October 22, 2001August 2, 2026

EXH AR052175: Subsurface Conditions Data Report — Haul Route and Borrow Areas 3 and 4, Third Runway Project, Sea-Tac International Airport

Notes

Hart Crowser, Inc. subsurface conditions data report prepared for HNTB, project number 4978-52, dated October 22, 2001, covering the haul route and Borrow Areas 3 and 4 for the Third Runway Project at Sea-Tac International Airport, Seatac, Washington. Report by Reese P. Hastings (Senior Associate) and Joe N. Morrice (Senior Staff Hydrogeologist) covers generalized geologic conditions, subsurface soil conditions, hydrogeologic regime, groundwater elevation contour maps, soil infiltration characteristics, and dual-wall percussion hammer drilling with reverse circulation. Includes tables of Borrow Area 3 and 4 water level data and summary of infiltration tests. AR 052175.

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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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