July 1, 1998August 2, 2026

EXH AR033659: Preliminary Comprehensive Stormwater Management Plan for Sea-Tac Airport Master Plan Improvements — Appendix F: Stormwater Quality Management Plan

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Draft Stormwater Quality Management Plan (Appendix F) prepared by Parametrix, Inc. for Port Of Seattle, July 1998, as part of the Preliminary Comprehensive Stormwater Management Plan for Sea-Tac Airport Master Plan Improvements. Covers existing drainage conditions including Storm Drain System (SDS) and Industrial Waste System (IWS), Miller Creek and Des Moines Creek receiving systems, existing Best Management Practices (BMPs), stormwater quality data for Outfall SDS-3, proposed BMP alternatives (biofiltration swales, wet vaults, wet ponds, sand filters), reasonable potential analysis for pollutants of concern, BMP effectiveness and effluent pollutant concentrations, and preferred alternatives for Third Runway and taxiway areas. Received by Washington State Department of Ecology February 2002. AR 033659, Exhibit-2095.

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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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