April 24, 2026July 29, 2026

Request for updated information to complete hazard assessments of contaminated sites located at SeaTac Airport

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The Washington State Department of Ecology sent a letter to Megan King at Port of Seattle requesting updated information about contaminated sites at SeaTac Airport by August 31, 2026. The letter explains the Site Hazard Assessment and Ranking Process (SHARP) used to evaluate contamination in soil, groundwater, surface water, sediment, and indoor air. Six specific contaminated sites are listed, including fuel farms, a baggage tunnel, and a rental car facility, all located at or near SeaTac Airport.

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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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