.94 acres into seven (7) single family residential lots as provided for under Chapter 20, Subdivisions, Federal Way City Code and Chapter 58.17 Revised Code of Washington. City of Federal City Code sets forth subdivision review process as Process III review. Under Process III review the hearing examiner conducts a public hearing on the matter, and after consideration of testimony and facts presented makes a recommendation to the City Council. The City Council possess final authority to grant or deny the plat request. II. REASON FOR COUNCIL ACTION Bringing this matter before the City Council Land Use Committee / Transportation for review and recommendation prior to the full Council is consistent with how land use matters are currently processed by the City. III. HEARING EXAMINER'S RECOMMENDATION It is hereby recommended to the City Council of the City of Federal Way that the request for Process III approval for the preliminary plat of Westhill be approved subject to the mitigating measures set forth in the Mitigated Determination of Nonsignificance (MDNS). MDNS conditions can be found on page 4 of the Staff Report. Pages 2 through 5 of the Hearing Examiner's Recommendation contain findings and conclusions that serve as a basis for the recommendation. 1 IV. PROCEDURAL SUMMARY October 13, 1993 Application submitted for Process III and Preliminary Plat Approval. December 13, 1994 Mitigated Determination of Nonsignificance issued for the project. February 1, 1994 Hearing Examiner hearing held. March 1, 1994 Hearing Examiner determination issued recommending project approval as proposed. March 7, 1994 Land Use Committee meeting. Committee deferred decision until March 21, 1994 meeting. March 21, 1994 Land Use Committee meeting. April 5, 1994 City Council meeting. Pursuant to Section 490 of the Federal Way City Code, the City Council shall consider the application at a scheduled meeting. V. DECISIONAL CRITERIA City Council's review of the application is limited to the record of the hearing before the Hearing Examiner, the Examiner's written report, compliance with review criteria set forth in Section 22-490(d) of the Federal Way City Code and other applicable ordinances and regulations of the Federal Way Code. Section 22-490(d) requires that the application be approved if it is consistent with: 1. The Comprehensive Plan, 2. All applicable provisions of the Code, including those adopted by reference from the Comprehensive Plan; and, 3. Public health, safety and welfare. Finding #14 of the Hearing Examiner's recommendation describes how the application is consistent with these criteria. VI. COUNCIL ACTION After consideration of the record, the City Council may by action approved by a majority of the total membership, take one of the following actions: 2 1. Approve the Application; or, 2. Approve the Application with minor modifications; or, 3. Deny the Application; or 4. Remand the matter back to the Hearing Examiner for further consideration; or, 5. Schedule a public hearing before the City Council, in order to consider non-minor modifications to the application. The City Council shall not substantially modify the recommendation of the Hearing Examiner without first referring the matter back to the Hearing Examiner or conducting its own public hearing on the application. 3 CITY OF = I L (206)661-4000 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 December 1, 1993 Mr. Paul Krakow Parco Group, Ltd. 4303 North Ruston Way Tacoma, WA 98402-5374 RE: West Hill Preliminary Plat FW File Number SUB93-0002 Dear Mr. Krakow: Absent from my November 12, 1993, letter was Public Works comments regarding the above referenced project. Below you will find applicable comments regarding submittal requirements and likely mitigation measures. Also, please find attached a Preliminary Plat Review Checklist. Storm Drainage, Grading & Erosion Control 1. On-site detention is required in accordance with the 1990 King County Surface Water Design Manual (KCSWDM) and recommendation of BW-2 of the Hylebos Creek and Lower Puget Sound Basin. However, as previously discussed, the option exists for using Panther Lake Surface Water Facility for storm water detention. The Level 2 Downstream Analysis indicates that the downstream conveyance system has adequate capacity to handle site runoff to Panther Lake. Therefore, no downstream improvements are required other than channel clearing. Staff concurs with the Level 2 Downstream Analysis that trash and debris be removed from the stream as well as trimming woody vegetation, consisting mainly of young alder trees. An engineering plan and supporting calculations will be required during plat improvement design showing the driveway/roof runoff collection system from the proposed lots to the stream. If determined feasible by the City, it shall be your responsibility to retrofit a FROP style oil/water separator in the existing catch-basin that discharges into a 30" CMP and into the stream as part of the required plat improvements. 2. A preliminary grading plan showing 2-foot contours needs to be submitted as part of the preliminary plat review process. Please assume a 2,000 square foot building pad and a 20-foot wide driveway. 3. A Temporary Erosion/Sedimentation Control plan needs to be submitted for engineering review. The Plan shall address control measures proposed during site grading and construction. Mr. Paul Krakow December 1, 1993 Page 2 Preliminary Plat Mitigation The following mitigation measures are noted as part of the comments received from the Public Works Department. The following should not be considered an all inclusive list of mitigation for this project. Mitigation measures are as follows: 1. In order to utilize Panther Lake for storm water detention purposes a pro-rata share contribution for the capital costs of the Panther Lake Surface Water Facility will need to be made in the amount of $1,800/acre. The total amount payable prior to recording of the plat will be $3,942.00 dollars. 2. Proposed Tract "B" and "C" shall be dedicated to the City for storm drainage and open space respectively. 3. The existing dirt road along the northeast side of the stream will need to be improved for access and maintenance of the stream. The road shall be improved to 12 feet wide and surfaced with grass-pavers for the entire length of the property. 4. A mass grading plan shall be submitted for this development. As noted above, please assume a building pad of 2,000 square feet and a 20-foot driveway for each lot. All disturbed areas shall be seeded after grading. Site grading shall be accomplished prior to recording of the proposed plat. If you have any questions regarding this letter or your project in general, please feel free to contact my office at 661-4104 or Jeff Sharp, Engineering Plans Reviewer, at 661-4125. Sincerely, Michael Thomas Associate Planner end: Preliminary Plat Review Checklist c: Kathy McClung, Land Use Administrator Jeff Sharp, Engineering Plans Reviewer Rich Tomkins, Pacific Design Engineering CITY OF = E • EMAIL_� (206)661-4000 IN)N) IFTY' 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 November 12, 1993 Mr. Paul Krakow Parco Group, Ltd. 4303 North Ruston Way Tacoma, WA 98402-5374 RE: West Hill Preliminary Plat FW File No. SUB93-0002 Dear Mr. Krakow: On October 28, 1993, the City's Development Review Committee met to review your formal application for preliminary plat approval. At the writing of this letter, comments from the City's public works department were unavailable. As soon as they are compiled I will forward them to you. The comments below were generated from our review. Fire Department Please find attached a copy of the Fire Department's comments. The fire hydrant locations are approved as submitted. Federal Way Water & Sewer Water: A Developer Extension Agreement (DEA) will need to be entered into with the District for the proposed relocation of the hydrant. Sewer: Sewer service shall be provided from the proposed residences to the existing sewer main by side sewer connection only. A certificate of water and sewer availability needs to be obtained from the District and submitted to the City. Building Department The following Building Department comment applies only to the construction of any residence within the proposed plat: For those lots with a slope of twenty (20) percent or greater, a soils investigation and report, as specified in Chapter 29, Uniform Building Code, will need to be provided. Mr. Paul Krakow November 12, 1993 Page 2 Planning Department Please submit a recent title report for the subject property. The information is needed to check for any easements or restriction on the subject property. Presently, within King County there are plats with the names of"West Hill Addition" and "West Hills Addition." In order to avoid confusion later, you may wish to rename your plat. At this point in the review process, the City is preparing the required documents needed to issue a SEPA determination. If you have any questions regarding this letter or your plat application, please feel free to contact my office at 661-4104. Sincerely, ichael Thomas Associate Planner c: Kathy McClung, Land Use Administrator Jeff Sharp, Engineering Plans Reviewer III Richard Tomkins, Pacific Engineering Design, Inc. JACOBSON CONS'A 'TION&DEVELOPMENT, INC 33430 13th Place South, Suite 300 Federal Way, WA 98003 (206) 927-3699 COMMUNITY Lit_ LLU MENT DEPARTMENT May 11, 1995 MAY 1 1 1995 Mr. Bill Kingman City of Federal Way 33530 1st Way South Federal Way, WA 98003 Re: West Hills Plat Dear Bill: Per our conversation today, I would like to request a change to the West Hill Plat. The Plat calls for the installation of a 6 foot high, permanent fence along the west property line of Lot 5. I would like to install approximately 110 of fencing along the "Limits of Clearing" shown on the Plat so that I can complete the logging of Lots 4 and 5. After I finish logging, I will complete the remainder of the fence so that it complies with the Note on the Plat. I appreciate any help you can provide. Very truly yours, Jacobson Construction&Development,Inc. J. Scott Griffin, Jr. Vice President MEETING DATE: April 5, 1994 ITEM# CITY OF FEDERAL WAY City Council AGENDA ITEM SUBJECT: WESTHILL PRELIMINARY PLAT CATEGORY: BUDGET IMPACT: _X_CONSENT _X_RESOLUTION Amount Budgeted: $ _ORDINANCE _X STAFF REPORT Expenditure Amt: $ _BUSINESS _PROCLAMATION Contingency Reqd: $ _HEARING STUDY SESSION FYI OTHER ----------------------------------------------------------------------------- ATTACHMENTS: 1) Draft Resolution to recommend approval of Westhill Preliminary Plat. 2) March 15, 1994 cover memo to the City's Land Use Committee. 3) March 1, 1994 Hearing Examiner recommendation(attached to resolution). 4) Department of Community Development Services staff report. SUMMARY/BACKGROUND: The applicant is requesting preliminary plat approval to divide a 1.94 acre parcel into seven (7) single family residential lots. The March 15, 1994 memorandum to the Land Use / Transportation Committee contains a summary of the hearing examiner's recommendation, procedural summary, and decisional criteria pertinent to process III review. The Land Use / Transportation Committee recommended approval at their March 21, 1994 meeting. CITY MANAGER RECOMMENDATION: The City Manager recommends approval of the land use application as recommended by the Federal Way Hearing Examiner. (BELOW TO BE COMPLETED BY CITY CLERK'S OFFICE) COUNCIL ACTION: _APPROVED COUNCIL BILL # _DENIED ORDINANCE # TABLED/DEFERRED/NO ACTION RESOLUTION # COMMUNITY DEVELOPMENT TECHNICAL REVIEW COMMITTEE AGENDA OF: October 28, 1993 ATTN: Mike Thomas Associate Planner FROM: Federal Way Water and Sewer SUBJECT: Agenda Item No. 2 West Hill Subdivision SUB 93-0002 COMMENTS: Water: There is an existing water main within 7th Way Southwest. If hydrant is to be relocated, as proposed, owner will be required to enter into a Developer Extension Agreement with the District. Sewer: There is an existing sewer main within 7th Way Southwest. Service should be provided by side sewer connection only. General: There are existing plats within King County with the names "West Hill Addition" and "West Hills Addition. By: Date: /0-ZS--93 3 es+-- }-1 it Lv4 C to s - ceS r Command= 9- Thomas Land Surveying Job->#1 95011 Scott Griffin [271] Bearing Distance Pnt . Northing _ Fasting _ Type 05-30-1995 14 :21 :27 C: \BMDATA\95011 Command= 134- Group #= 1 LOT 1 7 10135 .2825 9897 . 9791 S37-01-16 . 0E 153 .439 8 10012 . 7746 9990 . 3663 S52-58-44 . 0W 54 . 000 9 9980 .2607 9947 .2519 N37-01-16 . 0W 184 . 616 18 10127 . 6607 9836 . 0929 INT N82-58-44 . 0E 62 .354 7 10135 .2825 9897 . 9791 Final Area= 9127 Square Feet 0 .21 Acres Group #= 2 LOT 2 18 10127 . 6607 9836 . 0929 INT S37-01-16 . 0E 174 . 616 10 9988 .2449 9941 .2308 S52-58-44 . 0W 52 . 000 11 9956 . 9352 9899 . 7133 N37-01-16 . 0W 200 . 769 19 10117 .2318 9778 . 8285 INT S14-43-02 . 6E 372 . 000 5 9757 .4369 9873 .3357 N07-01-16 . 0W 372 . 000 6 10126 . 6473 9827 . 8643 Delta = 07-41-46 . 6 Radius Length = 372 . 000 Arc Length = 49 .969 Tangent Length = N75-16-57 .4E N82-58-44 . 0E 25 . 022 Chord Length = N79-07-50 . 7E 49 .932 N82-58-44 . 0E 8 .291 18 10127 . 6607 9836 . 0929 INT Final Area= 9802 Square Feet 0 .23 Acres Group #= 3 LOT 3 // 19 10117 .2318 9778 . 8285 INT S37-01-16 . 0E 190 . 769 12 9964 . 9193 9893 . 6922 S52-58-44 . 0W 52 . 000 13 9933 . 6096 9852 . 1747 N37-01-16 . 0W 207 . 752 20 10099 .4819 9727 . 0852 INT S23-09-01 . 6E 372 . 000 5 9757 .4369 9873 .3357 N14-43-02 . 6W 372 . 000 19 10117 .2318 9778 . 8285 INT Delta = 08-25-58 . 9 Radius Length = 372 . 000 Arc Length = 54 . 753 Tangent Length = N66-50-58 .4E N75-16-57 .4E 27 .426 Chord Length = N71-03-57 .9E 54 . 703 Final Area= 10398 Square Feet 0 .24 Acres Group #= 4 LOT 4 V 20 10099 . ) 9727 . 0852 INT S37-01-16 . OE 197 . 752 14 9941 . 5938 9846 . 1536 S52-58-44 . 0W 52 . 000 15 9910 .2841 9804 . 6361 N37-01-16 . 0W 206 . 737 21 10075 .3460 9680 . 15.76 INT -S3-l-17-06 . 1E 372 .00-0 - 5 9757 .4369 9873 . 3357 N23-09-01 . 6W 372 . 000 20 10099 .4819 9727 . 0852 INT Delta = 08-08-04 . 6 Radius Length = 372 . 000 Arc Length = 52 . 815 Tangent Length = N58-42-53 . 9E N66-50-58 .4E 26 .452 Chord Length = N62-46-56 . 1E 52 . 771 Final Area= 10550 Square Feet 0 .24 Acres Group #_ ,5 LOT 5 ✓/ 21 10075 . 3460 9680 . 1576 INT S37-01-16 . 0E 206 . 737 15 9910 .2841 9804 . 6361 S52-58-44 . 0W 47 . 667 16 9881 . 5836 9766 . 5784 N46-29-00 . 0W 14 . 196 22 9891 . 3581 9756 .2842 N37-01-16 . 0W 194 . 598 23 10046 . 7276 9639 . 1152 N52-58-44 . 0E 12 . 820 4 10054 .4468 9649 . 3511 S37-01-16 . 0E 372 . 000 5 9757 .4369 9873 .3357 N31-17-06 . 1W 372 . 000 21 10075 . 3460 9680 . 1576 INT Delta = 05-44-09 . 9 Radius Length = 372 . 000 Arc Length = 37 .242 Tangent Length = N52-58-44 . 0E N58-42-53 .9E 18 . 637 Chord Length = N55-50-48 .9E 37 .227 Final Area= 10391 Square Feet 0 .24 Acres Group #= 6 TRACT 'A' ,/ 1 10000 . 0000 10000 . 0000 S52-58-44 . 0W 250 . 000 17 9849 .4727 9800 . 3966 N46-29-00 . 0W 46 . 635 16 9881 . 5836 9766 .5784 N52-58-44 . 0E 99 . 667 14 9941 . 5938 9846 . 1536 537-01-16 . 0E 10 . 000 13 9933 . 6096 9852 . 1747 N52-58-44 . 0E 52 . 000 12 9964 . 9193 9893 . 6922 S37-01-16 . 0E 10 . 000 11 9956 . 9352 9899 . 7133 N52-58-44 . 0E 52 . 000 10 9988 .2449 9941 .2308 S37-01-16 . 0E 10 . 000 9 9980 .2607 9947 .2519 N52-58-44 . 0E 54 . 000 8 10012 . 7746 9990 . 3663 S37-01-16 . 0E 16 . 000 1 10000 . 0000 10000 . 0000 Final Area= 8496 Square Feet 0 .20 Acres Group #= 7 TRACT 'B' J/ 3 9986 . 5168 9559 .2740 N52-58-44 . 0E 100 . 000 23 10046 . 7276 9639 . 1152 S37-01-16 . 0E 194 . 598 22 9891 . 3581 9756 .2842 • S46-29-00 . 0E 60 . 830 17 9849 . 4 9800 . 3966 S52-58-44 . 0W 110 . 000 2 9783 .2407 9712 . 5711 N37-01-16 . 0W 254 . 600 3 9986 . 5168 9559 .2740 Final Area= 25760 Square Feet 0 . 59 Acres Group #= 2- P. 01 w Thomas Land Surveying 11309 46th Street East Puyallup, WA 98372 Phone 863-2321 (Fax 863-9897) Date June 19, 1995 Please Forward Telecopy to: Julie Venn (Planning Dept.) Re: Final Plat of West Hill Fax# 661-4192 Total of Pages Including This Page 2 Sent By: Scott L. Thomas, P.L.S. Please Call 863-2321 If Telecopy Is Incomplete or Illegible Remarks: Julie Venn: Please find attached a copy of the lot closure for the total boundary for the final plat of West Hill. If you need any additional information please do not hesitate to contact me. Scott Thomas, P.L.S. P. e2 Comment= Boundary Closure - West Hill West Hill Boundary Closure 3 9986 . 5168 9559 .2740 N52-58-44 .OE 112 . 820 4 10054 .4468 9649 .3511 S37-01-16 . 0E 372 .000 5 9757 .4369 9873 .3357 N07-01-16 .0W 372 . 000 6 10126 . 6473 9827 . 8643 Delta = 30-00-00 . 0 Radius Length = 3.72 . 000 Arc Length = 194 . 779 Tangent Length = N52-58-44 . 0E N82-58-44 . 0E 99 . 677 Chord Length = N67-58-44 . 0E 192 . 561 N82-58-44 . 0E 70 .645 7 10135 .2825 ' 9897 .9791. S37-01-16 .0E 169.. 439 1 10000 . 0000 10000 . 0000 S52-58-44 . 0W 360 .000 2 9783 .2407 ' 9712 .5711 N37-01--16 .014 254 . 600 3 9986 .5168 . 9559 .2740 Final Area= 84524 Square Feet 1 .94 Acres Command= 2- CITY OF • (206)661-4000 > 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 August 15, 1995 Jacobson Construction and Development Attn: Scott Griffin 33430- 13th Place S, #300 Federal Way, Washington 98003 RE: FINAL PUNCH LIST FOR WEST HILL PLAT SUB 93-0002 An inspection of site work of this project was made on August 14, 1995 by a Public Works Inspector. Based on that inspection, the enclosed punchlist of deficiencies was prepared. Please note, this is an official punchlist and is valid for 30 days. Additions or deletions will not be made within 30 days without expressed review and approval of a Federal Way Public Works Department representative. Any extensions to the 30 day limit must be approved by the inspector. Deviations from this policy should be reported to the Public Works Department at 661-4137. Upon completion of the attached punchlist items, the following non-construction related requirements must be met: • Prior to any further release of bond quantities, reproducible mylar (without mack- tack), or photographic "shot" copies of record drawings (as constructed with all appropriate design changes), shall be provided to the City. • All administrative and inspection fees shall be paid in full, with a check made out to the City of Federal Way. To date, the inspection fee is $947.50. Additional fees for final inspection and as-built plan review must be paid prior to release of bond. • A maintenance bond in the amount of 30% of the cost of replacing the materials covered by the performance bond shall be posted prior to the release of the performance bond. As an option, the existing bond can be reduced in value to the amount required. This bond will be kept for a two-year maintenance period from the time of final project acceptance. Prior to termination of this maintenance period, the City will conduct inspections to note any defects in workmanship, function, or materials which must be repaired prior to the City's final acceptance of the facility. The cost of these inspections must be paid prior to release of the maintenance bond. West Hill Plat August 15, 1995 Page 2 Please contact me at 661-4128 within one week of the date of this letter, with your schedule for completing these items. When all corrections have been completed, a follow- up inspection will be held with your representative. If we determine that all deficiencies have been corrected, we will notify the appropriate departments of our approval. Please do not hesitate to contact me should you have any questions regarding this matter. Sincer Jim ryal P lic Works Inspector Enclosure cc: Don Olson Construction, P.O. Box 930, Sumner, Washington 98390 Ron Garrow, Senior Development Engineer Ken Miller, Street Systems Manager Jeff Pratt, Surface Water Manager JP:jd K:\DEVREV\PROJECTS\WESTHILL.LST FINAL PUNCH LIST WEST HILL PLAT STORM Existing CB (7th Way SW) - Regrout under pipe, and regrout frame and section. CB #1 - Regrout pipes and section. Backfill to grade. Yard Drains - Grout sections. Place to grade. Existing CB (N end of site) - Regrout adjustment bricks and frame. Clean all catch basins SITE WORK Asphalt patch along curb has settled. Replace patch and remove tack from curb. Backfill sidewalk and curb to grade. Provide mailbox stand. Rockery wall - provide soils engineer sign off and chink all voids. Provide fence along west side of Lot 5. Hydroseed all disturbed ground. Remove silt fence after grass is established. Regional stream - Establish good sturdy grass growth or armor with rip-rap (remove silt fence to establish vegetation). K:\DEVREV\PROJECTS\WESTHILL.LST MEETING DATE: April 5 1994 ITEM# �0� CITY OF FEDERAL WAY T6T City Council AGENDA ITEM SUBJECT: WESTHILL PRELIMINARY PLAT CATEGORY: BUDGET IMPACT: _ _X_CONSENT X_RESOLUTION Amount Budgeted: $ _ORDINANCE IX STAFF REPORT Expenditure Amt: $ _BUSINESS PROCLAMATION Contingency Reqd: $ _HEARING STUDY SESSION FYI OTHER ATTACHMENTS: 1) Draft Resolution to recommend approval of Westhill Preliminary Plat. 2) March 15, 1994 cover memo to the City's Land Use Committee. 