West End Improvements for Rarity Ridge
LOCATION: Oak Ridge, Tennessee
- Steve Bostic
- Glenn Hanson
CONSTRUCTION COST: $2 Million
- New Development
- Horizontal Directional Drilling Technique
- Complex River Crossing
- Funding Assistance
A growing population created a need for additional water, but the nearby river presented a challenge for this project that required precision planning and technology.
The Rarity Ridge development, located on the western edge of the City of Oak Ridge, is designed for up to 3,500 residential units. At the time this project was proposed, the development only had the capacity to supply 1,000 units with potable water for domestic use and basic fire protection. Water for the development was being purchased from a neighboring utility district. LDA Engineering was hired by the City to create a plan to serve the development from existing City distribution facilities that currently serve the U.S. Department of Energy’s K-25 facility.
LDA Engineering developed construction documents for a water line extension from distribution mains at the City’s existing K-25 water treatment plant to an existing main in the Rarity Ridge development. The project consisted of a 12-inch water main, a river crossing, and a booster pumping station plus a motor-operated valve and pressure reducing valve station.
The 12-inch water line extended approximately 7,400 linear feet along an existing county road, crossing a state highway through a bored and jacked casing and along an existing City street inside the development. Facing the challenge of crossing a portion of the Clinch River with the new line, LDA Engineering used horizontal directional drilling technology to cross under the river in order to protect the riverbed from being disturbed. The new booster station was designed to pump approximately 1,000 gallons per minute to an existing elevated storage facility on the Rarity Ridge site. Included in the booster station construction was the installation of connections for a portable generator, SCADA system, flow meter, and other mechanical and electrical appurtenances.
The motor-operated valve/pressure reducing valve station was designed to control the flow rate and pressure from the City’s existing distribution piping served by theY-12 water treatment facility to the distribution piping served by the K-25 water treatment facility. The K-25 facility could therefore be retired, saving operational costs. The motor operated valve is PLC-controlled by the level in the existing storage tanks through a fiber optic communication line installed between the two sites.
LDA Engineering also prepared a Preliminary Engineering Report and an Environmental Information Document for submittal to funding agencies, provided permitting services, developed a Stormwater Pollution Prevention Plan (SWPPP), and provided assistance with bidding and engineering services during construction.Back to Projects