April 24, 2023August 1, 2026

Puget Sound Gateway Program: Phase 1, Stage 2 of the SR 509 Completion Project NEPA/SEPA Environmental Reevaluation form

South Access Road Section 4(f)

Notes

This Environmental Reevaluation assesses how recent design revisions for the SR 509/24th Avenue South to South 188th Street New Expressway (SR 509 Stage 2) Project affect the natural and built environment. Key changes include roundabouts at interchange ramp terminals, a shortened bridge over Wetland 23.05, revised stormwater facility locations, and modifications to the I-5 southbound auxiliary lane. The reevaluation concludes that these changes would not result in new significant adverse effects compared to the 2003 Final EIS, 2003 ROD, and subsequent reevaluations.

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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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