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On-Site Wells According to Mr. Gash, one domestic well exists on the Site (Plate 2). One well permit was identified at San Joaquin County Environments artment. The permit, dated January 2006, is for the installation of a domestic to the south of the residence. This permit is included in Appendix 4. Water Sample Live Oak collected a water sample from the domestic well on the Site on February 20, 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 C`f 5) Environmental, Stockton. Nitrate was detected at a concentration o 6.6 mg/L-NO3' the water sample. Nitrate is commonly detected in shallow ground wat 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, 19� US EPA has set the Maximum Contaminant Level (MCL) for nitrate as NO3 m DBCP was detected in the sample at a concentration of 24 L DBCP is a nematocide and soil fumigant for vegetables and grapes. It ' to cause male reproductive effects and is classified as a probable human carcinogen. Most do tic use of DBCP was discontinued in 1977 through 1979. The US EPA set the at 0 parts per billion (ppb, equivalent to µg/L) because it believes that given present technology and resources, this is the lowest level to which water systems can reasonably be required to remove this contaminant should it occur in drinking water. The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. The laboratory analytical results are attached as Appendix 5 of this report. G, (A41� OF C�[STQLY�Ferry — 4' IGs,4jj� �"� LOGE 1301 Page 4