September 15, 2000August 2, 2026

Exhibit AR026129: King County Letter to Washington State Department of Ecology Regarding Port Of Seattle Comprehensive Stormwater Management Plan Review

Notes

Letter dated September 15, 2000 from Pam Bissonnette, King County Department of Natural Resources, to Tom Luster at Washington State Department of Ecology Shorelands & Environmental Assistance Program. Reviews Port Of Seattle Comprehensive Stormwater Management Plan (SMP) for Master Plan Update Improvements at Sea-Tac Airport against the 1998 King County Surface Water Design Manual. Addresses water quality treatment BMPs, flow control, erosion and sediment control, hydrologic models for three stream systems, and recommends a joint compliance team. Notes inconsistencies between SMP analytical appendices and proposed mitigation measures, generally erring toward under-mitigation. AR 026129.

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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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