U.S. awards contract for grout curtain at Wolf Creek dam and hydro project

The U.S. Army Corps of Engineers has awarded The Judy Company Inc., of Kansas City., Kan., a $6.76 million contract for installation of two grout curtains as part of emergency dam safety repairs to 270-MW Wolf Creek dam and hydropower project at Jamestown, Ky.

The Corps identified the earthfill and concrete gravity dam as being critically near failure or having extremely high life or economic risk. Money to repair the dam was included in economic stimulus appropriations approved by Congress. A 2008 assessment of equipment at nine Corps hydropower plants on the Cumberland in Tennessee and Kentucky, including Wolf Creek, found a need for up to $470 million in repairs.

The Corps awarded a $341.4 million construction contract for a 4,200-foot-long concrete seepage barrier at Wolf Creek to Treviicos Soletanche JV of Boston in 2008. The cutoff wall is the primary element of the seepage rehabilitation project. It is to be built deep into foundation rock beneath the 5,736-foot-long, 258-foot-tall dam to stop seepage. Work began in fall 2008; the contract performance period is four years.

The latest contract award involves installation of a grout curtain from the right end of the gallery to the base of the right abutment constituting a grout line of about 1,500 feet in length and about 140 feet deep. Also included is a separate grout curtain in the power plant plaza adjacent to an existing diaphragm wall. The 600-foot-long plaza grout curtain requires drilling and installing casing through about 70 feet of soil prior to constructing a 60-foot-deep grout curtain in rock.

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U.S. awards contract for replacement of trashracks at McNary Dam hydro project

The U.S. Army Corps of Engineers has awarded Kentucky-based Marine Solutions Inc. a $270,400 contract to replace trashracks at the 980-MW McNary Dam hydro project on the Columbia River in Oregon.

The Corps seeks removal of existing trashracks and supply and installation of eight new navigation lock intake trashracks. The trashracks are 13 feet by 16.5 feet and weigh 5.5 tons each.

In July, the Corps’ Walla Walla District awarded a contract to Triad Mechanical Inc. to replace traveling screens at McNary.

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