Lake Tawakoni Water Treatment Plant

This project consisted of the construction of a new 30-MGD Water Treatment facility including the installation of two 2,250 HP, 4,160v Horizontal Split Case Pumps with Variable Frequency Drives in an existing High Service Pump Station.  This pump station also utilized hydraulically actuated pump control ball valves.  BAR self-performed all of the mechanical, yard piping, ozone, excavation, and concrete work on this project.  Like many of BAR’s large concrete project, BAR utilized an on-site concrete batch plant.  Extensive yard piping ranging from 6”-72” connected all of the different structures.  Also in the project was the construction of a raw water flow control structure, a raw water distribution structure, and two new basin trains each containing coagulation, flocculation, and sedimentation facilities.  The filtration facilities consisted of a filter complex containing six constant-rate gravity filters with a blower building for filter backwashing.  An Ozone Generation facility provided ozone for the Ozone Contactor Basins between the Sedimentation Basins and the Filter Complex.  This Ozone Generation Building was part of a larger Administration Building that also housed the plant control room, a water quality laboratory, the chemical feed pump equipment, and the bulk chemical storage tanks.  In addition to ozone, the process chemical systems installed were sodium hypochlorite, ferric sulfate, ammonium sulfate, fluoride, polymer, and calcium thiosulfate.  The chemical feed lines left this Control and Chemical Feed Building and run inside chemical trenches around the plant site to their respective feed points.  Also in this project is a cast-in-place concrete clear well, backwash and plant water pumping stations.  This is a manned treatment plant, but is also integrated into the SCADA system of the North Texas Municipal Water District main facility in Wylie, TX.