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Exhibit 429: Annual Stormwater Monitoring Report for Seattle-Tacoma International Airport, July 1, 2000 through June 30, 2001

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Sea-Tac Airport
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This report, prepared by the Port of Seattle in September 2001, presents the findings of annual stormwater monitoring conducted at Seattle-Tacoma International Airport for the period July 1, 2000 through June 30, 2001. It covers water quality sampling results for pollutants including petroleum hydrocarbons, fecal coliforms, suspended solids, metals, and deicing-related contaminants collected from the airport's storm drainage system. The report documents sampling locations, storm events analyzed, and outfall inspections aimed at assessing the airport's environmental impact on surrounding waterways.

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Exhibit 429 (AR 022631–022633), prepared by Scott Tobiason, Environmental Management Specialist, Aviation Environmental Programs, Port of Seattle. Annual NPDES stormwater monitoring report for Seattle-Tacoma International Airport (STIA) covering the period July 1, 2000 through June 30, 2001. Report covers STIA storm drainage subbasins, sampling locations, grab and composite sample results for total petroleum hydrocarbons (TPH), fecal coliforms, suspended solids, turbidity, biochemical oxygen demand (BOD5), and metals; deicing event samples including ethylene glycol; source tracing studies; outfall inspections; and field quality control samples. Filed in PCHB (Pollution Control Hearings Board) proceedings related to the Sea-Tac Airport Third Runway EIS.

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