USI engineers have extensive experience evaluating water supply and treatment options to provide the highest quality of potable water. This includes watershed analysis to determine firm yields and water quality testing to identify alternative treatment methods that will comply with federal and state regulatory requirements. These requirements include compliance with the Interim Enhanced Surface Water Treatment Rule (IESWTR) and the Disinfectants/Disinfection By-products Rule (DBPR) established by the Environmental Protection Agency (EPA).
Preliminary design studies may include pilot projects to determine the effectiveness of different types of treatment processes such as high–rate sedimentation, enhanced coagulation, membrane filtration, granular-activated–carbon (GAC) filtration and ozone or ultraviolet (UV) disinfection. Our engineers have designed both shallow (less than 20 feet deep) and deep (up to 100 feet deep) surface water intakes with capacities up to 24 million gallons per day (MGD), as well as both shallow and deep groundwater well fields.
Surface water intakes have included features such as passive intake screens with air-scour backwash. Treatment plant design experience has included small packaged plants (less than 250,000 gallons per day) up to large conventional plants (over 40 MGD). Treatment processes have included conventional coagulation, sedimentation, and filtration, as well as modified processes for enhanced coagulation, high–rate sedimentation and filtration with dual media and deep–bed, single–media types featuring air/water backwash capabilities. Disinfection processes have included conventional chlorination, single and two–stage ozonation followed by GAC filtration for biological–activate–carbon (BAC) filtration.