SR-509

Aerial rendering showing the planned SR 509 Expressway extension (Stage 1b) connecting I-5 to 24th Avenue S. in the SeaTac/Kent area of Washington State. The image labels key project elements including the new SR 509 Expressway alignment, a toll point near S. 208th St, southbound and northbound SR 509 ramps, a southbound I-5 off-ramp, 24th Ave S. interchange ramps, a future light rail corridor, and the S. 216th St overpass.

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Aerial view map showing the SR 509 expressway construction project from I-5 to 24th Avenue S, including interchange ramps, toll points, and future light rail connections. The map displays the Kent area with various residential neighborhoods and commercial facilities including SeaTac airport vicinity.

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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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