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• Defense Distribution San Joaquin CA—Tracy, 25600 S. Chrisman Rd. <br /> GeoTracker lists 27 separate cases for this facility, abbreviated as DDJC-Tracy. <br /> Envirostor lists three cases, including a Federal Superfund listing. The <br /> contaminants of concern include pesticides, herbicides, chlorinated <br /> hydrocarbons, heating oil/fuel oil, tetrachloroethylene (PCE), and <br /> trichloroethylene (TCE). Soil, soil vapor, and groundwater have been impacted. <br /> "DDJC-Tracy comprises the depot and the additional Annex property. The 448- <br /> acre active portion of the installation forms a triangle with one side measuring <br /> approximately 1.4 miles long and the two remaining sides measuring <br /> approximately 1.15 miles long each. The 460-acre Annex property is agricultural <br /> land located to the north of the active installation. The installation includes <br /> railroad spurs, and storage, maintenance, and administrative buildings. Also, a <br /> day care center and other infrastructure buildings are located at the depot. The <br /> primary missions at DDJC-Tracy have been the storage, shipping, packaging, <br /> and maintenance of general supplies in support of the United States Armed <br /> Forces defense mission. These tasks required use of industrial chemicals and <br /> hydrocarbon fuels. Inadvertent releases of these chemicals and fuels have <br /> contaminated installation soils and underlying groundwater. Environmental <br /> studies began at DDJC-Tracy in 1980. Based on the results, the installation was <br /> added to the National Priorities List in 1990. DDJC-Tracy currently pumps and <br /> treats groundwater contaminated with volatile organic compounds, metals, and <br /> pesticides. The treated water is then discharged back to groundwater by injection <br /> and percolation." The Second Five-Year Review Report (URS, 2012) presents <br /> evidence of a preferential hydrogeologic pathway to the northeast from the <br /> DDJC-Tracy facility (away from the Site of the current investigation). Based on <br /> maps provided with this report, it appears that the "hot spots" of the groundwater <br /> contaminant plumes from the DDJC-Tracy facility are located north of the Site of <br /> the current investigation. URS depicts the monitoring wells closest to the subject <br /> Site as non-detect for the major groundwater contaminants of concern for the <br /> third quarter of 2009 (the most recent sampling event referred to in that <br /> document). <br /> LOGE 1303 Page 7 <br />