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STRIDE Bus Rapid Transit
South Renton Transit Center (SRTC) Site Plan Review, Conditional Use Permit, Master Site
Plan Review, and Lot Line Adjustment Application
Attachment 6b
I-405 BRT South Renton Transit Center SEPA Addendum
June 2024
Prepared by the
Design Management Plan Sound Transit
SEPA ADDENDUM
Description of Proposal: Sound Transit is partnering with the Washington State Department of
Transportation (WSDOT) to implement new bus rapid transit (BRT) service along I-405, a portion of SR 518, and along some local city streets between Burien and Lynnwood, consistent with the I-405 Master Plan. As part of the I-405 BRT program, Sound Transit proposes to construct BRT stations and parking facilities including a new South Renton Transit Center
(SRTC). The SRTC includes a BRT station, roadway, bicycle, and pedestrian improvements.
Other components of the I-405 BRT program have been reviewed by and will be implemented by WSDOT. This addendum addresses the South Renton Transit Center and roadway improvement elements.
Description of Addendum: This addendum provides additional information and analysis
supporting Sound Transit’s September 30, 2020 environmental checklist and Determination of Nonsignificance (DNS) for the I-405 BRT project. The addendum is issued pursuant to WAC 197-11-600(4)(c) and WAC 197-11-625. The addendum includes the National Environmental Policy Act (NEPA) documented categorical exclusion (DCE) prepared for the South Renton
Transit Center and Roadway Improvements project, approved by the Federal Transit
Administration on June 3, 2022. The NEPA DCE evaluated impacts for the full project build-out as well as the interim condition of the site resulting from the August 2021 Sound Transit Board decision (R2021-05) to delay of the construction of the park-and-ride garage. This addendum also includes analysis and information about minor design updates to the South Renton Transit
Center and roadway improvements proposal. The addendum does not substantially change the
analysis of likely project impacts. An addendum may be issued for any SEPA document, and there is no set format. There is no comment period or appeal period for this addendum. Proponent: Sound Transit (Central Puget Sound Regional Transit Authority)
Location of the Proposal: Renton, Washington Lead Agency: Sound Transit (Central Puget Sound Regional Transit Authority)
Responsible official: Perry Weinberg Position/title: Deputy Executive Director, Office of Environmental Affairs and Sustainability
Phone: (206) 689-4931
Address: Sound Transit Office of Environmental Affairs and Sustainability Union Station, 401 South Jackson St., Seattle, WA 98104-2826
Date: June 7, 2024 Signature: __________________________ Perry Weinberg The SEPA determination and environmental checklist are available at
https://www.soundtransit.org/system-expansion/stride-s1-line/documents. Questions regarding
the SEPA documents may be made by contacting Lesley Maurer, Senior Environmental Planner, at lesley.maurer@soundtransit.org or 206-553-3892. The following reports are included in this Addendum and are available at
https://www.soundtransit.org/system-expansion/stride-s1-line/documents:
• South Renton Transit Center and Roadway Improvements project, NEPA Documented Categorical Exclusion (DCE), Federal Transit Administration (June 2022).
• Additional Environmental Analysis for the South Renton Transit Center at Final Design
(June 2024), with Attachment A
o Attachment A: South Renton Transit Center Additional Transportation Analysis Memorandum (June 2024)