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Northwest Hydraulic Consultants, retained by the Airport Communities Coalition (ACC), submits technical comments to the Washington State Department of Ecology on the Port of Seattle’s July 23, 2001 Low Flow Analysis Flow Offset Facility Proposal related to the proposed 3rd runway development at Sea-Tac Airport. The letter identifies the document as an incomplete draft with missing sections, inconsistencies with the Stormwater Management Plan, unaddressed transit losses, and poor HSPF model calibration for Walker Creek. The consultants conclude that the proposal fails to provide adequate assurance that impacts to low streamflows will be sufficiently mitigated.

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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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