December 2, 1999August 2, 2026

EXH AR026984: Ground Water Flow Map – C1 Aquifer, Ground Water Study, Seattle-Tacoma International Airport

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Ground Water Flow Map for the C1 Aquifer prepared by Associated Earth Sciences, Inc. (project no. 8V07019, figure 7) as part of a Ground Water Study at Seattle-Tacoma International Airport, dated 12/02/99. The map covers the Sea-Tac Airport area including Normandy Park, City of SeaTac, Tukwila, Des Moines, and surrounding Puget Sound shorelines. Shows ground water elevation contours at 10 ft intervals (ranging from approximately 150 to 400 ft), ground water flow direction arrows, inferred ground water divides, data points including Ecology data points, control points, and areas of zero modelled C1 Aquifer thickness (shown in yellow). Notable features include Arbor Lake, Tub Lake, Lake Burien, Bow Lake, Angle Lake, Arrow Lake, Miller Creek, and Des Moines Creek. AR number 026984.

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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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