December 1, 2001August 2, 2026

Low streamflow analysis and summer low flow impact offset facility proposal: Seattle-Tacoma International Airport master plan update improvements

Notes

This report, prepared for the Port of Seattle by Parametrix and associated consultants, analyzes low streamflow conditions associated with the Seattle-Tacoma International Airport Master Plan Update Improvements. It includes hydrologic modeling, assessment of embankment and non-hydrologic impacts to nearby creeks during summer low-flow periods, and proposes mitigation through a flow impact offset facility. The report also covers water quality design, operation and maintenance planning, and a monitoring plan for biological and water quality outcomes.

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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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