Robert Diemer Filtration Plant

The $71 million Robert B. Diemer Filtration Plant project was to establish a seismically stable foundation for a new ozone generation facility. Kiewit Pacific Co., a subsidiary of Kiewit Corporation, completed the work while the plant was running at full capacity and producing about 500 million gallons a day with full access to the site.

Before any production work could begin, a large amount of demolition work needed to be completed, including the existing maintenance building, fueling station, asphalt parking area and duct bank runs. The team also contained and disposed of asbestos- and lead- containing debris.

Major quantities included 1,200 linear feet of 36-inch and 1,900 linear feet of 48-inch cement mortar lined and coated steel pipe as well as 305 linear feet of 145-inch cement mortar lined and coated steel pipe. The work included installing water and sanitary sewer line and miscellaneous PVC line, constructing an electrical duct bank and relocating controls. The site's 385,000 cubic yards of excavation required installing 80,000 square feet of soldier pile, re-steel and shotcrete support of excavation walls.

Additional work included 16,000 square yards of foundation preparation, 43,000 cubic yards of stockpiling earth materials for future projects, 185,000 cubic yards of roller compacted concrete (RCC) embankment, new access roadways and other miscellaneous site improvements. More than 250,000 cubic yards of earth embankment was completed and then inspected by the California State Department of Water Resources - Division of Safety of Dams.