WPCP Reliability Improvement Project

To improve the wet weather reliability of the Water Pollution Control Plant and reduce the need to discharge untreated or under-treated wastewater into the San Francisco Bay, Kiewit Pacific Co., a subsidiary of Kiewit Corporation, constructed upgrades to the plant.

Originally constructed in 1956, the plant is located at the southernmost tip of the San Francisco Bay and provides primary treatment for 36 millions of gallons of wastewater. The plant has the capacity to treat 167 millions of gallons from a service area in excess of 300 square miles.

The project's improvements include an emergency basin and basin structures, 120-inch influent line, a raw sewage influent metering vault, a main headworks structure, raw sewage flow distribution structures, a grit handling structure, a screenings handling structure, yard structures/piping and appurtenances, and electrical and instrumentation modifications.

Major quantities include 17 new structures; 75,512 cubic yards of structural excavation; 17,296 cubic yards of concrete; 17,785 feet of trenching; 5,009 feet of large underground pipe; and 1,225 pairs of sheet piles.