This document is Appendix N of the Seattle-Tacoma International Airport Part 150 Noise Compatibility Study Update, compiled by Landrum & Brown in October 2013. It contains the FAA's official approval, dated August 19, 2010, of the aviation activity forecast submitted by Sea-Tac Airport in July 2010. The FAA determined that the forecast provided adequate justification for total aircraft operations and authorized its use in the airport's Noise Compatibility Plan Update.

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Appendix N of the Seattle-Tacoma International Airport Part 150 Noise Compatibility Study Update, containing the FAA forecast approval letter dated August 19, 2010. The FAA reviewed the July 2010 Aviation Activity Forecast for Sea-Tac Airport and approved the forecasts for use in the FAR Part 150 Noise Compatibility Plan Update. The approval was issued by the FAA Northwest Mountain Region Seattle Airports District Office.

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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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