3) March 1, 1994 Hearing Examiner recommendation(attached to resolution). 4) Department of Community Development Services staff report. SUMMARY/BACKGROUND: The applicant is requesting preliminary plat approval to divide a 1.94 acre parcel into seven (7) single family residential lots. The March 15, 1994 memorandum to the Land Use / Transportation Committee contains a summary of the hearing examiner's recommendation, procedural summary, and decisional criteria pertinent to process III review. The Land Use / Transportation Committee recommended approval at their March 21, 1994 meeting. CITY MANAGER RECOMMENDATION: The City Manager recommends approval of the land use application as recommended by the Federal Way Hearing Examiner. (BELOW TO BE COMPLETED BY CITY CLERK'S OFFICE) COUNCIL ACTION:/AP /'�y PROVED / S/ 9 COUNCIL BILL # DENIED ORDINANCE # y� TABLED/DEFERRED/NO ACTION RESOLUTION # 9 —J 6P RECEIVED BY COMMUNITY DEVELOPMENT DEPARTMENT MAR 0 1 1994 EXHIBIT "A" CITY OF FEDERAL WAY OFFICE OF THE HEARING EXAMINER IN THE MATTER OF: FWHE#: 94-6 FILE #: SUB-93-0002 UPR-93-0014 PRELIMINARY PLAT OF WESTHILL ) SEP93-0019 I. SUMMARY OF APPLICATION The applicant is requesting preliminary plat approval to divide a 1.94 acre parcel into seven (7) single family residential lots as provided for under Chapter 20, Subdivisions, Federal Way City Code and Chapter 58. 17 Revised Code of Washington (RCW) . City of Federal Way City Code sets forth subdivision review process as Process III review. Under Process III review the hearing examiner conducts a public hearing on the matter, and after consideration of testimony and facts presented makes recommendation to the City Council who possess final authority to grant or deny the plat request. II. PROCEDURAL INFORMATION Hearing Date: February 1, 1994 Decision Date: March 1, 1994 At the hearing the following presented testimony and evidence: 1. Michael Thomas, Associate Planner, City of Federal Way 33530 - 1st Way South, Federal Way, WA 98003 2 . Rick Tompkins - 130 Andover Park East, Suite 300, Seattle, WA 3 . Henry Griffin - 4303 North Ruston Way, Tacoma, WA 4 . Jeff Sharp, Public Works Department, City of Federal Way - 33530 1st Way South, Federal Way, WA 98003 • At the hearing the following exhibits were_ admitted-as- part- of the official record of these proceedings: 1 . Staff Report with attachments III. FINDINGS 1. The Hearing Examiner has heard testimony and taken this matter under advisement. 2 . The Community Development Department staff report sets forth general findings, applicable policies and provisions in this matter, and is hereby marked as Exhibit 1 and incorporated in this report by reference as though set forth in full herein. 3. All appropriate notices were delivered in accordance with the requirements of the Federal Way Zoning Code. 4 . The applicant has a possessory ownership interest in a 1.94 acre parcel of property located on the south side of 7th Way S.W. immediately east of its intersection with 336th Street within the city limits of Federal Way. The site is a - rectangular shaped parcel of property bordered on the north by the 7th Way S.W. right of way and on the south by the Bonneville Power Administration transmission line easement. The extreme western portion of the site is bisected by a drainage ditch/intermittent stream which flows into the Panther Lake regional detention facility. The stream flows through a culvert beneath 7th Way S.W. , empties onto the applicant's parcel, and flows basically in a straight line to the south property line. Adjacent to the stream is a dirt road which extends from 7th Way to the bank of the stream, and then alongside the stream to the south property line. 5 . The applicant is requesting preliminary plat approval to allow subdivision of the site into 7 single family residential lots with lot sizes ranging between 7,200 and 7,400 square feet. The proposed lots are long and narrow, extending south from 7th Way S.W. Lots 3 through 7 are the most narrow lots with widths of 36 feet. The site is located within the RM 2400 zoning district which allows multi family dwellings. Said zone classification also allows single family dwellings with a minimum lot size of 5,000 square feet and five foot side yard setbacks (Section 22.666 Federal Way City Code [FWCC] ) . The applicant's building envelope on lots 3 through 7 is only 26 feet wide, but the proposed plat conforms with the bulk requirements of the RM 2400 zoning district. 6. The site naturally drains into the stream, traversing the west portion of the site. Soils on the. site are classified as Alderwood and Everett gravelly sandy loam which are moderately well drained. The soil is generally suitable for single family construction. The topography of the site slopes down from east to west with slopes reaching •40% along the eastern boundary. Vegetation is a mixture of second and third growth coniferous and broad leafed trees native to the Pacific Northwest. The applicant is required to retain 25% of the significant trees in accordance with the FWCC. There are no significant endangered or threatened plant or wildlife species on the site. 7 . Surrounding development includes The Ridge, a single family subdivision located west of the site, and the Glen Park Apartment Complex to the north. To the west, across Campus Drive, is the Highlands Development, while to the south is the King County Aquatic Center and its associated recreational opportunities. The proposed subdivision of the site into seven single family residential lots is compatible with existing development. 8. Each lot will access directly onto 7th Way S.W. which is approved to full street standards including vertical curbs, gutters and sidewalks. No further street improvements are required. The applicant is providing open space in the nature of a 50 foot wide tree retention area that will act as a buffer between the building envelopes and the BPA easement. Restrictive covenants will prevent tree cutting in the retention area designated on the face of the plat. The plat reflects a 20 foot buffer between the building areas of the lot and 7th Way S.W. 9. The site will generate approximately seveb p.m. peak hour vehicle trips and 67 average daily trips. Such volume is not sufficient to require a traffic study. Public transit is available approximately one-quarter mile from the site. 10 . The schools serving the site are Panther Lake Elementary, Illihee Junior High, and Federal Way Senior High. All schools have adequate capacity to serve students residing in the plat. 11. The Federal Way Water and Sewer District will provide both domestic and fire flow water to the site, and the fire district has approved the location of fire hydrants to serve the site. 12 . The only issue which arose between the applicant and staff concerned mitigating measure no. 1 contained in the MDNS. This measure requires that the applicant widen the dirt road alongside the stream to 12 feet, and surface it with grass pavers or other approved surfacing material for its entire length. The applicant objects, stating that he is already providing a 50 foot buffer for the intermittent stream/drainage ditch and that resurfacing and widening the road will interfere with the buffer. The applicant also states that grass pavers are extremely expensive for a seven lot single family subdivision. As an alternative, the applicant offers to provide a gravel surface over the existing road. The City responds by stating that the plat is providing neither detention or retention of storm water, but is directly - discharging all plat drainage into the stream. Access is required for any storm water facility such as biofiltration swales and detention ponds. Maintenance will also be required for this stream to remove accumulation of trash, woody plants, and trees that are interfering with the stream channel. The City also indicates that plastic grass pavers are available at approximately 25% of the cost indicated by the applicant. The City objects to a gravel surface, as during large storm events, the water may cover the gravel surface and wash it away. 13 . The requirement for improving the existing road and surfacing it with grass pavers is a mitigating measure required by the MDNS which was issued on December 13, 1993. The MDNS became final on December 31, 1993. The final paragraph of the MDNS reads as follows: Unless modified by the City, this determination will become final following the above comment deadline [December 31, 1993] . Any person aggrieved of the City's determination may file an appeal with the City within 14 days of the above - deadline. The above language is consistent with Section 18 .51(a) FWCC which states as follows: Any interested party may appeal to the Hearing Examiner a threshold determination, or the adequacy of a final environmental impact statement and conditioning or denial of an action. . . . (c) all appeals filed under this section must be filed in writing with the City Clerk within 14 calendar days of the date of the decision appealed or the conclusion of the comment period or completion of the giving of required notices, whichever is longer. The Hearing Examiner has no jurisdiction to hear an appeal of a decision of the City of Federal Way environmental official unless a timely appeal is filed. Therefore, the Examiner has no authority to grant relief to the applicant. However, following review of the issue, it is the Examiner's opinion that it is reasonable for the city to require an access to the stream for maintenance personnel and equipment. It is questionable whether such access needs to be provided for the entire length of the property and to the specifications required by the City. 14 . Preliminary plats are processed through Process III review criteria as set forth in Section 22-490 (d) FWCC. Findings required on each criteria are hereby made as follows : A. The project is consistent with the City of Federal Way Comprehensive Plan. Both single family and multi family uses are allowed in the zone classification of RM 2400 . The 1990 --Federal Way Comprehensive- Plan designates the area as high density residential. The applicant's proposed use is much less intense than a multi family development and will have less impact on City services and facilities than if developed in accordance with the comprehensive plan and zone classification. The project also meets numerous comprehensive plan policies which address adequate services, zoning, transportation, minimum areas for subdivisions, maintenance standards, vegetation, open space and landscape buffer zones. B. The project is consistent with all applicable provisions of the Federal Way Zoning Code. The site meets the lot size, yard, lot coverage, parking and sign requirements, as well as all other bulk regulation of the RM 2400 zoning district. The project is also consistent with the Environmental Policy Code, Methods to Mitigate Development Impacts Code, Federal Way Subdivision Code, and all other applicable development codes and regulations. C. The project is consistent with the public health, safety and welfare. The applicant is proposing a substantially less dense project than allowed by both the comprehensive plan and the zoning. The project is consistent with existing development in the Lmmediate area. 15 . The proposed subdivision is also consistent with the purposes set forth in Section 20-2 FWCC, the design criteria and development standards of the FWCC, other applicable ordinances and regulations and the requirements of Chapter 58 . 17 RCW. IV. CONCLUSIONS From the foregoing findings the Hearing Examiner makes the following conclusions: 1. The Hearing Examiner has jurisdiction to consider and decide the issues presented by this request. 2 . The proposed preliminary plat of Westhill satisfies the Process III decisional criteria set forth in Section 22-490 (b) FWCC as well as the criteria set forth for subdivision review in Section 20-2 FWCC. The site likewise meets the design criteria and development standards set forth in Sections 20- 151 through 20-157 and 20-178 through 20-178 FWCC, as well as other applicable ordinances and regulations of the City. 3 . The proposed preliminary plat makes adequate provisions for the public health, safety and general welfare, for open spaces, drainage ways, streets, alleys, other public ways, water supply, sanitary waste, fire protection, parks, t playgrounds, and schools. The proposedplat will serve the public use and interest by providing an attractive location for a single family residential subdivision in close proximity to recreational opportunities in a growing area of the City. Therefore, the proposed preliminary plat of Westhill should be approved subject to the mitigating measures set forth in the MDNS. RECOMMENDATION: It is hereby recommended to the City Council of the City of Federal Way that the proposed preliminary plat of Westhill be approved subject to the mitigating measures set forth in the Mitigated Determination of Nonsignificancer. DATED THIS , y DAY OF March, 1994. l STL E'EN . CAUSSEAUX, l Hearing Examiner VI . RIGHTS TO RECONSIDERATION AND CHALLENGE Any person who has a right to challenge a recommendation under the Federal Way Zoning Code may request the Hearing Examiner to reconsider any aspect of his or her recommendation by delivering a written request for reconsideration to the Planning Department within seven (7 ) calendar days after the date of issuance of the Hearing Examiner's recommendation. The person requesting the reconsideration shall specify in the request what aspect of the recommendation he or she wishes to have reconsidered and the reason for the request. The distribution of the request and the response to the request shall be governed pursuant to the provisions of the Federal Way Zoning Code. Within ten ( 10) working days after receiving a request for reconsideration, the Hearing Examiner shall notify the persons who have a right to appeal under the Federal Way Zoning Code, whether or not the recommendation will be reconsidered. The Hearing Examiner may reconsider the recommendation only if he or she concludes that there is substantial merit in the request. The process of the reconsideration will be followed in accordance with the Federal Way Zoning Code. The recommendation of the Hearing Examiner may be challenged by any person who is to receive a copy of that • recommendation pursuant to FWZC 155 .60.6. That challenge, in the form of a letter of challenge, must be delivered to the Planning Department within fourteen ( 14 ) calendar days after the issuance of the Hearing Examiner's recommendation or, if a request for reconsideration is filed, then within fourteen ( 14 ) calendar days of either the decision of the Hearing Examiner denying the request for reconsideration or the reconsidered recommendation. The letter of challenge must contain a clear reference to the matter being challenged and a statement of the specific factual findings and conclusions of the Hearing Examiner disputed by the person filing the challenge. The person filing the challenge shall include, with the letter of appeal, the fee established by the City. The challenge will not be accepted unless it is accompanied by the required fee. The recommendation of the Hearing Examiner may be challenged whether or not there was a request to reconsider the Hearing Examiner's recommendation. CITY OF FEDERAL WAY MEMORANDUM DATE: March 15, 1994 TO: Land Use / Transportation Committee FROM: Gregory D. Moore, AICP - Director of Community Development Services 7 114( Contact: Mike Thomas, Associate Planners) RE: Preliminary Plat of Westhill Federal Way File No. SUB93-0002 Related File No.'s UPR93-0014, SEP93-0019 SUMMARY OF APPLICATION The applicant is requesting preliminary plat approval to divide 1.94 acres into seven (7) single family residential lots as provided for under Chapter 20, Subdivisions, Federal Way City Code and Chapter 58.17 Revised Code of Washington. City of Federal City Code sets forth subdivision review process as Process III review. Under Process III review the hearing examiner conducts a public hearing on the matter, and after consideration of testimony and facts presented makes a recommendation to the City Council. The City Council possess final authority to grant or deny the plat request. II. REASON FOR COUNCIL ACTION Bringing this matter before the City Council Land Use Committee / Transportation for review and recommendation prior to the full Council is consistent with how land use matters are currently processed by the City. III. HEARING EXAMINER'S RECOMMENDATION It is hereby recommended to the City Council of the City of Federal Way that the request for Process III approval for the preliminary plat of Westhill be approved subject to the mitigating measures set forth in the Mitigated Determination of Nonsignificance (MDNS). MDNS conditions can be found on page 4 of the Staff Report. Pages 2 through 5 of the Hearing Examiner's Recommendation contain findings and conclusions that serve as a basis for the recommendation. 1 • IV. PROCEDURAL SUMMARY October 13, 1993 Application submitted for Process III and Preliminary Plat Approval. December 13, 1994 Mitigated Determination of Non significance issued for the project. February 1, 1994 Hearing Examiner hearing held. March 1, 1994 Hearing Examiner determination issued recommending project approval as proposed. March 7, 1994 Land Use Committee meeting. Committee deferred decision until March 21, 1994 meeting. March 21, 1994 Land Use Committee meeting. April 5, 1994 City Council meeting. Pursuant to Section 490 of the Federal Way City Code, the City Council shall consider the application at a scheduled meeting. V. DECISIONAL CRITERIA City Council's review of the application is limited to the record of the hearing before the Hearing Examiner, the Examiner's written report, compliance with review criteria set forth in Section 22-490(d) of the Federal Way City Code and other applicable ordinances and regulations of the Federal Way Code. Section 22-490(d) requires that the application be approved if it is consistent with: 1. The Comprehensive Plan, 2. All applicable provisions of the Code, including those adopted by reference from the Comprehensive Plan; and, 3. Public health, safety and welfare. Finding #14 of the Hearing Examiner's recommendation describes how the application is consistent with these criteria. VI. COUNCIL ACTION After consideration of the record, the City Council may by action approved by a majority of the total membership, take one of the following actions: 2 1. - Approve the Application;-or, 2. Approve the Application with minor modifications; or, 3. Deny the Application; or 4. Remand the matter back to the Hearing Examiner for further consideration; or, 5. Schedule a public hearing before the City Council, in order to consider non-minor modifications to the application. The City Council shall not substantially modify the recommendation of the Hearing Examiner without first referring the matter back to the Hearing Examiner or conducting its own public hearing on the application. 3 CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT REPORT TO THE FEDERAL WAY HEARING EXAMINER WESTHIILL PRELIMINARY PLAT File Nos.SUB-93-0002/ UPR-93-0014/ SEP93-0019 PUBLIC HEARING - FEBRUARY 1, 1994 2 :00 PM CITY HALL COUNCIL CHAMBERS FEDERAL WAY CITY HALL - 33530 1ST WAY SOUTH (206) 661-4118 Report Prepared by: Michael Thomas, Associate Planner NOTE: ALL REFERENCED LETTERS AND OR DOCUMENTS MAY NOT BE ATTACHED TO THIS DECISION. COPIES OF EXHIBITS, REPORTS, ATTACHMENTS OR OTHER DOCUMENTS NOT ATTACHED MAY BE REVIEWED AND/OR OBTAINED BY CONTACTING THE DEPARTMENT OF COMMUNITY DEVELOPMENT, 33530 1ST WAY SOUTH, FEDERAL WAY, WASHINGTON 98003 , PHONE: (206) 661-4118 TABLE OF CONTENTS SECTION PAGE I.SUMMARY OF PROPOSED ACTION 3 II.GENERAL INFORMATION 3 III. THRESHOLD DETERMINATION OF ENVIRONMENTAL SIGNIFICANCE 4 IV. AGENCIES CONTACTED BY FEDERAL WAY 4 V. NATURAL ENVIRONMENT 5 1. Hydrology 2 . Soils 3 . Topography 4. Vegetation 5. Wildlife 6. Sensitive Areas VI. NEIGHBORHOOD CHARACTERISTICS 6 VII. GENERAL DESIGN 6 VIII.TRANSPORTATION 7 IX. PUBLIC SERVICES 7 X. COMPREHENSIVE PLAN 8 XI. DECISIONAL CRITERIA 9 XII. STATUTES/CODES 10 XIII. FINDINGS/CONCLUSIONS 10 XIV. RECOMMENDATION 11 2 EXHIBITS Exhibit A: Plat drawing Exhibit B: Vicinity and Zoning Maps Exhibit C: Legal Description Exhibit D: SEPA Determination Exhibit E: Comments received Exhibit F: Level 2 Downstream Analysis I. SUMMARY OF PROPOSED ACTION The applicant is requesting preliminary plat approval to divide a 1.94 acre parcel into seven (7) single family residential lots (see Exhibit A) as provided for under Chapter 20, Subdivisions Federal Way City Code and chapter 58. 