Finding of no significant impactrecord of decision for the sustainable airport master plan near term projects at the seattle tacoma international airport page 1

Cover page of a U.S. Department of Transportation Federal Aviation Administration Northwest Mountain Region document titled 'Finding of No Significant Impact/Record of Decision' for the Sustainable Airport Master Plan Near-Term Projects at Seattle-Tacoma International Airport, Seattle, Washington. The document bears project number EAXX-021-12-ARP-17297535477 and is dated September 2025.

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SAMP FONSI ROD FAA’s Finding of No Significant Impact and Record of Decision for the Sustainable Airport Master Plan Near-Term Projects at Seattle-Tacoma International Airport. The document provides final agency determinations and approvals for federal actions necessary to implement 31 near-term improvement projects addressing efficiency, safety, and passenger processing needs at SEA.

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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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