Notes

Appendix A, Section 5 (pages 61–99) of the Stantec 2019/2020 Department of Commerce Sea-Tac Airport Communities Impact Study, dated 29 May 2020. Covers noise and vibration effects of Seattle-Tacoma International Airport operations from 1997 to 2019. Topics include aircraft noise metrics (Lmax, SEL, DNL), A-weighted decibel (dBA) scale, Day-Night Average Sound Level (DNL), Sound Exposure Level (SEL), FAA noise assessment standards, and typical sound levels from carrier jet takeoffs, ground operations, road traffic, and construction. Discusses noise sources including aircraft taxiing, fuel trucks, maintenance equipment, and periodic construction. References EPA 1974 sound level data and Oregon Airspace Initiative 2016.

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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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