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AULtec, Inc. has provided services in subterranean or underground tunneling surveying/support services for the Washington Suburban Sanitary Commission (WSSC) 5.34-mile Bi-County Water Tunnel in Montgomery County, Maryland.

Existing ground Horizontal and Vertical Controls were checked for accuracy and consistency at various shaft sites and transferred approximately 150 feet underground by way of the shafts. Transferred controls were then extended into the tunnel, checked and validated for use by the Tunnel Boring Machine (TBM).

AULtec, Inc., also provided various above-ground and underground support services for the general contractor.