February 20, 2002August 2, 2026

EXH AR053454: Existing and Post Project Conditions Maps, Sheets 1–3 of 8 — Sea-Tac Airport Wetlands and Miller Creek

Notes

Parametrix-prepared maps (Sheets 1-3 of 8, AR 053454-053456, dated February 20, 2002) depicting existing and post-project conditions near Sea-Tac Airport, showing wetlands, impacted wetlands, impervious surfaces, stormwater detention facilities, stormwater vaults, mitigation area buffers, permanent impact areas, prior converted cropland, Miller Creek, parcel boundaries, permanent impact lines, MSE wall, and airport navigation aids. Maps cover the area around Miller Creek and the Third Runway project footprint. Scale in feet, north arrow included.

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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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