May 1, 2026August 9, 2026

Chapter 3: Affected Environment — Seattle-Tacoma International Airport SEPA Environmental Impact Statement for the Sustainable Airport Master Plan Near-Term Projects

Notes

Draft SEPA Environmental Impact Statement (EIS) Chapter 3, Affected Environment, for the Seattle-Tacoma International Airport (Sea-Tac Airport) Sustainable Airport Master Plan (SAMP) near-term projects, May 2026. Describes baseline conditions as of 2022 under WAC 197-11-444 within the General Study Area (GSA) encompassing 3,692 acres (5.8 square miles) in the City of SeaTac, King County, Washington. Airport bounded by SR 99, SR 509, S. 142nd Place, and S. 200th Street on approximately 2,800 acres. Incorporates by reference the NEPA EA Section 3, Affected Environment. GSA loosely bounded by S. 140th Street, 33rd Avenue S., S. 20th Street, and Des Moines Way. Nearby cities include Burien, Des Moines, Normandy Park, SeaTac, Tukwila, Federal Way, Kent, and Seattle. Washington Growth Management Act urban growth area designation (RCW 36.70A). Port of Seattle project.

Sidebar On/Off

Upcoming Events

StART SEA Stakeholder Advisory Round Table
Add to CalendarMWednesday Aug 26, 5:00pm - 7:00pm
Zoom (Virtual Meeting)

Meeting Objectives Introduce the primary feedback themes identified by StART members regarding StART’s Operating Procedures and determine areas that may warrant future discussion. 5:00 PM – Welcome Meeting Management Welcome Lead: Andrés Mantilla, Facilitator, Uncommon Bridges; Wendy Reiter, Airport Managing Director, POS 5:15 PM – Dinner: All participants eat. 5:30 PM – StART Operating Procedures
[...]
Commercial Aviation Work Group
Add to CalendarMThursday Sep 3, 10:00am - 1:30pm
Virtual Meeting (Zoom)

Meeting Agenda 10:00 a.m. – 10:15 a.m. | Welcome – Evan Nordby, Chair a. Introductions and Agenda Reviewb. Status of appointments and non-voting member invitationsc. Other updates as necessary 10:15 a.m. – 11:00 a.m. | Is it practical and legal to operate the western Washington [Puget Sound] airports as a single airport system? – Consultant
[...]

[See all...]

As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

continue...

V V

Notes

Message