May 29, 2001August 2, 2026

EXH AR016977: Ecology Letter to Port Of Seattle — NPDES Permit No. WA-002465-I Modification for STIA Construction Stormwater

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Washington State Department of Ecology Northwest Regional Office letter dated May 29, 2001, to Michael D. Feldman, Director of Aviation Facilities, Port Of Seattle, modifying NPDES Permit No. WA-002465-I for Seattle-Tacoma International Airport (expiration July 30, 2002). Modification authorizes discharge of construction stormwater to Walker Creek including tributaries and Gilliam Creek including tributaries; adds monitoring and reporting requirements and detention/retention impoundment design requirements. Signed by Kevin C. Fitzpatrick, Water Quality Section Manager. AR 016977–016979. Appeal period 30 days to Washington Pollution Control Hearings Board per Chapter 43.21B RCW.

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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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