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Home My WebLink AboutPermit L92-0004 - KING COUNTY PARKS - SHORELINE SUBSTANTIAL DEVELOPMENTl92-0004 l92-0003 GREEN RIVER TRAIL A F F I D A V I T fl Notice of Public Hearing LI Notice of Public Meeting O Board of Adjustment Agenda Packet fl Board of Appeals Agenda Packet O Planning Commission Agenda Packet fl Short Subdivision Agenda Packet fl Notice of Application for Shoreline Management Permit fl Shoreline Management Permit - applicant (K.C. Parks Division) ,..U:S. Army Corp of Engr. U.S. Coast Guard Office of Archaeology Transportation Department fRon Cameron, City of Tukwila P.W. Name of Project Green River Trail File Number L92 -0004 all D I S T R I B U T I O N I, Dorothy Geving hereby declare that: Mitigated Determination of Nonsignificance 11 Determination of Significance and Scoping Notice Determination of Non - significance Notice of Action LI Official Notice 0 Other fl Other was mailed to each of the following addresses on January 27, 1993 . -Dept. of Natural Resources ,Dept. of Fisheries t.-Dept. of Ecology - SEPA ,dept. of Wildlife ►Metro udy Suchan, Shipiro & Assoc Signature John W. Rants, Mayor SUBJECT: Addendum to Determination of Nonsignificance for Phase I of the Green River Multi - Purpose Trail (L92 -0004) The DNS has been addended to include a second bridge to be located at Fort Dent Park upstream from the confluence of the Black and Duwamish Rivers (see maps attached). The bridge was identified as part of the project in the SEPA checklist, but was inadvertently omitted on the SEPA document under 'description of proposal'. If you have any questions pertaining to this project, Denni Shefrin can be reached at (206) 431 -3663. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 • Fax (206) 431-3665 DESCRIPTION OF PROPOSAL: CITY OF TUKWILA DETERMINATION OF NONSIGNIFICANCE (DNS) ADDENDUM TO L$2 - 0004 THE GREEN RIVER TRAIL, PHASE I, WOULD BE A 12 -FOOT WIDE MULTI - PURPOSE TRAIL. THE SOUTHERN LENGTH WOULD EXTEND FROM THE SOUTHERN BOUNDARY OF FORT DENT PARK TO ABOUT.200 FEET EAST OF THE INTERSEC- TION OF MALILE AVENUE SOUTH AND SOUTH 141ST PLACE. THE NORTHERN LENGTH WOULD EXTEND NORTH FROM JUST SOUTH OF THE 42ND AVENUE. SOUTH CROSSING OF THE DUWAMISSH RIVER TO THE SEATTLE CITY LIGHT SUBSTA- TION ON WEST MARGINAL PLACE SOUTH, INCLUDING 2 BRIDGES.: ONE ..LOCATED UPSTREAM FROM THE CONFLUENCE OF THE BLACK AND DUWAMISH RIVERS AT FORT DENT PARK AND THE SECOND WOULD BE A'PEDESTRIAN BRIDGE CROSS- ING THE DUWAMISH RIVER AT SOUTH 112TH STREET. SEE MAP'ATTACHED. THERE IS A 15 -DAY COMMENT PERIOD. PROPONENT: LOCATION OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY: ADDRESS: PARCEL NO:. SEC /TWN %RNG': 23,'24,14',10,9.,4 /23/4 LEAD AGENCY:: ' CITY OF TUKWILA FILE NO: L92 -0004 The City,has determined that the proposal'does not have a probable significant,. adverse impact on the environment.' An environmental impact statement (EIS) is not required Under . RCW 43.21c.030(2)(c). This decision -was made after review of a comPleted environmental checklist and other,in.formation on file with the agency. This ,, information is avai labie to the public on request. *• k*• k**k*****k***` k***' kk•k k k** kk***' ky* kkk• k* •k ****** **:**** * ** **k'kkk ****kk k**** This determination ' i's final and signed this _ day' 199. 41 10 . 'ick Beeler, Responsible Official City of Tukwila, (206) 431 -3630 6300 Southcenter Boulevard Tukwila, WA 98188 You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above signature date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Department of Community Development. SEATTLE TACOMA INTERNATIONAL AIRPORT 0 1/2 1 Mi. SHAPIRO & - ASSOIATES2 Green River Trail, Phase I FIGURE 1 SITE VICINITY MAP k GREEN RIVER TRAIL, PHASE I 1 . �� :;,;: .• •- � •;. _ - ... • • - Steep Slopes . Foster Golf ` Links - Vegetated ` ea Corridor River - Vegetated Corridor Proposed ri � " a Q\? . co ,� a'y P9 " P4' AVE. 5 6 AUt. INTERURB Ir AVE, m Fort Dent Park Access Bridge - Vegetated Corridor - Steep Slopes 0 200 400 800 Ft. SHAPIRO & ASSc IATESu LEGEND: 111 Green River Trail, Phase I -100 - Year Flood plain Sensitive Areas II FIGURE 2a NATURAL FEATURES MAP GREEN RIVER TRAIL, PHASE I • • ;'�'�'"�'� ;� 4mETRD Dear Ms. Shefrin: Sincerely, , Z4 1. :or■ MRD:ymg Enclosures 1 cc: S. Teel P. Miller MDTUKSHL Municipality of Metropolitan Seattle Exchange Building • 821 Second Ave. • Seattle, WA 98104 -1598 • (206) 684 -2100 September 9, 1992 Ms. Denni Shefrin City of Tukwila Dept of Community Development 6300 Southcenter Blvd. Tukwila, WA 98188 ... SUBJECT: Metro Interurban /SFT Force Mains and Trunk Shoreline Submission Enclosed is the Metro shoreline application for the three (3) areas where Metro's project is within 200 feet of the Green or Duwamish Rivers. This is a new submission and is not directly related to the Green River Bridge submission L92 -0003 from King County /Metro. Metro check No. 2653 in the amount of $550.00 also enclosed. As Metro was the lead agency the environmental check list fee of $225.00 is not tendered. I have provided a copy of Metro's April 1992 final SEPA for your convenience. If you have any questions please call me at 684 -1332. Marc R. lla SR /WA Right of Way Agent • • %ABUTMENT 1 EL 126.73 7.0. SLAB .� 1 100 PEAR FW --ice (F.E.h&&) Q 119.00 \1- 1I 11 U 11 0 SAT P TIP �i. s7.o�(Tly) ABLITMN T I X\V -WA1ER SURFACE —�•�' ON JUNE 11. 1991 EL 101_0O HDR Engineering. Inc. And Asaocfoled isms • ELEVATION ALE 1 - 10 S 221102 E PILE LAYOUT SCALE: 1' - 10• 0 F ( c) I o I qs si�!!SS11 ARCH 6RAONG . 0 ABRIDGE k 1RAS. FLOOR BEAMS - AIENEIL 169 -O 169 -0 PLAN SCALE 1 - 1O' LOCA110N OF OPTIONAL - .. 11E BEAM SPUCE EL 114.0* ABUTMENT 2 EL 120.73 T.O. SLAB -_ SECTION SCALE: M' - 1•-0• AIRIMILELEYAIICIN SCALE: 4w - ,• -0 . EL 12E73 EL 12. IIIIIIIIIIIIIilllllllllllllllllllllllllll II I�jllllllllllllllllllllllllllllli�l ..; T1�IIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIfIIIIIIIIII11111111111111111111111IIIIIiIIIIIIIIIII��I I 6 -0' STANDARD PR0.ECT FLOOD N a 120.14 7L1* — YIN OR (C.OE.) EL 120.90 6 -9 6 -9 6 -0 ( 6-4 _ APPRO)OLLATE EUOST. GRADE NOTE ALL ALES ARE 16N OCT. PRESTRESSED CONCRETE 1/471CATES DIRECTION OF 4 : 1 BATTER. E I U U -0 0 3 -0 %ABUTMENT 2 . . e l __ in '' i n I'll To F 0172 24.12 U 3 so. (7fF) 15111' OCT P/S • PIES (TIP) .- ABUTMENT AB(1TYENT SECTION WALE: 44 - 1 -0 a4iiiETRa Wooieip.UtT of WCropoUIe 3..W. MiS cso PRO.CCT AS Io/0) so m I4 TRA 9(IIRUR,LW PROTECT GREEN RIVER BRIDGE LAYOUT AA.? INS nna 40. we S203 DOT We Of N a. RENSION • MT DATE • HDR Engineering. Inc. And Amdoled firma • INTERURBAN AVE SOUTH CATHODIC PROTEC110N LOCATION MAP scA E: T' a Soo' Oa tsROL Ma ca/a�sa� �N� per V _t I ocDTIG LIB le V dr r 17 ET R 0 Yudoipalitr of Metropolitan S«wa MPG cSO PROJECT AS NO= SOUTHERN 1MNSFE NIERURllfN PROJECT CORROSION CCWAACI n PROTECTION DETAILS O V o-n: JULY INC ra NIA tna+c C22C bb H October 28, 1992 Re:. Green River Trail Dear Ms. Crumley: Sincerely, Denni Shefrin Associate Planner City of Tukwila Patricia L. Crumley Environmental Review Section Department of Ecology Mail Stop PV -11 Olympia, WA 98504 -8711 Please let me know if I can be of further assistance. cc: L92 -0004 Trudy Suchan, Shapiro and Associates :. � ' John W. Rants, Mayor Department of Community Development Rick Beeler, Director Thank you for responding to the DNS issued by the City of Tukwila for the above project. Your comments have been forwarded to Steve Massey of the King County Parks Division. The City of Tukwila requires that erosion control methods be employed in accordance with City and King County standards. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431.3665. October 22, 1992 Dear Mr. Beeler: PLC 6441 Rick Beeler City of Tukwila 6300 Southcenter Blvd. Tukwila WA 98188 Sincerely, Patricia L. Crumley Environmental Review Section cc: Ron Devitt, NWRO Janet Thompson -Lee, NWRO RECEIVED E.D STATE OF WASHINGTON 7 1�9`! DEPARTMENT OF ECOLOGY COMMUNITY _ DEVELOPMENT Mail Stop PV -11 • Olympia, Washington 98504 -8711 • (206) 459 -6000 Re: The Green River Trail, Phase I, construction of a 12 foot wide multi- purpose trail running 25 miles Thank you for the opportunity to comment on the determination of nonsignificance for the above referenced project. We reviewed the environmental checklist and have the following comments. 1. Because of the it's proximity to state waters, the project has a significant potential for affecting water quality during the construction phase. Erosion control at least equivalent to current King County Standards are necessary. 2. If grading and trail construction is accomplished during dry weather, water quality concerns would be reduced. If you have any questions regarding the Water Quality comments, please contact Ron Devitt in our Northwest Regional Office at 649 -7028. BARBARA GOODING Director Dear Mr. Beeler: Mr. Rick Beeler City of Tukwila 6300 Southcenter Boulevard Tukwila, WA 98188 STATE OF WASHINGTON Log: 101292 -19 -KI Re: Green River Trail DEPARTMENT OF COMMUNITY DEVELOPMENT OFFICE OF ARCHAEOLOGY AND HISTORIC PRESERVATION 111 21st Avenue S.W. • P.O. Box 43843 • Olympia, Washington 98504 -8343 • (206) 753 -4011 • SCAN 234 -4011 October 15, 1992 We have reviewed the materials forwarded to our office for the above referenced project. A search of our records, including the National and State Register of Historic Places and the Washington State Archaeological and Historic Sites Inventories, indicates the area has the potential for presently unrecorded archaeological resources. We recommend a professional cultural resources survey of the identified project impact area be conducted. Thank you for the opportunity to comment and please feel free to contact me at (206) 753 -4405, if you have any questions. RGW:lms Sincerely, \Mc Robert G. Whitlam, Ph.D. State Archaeologist RECEIVED OCT 1 61992 COMMUNITY DEVELOPMENT +� City of Tukwila Robert G. Whitlam, Ph.D. State Archaeologist • State Department of Community Development 111 21st Avenue S.W. Olympia, WA 98504 -8343 Re: Green River Trail (Log: 101292-19-KT) John W. Rants, Mayor Department of Community Development Rick Beeler, Director Thank you for responding to the DNS issued by the City of Tukwila for the above project. In your letter dated October 15, you recommended that a cultural resource survey be conducted for the above project. According to Steve Massey of the King County Parks Division, a cultural resources survey was prepared by Lee Lindsay and reviewed by your office this past June. Your follow -up letter to Steve stated that you concurred with the findings contained in the study. Please let me know if new information has become available related to cultural resources and this project or if I can be of further assistance. 6300 Southcenter Boulevard, Suite 11100 o Tukwila, Washington 98188 0 (206) 431 -3670 0 Fax (206) 431-3665 I Sylvia A. Osby A F F I D A V I T 0 Notice of Public Hearing 0 Notice of Public Meeting O Board of Adjustment Agenda Packet Board of Appeals Agenda Packet Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet 0 Notice of Application for Shoreline Management Permit fl Shoreline Management Permit was mailed to each of the following addresses on October 7, 1992 Appl;cao-4- (K. e. PMks A)E.17-1- . 05i Vuxlit` e.eSuw es ✓ US. -Actr4LA Carps oc- E ✓115. C.pasg r V l AtGl, ✓ a sPbr A-" 6 E pT: Name of Project GREEN RIVER TRAIL File Number L92 -0004 O F D I S T R I B U T I O N hereby declare that: Determination of Non - significance fl Mitigated Determination of Nonsignificance fl Determination of Significance and Scoping Notice fl Notice of Action 00f ficial Notice 0 Other 0 Other 1✓ pfi 51■A--rCe ✓ D“ off' Ecolt SSA / T oS 1.61 �� V M s \-y a Signatur Cv air DESCRIPTION OF PROPOSAL: CITY OF TUKWILA DETERMINATION OF NONSIGNIFICANCE (DNS) THE GREEN RIVER TRAIL, PHASE I, WOULD BE A 12 -FOOT WIDE MULTI- PURPOSE TRAIL.' THE:SOUTHERN LENGTH WOULD EXTEND FROM THE SOUTHERN BOUNDARY OF FORT DENT PARK TO ABOUT. 200 FEET EAST OF THE INTERSEC- TION OF MAULE AVENUE SOUTH AND SOUTH 141ST PLACE, THE NORTHERN LENGTH WOULD EXTEND NORTH FROM_JU'ST SOUTH OF THE'42ND AVENUE SOUTH CROSSING OF THE DLIWAMISH. THE SEATTLE CITY LIGHT SUBSTA- TION ON ,WEST MARGINAL PLACE SOUTH, INCLUDING A . PEDESTRIAN BRIDGE CROSSING THE DUWAMISH AT SOUTH 112TH ;STREET. SEE MAP ATTACHED. COMMENT' PERIOD I'S 15 DAYS FROM DATE OF DECISION. PROPONENT: COUNTRY PARKS DIVISION LOCATION;OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY: ADDRESS: PARCEL NOc: SEC /TW.N /.RNG: 23,24;14,10,9,4 /23/4 LEAD AGENCY: CITY OF' TUKWILA FILE NO: L92 -0004 The City; has.determined that the proposal ,does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21c.030(2)(c).. This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information` is; available to the public on request. ************ **** *k. ***k**** **** * ****** ** plc**** ************* * * * *******:4***k** This determination ;is final and signed this day 199.2. L. Rick Beeler, F sponsible Official City of Tukwila, (206) 431 -3680 6300 Southcenter Boulevard Tukwila, WA 98188 You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above signature date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Department of Community Development. S.. .,re l i ne Management Act of PERMIT FOR SHORELINE MANAGEMENT SUBSTANTIAL DEVELOPMENT File Number: L92 -0003 Status: APPROVED Applied: 01/16/1992 Approved: 10/02/1992 Expiration: 10/02/1994 Pursuant to RCW 90.58, a permit is hereby granted to: to undertake the following development GREEN RIVER TRAIL PHASE::.;I;; W OULD"BE' - A" 12- F WIDE MULTI-PURPOSE TRAIL '" THE .SOUTHERN LENGTH WOULD EXTEND FROM : ;1H.E "SOUTHERN ,BOUNDARY OF FORT DENT PARK TO ABUW2O0 .FEET EAST 'OF, THE INTERSEC- . TION OF MAULE.;;AVENUE SOUTHAND SOUTH 14'1'ST P'L'ACE'. THE NORTHERNfLENGTH WOULD` EXTEND NORTH FROM "JUST SOUTH OF THE;.42ND''AVENUE SOUTH CROSSING OF THE DUWAMISH RpvER;;TO THE SEATTLE •C :ITIL.I`GHT SUBSTA- TION ON WE%'T MARGINALPLACE SOUTH, `INCLUDING A PEDESTRIAN' BRIDGE CROSSING_!THE- DUWAMISH AT SOUTH 112TH STREET., upon the f: - `,,ollowing _Propertyc.., Address: 4 ' ,1? pw Parcel Sec /Twn /Rn 23,2404,.10 Date. THE PROPOSED PROJECT,WILL:BE WI AREA OF THE GREEN RIVER AND ITS", ASSOCIATED WETLANDS; WHICH ,I'S A .SHORELINE OF STATEWIDE SIGNIFICANCE AND ,I:S DESIGNATED AS AN - .URBAN ENVIRONMENT. The follpw'ing ;,'maste.r program provisions-:are, applicable to th is development: KING COUNTY SHORELINE PROGRAM AND TUKWhL:A°, SHORELINE PROGRAM Developmeit; pursuant to this permit shall following terms and con'ditions: This permit may be rescinded' p'ur su` ant;:; t;b:`:RG! permittee fails to comply with the or ✓Z ,02e!vr e under-ta pursuant the conditions �,..: This permit is ,gr t pursuant' to . , ; ; th,e Sharel ine Management A'ct of 1971 an nothing in this''p:er.,mit shall excuse the applicant from com'pl`iance with any other Federal, State, or local statu tes, ; or regulations applicable to this' but not. with ".the Shoreline Management Act(Chapter9 RCW) 1 0':58.140(8) in the event the hereof. CONSTRUCTION PURSUANT TO THIS PERMIT WILL NOT BEGIN OR IS NOT AUTHORIZED UNTIL THIRTY (30) DAYS FROM THE DATE OF FILING WITH THE DEPARTMENT OF ECOLOGY AS DEFINED IN RCW 90.58.140(6) AND WAC 173 -14 -090, OR UNTIL ALL REVIEW PROCEEDINGS INITIATED WITHIN THIRTY DAYS FROM THE DATE OF SUCH FILING HAVE TERMINATED; EXCEPT AS PROVIDED IN RCW 90.58.140(5)(a)(b)(c). Director, Plashing Department Construction or substantial progress toward construction must begin within two years from date of issuance, per WAC 173-14-0600 .SEATTLE TACOMA INTERNATIONAL AIRPORT River 0 1/2 1 Mi. SHAPIRO & ASSQEIATE32 Green River Trail, Phase I 7 FIGURE 1 SITE VICINITY MAP GREEN RIVER TRAIL, PHASE 1 City of Tukwila Department of Community Development September 29, 1992 Department of Ecology Environmental Review Section, MS PV-11 Olympia, WA 98504 RE: SEPA L92-0004, Green River Trail To Whom it Concerns: This DNS has been distributed to the following agencies: Washington State: 1. Department of Fisheries 2. Office of Archaeology and Historical Preservation 3. Department of Natural Resources 4. Department of Transportation Federal: 1. U.S. Army Corps of Engineers 2. U.S. Coast Guard Denni Shefrin Associate Planner , ....,,,,,,,,, . can be reached at 431-3663 if there are additional questions. Sincerely, John W. Rants, Mayor Rick Beeler, Director The purpose of this letter is to inform the Department of Ecology that the comment period has been extended. The reason for the extension is the original DNS had not been distributed for a 15-day comment period. 