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Final report prepared by S.S. Papadopulos & Associates, Inc. for Port Of Seattle, dated February 15, 2002, analyzing water quality and contaminant transport from embankment fill materials used in the Seattle-Tacoma International Airport Third Runway construction. AR 053402. Covers embankment fill soil criteria, water-quality criteria, chemical analysis of soils, adsorption capacity, Synthetic Precipitation Leaching Procedure (SPLP), and numerical modeling of groundwater flow and contaminant transport for fill sites including Hamm Creek, First Avenue Bridge, and Black River Quarry. Model parameters include hydraulic conductivity, dispersivity, retardation, and sensitivity analysis simulations.

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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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