This January 2018 environmental re-evaluation examines the potential impacts of Phase 1 of the SR 509 Completion Project, part of the Puget Sound Gateway Program, prepared for the Federal Highway Administration and Washington State Department of Transportation. The document assesses changed conditions and effects across multiple environmental categories—including noise, air quality, water quality, wetlands, and transportation—comparing the current project phase against the 2003 Final Environmental Impact Statement's preferred alternative. Notably, the noise section evaluates both operational and construction-phase sound impacts on surrounding communities, making it a relevant reference for research into transportation-related noise policy near Sea-Tac Airport.Open full document
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This environmental re-evaluation, prepared by the SR 509 Program Team for FHWA and WSDOT, assesses changed conditions and effects for Phase 1 of the SR 509 Completion Project under the Puget Sound Gateway Program. The document evaluates transportation, air quality, noise, energy, geology, water quality, wetlands, and vegetation/wildlife impacts compared to the 2003 Final Environmental Impact Statement. It covers effects during both construction and operation phases, along with proposed mitigation measures.