October 24, 2001August 2, 2026

Exhibit AR026132: Port Of Seattle Letter to Department of Ecology Regarding Low Streamflow Analysis Modeling Error and Deadline Extension Request

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Letter dated October 24, 2001 from Keith R. Smith, Water Resources Manager, Port Of Seattle, to Ann Kenny, Department of Ecology Northwest Regional Office, regarding Water Quality Certification #1996-4-02325 (Amended-1) for the Seattle-Tacoma International Airport Master Plan Update. Discloses a modeling error discovered in HSPF/Hydrus/Slice models where data transfer between Slice and HSPF models caused double application of daily-to-hourly unit conversion, resulting in modeled embankment flow being 1/24 of correct value. Error caused overestimation of impacts to Miller Creek and Walker Creek summer low flows. Port requests extension of submittal deadline from November 5, 2001 to November 21, 2001 pursuant to Section C.4 of the Water Quality Certification. AR026132.

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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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