Attachment to the Environmental Protection Agency Air Quality Comments on the Proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport

This 1996 EPA Region X document provides air quality comments on the proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport, outlining Clean Air Act conformity requirements that federal agencies must meet when conducting projects in non-attainment or maintenance areas. It highlights inconsistencies found across multiple environmental impact statements for nearby projects, including conflicting carbon monoxide modeling results at key intersections near the airport. The EPA calls for better coordination and data sharing among project leads to ensure consistent and comprehensive cumulative air quality impact analyses.

Notes

EPA Region X comments on the Final EIS for the Seattle-Tacoma International Airport Master Plan Update, focusing on general conformity requirements under the Clean Air Act. The document outlines conformity determination requirements, mitigation measures under Section 93.160, and identifies inconsistencies in air quality modeling results across multiple related EIS documents for nearby projects.

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