17 Revised Code of Washington (RCW) . City of Federal Way City Code sets forth subdivision review process as Process III review. Under Process III review the hearing examiner conducts a public hearing on the matter, and after consideration of testimony and facts presented makes a recommendation to the City Council who posses final authority to grant or deny the plat request. II. GENERAL INFORMATION Location: The site is located immediately east of S.W. Campus Drive on 7th Way S.W. (refer to Exhibit B) . Developer: Parco Group, Ltd. 4303 N. Ruston Way Tacoma, Washington 98402 Engineer/Surveyor: Pacific Engineering Design, Inc. 130 Andover Park East, Suite 300 Seattle, Washington 98188 Legal Description: Refer to Exhibit C. Size of Property: The overall size of the site is approximately 1.94 acres. Number of Lots: Seven (7) lots are proposed. Proposed Use: Detached single-family residences Sewage Disposal: Federal Way Water and Sewer District Water Supply: Federal Way Water and Sewer District 3 III. MITIGATED DETERMINATION_ OF NONSIGNIFICANCE (MDNS) A mitigated determination of nonsignificance (MDNS) was issued for this proposed action on December 16, 1993 (refer to Exhibit D) . The comment and appeal period for this determination was completed on January 14 1994 . There were no changes to the City's initial determination and no appeals where received. The two MDNS conditions are as follows: 1 . To facilitate periodic maintenance of the stream channel the existing dirt road along the northeast side of the stream will need to be improved to 12 feet in width and be surfaced with grass-pavers or approved surfacing material for the entire length of subject property. 2 . Due to site topography a preliminary grading plan based on 5-foot contours shall be submitted prior to preliminary plat approval . During engineering plan approval the preliminary grading plan shall be refined to 2-foot contours. Actual mass grading of the site based on the final approved grading plan shall be completed prior to recording of the subject plat. Through the environmental review process, comments were received from the Department of Ecology regarding the proposed action and the City's environmental decision (refer to Exhibit E) . In accordance with SEPA Rules, City staff considered each of these comments. Based on our review, staff determined that the City's initial environmental decision adequately addressed the proposed development. There were no changes or corrections to the City's initial decision. IV. CONSULTED DEPARTMENTS AND AGENCIES The following departments, agencies and individuals were advised of this application: 1. Community Development Review Committee consisting of the Federal Way Fire District, Federal Way Water and Sewer District, Federal Way School District, and the City's community development department, public works, parks and police. Staff comments have been incorporated into this report where applicable. 2 . All property owners and occupants within 300 feet of the site were mailed notice of this application and of the February 1, 1994 public hearing. As required by section 20-109 Federal Way City Code (FWCC) notice was sent to 4 -all motility companies- serving-the proposed- development. In addition, the site was posted and notice placed in the newspaper. No public comments regarding the public hearing have been received as of the date of this report. 3 . In accordance with the State Environmental Policy Act (SEPA) and Title 20, Federal Way Environmental Policy Ordinance (FWEPO) , all property owners within 300 feet of the site, and all affected agencies were notified of the proposed action and the City's environmental decision. In addition, the site was posted and notice placed in the newspaper. V. NATURAL ENVIRONMENT 1. Hydrology: The site naturally drains into the adjacent stream tributary at the western edge of the site. Subject stream is tributary to Panther Lake which is part of the Hylebos Creek drainage system. 2 . Soils: The 1973 USDA Soil Conservation Service's (SCS) soil survey for the King County Area classifies the soils as Alderwood and Everett Gravelly Sandy Loam 6 to 15% slopes. The Alderwood Series is the most common soil series found in the county and is made up of moderately well drained soils. Erosion is classified as slight to moderate. Soil is characterized as having moderate limitation for single family construction. 3 . Topography: Subject property slopes down from east to west. Slopes reach 40 percent along the eastern boundary. 4 . Vegetation: The site is moderately wooded with a second and third-growth mixture of coniferous and broad-leafed trees native to the Pacific Northwest. In accordance with the FWCC, Landscaping Article , the applicant will be required to retain 25 percent of the significant trees which exist on site. The applicant may either retain or replant in conformance with the 25 percent requirement. 5. Wildlife: Small birds and animals (squirrels, field mice, etc. ) likely inhabit the subject property; however their population and species are limited due to the surrounding land uses. 6. Sensitive Areas: As stated earlier an unnamed tributary flows along the western boundary of the subject plat. Subject tributary is ephemeral and does not support a resident or migratory fish population. Based on these 5 characteristics,- the City qualifies_ subject stream as a "minor stream" under the FWCC. The FWCC requires that a 50 foot buffer measured from top of bank be established. Plat design reflects this requirement. VII. NEIGHBORHOOD CHARACTERISTICS The property is located west of The Ridge development, a single family development and south of Glen Park Apartment complex. To the west across Campus Drive is located the Highlands development and to the south lies the King County Aquatics Center and associated play and ball fields. The parcel of land adjacent to subject property owned by The Ridge is known as Tract 'B. ' This tract has been set aside as permanent open area for landowners in The Ridge Division 5. VIII. GENERAL DESIGN 1. Circulation: Full width roadway improvements that meet City standards for vertical curbs, gutters, and sidewalks exist along this section of 7th Way S.W. 2 . Pedestrian System: Pedestrian access to the site will be provided by sidewalks along both sides of 7th Way S.W. No internal circulation is proposed for this development. 3 . Roadway System: Access to all lots within this subdivision will be provided off of 7th Way S.W. . No internal circulation is proposed for this development. 7th Way S.W. has been improved to full street standards. The applicant will not be responsible for any further improvements. 4 . Buffers: In addition to providing necessary open space the applicant is preserving a swath of trees that will act as a buffer between the development and the adjacent BPA power lines to the south. The applicant intends to prepare covenants that will restrict tree cutting within the area designated as "tree retention area" on the face of the plat. Language regarding permissible activities within the "tree retention area" will be noted on the face of the plat. Pursuant to the Landscaping Article a 20 foot Type III buffer will need to be installed between the proposed residences and 7th Way S.W. Given the required 20 foot front yard setback and landscaping typically associated with residential development, this requirement should easily be met. 5. Storm Water Run-off Storm water runoff from the site both pre- and post-development runs from east to west and ends 6 up in a minor stream that runs along the plats western property line. As previously noted the minor stream is an unnamed tributary to Panther Lake. A Level 2 Downstream Analysis and a narrative addressing the Core and Special requirements of the King County Surface Water Design Manual (KCSWDM) was submitted to the Department of Community Development (refer to Exhibit F) . The Level 2 Analysis suggested that the stream be cleared of debris and trash in order to facilitate an even and uninterrupted flow of storm water. This suggestion was incorporated into the SEPA determination as a condition of the determination of nonsignificance issued. The applicant, at their discretion may choose to use the Panther Lake Storm Drainage Facility for storm water detention and infiltration. If this course of action is chosen, the applicant will be required to pay a pro-rata share contribution for the capital costs of the Panther Lake facility. The pro-rata share contributions as documented in the Panther Lake Study amounts to $1800/acre. The total amount payable prior to recording of the plat would be $3,942 .00 dollars. IX. TRANSPORTATION 1. Traffic Study/Mitigation Based on the size of the proposed plat a traffic study was not required of the applicant. Traffic generated from the site will not exceed the City's "10 trip threshold" rule. This plat can be expected to generate only 7 . 07 pm peak hour trips and 67 average daily trips. 2 . Public Transit: Access to public transit is provided along S.W. Campus Drive within a 1/4 mile from the site. X. PUBLIC SERVICES 1. Schools: The proposed subdivision will be served by Panther Lake Elementary School, Illahee Junior High, and Federal Way Senior High School. In January 1992 a Capital Facilities Plan was adopted by the Federal Way School District Board of Education in accordance with the State Growth Management Act. The School District calculated that 5 additional students will be added to the school district as a result of the development of the proposed 7 lot plat. The "Plan" makes provisions for the collection of impact fees, construction bonds, and along with acquiring state matching funds to finance new projects to keep pace with 7 new housing. However, impact mitigation fees cannot be collected from this project since the City of Federal Way has not adopted a school impact mitigation plan. Therefore in the absence of such authority no impact fees can be collected. 2 . Open Space: All residential subdivisions are required to provide open space in the amount of 15% of the gross land area of the subdivision site. The proposed plat meets this requirement. In addition to the required open space the applicant is additionally reserving a 60 foot wide "tree retention area" to buffer future residences from the Bonneville . Power lines that run parallel to the plat's south boundary line. Language restricting actions within the "tree retention area" will be noted on the face of the plat. 3 . Fire Protection: Water is available to the site in sufficient quantity to satisfy fire flow standards for the proposed development. The Fire District has approved the location of hydrants as submitted. 4 . Sewage Disposal: The applicant proposes to serve the subject subdivision by a public sewer system managed by the Federal Way Water and Sewer District. Sewer service is available by side sewer connection to the main sewer line in 7th Way S.W. 5. Water Supply: Water is available to the site and adequate to serve the proposed lots. XI . COMPREHENSIVE PLAN The application submitted is governed by the 1990 Federal Way Comprehensive Plan which designates this area as High Density Residential. For the High Density Residential zone the comprehensive plan states that: "These uses should be located in close proximity to major thoroughfares and transit systems, and should have direct connections to recreation and employment areas. Adequate services must be available, particularly transit, and traffic from these districts should not be directed through lower density residential areas. " Though the proposed use is not a multiple family type development as would be typically found under this comprehensive plan designation, it is still in keeping with the policy statement above. 8 The following applicable comprehensive plan policies are applicable to subdivision development and have been met through the design of the proposed plat: Policy H-4: Allow residential development only when supported concurrently by adequate services including roads, utilities, transit, parks, recreation, schools, fire and police. Policy H-10: Use zoning and other types of regulatory techniques to assure a mix of housing sizes and values, and to maintain choice of housing and affordability for abroad range of income groups. Policy H-19: Coordinate the development of housing with transportation improvements. Policy H-28: Assure that all residential subdivisions including those of less than 5 acres and multiple family developments have open space appropriate to their population density. Policy H-30: Prepare maintenance standards to protect storm water systems, prevent erosion and protect natural vegetation. Policy H-34: Protect natural vegetation and limit clearing and grading in residential developments. Policy OS-4: Require both passive and active open space in residential, commercial and industrial developments as an amenity for the site users. Policy OS-6: Coordinate and connect open space with the local and regional trail systems whenever possible (future connection with a BPA trail corridor may be possible) . Policy OS-10: Encourage voluntary dedication or other set- aside of open space based on adopted guidelines for use and maintenance. Policy NE-5: Develop open space or landscaped buffer zones to protect sensitive areas, wetlands, stream corridors, habitat areas, lakes, and aquifer recharge areas. Policy NE-6: Enforce measures to be taken during construction to prevent erosion. XII. ANALYSIS OF DECISIONAL CRITERIA The Federal Way Zoning Code sets forth two sets of decisional criteria for considering preliminary plat approval. One set of criteria is applicable to preliminary plat design, and the other, is applicable to Process III review criteria. The 9 discussion below outlines how both pertinent sets of criteria are met for the subject application. Process III Decisional Criteria: Pursuant to section 22-490 (d) of the Federal Way Zoning Code, the Hearing Examiner may recommend approval of the proposed rezone and preliminary plat only if the following decisional criteria are met. 1. The protect is consistent with the Comprehensive Plan. Staff Comment: The site is currently zoned RM 2400. Single family residential uses are an allowed use in this zone. See above comprehensive plan discussion under section XI. 2 . The project is consistent with all applicable provisions of the Federal Way Zoning Code. Staff Comment: Development of this site is required to comply with the provisions of the Federal Way Zoning Code, Environmental Policy Code, Methods to Mitigate Development Impacts Code, Federal Way Subdivision Code, and all other applicable development codes and regulations. As proposed and recommended by City Staff, the preliminary plat will comply with all applicable codes and regulations. 3 . The project is consistent with the public health, safety, and welfare. Staff Comment: The proposed preliminary plat is consistent with the City of Federal Way Comprehensive Plan, zoning code, and other applicable development codes and regulations. Existing streets and utilities in this area are adequate to serve the proposed development. Approval of the proposed preliminary plat would permit development of the site consistent with the current High Density Residential land use classification of the City's Comprehensive Plan. Development of the site in accordance with applicable development codes and regulations will ensure that public health, safety and welfare is protected. Preliminary Plat Approval Decisional Criteria: Pursuant to Chapter 20 of the Federal Way City Code (FWCC) , the Hearing Examiner shall review the preliminary 10 plat for compliance with section 20-2, Purpose, and design criteria and development standards of the FWCC, other applicable ordinances and regulations of the City, and requirements of chapter 58. 17 RCW: Staff Comment: Development of this site is required to comply with the provisions of the Federal Way Subdivision Code, Environmental Policy Code, Methods to Mitigate Development Impacts Code, Federal Way Zoning Code, and all other applicable local and state development codes and regulations. The City's Development Review Committee has reviewed this proposal in relation to these development codes and regulations. As proposed and recommended by the City, the preliminary plat with all applicable codes and regulations. XIII. STATUTES/CODES If approved the recommended conditions in this report, the proposed development will comply with the requirements of the Federal Way Comprehensive Plan and RCW 58. 17, the Subdivision and Platting Act. Lots within the development will also comply with the minimum size requirement for detached dwelling units in the RM 2400 zone. XIV. FINDINGS OF FACT AND CONCLUSIONS Based upon an analysis of the proposed action, the environmental record and related decisional criteria, the Department of Community Development finds that: 1. The proposed plat will create seven (7) single family residential lots. 2 . Subject property lies within a RM 2400 zoning district which allows for single family dwellings based on a minimum lot size of 5, 000 square feet. The project is designed for lots of 7,200 square feet. 3 . A mitigated determination of nonsignificance was issued for this project on December 16, 1993 . The appeal and comment period ended on January 14 , 1994 . 4 . A tributary to Panther Lake runs along the plats western boundary line. The tributary meets the definition of a minor stream and will be afforded the protection of a 50 foot setback (buffer) from development as required by FWCC. 5. Pedestrian and vehicular access is provided to the site by 7th Way S.W. This residential street currently meets 11 city standards. 6. The applicant is providing the required 15 percent open space on site. 7 . The applicant, at their discretion has the choice of providing on-site storm water detention or using Panther Lake, a regional storm water facility for this purpose. If Panther Lake option is chosen the applicant will be required to pay a pro-rata share contribution toward the improvements to Panther Lake based on a rate of $1800 per acre. 8. 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''1 3600 RS 9.6 1111 uolg111li.i.n ////. , . 60 •1/411p RS RM 2400A RS a MillVzarx4.1 \ 5.0 f 3600 Wks amp ti,1 1211W; . i'l ' a 2 0\ 3C ,.�.i 1 : ' : NIA � ake 111111 � 2400 SW 340P CONCOMITANT RM . /e`� REEMENT3 600, i,' - - 3 .t 342 ST 1 ��/ice A. 101 SW ' •TH ST • 344 ST ,� ,, , • LEGAL- DESCRIPTION THE LAND REFERRED TO IN THIS COMMITMENT IS SITUATED IN THE STATE OF WASHINGTON, COUNTY OF KING AND IS DESCRIBED AS FOLLOWS: • THAT PORTION OF THE NORTHWEST ONE QUARTER OF THE NORTHEAST ONE QUARTER OF SECTION 19, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON, SAID PORTION BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: COMMENCING AT THE NORTHWEST CORNER OF SAID SUBDIVISION; THENCE ALONG THE WEST LINE THEREOF SOUTH 01°11'40"WEST 1078.13 FEET; THENCE LEAVING SAID WEST LINE NORTH 52°58'44"EAST 78.28 FEET TO THE MOST NORTHERLY CORNER OF THE LANDS DESCRIBED IN DEED RECORDED UNDER RECORDING NO. 7412180379, RECORDS OPSAID l^,OUNTY AND THE TRUE POINT OF BEGINNING; THENCE NORTH.37°01'16"WEST 2.00 FEET; THENCE NORTH 52°58'44"EAST 112.82 FEET TO THE BEGINNING OF A CURVE CONCAVE TO THE SOUTHEAST HAVING A RADIUS OF 372.00 FEET; THENCE NORTHEASTERLY AND EASTERLY 194.78 FEET ALONG SAID CURVE THOROUGH A CENTRAL ANGLE OF 30°00'00"; THENCE NORTH 82°58'44"EAST 70.64 FEET; THENCE SOUTH 37°01'16"EAST 169.44 FEET TO THE NORTHWESTERLY LINE OF THE TRANSMISSION LINE RIGHT-OF-WAY CONVEYED TO U.S.A. BONNEVILLE POWER ADMINISTRATION BY INSTRUMENT RECORDED UNDER RECORDING NO. 3194572, RECORDS OF SAID COUNTY; THENCE ALONG SAID NORTI-IWESTERLY LINE SOUTH 52°58'44"WEST 360.00 FEET TO THE MOST EASTERLY CORNER OF THE LANDS DESCRIBED IN SAID DEED; THENCE ALONG . THE NORTHEASTERLY LINE THEREOF NORTH 37°01'16"WEST 252.60 FEET TO THE TRUE POINT OF BEGINNING. SITUATE IN THE COUNTY OF KING, STATE OF WASHINGTON. EXHIBIT PAGE OF CITY OF FEDERAL WAY DEPARTMENT OF COMMUNITY DEVELOPMENT 33530 1st Way South Federal Way, Washington 98003 (206) 661-4118 MITIGATED ENVIRONMENTAL DETERMINATION OF NONSIGNIFICANCE Federal Way File Nos. SUB93-0002,SEP93-0019 Description of Proposal: The project proponent is proposing to subdivide a 1.94 acre parcel into 7 single family residential lots. Location: The property is generally located near the K.C. Aquatics Center on 7th Way S.W., just east of S.W. Campus Drive. (see attached vicinity map). Lead Agency: City of Federal Way, Department of Community Development Staff Contact Person: Michael Thomas, Associate Planner, (206) 661-4104 The responsible official of the City of Federal Way hereby make the following Findings of Fact based upon impacts identified in the environmental checklist and the "Final Staff Evaluation" for the environmental checklist, Application Nos. SUB93-0002 and SEP93-0019; Conclusions of Law based upon the Federal Way Comprehensive Plan and other municipal policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the Washington State Environmental Policy Act Rules pursuant to RCW 43.21C.060. Findings of Fact: 1. The 'Final Staff Evaluation for Environmental Checklist Application No. SEP93-0019 is hereby incorporated by reference as though setforth in full. 2. The proposed action is to create seven (7) single family residential lots. 3. The project will utilize the Panther Lake Regional Storm Water Facility for detention and infiltration purposes. EXHIBIT PAGE I OF 3 4. The applicant submitted a Level 2 Downstream Analysis dated November 10, 1993 prepared by DOWL Engineers. The report concludes that the adjacent stream has the j_. capacity to accommodate and convey any runoff from the proposed plat to Panther Lake. 5. The proposed subdivision will generate 7.07 p.m. peak hour trips, which is less than the "10 trip" threshold requiring that a traffic impact analysis be prepared. 