Google Earth satellite image showing the Seattle-Tacoma International Airport (Sea-Tac) area with a red shaded overlay indicating a noise impact or flight path zone, and a blue outline delineating the airport property boundary. Visible highway labels include I-5, SR-509, SR-518, SR-516, and SR-99, placing the map in the SeaTac/Burien/Des Moines area of King County, Washington.

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The outlined area in blue is the Area of Potential Effect (APE)–the boundary of consideration for most aspects of the SAMP NEPA review process. The red is the 2024 DNL65 boundary.

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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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