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The Maximum Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 ppm. The MCL for DBCP is 0.2 µg/L. On-Site Wells As indicated on the site map (Plates 3 and 4), two domestic wells and five irrigation wells exist on the Site. Three well permits were identified for the Site at the San Joaquin County Environmental Health Department: • February 1972 permit for repair to irrigation well. • March 1973 permit for pump replacement at domestic well (northern residence). • May 1974 permit for new domestic well (northern residence). Mr. Calosso indicated that there is only one well at this location. These permits are included in Appendix 4 of this report. Water Sample Live Oak collected a water sample from the domestic well at the northern building cluster on September 10, 2014. The sample was to be analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health � `fJ 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 14.8 mg/L-NO3 in 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 NO3 at 45 mg/L (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 LOGE 1419 Page 4