January 31, 2000August 2, 2026

EXH AR044092: Memorandum — Response to Ecology Comments on Conceptual Flow Model Boundary Presentation, Ground Water Study, STIA

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Memorandum BV97016D dated January 31, 2000, from John Strunk (Associated Earth Sciences Inc.) and Mike Riley (S.S. Papadopulos & Associates, Inc.) to Roger Nye, Department of Ecology, responding to nine Ecology comments on the Conceptual Flow Model Boundary Presentation for the Seattle-Tacoma International Airport ground water study. Topics addressed include MODFLOW model setup covering approximately 36 square miles with constant head boundaries along Puget Sound and Duwamish River Valley, steady-state vs. transient simulation justification, C1 and C2 aquifer hydraulic conductivity data from slug tests, MT3D and PATH3D graphic outputs, C1 discharge zones into Miller Creek and Des Moines Creek, and interpretation of wells 22N4EC1 and 22N4E4N1 as C3 aquifer completions. CC to Paul Agid (Port Of Seattle) and Mike Staton (Maul Foster & Alongi, Inc.).

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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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