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On-Site Wells <br /> One domestic well is currently located on the Site. Two well permits were identified for <br /> the Site from among the files of the San Joaquin County Environmental Health <br /> Department: <br /> • May 2019 permit for replacement domestic well; the permit notes that the new <br /> well has a 200-foot grout seal. A soil log is included, which indicates alternating <br /> layers of clay and gravel/sand to a total depth of 266 feet. <br /> • May 2019 permit for destruction of old 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 July 2, 2019. <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 3.7 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 /> 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 /> and certain others can also develop methemoglobinemia. Symptoms include a blluish <br /> color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. <br /> Ingestion of high levels of nitrates over time can also lead to gastric problems. <br /> LOGE 1922 Page 4 <br />