July 13, 1999August 2, 2026

EXH AR042353: Evaluation of Retaining Wall/Slope Alternatives to Reduce Impacts to Miller Creek, Embankment Station 174+00 to 186+00, Third Runway, Sea-Tac International Airport

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Report AR042353 prepared by HNTB, Hart Crowser Inc., and Parametrix for Port Of Seattle Aviation Program Management Group, evaluating retaining wall and slope alternatives to reduce impacts to Miller Creek at embankment station 174+00 to 186+00 for the Third Dependent Runway project at Sea-Tac International Airport. Transmitted July 13, 1999 by Barbara Hinkle to Tom Walsh at Foster Pepper & Sheffleman for review and approval, with goal of initiating permit renotice by August 6, 1999. Distribution list includes U.S. Army Corps of Engineers (Jonathon Freedman), Department of Ecology (Erik Stockdale, Tom Luster, Ray Helwig, Kevin Fitzpatrick), FAA (Cayla Morgan), USFWS (Nancy Brennan-Dubbs), USDA Wildlife Services (Roger Woodruff), King County (David Masters), WA Dept. of Fish and Wildlife (Phil Schneider), and U.S. EPA (Steve Roy). Mechanically stabilized earth retaining wall shown in cover photo.

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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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