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Attachment C summarizing proposed mitigation actions to avoid and minimize wetland impacts for a runway project at Sea-Tac Airport area. Document details mitigation requirements and actions for Miller Creek, Des Moines Creek, Category II and III wetlands (Wetlands 3, 4, 5, 8, 9, 18, 37, 44, 52, A1, and Borrow Area wetlands B1, B4–B10, B15a, B15b, 29, 30, 48), including retaining wall construction, 150–200 ft setbacks from Des Moines Creek, stormwater pollution prevention plans (SWPPPs), TESC Plans, SASA footprint design, South 154th Street relocation, and Best Management Practices (BMPs). AR 034995–034996.

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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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