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Combined Sewer Overflow Control Program, Project No. 4 and No. 5
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| Service: | Tunnel Expert Advice Services
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| Estimated cost: | Commencement: | August 31, 2000
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Completion date: | October 22, 2002
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| Location: | Richmond, VA United States |
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| Technical data: | Provided tunnel expert advice during the excavation and support of an 18 ft diameter 5,500 ft long TBM driven tunnel. Support Type A (80%) with rock bolts and Type B (20%) with ring steel and lagging. Final lining with rein-forced cast-in-place concrete. |
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| Geology description: | Light gray to medium gray slightly to moderately weathered Petersburg Granite (quartz, hornblende, biotite); dark grayish, slicken-sided Amphibolite layers (biotite, hornblende, feldspar). |
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| Bid cost: | Final cost: | $30,000,000
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