TagSustainable Airport Master Plan(280)

This traffic engineering report analyzes three signalized intersections along S 128th Street near SR 509 in the Sea-Tac area under projected 2032 No Action conditions during the PM peak hour. The study finds that the SR 509 ramp intersections are operating well over capacity, with an Intersection Capacity Utilization of 104.6% and an ICU Level of Service G, while the Des Moines Way S intersection operates more acceptably at 63.3% ICU. Overall intersection control delays range from approximately 19 to 27 seconds, with most approaches functioning at Level of Service B or C.

The Bonneville Power Administration's 2018–2023 Strategic Plan Progress Update outlines the agency's efforts to improve its financial health, modernize its power grid assets, and better serve customers across the Pacific Northwest. The plan identifies five strategic goals, including strengthening financial performance, providing competitive power products, and valuing its workforce. This update, issued nearly three years after the original 2018 plan, documents accomplishments and highlights areas needing further attention.

The 1997 Sea-Tac International Airport Impact Mitigation Study is an initial assessment and recommendations report prepared for several cities near Seattle-Tacoma International Airport, including Burien, Des Moines, Federal Way, Normandy Park, and Tukwila, as well as the Highline School District and Highline Community Hospital. Funded by a State of Washington grant, the study was conducted by Hellmuth, Obata + Kassabaum, Inc. and Raytheon Infrastructure Services, Inc. to evaluate the airport's impacts on surrounding communities. The report was submitted as part of public engagement materials related to ongoing concerns about airport noise and air pollution affecting nearby residents and institutions.

Appendix O of the Sustainable Airport Master Plan (SAMP) Environmental Assessment documents how the FAA engaged the public and agencies during the NEPA review process for Sea-Tac Airport, including public meetings, briefings, and outreach to communities, elected officials, and underrepresented groups. The summary notes that several Executive Orders and CEQ regulations referenced during the Draft EA have since been revoked, and that the FAA's final decision will rely on updated federal guidance including FAA Order 1050.1F and Executive Order 14154. Public comments received and submitted studies are also included as part of this appendix.