An aerial rendering depicting the SR 509 Expressway extension (Stage 1b) in SeaTac, Washington, showing planned infrastructure including a new 24th Avenue South interchange, new 34th Avenue S connection to I-5, a reconfigured S 208th Street, a toll point on SR 509, and proximity to the Sound Transit Angle Lake Station. The project corridor runs east-west connecting I-5 to existing SR 509 near Angle Lake.

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Aerial map showing planned SR 509 expressway construction from I-5 to 24th Avenue South, including new interchange ramps and reconfigured streets near SeaTac and Angle Lake areas. The map displays future construction stages, toll points, and connections to existing highways and Sound Transit stations.

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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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