• Town of Collierville, Tennessee
• City of Winchester, Kentucky
• City of Alcoa, Tennessee
• Harpeth Valley Utility District
• Morehead Utility Plant Board
• City of Elizabethton, Tennessee

Contract 1 - Water Intake and Treatment Facilities

Owner

Morehead Utility Plant Board
135 South Wilson Avenue
Morehead, Kentucky 40356
Mike Nickell
(606) 784-5538

Engineer

Commonwealth Technology
2526 Regency Road
Lexington, Kentucky 40503
John Larue, P.E.
(859) 276-3091

Contract Amount

$6,597,715.00

Year Completed

2002

Raw Water Intake for this project is part of the overall water treatment plant expansion. The intake value is approximately $875,000.00. The intake facilities consist of two 24-inch diameter ductile iron lines extending approximately 75 feet from the raw water intake wetwell into the Licking River. The face of the cast-in-place wetwell is located approximately 15 feet from the edge of the river at normal pool. The wetwell portion of the intake is approximately 17 feet x 25 feet deep with an attached valve vault approximately 15'-6" x 24'-0" x 12'-0" deep. Additionally the back corner of the valve vault is located approximately 40 feet from the easement of a busy state highway. The roadway elevation of the highway is approximately 25 feet above the top of slab elevation of the valve vault.

Working with permission of the U.S. Army Corps of Engineers, W. Rogers Company placed rip rap and polyethylene sheeting in portions of the Licking River to seal off the water in the areas where the intake lines were laid. The invert of the intake lines ranged from 6 feet to 11 feet below normal pool and 4 feet to 7 feet below the stream bottom profile. Dewatering was accomplished with the use of multiple diesel powered centrifugal pumps that discharged to silt ponds prior to returning to the Licking River. Silt booms were placed in the Licking River to mitigate any sediment leaching from the point of excavation.

Excavation of the pump station was accomplished using an engineered cofferdam and retention system constructed of steel beams, channels and oak planking. In addition to retaining sandy soils around the intake, W. Rogers Company drilled and shot solid limestone rock inside the cofferdam to reach the planned subgrade elevation.