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d. Background Information The Facility is a topping cycle cogeneration plant utilizing one General Electric Model IM5000 STIG packaged gas turbine generator unit exhausting into one heat gen- erator. Power is generated at 13 .8 kilovolts, 60 hertz . The power is transformed to 115 kilovolts and delivered to the PG&E system. Steam generated from the gas turbine hot exhaust gases is delivered to the nearby Libby- Owens-Ford plant for use in its glass manufacturing process and the remainder is injected into the gas tur- bine for emissions control and power augmentation. The terrain at the plant site is relatively flat, with a relief of about 10 feet and a regional easterly slope of about 5 feet per mile. There are no springs, mines, quarries, or faults either known or suspected in the Area of Review. The San Joaquin River, about 1 1/2 miles west of the proposed injection well is the major drainage of the area. Water Source San Joaquin CoGen Limited considered several options for a source of raw water: community water supplies, private water supplies, treated community sewage, and Sharpe Army Depot's outfall from its remediation program. Geotechnical studies indicate that the San Joaquin Valley has a very limited supply of reliable fresh water and that additional demands from the wells could cause saltwater intrusion into the community water supplies. The use of privately owned and operated wells raised the same concerns, in addition to being too costly to run pipe from the supplies to the facility. Water treatment necessary to clean sewage outfall water for use as process water would result in a large amount of solid waste which would require disposal. Pumping costs as well as piping were also considered excessive. The Facility intends to use the byproduct remediation water from Sharpe Army Depot (NPDES Permit No. CA- 0004839) as its raw water source. This source draws water from an aquifer located 100 feet to 300 feet in depth at well locations approximately 2 miles from the site. The water obtained from Sharpe Army Depot consists of water drawn from remediation wells and processed through air strippers to remove TCE (Trichloroethene) , EPA Hazardous Waste No. U228, pursuant to requirements imposed upon Sharpe Army Depot under the terms of the 2