6. A minor stream as defined by the Federal Way City Code flows along the property's west property line. Conclusion of Law: 1. Allow for residential development only when supported concurrently by adequate services including roads, utilities, transit, parks, recreation, schools, fire, and police (policy H-4, FWCP). 2. Enforce measures to be taken during construction to prevent erosion (policy NE-6, FWCP). 3. Assure for all people of Washington safe, healthful, productive, and aesthetically and culturally pleasing surrounding (policy 10.230.20(2) Federal Way Environmental Policy Ordinance. 4. Require environmental impact assessment and mitigation of potential impacts to sensitve areas before development is permitted (policy NE-9, FWCP). 5. Retain existing wetlands and drainage channels to recharge aquifers and contain storm water run-off (policy NE-14, FWCP). 6. Prepare maintenance standards to protect storm water systems, prevent erosion and protect natural vegetation (policy H-30, FWCP). 7. Give high priority to solving residential environmental problems relating to health and safety (policy H-26, FWCP). The lead agency for this proposal has determined that the proposed action does not have a probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c), only if the following conditions are met. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available upon request. Conditions: 1. In order to facilitate periodic maintenance of the stream channel the existing dirt road along the northeast side of the stream channel will need to be improved to 12 feet wide and surfaced with grass-pavers or other approved surfacing material for the entire length of subject property. EXHIBIT I) 2 PAGE 1- OF 3 2. Due to site topography a preliminary mass grading plan based on 5-foot contours shall be submitted prior to preliminary plat approval. During engineering plan approval the preliminary grading plan shall be refined to 2-foot contours. Actual mass grading of the site based on the final approved grading plan shall be completed prior to recording of the subject plat. This MDNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal for 15 days from the date of issuance. Comments must be submitted by December 31, 1993. Unless modified by the City, this determination will become final following the above comment • deadline. Any person aggrieved of the City's determination may file an appeal with the City within 14 days of the above deadline. Staff Contact Person: Michael Thomas, Associate Planner, (206) 661-4104 Responsible Official: Kenneth E. Nyberg Position/Title: Assistant City Manager Address: 33530 First Way South, Federal Way, Washington 98003 Date Issued: /� 3 Signature: 3 EXHIU'T P PAGE, 3 OF 3 r ( r '• ,sTnrt• \ ' �t li�j' i" .1 � ';.oY� ME7101./Z7YtAe®a COMMUNfTY OEPAAT1 ENT STATE OF WASHINGTON DEPARTMENT OF ECOLOGY JAN 0 3 1994 P.O. BOX 47600 • Olympia, Washington 98504-7600.-• (206) 459-6000 December 29, 1993 i� 4 .. i Mr. Kenneth E. Nyberg City of Federal Way 33530 First Way S Federal Way WA 98003 Dear Mr. Nyberg: Thank you for the opportunity to comment on the determination of nonsignificance for the West Hill subdivision proposed by Parco Homes, Ltd. We reviewed the environmental checklist and have the following comments. Dry weather clearing and grading would simplify erosion control and minimize the potential of adverse effects on Panther Lake or its tributaries. If you have any questions, please call Mr. Ron Devitt with our Water Quality Program at (206) 649-7028. Sincerely, lAte/C/76t Rebecca J. Inman Environmental Review Section RI: 93-8961 cc: Ron Devitt, NWRO Janet Thompson, NWRO EXHIBIT PAGE OF '___ LEVEL 2 L pwirsi r-Ft Edch.11-1 ANALYS I for WEST HILL PLAT, FEDERAL WAY Prepared for : Mr . Paul Krakow Parco Group , Ltd . 4304 North Ruston Way Tacoma, Washington 98402 Prepared by : Pacific Engineering Design , Inc . 130 Andover Park East, Suite 300 Seattle, Washington 98188 September 28 , 1993 25I ,. EXPIRES 8/4/9 A EXHIBIT PAGE 1 OF 2 b Level 2 Downstream Analysis ( 1 ) West Hill Plat Introduction: The proposed Preliminary Plat of "West Hill " was introduced to the City of Federal Way ' s Development Review Committee at a preapplication conference on June 3 , 1993 . On June 22 , 1993 the DRC issued a comment letter identifying preliminary development standards that would be imposed on the project . In the letter , it was indicated that , as an alternative to providing on-site stormwater detention , the project could pay an $1800/acre impact fee and utilize the Panther Lake Regional Detention Facility . This option could be selected provided a Level 2 downstream analysis determined that the downstream system had capacity to convey the additional runoff resulting from direct discharge . Prior Studies : The project site lies near the lower end of the Panther Lake West Tributary conveyance system. This system was previously studied by Brown and Caldwell with results presented in their December 1992 "Level 2 Hydraulic Analysis" report to Erickson McGovern Architects . The study was requested by the City of Federal Way to assess impacts of the development of Junior High School #6 on the West Tributary system and on Panther Lake regional detention facility . (Portions of the report are included herein for reference . ) Brown and Caldwell performed a comprehensive field survey of the West Tributary system. Their study broke the system into several reaches each of which were analyzed for conveyance performance during various storm events under existing and future land uses . Two of these reaches , designated RCHRES11 and RCHRES12 , are immediately downstream of the project site . RCHRES11 is an open drainage swale that crosses the westerly end of the site carrying flows south . RCHRES12 is part swale and part culvert and carries runoff the balance of the way to Panther Lake . Brown and Caldwell ' s report presented the following conclusions : Reach Ultimate Est ' d Peak Runoff from Capacity Developed (Future) Basin RCHRES11 330 CFS 260 CFS ( 100 yr - 24 hr storm) RCHRES12 >500 CFS 260 CFS ( 100 yr - 24 hr storm) EXHIBIT F- PAGE 2 OF up { Level 2 Downstream Analysis (2) West Hill Plat Analysis : The drainage basin considered in Brown and Caldwell ' s Level 2 Analysis includes flow contributions from the developed project site. Their conclusions clearly indicate that the project ' s downstream system has excess capacity to convey all basin storm runoff up to and exceeding a 100 year event . The additional information provided by this report includes : (a) a narrative description of the downstream system (reaches RCHRES11 and RCHRES12) , and (b) calculation of the developed project ' s peak runoff rates for three major storm events. (a) Onsite Basin and Downstream System Description : The project site is approximately 1 . 94 acres in size. It is roughly rectangular in shape and is bounded on the north by 7th Way South . To the west is a parcel owned by Federal Way Water and Sewer District which is the site of a well and pump station. To the east is undeveloped land which is part of an open space tract for the Plat of The Ridge . The south is bounded by a 200 foot wide B . P . A . transmission line easement . The preponderance of the site slopes east to west at approximately 10 percent . The easterly two-thirds of the site is heavily wooded with predominantly evergreen species , and there is a relatively thick understory of brush and grasses . The westerly third is remarked by several storm drain outfalls extending from 7th Way and daylighting into a broad south-trending swale . The culverts discharge drainage from the West Tributary upstream basin . The preponderance of the site also drains directly to this swale . The following is a narrative description of the field inspection of RCHRES11 and RCHRES12 made June 21 , 1993 by Richard Tomkins P . E . : Drainage enters the site via three 48" concrete culverts crossing under 7th Way . Two 30" CMP culverts also release upstream drainage onto the site at this location . The pipes daylight into a broad south-trending swale . This swale corresponds to Brown and Caldwell ' s study reach RCHRES11 . The swale cross-section is very large but is not uniform. Width varies from 40 to 90 feet , depth varies from 6 to 10 feet . The first 15 feet of this swale is armored with rip rap . Thereafter , the swale has a flat muddy bottom of varying width ( 3 ' to 15 ' ) with grassed sides . Water appears to pond at a depth of 1 ' , with sluggish flow confirming minimal gradient . A dirt road parallels the north side of the water course extending from 7th Way to near the south property line. The watercourse narrows to a 3 foot wide stream where it exits the site approximately 50 ' east of the south EXHIBIT corner . PAGE 3 OF Zo C Level 2 Downstream Analysis (3) West Hill Plat Flow thence continues southerly along the bottom of the broad swale becoming a meandering stream as it crosses the B . P . A. right-of-way . The swale bottom at this point changes from mud to stone with scattered grass and weeds . Flow here is less sluggish due to a slightly steeper gradient and has a depth of 4 to 6 inches . The stream banks are thick with stands of small alder- like saplings and the swale sides are heavily grassed . The swale cross-section appears to be more uniform here and remains quite large - 30 to 40 feet wide and approximately 10 feet deep . Quantities of debris (cut brush and construction materials) was observed near the east edge of the B . P . A . right of way . This tends to obstruct the current low flows , but the overall swale cross-section is so great that ample capacity is available for larger flows . Flow exits the B . P . A . right-of-way and continues southerly along the bottom of the same broad swale until entering a 75" x 112 ' arch CMP located near the west end and behind the County Aquatics Center . Here the swale has been filled to provide a flat yard area. The upstream end of the arch CMP corresponds with the beginning of Brown and Caldwell ' s study reach RCHRES12 . (RCHRES12 extends south to Panther Lake) . Approximately 100 feet upstream of the Aquatics Center , the streambed widens to about 6 ' and flow meanders through a rock lining made up of 6" to 8" quarry spalls . The arch CMP is approximately 220 ' long and daylights midway along the Center ' s frontage , discharging flow again to a rock-lined streambed at the bottom of the reopened swale . Here the rock lining is comprised of larger rip rap up to 18" in diameter and current drainage flow was barely visible as it meandered under the rock . Flow continues southerly towards Panther Lake as the gradient from arch CMP to the lake steepens to about 3 percent . Approximately 150 ' northeast of the Aquatics Center , the swale opens and flow is released to the lake over a broad rocklined apron . As anticipated from reading the Brown and Caldwell report , the June 21st downstream inspection confirmed that the entire drainage course has an extremely large cross-section with correspondingly large conveyance capacity . No evidence of stability problems or significant erosion was observed . Water quality was poor at the culvert outfall from 7th Way , but improved as flow left the site and proceeded downstream. The improvement apparently due to the biofiltering action of intermittent patches of grassy vegetation along portions of the stream course upstream of RCHRES12 . EXHIBIT F PAGE `( OF ' Level 2 Downstream Analysis (4) West Hill Plat No basis was observed for assuming any significant adverse impact would result from allowing project runoff to enter the system unrestricted . (b) Developed Project ' s Peak Runoff Rates : The project ' s contribution to runoff entering the downstream system was calculated using the "Waterworks" hydrology software program. This program employs Santa Barbara Urban Hydrograph Methodology to model the contributing basin and derive peak runoff rates . The following is a recap of the results of the "Waterworks" analysis performed to estimate unrestricted runoff rates for the developed site : Design Storm Peak Runoff (CFS) 25 year 24 hour 1 . 08 100 year 24 hour 1 . 41 100 year 7 day 0 . 54 (Supporting calculations and "Waterworks" basin summary reports are attached . ) CONCLUSIONS: 1 . At 1 . 41 CFS , the developed site ' s unrestricted peak 100 year storm runoff amounts to only 0 . 5% of the total flow estimated for the West Tributary basin under developed (future) conditions . 2 . Brown and Caldwell ' s report concludes that the portion of the West Tributary system that is downstream of the project has considerable excess capacity under developed (future) conditions . 3 . Field inspection confirmed that the system has a very large cross-section along its entire reach to Panther Lake . Conveyance capacity results derived by Brown and Caldwell appear entirely reasonable . Accordingly , free discharge (discharge without on-site detention) as is proposed for this project , should not result in any adverse impacts to the downstream system. It is recommended that ongoing maintenance of the system (removal of trash and debris , thinning of woody vegetation , etc . ) occur on a regular basis to ensure continued good conveyance performance and wateEXHIBIT PAGE 5 OF The following pages present Excerpts from Brown and Caldwell ' s December , 1992 Level 2 Downstream Analysis and hydraulic analyisis calculations for the project site . EXHIBIT F PAGE 1 OF S312th ( / -1 /, 1 Panther Lake 1 t2 J0 ti, n S 324th (� / _, ,,, ....._ .4 ...._._/ / // SW 336th I 1/ 3 I Q S 336th J • µ/H16 �i J West Branch C ,1 allf Hylebos Creek 1 Federal Way \, wxzs • 1 ci �.� .. tii;flitit5W356th .4 �, f . S 360th .1' r \q.t 2 West Hylebos .9• Wetland c sc, x Milton , O 1 N • -- --—--— Key: --N. ---.. Bodies of Water — Basin Boundary • ire_ w;�®.s. —....."- Subcatchment Boundary Scale in Miles WH14 Subcatchment Numbers Figure 1 Panther Lake Drainage BasinE �' PAGE .6C.. Iq , ,. t:63,3a .4, x WI • W OJ Se� Q a i • \ /yam t + • i + \ ctFCC. / 4- ♦ + i + •+ + 4.0 .� • 4 + + + + + • } } + +a+ • + • + a + 4a 4 + + .+ + + 4 4 + 4 4- +•. W 4. • + \\:: tL '�J:' i + + + • + + h ♦ + ♦ • 4 ♦ 4 4 • , 4 , 4 i ✓+ +a+ +L} • + } + + ♦ + + + + + + 4. i • r r 4. + 4 + • • • • • + • a ♦ 4 • + + + /4 ♦U+ r + 4 1 CSt 4. 4J r laI• • + • 4 4 + + 4 + 4- ♦ + 4. 1 dtth Zoe V2� a \ + 4 • r + + , ‘-e... -c-:\ \ (I) ' .33,\ir• • 1,:5\,,, LLI • 4 4 4 4. 4- I i p� ud `• 1 ,_ 1 r �n OC ' a� . LL a �O •j • ♦ b 909 I\c N., • ....-.) \\\.\\,\ :\ • 0 l • \ d , ^� CJ Sr"ii,. r V rJ 2 .Z> <Lr / ..' .st .' ' -- : .\ 4.4:c6, CX N • ......., '*- \ I\ ___ , 4\ .... 41IIIVR....',, ,•• .. .... ,... tnn- V/N -r 401 K` 1 1.,.iQ I r , . 1 CC P x -wv \ v ` �\ s 6\c Cr O u �,.+� _ I • o F a;,ad P 1 / r OD yti/ `f • `ems ki1, k•IT�% ti Tr' •� • r� \ ..\ ( 12 Table 6 . Conveyance Elements and Capacities HSPF routing Actual elements Ultimate element capacity, cfs RCHRES1 Conveyance for IH15 (Panther Lake RCHRES1) 650 RCHRES2 19th Ave. tightline MH 10-12 30 RCHRES3 19th Ave. tightline MH 5-10 120 RCHRES4 19th Ave. tightline MH 2-5 120 RCHRES5 19th Ave. tightline MH 1-2 160 RCHRES6 Channel from Sta 42+11 to 40+47 100 RCHRES7 Culvert from Sta 39+30 to 40+47 160 Channel from Sta 24+62 to 39+30 Culvert from Sta 23+00 to 24+62 RCHRES8 Channel from Sta 20+00 to 23+00 >500 RCHRES9 Channel from Sta 20+00.to 18+21 180 Culvert from Sta 17+12 to 18+21 CHRES10 Channel from Sta 17+12 to 11+04 >500 lv rt from Sta 9+47 toll+0 4 7 ^,,,, �-Y Y 0 - RCHRES11 Channel from Sta 2+01 to 9+47 330' RCHRES12 Channel 1 and Culvert 1 (Panther Lake to Sta '2+01) >500 CMOrNIPNIF RCHRES13 th Avenue Corridor 7/wMSITZGA 1# .- lt( The hydrographs for each storm and land use condition were routed with HSPF using these stage-storage-discharge relationships for the thirteen elements. Table 7 lists the HSPF subbasins and the RCHRES receiving their flows, and Tables 8 lists the RCHRES under capacity with each hydrograph condition. Numbers placed in parentheses next to each RCHRES represent the additional capacity required to prevent overflow. The peak flows experienced in each RCHRES under each storm and land use condition are presented in the appendix. ELL r::-- Dcccmhcr _- 64 rcponl.wpw PAGE - OF 2f0 LMA OF PEAK FLOWS EXPERIENCED BY HSPF-R�..2ES 25 Year 24 Hour Storm • Peck flow rate.cfs RCHRES LU1 LU2 LU3 • 1 56 56 95 2 1.3 20 20• 3 56 63 103 4 110 130 160 5 110 130 160 6 150 170 210 7 110 120 170 8 110 130 170 . 9 110 130 170 10 140 160 190 11 140 • 150 190 12 140 150 190 13 0.38 5.2 5.2 • 100 Year 24 Hour Storm Peak flow rate.cfs PCHRES LU 1 LU2 LU3 1 93 - 93 140 2 3.0 . 26 . 26 3 93 100 150 • 4 150 170 • 240 5 150 170 240 6 210 230 310 7 160 170 230 8 160 180 240 �1rA4 00 TW-- Z K2-- ✓ C 9 160 180 230 1 OUO S s� — ` > 10 260 2 190 2200 260 14 Al K % zt!/0 5 1W,4S�1) ofu l.k. 100 Year 7 Day Storm Peck flow rate.cfs RCHRES LU1 LU2 LU3 . 1 94 90 120 2 12 13 13 _ 3 95 100 140 4 150 160 200 5 150 160 200 6 190 11JU 250 7 160 170 220 8 160 170 220 9 160 170 220 10 180 200 240 11 180 200 240 12 180 203 240 • 13 0.39 3.2 3.2 LUI ^ Land Use Condition 1: Entire basin at 1990 land use 11 r{��� condition. 4-1r Z a Land Use Condition 2: School r6 developed and remainder of r basin at 1990 land use. C ��• E /l' !�� - L1.13 _= Land Use Condition 3: School :6 developed and remainder of C ,Q e oasin at future land use. 4Plrit��• A PAG OFF - caaa-.c °.a<-,c.We)•3.°,u ..,.. v.7.u.. 000.,nt•,m / .op«°c Q 0) * (` . Y 8 ( ZZ o mot,�.�,y 'ava.o,c .c Y• r ' 1I I Q •Z -q�F till rauo 03.4 xo4 { n Q os, !a ; , c ak,..,,o VA •03 ONiY .B+'j(171:I,IS2AA tam•• .LVTd•IWNWIT31Id . -� i a W Z t i z �f] EI} i� � � �. ii iW!ill s�f Lill i' ZW 2 � ! l -' Q -�- .: w-tceed:. ; 1 11111111ffill Al ' ,' \ h c \ \\ \\\\ R Z \-\ .. ✓ ,r'• r:r.'‘ a ,I.� •1 7 i -, ,Z4•, • ''; i '.•.- • ..P /�' •l,.•'�� rl, w 1. \\ /V/� P \• �:.,,: ,.. r •t, .io ,': ``•�:' � •/' !-- -, Iot .4 `� VJ i r- �- \.�`• " ^: ••./ v' ''..'•`�• �'t 8122' i. .,./ �V./ / W ;t \,, ,.., , .t..--1-1,----1,-.7 ..,"/ :,?;•,4•,,4.7.- /•• -.-:-f, .!"-' -<.\-------' .. , • . • Z . 1 ,' \\‘'.,- - --- ,r"--- 7,,e,,-'Z.-6.-'vi›:';v-y. 1 ,..._..,. \ 4 i"epk_• :/ ,'' `�1, .it " 1,V / / ram; µ 4•. 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I I z-.*), ,,•/..r -g :r.i 1 ifri is xj,s-7.--- --,,v- : .... , • • .--z . . . • 130 ANDOVER PARK EAST, SUITE 300 SEATTLE, WASHINGTON 98188 (20PAGELOI--tAX:431-0F 2_,. . 9/28/93 Pacific Engineering Company page 1 WEST HILL PLAT, 7TH AVENUE SW, FEDERAL WAY DRAINAGE BASIN PEAK RUNOFF MODELING USING 'WATERWORKS' • HYDROLOGY SOFTWARE --------------------------------------------------------------------- BASIN SUMMARY BASIN ID: 100-7 NAME: DEV.SITE RUNOFF 1O0YR-7DAY ST SBUH METHODOLOGY TOTAL AREA 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE : KC7 PERVIOUS AREA PRECIPITATION : 10.10 inches AREA. . : 1 .33 Acres TIME INTERVAL : 60.00 min CN. . . . : 72.70 TIME OF CONC 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0.61 Acres CN. . . . : 96.30 PEAK RATE: 0.54 cfs VOL: 0 .99 Ac-ft TIME: 3300 min BASIN ID: 1O0D NAME: DEV. SITE RUNOFF 1O0YR STORM SBUH METHODOLOGY TOTAL AREA 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE : USER1 PERVIOUS AREA PRECIPITATION : 4 .15 inches AREA. . : 1 .33 Acres TIME INTERVAL : 10.00 min CN. . . . : 83.60 TIME OF CONC - 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0.61 Acres CN. . . . : 98.00 PEAK RATE: 1 .41 cfs VOL: 0.47 Ac-ft TIME: 480 min BASIN ID: 25DEV NAME: DEV. SITE RUNOFF 25YR STORM SBUH METHODOLOGY TOTAL AREA : 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE : USER1 PERVIOUS AREA PRECIPITATION : 3.42 inches AREA. . 1 .33 Acres TIME INTERVAL : 10 .00 min CN. . . . : 83 .60 TIME OF CONC 10.00 ruin IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0.61 Acres CN. . . . : 98.00 PEAK RATE: 1 .08 cfs VOL: 0 .37 Ac-ft TIME: 480 min BASIN RESULT SUMMARY BASIN VOLUME-- RATE - -TIME . Hydrograph Area IB ---cf-- Ac-ft --cfs- -min- hours Methodology Acres 100-7 43194 0.99 0.54 3300 55.00 SBUH Method 1.94 1000 20603 0.47 1.41 480 8.00 SBUH Method 1.94 250EV 15941 0.31 1.08 480 8.00 SBUH Method 1.94 • t55- EXHIBIT PAGE I. _ OF ci [FLEA() 1h3d Ho. 1 Zri`CQ- -Z4 irkg, -5Totr..4. Szil Hud Ho. 2_ too'.