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Sea-Tac Impact Mitigation Study: Section 1 Introduction and Section 1.02 Project Scope

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Sea-Tac Airport
Third Runway

This 1997 draft study assessed the potential environmental, transportation, and socioeconomic impacts of a proposed third runway at Seattle-Tacoma International Airport on five neighboring communities—Burien, Des Moines, Federal Way, Normandy Park, and Tukwila—as well as the Highline School District and Highline Community Hospital District. Funded by a Washington State grant administered through the City of Burien, the study was conducted by a team of consultants and aimed to develop mitigation strategies and funding mechanisms to address impacts on affected jurisdictions. The report reviewed the Port of Seattle's Environmental Impact Statement and proposed independent mitigation measures, while expressly prohibited from being used to oppose the runway's construction.

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Draft introduction and project scope section of the SeaTac Impact Mitigation Study, January 1997, funded by a State of Washington grant administered through the Department of Community, Trade, and Economic Development (CTED) and managed by the City of Burien. Assesses impacts of the proposed Seattle-Tacoma International Airport third runway (8,500 feet) on five communities — City of Burien, City of Des Moines, City of Federal Way, City of Normandy Park, City of Tukwila — plus Highline School District and Highline Community Hospital District. Consultants included Hellmuth, Obata + Kassabaum (HOK), Raytheon Infrastructure Services, Thomas/Lane Associates, and Michael J. McCormick AICP. Study scope covers environmental, transportation, socio-economic analysis, EIS review, and mitigation strategies including projected costs, funding mechanisms, and implementation oversight. Grant language explicitly prohibits use of funds to oppose third runway construction.

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