This 1987 Draft Environmental Impact Statement from the Puget Sound Council of Governments evaluates alternatives for expanding and managing the regional airport system through the year 2020, assessing their potential environmental and economic impacts. The study found that all alternatives would generate significant impacts to both natural and human environments, with the key difference being whether those impacts would be concentrated at existing airports or spread across new locations. Extensive mitigation measures were identified as necessary for any chosen alternative, and no single option was found to be clearly superior to the others.Open full document
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A Nonproject Environmental Impact Statement prepared by the Puget Sound Council of Governments in December 1987, describing potentially significant environmental impacts from implementing regional airport alternatives in the Puget Sound region. The document summarizes the update of the Regional Airport System Plan (RASP), extending its planning horizon from 2000 to 2020, and evaluates alternatives for providing airport facilities while mitigating operational impacts. No single alternative was found to be clearly superior, and extensive mitigation measures were deemed necessary.