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Contaminant Level (MCL) set by the US EPA for nitrate as NO3 is 45 mg/L; the MCL for DBCP is 0.2 µg/L. On-Site Wells As indicated on the site map (Plate 3), one domestic water well exists on the Site. An older well was destroyed in 1999. Two well permits were identified at the San Joaquin County Environmental Health Department for the Site addresses: • August 1972 permit for pump installation at domestic well (21387 N. Cord). • December 1999 permit for destruction of well next to tower (21411 Cord: main house). These permits are included in Appendix 4. Water Sample Live Oak collected a water sample from the domestic well on October 9, 2013. The 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. Nitrate was detected in the water sample at a concentration o(19.2 mgA-. Nitrate is commonly detected in shallow ground water aquifers of the Centr9tvatley. 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, 1984he US EPA has set the Maximum Contaminant Level (MCL) for nitrate as NO3 at 45 mg/ (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. .. i nrlc 11213q Pane 4