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INFORMATION SHEET ORDER NO. R5-2004-XXXX DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY Site Description and Background Defense Distribution Depot San Joaquin Sharpe Site (DDJC-Sharpe) is an active storage and distribution facility for various supplies common to U.S. military services in the Western United States and throughout the Pacific Region. DDJC-Sharpe is in San Joaquin County and is located approximately nine miles south of Stockton, California. The installation forms a rectangle that is approximately 0.5 mile wide(east-west) and 2 miles long(north-south) and encompasses approximately 720 acres. The facility was established in 1940, and since that time the facility has received, stored, packaged, and shipped military supplies. The facility's operations in later years included maintenance of equipment and aircraft. Environmental investigations in 1979 revealed that on-base activities had contaminated site soils and groundwater. In 1987 the facility was placed on the U.S. Environmental Protection Agency's (USEPA's)National Priorities List (NPL) due to groundwater and on-site soil contamination by cleaning and degreasing solvents (including the volatile organic compounds (VOC's) trichloroethylene (TCE) and tetrachloroethylene (PCE)) and, to a lesser extent, by metals,pesticides, and nitrate. This Order governs the discharge of treated domestic wastewater to land only and is not applicable to soil and groundwater cleanup activities specified in the Record of Decision or monitoring/reporting activities specified in the Federal Facilities Agreement. Discharge DDJC-Sharpe owns, operates, maintains, and monitors a domestic wastewater treatment facility(WWTF). The WWTF serves the entire 720-acre site, which consists primarily of warehouse buildings and offices. DDJC-Sharpe's wastewater treatment process includes primary treatment, secondary treatment, disinfection, and solids handling systems. The primary treatment consists of physical treatment in a single clarifier to remove settable and floating solids. The secondary treatment consists of a two-stage trickling filter and a second clarifier. Disinfection is accomplished by a chlorine contact tank. Prior to discharge,wastewater is dechlorinated with sulfur dioxide gas. The solids handling system consists of a single anaerobic digester and four sludge-drying beds. Dried sludge is collected from the beds and hauled to a local permitted landfill for disposal. Effluent is discharged to a evaporation/percolation pond adjacent to the WWTF. During periods of pond maintenance or if additional disposal capacity is needed, DDJC-Sharpe may also discharge to a temporary pond located south of Building 404.