November 29, 2000August 2, 2026

EXH AR046207: Subsurface Conditions Data Report, Phase 4 Fill, Third Runway Embankment, Sea-Tac Airport

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Draft Subsurface Conditions Data Report for Phase 4 Fill of the Third Runway Embankment at Sea-Tac International Airport, prepared by Hart Crowser (HartCrowser) for Port of Seattle and HNTB, dated November 29, 2000, project J-4978-28, AR 046207. Report covers generalized geologic conditions, subsurface soil conditions, hydrogeologic conditions, field exploration methods including auger borings, Standard Penetration Tests (SPT), Shelby tubes, test pits, piezocone penetrometer probes, and cone penetration tests. Appendices include boring logs (HC99-B58 through HC00-B306), test pit logs (HC98-TP3 through HC00-TP305), cone penetration probe log HC99-P07, and laboratory testing including grain size analysis, Atterberg limits, triaxial unconsolidated undrained compression tests (TUU), triaxial consolidated undrained compression tests (TCU), and direct shear tests (DS).

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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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