February 1, 1999August 2, 2026

EXH AR041921: Water Effect Ratio Screening Study at Seattle-Tacoma International Airport: Toxicity Evaluation of Site Water

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Draft report (AR 041921) prepared by Parametrix, Inc. for Port Of Seattle, STIA, summarizing procedures and results of acute screening-level Ceriodaphnia dubia bioassays conducted on site water from Seattle-Tacoma International Airport in January 1999. Samples collected January 14, 1999 during a storm event at eight locations including Miller Creek Upstream of Lake Reba, Miller Creek Downstream at 8th Ave S., Lake Reba Outfall to Miller Creek, Walker Creek at SR509, East Branch Des Moines Creek at fork, West Branch Des Moines Creek near fork, STIA Outfall SDS-3 (005), and City of Sea-Tac Storm Outfall to NW Ponds. Study conducted to provide screening-level toxicity information in anticipation of formal water effect ratio (WER) tests to set site-specific water quality standards. Analytical chemistry provided by Aquatic Research Incorporated, 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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