Natomas and South River Pump Stations

Sacramento, California

The Sacramento Regional County Sanitation District selected Kiewit to construct the new Natomas and South River Pump Stations, a portion of the Lower Northwest Interceptor. The Lower Northwest Interceptor is a 19-mile regional pipeline that transports approximately 200 million gallons per day of sewage from the Natomas community in northern Sacramento and the City of West Sacramento to the district’s wastewater treatment plant located in Elk Grove.

The two identical pumping stations are located at the northern end and about midpoint on the pipeline. Working at a depth of 80 feet, crews pumped groundwater from the excavation site at a rate of 14 million gallons per day to enable construction. The scope of work at each site involved excavation support, dewatering, constructing new below-grade and at-grade concrete structures, installing mechanical equipment. In addition, the project scope involved the erection of a steel truss roof, concrete masonry unit block buildings, installing electrical and control equipment, and constructing odor control facility.

Site work consists of 56,000 square feet of excavation support, 200,000 cubic yards of excavation and embankment, 39,000 feet of two-inch to 120-inch underground pipe installation, 17,000 feet of aboveground pipe, 413,000 square feet of base course and asphalt paving and 33,000 cubic yards of structural concrete.