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William A. Rozeboom, a professional civil engineer with Northwest Hydraulic Consultants, declares his qualifications and findings regarding stormwater and low flow impacts from the Port of Seattle’s Third Runway Project at Sea-Tac Airport. He details that while the July 2001 Stormwater Management Plan addresses peak flow mitigation, it fails to adequately assess or mitigate reductions in low streamflows in Miller Creek, Walker Creek, and Des Moines Creek during the late summer period. The declaration was submitted in support of the Airport Communities Coalition’s motion for stay before the Pollution Control Hearings Board.

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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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