June 25, 2001August 2, 2026

EXH AR029190: 401 Permit Decision-Making, Sea-Tac Airport Third Runway — Final Meeting Notes, Low Flow Analysis, June 25, 2001

Notes

Final meeting notes prepared by Kate Snider of Floyd & Snider Inc. for the 401 Permit Decision-Making process for the Sea-Tac International Airport Third Runway project, covering Low Flow Analysis discussions held June 25, 2001. Attendees included representatives from Washington State Department of Ecology (Ann Kenny, John Drabeck), King County (Kelly Whiting), Port of Seattle (Keith Smith), Parametrix (Paul Fendt, Robert Farid), EarthTech (Rick Schaefer), Foster Wheeler (Felix Kristanovich), and Pacific Groundwater Group (Pony Ellingson). Topics covered: 7-day low stream flow impact methodology using HSPF modeling, pre- and post-project (2006) flow comparisons, vault filling estimates, Hydrus/slice model status, non-hydrologic effects, operational plan for low-stream flow mitigation, and expectations for July 9 follow-up meeting. ECY00014993–ECY00014995.

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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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