—Z4 tt z. •N-Cottr'l coJNVF tl • . "0 W • O N • W • • Q 3 6 9 12 15 18 21 24 27 Tine in Hours Hyd No.: 1 Rate: 1.08 cfs Time: 8.00 hr Vol : 0.37 Ac-ft Int: 10.00 min Hyd No.: 2 Rate: 1.41 cfs Time: 8.00 hr Vol : 0.47 Ac-ft Int: 10.00 min • O LCASI'il'Iti i+71 Ho. 3 too "fQ- j bPsi 11oVF h r O ' C d YW N O 24 48 72 96 120 144 168 192 Tine in Hours Hyd No.: 3 Rate: 0.54 cfs Time: 55.00 hr Vol : 0.99 Ac-ft Int: 60.00 min EXHIBIT • PAGE j OF Z KING COUNTY,( AS NGTON, SURFACE \ . T DESIGN MANUAL TABLE 3.5.28 SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC ROUP LAND USE DESCRIPTION A B C ` D Cultivated land(1): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 ,` 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed or older second growth 42 64 . 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover crop 81 88 92 94 • Open spaces, lawns, parks, golf courses, cemeteries, landscaping. good condition: grass cover on 75% • or more of the area 68 80 86 90 fair condition: grass cover on 50% to 75% of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roofs, etc. 98 98 = 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 • 100 100 Single Family Residential (2) Dwelling Unit/Gross Acre °A Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 D GA 48 6.0 DU GA 7.0 DU/GA 56 Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and • industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. 3.5.2-3 • EXHIBIT �jtt/92 PAGE 16 OF z4 •.f. KING COUNTY. WA( AIN ' ON, SURFACE WAT\- D __ IGN MANUAL FIGURE 3.5.IF 25-YEAR 24-HOUR ISOPLUVIALS ,Aggli filtr"1-401r4---- - `7-1/ ,j 2 ... • 9 i 1111112A 4111144 1-!isi -Illillitli . 3.0 ./. *kit'Or ' 3.7 i --- • Ilmif I At4 J./ nip ii, ) tio'. . . '' , . 3..e .. iweig.klituh i c i.!..,d lie I . . . • ,.--- irt.- -2-5111m.h.,,,4.4- j-1 , ,_, \ - it 34 i - -/ '--4 4 1 3.8 .,. - - - .,4010,, . ,_„.- ,..... .jeroilkowt ' , II i .' .Alta i .• ill! WrAlablliliAmill& _. , fs ttri I ' .% 'elk ' 1— —111klit.- -PIMTOM R/W-00 1 AA ‘giirnm i ,. wiiis 1 ,W W 4 10a0.70,0 i'''/ - .„ak4 A . A i, 'W t pill, .40 \w"---imomiza•-°•Adi*........evair it Is.. 40110.;....ar, ..... .., ,z...awmor, 1. . .1th w. .m...=,1 r 4,,,( .--)Nar .. ..„2. __-::. ....1wor .2..; 0 i \-..,,v,- - — ) ,.. 1_,,,i eior,...—••.P -•‘11- dipirfirr �' mi... a T - )- ( j tli tl fib ' Alk • /..,. ‘ V' / <04 .\ , CA • 727.- IA Nitk\.,!-% ..--- I g . • 1„, IS.I.% 4iScii.... 4. plc . . ?j1L � , _ III . _1,73"-- : --.� ". ‘1, �J, 'iM ,� f,-- - ,,,--N.-- - 0 -)--- .-Th(F.q S. .:- • • i I :::—. ,._ "::,.. 17;4 . 7 ._;,;:„ ,,,,,,!.,-„, . s,:. .--.._ , 1, 4.„ .... i , _ , :„. ...„. zi iiii,,. ,,,,,r:.774„. .)"-- ..:_-.-. ' ,./ .( . - ,-. ,,,.-..-:,,,i a : t. 1 At 0. ,. \ .: •:,,.,>- ... , ;., .__., :, jr"' p % ‘111, .,. Pi Itti 4, .,.. .. ,),. :- , ,, .,..,----- ,,, .-.2,.. I iii ,-. II_ 1 ii , ik- a _ - ` l'=•--,::: -1 .\. --/-r- *.-16110-114218 "iNi .; .?1‘ .-iipile --)I- tti, ' .--... 4 . (1 i k.11117:.Ilit7iik". .7!.)t.41. • 17:111111r. 11 • .. !:1111r6k1,_111:); ', 1J i! 2• or 5. - --m...-- ------ "-'-' ------- --- • ti AI '5-YEAR 24-HOUR PRECIPITATION op '� SS • 3.4 ISOPLUVIALS OF 25-YEAR 24-HOUR _ . TOTAL PRECIPITATION IN INCHES rb• r_ ,� 41Y o l 2 3 a s a 7 n MUGS . ,—, I , 3.5.1 11 �� "A - ' . F /_9 /E1:300,000 KING COUNTY. W ._ S I-II TON, SURFACE W A •. iR SIGN MANUAL FIGURE 3.5.1H 100-YEAR 24-HOUR ISOPLUVIALS 3Q -- f 4 CIF .__r_- - - - -•- -- - - --- 101/6470? ;: 41110441littp - .' - _Ik‘ 3'4 //;/ INK01411.1 1 ,,„ , iit law . 3-te• : 3 —.4:1118.114-401 41113) - ‘t ...• o %1P1 4.(Y-it 1 *R4611,11110 'pliph 1111,f,pfibill4 !--, 4ottittlwAlititt.*,,444:10. �, ry , 0. . .E 461 't o ,,orAmor Ai ' _.&,.. .4 ._.xit‘sztprollie 1/71.11_,_„„figeol, ii 414 ::.'\• - t-'4- Vtiii_01 - -- '11,0111P "egitp1.11 \sit ,,k, 4 '-I A\ ' to) . ::` i'`ii 814,00,„(r„02,,,--- ‘,.. r-itii.., , _ea%, ;!--I lki 1\' l' 64,0fifiekr40:41W,00003.00-1'.17-% 18 rk - lik 4 4 41,• pP11,1• ,r1,4 4-t k\!...,w..1/4.\ e 411iri1111:1..i.v 46 -i .c. — `- • t�i '� y4T,ft, 4,iii 4 11i•-.*_oa\ /,IAL_ .1.-tg> -\-7-.-- „mlI4,1.,a ,1iN IL 1iit-k.k sf,.I,, 1t1 1i.b1fl%1a Pl,11i,t.„ .t-T,„„4i :,\N4r4i 1_:-: i„,1/4.„, , i , ,___, ,---- _ li'l u.- ri A ik ql'h :7..' ''\\," 4141k\li- -- -"„j.-e. .--.--' i r 4.4\ -0,.., H' , vl .„.1-i',.,...-,:,, ,,,,t.- 04. . .)-- • \, 21 7 -'. tork Itlki: .t.;doili.,,.:,,, 1 \ .4410 ,.,_1 ; ..„:„ - 11 ,•1, ' i .501 _,..4.0 .\\. ' , ;e:, ' -' yr ,i-_,!,,..11, I.. ,.. . ... .. rdi 11' ,/ S II 0• 1 rialt 'ROL_ Fe i a ii_ i — 4 . N , Il r ...T., *, „:\ .. _ ,. .,.,. .„.„. .• , . v ova, . -.7:--.: . . , „.. . .. 4:,._..._. .-- •• . •.:14 pi ' ViiimiC ,..„.to„, j cf of. • �'> �4 O li ' �.n � � �: A I 00 r5.-. "''.. 7 — ' ..„-fiTy Ai • - 11 1it r4 �.. _ _._: _ 0-YEAR 24-HOUR PRECIPITATI ON ffi .'4% `-- Vi- tv ISOPLUVIALS OF 100-YEAR 24-HOUR Ih� _ r I 4` J�.$"�,. i s.4 �" _ TOTAL PRECIPITATION IN INCHES Cm. , - — 01 2 34 56 7 0 Milos mod'. I ; �`•t - .2. — --- -- 3.5.1-13 1:300,000 �'t I. `'*PAG ' ( I ___E2L... KING COUNTY, { S JGTON, SURFACE W( .' E ) ESIGN MANUAL • FIGURE 3.5.11 100-YEAR 7-DAY ISOPLUVIALS 8 -:8.68;--- _ .�. 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FILE NUMBERS: FWHE#94-6, No. 133 SUB93-002 HEARING TOPIC: An application to subdivide a 1.94 acre parcel into STATE OF WASHINGTON) seven (7) single family residential lots COUNTY OF KING )ss. has been submitted. PROJECT LOCATION: The subject I,Carla Royter,being first duly sworn on oath deposes and says: property is generally located 200 feet That she is the Marketing Director of The Federal Way News, east of the southwest corner of S.W. Campus Drive and 7th Way S.W.;just a tri-weekly newspaper which is now and at all times herein north of the King County Aquatics mentioned has been published and printed in an office maintained Center. at the place of publication at Federal Way, King County, APPLICANT:Parco Group,Ltd. Washington,that by order of the Superior Court of the State of PURPOSE OF HEARING: To take Washington in and for King County, said newspaper is now and public testimony concerning the at all times mentioned herein has been approved as a legal proposed action. newspaper for the publication of any advertisement, notice, Any person desiring to be heard on summons, report, proceedings, or other official document the application is invited to attend the required by law to be published, that said newspaper was hearing or submit written comments to the Hearing Examiner, published regularly at least once each week, in the English . either by delivering these comments to the language,as a newspaper of general circulation in Federal Way, Department of Community Develop- King County, Washington, at the time of application to the ment prior to the hearing or by presen- aforementioned Superior Court for approval as a legal newspaper, ting them to the Hearing Examiner and was so published for at least six months prior to the date of ` during the hearing. The Hearing Ex- said publication,and is now and at all times mentioned herein has RECEIVED aminer will issue a decision on this been so published. matter within ten working days after theThat the annexed is a true copy of a Notice by the City I A N 2 1 1994 wh Close it the hearing. Only persons of Federal Way of February 1, 1994 land use hearing concerning • who submit written or oral comments challen- Westhill Preliminary Plat, File Nos.FWHE#94-6; SUB93-002 get the Hearinga Examiner may is . FINANCE the Hearing Examiner's decision. CITY OF FEDERAL WAY The application for approval is to be reviewed Under the applicable codes, regulations and policies of the City of Feral Way. as it was published in regular issues of said newspapers once each e Officia is available for review week for a duringed working hours(13am-5pm)in the period of one consecutive week(s),commencing City's, Departmentfile of Community Developmentl , 335 n30 1st Way South, on the 18th day of January , 1994,and ending Federal Way, Wg this maashington.er A staff repTh ort concerni tt will be available for review one week prior to 1994, both dates on the 18th day of Januarythe hearing date. Questions regarding inclusive,and that said newspaper was regularly distributed to its this proposal should be directed to subscribers and as a newspaper of general circulation during all ( Thomas, (206)hael 661-4104. Associate Planner al 04. of said period. Pub11344d in She Fudge*MOW News That the full amount of the fee charged for the On, ifijy ilk? foregoing publiC 1 is the sum of$ 47.94 . - 133 „fort Subscribed and sworn to before me this 20th day of January , 1994. A ',1,cyida &,6'A( NotaryAtblic in and for e tat,of Washington E Residing at Seattle.My coin ' ion pies 5/30/95. /ifA'11J/i V11 Cal IJIJ1KL1iU11U1V I, ``EkI pe- RSQ'') hereby declare, under penalty of perjury of the laws of the State of Washington, that: Notice of Public Hearing ❑ Determination of Non-Significance ❑ Notice of Public Meeting ❑ Mitigated Determination of Non- Significance ❑ Board of Adjustment Agenda ❑ Determination of Non-Significance Packet and Scoping Notice ❑ Planning Commission Agenda ❑ Notice of Action Packet. ❑ Short Subdivision Agenda ❑ Official Notice Packet ❑ Notice of Application for . ❑ Other _ Shoreline Management Permit ❑ Shoreline Management Permit ❑ Other was mailed/faxed/i•ost- • o/at each of the following addresses (see attached list) on 1994 r ?‘tiName of Project1‘ 1)1� ��:; '� i' �1�.,2���� Signature V(-,-.P,,__ File Number 1, % 13 - 0 t 0 - Date ( 1141,-b ,,,,* Arr WAV7.FRM REVISED 1/10/92 • /iffl.un v.c1 UC 1J1J1K1JiU11ULV v l hereby declare, under penalty of perjury of the laws of the State of Washington, that: ❑ Notice of Public Hearing ❑ Determination of Non-Significance ❑ Notice of Public Meeting ❑ Mitigated Determination of Non- Significance ❑ Board of Adjustment Agenda ❑ Determination of Non-Significance Packet and Scoping Notice ❑ Planning Commission Agenda ❑ Notice of Action Packet. D Short Subdivision Agenda ❑ Official Notice Packet ❑ Notice of Application for . ( l Other oriCE C E L1Ni) °SC Shoreline Management Permit I ❑ Shoreline Management Permit ❑ Other was mailed/faxed/posted ;to/at each of the following addresses (see attached list) on /4/ 1- Name of Project kkSt-t- , Vr-1\---Signature '~'=" File Number Fv4HEci --4c .5 J-- tn Date i (i /i7 AFFIDA\7.FR.S Rfl1SID 1/10/92 t The City of Federa fay posted the attached p_-posal to the following locations: The Federal Way Regional Library 34200 1st Way South Federal Way, 98003 Federal Way Library. 848 South 320th Street Federal Way, WA 98003 Federal Way City Hall (Bulliten Board) 33530 1st Way South Federal Way, WA 98003 r CITY OF FEDERAL WAY NOTICE OF LAND USE HEARING WESTHILL PRELIMINARY PLAT Notice is hereby given that a public hearing will be held by the City of Federal Way Land Use Hearing Examiner at 2:00 p.m. on February 1, 1994 in the Federal Way City Council Chambers, 33530 1st Way South, Federal Way, Washington 98003. FILE NUMBERS: FWHE#94-6, SUB93-002 HEARING TOPIC: An application to subdivide a 1.94 acre parcel into seven (7) single family residential lots has been submitted. PROJECT LOCATION: The subject property is generally located 200 feet east of the southwest corner of S.W. Campus Drive and 7th Way S.W.; just north of the King County Aquatics Center. APPLICANT: Parco Group, Ltd. PURPOSE OF HEARING: To take public testimony concerning the proposed action. Any person desiring to be heard on the application is invited to attend the hearing or submit written comments to the Hearing Examiner, either by delivering these comments to the Department of Community Development prior to the hearing or by presenting them to the Hearing Examiner during the hearing. The Hearing Examiner will issue a decision on this matter within ten working days after the close of the hearing. Only persons who submit written or oral comments to the Hearing Examiner may challenge the Hearing Examiner's decision. The application for approval is to be reviewed under the applicable codes, regulations and policies of the City of Federal Way. The official file is available for review during working hours (8am - 5pm) in the City's Department of Community Development, 33530 1st Way South, Federal Way, Washington. A staff report concerning this matter will be available for review one week prior to the hearing date. Questions regarding this proposal should be directed to Michael Thomas, Associate Planner at (206) 661-4104. PUBLISHED IN THE FEDERAL WAY NEWS ON JANUARY 18, 1994 . ° SW 9W ST )~ 4 6 u 28 �o, A w— A ie49eN p.-L247 2, 2 •'.o ,: > <_ SW 2�9 sT',` r Y ii `}°y 0 • °1 V ...9 �W �Q< .1 SW Zr1 i \fk ZH ~• >1 r,� Y 2 ti'°,J° >' "'' ire 4 ;LAIDE l NSW W 30ow ST '< 4 Y< <3a 1 < 301 Pt fg6Ty.1 .. v n .+ " •C'(•r..•`. SW 301 ST O ,o if �+ s'• r 1•� 7T'H. WAY" S W �P e SW 302 PL s�. N tt3 I N w7 it « 5 `' .e`r) ,.. µ.of t > :is. ^ SW 305 ST <� g. "w Z Ye 1 r 9, 'a r` ei, S 30 LAKE b * / M•.. 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Sr t `, S* 3u v1 �r $W 34 P (� . e Qs, � A ,�J` ,c� s`4SW349PLSW I4 Sf�sr1 «_!. Sb� � � „s* 3•0 Pt $• v` 3'O °to n >�" e> W349Pl >s* as, st Zi aA $W,35 $i l j sr1n �ti e" 1 <POINT `s* 131 Pt SW STI •• d '1' J .: W I N sw 35 <s«1s!�l l I S 353 Si l I ` < SW52353 $11 �' .33 d N ` ll ♦ n A 4 sg\ ii'l1 :fit 1.1.1A„ ,:297H N£ i �1* Ll741 �r AIL �� e�'�"1 5 ��ti r� 1 1 `� I I ( I 1L N ; , , r� `° 3 5.35' ST ..\ / ` l V1 N 4l 4f �j j 5. 3+� �1 $fJ$S ST VICINITY MAP b ± M c, _ < < ST * 'I N N N ! Cw tan cr MA- R LAND USE APPLICATION crilrof G W DEPARTMENT OF COMMUNITY DEVELOPMENT 33530 lit Way South•Peden!Way,WA 98003 APPLICATION NO. 5,g r93 -- 0019 Date October 13, 1993 14 i- i 3 - 00 ILI Agent Paul D. Krakow Name of Applicant 'E rco Group, Ltd. Owner Quadrant Corp. ' iston Way, Tacoma, WA 98402-5374 206/756-9921 Address 303 Phone - 3 �� �� � Signature ii Owner Name/Address Quadrant Corp. , P. 0. Box 130 Phone 206-455-2900 (if different than applicant) Bellevue, WA ytfUU9 Property Location 7th Way S.W. in Federal Way, Washington Kroll .35 Zone r-z--giiiVIIr IC 1�r kg.. Legal Description S PP a r ra rh e d. Project Description 1.94 Acre site platted into seven lots, all with frontage off of 7th Way, S.W. together with construction of seven detached single- family homes, two-story, wood frame, 1,500 to 1,800 sq. ft. each. Parcel Number(s) 192104-9002-09 Type of Permit Required: SEPA Notice Sign Checklist Mail Board , Site Plan Review R R * Land Surface Modification R R * Boundary Line Adjustment RECEIVED 6Y Binding Site Plan R R — CfMMUN TY DEVELOPMENT DEPARTMENT Short Subdivision ( Shoreline R' Subdivision * * R R OCT 1 3 1.93 Variance R R R Conditional Use R R R Use-Process I R R * Use-Process II R R R X Use -Process III R R R Quasi-Judicial Rezone R R R Variance R* R R Comp. Plan/Rezone R R — Annexation R R Lot Line Elimination —*Pre-Application Meeting R = Required * = Optional by City MASTERLA."RM SCHEDULE C n ORDER NO. 240315-5 YOUR NO. NONE THE LAND REFERRED TO IN THIS COMMITMENT IS SITUATED IN THE STATE a . OF WASHINGTON, COUNTY OF KING AND IS DESCRIBED AS FOLLOWS: THAT PORTION OF THE NORTHWEST ONE-QUARTER OF THE NORTHEAST ONE- QUARTER OF SECTION 19, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M. , IN KING COUNTY, WASHINGTON, SAID PORTION BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: COMMENCING AT THE NORTHWEST CORNER OF SAID SUBDIVISION; THENCE ALONG THE WEST LINE THEREOF SOUTH. 01°11'40)" WEST 1078.13 FEET; THENCE LEAVING SAID WEST LINE NORTH 52°58 44 8.28 FEET TO THE MOST NORTHERLY CORNER OF THE LANDS DESCRIBED INT DEEDRECORDED UNDER RECORDING NO. 7412180379, RECORDS OF SAID COUNTY AND THE TRUE POINT OF BEGINNING; THENCE NORTH 37°01'16" WEST 2.00 FEET; THENCE NORTH 52°58'44" EAST 112.82 FEET TO THE BEGINNING OE_A- CURVE CONCAVE TO THE SOUTHEAST HAVING A RADIUS OF 372.00, FEET; THENCE NORTHEASTERLY AND EASTERLY 194.78 FEET ALONG SAID CURVE THROUGH A CENTRAL ANGLE OF 30°00' 00"; THENCE. NORTH 82°58'44" EAST 70.64 FEET; THENCE SOUTH 37°01'16" EAST 169.44 FEET TO THE NORTHWESTERLYLINE OF THE TRANSMISSION LINE RIGHT-OF-WAY CONVEYED TO U.S.A. BONNEVILLE POWER ADMINISTRATION BY INSTRUMENT RECORDED UNDER RECORDING NO. 3194572, RECORDS OF SAID COUNTY; THENCE ALONG SAID NORTHWESTERLY LINE SOUTH 52°58'44" WEST 360.00 FEET TO THE MOST EASTERLY CORNER OF THE LANDS DESCRIBED IN SAID DEED; THENCE ALONG THE NORTHEASTERLY LINE THEREOF NORTH 37°01'16" WEST 252 . 60 FEET TO THE TRUE POINT OF BEGINNING. SITUATE IN THE COUNTY OF KING, STATE OF WASHINGTON. PAGE 5 OF 5 10/92 OCT 1 3 1993 1 7 MODIFIED TECHNICAL INFORMATION REPORT WEST HILL PLAT OUR PROJECT #93-40 (FEDERAL WAY FILE #SUB-93-0002) PREPARED FOR : MR . PAUL KRAKOW PARCO GROUP , LTD. 4303 N . RUSTON WAY TACOMA, WASHINGTON 98402 (206)756-9921 PREPARED BY: PACIFIC ENGINEERING DESIGN , INC. 130 ANDOVER PARK EAST , SUITE 300 SEATTLE , WASHINGTON 98188 (206) 431 -7970 /534; JUNE 13, 1994 O `FCISTLR', S1pNALO 3 tEXPIRES 8/4/'% Z ' TABLE OF CONTENTS I . PROJECT OVERVIEW page 3 to 7 T. I . R . Worksheets , Vicinity Map II . PRELIMINARY CONDITIONS SUMMARY page 8 to ZZ. III . OFF-SITE ANALYSIS (LEVEL 2) page 23 to No IV . RETENTION / DETENTION ANALYSIS AND DESIGN not applicable. . V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN not applicable . . VI . SPECIAL REPORTS AND STUDIES not applicable. . Ovppsk .(5r34wc Liv DETe:I+ilNa7i0a PAy .. Al 4o 47 VII . BASIN AND COMMUNITY PLAN AREA not applicable . . VIII . OTHER PERMITS not applicable. . IX. EROSION / SEDIMENTATION CONTROL DESIGN not applicable. . X. BOND QUANTITIES WORKSHEETS page 413to 54 2 ' TABLE OF CONTENTS I PROJECT OVERVIEW page to T. I . R . Worksheets , Vicinity Map II . PRELIMINARY CONDITIONS SUMMARY page to III . OFF-SITE ANALYSIS (LEVEL 2) page to IV. RETENTION / DETENTION ANALYSIS AND DESIGN not applicable. . V. CONVEYANCE SYSTEM ANALYSIS AND DESIGN not applicable . . ✓ I . SPECIAL REPORTS AND STUDIES not applicable. . ✓ II . BASIN AND COMMUNITY PLAN AREA not applicable. . ✓ III . OTHER PERMITS not applicable . . IX. EROSION / SEDIMENTATION CONTROL DESIGN not applicable . . X. BOND QUANTITIES WORKSHEETS page to 3 1 j WEST HILL PLAT Project #93040 Modified T. I .R . PROJECT OVERVIEW: This project consists of a 5 lot subdivision on a 1 . 94 acre site. Preliminary plat approval was received based on a 7 lot configuration . The number of lots was reduced voluntarily to provide for larger , more buildable lot areas . A 60 foot wide strip along the southerly border of the site has been designated a Tree Retention Zone. The westerly 100 feet of the site is to be dedicated as a "drainage tract" ; it contains a large ditch carrying intermittent flow. This ditch has been classified a "minor stream" by City of Federal Way staff . In addition to the drainage tract , a second tract designated as "openspace" is proposed along the southerly boundary . The total area in lots is approximately 50 , 103 sf ( 1 . 15 ac) , equivalent to a residential density of 4 . 3/ac . Existing zoning allows for a multifamily density of RM 2 . 4 . All utilities are available to the site via connections to existing facilities in 7th Way SW , which fronts the site . Adequate access is also provided via 7th Way SW. Accordingly , required plat improvements are minimal : driveway curb cuts for each lot through the existing sidewalk ; drainage stubs/sidewalk drains for each lot ; grading in selected areas ; fencing along the stream buffer ; and the improvement of an existing dirt road to asphalt paved road, for maintaining the stream course . Stormwater conveyance and detention facilities are not proposed , and therefore calculations for such are not included in this report . Justification for direct discharge is provided in the Level 2 downstream analysis (previously prepared for preliminary plat approval ) is included. Also included are cross-sections used to determine the location of the edge of stream bank , from which the 50 foot buffer is measured . RECAP OF CORE REQUIREMENTS AND SPECIAL REQUIREMENTS WHICH APPLY TO THIS SITE: 1 . Discharge at the natural location . No changes to the naturally occurring discharge location are proposed . The site will continue to drain to the drainage ditch running along the westerly margin of the site. 2 . Off-site analysis . A Level Two off-site analysis is included in this report . The report justifies direct discharge from the project to the ditch without detention . Panther Lake regional detention facility is downstream of the site. The project will pay a $1800/acre fee to mitigate impacts to this facility . 3 . Runoff Control . The project ' s contribution to runoff entering the downstream system was calculated with results presented in the Level Two analysis . Since the downstream system was shown to have excess capacity during a 100 year storm event for future developed conditions , no runoff control mitigation is necessary or proposed . � x WEST HILL PLAT Project #93040 Modified T. I . R . 4 . Conveyance system. Conveyance systems are required for collecting and discharging runoff from roof and driveway areas . All lots are provided with 6" drainage stubs . The stubs connect to 3" PVC sidewalk drains . Drainage will be tightlined from roofs and footings to the stubs/sidewalk drains . Runoff from the stubs/sidewalk drains and driveways will flow to the existing gutter along the south side 'of 7th Way . Near the northwest corner of lot 5 , the gutter flow is intercepted by a catch basin with oil -water separator and is then conveyed to the ditch via pipe . Specifications and locations for stubs and sidewalk drains are provided in the plat engineering drawings . 