January 16, 1984August 1, 2026

Final Evaluation of Noise Abatement and Noise Remedy Measures – Acoustical Treatment of Existing Structures

This draft report from Peat Marwick, consultants to the Port of Seattle, evaluates noise remedy measures for neighborhoods surrounding Seattle-Tacoma International Airport. It outlines eligibility criteria for a sound insulation program, targeting approximately 5,529 existing residential structures exposed to noise levels of Ldn 70 or higher in 1980, or Ldn 65 or higher projected for the year 2000. The recommendations build on the 1976 Sea-Tac/Communities Plan, reflecting updated noise exposure data, airline deregulation impacts, and residential growth in the area.

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This document outlines noise remedy measures for Sea-Tac Airport, specifically focusing on acoustical treatment of existing structures. It details eligibility criteria for sound insulation programs, including structures in areas with noise exposure of Ldn 70 and above, and discusses the evolution from the 1976 Sea-Tac/Communities Plan to updated noise metrics and program boundaries.

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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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