August 19, 1998August 2, 2026

EXH AR041760: Miller Creek Enhancement Program — Seattle-Tacoma International Airport Master Plan Update Improvements

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Draft report prepared by Parametrix, Inc. for Port of Seattle regarding the Miller Creek Enhancement Program associated with Seattle-Tacoma International Airport Master Plan Update Improvements. Document AR 041760 covers Miller Creek relocation and enhancement, floodplain compensation, floodplain enhancement, Lora Lake buffer enhancement, and Miller Creek riparian buffer enhancement. Includes ecological assessment of Miller Creek (fish habitat, stream rating, water quality), wetland delineations of the Vacca Farm Site (forested wetland complex, scrub-shrub, emergent wetland, prior converted croplands, farmed wetlands), mitigation approach, performance standards, and description of proposed wetland impacts and mitigation actions. Project number 55-2912-01 (03).

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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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