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Home My WebLink AboutTrans 2014-12-08 Item 2A - Update - Tukwila Urban Center Pedestrian-Bicycle Bridge Supplemental Type, Size and Location ReportTO: City of Tukwila Jim Haggerton, Mayor INFORMATIONAL MEMORANDUM Mayor Haggerton Transportation Committee FROM: Bob Giberson, Public Works Director f),6 BY: Cyndy Knighton, Senior Program Manager DATE: December 5, 2014 SUBJECT: TUC Pedestrian - Bicycle Bridge Over Green River Project No. 90510403 Supplemental Type, Size, and Location Report ISSUE Update the Transportation Committee on the Supplemental Type, Size, and Location Report (TS &L) of the TUC Pedestrian - Bicycle Bridge project. BACKGROUND Since 2005, staff and the consultant design team led by KPFF Engineers have been working on planning and design of the TUC Pedestrian - Bicycle Bridge over Green River. Council directed staff to design a signature bridge as one of three catalyst projects of the Southcenter subarea plan's Mall -to- Station vision of a dense, urban, transit and pedestrian - friendly live- work -play area. In October 2011, Council accepted the TS &L report and authorized staff to proceed with the Twin Tied Arch option with Alignment #1 for the western trail as the preferred approach, pending successful right of way acquisition. A modified version of Alignment #2 has been designed through the 30% level after staff identified the parking impacts of Alignment #1. Alignment #3, which utilizes the existing Green River Trail, was identified as a viable option should land acquisition delay the project or become unavailable (Attachment 1). On December 23, 2013, the City received a letter (Attachment 2) from the attorney for BRCP Riverview Plaza LLC stating the intent "...to take all available actions to prevent the location of the bridge on its property." After receipt of this letter, staff met with representatives of Riverview Plaza and prepared a Supplemental TS &L Report in which 6 new alternatives were studied (Attachment 3). DISCUSSION After studying the bridge alignment alternatives and associated trail approach options, the conclusion is that the original alternative remains the most direct route for users but the likely contentious right of way acquisition would delay the project and potentially add significant costs. Bridge Alignment A was identified as having lesser land acquisition impacts while best meeting the larger goal of the project of providing a direct and attractive non - motorized connection between regional retail and transit oriented development districts and the City's two main transit hubs (Attachments 4 -6). Financial Impact Exact fiscal impacts are not yet known. The main bridge structure is expected to be comparable in cost but a small approach structure will add costs. The ADA accessible ramp on the east side is shorter which will reduce costs. Land acquisition costs will be significantly reduced due to the use of the Green River Trail on an existing easement for the western trail approach. Additional fee will be necessary to develop the design to the 30% level though much of the completed design can be utilized with the preferred alignment. RECOMMENDATION Information only. Attachments: Trail Alignment Options from Original TS &L Jack McCullough letter Trail Alignment Options studied in Supplemental TS &L Current Alignment graphic Supplemental TS &L Proposed Alignment graphic Comparison Matrix W: \PW Eng \PROJECTS\A- RW & RS Projects \TUC Ped Bicycle Bridge (90510403) \INFORMATION MEMO - Supplemental TSL Report 11 -10 -14 - sb.docx 1 Multiple Alignments Studied Attachment 1 2 'Cyndy Knighton December 19, 2013 Page 2 of 2 Failure to analyze the impacts of the bridge and its alternatives also violates the prohibition against "piecernealing" of environmental review. SEPA recptires that "[p]roposals or parts of proposals that are related to each other closely enough to be, in effect, a single course of action shall be evaluated in the same environmental document." WAC 197-11-060(3)(b). Here, the bridge is a part of the City's Urban Center Plan. Under SEPA, the City must analyze the bridges' environmental impacts and alternatives in the same environmental document as the Urban Center Plan — specifically, the EIS that currently being prepared. In sum, before moving fonvard with planning, design, permitting and construction of a bridge at any location, the City must first conduct a full analysis of its impacts and alternatives as part of the EIS for the Urban Center Plan. Pursuant to Tukwila Municipal Code ("TMC") 18.104.100, 18.104.170 and 21.04.210, please include me and Courtney Kaylor at the address stated below as parties of record regarding any City decisions relating to the bridge or its environmental review. Sincerely, cc: Client Jack Pace, Director, Department of Community Development Shelley Kerslake, Kenyon Disend 4 �:< , 1 ..c. _ py i a 6300 s/ . 