December 8, 2000August 2, 2026

EXH AR029093: Sea-Tac Airport Third Runway 401 Permit Negotiations Meeting Notes Summary, October–December 2000

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Floyd & Snider Inc. meeting notes summary covering Sea-Tac Airport Third Runway 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology), October 2 through December 8, 2000. Documents master list of 401 Permit technical issues including Stormwater Master Plan detention sizing, basin acreage discrepancies, HSPF and KCRTS hydrological models, IWS pump station modeling, Walker Creek calibration, Des Moines Creek Basin Plan consistency, flow augmentation for Des Moines Creek, Natural Resources Mitigation Plan (NRMP), wetlands 18/37/39B hydrology, SASA facility volumes, King County off-site flow criteria, Borrow Site #3 hydrology, runway de-icing/dissolved oxygen study, SR 509 interchange impacts, aquitard breaches, contaminated soil stockpile facility, NEPA/SEPA revision timing, and Kludt settlement compliance. AR 029093, ECY00019049.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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