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• On-Site Wells Three domestic wells, one for each house and one for the nursery, are located on the Site. Four well permits were identified for the Site at the San Joaquin County Environmental Health Department: • September 1999 permit for new domestic well at new house (23585). • November 2001 permit for new domestic well at new house (23601). • August 2002 permit for pump replacement at domestic well (23585). • July 2004 permit for new domestic well (at the nursery). Two existing wells are also depicted (23601). These permits are included in Appendix 4 of this report. Water Sample Live Oak collected a water sample from the domestic well on the Site on July 12, 2017. 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 in the sample at a concentration of 6.6 mg/L-N. DBCP was not detected in the water 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. 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 1718 Page 4