Project : WCSA Water Treatment Plant and Distribution System

Washington County Service Authority -- Abingdon, Virginia

The CHA/Lane Group Team was commissioned by the Washington County Service Authority (WCSA) to upgrade of its Middle Fork Water Treatment Plant (WTP) to 12 MGD. The upgrade was accomplished in two construction projects. The first project expanded the WTP from 4.6 to 6.6 MGD to save the WCSA approximately $1,000,000 annually in water purchases. It was designed and constructed in less than 20 months. The second project expanded the WTP from 6.6 to 12 MGD to provide reliable drinking water for the 30-year planning period.

CHA provided the process, structural, mechanical, electrical, and controls design for both the interim expansion and the final expansion to 12 MGD for the water treatment plant. The process included pre-sedimentation with tube settlers in the existing sedimentation basins, high-rate sedimentation utilizing three adsorption clarifiers, the retrofit of three existing dual media filters, the construction of five new dual media filters, and 600 horsepower finished water pumps. Additional improvements included the baffling of the existing clearwell, a chemical storage and feed complex, new flocculation tanks, and an energy recovery turbine to save the WCSA approximately $30,000 annually in power costs.

The CHA/Lane Group Team also expanded and modernized a building built in 1975 to include a new laboratory, office space, conference room, and reception area. The project also installed a state-of-the-art Supervisory Control and Data Acquisition System to monitor and control the expanded facilities.

Services Provided by CHA:
  • Planning
  • Permitting
  • Design
  • Bidding
  • Construction Phase Services