As the primary water source for the Contra Costa Water District, the Los Vaqueros Dam measures 1,000 feet across and 192 feet high. During construction, project personnel suggested a value engineering concept that considered the creation of rip rap from on-site oversized rock from the excavation. This resulted in more than 50,000 cubic yards of rip rap generated on-site.
Working at a depth of 80 feet, crews from Kiewit Pacific Co. pumped groundwater from the excavation site at a rate of 14 million gallons per day to construct New Natomas and South River Pumping Stations. The scope of work at each site involves excavation support, dewatering, constructing new below-grade and at-grade concrete structures and installing mechanical equipment.
This award-winning project allows migrating salmon and steelhead trout to bypass the Bonneville Dam and travel safely through the Columbia River. Kiewit Pacific Co. ultimately constructed a 3,000-ft.-long, high velocity concrete chute with 25-ft.-high walls to transport fish around the dam and through a new channel outfall.
The Val Vista Transmission Main Rehabilitation and Replacement project, delivered in seven GMP’s, was the largest project of its kind in the United States., The project was developed to trenchlessly rehabilitate a critical piece of infrastructure that transports 220 MG of drinking water to as much as 60 percent of the population in Phoenix, Arizona. The project involved the rehabilitation of 30,000 feet of 96-inch to 72-inch prestressed concrete cylinder pipe by means of a split-can, steel slip lining.
The City of Bakersfield awarded Kiewit Pacific Co., a subsidiary of Kiewit Corporation, a $29 million project to upgrade the existing Bakersfield Wastewater Treatment Plant. To date, this project is the largest contract the City of Bakersfield has ever awarded.
Kiewit Pacific Co. was awarded an $18 million contract to rehabilitate 12 rectangular primary sedimentation tanks. Crews will replace grit slurry piping and grit overflow piping in grit handling areas as well as constructing related structural, mechanical and electrical work.
This $61 million project involved the design and construction of a water transmission system. The success of the shutdown, tie-in, and restart was due to the project team's well planned coordination and communication with the local agencies and community.