Charleston Water System awards $50.8 million contract for sewer tunnel
Start of construction for the fifth and final phase of replacing the deep tunnel system that collects raw sewage — not street level storm water — and delivers it to Charleston Water System’s wastewater treatment plant will begin shortly.
Charleston Water’s Board of Commissioners recently approved a $50.8 million contract with Southland Renda JV, to build what is being called the new West Ashley Tunnel.
The project involves drilling a 1.6-mile-long, 120-foot-deep and 8-foot-in-diameter tunnel from Albemarle Road, under the Wappoo Cut, to the Plum Island Wastewater Treatment Plant off Harborview Road.
Along with a new pump station, piping and other improvements, the project is expected to take approximately 30 months to finish.
The new tunnel replaces an existing tunnel that currently carries wastewater from West Ashley, parts of Johns Island, and the Towns of Hollywood, Ravenel, and Meggett, the water company said.
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