A construction crew now is set to bore a massive tunnel near the Seekonk River in Pawtucket, R.I. in the third and final phase of Rhode Island’s “Big Dig.” The $1.5-billion Narragansett Bay Commission Combined Sewer Overflow (CSO) program is the largest single public works project in state history.
CB3A—a joint venture of contractors CBNA, a U.S. unit of French giant Bouygues and Barletta Construction LLC, Canton, Mass., with AECOM—are collaborating on the estimated $450-million design-build contract to be completed by 2027. Smaller components of this phase, which began last month, include an interceptor gate and screening structure, and will continue until 2041, according to a spokeswoman at Stantec, the lead designer and program manager for the final phase.