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On-Site Wells <br /> A domestic well and an irrigation well serve the Site (Plate 3). One well permit was <br /> identified for the Site at the San Joaquin County Environmental Health Department: <br /> • November 1972 permit for new irrigation well. <br /> ■ July 1990 permit for replacement domestic well. <br /> ■ January 2005 permit for destruction of pit well (located in pump house shed <br /> southwest of main house). <br /> These permits are included in Appendix 3. <br /> Water Sample <br /> Ms. Paskett provided Live Oak with water test results for the domestic well on the Site. <br /> FarWest Laboratories, Inc. of Riverbank, California, collected a water sample on August <br /> 5, 2015. <br /> Nitrate was detected at a concentration of 4.2 mglL-NO3 in the water sample. <br /> Dibromochloropropane (DBCP) was not detected in the sample. <br /> Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. <br /> Application of fertilizers, livestock waste, and untreated septic tank waste can all <br /> contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in <br /> shallow ground water zones. Based on work in the Sacramento Valley from the early <br /> 1900s, it is estimated that under "natural" conditions, ground water contains nitrate at <br /> concentrations no more then about 13,5 mg/L-NO3 (equivalent to 3.0 mg/L-N), Nitrate <br /> may be increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or <br /> more (Hull, 1984). The US EPA has set the Maximum Contaminant Level (MCL) for <br /> nitrate as N at 45 mglL-NO3 (10 mg/L-N). <br /> DBCP is a nematocide and soil fumigant for vegetables and grapes. It is known to <br /> cause male reproductive effects and is classified as a probable human carcinogen. <br /> Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set <br /> the MCL at 0.2 parts per billion (ppb, equivalent to ug/L) because it believes that, given <br /> present technology and resources, this is the lowest level to which water systems can <br /> reasonably be required to remove this contaminant should it occur in drinking water. <br /> The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. <br /> The laboratory analytical results are attached as Appendix 5 of this report. <br /> LOGE 1729 Page 4 <br />