' Owner: U.S. Army Corps of Engineers, Seattle District ' Technique(s) Utilized: Diaphragm Wall, Grouting PROJECT CASE STUDY or the rehabilitation of this earth dam, a dia- phragm cutoff wall was constructed through the center of the dam. The diaphragm wall was installed to depths reaching approximately 400 feet, a re- cord depth in the United States at the time. The diaphragm wall, which consisted of 55 panels, was constructed with a

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