November 1, 1999August 2, 2026

EXH AR041945: Des Moines Creek Regional Capital Improvement Project Preliminary Design Report — Alternative Analysis Addendum

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Addendum to the Des Moines Creek Regional Capital Improvement Project Preliminary Design Report, prepared November 1, 1999 by King County Capital Improvement Project Design Team for the Des Moines Creek Basin Committee. Prepared for Tim Heydon (City of Des Moines), Tom Hubbard (Port Of Seattle), David Masters (King County), Don Monaghan (City of SeaTac), and Loren Reinhold (City of Des Moines). Approved by Don Althauser, P.E. Document AR 041945 covers hydrologic evaluation, flood inundation areas (1-year, 10-year, 25-year, 100-year), typical water year analysis (1995 mean daily discharge and water surface elevations), storm events, Northwest Ponds stage-area graphs, Swanson Site observations, and Tyee Golf Course winter flood events.

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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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