Corps to issue seepage barrier tender for 135-MW Center Hill

The U.S. Army Corps of Engineers is preparing to issue a solicitation for construction of a concrete seepage barrier at the main embankment of 135-MW Center Hill Dam on the Caney Fork River near Lancaster, Tenn. Bids are expected to be due April 23, 2010.

A solicitation is expected to be issued about Feb. 22 for the work at Center Hill, which has a history of seepage problems that have worsened in recent years. (HydroWorld 12/7/09) The Corps’ Nashville District awarded an $87.4 million contract in 2008 to Kiewit–A.C.T. to install a grout curtain seepage barrier at the project.

The 250-foot-tall dam consists of a 1,382-foot-long concrete section and 778-foot-long earth embankment. The Corps said the expected solicitation would call for a 900-foot-long concrete seepage barrier with a minimum 2-foot thickness, extending from elevation 696 mean sea level to 405 msl. The work is expected to cost between $100 million and $250 million.

The barrier is to be installed through existing earthen embankment and underlying limestone foundation. Portions of the limestone foundation exhibit unconfined compressive strengths up to 32,230 pounds per square inch, with range of 5,000 psi to 32,230 psi. Therefore the Corps prefers a combined wall of hydromill and circular pile elements.

Center Hill Dam is among six dams the Corps identified as having a high risk of failure, in a screening program of 130 dams. In 2006, the Corps approved a $240 million rehabilitation plan to improve the dam’s long-term reliability by 2014.

A pre-solicitation notice may be obtained from the Federal Business Opportunities Internet site, www.fbo.gov, by entering Solicitation No. W912P509R0011 in the “Keyword/Solicitation #” box. Prospective bidders must register at the Central Contractor Registration database, www.ccr.gov, and the On-line Representations and Certifications site, https://orca.bpn.gov.

For information, contact Yvette Walker, U.S. Army Engineer District, Nashville, P.O. Box 1070, 801 Broad St., Nashville, TN 37202-1070; (1) 615-736-7944; E-mail: yvette.walker@usace.army.mil.

Corps to seek control cable replacement at Center Hill

The Corps’ Nashville District also plans to seek bids for control cable replacement at Center Hill. Bids are expected to be due March 15.

The agency seeks installation of temporary control cables for one generator; replacement of control and low-voltage power cables, switchyard portion of control cable conduits, and cable trays; and sealing of seepage cracks that run through the spread room, control cable tunnel, and power cable tunnel.

A pre-solicitation notice may be obtained from the Federal Business Opportunities Internet site, www.fbo.gov, by entering Solicitation No. W912P510R0008 in the “Keyword/Solicitation #” box.

Bids are expected to be due March 15. For information, contact James Choate, U.S. Army Engineer District, Nashville, P.O. Box 1070, 801 Broad St., Nashville, TN 37202-1070; (1) 615-736-7946; E-mail: james.e.choate@LRN02.usace.army.mil.

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