Oscar Renda Contracting » projects » Large-diameter Pipelines & Tunnels

Bi-County Water Tunnel

Location: MD


Owner: Washington Suburban Sanitary Commission


Contract Amount: $112,545,414.00



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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