The City of El Centro (City) owns and operates a Water Treatment Plant (WTP) that receives its water supply from the Colorado River through the Imperial Irrigation District’s (IID) canals. The City’s WTP has a design capacity of 21 MGD, with an average daily demand of 7.8 MGD and current peak flows of 13-14 MGD.
The WTP currently operates a gaseous chlorine water disinfection system to disinfect the water prior to discharging it into the City’s supply lines. The City has expressed concern regarding the usage of chlorine gas as a disinfectant, as chlorine gas is toxic and poses dangers to the public and operations staff. Since the WTP is located adjacent to residential areas, the risk of chlorine gas exposure to the public is greatly increased in the unlikely event of a large leak.
The City has contracted with LEE + RO to convert from a gaseous chlorine system to a 12.5% bulk sodium hypochlorite disinfection system. LEE + RO will provide the preliminary design, final design, bid phase and engineering support services during construction. Engineering services will include designs for construction of new bulk sodium hypochlorite systems, including all equipment, two (2) double-walled chemical storage tanks, five (5) chemical metering pumps, shower/eyewash stations, connected piping, valves, electrical and instrumentation, and process control via SCADA.
LEE + RO received a second contract for the replacement of the existing raw water electrical panel with a new electrical panel. The existing panel is utilized to feed electricity to four raw water pumps, a transfer pump, a HVAC unit and security lights. LEE + RO will provide the preliminary design, final design, bid phase and engineering support services during construction. The project design elements include:
- Replace the existing electrical panel (MCC-1) and its incoming feeder from the Plant MCC.
- Feed all four raw water pumps from the new/replaced MCC-1 via four VFDs, as well as feeding power to a transfer pump and the rest of the facility lighting, receptacles, and HVAC loads.
- Add a new RTU cabinet with compatible I/O cards, CPU, and power supply, to transmit pump status signals to the Plant SCADA system.
- As an optional scope item, an outdoor portable generator hook-up and manual transfer switch (MTS) will be provided.