5 . Erosion/Sedimentation control . Interim measures for erosion control during construction are incorporated in the plat engineering design drawings . While the preponderance of the site will be left undisturbed prior to lot buildout, a portion of the site will be cleared and graded to provide more desirable building lots . Special protection is provided downslope of the graded-on lots and for the existing ditch . Mitigation includes silt fencing and catchbasin inlet protection . No sediment control structures (ponds , traps , etc . ) are proposed . 6 . Maintenance and operation . Not Applicable - no onsite drainage facilities (e. g . detention facilities) are proposed . Maintenance and operations of lot drains will be the responsibility of the finished lot owner . 7 . Bonds and liability . A "restoration and site stabilization" bond will likely be required of this project . Since there will be no drainage facilities to be operated or maintained by the City , maintenance and defect bonds should not be required . The bond amount should be based on the cost of constructing plat improvements as determined in Site Improvement Bond Quantity Worksheet , which is included in this report . 8 . Sensitive areas ordinance . The site is not located within King County designated Wetland , Erosion , Landslide, or Seismic hazard zones . City of Federal Way staff have classified the watercourse that flows along the bottom of the ditch located on the west margin of the site as a "minor stream" . Accordingly, the plat has been laid out to provide an average buffer of 50 ' from proposed Lot #5 . TIR Worksheets , Site Vicinity Map and Preliminary Conditions Summary follows : 5 Page 1 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET p�RT'1r' 'rR OJiEC T O,W N.. IERRD 11,, r 0•, i, ,+' j ';N PAR 2 M i 'i , +s 1 1 + 1', PROJEC EN NEE4t,,, . -1 S j '1ANt3DESCRIP ON�f?'/ , ''1!.;'1„:„ ', r;.!k Project Owner /2M1 I (/it dad i/, 7-0 Project Name jVESr s//LL /0M Address 4 ?0.3 /V ' ' " Ld , T(& 74 Location Phone 7-7' Jr6" 99�/ / Township 621/ 47 Project Engineer e/e///041) Trvki u , Range 4,1E Company , FG ',Ai/XI/.✓ex 4c�i-fri c Section // Project Size A 9'74 AC Address Phone /3v �40✓F�-/i c-6, e+/ram Upstream Drainage Basin Size AC )01#) 'V3/-7/70 PART:3:TYPE OF.pEF MIT,AP„PLICA ION. , `;: :PART 4`OTHER PERMITS r , Subdivision El DOF/G HPA n Shoreline Management Ti Short Subdivision (l COE 404 f-. rRockery El Grading E DOE Dam Safety 0 Structural Vaults El Commercial ED FEMA Floodplain El Other fl Other El COE Wetlands CI HPA • 'PART, 5'SITE COMMUNITY AND,DRAINAGE•BASIN h';+'• '{ ` ;;-�•,•:4,t r`'..t°. '' , ;, , '6','N` .1''1i ''l , , ' °`? Community rs- Gd. Drainage Basin r10gie- Lr9-/ce- PART 6`,SITE CHARACTERISTICS }‘ ; '' n River El Floodplain El Stream El Wetlands 0 Critical Stream Reach 0 Seeps/Springs El Depressions/Swales n High Groundwater Table El Lake El Groundwater Recharge f q'tteep Slopes .)1.- fo 907 M"-Other D1201/Nde4" Ab/,2w El Lakeside/Erosion Hazard ' PART? 'SOILS ,IiII H 1' ' ,+r k' :}, B'J, 1a l,rJi' 114• • 1 ;”lfU V,,,V s1i yhts'',p."wrfF 11rls bt'r ;7,a• t,• Isj� ( s 4, i,,,a+ s s .(, , 1i Soil Type Slopes Erosion Potential Erosive Velocities A. I-4.1 Moo Nta7� T., Nip,/ 7 3 �se El Additional Sheets Attatched 1/90 4 Page 2 of 2 King County Building and Land Development Division TECHNICAL INFORMATION REPORT (TIR) WORKSHEET � ti PARTS DEVELOPMENT LIMITATIONSI �,' ; ` { REFERENCE LIMITATION/SITE CONSTRAINT El Ch.4-Downstream Analysis rWr GJ ✓'Z .2 Qpu/Ja/S7 Syr! — D leer?' D/JCs,//l,GG El El E El Additional Shoots Attatchod PARTS ESC,REOUIREMENTS „' 1 MINIMUM ESC REQUIREMENTS MINIMUM ESC REQUIREMENTS DURING CONSTRUCTION FOLLOWING CONSTRUCTION El Sedimentation Facilities R Stabilize Exposed Surface El Stabilized Construction Entrance (—I Remove and Restore Temporary ESC Facilities 1-- -Perimeter Runoff Control IvrClean and Remove All Silt and Debris CD Clearing and Grading Restrictions 0 Ensure Operation of Permanent Facilities Dover Practices ED Flag Limits of NGPES El Construction Sequence El Other Other ;PART 10 SURFACE,WATER;SYSTEM y ED Grass Lined Channel 0 Tank Cl Infiltration Method of Analysis I 1--1" Pipe System El Vault El Depression 0 Open Channel El Energy Dissapator n Flow Dispersal Compensation/Mitigation Dry Pond ID Wetland 0 Waiver of Eliminated Site Storage 0 Wet Pond El Stream El Regional Detention Brief Description of System Operation 4o1 .- bail/Ada'Gf 7; rti I✓4.1/Jai GKrrE2) D,e/wri/ oa,//A/4$$ S,t4'4' ry 7/4440y f4/,94. e. Facility Related Site Limitations El Additional Sheets Attatchod Reference Facility Limitation A./O ;cote(G/rie r itdeprcei 1 • '1 PART 11 'STRUCTURAL ANALYSIS';''' ' ` �`, 'J ,; T4R112,:sASEMEN,TSRAt:,s .(May requlra special structural,review) n Drainage Easement El Cast in Place Vault El Other n Access Easement El Retaining Wall n Native Growth Protection Easement (— ockery>4'High I Tract O41/.14(, , 0,0Er/.44eb El Structural on Steep Slope I ) Other PART 14;SIGNATURE OE PROFESSIONAL',ENGINEER,'"' I or a civil engineer under my supervision have visited the site. Actual site conditions as observed worn incorporated into this workshoot and the f. attatchmonts. To the best of my knowledge the information provided hero Is accurate. SJgn.dVat. 1/90 fir. . . { OILET O Z \ \ /� Qp�P 9 v P0 0 \ \ \ ._ `t p��Q�xO i. \\ P j \ „\ v Gam. R y ns 2.9 r 2T' . �4. J t. I \ \ x . �• • • • /� \_\ ? ham•' �, 4. o • • a. /.' Y . • III o ♦ :: to A • • 7 . r�7u1 I f't� O O • cm p J 31?.t 'A 12mv1 r-•• • aOD!n N . I b• oya� ¢�s10 z C7C d N i `a!p2 w C U 0 2 C • C o U O u - - ''ts • "• SHEET INDEX D Q • 00 Z �E < , 0' ri •� C-1 PLAT MAPo J C-2 MASS GRADING, TEMPORARY EROSION CONTROL &UTILITIES PLAN C-.3 DETAILS, NOTES &SPECIFICATIONS C-4 DETAILS 93-40 . - I PROJECT NO. LEGAL DESCRIPTION DJ W - 1 THAT PORTION OP THE NORTHWEST ONE QUAATER OP Mt NORTHEAST ONE BRAWN BY QUARTSZ OP SECTION itTOwN51/lO 11 NORTH.RANGE 1 BATT,WM•IN STING .. CO VNTY,WASHINGTON,SAID PORTION OCING MORE PARTICULARLY DCSC:U 11CD ,y1 .:,^�{ ASPOLLOWS: 6-08-94 .T- 4 V - ISS:JE OATS COMMOSCING AT THE NORTHWEST CORsE2 OF SAID SL'ODIVLSSON; 71-G•+CE ALONG THE WEST UNE THESE-OP SOUTH il'21'10'WEST 1071.13 FEET THENCE �yD� _ LEAVING SAID WEST LINE NORTH 3'.'SCN•0AST 7FEET.21 FEET TO THE MOST �niJ� .y NORTHERLY CORNER OF THE LANDS DESCRIOED.Dl DEED RECORDED UNDER SNEeT RE`/I SIGN RECORDING NO.TI I:I30377,RECORDS OP SAID BOUNTY AND THE TRUE PAINT OF V . -.. • "THENCE mar Ild IK cut29A.l7 k.C,R.f_WTM3. NORTH 37-71.16'WEST 170 FCC, THENCE NORTH S.'S3,6-CAST 112.32 - - FEET TO THE BEGINNING OP A CURVE CONCAVE TO MC SOUTHEAST HAVING A RADIUS OF 37130 FEET,THENCE NORTHEASTERLY AND EASTERLY 134.71 PEET ' ALONG SAID CURVE THOROUGH A CENTRAL ANGLE OP 30.00-30%THENCE NORTH I 32'316A'CAST 7061 FEET- THENCE SOUTH 37.71'16'CAST I39m FEET TO 0(C IiRY'AND�7OSZH1d.3:DPOdRAPpIC INFORMATION PR01gD[II:1><:' NOKT wESTZA Y EINt of Mc D 5S.1S0:ON LINE IUGHT-Or-w.AY CONVEYED TO USA.BONNEVILLE POWER AOMINIS:RATON BY INSTRUMCYT RECORDED arNTY.LAND SURVEYING, INC..(2041 42tcaILTi UNDER RECORDING NO.3E7637=.RECORDS OP SAID COUNTY: THENCE ALONG irOY/NO ermines'S'NO6NV/ffE'REdV MAI/E BEEN-PLOTTED .: SAID NORTHwCSTL:U•Y UNC SOUTH SS•SPIA WEST 360.00 PELT TO TOO MOST ''C���T/pN LV PILOE LOCATED iL/RfYCC fE.07LREJ'6.-'T' I 'LASTTC.L•Y CORNER OP Na LANDS DESC:000D IN SAID DEED; THENCE ALONG SRMAT/QN /RCMI Ap.ENACT.ORAW/NCS AS'PROWO WOOED .. A'-.-.'- THC NOR:HC p ccciY LINE THEREOF NORTH 57.01•I6•WC1T ss1:0 PELT TO THE _ /TY..O.'• P OERAG`+WAY. -. -.' • -•.'_ "-N.A. TRUE POIM OF BEGINNING /1TY. LAND SP/RVEYIN$ DOMINANT ASSUMES NO�%PESACI. 6YBIZ/T �.CORRECTNESS Of TN/S RECORD DATA. - .,. 70 SITVATt IN THE COUNTY CIF KSNG,STATE OF WASIWVGTpN. r CIVIL ENGINEERING AND 4` °•'' I i PLANNING CONSULTANTS 8 WEST HILL PLAT Project #93040 Modified T. I . R . Preliminary Conditions Summary 7 DEC-21-1993 12:4u FROM PriRCO GROUP. LTD TO 12064317975 P.02 clrr of 7 _ a v. • 3353 1ST WAY SUI (2 )651 4000 FEDERAL WAY,WA 98003.6210 December 14, 1993 Mr. Paul Krakow Parco Group, Ltd. 4303 North Ruston Way Tacoma, Washington 98402-5374 RE:. MITIGATED ENVIRONMENTAL TZ LESNOLD DETERMINATION; APPLICATION 1 Oz SEP93-0019 Dear Mr. Krakow: The Environmental Checklist- you have submitted has been reviewed by this office and other staff. We have determined that the proposal, in conjunction with mitigation measures identified in the attached Mitigated Determination of Nonsic nifi Vance, does not have a probable significant adverse impact on the environment. These measures have been . ..established to mitigate specific probable significant adverse environmental .impact: identified in 'ehe Environmental Checklist and .related documents. As a result, an Environmental Impact Statement (EIS) is not required to comply with the State Environmental Policy Act (SEPA) : if each of the attached measures are properly implemented. A copy of the determination is enclosed. A fifteen (15) day comment period is required by the SEPA Rules (WAC 197-11-340) . A notice inviting comments was published in the Federal Way News on . Racem ,e 16,4_1293 . At the end of the comment period, the Department will determine if the MDNS should be withdrawn, modified, or issued as proposed. All final determinations may be appealed within fourteen (14) daye following the comment deadline. No licenses, permits, or approvals will be issued until completion of the appeal period. Our decision not to require an EIS does not mean that the license, permit, or approval you are seeking from the City has been granted. Approval of denial of the proposal will be made by the appropriate administrative or legislative body vested with that authority. The environmental record is considered by the decision maker(s) and conditions may be imposed to reduce identified environmental impacts as long as the conditions are based on adopted and designated City .policy: After a final decision has been made on your proposal (i.e. , after a permit has been issued or City Council action taken, as DEC-21-19`_!_ 12:-1:= FROM 4i P,A4'CCi CROUP, ,-;'E TO 1_116,.:1',' /0 • Mitigated Environmental Threshold Determination December 14 , 1993 Page 2 applicable) , you may, but are not required to, publish a Notice of Action as set forth in RCW 43 .2lC.075. The Notice of Action seta forth a time period after which no legal challenges regarding the proposal's compliance with SEPA can be made. A copy of the Notice of Action form and copies of RCW 43 .2lC. 080 and WAC 197-11-680, providing instructions ,for giving this notice, are available from the Department of Community Development. The City is not responsible for publishing the Notice of Action. However, the City .is responsible for giving a notice (to parties of record) stating the 'data - for for commencing a • j.udicial appeal (including the SEPA portion of that appeal) if your proposal is one for • which the City's action on it has a specified time period within which any court appeals must be made. A Hearing Examiner hearing has been scheduled from January 18, 1993. Land Use Committee and City Council review dates are tentatively scheduled for February 8th and 15th respectively. If you need further assistance feel free to contact .me at 661-4104 . Sincerely, Michael Thomas Associate Planner • cc; Kathy McClung, Land Use Administrator • file Utz.-21-1`_+J 1 .'' I-KLiF I 1-1-0 _IJ L,kJLI'r, LID I i I 1 Lu=,a 1r'+ _ N.Ua • CITY OF FEDERAL WAS' DEPARTMENT OF COMMUNNY DEVELOPMENT 33530 1 st Way South Federal Way, Washington 98003 (206) 661-4118 MITIGATED ENVLRONMENTAL DETERMINATION OF NONSIGNIFICr-ANCE Federal Way File Nos. SUE93-0002,SEP93-0019 Description of Proposal: The project proponent is proposing to subdivide a 1.94 acre parcel into 7 single family residential lots. Location: The property is generally located near the I .C. Aquatics Center on 7th Way S.W.,just east of S.W. Campus Drive. (see attached vicinity map). • Lead Agency: • • City of Federal Way, Department of Community Development Staff Contact Person: Michael Thomas., Associate Planner, (206) 661-4104 • The responsible official of the City of Federal Way hereby make the following Findings of Fact based upon impacts identified in the environmental checklist and the "Final Staff Evaluation" for the environmental checklist, Application Nos. .SUB93-0002 and SEP93-0019; Conclusions of Law based upon the Federal Way Comprehensive Plan and other municipal policies, plans, rules, and regulations designated as a basis for exercise of substantive authority under the Washington State Environmental Policy Act Rules pursuant to RCW 43.21C.060. Findings of Fact: 1. The 'Final Staff Evaluation for Environmental onmental Checklist Application No. SEP93-0019 is hereby incorporated by reference as though setforth in full. 2. The proposed action is to create seven (7) single family residential lots. 3. The project will utilize the Panther Lake Regional Storm Water Facility for detention and infiltration purposes. i!t�_- 1-1�7_ 1=• 1� rruri rrr,•._v . .__u , • - --- - Ia • • 4. The applicant submitted a Level 2 Downstream Analysis dated November 10, 1993 prepared by DOWL Engineers. The report concludes that the adjacent stream has the capacity to accommodate and convey any runoff from the proposed plat to Panther Lake. 5. The proposed subdivision will generate 7.07 p.m. peak hour trips, which is less than the • "10 trip" threshold requiring that a traffic impact analysis be prepared. 6. A minor stream as defined by the Federal Way City Code flows along the property's west property line. Conclusion of Law: • 1. Allow for residential development only when supported concurrently by adequate services including roads, utilities, transit, parks, recreation, schools, fie, and police (policy H-4, FWCP). • 2. Enforce measures to be taken, during construction to prevent erosion (policy NE-6, • FWCP). • 3. Assure for all people of Washington safe, healthful, productive, and aesthetically and • culturally pleasing surrounding (policy 10,230.20(2) Federal Way Environmental Policy Ordinance. • 4. Require environmental impact.assessment and mitigation of potential impacts to sensitve areas before development is permitted (policy NE-9, FWCP). 5. Retain existing wetlands and drainage channels to recharge aquifers and contain storm water run-off (policy NE-14, FWCP). 6. Prepare maintenance standards to protect storm water systems, prevent erosion and protect natural vegetation (policy I-1-30, FWCP). 7. Give high priority to solving residential environmental problems relating to health and safety (policy HI-26, FWCP). The lead agency for this proposal has determined that the proposed action does not have a • probable significant adverse impact on the environment and an Environmental Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c), only'if the following conditions are met. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available upon request. Conditions: • 1. In order to facilitate periodic maintenance of the stream channel the existing dirt road along the northeast side of the stream channel will need to be improved to 12 feet wide t), and surfaced with grass-pavers or other approved surfacing material for the entire length of subject property. \�, 2 � 2 DEC-21-1=+9= 12:5n FROM F'HF'I:O C OUF' LTD TO 12Ll6- i'r'3'r`_ 1-.Uo /3 . 2. Due to site topography a preliminary mass grading plan based on 5-foot contours shall •.� 4 be submitted prior to preliminary plat approval. During engineering plan approval the ±'' v' , n preliminary grading plan shall be refined to 2-foot contours. Actual mass grading of the ,�.C' 4,� site based on the final approved grading plan shall be.completed prior to recording of the v)` 5'„ l subject plat. This MDNS is issued under WAC 197-11-340(2); the lead agency will not act on this proposal. for jj days from the date of issuance. Comments must be submittal by December 31, 1993. Unless modified by the City, this determination will become final following the above comment • . deadline. Any person aggrieved of the City's determination may file an appeal with the City within 14 days of the above deadline. Staff' Contact Person: Michael'Thomas, Associate Planner, (206) 661-4104 • Responsible Official: Kenneth E. Nyberg Position/ '`itie: Assistant City Manager Address: 33530 First Way South, Federal Way, Washington 98003 Date Issued: 1`" 3_-. ,� .r.G .�:"YGe vim- e'l Signature: ! l • • ', .,. ........—__.................. .. ._ .....„...s2..., , .7 ";'" CITY OF r""'""" C_ ;. t O • (206)661-4000 Firy 33530 1ST WAY SOUTH FEDERAL WAY,WA 98003-6210 December 1, 1993 Mr. Paul Krakow Parco Group, Ltd. 4303 North Ruston Way Tacoma, WA 98402-5374 RE: West Hill Preliminary Plat FW File Number SUB93-0002 Dear Mr. Krakow: Absent from my November 12, 1993, letter was Public Works comments regarding the above referenced project. Below you will find applicable comments regarding submittal requirements and likely mitigation measures. Also, please find attached a Preliminary Plat Review Checklist. Storm Drainage, Grading & Erosion Control 1. On-site detention is required in accordance with the 1990 King County Surface Water Design Manual (KCSWDM) and recommendation of BW-2 of the Hylebos Creek and Lower Puget Sound Basin. However, as previously discussed, the option exists for using Panther Lake Surface Water Facility for storm water detention. The Level 2 Downstream Analysis indicates that the downstream conveyance system has adequate capacity to handle site runoff to Panther Lake. Therefore, no downstream improvements are required other than channel clearing. Staff concurs with the Level 2 Downstream Analysis that trash and debris be removed from the stream as well as trimming woody vegetation, consisting mainly of young alder trees. An engineering plan and supporting calculations will be required during plat improvement design showing the driveway/roof runoff collection system from the proposed lots to the stream. If determined feasible by the City, it shall be your responsibility to retrofit a FROP style oil/water separator in the existing catch-basin that discharges into a 30" CMP and into the stream as part of the required plat improvements. 2. A preliminary grading plan showing 2-foot contours needs to be submitted as part of the preliminary plat review process. Please assume a 2,000 square foot building pad and a 20-foot wide driveway. 3. A Temporary Erosion/Sedimentation Control plan needs to be submitted for engineering review. The Plan shall address control measures proposed during site grading and construction. /S Mr. Paul Krakow • December 1, 1993 Page 2 Preliminary Plat Mitigation The following mitigation measures are noted as part of the comments received from the Public Works Department. The following should not be considered an all inclusive list of mitigation for this project. Mitigation measures are as follows: 1. In order to utilize Panther Lake for storm water detention purposes a pro-rata share contribution for the capital costs of the Panther Lake Surface Water Facility will need to be made in the amount of$1,800/acre. The total amount payable prior to recording of the plat will be $3,942.00 dollars. 2. Proposed Tract "B" and "C" shall be dedicated to the City for storm drainage and open space respectively. 3. The existing dirt road along the northeast side of the stream will need to be improved for access and maintenance of the stream. The road shall be improved to 12 feet wide and surfaced with grass-pavers for the entire length of the property. 4. A mass grading plan shall be submitted for this development. As noted above, please assume a building pad of 2,000 square feet and a 20-foot driveway for each lot. All disturbed areas shall be seeded after grading. Site grading shall be accomplished prior to recording of the proposed plat. If you have any questions regarding this letter or your project in general, please feel free to contact my office at 661-4104 or Jeff Sharp, Engineering Plans Reviewer, at 661-4125. Sincerely, Michael Thomas Associate Planner end: Preliminary Plat Review Checklist c: Kathy McClung, Land Use Administrator Jeff Sharp, Engineering Plans Reviewer Rich Tomkins, Pacific Design Engineering 9)-4/0i4 RECEIVED MAR 0 2 1994 PACIFIC ENGINEERING CITY OF FEDERAL WAY OFFICE OF THE HEARING EXAMINER IN THE MATTER OF: ) FWHE#: 94-6 FILE # : SUB-93-0002 UPR-93-0014 PRELIMINARY PLAT OF WESTHILL ) SEP93-0019 ) I . SUMMARY OF APPLICATION The applicant is requesting preliminary plat approval to divide a 1 .94 acre parcel into seven (7) single family residential lots as provided for under Chapter 20, Subdivisions, Federal Way City Code and Chapter 58 . 