This August 2019 Port of Seattle briefing outlines the airport's sound mitigation program for neighborhoods near Sea-Tac Airport. It defines a Noise Remedy Boundary based on the 2018 forecasted DNL 65 dB contour, covering areas roughly between 240th Street, 8th Avenue, HWY 99, and 101st Street. Eligible homeowners can receive free sound insulation—including rated windows, doors, and ventilation—in exchange for granting the Port an Avigation Easement, with the goal of reducing interior noise levels to DNL 45 dB or less.

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A Port of Seattle presentation to the StART committee covering the noise remedy boundary and sound insulation program at Sea-Tac Airport. The briefing explains the 2018 forecasted DNL 65 dB contour and the geographic boundaries of the noise remedy area. It also outlines the sound insulation program, which provides free installation of sound-rated windows, doors, and ventilation to homeowners in exchange for an avigation easement.

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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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