December 2, 2014July 28, 2026

SEPA Environmental checklist: Seattle-Tacoma International Airport (STIA) North Satellite (NSAT) Terminal Expansion

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This SEPA environmental checklist prepared by the Port of Seattle covers the proposed renovation and expansion of the North Satellite Terminal at Seattle-Tacoma International Airport. The project would expand the terminal footprint from 91,500 to 154,500 square feet, adding eight new airplane gates for a total of twenty contact gates. Construction was planned in two or four phases between 2015 and 2020.

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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.

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