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431-3670 • Fax (206) 431-3665 A F F I D A V I T Sylvia A. Osby fl Notice of Public Hearing O Notice of Public Meeting O Board of Adjustment Agenda Packet O Board of Appeals Agenda Packet fl Planning Commission Agenda Packet 0 Short Subdivision Agenda Packet fl Notice of Application for Shoreline Management Permit 0 Shoreline Management Permit IMWEA .6 - D.O.E. Maz.1 rO 40;u1/4.)-\-- Name of Project GREEN RIVER TRAIL PHASE I Signatu File • Number L92 -0004 O F D I S T R I B U T I O N hereby declare that: @Determination of Non- significance fl Mitigated Determination of Nonsignificance O Determination of Significance and Scoping Notice O Notice of Action j Official Notice Other 13 Other was mailed to each of the following addresses on September 24, 1992 May 13, 1992 Sincerely, Trudy Suchan Project Manager Ms. Denni Shefrin City of Tukwila Dept. of Community Development 6300 Southcenter Boulevard Tukwila, WA 98188 SHAPIRO AND ASSOCIATES, INC. c: Mare Kern, MacLeod Reckord Steve Massey, King County Parks MAY 1 1992 CITY OF TUKWILA PLANNING DEPT. 21 Re: Green River Trail, Phase I Environmental Checklist Dear Ms. Shefrin: S A IRO & A 'S IArES The Smith Tower Suite 1400 506 Second Avenue Seattle Washington 98104 Tel: 206/624.9190 Fax: 206/624 • 1901 Enclosed is a copy of the letter granting the City of Tukwila lead agency s tus for the Green River Trail, Phase 1 environmental checklist. Also enclosed are a revised projec description and maps, in case you have time to review them before Friday's meeting. I look forward to seeing you and discussing the Green River Trail project t your offices at 2:00 Friday, May 15. King County • Parks Divioion Parke, Planning and Resources Department 2040 84th Avenue Southeast Mercer Island, Washington 98040 (20e) 296.4232 (206) 298-4341 Fax February 22, 1991• Mr. Rick Beeler Director, Community Development City of Tukwila 6200 Southcenter Boulevarc .__... Tukwi l RE: Green River Trail Phase I • Dear er: Sincerely, Steve Massey Project Administ for SM:id Enclosure • cc: Macleod / Reckord (with enclosure) Bob Jacobs, Chief, Capital Improvements and Planning Section h . 7 L. t ! OA -y L. / vi Rea King County Parks is in the preliminary design stages for the trail segments that will run from the turning basin to Fort Dent Park. The segments that are being designed are per the agreement between King County and Tukwila Parks Department signed on January 19, 1990 (attached for your information). Since most of these segments are inside Tukwila boundaries and most of the permits will have to come from Tukwila, we request that your agency assume the lead agency role for the SEPA requirements of this project. • Our consultant on this project is MacLeod /Reckord, who has as sub - consultant for permits the firm of Shapiro and Associates. If you have questions concerning this request or the project in general, call me at 296 -4254. DESCRIPTION OF PROPOSAL: 'L •iC"k Beeler, Responsible Official City of Tukwila, (206) 431-3680 6300 Southcenter Boulevard Tukwila, WA 98188 CITY OF TUKWILA DETERMINATION OF NONSIGNIFICANCE (DNS) THE GREEN RIVER TRAIL, PHASE I, WOULD BE A 12 -FOOT WIDE MULTI - PURPOSE TRAIL. THE SOUTHERN AND NORTH- ERN LENGTHS BEGIN AT THE SOUTH END OF FORT DENT PARK TO JUST SOUTH OF 42ND AVE SOUTH AND TOTAL APPROXIMATELY ,2.5:' MILES. . AN EXISTING TRAIL WOULD LINK THE SOUTHERN AND NORTHERN LENGTHS. THE PRO- JECT ALSO .INCLUDES A BRIDGE TO CROSS THE GREEN RIVER UPSTREAM FROM THE CONFLUENCE OF THE BLACK RIVER AND ';WOULD SUPPORT TWO SEWER FORCE MAINS AND ONE TREATED EFFLUENT LINE (SEE 22 JULY 1992 ADDENDUM AND VICINITY MAP.ATTACHED). PROPONENT: KING COUNTRY PARKS DIVISION LOCATION_ OF PROPOSAL, INCLUDING STREET ADDRESS, IF ANY ADDRESS: PARCEL NO: SEC /TWIN /RNG 23,24,14,10,9,4 /23/4 LEAD AGENCY:. CITY OF TUKWILA FILE NO L92 -0004 The City has determined that the proposal does not have a probable significant adverse impact on the environment. An environmental impact statement (EIS) is not required under RCW 43.21c.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. *************• k** k* ** * *•k** * *•k * * *•k *•k * * *** * * ** ** * * * * * **•k ** * * * ** * * *** *** * * **** This determination is final and signed this _ " ( day o 1992. You may appeal this determination to the City Clerk at City Hall, 6200 Southcenter Boulevard, Tukwila, WA 98188 no later than 10 days from the above signature date by written appeal stating the basis of the appeal for specific factual objections. You may be required to bear some of the expenses for an appeal. Copies of the procedures for SEPA appeals are available with the City Clerk and Department of Community Development. • SEATTLE TACOMA INTERNATIONAL AIRPORT River • Northern Portion 0 1/2 1 Mi. . SHAPIRO & - ASSaIATES2 Green River Trail, Phase I FIGURE 1 SITE VICINITY MAP GREEN RIVER TRAIL, PHASE I 1 Municipality of Metropolitan Seattle Exchange Building • 821 Second Ave. • Seattle, WA 98104 -1598 • (206) 684 -2100 September 21, 1992 Ms. Denni Shefrin City of Tukwila Department of Community Development . 6300 Southcenter Blvd. Tukwila, Washington 98188 Interurban Project /Bridge Crossing of the Green River Dear Ms. Shefrin; As you and I have discussed, the information contained in this packet is Metro's specific bridge design and is submitted as a supplement to the original King County Shoreline permits L 92 -0003 and L 92 -0004. A copy of the January 1992 King County Shoreline permit application is enclosed for your reference. Additionally, I have provided modified Green River Trail Phase I cover sheets which identify, by segments E, F and G, those areas touched by the bridge project. Various civil, landscape and structural plan pages are also included. These pages should provide excellent material for your review. process. A special set of landscape plan pages, with cover letter, is provided to identify trees by common name, species, and illustrates the project's probable impact on those trees. If you have any questions, please call me at 684 -1332. Sincerely, MD: f cc S. . Teel P. Miller encls. g:mdsftbdg `"VMarc R.11a , SR /WA Right of Way nt 4 RECE1VED SEP 2 21992 COMMUNITY DEVELOPMENT August 31, 1992 Dear Ms. Suchan: City of Tukwila John W. Rants, Mayor Department of Community Development Trudy Suchan Shapiro and Associates, Inc. Washington Mutual Tower, Suite 1700 1201 Third Avenue Seattle, WA 98101 RE: Green River Trail SEP - d I492 . HAPIRO AND ASSOC;.,;_,,, jdC. As a follow -up to our phone conversation today, the Planning Division has completed its review of the proposed trail project and has the following comments: 1. The size of the treat effluent line to run beneath the proposed Fort Dent Bridge must be 16- inches. The plans currently reflect a 12 -inch line. 2. Sheet L4, Segment D. There are five trees proposed for removal. Four of the five healthier trees should be saved and relocated rather than removed. New locations could be next to the benches to provide shade. 3. Sheet L5, Segment I. The trail would result in the removal of a 48 -inch Black Cottonwood (on the west portion). An effort should be made to preserve this tree. Is there a reason why the trail could not be shifted to the north? 4. Sheet L10, Segments R. It appears several trees would be impacted by the trail, however, it is unclear which trees would be removed. Many of the trees are significant (the Cherry and Ceder in particular) in size and every effort should be made to avoid impacts. Can the trail be shifted slightly south in order to preserve the Ceder and Cherry trees? Also, preserved trees should be tagged during construction. The City of Tukwila is in the process of developing a Tree Preservation Ordinance for the purpose of preserving trees deemed significant. The proposed ordinance further establishes priorities and goals for tree protection and provides standards for protection and replanting where removal is unavoidable. The trail will provide the much needed shoreline access for local and regional enjoyment. Every effort should therefore, be made to Rick Beeler, Director 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax: (206) 431-3665 Sincerely, Denni Shefri Associate Planner cc: L92 -0003 L92 -0004 Steve Massey Don Williams Gary Schulz preserve and enhance this amenity to the greatest extent possible. I would like to complete the draft Shoreline Management Permit and SEPA Determination (DNS) by September 11th. Your response to items 1 -4 above should be provided to me by September 8th. Feel free to contact me at 431 -3663 if you have further questions. August 31, 1992 City of Tukwila Trudy Suchan Shapiro and Associates, Inc. Washington Mutual Tower, Suite 1700 1201 Third Avenue Seattle, WA 98101 RE: Green River Trail Dear Ms. Suchan: John W. Rants, Mayor Department of Community Development Rick Beeler, Director As a follow -up to our phone conversation today, the Planning Division has completed its review of the proposed trail project and has the following comments: 1. The size of the treat effluent line to run beneath the proposed Fort Dent Bridge must be 16- inches. The plans currently reflect a 12 -inch line. 2. Sheet L4, Segment D. There are five trees proposed for removal. Four of the five healthier trees should be saved and relocated rather than removed. New locations could be next to the benches to provide shade. 3. Sheet L5, Segment I. The trail would result in the removal of a 48 -inch Black Cottonwood (on the west portion). An effort should be made to preserve this tree. Is there a reason why the trail could not be shifted to the north? 4. Sheet L10, Segments R. It appears several trees would be impacted by the trail, however, it is unclear which trees would be removed. Many of the trees are significant (the Cherry and Ceder in particular) in size and every effort should be made to avoid impacts. Can the trail be shifted slightly south in order to preserve the Ceder and Cherry trees? Also, preserved trees should be tagged during construction. The City of Tukwila is in the process of developing a Tree Preservation Ordinance for the purpose of preserving trees deemed significant. The proposed ordinance further establishes priorities and goals for tree protection and provides standards for protection and replanting where removal is unavoidable. The trail will provide the much needed shoreline access for local and regional enjoyment. Every effort should therefore, be made to 6300 Southcenter Boulevard, Suite #100 • Tukwila, Washington 98188 • (206) 431 -3670 • Fax (206) 431 -3665 , 0.; Sincerely, flAl& Denni Shefra. Associate Planner cc: L92-0003 L92-0004 Steve Massey Don Williams Gary Schulz rit; 'ettniMM;t: ..vram-rortathit,?:smoktms5t:V&I preserve and enhance this amenity to the greatest extent possible. I would like to complete the draft Shoreline Management Permit and SEPA Determination (DNS) by September llth. Your response to items 1-4 above should be provided to me by September 8th. Feel free to contact me at 431-3663 if you have further questions. s�F; ? ra July 21, 1992 Dear Ms. Shefrin: Sincerely, Ms. Denni Shefrin City of Tukwila Dept. of Community Development 6300 Southcenter Boulevard Tukwila, WA 98188 SHAPIRO AND ASSOCIATES, INC. Trudy Suchan Project Manager c: Mare Kern, MacLeod Reckord Steve Massey, King County Parks Re: Green River Trail, Phase I, Environmental Checklist .—:: A' cs :bn'r. ?:.•r.'LiTT , 'i£:SK t ,. Yt�Yu' '•t SHAPIRO& ASS@ TATESz Washington Mutual Tower Suite 1700 1201 Third Avenue Seattle Washington 98101 Tel: 206/624 • 9190 Fax: 206/624 • 1901 Enclosed is the requested Addendum to the SEPA Environmental Checklist for the Green River Trail, Phase I, originally submitted on January 15, 1992. Attached to it are the current Project Description and project maps. An update to the geotchnical report is enclosed as well. The shipping tube contains revised plan cover sheets with key to drawings. Segments S, T, U, V, X, and Y of the original plans are no longer part of King County's Phase I project. Please let me know how many, if any, copies of the design - development level plans you require. The information in the checklist addendum applies as well to the shoreline substantial development permit, submitted with the checklist on January 15, 1992. We hope this information is a useful addition to the environmental checklist you are currently reviewing. I will be out of the office the remainder of this week, but please call Monday if you require further information or if you have any questions. RECEIVED JUL 2 21992 COMMUNITY DEVELOPMENT RECEIVED CHECKLIST ADDENDUM TO THE GREEN RIVER TRAIL, PHA , 12 21992 SEPA ENVIRONMENTAL CHECKLIST SUBMITTED JANUARY 15, 1992 COMMUNITY DEVELOPMENT At the request of the City of Tukwila, SEPA lead agency, King County Parks Division is providing this addendum pertaining to Phase I of the Green River Trail. Portions of the trail, as described in the January 15, 1992 checklist, are no longer included in the proposed project. Design and schedule changes have occurred that affect the remaining portions of trail to be constructed by King County. Such changes have reduced the length of the proposed trail from 3.4 miles to about 2.5 miles. An updated Project Description and Figures 1, 2a, 2b, and 2c are attached. Fort Dent Park Bridge The bridge proposed to cross the Green River upstream from the confluence of the Black River would be constructed by the Municipality of Metropolitan Seattle (Metro) rather than King County. The bridge would be designed to support two 24 -inch sewer force mains and one 12- inch - diameter treated effluent line as well as provide the multipurpose trail crossing. Aspects of the bridge design that differ from that described in the checklist include deeper bridge trusses resulting in a bridge height about 19 feet above the base of the bridge, and larger diameter pilings or a greater number of pilings as required to support the additional use of the bridge. Development of the Metro bridge design is in progress. Further questions may be directed to Tim Goon, Environmental Planner, at 684 -1174. South 112th Street Interim Route At the request of the City of Tukwila, the Phase I trail route has been modified to avoid crossing the Pacific Highway South bridge. An interim route, described in the attached Project Description, would be developed by the City of Tukwila. As a result, the proposed tunnel on the east side of the bridge is deleted from the project and the small wetland (less than 50 square feet) located west of the bridge would not be filled. Impacts associated with the proposed tunnel and sidewalk extension on the west side of the Pacific Highway South bridge would no longer occur. Since no OID other wetlands would be affected by this project, all descriptions of wetland impacts in the 1 checklist can be disregarded. The proposed interim route would replace the length of trail originally designed to follow the south bank of the Duwamish River between East Marginal Way South and the Pacific Highway South bridge, then crossed the bridge, and followed the river north and east to the proposed South 112th Street bridge. The interim route would add one street crossing to the trail at Pacific Highway South and South 112th Street. The interim route would be identified by bicycle trail markings on the pavement and signs along the roads. Top -of -Bank Extensions The boardwalk supported by piers proposed for the top -of -bank extension near the Turning Basin has been redesigned to use geogrid reinforced walls supporting asphalt- surfaced trail. The change was made for reasons of economy and reduced environmental impact. Construction of the geogrid reinforced walls would affect a smaller area than the boardwalk and piers, require less excavation, and would not cause any disturbance below the 100 -year flood level. See the attached Project Description for further information. 