Rondout West Branch Bypass Tunnel (BT-2)
The New York City Department of Environmental Protection (NYCDEP), Rondout-West Branch Bypass Tunnel project, is a roughly $1 billion program to repair leaks in the Delaware Aqueduct. Contract BT-2 picks up where Contract BT-1 left off. It includes mining and lining of the 2.5 mile bypass tunnel, build out of the shafts constructed under the previous contract, construction of new access chambers at each shaft, connection of the bypass tunnel to the existing aqueduct, and supporting site improvements to miscellaneous DEP facilities that will allow them to take the Delaware Aqueduct off-line for the connection phase.
On this program, HVEA serves as a sub-consultant to AECOM. AECOM oversees all concrete testing for the DEP and acts as third party quality assurance.
As part of their duties under this contract, HVEA performs concrete batch plant inspections, concrete / shotcrete field testing and laboratory testing of concrete cylinders and shotcrete cores in accordance with ACI procedures. HVEA also produces reports and maintains a database of test results to allow the Owner’s engineers to track concrete production and quality. HVEA also supplies Certified Weld Inspectors to verify the quality of the welds on the tunnel interliner. The steel interliner, which is part of the unique three-pass lining system, serves as the impermeable barrier for the pressurized tunnel and is arguably the most important component of the repairs to the leaky tunnel.