December 8, 2000August 2, 2026

EXH AR029120: Sea-Tac Airport Third Runway 401 Permit Negotiations — Meeting Notes Summary (Wetland Issues Only), October–December 2000

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Floyd & Snider Inc. meeting notes summary covering 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology) regarding the Sea-Tac Airport Third Runway and Stormwater Master Plan Update, October 2 through December 8, 2000. Document covers wetland issues only and includes a master list of 401 technical issues with resolution status. Key topics include detention sizing, basin acreage discrepancies, HSPF and KCRTS stormwater models, IWS pump station modeling, Des Moines Creek flow augmentation, Walker Creek calibration, wetlands 18/37/39B hydrology maintenance, Natural Resources Mitigation Plan (NRMP) consistency, Borrow Site #3, Tyee Pond, SR 509 interchange impacts, runway de-icing/dissolved oxygen study, Kludt settlement compliance, and King County off-site flow criteria. Administrative Record numbers AR 029120–AR 029122, ECY00012496–ECY00012498.

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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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