1 July 21, 1992 Trees Removed and /or Replanted The number of existing trees to be removed and/or replanted has been reduced from about 40 to less than 25. In the area east of South 141st Place, three of the 17 large black cottonwoods on the east bank of the Duwamish River would be removed. South of the East Marginal Way South bridge, on the southern bank of the Duwamish River, a cluster of medium -sized cedar and locust trees would be thinned by 10 to 15 trees, with some trees at the perimeter of the cluster retained. If thinning did not occur, survival of some of the trees selected for removal would, over the long term, be doubtful because of the density of the cluster. Also because of the density of the cluster, success in relocating trees would be, uncertain, so it is not proposed. One or two large trees would be relocated within Fort Dent Park. , At'the :request of Fort Dent Park's maintenance. staff, a .few :medium- sized:trees would be removed from the park along the: maintenance road near :the proposed Foie Dent biidge:crossing. The number of newtrees to be planted the trail would be 139: Construction Schedule The revised project construction start date is January 4, 1993, with project completion by December 31, 1993. Construction of the proposed South 112th Street Bridge, Turning Basin walls, and drainage outfalls would be scheduled between May 15 and September 15, as recommended by the Washington State Department of Fisheries. Metro's construction of the proposed Fort Dent bridge would occur in 1993, but would be scheduled so as to avoid impacts on water quality and fish. 2 July 21, 1992 PROJECT DESIGN GREEN RIVER TRAIL, PHASE I PROJECT DESCRIPTION The Green River Trail is a proposed multipurpose trail that would run 25 miles through unincorporated King County and the cities of Auburn, Kent, and Tukwila. As described in the Green River Trail Master Plan (Jones & Jones, 1988), the trail would begin in Auburn Narrows Park at State Route 18 and continue north to the Duwamish River Turning Basin, just south of the Seattle city limits. The proposed trail alignment follows the banks of the Green and Duwamish Rivers as much as possible. Phase I, which would be developed by King County Parks Division, would be composed of two lengths of trail (Figure 1). The southern length would be roughly 0.9 miles long, extending from the southern boundary of Fort Dent Park to a point approximately 200 feet east of the intersection of Maule Avenue South and South 141st Place (Figure 2a). At this point, the southern length would connect with an existing asphalt trail that continues north along the Duwamish River. The northern length would be about 2.5 miles long, and would extend north from a point just south of the 42nd Avenue South crossing of the Duwamish River to the Seattle City Light substation on West Marginal Place South (Figures 2b and 2c). The northern and southern lengths of Phase I would be connected by a portion of the Green River Trail that is located entirely within Tukwila city limits. The City will be responsible for this portion of the trail, which is not included in the Phase I proposal. Phase I would be a combination of a multipurpose trail separated from roads and an interim bypass route following existing roads. The trail portion, designed for nonmotorized uses such as bicycling, walking, and jogging, would be a 12 -foot -wide asphalt path with a two -foot gravel shoulder on each side. The bypass portion would use existing roads: signs would be placed along the roadway indicating its shared use with bicycles. The route for the bypass portion of Phase I, approximately 0.4 miles long, has not been established at this time. For this reason, the bypass will be developed at a later time than the proposed multipurpose trail, under a separate contract. The bypass likely will follow East Marginal Way South between its crossing of the Duwamish River and its intersection with South 112th Street in the City of Tukwila. The bypass then would follow South 112th Street to its current terminus on the east bank of the river. At this point, the bypass would connect with the multipurpose trail portion of Phase I with a proposed new bridge over the river. The bridge, which would cross the city limits of Tukwila into unincorporated King County, would be designed for use by nonmotorized vehicles. Design would allow, however, for occasional use by maintenance vehicles, such as motorized sweepers. Phase I also proposes two underpasses in Tukwila, one at the west side of the 42nd Avenue South crossing of the Duwamish River and one on the south side of the East Marginal Way South river crossing. The underpasses also would be designed for use by nonmotorized vehicles. GREEN RIVER TRAIL, PHASE I 1 JULY 1992 Trail Features Bridges The proposed bridges would be steel truss superstructures on reinforced concrete foundations. Design for the bridge across the Green River, above the confluence of the Black River, is still under consideration. At this time, it is anticipated that the bridge would be a simply - supported superstructure with a 130 -foot main span and two 30 -foot approach spans. The bridge would be designed and constructed by the Municipality of Metropolitan Seattle (Metro) to carry two 24 -inch sewage force mains and one 12- inch - diameter treated effluent line below the trail surface. The proposed South 112th Street bridge would be a steel truss superstructure on reinforced concrete foundations. The proposed design is a simply - supported superstructure with one 170 - foot and one 55 -foot span. Each span would be nine feet deep with ten feet clearance between handrails. The spans would be supported by a pier consisting of twin 24 -inch diameter columns founded on rock with a two -foot -deep capping beam. Bridge abutments, which would be located outside the FEMA floodway, would consist of 18- inch - diameter piles founded on rock and capped with a bank seat stem wall to carry the superstructure. Underpasses The underpass at the 42nd Avenue South bridge would be partially cut into the riverbank and partially placed on compacted fill material. Fill material would be placed on the riverbank as foundation for the east approach to the underpass. Riprap would be placed along the waterward edge of the trail pavement for about 55 feet on the eastern approach. The riprap would extend down to the toe of the proposed fill material. Cut faces in the riverbank would be braced by a cast -in -place reinforced concrete wall located landward of the trail. This wall would extend 215 feet through the interior of the underpass and beyond the width of the overlying roadway. The surface of the trail through the underpass would be cement concrete. Interior vertical clearance would be a minimum of nine feet. The underpass at the East Marginal Way South bridge would be partially cut into the riverbank and partially placed on compacted fill material. Fill placed to support the approaches to the underpass would be held in place by geogrid reinforced walls located waterward of the trail. These walls would extend 60 feet along the east approach and 36 feet along the west approach to the underpass. Riprap would be placed along their length down the slope to the limit of disturbance. Fill placed to support the trail within the underpass would also be held in place by a geogrid reinforced wall located waterward of the trail. This wall would rest on the existing bridge substructure and would extend 60 feet through the interior of the underpass. Riprap also would be placed at the base of this wall. Cut areas of the riverbank would be sloped back at a 2:1 maximum slope, precluding the need for any walls landward of the trail. The surface of the trail through the underpass would be cement concrete. Interior vertical clearance would be a minimum of nine feet. Walls at Turning Basin At the Duwamish River Turning Basin (Figure 2c), geogrid reinforced walls with handrails would be constructed along portions of the existing West Marginal Place South roadway embankment. The walls, which would have a maximum height of 6.5 feet, would be backfilled to create a bench for the asphalt- surfaced trail. The base of the walls, which would be a minimum of one foot above the FEMA floodway, would be riprapped where the existing bank was disturbed by construction. GREEN RIVER TRAIL, PHASE I 2 JULY 1992 Table 1: VOLUME AND LINEAL EXTENT OF PROPOSED ROCK BANK REINFORCEMENT Location South 112th Street Bridge - west riverbank riprap 280 60 - east riverbank riprap 360 60 Underpasses - 42nd Avenue South riprap 60 55 - Fast Marginal Way South riprap 25 150 Turning Basin Walls - riprap 45 560 Stormwater Outfalls - quarry spall drainage aprons TOTAL Source: MacLeod Reckord, 1992. Rock Bank Reinforcement Approximately 1,075 cubic yards of rock reinforcement would be placed along 969 lineal feet of the banks of the Duwamish and Green Rivers as a result of trail construction. The rock includes riprap and quarry spalls. In addition, two or three large boulders would be placed at the toe of each riprapped riverbank at the proposed South 112th Street bridge, along with vegetative debris such as anchored tree stumps, to provide fish habitat. Table 1 summarizes the volume and linear extent of rock reinforcement for each proposed improvement. Interpretive Stations and Public Art Installations Three interpretive stations and four public art installations would be placed along the Phase 1 alignment. The proposed interpretive stations would be based on the themes "Flora and Fauna," "River Morphology," and "Native American History/Archaeology." Each station would include an approach walk and viewing area paved with crushed -rock, an interpretive sign made of porcelain enamel on an eight -inch concrete post, one or two benches, and landscaping. GREEN RIVER TRAIL, PHASE I Volume Lineal Extent (cubic yards) (feet) 45 54 815 939 3 JULY 1992 • Four "1% for Art" installations would be sited along or near the alignment. The commissioned pieces include Susan Point's six Cedar Spirit Planks, which may be placed along the trail adjacent to the Boeing Customer Service building; Roger Fernandes' three Granite Petroglyphs, two of which would be placed in the vicinity of the Spirit Planks and one of which would be placed on the west approach to the proposed South 112th Street bridge ; Caroline Orr and Jon Gierlich's four Benches with a Basket - Design Back, placed at the east approach to the proposed South 112th Street bridge; and Jaune Quick -to -See Smith's Fishing Wheel and Canoe Rack, which would be adjacent to the trail within Fort Dent Park. PROJECT CONSTRUCTION Construction Schedule Construction of Phase I is scheduled to occur over a 12 -month period beginning in January 1993. Construction of the proposed bridge over the Duwamish River and other features of the trail that would directly affect the streambank, including the proposed underpasses, would be scheduled to take place entirely within a window of time that would result in the least impact on fish in the stream. Guidance from the Washington Department of Fisheries indicates that this window would be between May 15 and September 15. Construction Activities General Activities Construction activities would include clearing surface vegetation and grading soils. Although the acquired right -of -way (ROW) varies between 16 and 125 feet along the trail alignment, at no time would an area larger than 26 feet be cleared. In general, only the 16 -foot width required for the trail would be graded; in some areas additional ditch grading would be performed immediately adjacent to the 16 -foot corridor. Construction vehicles would travel along the cleared area only, and would be stored either along the cleared portion of the alignment or in a separate staging area. Excavated and excess graded soils would be stored on site. Cut and fill would be balanced, if possible, along typical paved portions of the trail. Where reinforced walls are proposed along the Duwamish River Turning Basin, imported fill could be required. Stockpiled excavated soils and imported fill material would be covered with appropriate erosion - control material, as necessary, to prevent erosion and sedimentation. Imported materials, including gravel to be used as the trail base, would be stored on site. Typical paving along the alignment would be two-inch Class B asphalt concrete on a four -inch base of 5/8- inch -minus crushed rock. Wherever the trail is at an elevation below the 100 -year flood level, an additional six -inch sub -base of 1.5- inch -minus crushed rock would be placed below the four -inch base. Concrete paving would be 4- inch -thick cement concrete on a 6 -inch base of 5/8- inch -minus crushed rock. An expanded environmental checklist, prepared under the State Environmental Policy Act (SEPA), provides further information on general construction activities, anticipated impacts, and proposed mitigation measures. GREEN RIVER TRAIL, PHASE I 4 JULY 1992 Bridge Construction Activities The large span for the proposed bridge would be delivered by truck in three sections. These sections would be bolted together at the site. Both spans would be lifted in place by one or more cranes located on the shore. No construction equipment would be placed in the river. Piles would be auger cast by a drill rig. The single pier for the bridge would be within Tukwila jurisdiction. Because this pier is located well waterward of the eastern riverbank, some falsework (such as a timber pile - supported boardwalk) may have to be constructed on the eastern bank to allow a drill rig access to the location of the pier. Surface Restoration All.cleared surfaces would be hydroseeded or otherwise treated as soon as possible following construction. A planting plan would be implemented to restore areas adjacent to the trail that were disturbed during construction and to provide long -term erosion control. Areas landward of the streambanks would be seeded and permanent vegetation would be planted. Bioengineering treatments, such as planting willow cuttings in riprap, would be applied to portions of the streambank affected by proposed bridge abutments and the underpasses. Where the trail is very near the streambank, vegetation would be planted to provide streambank protection. The trail has been designed to avoid, as much as possible, large individual trees and stands of trees. Tree replacement would be at a ratio of two -to -one, with replacement trees being of a similar species and at least 2.5 -inch caliper in size. The SEPA checklist prepared for this proposal provides further information about impacts on existing vegetation and proposed surface restoration mitigation measures. GREEN RIVER TRAIL, PHASE I 5 JULY 1992 River •• - Northern Portion Green River Trail, Phase I 0 1/2 1 ML "' Bypass - by Others SHAPIRO & ASS3EIATES2 FIGURE 1 SITE VICINITY MAP GREEN RIVER TRAIL, PHASE I SHAPIRO& ASSQEIATESX .,l7 f; o. . w is5 - Steep Slopes Foster Golf Links fllver - Vegetated Corridor - Steep Slopes Vegetated Corridor Q (Proposed Fort Dent Pedestrian Bridge - by Others) /WE Fort Dont Park Access Bridge 0 200 400 600 Ft. LEGEND: 1111111 ^z t Green River Trail, Phase 1 100 - Year Flood Plain Sensitive Areas FIGURE 2a NATURAL FEATURES MAP GREEN RIVER TRAIL, PHASE I s2 • • KING COUNTY - Steep Slope - Erosion - Vegetated Corridor - Vegetated Corridor - Steep Slope Proposed Underpass - Vegetated Corridor - Steep Slope fiktiYn: id/Fl•. SHAPIRO & - ASSQEIATES2 gG, 0 200 400 600 Ft. ua k Tf LEG ND: Green River Trail, Phase I ••Trail Bypass - by Others Sensitive Areas FIGURE 2b NATURAL FEATURES MAP GREEN RIVER TRAIL, PI IASE I 1 - ASSC E I IAT ESE - Class 1 River - Steep Slope W MARGINAL PL. S 0 200 400 1300 Ft. votoit .4g.01 .d: LEGEND: ••••••• YYrsM`.'ss Green River Trail, Phase 1 Trail Bypass - by Others Sensitive Areas - Steep Slope ,' 7th. 7∎ Proposed Bridge KING COUNTY FIGURE 2c NATURAL FEATURES MAP GREEN RIVER TRAIL, PHASE I green river trail phase i environmental Checklist shapiro and associates GREEN RIVER TRAIL, PHASE I ENVIRONMENTAL CHECKLIST Prepared for. King County Parks, Planning, and Resources Department Parks Division Prepared by: Shapiro and Associates, Inc. 506 Second Avenue, Suite 1400 Seattle, Washington 98104 Green River Trail, Phase I . L � V 1 1 6 1992 CITY OF TUKWILA PLANNING D PT. Control No. Epic File No. 1 .