EXH 2090 (AR 033510): Annual Stormwater Monitoring RP STIA Jul 1, 1996–May 31, 1997

This 1997 Annual Stormwater Monitoring Report, prepared by Scott Tobiason of Port of Seattle Environmental Services, documents water quality data collected from Seattle-Tacoma International Airport's stormwater discharges between July 1, 1996 and May 31, 1997. The report analyzes discharge samples from stormwater outfalls across the airport's drainage basins, comparing results to regional and national benchmarks, and notes that improvements from newly installed Best Management Practices (BMPs) would be evaluated in the following year's report. It was submitted to the Washington Department of Ecology in fulfillment of Special Condition S.9 of the airport's NPDES permit.

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Annual Stormwater Monitoring Report (Exhibit 2090, AR 033510) for Seattle-Tacoma International Airport (STIA), covering the period July 1, 1996 through May 31, 1997. Prepared by Scott Tobiason, Port of Seattle Environmental Services, reviewed by Tom Hubbard. Submitted to Washington Department of Ecology (WDOE) pursuant to Special Condition S.9 of the NPDES permit. Report collects and analyzes stormwater data from STIA stormwater outfall discharges over four quarters, comparing water quality concentrations and unit loads to regional and national data. Includes data from quarterly and annual NPDES monitoring, Stipulated Agreement (Brasher et al., 1995), Stormwater Receiving Environment Study (SRES, Condition S.8), and runway deicing washoff study. Discusses Industrial Waste System (IWS), Industrial Waste Treatment Plant (IWTP), stormwater drainage basins, and capital BMPs instituted during the reporting period. Filed with Pollution Control Hearings Board (PCHB) as part of the Third Runway EIS administrative record.

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