EPA Region 10 letter to FAA on air quality concerns for Sea-Tac Airport master plan EIS

In a June 1996 letter, the EPA's Region 10 office raised concerns about air quality impacts from the proposed Master Plan development at Seattle-Tacoma International Airport, noting that the Final Environmental Impact Statement contained only a draft conformity analysis that did not fully meet Clean Air Act requirements. The agency called for a comprehensive conformity analysis covering emissions forecasts through 2020, comparisons of 'no project' versus 'with project' air quality scenarios, and enforceable mitigation measures to prevent exceedances of National Ambient Air Quality Standards. EPA also urged that the Record of Decision include a cumulative impacts analysis and a long-term air quality monitoring program, coordinated with the Washington Department of Ecology and the Puget Sound Air Pollution Control Agency.

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EPA Region 10 supplements its March 18, 1996 comments on the Final Environmental Impact Statement for the Seattle-Tacoma International Airport Master Plan Update, raising concerns about air quality conformity with the State Implementation Plan under the Clean Air Act. The letter outlines requirements for a final conformity analysis including emissions modeling, ‘no project’ vs. ‘with project’ comparisons, and enforceable mitigation measures. EPA also expresses concern about cumulative air quality impacts from adjacent projects including the SR 509 extension and calls for a comprehensive monitoring program.

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