— U ' Fee $225.00 Receipt No. 'S < I Li' ENVIRONMENTAL CHECKLIST A. BACKGROUND 1. Name of proposed project, if applicable: Green River Trail, Phase I. 2. Name of applicant: King County Parks Division. 3. Address and phone number of applicant and contact person: King County Parks Division 8040 84th S.E. Mercer Island, WA 98040 (206) 296 -4254 Steve Massey, Project Manager 4. Date checklist prepared: January 15, 1992 5. Agency requesting checklist: City of Tukwila, Department of Community Development 6. Proposed timing or schedule (including phasing, if applicable): Construction of Phase I is anticipated to begin in June 1992. The schedule of subsequent phases is not yet known. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. This proposal is for Phase I of a trail that will be developed in several phases. Phase I comprises approximately 3.4 miles of the proposed 25- mile Green River Trail. Subsequent phases will undergo independent environmental review. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. • Green River Trail Master Plan. King County, Division of Natural Resources and Parks, 1988. 1 • Cultural Resource Survey of the Green River Bicycle Trail. BOAS Inc., 1990. • Sensitive Areas Reconnaissance for Green River Trail, Phase I. Shapiro and Associates, Inc., 1991. • Geotechnical Investigation Final Report, Green River Trail Project. King County, Tukwila, Seattle, Washington. Hong West and Associates, 1991. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None are known. 10. List any governmental approvals or permits that will be needed for your proposal, if known. City of Tukwila: Shoreline Management Shoreline Substantial Development Permit Land Alteration Permit King County: Shoreline Substantial Development Permit Commercial Building Permit Clearing and Grading Permit Critical Area Sensitive Areas Ordinance Review Washington State: Department of Fisheries, Hydraulic Project Approval Department of Ecology, Water Quality Certification/Modification Office of Archaeology and Historical Preservation, Archaeological Approval Department of Natural Resources, Easement for Right -of -Way Department of Ecology, National Pollution Discharge Elimination System, Stormwater General Permit Department of Transportation General Permit (may include Utilities and Transportation Commission approval) Federal: Green River Trail, Phase I U.S. Army Corps of Engineers, Section 404 Permit U.S. Coast Guard, Section 9 Bridge Permit 2 11. Give brief, complete description of your proposal, including the 'proposed uses and the size of the project and site. There are several questions later in. this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) The Green River Trail is a proposed major multipurpose trail that would run 25 miles through unincorporated King County and the cities of Auburn, Kent, and Tukwila. As described in the Green River Trail Master Plan (Jones & Jones, 1988), the trail would begin in Auburn Narrows Park at State Route 18 and travel north to the Duwamish River Turning Basin, just south of the Seattle corporate limits, following the banks of the Green and Duwamish Rivers as much as possible. Phase I, which is comprised of two lengths of trail, would be developed by King County Parks Division (the Applicant) (Figure 1). The southern length would be roughly 0.9 miles long, extending from the southern boundary of Fort Dent Park to a point approximately 200 feet east of the intersection of Maule Avenue South and South 141st Place (Figure 2a). At this point, the southern length would connect with an existing asphalt trail that continues north along the Duwamish River. The northern length of Phase I would be about 2.5 miles long, and would extend north from a point just south of the 42nd Avenue South crossing of the Duwamish River to the Seattle City Light substation on West Marginal Place South (Figures 2b and 2c). The portion of the Green River Trail that would connect the northern and southern lengths of Phase I is located entirely within Tukwila corporate limits. The City will be responsible for this portion of the overall trail, which is not included in the Phase I proposal. Phase I would be a multipurpose trail separated from roads, designed for nonmotorized uses such as bicycling, walking, and jogging. Most of the trail would be asphalt, 12 feet wide, with a two -foot gravel shoulder on each side. Two new bridges over the Duwamish and Green Rivers, two underpasses, and one tunnel are proposed as part of the trail. One bridge would be located upstream from the confluence of the Black and Duwamish Rivers (see Figure 2a), and the other would be located at South 112th Street (see Figure 2c). The underpasses would be located on the west side of the 42nd Avenue South bridge and the south side of the East Marginal Way South bridge (see Figure 2b). The tunnel would be constructed on the south side of the Pacific Highway South bridge (see Figure 2b). The bridges, underpasses, and tunnel would be designed for use by nonmotorized vehicles, allowing for occasional use by maintenance vehicles such as motorized sweepers. The Applicant has committed to certain mitigation measures for impacts anticipated to result from project implementation. These measures will be incorporated into project design and construction documents. A summary of the measures, discussed in greater detail in Section B of this checklist, is provided below, according to the element of the environment to which they relate. Green River Trail. Phase I 3 River • Nir---1-North•rn • Portion • t Allentown SEATTLE TACOMA INTERNATIONAL AIRPORT 1/2 1 Mi. SHAPIRO & - ASSQEIATES2 Green River Trail, Phase I FIGURE 1 SITE VICINITY MAP GREEN RIVER TRAIL, PHASE I ; ASSCIE I IA ES Foster Golf Links Vegetated Corridor Q v 114 ERURBAN Proposed Bridge m AVE. Fort Dent Park Access Bridge - Vegetated Corridor - Steep Slopes 0 200 400 1300 Ft. LEGEND: 1111111 Green River Trail, Phase I 100 - Year Flood Plain Sensitive Areas FIGURE 2a NATURAL FEATURES MAP GREEN RIVER TRAIL, PHASE 1 •o / TUKWILA - Unclassified Drainage - Wetland - Steep Slope • Erosion - Vegetated Corridor - Vegetated Corridor - Steep Slope - Vegetated Corridor - Steep Slope KING COUNTY Proposed Tunnel 0 200 400 600 Ft. SHAPIRO & - ASSQEIA ES LEGEND: Green River Trail, Phase I Sensitive Areas 24, Proposed Underpass • - Vegetated Corridor - Steep Slope FIGURE 2b NATURAL FEATURES MAP GREEN RIVER TRAIL, PHASE I ... - Steep Slope - Drainage (culvert under H►vy. 99) - Wetland - Steep Slope - Bank Erasion - Class 1 River - Steep Slope - Steep Slope - Area of Recent Bank Protection W MARGINAL PL. S 0 200 400 600 Ft. LEGEND: Green River Trail, Phase 1 Sensitive Areas P Q. TUKWILA Proposed Tunnel KING COUNTY FIGURE 2c NATURAL FEATURES MAP .. GREEN RIVER TRAIL, PHASE I EARTH The Applicant will follow the guidelines and specifications of the King County Surface Water Design Manual in designing erosion control measures for the entire Phase I trail. An Erosion/Sedimentation Control Plan (ESCP) will be developed as part of the final design process. The ESCP will include measures for minimizing exposed areas during construction and for protecting adjacent streams from erosion impacts. Erosion control measures will include: • Installing filter fabric fences downslope of cleared areas, and covering exposed areas with appropriate erosion control material, where necessary. • Immediately stabilizing, with plastic sheeting, erosion control blankets, hydroseeding, or mulch, areas cleared of vegetation, as necessary. • Placing stockpiled soil away from surface water, and covering stockpiles with appropriate material such as plastic sheets or mulch. • Preserving existing vegetation wherever possible. The Applicant will prepare a planting plan as part of the final design. Long- term erosion control measures in the plan will include seeding and planting permanent vegetation on all areas cleared as a result of construction on the alluvial plain and streambanks, as appropriate. Bioengineering treatments, such as planting willow cuttings in riprap, will be applied to portions of the streambank affected by proposed bridge abutments, underpasses, and the tunnel. The proposed trail will be designed to avoid, as much as possible, those areas with features indicating ground instability. In many locations along the alluvial plain, preliminary designs place the trail as if the adjacent riverbanks sloped at a ratio of 2:1, or 50 %, where applicable and possible. By assuming a 2:1 slope, the trail is placed further away from the existing streambank, which thereby reduces the potential for erosion impacts on the banks and on the trail. Where the riverbank would be disturbed by construction of bridges, underpasses, and the tunnel, long -term bank stabilization measures will be developed in consultation with the King County Building and Land Development Division (BALD) and the City of Tukwila. AIR Proposed measures to control emissions of dust, carbon monoxide, and particulate matter during construction will be included in contract specifications. Since the completed project would not be a source of long- term emissions or odor, no long -term mitigation would be necessary. Proposed short -term measures include: • Spraying areas of exposed soils with water to reduce dust. • Washing and brushing truck wheels and undercarriages, if necessary. • Cleaning of all affected roadways. • Limiting idling of construction vehicles. • Minimizing traffic delays to the extent possible. Green River Trail, Phase I 8 WATER The ESCP developed for the project will include measures for minimizing exposed areas during construction and for protecting adjacent streams from erosion impacts. Measures to reduce or control surface -water runoff and stormwater impacts resulting from the project include: During Construction • Filter fabric fences will be constructed downslope of cleared areas to reduce downstream sedimentation, where necessary. • Construction equipment will avoid drainages and the top of the riverbank and will use designated travel routes. • Excavated soils will be stockpiled away from surface -water features and wetlands, and will be covered with appropriate material, such as plastic sheeting, to prevent erosion and sedimentation. • Existing vegetative cover will be maintained to the greatest extent possible. • Existing stormwater management facilities along the alignment will be protected. • Construction within the Green and Duwamish Rivers will take place during the summer, when weather conditions are drier, runoff and sedimentation from storms is reduced, and river levels are lower. After Construction , include: • Preserving existing vegetation wherever possible. • Revegetating disturbed portions of the site with permanent trees, shrubs, and ground covers. Green River Trail, Phase I 9 • Hydroseeding or otherwise treating all cleared surfaces as soon as possible after construction. • Limiting construction equipment access to existing roads and designated areas to reduce damage to existing vegetation. • Implementing erosion and sedimentation control measures, such as covering exposed soil surfaces with mulch or plastic sheeting, as necessary during construction to minimize impacts on vegetated corridors, other existing vegetation, and the Green and Duwamish Rivers. ANIMALS The Applicant will prepare a planting plan as part of the final design process, which will include those areas impacted by construction of bridges, underpasses, and the tunnel. Habitats disturbed during project construction will be replanted. Proposed mitigation measures beneficial for wildlife include: • Revegetating disturbed areas; in some locations, replanting would improve fish and wildlife habitat within the project area. • Maintaining snags and perch trees within the project vicinity wherever possible. Large black cottonwoods along the west bank of the Duwamish River east of 141st Place, which provide the best perch sites within the project vicinity, will be maintained wherever possible. Of the 17 black cottonwoods in this area, only two to four would be removed. Every effort will be made in the design process to preserve as many trees as possible while ensuring the safety of trail users. • Scheduling construction within the Green and Duwamish Rivers for the summer months to avoid the most crucial time of year for salmon migration. • Implementing erosion and sedimentation control measures, such as covering exposed soil surfaces with mulch or plastic sheeting, as necessary during construction to minimize impacts on vegetated corridors, other existing vegetation, and the Green and Duwamish Rivers. Such measures would reduce further degradation of fish and wildlife habitat. ENERGY The completed project is not anticipated to have any energy impacts; therefore, no mitigation measures are necessary. ENVIRONMENTAL HEALTH • Staging and fueling areas for construction equipment will be designed and sited to minimize potential damage and risks of fuel spill. • Staging areas will be located away from residences, the river, and sensitive drainages. Measures to mitigate possible noise impacts during construction include: • Limiting construction activity to between 7 a.m. and 5 p.m. as much as possible. Some night construction of the bridges and tunnel may be required for traffic management purposes. Green River Trail, Phase I 10 • Reducing idling time by turning off construction equipment during prolonged periods of inactivity. • Notifying affected residents and businesses of the construction schedule in advance. Measures to mitigate possible noise impacts after construction include: • Limiting operation of maintenance equipment to between 7 a.m. and 5 p.m., except for emergency maintenance. LAND AND SHORELINE USE The project would comply with applicable land and shoreline use regulations. No adverse impacts on land and shoreline use are anticipated; therefore, no mitigation measures are necessary. HOUSING No impacts on housing are anticipated; therefore, no mitigation measures are necessary. AESTHETICS Light fixtures, interpretive signs, and other trail- related improvements will be designed to be unobtrusive. LIGHT AND GLARE Construction will be limited to daylight hours for most of the trail, precluding the need for artificial lighting during most construction periods. Construction of the tunnel and underpasses may require night construction_ to avoid traffic disruption. Lighting for the trail would be designed and installed to minimize potential impacts, including light spillover into adjacent residential areas. No other light or glare impacts are anticipated; therefore, no further mitigation measures are necessary. RECREATION No adverse impacts on recreation are anticipated; therefore, no mitigation measures are proposed or necessary. The proposed project would not displace any existing recreational uses of the project area, and would enhance recreational opportunities as both a recreation destination and as a connection between other recreational opportunities in the area. HISTORIC AND CULTURAL PRESERVATION No known historic, cultural, or archaeological resources exist in the project alignment. Should artifacts be uncovered during construction, work would be stopped and the appropriate authorities notified. Interpretive signage will identify historic features visible from the trail. Four "1% for Art" installations, selected for their native cultural history themes, will be sited along the trail. Green River Trail, Phase I 11 C ^ 'i�' U�� v.