C Transmission Line Project
December 2025
Activity is ramping up at Copper Cove. Mozingo Construction is preparing to begin mainline installation, with a small crew already mobilizing at Tank C with crews beginning with the potholing process, and full pipeline installation is scheduled to begin in late December.
Important Notice:
Changeable Message Signs will be placed along Little John Road to notify drivers of upcoming road closures.
Road Closure Schedule
- December 22,23,29,30: Kiva Place to Little John (CCWD Driveway)
- Starting January 5, 2026: From Kiva Pl. to Moccasin St.
Dates are subject to change due to weather and production.
Project Name: Copper Cove Booster Pump Station Modifications and Transmission Line CIP 11122
Project Location: Copperopolis, CA
Brief Description: The Project for the Calaveras County Water District is located in the community of Copperopolis, California.
The Project consists of the following work:
- Construction of approximately 12,000 LF of 20” ductile iron transmission main, connecting the Copper Cove Water Treatment Plant (WTP) booster pump station (BPS) (located at Kiva Place) to the C-Tanks.
- Installation of three (3) high-head pumps at the BPS.
- Installation of Electrical, Instrumentation, and Controls associated with the high-head pumps.
The Why
Copper C Tank Transmission and Booster Pump Station Project, Formerly known as the B C Transmission Main
The C Transmission and Booster Pump Station Project is an important improvement to the Copper Cove water system. The project will improve water reliability, fire protection, and water quality while reducing strain on aging infrastructure. It will also prepare the system to meet current and future water demands. This improvement will serve all water customers in Copperopolis.
Why this project is needed
The existing water system is not keeping up with peak day demand. During hot summer days, water use increases significantly and the system cannot reliably deliver enough water to maintain C Tank levels. This reduces system reliability and limits fire protection when demand is highest.
How the system works today
All treated water from the Copper Cove Water Treatment Plant is first pumped to the B Tanks. Water serving the C Zone must then be pumped a second time through the existing and aging B C Zone Booster Pump Station to reach the C Tanks on Charmstone Way. This two step process creates a bottleneck in the system.
The existing booster pump station can deliver about 1100 gallons per minute, while current peak demand is about 1600 gallons per minute. Future demand is expected to increase to approximately 2500 gallons per minute. Because the system cannot keep up, C Tank levels can drop during peak use periods.
What the project includes
The project will construct approximately 12,000 feet of new 20 inch ductile iron transmission pipeline from the Water Treatment Plant to the C Tanks, water will then flow by gravity to feed B Tank. An upgraded booster pump station will be built at the Water Treatment Plant near the end of Little John Road. The station will include three high head pumps along with new electrical systems, instrumentation, and controls.
The new pipeline will be installed mostly within existing roadway pavement along Little John Road before turning uphill toward the C Tanks. It will be a dedicated transmission pipeline with no service connections and will only be used to move treated water to higher elevation areas.
Why the pipeline is 20 inches
Engineering studies showed that a smaller 16 inch pipeline would not meet water disinfection requirements. The C Tanks have limited internal baffling, which means the transmission pipeline must provide some of the required chlorine contact time for disinfection. The 20 inch pipeline meets these requirements and provides enough capacity for both current and future demands while reducing energy use.
Benefits to the community
Once completed, the project will eliminate the existing bottleneck and remove the need for two step pumping. Water pressures will be better controlled, fire flow availability will improve, and the risk of water main breaks and plumbing damage will be reduced. Water quality will also improve due to reduced water age in the system.
Project schedule and construction
Construction bids were opened in March 2025 and six bids were received. Mozingo Construction Incorporated was awarded the contract for approximately 8.26 million dollars. Construction is expected to take nine months. During construction, the District and contractor will coordinate work and traffic control to minimize impacts to the community.