Notes

Hart Crowser, Inc. geotechnical summary report prepared for the Port of Seattle for presentation to the U.S. Army Corps of Engineers (Seattle District), dated November 2, 2001, project number 4978-06. Covers design of the Third Runway embankment and three mechanically stabilized earth (MSE) retaining walls (50–135 feet height) at Seattle-Tacoma International Airport (STIA). Addresses 17,000,000 cubic yards of compacted fill, 3,000,000 cubic yards of excavation, soil conditions, groundwater, seismic hazards, earthquake risk, slope stability, and construction mitigation measures. Signed by Project Manager Michael Bailey, P.E. (Washington State license 22484). Includes independent technical review board involvement.

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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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