� ...: s. �f: G'"".': c:: t: t` �? Y'. 7�5. �z+:. �'::s.3:(,Y'!n "r.Wvs:.zc�t..,.. TRANSPORTATION PUBLIC SERVICES UTILITIES During construction, traffic delays will be minimized to the extent possible; naggers will facilitate traffic flow as necessary. No long -term impacts on transportation are anticipated; therefore, no further mitigation measures are necessary. For the safety of trail users, lighting will be provided on the extension to the Pacific Highway South bridge, and in underpasses and the tunnel. Trail design will be consistent with accepted trail safety standards. Installation of removable bollards or master -keyed gates would allow emergency vehicles access to the trail, if needed. No significant impacts on other public services are anticipated; therefore, no additional mitigation measures are necessary. The trail will be designed to minimize the need for relocating utilities. Current design indicates that some power poles and fire hydrants will need to be relocated. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While you should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. Figure 1 shows the location of Phase I of the proposed trail: Phase I is located entirely within King County and the City of Tukwila. The southern terminus is in Section 23 and the northern .terminus is in Section 4 of Township 23 North, Range 4 East, Willamette Meridian. Green River Trail, Phase I 12 TAD BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY B . ENVIRONMENTAL ELEMENTS 1. EARTH a. General description of the site (circle one): flat, rolling, hilly, steep slopes, mountainous, other. The proposed multipurpose trail extends on the flat -lying alluvial plain adjacent to the Green and Duwamish Rivers. A variety of land covers are found on the alluvial plain along the proposed trail alignment, including industrial and residential buildings and streets, scattered trees, dense shrubs, grasslands, and bare ground. Very steep to nearly vertical slopes exist along the riverbanks. The banks slope approximately 6 to 25 feet down to the rivers' edge. Dense, shrubby vegetation covers most of the riverbanks, although some locations are bare because of slope erosion, river scouring, or sheer steepness. b. What is the steepest slope on the site (approximate percent slope)? The steepest slopes in the project vicinity occur along the riverbanks which, in many locations, are almost vertical. In general, the trail will be located as far away from the riverbank as possible (see 1.h., below). Adjacent to the riverbank, on the alluvial plain, the slopes are almost level and range from 0 to 3 %. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any prime farmland. The southern portion of the trail, extending from the southern boundary of Fort Dent Park to the intersection of South 141st Place and Maule Avenue South, has been inventoried by the Soil Conservation Service (SCS) in the Soil Survey of King County Area, Washington. The portion located north of Fort Dent Park lies on "urban land" (USDA, 1973). "Urban land" is a category describing soil that has been modified by disturbance of the natural layers with additions of fill material, usually several feet thick. Within Fort Dent Park, soils are mapped as Newberg silt loam. The U.S. Department of Agriculture (USDA) Land Use Classification System rates the suitability of soils for agricultural use. Newberg silt loam is rated Capability Unit II- , w. This classification is given to soils that have moderate limitations for agricultural use because of wetness that interferes with plant growth or cultivation. When artificially drained or when planted later in the growing season, after the soil has dried out, the Newberg series is considered the best soil type in the county for row crops. This soil type is identified as prime agricultural soil in King County (USDA, 1991). The northern portion of the proposed trail alignment, extending between the 42nd Avenue South bridge and the Seattle City Light substation, was not mapped by the SCS. Most of this area is heavily urbanized. Field investigations of this portion of the proposed trail alignment indicate that Green River Trail, Phase I 13 TO BE COMPLETED EVALUATION FOR BY APPLICANT soils consist of fill material and alluvially deposited loamy sands, sandy loams, silt loams, and silty clay loams. The results of soil borings taken along the proposed alignment are provided in Geotechnical Investigation, Final Report, prepared by Hong West and Associates (1991). d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. Surface indications of unstable soils are present in several areas along the Green and Duwamish Rivers. At unvegetated bends in the river, the banks . show evidence of stream cutting caused by high water levels. On the east bank of the Duwamish River between South 112th Street and Pacific Highway South, in the vicinity of the Boeing Customer Service building, extreme streambank erosion has been curtailed recently by installation of riprap (see Figure 2c). In January 1991, small fissures observed on the top of the bank in this location indicated bank instability, and that future bank failures were likely. Because the alluvial plain lacks steep slopes, its soils have no slippage potential. e . Describe the purpose, type, and approximate quantities of any filling or grading proposed. Indicate source of fill. Filling and grading activities would take place along some portions of the alignment during construction of the multipurpose trail. The intent would be to balance cut and fill. In this case, no other source of fill would be required. f . Could erosion occur as a result of clearing, construction, or use? If so, generally describe. In the flat -to- gently sloped areas along the proposed alignment, the trail corridor would be cleared of vegetation and graded, to a width of 20 to 26 feet. Construction would pose a slight erosion hazard until the trail surface and shoulders are complete and adjacent vegetative cover is reestablished. Where bridge abutments, underpasses, and the tunnel are proposed, excavation and stockpiling of soils would present a greater potential for erosion. Erosion potential would be greatest along sections of the alignment directly adjacent to the riverbank. Surface -water runoff would be controlled during construction and would continue until vegetation is reestablished to prevent rill and gully erosion down the face of these banks. g . About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? The right -of -way (ROW) width varies between 16 and 125 feet along the trail alignment. Within the ROW, 12 feet would be asphalt trail. On average, this impervious area would be about 17% of the 3.4 -mile ROW corridor. AGENCY USE ONLY Green River Trail, Phase I 14 TO BE COMPLETED BY APPLICANT h . Proposed measures to reduce or control erosion, or other impacts on the earth, if any: The Applicant will follow the guidelines and specifications of the King County Surface Water Design Manual (King County, 1990c) in designing short- and long -term erosion control measures along the entire length of the Phase I trail. An Erosion/Sedimentation Control Plan (ESCP) will be developed as part of the design process. The ESCP will include measures for minimizing exposed areas during construction and for protecting adjacent streams from erosion impacts. Short -term erosion control measures will include: • Filter fabric fences will be installed downslope of cleared areas, and exposed areas will be covered with appropriate erosion - prevention material, where necessary. The filter fabric fences will be constructed and maintained in a manner to ensure that sediment -laden runoff does not enter the river or violate applicable water standards. • Areas cleared of vegetation will be immediately stabilized with plastic sheeting, erosion control blankets, or by hydroseeding or mulching, as necessary. • Areas of stockpiled soil will be placed away from surface -water features and will be covered with appropriate material, such as plastic sheeting or mulch, to prevent erosion and sedimentation. • Existing vegetation will be preserved wherever possible. The Applicant will prepare a planting plan as part of final design. Long- term erosion control measures in the plan will include seeding and planting permanent vegetation on all areas on the alluvial plain and streambanks that were cleared during construction, as appropriate. Bioengineering treatments, such as planting willow cuttings in riprap, will be applied to portions of the streambank affected by proposed bridge abutments, underpasses, and the tunnel. The proposed trail will be designed to avoid, as much as possible, those areas with features indicating ground instability. In many locations along the alluvial plain, preliminary designs place the trail as if the adjacent riverbanks sloped at a ratio of 2:1, or 50 %, where applicable and possible. By assuming a 2:1 slope, the trail is placed further away from the existing streambank, which thereby reduces the potential for erosion impacts on the banks and on the trail. Where the riverbank would be disturbed by construction of bridges, underpasses, and the tunnel, long -term bank stabilization measures will be developed in consultation with the King County Building and Land Development Division (BALD) and the City of Tukwila. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 15 10 BE COMPLE 1 ED EVALUATION FOR BY APPLICANT AGENCY USE ONLY 2. AIR a. What types of emissions to the air would result from the proposal (i.e., dust, automobile, odors, industrial wood smoke) during construction and when the project is completed? If any, generally describe and give approximate quantities if known. Sources of emissions from the completed project would be limited to cars using the access parks and occasional maintenance vehicles servicing the trail and park facilities. Emissions would be negligible, especially when compared with the levels generated by adjacent traffic. During construction, there would be a temporary increase in dust, suspended particulates, carbon monoxide, and other emissions from construction equipment and surfacing materials, and from potential traffic delays caused by construction. Emissions would occur where earth moving and hauling take place, and along hauling and access routes used by construction vehicles. Quantities of emissions would be minimal and would be expected to disperse rapidly. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. Portions of the proposed trail are located near or adjacent to major roadways, where vehicles are a source of emissions and odors. In the vicinity of Allentown, the trail parallels East Marginal Way South/Interurban Avenue South, a secondary arterial. From the South 112th Street bridge north to the Turning Basin, portions of the trail parallel Highway 99/599, a freeway (see Figures 2a, b, and c). c . Proposed measures to reduce or control emissions or other impacts on air, if any: Proposed measures to control emissions of dust, carbon monoxide, and particulate matter during construction include: • Spraying areas of exposed soils with water to reduce dust. • Washing and brushing truck wheels and undercarriages, if necessary. • Cleaning all affected roadways. • Limiting idling of construction vehicles. • Minimizing traffic delays to the extent possible. Flaggers would facilitate traffic flow, as necessary. Since the completed project would not be a source of long -teen emissions or odor, no long -term mitigation would be necessary. Green River Trail, Phase I 16 ID BE COMPLE1bD BY APPLICANT 3. WATER a. Surface: (1) Is there any surface water body on or in the immediate vicinity of the site (including year -round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. Phase I of the proposed trail extends along the Green and Duwamish Rivers. The main branch is considered the Duwamish River upstream to the confluence of the Duwamish and Black Rivers. Upstream from this point, the main branch is considered the Green River. The Black River and one small drainage act as tributaries to the Duwamish River along the proposed trail alignment. At the northern boundary of Fort Dent Park, the Black and Green Rivers converge to form the Duwamish River (see Figure 2a). A side drainage channel to the Duwamish River is located about 1,850 feet south of the Seattle City Light substation (see Figure 2b or 2c). A culvert carries water eastward under Highway 99 and West Marginal Place South, and empties into the Duwamish River at this location (see Figure 2c). One wetland is located along the proposed alignment (see Figure 2c). This wetland is a small emergent wetland less than 50 square feet in size. It is an isolated depressional area approximately 100 feet west of the Pacific Highway South bridge, and is bordered by the Duwamish River to the north and east, Pacific Highway South to the south, and an on/off ramp for Highway 99 to the west. (2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. Most of the trail alignment would be located within 200 feet of the above - described water features. The proposed trail would be located adjacent to the main channel of the Green and Duwamish Rivers, above and parallel to the riverbanks. The trail would not cross the Black River, but would cross the side drainage channel to the Duwamish River near the Seattle City Light substation. The trail would include construction of two bridges for non - motorized traffic (with the exception of maintenance vehicles), one across the Green River upstream from the confluence of the Black River (see Figure 2a) and the other across the Duwamish River at the southern end of 27th Avenue South and South 112th Street (see Figure 2c). Underpasses are proposed for the west side of the 42nd Avenue South bridge and the south side of the East Marginal Way South bridge (see Figure 2b). In addition, the trail would cross the Duwamish River by extending an existing sidewalk on the west side of the Pacific Highway South bridge, passing through a proposed tunnel on the east side of the bridge to gain access. It is likely that the small wetland (less than 50 square feet) located west of the Pacific Highway South bridge would be affected by trail construction (see Section B.4.a for further information). Green River Trail, Phase I 17 EVALUATION FOR AGENCY USE ONLY TO BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY (3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. No material would be dredged from surface waters (the Green and Duwamish Rivers) or wetland areas. Riprap will be placed along streambanks adjacent to bridge abutments and underpass approach ramps. Construction of the bridge approach to the Pacific Highway South crossing of the Duwamish River would fill most of the small emergent wetland (less than 50 square feet) located approximately 100 feet west of the bridge. Fill in the wetland and vicinity would be comprised of material graded from adjacent areas and bedding (four- inch -deep gravel) and surfacing (two -inch- deep asphalt) for the trail. (4) Will the proposal require surface -water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. It is not anticipated that surface -water withdrawals or diversions would be necessary. • (5) Does the proposal lie within a 100 -year floodplain? If so, note location on the site plan. According to flood insurance rate maps, portions of the proposed trail lie within a 100 -year floodplain (FEMA, 1989). In the southern portion of the proposed trail route, flood hazard areas exist along most of the proposed route (see Figure 2a). A floodway exists along the upper banks of the river channel. In addition, two areas along the proposed trail alignment lie within the 100 -year floodplain. The first area encompasses the entire Fort Dent Park area, with the exception of a building foundation in the central portion of the park and a narrow band of land along the southern end of the park, upslope of the levee. The second floodplain area is east of South 141st Place between the Duwamish River and South 143rd Street. In the northern portion of the trail, between the 42nd Avenue South bridge and the Seattle City Light substation, flood hazard areas (the 100 -year floodplain and floodway) are limited to the upper banks of the Duwamish River channel. Along this stretch, the river appears to have been channelized; this channelization likely reduced and/or eliminated areas that •once functioned as floodplain. The proposed trail would not lie within the 100 -year floodplain along this northern portion. (6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. The project would not involve discharge of waste material into surface waters. Green River Trail, Phase I 18 10 BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY b. Ground: (1) Will groundwater be withdrawn, or will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. The project would not involve withdrawal of, or discharge to, groundwater. (2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: domestic sewage; industrial, containing the following chemicals...; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are . expected to serve. The proposed trail would not result in any waste discharge into groundwater. c . Water Runoff (including stormwater): (1) Describe the source of runoff (including stormwater) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Stormwater runoff from the impervious surface of the multipurpose trail would flow onto the trail's gravel shoulder. The trail is designed with a 2% cross slope; runoff would be diagonal. Some runoff water will percolate through the shoulder into soils below. In some areas, grass -lined drainage ditches and culverts will be constructed adjacent to the gravel shoulder to provide for stormwater collection and conveyance to surface waters (the Green and Duwamish Rivers). (2) Could waste materials enter ground or surface waters? If so, generally describe. The proposed project would not result in any waste discharge into ground or surface waters. A short-term increase in erosion and sedimentation could occur from the clearing, excavating, and grading activities associated with project construction. d. Proposed measures to reduce or control surface, ground, and runoff water impacts, if any. The Applicant will follow the guidelines .and specifications of the King County Surface Water Design Manual in designing erosion control measures. An Erosion/Sedimentation Control Plan (ESCP) will be developed as part of the final design process. The ESCP will include measures for minimizing exposed areas during construction and for protecting adjacent streams from erosion impacts. Measures to reduce or control surface -water runoff and stormwater impacts resulting from the project include: Green River Trail, Phase I 19 TAD BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY During Construction • Filter fabric fences will be constructed downslope of cleared areas to reduce downstream sedimentation, where necessary. • Construction equipment will avoid drainages and the top of the riverbank, and will use designated travel routes. • If excavated soils (e.g., reserved topsoil) or fill material must be stockpiled, these materials will be placed away from surface -water features and wetlands, and will be covered with appropriate material, such as plastic sheeting, to prevent erosion and sedimentation. • Existing vegetative cover will be maintained to the greatest extent possible. • Existing stormwater management facilities along the alignment will be protected. • Construction within or over the Green and Duwamish Rivers will take place during the summer, when weather conditions are drier, runoff and sedimentation from storms is reduced, and river levels are lower. After Construction • The trail is designed with a 2% cross slope and two- foot -wide gravel shoulders. Stormwater runoff from the impervious surface of the trail would flow diagonally across the shoulders, where it would percolate through the gravel into the soil below. In some areas, grass -lined drainage ditches and culverts adjacent to the gravel shoulder will provide stormwater collection and conveyance to surface waters (the Green and Duwamish Rivers). • Outfall protection and riprap will be installed at all culvert discharges. • A planting plan will be prepared as part of the final design. As part of the plan, areas cleared during construction will be seeded or planted with permanent vegetation. 4. PLANTS a. - Check or circle types of vegetation found on the site: X deciduous tree: alder, maple, aspen, other: see below X evergreen tree: fir, cedar, pine, other: see below X shrubs X grass pasture crop or grain X wet soil plants: cattail, buttercup, bulrush, skunk cabbage, other: see below water plants: water lily, eelgrass, milfoil, other other types of vegetation ' Green River Trail, Phase I 20 TO BE COMPLETED BY APPLICANT Wetlands The majority of the proposed trail would be built on existing gravel paths, along roadsides, and within maintained power line rights -of -way. Portions of the trail would be constructed in undeveloped, vegetated areas along the Green and Duwamish Rivers. One wetland and a variety of upland habitats are found in the project area. These habitat types are described in greater detail in the following discussion. A small emergent wetland, less than 50 square feet in size, is located in a depressional area near the Duwamish River, approximately 100 feet west of the Pacific Highway South bridge (see Figure 2c). This localized depressional area is bordered by Pacific Highway South to the south, the Duwamish River to the north and east, and an on/off ramp of Highway 99 to the west. The wetland is dominated by reed canarygrass (Phalaris arundinacea) and characterized by mottled sandy loam soils and saturated conditions within six inches of the soil surface. Although reed canarygrass extends to the Duwamish River, non -hydric soils and an absence of wetland hydrology are found closer to the river. This small, low - quality wetland depression receives runoff from the surrounding roads and hillside. Uplands Undisturbed upland habitat types within the project area include deciduous forest and shrubland. Vacant lots, parkland, residential and urban developments, and the Seattle City Light power line right -of -way cover the majority of the project area. These habitats tend to be dominated by grasses, introduced weedy herbaceous plants such as dandelion (Taraxacum officinale), and plantain (Plantago spp.). In residential areas and office parks, ornamental shrubs and trees are common. Shrubland within the project area is typically dominated by Himalayan and evergreen blackberry (Rubus laciniatus), and exists primarily along the riverbank and in vacant lots. Deciduous forest occurs in isolated stretches along the Duwamish and Green Rivers within the project area. These areas are identified as "vegetated corridors" on Figures 2a, b, and c. Within the southern boundary of Fort Dent Park, along the eastern banks of the Green River, a vegetated corridor lies between an existing dike and the river (see Figure 2a). The corridor begins approximately 400 feet west of the Fort Dent Park access bridge and extends about 200 feet northward around the river bend. This community is characterized by big -leaf maple (Acer macrophyllum), red alder (Alnus rubra), and black cottonwood (Populus trichocarpa) in the overstory, and Himalayan blackberry and willow (Salix sp.) in the understory. Another vegetated corridor in this portion of the trail alignment extends downstream about 1,400 feet from the proposed site of the first trail bridge, along the west side of the Duwamish River. This vegetated corridor is composed of Himalayan blackberry, snowberry (Symphoricarpos albus), red alder, willow, and red -osier dogwood (Corpus stolonifera). Within this community, black cottonwoods occur either alone or in clusters along the EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 21 10 BE COMPLETED EVALUATION FOR BY APPLICANT banks of the river, but not within the trail alignment. A corridor of large black cottonwoods, about three- to four -feet diameter at breast height (dbh), continues along the vegetated corridor northward about 300 feet along the west bank of the Duwamish River, ending east of the intersection of South 141st Place and Maule Avenue South (see Figure 2a). This remnant patch of large cottonwoods is the most significant vegetation within the Phase I project alignment because of the relative size of its trees and its proximity to the Duwamish River. Large, old cottonwoods are rare on the southern stretch of the Duwamish and Green Rivers. Trees of this stature provide perching sites for a variety of wildlife, including bald eagles that perch and feed in the area. In the northern portion of the proposed alignment, a vegetated corridor extends along the western riverbank for roughly 2,300 feet from the 42nd Avenue South bridge to the southern end of residential developments in Allentown (see Figure 2b). The canopy is predominantly composed of big - leaf maple and red alder; Oregon ash (Fraxinus latifolia) is present, but not a common member of the canopy. Understory species in this community •include swordfern (Polystichum munitum), snowberry, salmonberry (Rubus spectabilis), and Himalayan blackberry. South of the East Marginal Way South bridge, another vegetated corridor extends downstream along the western bank for roughly 200 feet (see Figure 2b). A black cottonwood, a poplar (Populus sp.), and a big -leaf maple, all larger than three -feet dbh, occur within the proposed alignment along the riverbank. Farther inland from the river, a wooded area contains several ornamental cedars (Chamaecyparis sp., Calocedrus sp., Juniperus sp.) and black locust (Robinia pseudo- acacia). b. What kind and amount of vegetation will be removed or altered? A corridor about 16 feet wide would be cleared for the trail (a 12- foot -wide paved path with a two -foot gravel shoulder on each side). In some areas, an additional four to ten feet adjacent to the corridor would be cleared for construction. The majority of the trail is on the edge of existing roads, through developed areas, and along maintained rights -of -way. Several of the vegetated corridors would be cleared and graded. Within these areas, approximately ten, 10- to 12 -inch dbh trees would be relocated, and about five, 24- to 36 -inch trees and about 25 smaller- diameter trees • would be removed. Trees to be relocated include beech (Fagaceae) and Norway maple (Ater platanoides); trees to be removed include Norway maple and black cottonwood. The greatest impacts on vegetation would occur in the southern portion of the project area along the west bank of the Duwamish River, east of the intersection of South 141st Place and Maule Avenue South, and in the northern portion of the alignment, south of the East Marginal Way South bridge. In the area east of South 141st Place, two to four of the 17 large black cottonwoods on the west bank of the Duwamish River would be AGENCY USE ONLY Green River Trail, Phase I 22 TO BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY removed. Because of the importance of this remnant stand of cottonwoods, every effort has been made to preserve it by minimizing the number of trees removed or affected (refer to 5d., below). South of the East Marginal Way South bridge, on the southern bank of the Duwamish River, a cluster of smaller cedar and locust would be removed. A five -foot dbh big -leaf maple located closer to the riverbank would be avoided. It is anticipated that the small (less than 50 square feet) isolated, emergent wetland just north of the Pacific Highway South bridge would be filled. No further impacts on vegetation are anticipated under the proposed trail design. Refer to the design development packet for more detailed information. c . List threatened or endangered species known to be on or near the site. The Washington Natural Heritage Program and the U.S. Fish and Wildlife Service (USFWS) maintain records of sensitive, threatened, and endangered plant species occurring in the state. These agencies were contacted and indicated they did not have any information in their data bases concerning the presence of listed or proposed sensitive, threatened, or endangered plant species in the project area (Cyra, 1991; Frederick, 1991). No sensitive, threatened, or endangered plant species were observed, on the site during field investigations in January 1991, and on the basis of the habitat types present in the site vicinity, none are expected. d . Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: The Applicant will prepare a planting plan as part of the final design process. City of Tukwila guidelines will be followed for relocation or replacement of trees within the city limits. Replacement will be at a ratio of two -to -one, with replacement trees being of a similar species and of at least 2.5 -inch caliper. Current design indicates that about 35 trees of 2.5 -inch caliper will be planted. In addition, 150 smaller trees will be planted along the alignment as part of landscape design. Bioengineering techniques will be used for riverbank areas affected by construction of bridges, underpasses, and the tunnel. Other measures to preserve or enhance vegetation on the site include: • Existing vegetation will be preserved wherever possible. • Disturbed portions of the site will be revegetated with permanent trees, shrubs, and ground covers. • All cleared surfaces will be hydroseeded or otherwise treated as soon as possible after construction. Green River Trail, Phase I 23 TO BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY • Construction equipment will be limited to existing roads and designated areas to reduce damage to existing vegetation. • Erosion and sedimentation control measures, such as covering exposed soil surfaces with mulch or plastic sheeting, will be followed during construction, as necessary, to minimize impacts on vegetated corridors, other existing vegetation, and the Green and Duwamish Rivers (see Earth and Water sections, above, for a more detailed description of erosion and sedimentation control measures.) 