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o <br /> Use Data dated February ythe nitrate map, no <br /> wells within a one-mile r, d for nitrate; farther <br /> from the Site, a variety of5` �� PRc2� gyral over 10 mg/L-N. <br /> According to the DBCP n the Site have been <br /> tested for DBCP; no DB �,ptp of Q,�„� the Site, DBCP is <br /> present over 0.2 �tg/L in a <br /> On-Site Wells K-A <br /> A domestic well is located 'J fled for the Site from <br /> among the files of the Sar apartment: <br /> • November 1997 pE drilled to a depth of <br /> 170 feet, with a grout seal at 100 feet. The permit notes that first ground water <br /> was encountered at 20 feet below ground surface. <br /> • November 1997 permit for destruction of old 60-foot deep well. <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 April 14, 2020. <br /> 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 2.6 mg/L-N. DBCP was not <br /> detected in the water sample. The laboratory analytical results are attached as <br /> 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 /> contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in <br /> shallow ground water zones. Based on work in the Sacramento Valley from the early <br /> 1900s, it is estimated that under "natural" conditions, ground water contains nitrate at <br /> concentrations no more then about 3 mg/L-N. Nitrate may be increasing in areas with <br /> concentrations of 5.5 mg/L-N or more (Hull, 1984). The US EPA has set the Maximum <br /> Contaminant Level (MCL) for nitrate at 10 mg/L-N. <br /> LOGE 20-15 Page 4 <br />