June 23, 2023 377 pp.

This document is the Final Basis of Design Report for the expansion of the Industrial Wastewater Treatment Plant (IWTP) at Seattle-Tacoma International Airport, prepared by Gresham Smith in June 2023 for the Port of Seattle. It outlines the engineering and design framework for upgrading the airport's wastewater treatment infrastructure. The report was developed in collaboration with Anchor QEA, Clearway Environmental, and RKI Planning & Engineering.

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Final Basis of Design Report (Version 2.0) for the Seattle-Tacoma International Airport (SEA) Industrial Wastewater Treatment Plant (IWTP) Expansion, prepared by Gresham Smith (Project No. 44846.10) under Port of Seattle Contract No. P-00320039, dated June 23, 2023. Prepared in collaboration with Anchor QEA, Clearway Environmental, and RKI Planning Engineering. The report documents the engineering and design basis for expanding the IWTP at Sea-Tac Airport in Seattle, Washington.

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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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