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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 parts,operation of chemical and photographic laboratories,storage and mixing of pesticides,and storage and treatment of liquid and solid wastes. Liquid waste treatment/storage areas include two unlined sewage effluent ponds,two abandoned sewage lagoons,two lined industrial waste water ponds, an abandoned paint spraying/stripping rinse water pond,an abandoned trench where 150 drums of lubricating oil reportedly were buried,an unlined pond for holding storm water,an abandoned pesticide disposal trench,an abandoned area where substantial amounts of formaldehyde were buried,and aboveground and belowground waste tanks.Also,liquid wastes were formerly stored on-site in an unpaved area,and solvents,radiological commodities,medical supplies, and solid and liquid chemicals were disposed of in three burning pits. Former solid waste treatment'storage areas include a fill area where food items were buried,a fill area where construction material was buried,and three impoundments where wastes containing mercury phosphate compounds were stored.Currently,all solid he ardous waste is hauled off-site to facilities regulated under Subtitle C of the Resource Conservation and Recovery Act. Tracy Defense Depot is participating in the Installation Restoration Program IRP),established in 1978.Under this program,the Department of Defense seeks to identify,investigate,and clean up contamination from he ardous materials.In 1985,IRP tests indicated the shallow aquifer below the site, which extends from 15 feet to 250 feel below the surface,is contaminated with trichloroethylene and tetrachloroethylene.The water inthe aquifer, however,is generally too saline for most uses.Municipal,private,and irrigation wells are within 3 miles of he ardous substances at the depot. Water from Tracy s municipal well,which is within 3 miles of the site,is blendedwith water from other wells and from Delta Mendota Canal to provide drinking water to an estimated 28,600 people.The Defense Logistics Agency is conducting a remedial invesfigation/feasibility study RI/FS)to determine the type and extent of contamination at the depot and identify alternatives for remedial action.The State is reviewing the depot s proposal to undertake an interim remedial measure involving pumping and treating groundwater to remove contamination.Status August 30, 1990):A public meeting was held in May 1990 on the plan to pump and treat contaminated ground water.The State is reviewing the depot s draft RI/FS plan. EPA,the State,and the Defense Logistics Agency will negotiate an Interagency Agreement under CERCLA Section 120 covering response activities at the depot. Site Status Details: NPL Status: Final Proposed Date: 07/14/1989 Final Date: 08/30/1990 Deleted Date: Not reported Narratives Details: NPL Name: TRACY DEFENSE DEPOT(USARMY) City: TRACY State: CA CERCLIS: Site ID: 0902762 EPA ID: CA4971520834 Facility County: SAN JOAQUIN Short Name: TRACY DEFENSE DEPOT Congressional District: 11 IFMS ID: 09Q5 SMSA Number: 8120 TC3372962.1s Page 34