September 26, 2001August 2, 2026

EXH AR052045: Geotechnical Engineering Analyses and Recommendations, Third Runway Embankment, Phase 5, Sea-Tac International Airport

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Draft geotechnical engineering report prepared by Hart Crowser, Inc. for HNTB regarding the Third Runway Embankment, Phase 5 at Sea-Tac International Airport, SeaTac, Washington (project no. 4978-28, AR 052045). Authored by Josepha D. Celes (Senior Staff Geotechnical Engineer) and Michael Bailey, P.E. (Project Manager). Covers site preparation, subgrade improvement, embankment fill construction, TESC Pond A, subsurface soil and groundwater conditions in Work Area West and Work Area South 2, soil gradations for embankment fill material groups, sheet pile barriers, and mechanically stabilized earth.

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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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