The Corps of Engineers awarded a $341.4 million contract for construction of a concrete seepage barrier at 270-MW Wolf Creek Dam, on the Cumberland River near Jamestown, Ky.
The Corps’ Nashville District selected Treviicos Soletanche JV of Boston, from proposals submitted in response to a solicitation. (HNN 4/2/08) The agency announced the award July 23.
The barrier wall, also called a cutoff wall, is the primary element of the Wolf Creek Dam Seepage Rehabilitation Project. It will be built deep into foundation rock beneath the dam to stop seepage, the Corps said.
Treviicos Soletanche is to install the two-foot-thick barrier, which will have a total surface area of about 980,000 square feet, between two grout curtains. The wall will extend about 4,200 feet along the upstream embankment from the dam’s concrete section to the right abutment. As part of the construction work, Secant piles and rectangular panels will be installed through the earthen embankment to a depth of about 275 feet.
The contract award is larger than the Corps’ previous estimates for the cutoff wall of $100 million to $250 million. The Corps revised its projection to say it expected the project would cost between $200 million and $500 million. Work is expected to begin this fall. The contract performance period is four years, the Corps said.
Wolf Creek is one of several dams identified by the Corps as being critically near failure or having extremely high life or economic risk. An independent review panel agreed the 5,736-foot-long, 258-foot-tall, earthfill and concrete gravity dam has a significant potential for failure.