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On-Site Wells One domestic well and one irrigation well exist on the Site. Two well permits were identified for the Site at the San Joaquin County Environmental Health Department: • April 2005 permit for new domestic well. • September 2005 permit for pump replacement at domestic well. 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. Nifra etected at a concentration of 10.5 mg/L-N ini'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 j shallow ground water zones. Based on work in the Sacramento Valley from the earl`�/ 1900s, it is estimated that under "natural' conditions, ground water contains nitrate a't concentrations no more then about 13.5 mg/L-NO3 (3 mg/L-N). Nitrate may b increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (H I, 198a�e US-Ep,4 has set the Maximum Contaminant Level (MCL) for nitrat as nitrogep at'10 mg/L. r 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 is a nematocide and soil fumigant for vegetables and grapes. It is known to cause male reproductive effects and is classified as a probable human carcinogen. Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set the MCL at 0.2 parts per billion (ppb, equivalent to µg/L) because it believes that given LOGE 1515 Page 4