October 31, 2012August 9, 2026

Draft Environmental Assessment for Greener Skies Over Seattle: Proposed Arrival Procedures to Seattle-Tacoma International Airport, Volume 2 – Appendices

Notes

FAA Draft Environmental Assessment (EA), Volume 2 Appendices, for the Greener Skies Over Seattle project proposing new arrival procedures to Seattle-Tacoma International Airport (Sea-Tac Airport / KSEA), dated 31 October 2012. Appendices cover noise metrics (DNL, SEL, Leq, dBA), NIRS noise modeling technical report, aircraft operations and flight tracks, runway utilization, meteorological conditions, historic resource sites, Endangered Species Act compliance, agency and tribal scoping meeting records, CATEX for limited testing, current published approach procedures, and targets files for proposed new routings. Prepared by FAA Northwest Mountain Region, Renton, Washington. Includes State Historic Preservation Office letter of concurrence with APE and cultural resources report.

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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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