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Combined Sewer Overflow Control Program, Project No. 4 and No. 5

Tunnel Expert Advice Services
Estimated cost: Commencement:
August 31, 2000
Completion date:
October 22, 2002
Richmond, VA
United States
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.

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:
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