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detected in three of these wells at concentrations between 5.1 and 10.0 mg/L-N and in <br />six of these wells at concentrations over 10 mg/L-N. According to the DBCP map, four <br />wells within a one -mile radius of the Site have been tested for DBCP; no DBCP was <br />detected in any of the wells. <br />On -Site Wells <br />A domestic well is located on the Site. Five well permits were identified for the Site from <br />among the files of the San Joaquin County Environmental Health Department: <br />• June 1979 permit for pump installation at domestic well. <br />• February 1995 permit for pump installation at domestic well. The first water level <br />is listed as 52 feet. <br />• January 1998 permit for pump installation at domestic well. The first water level <br />is listed as 50 feet. <br />• January 2002 permit for well system repair at domestic well. The first water level <br />is listed as 60 feet. <br />• October 2007 permit for pump replacement at domestic 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 January 4, <br />2022. 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 three <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 7.5 mg/L-N. DBCP was not <br />detected in the sample. The laboratory analytical reports 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 />LOGE 2204 Page 4 <br />