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 document provides air quality comments on the proposed Master Plan Update Development Actions at Seattle-Tacoma International Airport, focusing on Clean Air Act conformity requirements. It explains that federal agencies must determine that proposed projects will not cause or worsen air quality violations in non-attainment or maintenance areas, and outlines enforceable mitigation measures required when pollution increases are modeled. The document also flags inconsistencies in projected CO emissions across multiple related EIS studies for nearby projects, recommending better data sharing and coordination among agencies.

Notes

EPA comments on the Final EIS for the Seattle-Tacoma International Airport Master Plan Update, addressing General Conformity requirements under the Clean Air Act. The document discusses conformity provisions, mitigation measures, and inconsistencies in projected air quality modeling results across multiple related EIS documents for nearby projects. EPA recommends improved coordination and data sharing between project leads to ensure consistent cumulative air quality impact analysis.

V V