00 1J1 ------- 60.131, - �0 pmt oeo X33 .4503160219 ° 930.130267 - ��r• �!.: c 'v -f- LO ACRES —WAY'; 1 t. ¢. T2 BEh1 WESTERN: F :c: :7 3.38 A< :.: 7906050099 PCL. TUKWILA URBAN CENTER PEDESTRIAN / BICYCLE BRIDGE ALIGNMENT ALTERNATIVES 02/18/2014 E luaWipelTy CURRENT ALIGNMENT (TS &L ALIGNMENT 2) This trail connection begins near the intersection of Baker Blvd and Christensen Rd and heads north. The trail turns east through the Riverview Plaza property and intersects the Green River Trail. Here the 225 -foot main bridge span crosses the Green River and lands at the Nelsen Parcel. A 164 -foot ramp structure and landing brings trail users to the existing sidewalk along West Valley Highway. GREEN RIVER BAKER BLVD 100 .200 TUKWILA URBAN CENTER PEDESTRIAN / BICYCLE BRIDGE 10/27 /2014 V luawyae4TV PROPOSED ALIGNMENT This trail connection begins near the intersection of Baker Blvd and Christensen Rd and heads north to where the Green River Trail intersects Christensen Road near the northwest corner of the Riverview Plaza property. The alignment follows the existing Green River Trail east towards the proposed bridge location. The bridge crosses the Green River with a 45 -foot approach span and a 220 -foot main bridge span. A 105 -foot ramp structure and landing brings trail users to the existing sidewalk along West Valley Highway. GREEN RIVER EIND ca.,why Enycmds p CC,,z" u t 14. t- s s • TUKWILA URBAN CENTER PEDESTRIAN / BICYCLE BRIDGE IA] 11 inch = 200 feet 10/27/2014 PROPOSED ALIGNMENT PLAN N \ 45'7.4PpR Iq PAN DP CPC ENCA3YE:rt (1.192' `°`A �DUE , GREEN RIVER TRAIL EASEMENT MA /NSPgN STAIRS TO WVH RIVERVIEW PLAZA £E- 105 -FT RAMP STRUCTURE TRAIL LANDING Q LSEN PARCEL Consulting Engineers SIM MN 2172‘19E NAI 911 TUKWILA URBAN CENTER PEDESTRIAN / BICYCLE BRIDGE DATE: 10/23/2014 JOB # 107387 PROPOSED ALIGNMENT D ID 21 w PLAN IMA- 20 het 008MO `TAL e0A18 CO 80 oa Ped Bndge) \CABB \B]B\Mode O0 PROPOSED ALIGNMENT PROFILE 55 50 45 40 35 30 25 20 15 10 45 ft Approach Span 220 ft Main Span 105 ft Ramp Structure R d 100 YR WATER SURFACE EIEVAl1081 270 (NNW 88) PER EOM FLOW PROFILES GREEN RIVER, SECTION AP /AO .30.8'4 (FROM SURVEY) 518. 104222 AN 578. 110000 PN a =09.70 w 507.1141009 11=3595 • 22008 8 A -2200 R =210875 C@11ERN8NE OF SPAN 518. 11010.2 28.9' (FROM SURVE0) f g, 'b' i I 80 / 300A - -- `9 RFACE FROM OTY OF TUK00I AERIAL CONTOURS (2013) `51A 12 +2609 =AS COMAE ti 55 50 45 40 35 30 25 20 15 10 5 0 0 8 +80 9 +00 9 +20 9 +40 9 +60 9 +80 10 +00 10 +20 10 +40 10 +60 10 +80 11 +00 11 +20 11 +40 11 +60 11 +80 12 +00 12 +20 12 +40 12 +60 12 +80 13 +00 13 +20 13 +40 13 +60 13 +80 14 +00 TUKWILA URBAN CENTER PEDESTRIAN / BICYCLE BRIDGE DATE: 10121/2014 JOB #: 107387 0 10 20 40 0 25 s 11M•20. 1I.=5lee SORIEOHTAL SCALE SEISMAL SCALE Attachment 6 Tukwila Urban Center Pedestrian /Bicycle Bridge Comparison Matrix for Current and Proposed Alignment KPFF Consulting Engineers 11/3/2014 10 Current Alignment (TS &L Alignment 2) Proposed Alignment • ROW acquisition required for trail segment that • Utilizes existing easement for Green River Trail Right -of -Way passes through Riverview • ROW acquisition required (ROW) Impacts Plaza (RVP) parking lot for Nelsen Parcel • ROW acquisition required for Nelsen Parcel • Bridge location requires removal of two large fir trees deemed significant by WDFW. Study required • Potential impacts to mature Cottonwood trees in the City park/open space north of RVP. Environmental/ to determine if bridge Alignment could be Permitting needs to be relocated or mitigation is possible • adjusted to avoid impacts No major obstacles • No other major obstacles identified for obtaining necessary permits identified for obtaining necessary permits • Structure and fill to be placed in floodplain. • Structure and fill to be placed in floodplain. Hydraulics Hydraulic analysis required to demonstrate Hydraulic analysis required to demonstrate "no- rise" for current flood elevation "no- rise" for current flood elevation Structure • 225 -foot main bridge span and 160 -foot ramp structure • 45 -foot approach span, 220 -foot main bridge span and 105 -foot ramp structure • Structure placed within • Structure placed within Levee Impact levee prism. No concerns voiced by USACE levee prism. No concerns voiced by USACE • Increased ROW costs associated with RVP parcel acquisition • Increased bridge structure costs associated with 45ft long approach structure • Increased cost associated • Reduced land acquisition Cost with longer landing at Nelsen Parcel costs due to use of existing trail easement • Additional design fee likely required to develop design KPFF Consulting Engineers 11/3/2014 10