Long-Range Plan Draft Supplemental Environmental Impact Statement

On June 13, 2014, Sound Transit released the Long-Range Plan Update Draft Supplemental Environmental Impact Statement (Draft SEIS) for public comment in accordance with the Washington State Environmental Policy Act (SEPA).

You are encouraged to read and comment on Sound Transit's Long-Range Plan Draft SEIS. Input during this comment period will be addressed in the Final SEIS and will help inform the Board when it updates the Long-Range Plan after publication of the Final SEIS.  Analysis and public feedback will help the Sound Transit Board determine how the agency's Long-Range Plan should be updated. In addition, it may also help inform the Board where mass transit should expand after the current set of projects are complete in 2023, funding for which was approved by voters in 2008.    

How can you comment on the Draft SEIS?
Send an email. Write us. Fill out a comment form at a public meeting. Speak directly with a court reporter. Comments can be about anything related to the Long-Range Plan; ranging from opinions on transit use and corridors, to discussions on technical aspects of the environmental analysis.  

The 45-day comment period began June 13, 2014 and ends July 28, 2014.

  • In person: Complete a comment form, provide verbal comment to a court reporter at a public open house, or provide your testimony during the public hearing.
  • Email: LongRangePlan@soundtransit.org
  • Mail: Sound Transit, Attn: Karin Ertl, 401 S. Jackson St., Seattle, WA 98104  
  • An online survey is also available to provide easy feedback on the Long-Range Plan.

Copies of the Draft SEIS: Hard copies of the Draft SEIS are available for $20.00 and hard copies of the separately bound Transportation Technical Report (Appendix K) are available for $15. The Executive Summary and a CD including the Draft SEIS, the Transportation Technical Report, and all other appendices are available at no charge. Please contact Karin Ertl for copies at 206/398-5360 or Karin.ertl@soundtransit.org

Documents in .pdf format require the free Adobe Acrobat Reader to view.


Cover Letter, Fact Sheet, Table of Contents and Acronyms (577 KB)

Executive Summary (3.3MB)

Chapter 1: Purpose and Need (273 KB)

Chapter 2: Alternatives Considered  (949 KB)

Chapter 3: Transportation Impacts and Mitigation (1 MB)

Chapter 4: Environmental Impacts and Mitigation (6.5 MB)

References, Glossary, List of Preparers, and Distribution List (240 KB)


Appendix A: Current Plan and Potential Plan Modifications Alternatives: Corridors and Representative Projects/Programs/Policies  (264 KB)

Appendix B: Agency Coordination and Public Involvement (1.1 MB)

Appendix C: Water Resource Inventory Areas and Category 5 Listings (1.2 MB)

Appendix D: Regionally Important Ecosystem Resources (134 KB)

Appendix E: High Risk Hazardous Materials Sites in the Plan Area (278 KB)

Appendix F: Consistency with Land Use Plans, Policies, and Legislation (400 KB)

Appendix G: Parks and Recreation Facilities in the Plan Area (604 KB)

Appendix H: NRHP-listed Architectural Historic Properties and Districts in the Plan Area (526 KB)

Appendix I: Transportation Projects Considered for Cumulative Impacts Analysis (252 KB)

Appendix J: Environmental Justice Study (448 KB)

Appendix K: Transportation Technical Report (3 MB) 

*Printed versions are available on request for the cost of reproduction.