17 Revised Code of Washington (RCW) . City of Federal Way City Code sets forth subdivision review process as Process III review. Under Process III review the hearing examiner conducts a public hearing on the matter, and after consideration of testimony and facts presented makes recommendation to the City Council who possess final authority to grant or deny the plat request. II. PROCEDURAL INFORMATION Hearing Date: February 1, 1994 Decision Date: March 1, 1994 At the hearing the following presented testimony and evidence: 1. Michael Thomas, Associate Planner, City of Federal Way 33530 - 1st Way South, Federal Way, WA 98003 2 . Rick Tompkins - 130 Andover Park East, Suite 300, Seattle, WA 3 . Henry Griffin - 4303 North Ruston Way, Tacoma, WA 4 . Jeff Sharp, Public Works Department, City of Federal Way - 33530 1st Way South, Federal Way, WA 98003 17 At the hearing the following exhibits were admitted as part of the official record of these proceedings: 1. Staff Report with attachments III. FINDINGS 1. The Hearing Examiner has heard testimony and taken this matter under advisement. 2. The Community Development Department staff report sets forth general findings, applicable policies and provisions in this matter, and is hereby marked as Exhibit 1 and incorporated in this report by reference as though set forth in full herein. 3 . All appropriate notices were delivered in accordance with the requirements of the Federal Way Zoning Code. 4 . The applicant has a possessory ownership interest in a 1.94 acre parcel of property located on the south side of 7th Way S.W. immediately east of its intersection with 336th Street within the city limits of Federal Way. The site is a rectangular shaped parcel of property bordered on the north by the 7th Way S.W. right of way and on the south by the Bonneville Power Administration transmission line easement. The extreme western portion of the site is bisected by a drainage ditch/intermittent stream which flows into the Panther Lake regional detention facility. The stream flows through a culvert beneath 7th Way S.W. , empties onto the applicant's parcel, and flows basically in a straight line to the south property line. Adjacent to the stream is a dirt road which extends from 7th Way to the bank of the stream, and then alongside the stream to the south property line. 5. The applicant is requesting preliminary plat approval to allow subdivision of the site into 7 single family residential lots with lot sizes ranging between 7,200 and 7,400 square feet. The proposed lots are long and narrow, extending south from 7th Way S.W. Lots 3 through 7 are the most narrow lots with widths of 36 feet. The site is located within the RM 2400 zoning district which allows multi family dwellings. Said zone classification also allows single family dwellings with a minimum lot size of 5,000 square feet and five foot side yard setbacks (Section 22.666 Federal Way City Code [FWCC] ) . The applicant's building envelope on lots 3 through 7 is only 26 feet wide, but the proposed plat conforms with the bulk requirements of the RM 2400 zoning district. 6. The site naturally drains into the stream, traversing the west portion of the site. Soils on the site are classified as Alderwood and Everett gravelly sandy loam which are moderately well drained. The soil is generally suitable for single family construction. The topography of the site slopes down from east to west with slopes reaching 40% along the eastern I ? boundary. Vegetation is a mixture of second and third growth coniferous and broad leafed trees native to the Pacific Northwest. The applicant is required to retain 25% of the significant trees in accordance with the FWCC. There are no significant endangered or threatened plant or wildlife species on the site. 7 . Surrounding development includes The Ridge, a single family subdivision located west of the site, and the Glen Park Apartment Complex to the north. To the west, across Campus Drive, is the Highlands Development, while to the south is the King County Aquatic Center and its associated recreational opportunities. The proposed subdivision of the site into seven single family residential lots is compatible with existing development. 8. Each lot will access directly onto 7th Way S.W. which is approved to full street standards including vertical curbs, gutters and sidewalks. No further street improvements are required. The applicant is providing open space in the nature of a 50 foot wide tree retention area that will act as a buffer between the building envelopes and the BPA easement. Restrictive covenants will prevent tree cutting in the retention area designated on the face of the plat. The plat reflects a 20 foot buffer between the building areas of the lot and 7th Way S.W. 9 . The site will generate approximately seveb p.m. peak hour vehicle trips and 67 average daily trips. Such volume is not sufficient to require a traffic study. Public transit is available approximately one-quarter mile from the site. 10 . The schools serving the site are Panther Lake Elementary, Illihee Junior High, and Federal Way Senior High. All schools have adequate capacity to serve students residing in the plat. 11. The Federal Way Water and Sewer District will provide both domestic and fire flow water to the site, and the fire district has approved the location of fire hydrants to serve the site. 12 . The only issue which arose between the applicant and staff concerned mitigating measure no. 1 contained in the MDNS. This measure requires that the applicant widen the dirt road alongside the stream to 12 feet, and surface it with grass pavers or other approved surfacing material for its entire length. The applicant objects, stating that he is already providing a 50 foot buffer for the intermittent stream/drainage ditch and that resurfacing and widening the road will interfere with the buffer. The applicant also states that grass pavers are extremely expensive for a seven lot single family subdivision. As an alternative, the applicant offers to provide a gravel surface over the existing road. The City responds by stating that the plat is providing '9 neither detention or retention of storm water, but is directly discharging all plat drainage into the stream. Access is required for any storm water facility such as biofiltration swales and detention ponds. Maintenance will also be required for this stream to remove accumulation of trash, woody plants, and trees that are interfering with the stream channel. The City also indicates that plastic grass pavers are available at approximately 25% of the cost indicated by the applicant. The City objects to a gravel surface, as during large storm events, the water may cover the gravel surface and wash it away. 13 . The requirement for improving the existing road and surfacing it with grass pavers is a mitigating measure required by the MDNS which was issued on December 13, 1993. The MDNS became final on December 31, 1993. The final paragraph of the MDNS reads as follows: Unless modified by the City, this determination will become final following the above comment deadline [December 31, 1993] . Any person aggrieved of the City's determination may file an appeal with the City within 14 days of the above deadline. The above language is consistent with Section 18 .51 (a) FWCC which states as follows: Any interested party may appeal to the Hearing Examiner a threshold determination, or the adequacy of a final environmental impact statement and conditioning or denial of an action. (c) all appeals filed under this section must be filed in writing with the City Clerk within 14 calendar days of the date of the decision appealed or the conclusion of the comment period or completion of the giving of required notices, whichever is longer. The Hearing Examiner has no jurisdiction to hear an appeal of a decision of the City of Federal Way environmental official unless a timely appeal is filed. Therefore, the Examiner has no authority to grant relief to the applicant. However, following review of the issue, it is the Examiner's opinion that it is reasonable for the city to require an access to the stream for maintenance personnel and equipment. It is questionable whether such access needs to be provided for the entire length of the property and to the specifications required by the City. 14 . Preliminary plats are processed through Process III review criteria as set forth in Section 22-490 (d) FWCC. Findings required on each criteria are hereby made as follows: A. The project is consistent with the City of Federal Way Comprehensive Plan. Both single family and multi family uses are allowed in the zone classification of RM 2400 . 20 The 1990 Federal Way Comprehensive Plan designates the area as high density residential. The applicant's proposed use is much less intense than a multi family development and will have less impact on City services and facilities than if developed in accordance with the comprehensive plan and zone classification. The project also meets numerous comprehensive plan policies which address adequate services, zoning, transportation, minimum areas for subdivisions, maintenance standards, vegetation, open space and landscape buffer zones. B. The project is consistent with all applicable provisions of the Federal Way Zoning Code. The site meets the lot size, yard, lot coverage, parking and sign requirements, as well as all other bulk regulation of the RM 2400 zoning district. The project is also consistent with the Environmental Policy Code, Methods to Mitigate Development Impacts Code, Federal Way Subdivision Code, and all other applicable development codes and regulations. C. The project is consistent with the public health, safety and welfare. The applicant is proposing a substantially less dense project than allowed by both the comprehensive plan and the zoning. The project is consistent with existing development in the immediate area. 15. The proposed subdivision is also consistent with the purposes set forth in Section 20-2 FWCC, the design criteria and development standards of the FWCC, other applicable ordinances and regulations and the requirements of Chapter 58. 17 RCW. IV. CONCLUSIONS From the foregoing findings the Hearing Examiner makes the following conclusions: 1. The Hearing Examiner has jurisdiction to consider and decide the issues presented by this request. 2. The proposed preliminary plat of Westhill satisfies the Process III decisional criteria set forth in Section 22-490 (b) FWCC as well as the criteria set forth for subdivision review in Section 20-2 FWCC. The site likewise meets the design criteria and development standards set forth in Sections 20- 151 through 20-157 and 20-178 through 20-178 FWCC, as well as other applicable ordinances and regulations of the City. 3. The proposed preliminary plat makes adequate provisions for the public health, safety and general welfare, for open spaces, drainage ways, streets, alleys, other public ways, water supply, sanitary waste, fire protection, parks, 21 playgrounds, and schools. The proposed plat will serve the public use and interest by providing an attractive location for a single family residential subdivision in close proximity to recreational opportunities in a growing area of the City. Therefore, the proposed preliminary plat of Westhill should be approved subject to the mitigating measures set forth in the MDNS. RECOMMENDATION: It is hereby recommended to the City Council of the City of Federal Way that the proposed preliminary plat of Westhill be approved subject to the mitigating measures set forth in the Mitigated Determination of Nonsignificance. DATED THIS 1 DAY OF March, 1994 . ST N . CAUSSEAUX, Hearing Examiner IZ VI. RIGHTS TO RECONSIDERATION AND CHALLENGE Any person who has a right to challenge a recommendation under the Federal Way Zoning Code may request the Hearing Examiner to reconsider any aspect of his or her recommendation by delivering a written request for reconsideration to the Planning Department within seven (7 ) calendar days after the date of issuance of the Hearing Examiner's recommendation. The person requesting the reconsideration shall specify in the request what aspect of the recommendation he or she wishes to have reconsidered and the reason for the request. The distribution of the request and the response to the request shall be governed pursuant to the provisions of the Federal Way Zoning Code. Within ten ( 10 ) working days after receiving a request for reconsideration, the Hearing Examiner shall notify the persons who have a right to appeal under the Federal Way Zoning Code, whether ' or not the recommendation will be reconsidered. The Hearing Examiner may reconsider the recommendation only if he or she concludes that there is substantial merit in the request. The process of the reconsideration will be followed in accordance with the Federal Way Zoning Code. The recommendation of the Hearing Examiner may be challenged by any person who is to receive a copy of that recommendation pursuant to FWZC 155 . 60. 6. That challenge, in the form of a letter of challenge, must be delivered to the Planning Department within fourteen ( 14) calendar days after the issuance of the Hearing Examiner's recommendation or, if a request for reconsideration is filed, then within fourteen ( 14) calendar days of either the decision of the Hearing Examiner denying the request for reconsideration or the reconsidered recommendation. The letter of challenge must contain a clear reference to the matter being challenged and a statement of the specific factual findings and conclusions of the Hearing Examiner disputed by the person filing the challenge. The person filing the challenge shall include, with the letter of appeal, the fee established by the City. The challenge will not be accepted unless it is accompanied by the required fee. The recommendation of the Hearing Examiner may be challenged whether or not there was a request to reconsider the Hearing Examiner's recommendation. 13 WEST HILL PLAT Project #93040 Modified T. I .R . LEVEL 2 DOWNSTREAM ANALYSIS Introduction: The proposed Preliminary Plat of "West Hill " was introduced to the City of Federal Way ' s Development Review Committee at a preapplication conference on June 3, 1993. On June 22 , 1993 the DRC issued a comment letter identifying preliminary development standards that would be imposed on the project . In the letter , it was indicated that , as an alternative to providing on-site stormwater detention , the project could pay an $1800/acre impact fee and utilize the Panther Lake Regional Detention Facility . This option could be selected provided a Level 2 downstream analysis determined that the downstream system had capacity to convey the additional runoff resulting from direct discharge . Prior Studies: The project site lies near the lower end of the Panther Lake West Tributary conveyance system. This system was previously studied by Brown and Caldwell with results presented in their December 1992 "Level 2 Hydraulic Analysis" report to Erickson McGovern Architects . The study was requested by the City of Federal Way to assess impacts of the development of Junior High School #6 on the West Tributary system and on Panther Lake regional detention facility . (Portions of the report are included herein for reference. ) Brown and Caldwell performed a comprehensive field survey of the West Tributary system. Their study broke the system into several reaches each of which were analyzed for conveyance performance during various storm events under existing and future land uses . Two of these reaches , designated RCHRES11 and RCHRES12 , are immediately downstream of the project site. RCHRES11 is an open drainage swale that crosses the westerly end of the site carrying flows south . RCHRES12 is part swale and part culvert and carries runoff the balance of the way to Panther Lake. Brown and Caldwell ' s report presented the following conclusions : Reach Ultimate Est ' d Peak Runoff from Capacity Developed (Future) Basin RCHRES11 330 CFS 260 CFS ( 100 yr - 24 hr storm) RCHRES12 >500 CFS 260 CFS ( 100 yr - 24 hr storm) 24 WEST HILL PLAT Project #93040 Modified T. I . R . Analysis: The drainage basin considered in Brown and Caldwell ' s Level 2 Analysis includes flow contributions from the developed project site . Their conclusions clearly indicate that the project ' s downstream system has excess capacity to convey all basin storm runoff up to and exceeding a 100 year event . The additional information provided by this report includes : (a) a narrative description of the downstream system (reaches RCHRES11 and RCHRES12) , and (b) calculation of the developed project ' s peak runoff rates for three major storm events . (a) Onsite Basin and Downstream System Description: The project site is approximately 1 . 94 acres in size . It is roughly rectangular in shape and is bounded on the north by 7th Way South . To the west is a parcel owned by Federal Way Water and Sewer District which is the site of a well and pump station. To the east is undeveloped land which is part of an open space tract for the Plat of The Ridge . The south is bounded by a 200 foot wide B . P .A. transmission line easement . The preponderance of the site slopes east to west at approximately 10 percent . The easterly two-thirds of the site is heavily wooded with predominantly evergreen species , and there is a relatively thick understory of brush and grasses . The westerly third is remarked by several storm drain outfalls extending from 7th Way and daylighting into a broad south-trending swale. The culverts discharge drainage from the West Tributary upstream basin. The preponderance of the site also drains directly to this swale . The following is a narrative description of the field inspection of RCHRES11 and RCHRES12 made June 21 , 1993 by Richard Tomkins P . E . : Drainage enters the site via three 48" concrete culverts crossing under 7th Way . Two 30" CMP culverts also release upstream drainage onto the site at this location . The pipes daylight into a broad south-trending swale. This swale corresponds to Brown and Caldwell ' s study reach RCHRES11 . The swale cross-section is very large but is not uniform. Width varies from 40 to 90 feet , depth varies from 6 to 10 feet . The first 15 feet of this swale is armored with rip rap . Thereafter , the swale has a flat muddy bottom of varying width (3 ' to 15 ' ) with grassed sides . Water appears to pond at a depth of 1 ' , with sluggish flow confirming minimal gradient . A dirt road parallels the north side of the water course extending from 7th Way to near the south property line. The watercourse narrows to a 3 foot wide stream where it exits the site approximately 50 ' east of the southwest property corner . WEST HILL PLAT Project #93040 Modified T. I . R . Flow thence continues southerly along the bottom of the broad swale becoming a meandering stream as it crosses the B . P . A . right-of-way . The swale bottom at this point changes from mud to stone with scattered grass and weeds . Flow here is less sluggish due to a slightly steeper gradient and has a depth of 4 to 6 inches . The stream banks are thick with stands of small alder- like saplings and the swale sides are heavily grassed . The swale cross-section appears to be more uniform here and remains quite large - 30 to 40 feet wide and approximately 10 feet deep . Quantities of debris (cut brush and construction materials) was observed near the east edge of the B . P . A . right of way . This tends to obstruct the current low flows , but the overall swale cross-section is so great that ample capacity is available for larger flows . Flow exits the B . P .A. right-of-way and continues southerly along the bottom of the same broad swale until entering a 75" x 112 ' arch CMP located near the west end and behind the County Aquatics Center . Here the swale has been filled to provide a flat yard area. The upstream end of the arch CMP corresponds with the beginning of Brown and Caldwell ' s study reach RCHRES12 . (RCHRES12 extends south to Panther Lake) . Approximately 100 feet upstream of the Aquatics Center , the streambed widens to about 6 ' and flow meanders through a rock lining made up of 6" to 8" quarry spalls . The arch CMP is approximately 220 ' long and daylights midway along the Center ' s frontage, discharging flow again to a rock- lined streambed at the bottom of the reopened swale . Here the rock lining is comprised of larger rip rap up to 18" in diameter and current drainage flow was barely visible as it meandered under the rock . Flow continues southerly towards Panther Lake as the gradient from arch CMP to the lake steepens to about 3 percent . Approximately 150 ' northeast of the Aquatics Center , the swale opens and flow is released to the lake over a broad rocklined apron. As anticipated from reading the Brown and Caldwell report , the June 21st downstream inspection confirmed that the entire drainage course has an extremely large cross-section with correspondingly large conveyance capacity . No evidence of stability problems or significant erosion was observed. Water quality was poor at the culvert outfall from 7th Way , but improved as flow left the site and proceeded downstream. The improvement apparently due to the biofiltering action of intermittent patches of grassy vegetation along portions of the stream course upstream of RCHRES12 . No basis was observed for assuming any significant adverse impact would . result from allowing project runoff to enter the system unrestricted . ZG WEST HILL PLAT Project #93040 Modified T. I . R . (b) Developed Project ' s Peak Runoff Rates : The project ' s contribution to runoff entering the downstream system was calculated using the "Waterworks" hydrology software program. This program employs Santa Barbara Urban Hydrograph Methodology to model the contributing basin and derive peak runoff rates . The following is a recap , of the results of the "Waterworks" analysis performed to estimate unrestricted runoff rates for the developed site : Design Storm Peak Runoff (CFS) 25 year 24 hour 1 . 