5. ANIMALS a. Circle any birds and animals which have been observed on or near the site or are known to be on or near the site: birds: hawk, heron, eagle, songbirds, other: see below mammals: deer, bear, elk, beaver, other: see below fish: bass, salmon, trout, herring, shellfish, other: The Duwamish and Green Rivers and their adjacent vegetation communities support a variety of fish and wildlife. Forested, shrub, and wetland communities adjacent to the Duwamish and Green Rivers provide a variety of habitats. Bird species observed on the river during a field investigation (January 8, 1991) include: western grebe, double- crested cormorant, great blue heron, Canada goose, domestic goose, mallard, common goldeneye, hooded merganser, American coot, and gulls. Other bird species expected to use this portion of the Duwamish and Green Rivers include: pied - billed grebe; green- backed heron; blue - winged, green- winged, and cinnamon teals; northern pintail; northern shoveler; gadwall; American wigeon; canvasback; ring- necked duck; bufflehead; ruddy duck; red - tailed hawk; bald eagle; and belted kingfisher. Terrestrial forested and shrub habitats adjacent to the Duwamish and Green Rivers provide cover, nesting, and feeding areas for a number of breeding and year -round bird species. Bird species observed in terrestrial habitats during the winter site visit include: northern flicker, crow, black - capped chickadee, winter wren, golden - crowned kinglet, and American goldfinch. During the spring.and summer months, breeding residents would include numerous species of warblers, vireos, thrushes, flycatchers, and finches. The list of expected bird species was compiled from bird counts of the Tahoma Audubon Society (Bock, 1991), Birding in Seattle and King County (Hunn, 1982), and a waterfowl study conducted as part of the Green River Levee and Mill Creek . Environmental Studies (SHAPIRO, 1988). Signs of beaver, raccoon, and rabbit were observed during the field visit. Riparian and terrestrial habitats adjacent to large water bodies such as the Duwamish and Green Rivers support a wide variety of wildlife. Other mammal species expected to use habitats within the project area include shrews, voles, mice, bats, Douglas squirrel, long- tailed weasel, skunk, and opossum. In addition, amphibian and reptilian species, including Pacific tree -frog, northwestern salamander, western red - backed salamander, and western garter snake, are expected to occur in the project vicinity. Green River Trail, Phase I 24 10 BE COMPLETED BY APPLICANT The Duwamish -Green Basin is inhabited by anadromous and resident fishes. Chinook, coho, chum, and pink salmon, steelhead and sea -run cutthroat trout, and Dolly Varden comprise the recreationally and commercially important anadromous fish species that migrate, spawn, and rear in rivers and streams within the Duwamish -Green Basin (King County, 1987; Wydoski, et.al., 1979; WDF, 1975). Within the project area, the Duwamish and Green Rivers provides migration and rearing habitat for these anadromous fish. Because much of the river in this area has been channelized and the riparian vegetation has been cleared, habitat diversity is limited. Pools, riffles, streamside cover, and other beneficial fish habitat areas are lacking. Tributaries and bends of the river that currently exist in the project vicinity are important as resting areas for migrating fish. Additionally, forested and vegetated corridors along the riverbanks provide intermittent shade and bank stabilization, which are important habitat features for anadromous and resident fishes. Other resident and migratory fishes, such as sculpins, suckers, minnows, and lampreys, some of which are tolerant of poor water quality and overall degraded stream habitat, are expected to exist in this section of the Duwamish and Green Rivers. b . List any threatened or endangered species known to be on or near the site. The Washington Natural Heritage Program and the USFWS maintain records of sensitive, threatened, and endangered animal species occurring in the state. Wintering bald eagles (Haliaeetus leucocephalus), a federally listed "threatened" animal in Washington State, are expected to use the site for perching and feeding from October 31 through March 31 (Frederick, 1991). The USFWS states that the western pond turtle (Clemmys marmorata), a candidate species, may occur in the project area (Frederick, 1991); however, this is unlikely because of unsuitable habitat. No nesting bald eagles have been identified in this stretch of the Duwamish and Green Rivers, and none are expected because of unsuitable habitat. No other sensitive, threatened, or endangered wildlife species were observed during field investigations and none are expected based on habitat types found within the project vicinity. c . Is the site part of a migration route? If so, explain. The Duwamish and Green Rivers are used by migrating waterfowl. Historically, the Duwamish and Green Rivers supported large and diverse • populations of waterfowl during migration. Winter waterfowl habitat has decreased in the Duwamish -Green Basin with the draining, clearing, and diking of the river and adjacent riparian and wetland habitats. Although the diversity and abundance of migrating waterfowl on the Duwamish and Green Rivers is only a fraction of its historical use, it still provides valuable habitat for a variety of waterfowl and passerine bird species during migration. d. Proposed measures to preserve or enhance wildlife, if any: The Applicant will prepare a planting plan as part of the final design process, which will include those areas impacted by construction of bridges, underpasses, and the tunnel. Habitats disturbed during project EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 25 TO BE COMPLETED BY APPLICANT a . construction will be replanted with permanent species. In some areas, revegetation would improve habitat diversity. Proposed mitigation measures beneficial for wildlife include: • Improving wildlife habitat in some areas by replacing non - native, invasive vegetation with a variety of suitable trees, shrubs, and ground cover. • Maintaining snags and perch trees within the project vicinity wherever possible. Large black cottonwoods along the west bank of the Duwamish River east of South 141st Place (see Figure 2c) provide the best perch sites within the project vicinity and will be maintained wherever possible. Between two and four of 17 large black cottonwoods in this area would be removed, however. • Scheduling construction within the Duwamish and Green Rivers for the summer months, as specified by the Washington State Department of Fisheries, to avoid the most crucial time of year for salmon migration. • Implementing erosion and sedimentation control measures, such as covering exposed soil surfaces with mulch or plastic sheeting, during construction, as necessary, to minimize impacts on vegetated corridors, other existing vegetation, and the Green and Duwamish Rivers (see Earth and Water sections, above, for a more detailed description of erosion and sedimentation control measures). Such measures would reduce further degradation of fish and wildlife habitat. . ENERGY AND NATURAL RESOURCES What kinds of energy (electricity, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether or not it will be used for heating, manufacturing, etc. The completed project would use electricity to power lights proposed for bridge crossings, underpasses, and the tunnel. Maintenance vehicles would be gasoline- or diesel - powered. Energy required during construction would include diesel and gasoline fuel used by construction vehicles and equipment, and by workers using automobiles to travel to and from the site. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. Solar energy potential for adjacent properties would not be affected by the proposed project because the trail would be at or below the grade of existing roads, bridges, and ground surfaces. If planting plans include trees, those trees, when mature, might affect the solar energy potential of adjacent properties. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 26 TD BE COMPLETED BY APPLICANT AGENCY USE ONLY c . What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: No energy impacts are anticipated; therefore, no mitigation measures are proposed or necessary. 7. ENVIRONMENTAL HEALTH a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe: During construction, impacts on environmental health could include the potential for gasoline explosion and/or potential spillage of diesel or gasoline fuel during fueling of construction vehicles. Some incidental releases of fuel and lubricants associated with vehicles and heavy equipment also could occur. A fuel spill probably would not affect human health, but could pose a temporary threat to property and /or natural ecological systems. This potential risk is considered negligible with the proper design and use of off - site fueling and staging areas. (1) Describe special emergency services that might be required. The completed project is not expected to generate a need for special emergency services. In the event of a fuel spill in the construction staging area, remedial action may be required. (2) Proposed measures to reduce or control environmental health hazards, if any: Measures to mitigate potential environmental health impacts include: • Staging and fueling areas for construction equipment will be designed and sited to minimize potential damage and risks of spilled fuel. • Staging areas will be located away from residences, the river, and sensitive drainages. b. Noise (1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? Vehicle traffic on major roads and highways is the primary existing source of noise in the project area. Aircraft noise is ptesent, but traffic noise is dominant. Noise is not expected to affect the proposed project. EVALUATION FOR Green River Trail, Phase I 27 TO BE COMPLETED BY APPLICANT (2) What types and levels of noise would be created by or associated with the project on a short -term or a long -term basis (for example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. Noise would be generated during construction of the trail and would be noticeable at residences and businesses adjacent to and near the proposed trail alignment. Construction primarily would be limited to between 7 a.m. and 5 p.m. Because the proposed trail is designed for non - motorized uses, it is not expected to be a significant source of noise when completed. Maintenance equipment for the trail, possibly including a motorized sweeper and a motorized slope mower, would generate localized, temporary noise. Peak trail use, and therefore the highest noise levels, is expected to occur on weekends during daylight hours, and during lunch time on weekdays. (3) Proposed measures to reduce or control noise impacts, if any: Measures to mitigate potential noise impacts include: • Limiting construction activity to the period between 7 a.m. and 5 p.m. as much as possible. Some night construction of the bridges and tunnel may be required for traffic management purposes. • Ensuring that construction equipment meets federal and state noise standards. • Using mufflers on all internal combustion engine equipment. • Reducing idling time by turning off construction equipment during prolonged periods of inactivity. • Notifying affected residents and businesses in advance of any night -time construction. • Limiting operation of maintenance equipment to between 7 a.m. and 5 p.m., except for emergency maintenance. 8. LAND AND SHORELINE USE a. What is the current use of the site and adjacent properties? The developed portions of the site and adjacent properties are mostly industrial, although they also contain some single- family residential, commercial, office, and recreational uses. Near Fort Dent Park, several office buildings are under development on the west bank of the river. Several long - standing fishing huts are located just north of the park, on the west bank of the Duwamish River. A Holiday Inn located in the northern portion of the alignment on the east bank of the river, south of the Pacific Highway South bridge, would not be impacted by the trail because the trail would be located north of the bridge. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 28 10 BE COMPLETED BY APPLICANT A Seattle City Light ri extends from the south (near the 42nd Avenue South bridge. Farther Basin, a marine scrapy Single - family resident located: with commer Streets and South 143 Interurban Avenue So terminus of 27th Aven b . Has the site been u Currently, the site is n to the river and the h possible that the site w c . Describe any struct No structures are locat are in place between t South bridges and in South bridge (on the e with asphalt. The trail Access bridge (see Fi Figure 2b or 2c). Bri and at South 112th Stre d . Will any structures No structures will be d e . What is the curren In King County, the 1 1985). In Tukwila, t Family, Neighborhood Green River Trail, Phase I res on the site. t -of -way corridor, along which the trail would run, rn end of the northern portion of the proposed trail South bridge) northward to the East Marginal Way north, on the west side of the Duwamish Turning rd occupies the shore, extending into the water. al areas in the vicinity of the proposed trail are ial and industrial uses on South 143rd and 144th d Place; in the Allentown development between th and the Duwamish River; and near the southern e South and the proposed South 112th Street bridge. ed for agriculture? If so, describe. t being used for agriculture. Based on its proximity story of the valley as an agricultural region, it is s used for agriculture at some time in the past. d on the site. Short lengths of gravel path already e East Marginal Way South and Pacific Highway segment of the trail west of the Pacific Highway st bank of the river). These paths would be overlaid would use two existing bridges, the Fort Dent Park ure 2a) and the Pacific Highway South bridge (see ges just upstream of the mouth of the Black River t will be constructed as part of the trail. be demolished? If so, what? molished. zoning classification of the site? nd is zoned Heavy Manufacturing (King County, e site is zoned Light and Heavy Industrial, Single Commercial, and Agriculture (Tukwila, 1989). f . What is the curren comprehensive plan designation of the site? The current comprehe sive plan designation of the portion. of the site in King County is Urba (King County, 1985). In the City of Tukwila, the site is designated Par s and Open Space, Low Density Residential, and Light Industrial, with a special development consideration overlay indicating areas where urban development must respond sensitively to certain environmental factors (steep slopes, water surfaces, and agricultural lands) (Tukwila, 1982). EVALUATION FOR AGENCY USE ONLY 29 TO BE COMPLETED BY APPLICANT If applicable, what is the current shoreline master program designation of the site? The Shoreline Master Program designation of the Duwamish and Green Rivers along the proposed Phase I trail alignment is Urban in both King County and Tukwila (King County, 1978; Tukwila, 1974). h . Has any part of the site been classified as an "environmentally sensitive" area? If so, specify. The proposed alignment is not designated environmentally sensitive in the 1990 King County Sensitive Areas Folio. According to the Folio, the area between Highway 99 and the river extending from near the intersection of Highway 99 and Pacific Highway South to the Turning Basin is a Seismic Hazard Area (see Figures 2b and 2c). g • i . Approximately how many people would reside or work in the completed project? No people would reside or work in the completed project. Maintenance of the trail would be carried out by King County Parks personnel based elsewhere. J Approximately how many people would the completed project displace? The completed project would not displace any workers or residents. k. Proposed measures to avoid or reduce displacement impacts, if any: No displacement impacts would occur; therefore, no mitigation measures are proposed or necessary. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: Trees or other vegetation would be planted along open sections of the trail to screen unattractive features from trail users and to screen the trail from nearby residences and businesses. Speed control signs will be placed along the trail, with slower speeds at underpasses and bridges. Warning signs will be posted along the trail in advance of road intersections. At intersections, stop signs will be posted on the trail and bicycle crossing (warning) signs on the road. Pavement markings at these intersectios will further enhance safety for trail users. Guardrails will be installed where the trail runs close to a roadway, and handrails will be provided on bridge approaches and underpasses. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 30 10 BE COMPLETED BY APPLICANT 10. AESTHETICS 9. HOUSING a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low- income housing. The proposed project would not provide any housing units. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low- income housing. The proposed project would not eliminate any housing units. c. Proposed measures to reduce or control housing impacts, if any: No housing impacts are anticipated; therefore, no mitigation measures are necessary. a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? The trail would be asphalt paved, with gravel shoulders. Two bridges are proposed as part of the project. The bridge bases would be six feet above the 100 -year flood level, with top height about 10 feet above the base. Bridges would be subject to the restrictions of the applicable Shoreline Master Program and the U.S. Coast Guard. b. What views in the immediate vicinity would ' be altered or obstructed? No views would be obstructed by the proposed project. Most of the trail would be at or below the grade of existing roads, bridges, and ground surfaces. Views in the vicinity of the trail would be altered by the presence of the trail, bridges, lights, signs, trail- related landscaping, and recreational activities taking place on the trail, including cycling, walking, and running. �- c . Proposed measures to reduce or control aesthetic impacts, if any: The Applicant will prepare a planting plan as part of the final project design. Light fixtures, interpretive signs, and other trail- related improvements would be designed to be unobtrusive. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 31 TO BE COMPLETED BY APPLICANT 11. LIGHT AND GLARE a. What type of light or glare will the proposal produce? What time of day would it mainly occur? The bridge crossing on the extension to the Pacific Highway South bridge, and the underpasses and tunnel would be lighted for safety. The number, location, and type of light fixtures has not yet been determined. b. Could light or glare from the finished project be a safety hazard or interfere with views? Light and /or glare from the finished project are not expected to create a safety hazard or interfere with views. c. What existing' off -site sources of light or glare may affect your proposal? No sources of off -site light or glare are expected to affect the proposed project. d. Proposed measures to reduce or control Light and glare impacts, if any: Lighting for the trail would be designed and installed to minimize the potential for impacts, including light spillover into adjacent residential areas. No other light or glare impacts are anticipated; therefore, no further mitigation measures are proposed or necessary. 12. RECREATION a. What designated and informal recreational opportunities are in the immediate vicinity? Fort Dent Park, a King County facility, provides soccer, softball, and cricket fields, as well as restrooms and a duck pond. Foster Golf Links, owned by the City of Tukwila, is open to the public. A King County P- Patch, on the east side of the Duwamish River in the vicinity of 42nd Avenue South, has garden plots and restrooms. Informal recreation takes place along the river, including fishing and boating. b. , Would the proposed project displace any existing recreational uses? If so, describe. The proposed project would not displace any existing recreational uses. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: The project will enhance recreation opportunities in the area as both a recreation attraction itself and as a link between existing and planned recreation attractions along the Green and Duwamish Rivers. EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 32 10 BE COMPLETED BY APPLICANT AGENCY USE ONLY 13. HISTORIC AND CULTURAL PRESERVATION a. Are there any places or objects listed on, or proposed for, national, state, or local preservation registers known to be on or next to the site. If so, generally describe. There are no places or objects listed on, or proposed for, national, state, or local preservation registers on or next to the site (BOAS, 1990). b. Generally describe any landmarks or evidence of historic, archaeological, scientific, or cultural importance known to be on or next to the site. A number of historic and cultural resources are located in the vicinity of the proposed project. The City of Tukwila Comprehensive Plan (1982) shows several historic sites in the project vicinity: Fort Dent, which protected the river, then the main transportation route, during the Indian wars (1855 -58); the mouth of the Black River, which drained Lake Washington before the lake was lowered in 1916; and a boat landing, opposite the mouth of the Black River, used by the small steamers that once traveled the river. A full description of cultural, archaeological, and historic resources can be found in Cultural Resource Survey of the Green River Bicycle Trail, BOAS Inc., 1990. Interpretive signs will be placed along the trail to identify some historic or cultural resources: "Flora and Fauna" at the northern end of the southern portion of the proposed alignment; "River Morphology" west of the East Marginal Way South trail crossing; "Native American Indian History /Archaeology" near the proposed South 112th Street bridge; and "Industrial History" at the Turning Basin. Four "1% for Art" installations (a program authorized by King County Ordinance 9134) will be sited along and near the trail alignment. The commissioned pieces were selected for their native cultural history themes. The pieces are Susan Point's six Cedar Spirit Planks, Roger Fernandes' three Granite Petroglyphs, Caroline Orr and Jon Gierlich's four Benches with a Basket - Design Back, and Jaune Quick -to -See Smith's Fishing Wheel and Canoe Rack. The latter piece would be installed at Fort Dent Park near a proposed Indian Cultural Center. Final location of the three other art pieces is to be determined. c . , Proposed measures to reduce or control impacts, if any: No impacts on historic and cultural resources are anticipated; therefore, no mitigation measures are necessary. If evidence of artifacts were to be discovered during construction, work would be stopped and the appropriate authorities notified. EVALUATION FOR Green River Trail, Phase I 33 TO BE COMPLETED BY APPLICANT 14. TRANSPORTATION a. Identify public streets and highways serving the site, and describe proposed access to the existing street system. Show on site plans, if any. Formal access to Phase I of the trail would be from Fort Dent Park, from portions of the trail under development in the City of Tukwila, and from the Allentown footbridge on the east side of the proposed South 112th Street bridge. Fort Dent currently is reached via Interurban Avenue South. See Figures 2a, b, and c for major streets and access routes. Informal access to the trail would be available from public roads along the alignment. The trail crosses the following roads: 40th Avenue South, South 116th Street, 27th Avenue South, and South 102nd Street. b. Is site currently served by public transit? If not, what is the approximate distance to the nearest transit stop? Metro provides bus service to numerous stops in the project vicinity, including a multi -route stop near Fort Dent Park. c. How many parking spaces would the completed project have? No parking spaces would be provided. How many would the project eliminate? No parking spaces would be eliminated. d. Will the proposal require any new roads or streets, or improvements to existing roads or streets, not including driveways? If so, generally describe (indicate whether public or private). No new streets or roads will be required. An existing sidewalk on the west side of the Pacific Highway South bridge will be widened to accommodate the trail, and two additional bridges will be built over the river, one just upstream of the mouth of the Black River, and one at South 112th Street . Warning signs will be posted along the trail in advance of road intersections. At intersections, stop signs will be posted along the trail, and bicycle crossing signs along the road. Pavement will be marked at trail and road intersections. e . Will the project use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. No railroad tracks are located within the project area. Railroad tracks in the vicinity of the project area roughly parallel Interurban Avenue South on the east side of the river, opposite the proposed trail alignment. River traffic on the Duwamish is mostly downstream of the Pacific Highway South bridge. Green River Trail, Phase I 34 EVALUATION FOR AGENCY USE ONLY TAO BE COMPLETED EVALUATION FOR BY APPLICANT AGENCY USE ONLY f . How many vehicular trips per day would be generated by the completed project? If known, indicate when peak volumes would occur. g • The number of automobile trips the Green River Trail would generate is not known. The trail is expected to be used most heavily on weekends and during the lunch hour on weekdays; no peak -hour automobile trips would be generated. A count of trail users taken on August 30, 1988, at Bicentennial Park, south of Fort Dent Park at Strander Boulevard and Christensen Road, indicated between 600 and 650 trail users between 8:30 a.m. and 5:00 p.m. (Williams, 1991). It is likely that when Phase I of the Green River Trail is complete initial trail use will be low, but will increase over time as public awareness of the trail increases and connecting phases are constructed. Proposed measures to reduce or control transportation impacts, if any: The project would not generate peak -hour automobile trips; therefore, no mitigation measures are proposed or necessary. 15. PUBLIC SERVICES a. Would the project result in an increased need for public services (for example: fire protection, police protection, health care, schools, other)? If so, generally The proposed project may result in a slight increase in the demand for police and emergency medical services. No increase in demand for other public services is anticipated. b. Proposed measures to reduce or control direct impacts on public services, if any. Bridge crossings, underpasses, and the tunnel would be lighted for safety. Trail design would be consistent with accepted trail safety standards. Installation of removable bollards or master -keyed gates would allow emergency vehicles access to the trail, if needed. No impacts on other public services are anticipated; therefore no additional mitigation measures are necessary. 16. UTILITIES a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other. Green River Trail, Phase I 35 'ie;: u: �x�;; �- 4; u. if�3:::.....: � il' s: i4': � !�i= 'L��_i•2sfr...,'�tF >F,::u. �u >v:rar. 10 BE COMPLETED BY APPLICANT b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. Electricity would be used for lighting the Pacific Highway South bridge crossing, the underpasses, and the tunnel. Electricity is available from Seattle City Light along the alignment. The amount of construction required for installation of lighting would depend on the number, location, and type of lighting fixtures, which has not yet been determined. The trail will be designed to minimize the need for relocating existing utilities. Current design indicates that some existing power poles and fire hydrants will need to be relocated. C. SIGNATURE The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature Date Submitted of SHAPI O AND ASSOCIA INC. 642.//0 rot— 4141 1 /d ; Mf L EVALUATION FOR AGENCY USE ONLY Green River Trail, Phase I 36 REFERENCES King County, 1990b. King County Sensitive Areas Ordinance. BOAS Inc., 1990. Cultural Resource Survey of the Green River Bicycle Trail. Prepared for MacLeod Reckord, Seattle, Washington. Bock, Thais, February 18, 1991. Tahoma Audubon Society. Letter to Shapiro and Associates, Inc. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe, 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service, Pub. #FWS /OBS- 79/31. 131 pp. Cyra, Thomas A., January 17, 1991. Biologist, Washington Department of Wildlife, Nongame Data Systems. Letter to Shapiro and Associates, Inc. Federal Emergency Management Agency (FEMA), September 29, 1989. Flood Insurance Rate Maps. King County, Washington. Map Number 53033C0000, Panels 170, 310, 326, 328. Federal Interagency Committee for Wetland Delineation, 1989. Federal Manual for Identifying and Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and U.S.D.A. Soil Conservation Service, Washington, D.C. Cooperative technical publication. 138 pp. Frederick, David C., February 20, 1991. Field Supervisor, U.S. Department of the Interior, Fish and Wildlife Service. Letter to Shapiro and Associates, Inc. Hitchcock, C.L. and A. Cronquist, 1976. Flora of the Pacific Northwest. University of Washington Press, Seattle, Washington. Hong West and Associates, 1991. Geotechnical Investigation, Final Report. Green River Trail Project. King County, Tukwila, Seattle, Washington. Hunn, E.S., 1982. Birding in Seattle and King County. Seattle Audobon Society Trailside Series. Jones & Jones, 1988. Green River Trail Master Plan. Prepared for King County Division of Natural Resources and Parks. King,County, 1978. Shoreline Master Program, Title 25. Building and Land Development Division. King County, 1985. King County Code, Title 21. King County, 1987. King County Basin Reconnaissance Program, Volumes 1-3. Department of Public Works and Parks, Planning, and Resources Department. King County, 1990a. King County Sensitive Areas Map Folio. Planning and Community Development Division, Department of Parks, Planning and Resources. DRAFT 1/10/92 37 REFERENCES (continued) King County, 1990c. King County Surface Water Design Manual. Surface Water Management Division, Department of Public Works. Massey, Steve, 1991. Project Administrator, Capital Improvements, King County Parks Division. Personal communication. Norwood, Sandy, February 14, 1991. Environmental Review Coordinator, Washington Department,of Natural Resources, Washington Natural Heritage Program. Letter to Shapiro and Associates, Inc. Shapiro and Associates, Inc., 1988. Green River Levee and Mill Creek Environmental Studies. Shapiro and Associates, Inc., 1991. Sensitive Areas Reconnaissance for Green River Trail, Phase I. Letter to MacLeod Reckord dated March 5, 1991. Siegenthaler, Anne, 1991. Planner, City of Tukwila. Personal communication. Tukwila, City of, 1974. Shoreline Master Program. Tukwila, City of, 1982. Comprehensive Land Use Policy Plan. Tukwila, City of, 1989. Zoning Code, Title 18. Tukwila, City of, 1991. Sensitive Areas Ordinance, No. 1599. U.S. Department of Agriculture, Soil Conservation Service, 1973. Soil Survey of King County Area, Washington. U.S. Department of Agriculture, Soil Conservation Service, December 1987. Hydric Soils of the United States. Prepared in cooperation with the National Technical Committee for Hydric Soils. U.S. Department of Agriculture, Soil Conservation Service, King County Field Office, Renton, Washington, February 1991. Personal communication. Washington Department of Fisheries (WDF), 1975. A Catalog of Washington Streams and -Salmon Utilization, Volumes 1 -3. Olympia, Washington. Williams, Don, 1991. Director Parks and Recreation, City of Tukwila. Personal communication. Wilson, Darren, 1991. Assistant Planner, City of Tukwila. Personal communication. DRAFT 1/10/92 38