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Pre-filed testimony of Keith Malcolm Leytham, Professional Civil Engineer and Professional Hydrologist with Northwest Hydraulic Consultants (nhc), submitted on behalf of appellant Airport Communities Coalition (ACC) in PCHB No. 01-160, ACC & CASE v. Dept. of Ecology & Port Of Seattle, dated February 22, 2002. Leytham testifies regarding stormwater facilities, streamflow impacts, surface water hydrology, hydrologic modeling, and the proposed 3rd runway fill embankment at Sea-Tac Airport. NHC retained by ACC since October 1999; review includes work by colleague Bill Rozeboom and covers hydrologic model development, calibration, and surface water hydrologic response of the proposed 3rd runway embankment under the Port of Seattle Master Plan Update Improvements.

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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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