08 100 year 24 hour 1 . 41 100 year 7 day 0 . 54 (Supporting calculations and "Waterworks" basin summary reports are attached . ) CONCLUSIONS: 1 . At 1 . 41 CFS , the developed site ' s unrestricted peak 100 year storm runoff amounts to only 0 . 5% of the total flow estimated for the West Tributary basin under developed (future) conditions . 2 . Brown and Caldwell ' s report concludes that the portion of the West Tributary system that is downstream of the project has considerable excess capacity under developed (future) conditions . 3 . Field inspection confirmed that the system has a very large cross-section along its entire reach to Panther Lake . Conveyance capacity results derived by Brown and Caldwell appear entirely reasonable . Accordingly , free discharge (discharge without on-site detention) as is proposed for this project , should not result in any adverse impacts to the downstream system. It is recommended that ongoing maintenance of the system (removal of trash and debris , thinning of woody vegetation , etc . ) occur on a regular basis to ensure continued good conveyance performance and water quality . WEST HILL PLAT Project #93040 Modified T. I .R . The following pages present Excerpts from Brown and Caldwell ' s December , 1992 Level 2 Downstream Analysis and hydraulic analysis calculations for the project site . Z.g S 312th 11 i a, I ' i Panther Lake 1 WHI2 ) x x S 324th 0 / _.� r wHi. b I11 , SW 336th IIfrb 5336th WH16AN__/- i \( West Branch• Hylebos Creek 1 • r I Federa!WININWAIIIIII ay \ . wins -} 9 ./:,: ,:imiin:i„: \ 1 SW 356th /1#r3, \ V\\jel‘j , . .::', . o S 360th Y 2\CI t• .,D 0 TA 0 West Hylebos ��1• Wetland a ••`�, 1 Milton \. 0 o .. o ®a • o Key. ,. Z"'— Bodies of Water Basin Boundary 0 0.5 1 - . Subcatchment Boundary Scale in Miles wH14 Subcatchment Numbers Figure 1 Panther Lake Drainage Basin 16373a O WJ W �' a Q + + + \ 4. \ + a >- + + + ♦ ♦ + + + } + + + + ' « ' \ 2 lwl. + } + a ♦ + .♦ + y L+ a + + + } + + } } + + + + + • • • • • cs + 4 + 4 + } + ♦ + ♦ + + + 1 eN•s) \ 1\................,... .." + + + + + + • . * 4 + + + c? +"+ + + + + + + 4 + . I f/ + ♦ ♦ + ♦ ♦ ♦ ♦ # 4 1 o\am\ 1:( • + + • + ♦ + • \ s'''..n. '---:-.7\-*, \ r- 4. « 4. « • « « M r, ' 4. v?...\--1/4s1 \ \.1,:-,\\ LLI . LLI + + + 4. + ,09 ''Z. 0 L)\-\ 1 + + + . r 1/432. 15.0 \'\ C 1 s Z ' ' i ssos da • ' do . , I \• ... y1i . e , . . ....•j ? D -/• C-10\_7‘...„) LA- . \ V It 1. \ '\\ . l' .' i• ° s ,.„ \ i l.J 0.... ` ' U \ 9� CO 6� \ L W, N Cj / i \ _ 1- ' d\ 1r N \ �` gra" 4617 '? o,71 .... .".''\ \ • ) \ , H I \ N 1 \ • t V I I. -1 • 00 I.. / It tt TT 1 t ' ..., •• i "7 • „, t __.... ...... ____ ,<.• • V 0 v O, zJ� '`\......... I ` elS' tt r--• . ' '1 or IS . L \\‘) :4 -- !I- Amy - —7- -" •__ if a0 ��, cm FRom 6ww.4 AL. .Iw x . ... . \ . tie_✓ ...5.- < ,` ,�`� �yti ,y, �9 14Sf`� v) rr� d��P�l u n I \ ��h \ \ co a 9 9. D;/1 \ s1,Y' .< 30 • 12 Table 6 . Conveyance Elements and Capacities HSPF routing Actual elements Ultimate element capacity, cfs RCHRES1 Conveyance for WH15 (Panther Lake RCHRES1) 650 RCHRES2 19th Ave. tightline MH 10-12 30 RCHRES3 19th Ave. tightline MH 5-10 120 RCHRES4 19th Ave. tightline MH 2-5 120 RCHRES5 19th Ave. tightline MH 1-2 160 RCHRES6 Channel from Sta 42+11 to 40+47 100 RCHRES7 Culvert from Sta 39+30 to 40+47 160 Channel from Sta 24+62 to 39+30 Culvert from Sta 23+00 to 24+62 RCHRES8 Channel from Sta 20+00 to 23+00 >500 RCHRES9 Channel from Sta 20+00.to 18+21 180 Culvert from Sta 17+12 to 18+21 CHRES10 Channel from Sta 17+12 to 11+04 >500 lv rt from Sta 9+47 to 11+04 RCHRES11 Channel from Sta 2+01 to 9+47 330 RCHRES12 Channel 1 and Culvert 1 (Panther Lake to Sta 2+01) >500 C,I RCHRES13 th Avenue Corridor 7 II�S- UW TCLGAW S' S- � C The hydrographs for each storm and land use condition were routed with HSPF using these stage-storage-discharge relationships for the thirteen elements. Table 7 lists the HSPF subbasins and the RCHRES receiving their flows, and Tables 8 lists the RCHRES under capacity with each hydrograph condition. Numbers placed in parentheses next to each RCHRES represent the additional capacity required to prevent overflow. The peak flows experienced in each RCHRES under each storm and land use condition are presented in the appendix. Dcccmbcr , _- 6-1/reportl.wpw . 31 __.._ ARY OF PEAK ROWS EXPERIENCED BY HSPF.RCH ES 25 Year 24 Hour Storm Peak flow rate.cfs RCHRES LU1 LU2 LU3 1 56 56 95 2 1.3 20 20 3 56 63 100 • 4 110 130 160 5 110 130 160 6 150 170 210 7 110 120 170 8 110 130 170 - 9 ' 110 130 170 10 140 160 190 11 140 150 190 12 140 150 190 13 0.38 52 52 100 Year 24 Hots Storm Peak flow rate,cfs RCHRES LW LU2 LU3 1 93 93 140 2 3.0 . 26 26 3 93 100 150 4 150 170 240 5 150 170 240 6 210 230 310 7 160 170 230 8 160 180 240 1E fl(w 00`(z 24 H.(2.-' 9 160 180 230ft-OVO S P'ot �� —l' 12 1990 210 260 14AAX = ZGO CfS S1/5-T ` 6.7 .7 1N4SEt ot ) V et V>A�SLO 1 100 Year 7 Day Storm Peak flow rate,cfs RCHRES LW LU2 LU3 1 94 90 120 2 1.2 13 13 . 3 95 100 140 4 150 160 200 5 150 160 200 6 190 200 250 7 160 170 220 8 160 170 220 9 160 170 220 10 180 200 240 11 180 200 240 12 180 200 240 • 13 0.39 3.2 3.2 Lt1I Land Use Condition 1: Entire basin at 1990 land use t� condition. IX2. Land Use Condition 2: School #6 developed and remainder of r basin at 1990 land use. Mori t CA44_, - L U 3 = Land Use Condition 1: School 16 developed and remainder of Ytd�• ,�,LI; oasin at future land use. 3L tt-,rt OVA ottt-Ic,(tot):1NO0141 9Y1tt NM 7111g5 oor LY,t'MI Mw MCI Q co ` ` 1 M-tt.It00 P. ` Z on , tote vY 111 A € n u 1I ) Q Q �. ° AVM N.v....MP <,tst 1 T. 'Oil'doom)OOYYd 0100 1 a• �d`n t is A a VM"OD 9NIN J\ MI TIIII Ism .. " c Y (� j au ,LV'Id AlIVNIEW117II.I A ((�)/{ Z2 :i WZ ,. j j zU€ : I 1 l ; z e11 EI ! Ii!lI12• — 3 � ig ii �E3�E l $i i i% : f f 1 • '. \ N h 1100 { ` 1. `� t a! \\\ U l'• .i , \�' \1 f°t ` na a °- Q Al "Ll ' �' )( . ,e6. ,(J -- / " ;,,,' ( i .` tip U` . , \ \ \,( .$1- ' ' �•�— • /' / ,- %1'' U): .I \\ -,$ ) /, / CC * i ir,s .o ' at� ' \' r W _ —� ff � ��— ! u/r:.. , _ ;; is 7 _ /// %\\C.1: , , f4`\l. ro I /; •'• �"I _ _- J /• / CI. rzi ;I vi :1�A i rry�� ,:a. z / . .3"-/ ''. .,..? 2, .,'„•'• o•, /.' ' \ \ ; 000 bbb Z �ss3� '✓ r �..' j /' ..4\ "." • to• • • ' ' ..i(1>, :- ;,." ,•••i,,,' ‘.‘ / 4 7 , '' Dig. `\\. . f- i, ' , r / 1744. O \ c '' r • E-0 \ y xw' f yyyp :_e_ ° S>5 • \ \ a a adz IB41g11 1RI 511 j r I r \ \ 4 13i hiIII 21 4 xb is 1 ! \ \ t. 0 g gal l.I°ePei ri t0t gd Ball r 1,41 • 1 vvj� Ra I,l I p%1 2 y�YAN aSr: . ,1 z W !PI ��i CPr; rI.0MIIsi B EI s i !IJd e4 �Pi; egl Ia7 l34 @ ! i ,11,0 33 PACIFIC ENGINEERING DESIGN INC. JOB GUEST 17/�-/- P4A7 , 93 CIVIL ENGINEERING AND PLANNING CONSULTANTS SHEET NQ T OF CALCULATED BY " - (�4y?��/'`--2--C DATE /A O/?-3 ........ . 4..... ... .... /v lG ....,iyil . a oM'K.f a� .D .4'uof 4 .,q4(7 r�7-� qy' . ......... .......... . T,,r4 c-. 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DO«vsTj164'ml S ST •3f- 130 ANDOVER PARK EAST, SUITE 300 SEATTLE, WASHINGTON 98188 (206) 431-7970 FAX:431-7975 3S 9/28/93 Pacific Engineering Company page 1 WEST HILL PLAT, 7TH AVENUE SW, FEDERAL WAY DRAINAGE BASIN PEAK RUNOFF MODELING USING 'WATERWORKS' HYDROLOGY SOFTWARE ----------------------------------------- BASIN SUMMARY BASIN ID: 100-7 NAME: DEV.SITE RUNOFF 1O0YR-7DAY ST SBUH METHODOLOGY TOTAL AREA 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE . . . . : KC7 PERVIOUS AREA PRECIPITATION. . . . : 10.10 inches AREA. . : 1 .33 Acres TIME INTERVAL . . . . : 60.00 min CN . . . . : 72 .70 TIME OF CONC 10,00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0 .61 Acres CN. . . . 96.30 PEAK RATE: 0.54 cfs VOL: 0 .99 Ac-ft TIME: 3300 min BASIN ID: 1O0D NAME: DEV. SITE RUNOFF 1O0YR STORM SBUH METHODOLOGY TOTAL AREA • 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE : USER1 PERVIOUS AREA PRECIPITATION : 4 .15 inches AREA. . : 1 .33 Acres TIME INTERVAL 10.00 min CN . . . . : 83 .60 TIME OF CONC 10.00 min IMPERVIOUS AREA ABSTRACTION COEFF: 0.20 AREA. . : 0.61 Acres CN. . . . : 98.00 PEAK RATE: 1 .41 cfs VOL: 0 .47 Ac-ft TIME: 480 min BASIN ID: 25DEV NAME: DEV. SITE RUNOFF 25YR STORM SBUH METHODOLOGY TOTAL AREA • 1 .94 Acres BASEFLOWS: 0.00 cfs RAINFALL TYPE. . . . : USER1 PERVIOUS AREA PRECIPITATION. . . . : 3.42 inches AREA. . : 1 .33 Acres TIME INTERVAL . . . . : 10.00 min CN. . . . : 83 .60 TIME OF CONC : 10.00 ruin IMPERVIOUS AREA ABSTRACTION COEFF: 0 .20 AREA. . : 0.61 Acres CN. . . . : 98.00 PEAK RATE: 1 .08 cfs VOL: 0 .37 Ac-ft TIME: 480 min BASIN RESULT SUMMARY BASIN VOLUME---- -RATE- ----TIME Hydrograph Area IO ---cf-- Ac-ft --cfs- -min- hours Methodology Acres 100-7 43194 0.99 0.54 3300 55.00 SBUH Method 1.94 1000 20603 0.47 1.41 480 8.00 SBUH Method 1.94 250EV 15941 0.37 1.08 480 8.00 SBUH Method 1.94 IC. 0 r+ IECEND Hyd Ho. 1_ Z.6 r?,-?A NR- s-co r 4l 7-400tr Hyd Ho. 2 too Kir.-2,4 Hit Vloctxt RJNoff ' o o oo 3 6 9 12 15 18 21 24 27 Tine in Hours Hyd No.: 1 Rate: 1.08 cfs Time: 8.00 hr Vol : 0.37 Ac-ft Int: 10.00 min Hyd No.: 2 Rate: 1.41 cfs Time: 8.00 hr Vol : 0.47 Ac-ft Int: 10.00 min 0 LEGEND Hyd No. 3_ 'Do ye. "I bibs 'S'TO�-M aO�l F. O yo m x N = 1 } 24 48 72 96 120 144 168 192 Tine in Hours Hyd No.: 3 Rate: 0.54 cfs Time: 55.00 hr Vol : 0.99 Ac-ft Int: 60.00 min KING COUNTY, SHINGTON, SURFACE ' ' ER DESIGN MANUAL TABLE 3.5.2B SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS SCS WESTERN WASHINGTON RUNOFF CURVE NUMBERS (Published by SCS in 1982) Runoff curve numbers for selected agricultural, suburban and urban land use for Type 1A rainfall distribution, 24-hour storm duration. CURVE NUMBERS BY HYDROLOGIC ROUP LAND USE DESCRIPTION AB CD Cultivated land(1): winter condition 86 91 94 95 Mountain open areas: low growing brush and grasslands 74 82 89 92 Meadow or pasture: 65 78 85 89 Wood or forest land: undisturbed or older second growth 42 64 76 81 Wood or forest land: young second growth or brush 55 72 81 86 Orchard: with cover crop 81 88 92 94 Open spaces, lawns, parks, golf courses, cemeteries, landscaping. good condition: grass cover on 75% or more of the area 68 80 86 90 fair condition: grass cover on 50% • to 75% of the area 77 85 90 92 Gravel roads and parking lots 76 85 89 91 Dirt roads and parking lots 72 82 87 89 Impervious surfaces, pavement, roofs, etc. 98 98 98 98 Open water bodies: lakes, wetlands, ponds, etc. 100 100 100 100 Single Family Residential (2) Dwelling Unit/Gross Acre % Impervious (3) 1.0 DU/GA 15 Separate curve number 1.5 DU/GA 20 shall be selected 2.0 DU/GA 25 for pervious and 2.5 DU/GA 30 impervious portion 3.0 DU/GA 34 of the site or basin 3.5 DU/GA 38 4.0 DU/GA 42 4.5 DU/GA 46 D A 48 6.0 DU GA 7.0 DU/GA 56 Planned unit developments, % impervious condominiums, apartments, must be computed commercial business and industrial areas. (1) For a more detailed description of agricultural land use curve numbers refer to National Engineering Handbook, Section 4, Hydrology, Chapter 9, August 1972. (2) Assumes roof and driveway runoff is directed into street/storm system. (3) The remaining pervious areas (lawn) are considered to be in good condition for these curve numbers. 3.5.2-3 11/92 5$ KING COUNTY, WA __ INGTON, SURFACE WAT DESIGN MANUAL FIGURE 3.5.1F 25-YEAR 24-HOUR ISOPLUVIALS '6% A ,,, 41 ,;w44.4 4 ,./A ,fdi it• ,,...„ :: ifeogritriarrelit - Nivi- tiveti ; i .. 1.II i IL"il 1111 I 704 d:# li ‘( -III I I illk:'*'.-4 _. 4 3./ i 4.2-) orol Alp, AmmilisA A ,, , 3. Itglikilibik J46;141); '. ,- I e , 3.3 .. ,s;—iliaritts14:10_1110 /7" itiphr 4 '- •Z5• \ - .06.____,, ‘1 -... ,..., 4, ...„1, i . . kl,„..1 „,,,- ,,..., 11.irt,‘„, , ,, ,, It • ,.(7/- \ 4111pft , - " 'I! 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"...--'k:k v , N ;.,.,..erkw./- \ ' '' .iiii rjAs‘r:——A.,,,,,...,\\..\ ir misioalw 8 , ' AL, 4 w...• ' , ,° 'i im.• . ----- g-i...wro r , , 7 ,.. . \li ligr \ _...,......) 5..0.0, �5-YEAR 24-HOUR PRECIPITATION �O` '. lAa �_.: `�•• S, tk . 0s3.4 ISOPLUVIALS OF 25-YEAR 24-HOUR �� I r 4 4 TOTAL PRECIPITATION IN INCHES op A_ - •S 0 1 2 3 4 5 6 7 8 Mlles 'J• �•/J Q ��f•.�µ 'c p� 3.5.1-11 03' 0�• • 1:300.000 - 1/90 51 KING COUNTY. WA ., HINGTON, SURFACE WAT — DESIGN MANUAL FIGURE 3.5.1H 100-YEAR 24-HOUR ISOPLUVIALS 3.1%.", 1131",4411k ok 4 7".4 •-_. '=1) i V< . I 3.4 .1� ,4ici 1 0,4 4, ) 10tite•' t It A ! iiiiiiibsom vi ahlit , ,', c \ i .;,- li.- 4;"644,10. 3.S 4.p/ ..- _ V gig k 171 giiigtairl eIli al 4. i '-- ...,k btlfill,„.144- 4FittevtimAINgfrim..,INtor, , .., 4 \I 45 01%-TON11 111V111"14011151116' \ lelIFIO‘urii44#3 f / 43 i '' - ' 1 OPTIe '111"VillOrgiSIMIr ' 14011iWN 'Vr ' i Ca:;;) —4-1,10110:14W1611.00/ .* . , , ...tlic i ligge "41h."%46°)Ve7441 1 "' 4.1 : -- ,,tibi'weggiisar- wo4Niir ita o' ri V .i Ai\ ‘,- ,--_,,. ..1,,,,,,4$0,„•(,........, •••4,' ‘ ., . 1(....--' , . _ t. ,.., \ N LiSinll ',IA', ‘,-4T040Viigmallillilek.-0,4: 1 S j� $11011/4) 4 , ,,,A.,511-vii Island ilk. (1/4(Si-r**46.6. � I�* ) 11 ,N* s /*".\ $ Alb , - -011w: ...(› :1-0,,,A. ---• -a) -1 )144,k -._..4 ,i,\ N4iir* _ -Aioniejviii- i. . t .__. • 411W,41.----10401 . . ' „- : - - v,,, \ 14,,,,,,, ././ ..4, • gellik.4 "sib %Ilk t „.. 0 1,1 'iltivi-IVIAxiimtAk \._ i \ ir,111 -, 1,11 ittr, 1,14 4, Nt1/41,,,,, , ‘ -- ,.,, 7,, / ____:. 14. • ..,......, _ ( iiii ------ 0. !PI' 1 4 III lit 1 t ii 1. 1"" °V ` Orkl *10111 Alt I 1 --- ; k.,. p!, 411:4p, .. ill , _, , i 1_,--iv: 211 toot i is ilir rbilipalitil.,110 „ A Tr. i , , , 'Wit= w , ..,. i .,. \\ / .-_\ as ye , , iii ' _ e .-... A itk � _ A4tt,!It 491 , p . . '. 1 lc . 1 .11f irptief ,0 . -* v, - . ,�i61 tw �/ �� `•efe,''`0-YEAR 24-HOUR PRECIPITATIONz. � � , 1 4 , ''a %,: :-.0- •0, : i 3.4^ISOPLUVIALS OF 100-YEAR 24-HOUR Dv ( ' - '•' TOTAL PRECIPITATION IN INCHES _� _ =- S-S 0 1 2 3 4 5 6 7 8 Mllos <0. w+., '; 3.5.1-13 OP O -. • t - 1:300,000 ' . 1/90 #0 KING COUNTY, SHINGTON, SURFACE W ? R DESIGN MANUAL FIGURE 3.5.1I 100-YEAR 7-DAY ISOPLUVIALS 4874 adriihr ---%4deilritifir ' v-,...... . 1 lir D" , .8liguilliViiri i la Att _ MAP!.4 9..4i\I R,'9 fri.e t1 l ���� ;� it ' y.1 1 N. \/' Li't4,7c,411l4l'4Iak.1i7N1i494t-1i0 4if 98 96ne .���‘ ��r 11. f h_.014 lilli i.$t 4twimr fre Vi .- pit -.�'.�A 1 , ( / .44114fr,,A,4/0 I - TMA \, qibeiffrii"-ele , - - Asi-ali ,_,- re:.' ( — 1141\ 1::41,1h4rdel mellitifrielliiiIII:M.,14AM : ''' '; 4° . ' \ -•••• 4,„ , Ntiliii :,,, - , • opailirvorwribil ci-iro, 7 c' 1 ' : f.` - 1 Tft4tAirly0113111.1 p;:.- _.i,. 40 1 , ' ,.zi:( • iir , ,, ,; it c " !, 1 ,, Island4 f �� ,00.,„,„,„,,„....... IA Illiteptill \ / . ,,me, i\s1/41\kiir, 400sImiers -4111111 , _-- -....._.„g,, Ntk\ \- - ' J - , .. ---v 41, .. _ r. r ' ":-.,. ......., ' ': -N‘ ' . „ ,.., It. CIA,. ; -- �.kki-- t � �A, � _ :� �-, y� 0:44:114001;6543_,... �► j SIM ., .. 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II« ; - k In `IB 2 Ce §{} 2 rs z kf1 k , /a - � . 0 A.• &a z . 2 . . • co . z , . z � | . } - | \ • U. I io en a • k co am sas, § ' . a. a 2 o CZ cc. -@ Cu' E Z. — @ -_ . £ V. 2 2 1 a k ex M Zw � kk §0 $ k -o .22zc b(0 E o k• — °in kcc - §� uv. . k &6 0. 0� 2.41 \ cc- -2 ' . ff�_ 7� % k C ©� • � �} / • . } �� \ \ § k 0 ° § 2 § }m �� k . k k z \ w ° k � k §} ( � . s) .43 2 2 ¢ ƒ § ■ 1.k2. - / k\ & f %f } f 7 2u a0- 2 k � � �� k \ \ § - }\] \ VI k H 2 \ e) f 7 } a 2 co • • | . ) a 2 « /o U § & § 2 A21Y15fD, lPf R CITY 5EV ' 15ED M55 MOD% f 5CCK WALLS, nDJU5TED LIMIT5 OF CLEnnItlG 9- Z5-95 LEL EX. SIDEWALK TO 13 5TORM C.O. A. SECTION 19, TWN* 21 N. RGE, 4 E. W.M.To REPLACED (TYP) KIM= 3174 0 INVt,,,=3I3-90 REMOVE SILT FENCING. 'LOT 3 5,0G'15UILDINI-i 60.00' WIDE TREE l - ��. � __. \\ ti `\ � 5ETBACK (TYP) RETENTION AREA. 10,-3 9 8 S.F. N IFILM010, � I OL H-11 N 93-40 SEE DETA I L# 1, C-3 PROJECT NO. ............. .. .... ... 1. CLEARED, DENUDED AREAS SHALL BE STABILIZED BY SEEDING OR DJW NOTE: 1115TALLATION Of CUR15 CUTS/ bKtVIfWQY MULCHING WITHIN 15 DAYS. DRAWN BY APRONS, 5ANITRRY SEWER, WRTER'll-ND 2. PROVIDE EXISTING CB'S WITH TEMPORARY EROSION PROTECTION DURING OTHER UTILITIES SERVICE515IDEWAEK CONSTRUCTION. INSTALL FILTER FABRIC OVER GRATE & FRAME TO REVISION DATE —08-94 PROTECT EXISTING CBS AND STORM SYSTEMS FROM DEBRIS & SEDIMENT. 6 REPLACEMENT AND STREET PAVEMENT 3. ONE MAILBOX STAND WITH FIVE RECEPTACLES (FOR LOT #I - LOT #5). ISSUE DATE OVERLAY ARE TO 5E.-COMI'LETED BY OTHERS \\ FEB 27 LOCATION AS DESIGNATED AND APPROVED BY THE U.S. POSTAL SERVICE, 95 AT TIME or bUILDIM4 CONSTRUCTION. R TWIN LAKE STATION. LETTER OF APPROVAL DATED 8/3/94. INSTALLATION 2-23-95 911-4HT-Of- WAY PERMIT WILL 51 REQUIRED a PER KCRS DRAWING NO. 24. H REVISION 4. PVC ADAPTER REQUIRED AT CB/MH'S. FOR THESE IMSTA*LLATIONS.. 5. PVC PIPE USED ON PRIVATE SYSTEMS ONLY. 6. COVER OVER PVC PIPE TO BE YMIN. AND 30'MAX. PERMIT NO. EARTHW(YRK 7. BACKFILL OVER PIPES AND UTILITIES IN RIGHT-OF-WAY TO BE 5/8" CRUSHED. CITY OF FEOERAL WAY CALCULATIONS: 8. PIPE/BUILDING SEPARATION PER TABLE 4.3.2A (KCSWDM). 9. DRAINAGE SYSTEM FOR FOOTING/ROOF DRAINS TO BE MAINTAINED BY A HOME OWNER'S ASSOCIATION OR OTHER ENTITY APPROVED BY THE CITY APPROVED OF FEDERAL WAY. 10. OVERLAY WORK SHALL INCLUDE GRINDING EXISTING PAVEMENT 60 WibE DATE APPROVED IFF -xxe)?Y! eb"" AND A44t'CLASS B ASPHALT PAVEMENT OVERLAY FROM CURB TO CENTERLINE q=AY. It -t-->4TEa D to - Lt -P)4 9 ESIGN N CIVIL ENGINEERINGn F=NGINEERING �y►,� ACIFI 00 00 00 rn Ld V) AND 7777:= PLANNING CONSULTANTS I we WEST LINE Of THE N.E. 1/4p 1 6 Of 515C. 19, T ?s I N., R. 4 E.. A \ �„� u U CL 4 1 4 N Apv N 5 v 0, Olb 0, V A Np 0, 01/ 4g' -`160.00' WIDE TREE RETENTION AREA 4 cp * JU < OIN14 41 !�x to qfTbFICK YPICAL) V ­7 tv 0 v t r x �A 4 V DUILDIN14--,, J k vrrPnry (TYPIOL) ` tip * +s rj° ? • 101" e4 X, m v "Sp 4z, 'Y' b A 11A T11, cir (OPE RPM�E) Ar T so DVIVOUX4ADW Mil 1h k 1 T V) 933 . rT. TOP OF MON.IN CASE EL.= 294.87, K.C.A.S.jDATUM. * LEGAL DESCPJPTION; Oi �4g fury V THE LAND REFERRED TO IN THIS COMMITMENT IS SITUATED IN THE STATE OF WASHINGTON, COUNTY OF KING AND IS DESCRIBED AS FOLLOWS: THAT PORTION OF THE NORTHWEST ONE QUARTER OF THE NORTHEAST ONE QUARTER OF SECTION 19, TOWNSHIP 21 NORTH, RANGE 4 EAST, W.M., IN KING COUNTY, WASHINGTON, SAID PORTION BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: COMMENCING AT THE NORTHWEST CORNER OF SAID SUBDIVISION; THENCE ALONG THE WEST LINE THEREOF SOUTH 01*11'40"WEST 1078.13 FEET; THENCE LEAVING SAID WEST LINE NORTH 52*58'44"EAST 78.28 FEET TO THE MOST NORTHERLY CORNER OF THE LANDS DESCRIBED IN DEED RECORDED UNDER RECORDING NO. 7412180379, RECORDS OF SAID OUNTY AND THE TRUE POINT OF BEGINNING; —THENCE NORTH 37001'16"WEST 2.00 FEET; THENCE NORTH 52058'44"EAST 112.82 CI:CT TA TITV. nVf11XTXTMTt1 AT A fNTT"A[T,' rlf'%MfNA%1� TTT�. A uNz7E1?qRqu1vD urlurm-s sHowly HEREON HAVE BEEN PwrrEv FROM A COMMNA770N OF FIELD LOCATED SURFACE FEATURES AND INFORAIA77CW FROM AS-sulLr DRAWINGS AS PROVIDED sr THE arr OF FEDERAL WAY. T-RI - ccuNrr LAND SURVEYING COMPANY ASSUMES NO REspaNsl&lury -rol? THE coRIFEcrIvEss OF THIS REcomq DATA. 11 "W741 Or SCALE: 1" 20' 0 i SIT9 DXfA 101\ :v INITY MAP 29 26 27 v 0 A- 7T V1 M 41 Zz SITE A o r BY:, 4-- DATE: 5CALC.'I zaij"� OWNEMEVELOPER: PARCO GROUP, LTD. 4303 N RUSTON WAY TACOMA, WA 99402 PHONE: 756-9921 SURVEYOR: TRI,COUNTY LAND SURVEYING CO. 1029 MARKET STREET SUITE A KIRKLAND, WA 98033 PHONE: 823-6939 ENGINEER: PACIFIC ENGINEERING DESIGN, ESIGN. INC. 130 ANDOVER PARK EAST SUITE 300 SEATTLE, WA 98188 (206) 431.7970 ACREAGE: :0.94 ACRES ZONING: RM 2.4 (MULTI -FAMILY) PROPOSED USE: SINGLE FAMILY PROPOSED NUMBER LOTS: 7 LOTS PROPOSED LOT SIZE: 7200 SF MIN (7256 AVG.) PROPOSED TOTAL OPEN SPACE: 0.774 AC - 39.9% (15% REqv) PROPOSED 'ACTIVE' OPENSPACF: 0.194 AC - 10.0% (10% IwQv) WATER SOURCE: FEDERAL WAY WATER & SEWER DIST. SEWAGE DISTRICT: FEDERAL WAY WATER & SEWER POWER SOURCE: PUGET SOUND POWER & LIGI-IT TELEPHONE: US WEST COMMUNICATIONS SCHOOL DISTRICT: FEDERAL WAY FIRE DISTRICT: KING COUNTY DISTRICT NO. 39 EXPIRES 8/4/14 ot u z 0 u O u 0 z w F-4 04 Z a0°'t,o 0 Z 'm LLI a c) 0 z 0 0 0 C.) a. qT CLx 0 93-40 PROJECT NO. DJW DRAWN SY 9-30-93 ,ISSUE DATE 1—io-q4 SHEET REVISION AN 11 1 -4 CIVIL ENGINEERING AND Avg% PLANNING CONSULTANT"%'ki t .. ,�',; i, .� a , .. a . ,, . s-A, � ,�{n .. - � �, Q --- - , : ;� 1�J �� �� -._ �-; � . y--. l _ , k 1 Gt.aa' MONUM .M