Bakersfield Wastewater Treatment Plant #3

The City of Bakersfield awarded Kiewit Pacific Co., a subsidiary of Kiewit Corporation, a $219 million project to upgrade the existing Bakersfield Wastewater Treatment Plant. The scope of work involves expanding the plant's capacity of 16 million gallons per day to 32 million gallons per day as well as to provide secondary and tertiary treatment processes, odor control systems, a new operations building and a new maintenance shop.

To date, this project is the largest contract the City of Bakersfield has ever awarded and is expected to be completed in 30 months. The scope of work involves constructing a new headworks structure that includes mechanically cleaned bar screens, influent pumps and grit removal tanks. The team is also constructing a new activated sludge secondary treatment system, which consists of aeration basins, fine bubble air diffusers, aeration blowers, a blower building, secondary clarifiers, return activated sludge/waste activated sludge pump station and a plant process water pump station.

In addition, crews are constructing upgrades to a two-million-gallons-per-day tertiary treatment system , which includes a rapid mixer, cloth media continuous backwash filter, chlorine contact tank, flocculation and disinfection chemical facilities, six new effluent disposal percolation basins, dissolved air flotation sludge thickeners. The overall project quantities include more than 1.5 million cubic yards of scraper excavation; 42,000 cubic yards of structural concrete; and 120,000 linear feet of aboveground and underground pipe ranging from one-half inch to 90 inches in diameter.