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• On-Site Wells <br /> A domestic is currently located on the Site. <br /> One well permit was identified for the Site from among the San Joaquin County <br /> Environmental Health Department permit files. The permit, dated September 2003, was <br /> for pump replacement at a domestic well. It has been attached to this report. <br /> Water Sample <br /> Live Oak collected a water sample from the domestic well on the Site on March 20, <br /> 2018. The sample was analyzed for nitrate per San Joaquin County Environmental <br /> Health Department policy. <br /> As required by the laboratory, the sample was collected in a plastic container. The <br /> 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 9.5 mg/L-N. <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 13.5 mg/L-NO3 (3 mg/L-N). Nitrate may be <br /> increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (Hull, <br /> 1984). The US EPA has set the Maximum Contaminant Level (MCL) for nitrate as <br /> nitrogen at 10 mg/L. <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 bluish <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 1818 Page 4 <br />