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Map ID MAP FINDINGS Direction Distance EDR ID Number Elevation Site Database(s) EPA ID Number TRACY DEFENSE DEPOT(USARMY) (Continued) 1000182407 CERCLIS Site Alias Name(s): Alias ID: 101 Alias Name: DEFENSE DEPOT TRACY Alias Address: Not reported CA Alias ID: 102 Alias Name: TRACY DEFENSE DEPOT Alias Address: Not reported Not reported Alias ID: 103 Alias Name: TRACY DEFENSE DEPOT(USARMY) Alias Address: CHRISMAN RD TRACY,CA 95376 Alias ID: 9270151 Alias Name: TRACY DEFENSE DEPOT Alias Address: CHRISMAN ROAD TRACY,CA 92719 Alias ID: 101 Alias Comments: PREVIOUS EPA ID#AZD 981 416 977 Site Description: The Defense Distribution Depot San Joaquin California,Tracy Site(DDJC-Tracy) is located in an unincorporated area of San Joaquin County,1.5 miles southeast of Tracy,California;it is approximately 20 miles southwest of Stockton, California,and 60 miles east of San Francisco,California. The DDJC-Tracy site began functioning as a depot in 1942.The Defense Logistics Agency(DLA) has operated DDJC-Tracy since 1963 as a storage and distribution depot for the United States military services in the western United States and throughout the Pacific.The operating portion of the depot covers a 448-acre triangular parcel;the recently added Tracy Annex consists of 460 acres of agricultural land north of the operating portion of the depot.The topography at DDJC-Tracy is gently downward to the north-northwest from an elevation of about 115 feet above mean sea level(ms])at the southern comer to an elevation of 45 feet above sea level at the northern edge of the Tracy Annex. About 75 percent of the operating portion is covered with buildings(primarily warehouses), asphalt,or concrete. Numerous smaller buildings in the northwest comer of the depot house administration and operations. A large storm water pond and two sewage lagoons are also located in the northwestern portion of the depot. The storm water pond receives runoff from the depot's storm drain system. The sewage lagoons receive treated wastewater from the depot's wastewater treatment plant. The only landscaped area is in the northwest comer near Building 100. All other unpaved surfaces contain weeds and grass,which historically have been removed regularly with herbicides(types and quantities were not recorded) and/or by grading.Historical operations at the depot have included the handling and use of potentially hazardous materials. In early 1980,a records search by the U.S.Army Toxic and Hazardous Materials Agency(USATHAMA) first identified 25 waste sites,known as solid waste management units(SWMUs) 1 through 23,2A,and 10A,at DDJC-Tracy that contained contaminants that could migrate to off-depot locations. The records search concluded that waste disposal practices between 1940 and the mid-19706-including the use of burning to dispose of wastes,operation of underground sumps/tanks,and use of unlined drainage and sewage leaching ponds-probably were responsible for the reported contamination. Because of the potential for contaminants to migrate to groundwater, 12 monitoring wells were installed in July 1980 and sampled for metals and general water quality parameters. In May 1984,the Central Valley Regional Water quality Control Board(RWOCB)was advised that trichloroethene (TCE)wand tetrachloroethene(PCE)concentrations in three monitoring wells exceeded the California Department of Health Services(DHS)action level of 5 micrograms per liter(ug/1). Ultimately,a remedial investigation/feasibilily, TC3372962.1s Page 36