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On-Site Wells Three domestic wells and two irrigation wells exist on the Site. Six well permits were identified for the Site at the San Joaquin County Environmental Health Department: • January 1976 permit for pump replacement at domestic well (12385). • February 1977 permit for pump replacement at irrigation well. • October 1978 permit for pump replacement at irrigation well (12385; appears to be off-site). • August 1981 permit for pump replacement at domestic well (12385). • October 1981 permit for new domestic well to the north of old well (12385). • November 2003 permit for new irrigation well (12385). Copies of the permits have been included in Appendix 4 of this report. Water Sample Live Oak collected a water sample from the domestic well on August 25, 2015. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. As required by the laboratory, the sample was collected in a plastic container and two glass vials for nitrate and DBCP analysis, respectively. A trip blank was also utilized. The sample was placed on ice and transported under chain of custody to FGL Environmental, Stockton. Nitrate was detected at a concentration of 10.7 mg/L-N ir'the water sample. DBCP was not detected in the sample. Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. Application of fertilizers, livestock waste, and untreated septic tank waste can all contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in shallow ground water zones. Based on work in the Sacramento Valley from the early 1900s, it is estimated that under "natural' conditions, ground water contains nitrate at concentrations no more then about 13.5 mg/L-NO3 (3 mg/L-N). Nitrate may be increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (Hull, 1984). The US EPA has set the Maximum Contaminant Level (MCL) for nitrate as nitrogen at 10 mg/L-N. Although nitrate is a naturally-occurring compound necessary for plant growth, it can cause health problems when present at high levels in drinking water. The most common health effect of nitrates in water is methemoglobinemia, or blue baby syndrome, which results in reduced oxygen supply to vital tissues. Pregnant women and certain others can also develop methemoglobinemia. Symptoms include a bluish color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. Ingestion of high levels of nitrates over time can also lead to gastric problems. LOGE 1513 Page 4