TBM Excavation of 27,600 lf of 120-inch diameter deep rock tunnel through bedrock at depths ranging from 180 to 300 feet deep. Installation, welding and backfill grouting of 84-inch diameter steel water main. Construction of three shafts. Launch shaft - 40 ft diameter, 180 ft deep. Intermediate shaft -16 ft diameter, 150 ft deep. Retrieval shaft - 25 ft diameter, 125 ft deep.
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