This 2017 Noise Technical Report, prepared by The Greenbusch Group for the Washington State Department of Transportation, evaluates the noise impacts of Phase 1 of the SR 509 Completion Project near Seattle-Tacoma International Airport. It compares the proposed highway improvements against a 2003 environmental impact study, assessing changes in noise levels, affected residents, and noise abatement measures such as sound walls. The report concludes with recommendations for minimizing construction and long-term traffic noise impacts on surrounding communities.Open full document
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This noise technical report, prepared by The Greenbusch Group for the Washington State Department of Transportation, evaluates the noise impacts of Phase 1 improvements to the SR 509 Completion Project. It compares the Phase 1 improvements to the 2003 Final Environmental Impact Statement Alternative C2, analyzes changes in the affected environment, and assesses traffic noise abatement measures including proposed noise walls.