Letter from FAA Northwest Mountain Region to EPA Region 10 regarding air quality conformity for Sea-Tac Airport Master Plan Update

A July 1996 letter from the FAA's Northwest Mountain Region to EPA Region 10 Administrator Chuck Clark addresses air quality general conformity issues related to proposed Master Plan improvements at Seattle-Tacoma International Airport. The FAA outlines three options for demonstrating conformity, including emissions inventories and hot spot evaluations, and responds to EPA questions about construction emissions, fuel type assumptions, and cumulative traffic impacts at nearby intersections. The letter concludes that the proposed improvements would not create new exceedances of national ambient air quality standards, and requests EPA confirmation before proceeding with a final conformity determination.

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A letter from Lowell H. Johnson, Manager of the FAA Airports Division for the Northwest Mountain Region, to Chuck Clark, Regional Administrator of the U.S. EPA Region 10, seeking clarification on air quality general conformity issues for proposed improvements at Seattle-Tacoma International Airport. The letter addresses options for demonstrating general conformity, construction emissions, hot spot evaluations, fuel type assumptions, and cumulative impact analysis. The FAA requests EPA confirmation on several points including the applicability of EPA’s construction comments and the validity of their approach to surface transportation analysis.

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