DETERMINATION OF NONSIGNIFICANCE (DNS) TACOMA DOME ACCESS IMPROVEMENTS PROJECT Description of Proposal: Sound Transit proposes to provide access improvements to the Tacoma Dome Station along the Sounder South Commuter Rail line. Access improvements would include enhanced walking, bicycling, parking and driving to and from the station. Other proposed improvements include new and updated sidewalks, Americans with Disabilities Act (ADA) compliant ramps, and bike lanes. Proponent: Sound Transit (Central Puget Sound Regional Transit Authority) Location of the Proposal: Tacoma, Washington Lead Agency: Sound Transit (Central Puget Sound Regional Transit Authority) The lead agency for this proposal has determined that it 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 the completed environmental checklist and other information on file with Sound Transit. This determination of nonsignificance (DNS) is issued under WAC 197-11-340(2) and Sound Transit's State Environmental Policy Act (SEPA) rules (Resolution R2018-17). The lead agency will not act on the proposal for 14 days from the date of issue below. Availability of Documents: The SEPA Checklist and associated materials are available for review and download at soundtransit.org/tdai-sepa. Contact Elma Borbe, Senior Environmental Manager, at (206) 398-5445 or elma.borbe@soundtransit.org for questions or to request hard copies (at cost). Comments Due: Comments must be submitted by 5:00 p.m., January 29, 2026. Email comments should be submitted to tdaisepacomments@soundtransit.org.Written comments should be mailed to Elma Borbe, Senior Environmental Planner, Sound Transit, 401 S. Jackson Street, Seattle, WA 98104. The responsible official will reconsider the DNS based on timely comments and may retain, modify or, if significant adverse impacts are likely, withdraw the DNS. If the DNS is retained, it will be final after the expiration of the comment deadline. Responsible official: Perry Weinberg Position/title: Managing Legal Counsel Phone: (206) 920-7130 Address: Sound Transit Legal Department Union Station, 401 South Jackson St., Seattle, WA 98104-2826 Challenges to this Determination of Nonsignificance (DNS) are governed by Sound Transit Resolution R2018-17 and the SEPA rules and regulations (Ch. 43.21C RCW and WAC 197-11- 680). Sound Transit Resolution R1018-17 is available online at: Resolution R2018-17.pdf. As provided in Resolution R2018-17, appeals of SEPA determinations must be made in writing by filing a letter of appeal and paying the required fee within 14 days following the date the environmental document is issued under SEPA. You should be prepared to make specific factual objections. Letters of appeal should be addressed to the Chief Executive Officer, Sound Transit, Union Station, 401 South Jackson Street, Seattle, Washington 98104-2826. For this DNS, appeals must be received by Sound Transit on or before 5:00 p.m. on February 5, 2026. Contact Perry Weinberg for arrangements if you require hand delivery of an appeal. Additional details about the appeals process and requirements are set out in Resolution R2018-17 and in the SEPA rules and regulations. Signature: Perry Weinberg 1/8/2026 IPL0302031 Jan 14,21,28 2026