November 22, 1995August 2, 2026

EXH AR027698: Draft Amendments to Initial Watershed Assessment, Water Resources Inventory Area 9, Green-Duwamish Watershed

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Draft amendments prepared by Tom Culhane and Jerry Liszak of Washington Department of Ecology Northwest Regional Office, Water Resources Program, replacing text of OFTR 95-01 for the Initial Watershed Assessment of Water Resources Inventory Area 9 (WRIA 9), Green-Duwamish Watershed. Document covers hydrogeology, ground water-surface water interaction, water demand, streamflow status, water rights and claims for Soos Creek and Newaukum Creek subbasins, minimum flows per WAC 173-509, water quality, fisheries, City of Tacoma diversion, Hansen Dam, and USGS gages 12113000 (Green River near Auburn) and 12106700 (Green River near Palmer). Co-authors include Science Applications International Corporation, Shapiro and Associates, Taylor Associates, and Environmental Systems Research Institute.

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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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