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On-Site Wells <br /> One domestic well is currently operational on the Site. An older domestic well near the <br /> house was either capped or destroyed in the past, according to Mr. Quintero (personal <br /> communication, September 18, 2019). Four older wells have also been destroyed, <br /> according to the permits reviewed. <br /> Three well permits were identified for the Site from among the files of the San Joaquin <br /> County Environmental Health Department: <br /> • June 1987 permit for a new domestic well. The permit indicates that the well had <br /> a grout seal at 50 feet. <br /> • July 1987 permit for well destruction. The attached sketch depicts two six-inch <br /> wells, an ag well, and an "old well." A note indicates that "all 4 wells destroyed." <br /> A new well (discussed above) is depicted north of the house. An "old house" is <br /> depicted on the permit to the southwest of the existing home; this building may <br /> have been located on the adjacent parcel to the west, as Mr. Quintero has <br /> indicated that both structures on the south side of the Site have always been <br /> sheds/barns (personal communication, September 18, 2019). <br /> • March 2001 permit for the construction of a replacement domestic well. The <br /> permit indicates that the well was drilled to a depth of approximately 260 feet, <br /> with a grout seal at 100 feet. A note reads "old well inspected out of service <br /> 8/1/01." <br /> These permits have been included in Appendix 4 of this report. <br /> Water Sample <br /> Live Oak collected a water sample from the domestic well on the Site on August 30, <br /> 2019. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San <br /> Joaquin County Environmental Health Department policy. <br /> As required by the laboratory, the sample was collected in a plastic container and two <br /> glass vials for nitrate and DBCP analysis, respectively. Trip blanks were also utilized. <br /> The sample was placed on ice and transported under chain of custody to FGL <br /> Environmental, Stockton. <br /> Nitrate was detected in the sample at a concentration of 1.1 mg/L-N. DBCP was <br /> detected in the water sample at a concentration of 0.06 µg/L. The laboratory analytical <br /> results are attached as Appendix 5 of this report. <br /> Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. <br /> Application of fertilizers, livestock waste, and untreated septic tank waste can all <br /> LOGE 1942 Page 4 <br />