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INITIAL RELEASE DDJC Tracy BACKGROUND Site Description and History The Defense Depot San Joaquin (DDJC) Tracy is a 448-acre installation owned by the Defense Logistics Agency (DLA) in California. (The site was formerly known as the Defense Distribution Region West-Tracy Army Depot.) The DDJC Tracy site is located 1.5 miles southeast of the city of Tracy and 20 miles south of Stockton in an unincorporated area of San Joaquin County (see Figure 1). In 1992, DLA acquired an additional 460 acres of private agricultural property located north of the depot. The additional property is known as the Tracy Annex (Montgomery Watson, 1995). The current depot property is bordered to the north by 11th Street and the Southern Pacific Railroad; to the east by (in part) Banta Road; to the south by the Union Pacific Railroad; and to the west by Chrisman Road and privately owned parcels used for row crops (see Figure 2). The dominant structures on the site include 24 warehouses associated with the depot's logistics and supplies functions. Numerous smaller buildings, housing administrative, maintenance, and operational functions, are located on the northern end of the site. Most of the industrial operations are confined to approximately 28 acres of the original portion of land. An estimated 75 percent of the property is covered with buildings or pavement; the remaining open, unpaved areas are covered with grass or gravel on soil (Woodward-Clyde Consultants, 1992a; Montgomery Watson, 1995). DDJC Tracy has functioned as a storage and distribution facility for food, medical, construction, clothing, electrical, industrial, and general supplies since 1942. Prior to the early 1970s, wastes, such as pesticides, battery acids, construction materials, embalming fluids, and fuels were discharged, buried, or burned on site. In 1980, groundwater monitoring at DDJC Tracy detected trichloroethylene (TCE) and tetrachloroethylene (PCE) in monitoring wells at levels (20 parts per billion [ppb]) exceeding the federal and state acceptable level of 5 ppb. These compounds had been used as cleaning fluids in the depot's industrial areas until 1976. In addition, TCE and PCE had been brought on site in bulk and stored in drums for distribution to other defense facilities. Since 1983, the results of several environmental investigations indicated that soil and groundwater at the site were contaminated with TCE and other volatile organic compounds (VOCs), and that groundwater contaminated with TCE and PCE had migrated approximately 2,000 feet off site in a north-northeasterly direction (Montgomery Watson, 1995). Following these findings, U.S. Environmental Protection Agency (EPA) placed DDJC Tracy on the Comprehensive Environmental Response, Compensation, and Liability Act—referred to as Superfund—National Priorities List (NPL) in August 1990. A Federal Facilities Agreement between EPA, DDJC Tracy, the California Department of Health Services, and the California Regional Water Quality Control 2