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On-Site Wells As indicated on the site map (Plates 3 and 4), one domestic water well exists on the Site. Two well permits were on file at the San Joaquin County Environmental Health Department for the Site: • December 1990 permit for pump replacement at domestic well. • June 2007 permit for pump replacement at domestic well. These permits can be found in Appendix 4. Water Sample Live Oak collected a water sample from the domestic well on December 6, 2011. The ( 3� sample was to be 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. CG> Nitrate s detected at a concentration,of 53.7 mgtL,-NO3 in the water sample. Nitrate mmonly 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 NO3 at 45 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. DBCP was not detected in a sample. DBCP is a nematocide and soil fumigant for e etables and grape . is known to cause male reproductive effects and is classified as a pro able human carcinogen. Most domestic use of DBCP was discontinued in `" LOGE 1112 Page 4