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• January 1973 permit for pump replacement at wash down area; the permit notes <br /> that the pump is in the yard behind the shop (1754). <br /> • November 1973 permit for pump replacement at well; the permit notes that the <br /> pump is located adjacent to a shop building (1754). <br /> • July 1976 permit for new domestic well. Based on the attached sketch, this <br /> appears to be the current active well on the Site (1754). The permit notes that <br /> the grout seal was placed at a depth of 50 feet. <br /> • January 1978 permit for pump installation at domestic well. Based on the <br /> attached sketch, this appears to be the current active well on the Site (1754). <br /> • July 1998 permit for destruction of 120-foot deep well (1748). This appears to be <br /> the well adjacent to the shop building. <br /> • August 2019 permit for destruction of 140-foot deep well. Based on the attached <br /> drawing and coordinates, this appears to be the well located in the southern <br /> parking area of the Site (1796). <br /> These permits have been included in Appendix 4. <br /> Water Sample <br /> Live Oak collected a water sample from the domestic well on the Site on June 11, 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 0.2 mg/L-N. No DBCP was <br /> detected in the sample. The laboratory analytical results are attached as Appendix 5 of <br /> 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 20-24 Page 5 <br />