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Final Supplemental EIS, Appendix F: DSEIS Response to Comments — Forecasts, Do-Nothing/With Project Capacity, and Forecast Ranges

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This document is part of the Final Supplemental Environmental Impact Statement for Seattle-Tacoma International Airport, addressing public comments on aviation demand forecasts and runway capacity planning. It explains how the 'Do-Nothing' and 'With Project' (Third Runway) alternatives were evaluated based on projected passenger and operations data through 2010, noting that the existing airfield has a maximum capacity of 460,000 annual operations. The document also acknowledges the inherent uncertainty in long-range aviation forecasts and clarifies that neither NEPA nor SEPA require the use of worst-case data in environmental reviews.

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Appendix F of the Seattle-Tacoma International Airport Final Supplemental Environmental Impact Statement (FSEIS), containing DSEIS responses to public comments on aviation demand forecasts, fleet mix, Do-Nothing versus With Project activity levels, and forecast ranges. Addresses comments by Ms. Brown, Mr. Klug, Mr. Hoggard, Mr. Rosen, Mr. Kirsch, and Mr. Bader. Discusses theoretical maximum capacity of Sea-Tac’s existing airfield (460,000 annual operations), Third Runway ultimate capacity (630,000 annual operations), NEPA and SEPA worst-case data requirements, FAA TAF, P&D Aviation December 1996 forecast data, Stage 2 aircraft phase-out, and the Port of Seattle Master Plan Update planning horizon through 2010. Cites Richard DeNeufville paper for MASSPORT on forecast uncertainty.

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