November 1, 1998August 2, 2026

Exhibit 2089: Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport, June 1997–June 1998

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Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport (STIA) covering the period June 1, 1997 through June 30, 1998, prepared by Port of Seattle, received by Washington State Department of Ecology on December 1, 1998 (AR 033384). Report covers stormwater sampling results from airport subbasins including SDN2, SDS1, SDE4, and Taxi Yard; analytes include fats/oils/grease (FOG), total petroleum hydrocarbons (TPH), fecal coliforms, suspended solids, turbidity, biochemical oxygen demand (BOD5), ammonia, surfactants, metals, and deicing event samples. Includes assessment of Best Management Practices (BMPs), pollutant source tracing for subbasin SDE4, runway skid mark material removal, NPDES permit compliance, and stormwater quality comparators. Exhibit 2089, Administrative Record AR 033384.

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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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