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On -Site Wells <br />Two domestic wells are located on the Site (Plates 3 and 4). Three well permits were <br />identified for the Site from among the files of the San Joaquin County Environmental <br />Health Department: <br />• September 2007 permit for new domestic well (32521). The well had a proposed <br />depth of 250 feet, with a grout seal at 100 feet. <br />• February 2010 permit for new pump at domestic well (32521). <br />• September 2005 permit for new domestic well. The permit indicates at total <br />depth if 220 feet, with a grout seal at 100 feet (32705). <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 at 35251 South Koster on <br />October 28, 2021. The sample was analyzed for nitrate and dibromochloropropane <br />(DBCP) per San 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 water sample at a concentration of 5.4 mg/L-N. DBCP was <br />not detected. The laboratory analytical results are attached as Appendix 5 of this <br />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 />Although nitrate is a naturally -occurring compound necessary for plant growth, it can <br />cause health problems when present at high levels in drinking water. The most <br />common health effect of nitrates in water is methemoglobinemia, or blue baby <br />syndrome, which results in reduced oxygen supply to vital tissues. Pregnant women <br />LOGE 2141 Page 4 <br />