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,(ILS <br /> �r activities and the use of septic systems in the area are known ground water <br /> contamination sources with the potential to impact the Site. <br /> On-Site Wells <br /> C3� One domestic well exists on the Site, as depicted on Plate 2. Two well permits were on <br /> file at the San Joaquin County Environmental Health Department. The first permit, <br /> dated 1988, is for the installation of a new pump at an existing domestic well. The <br /> second permit, dated 1994, is also for pump replacement at the well. The permits are <br /> included in Appendix 4. <br /> Water Sample <br /> A water sample was collected from the domestic well on the Site on June 4, 2010 by 3) <br /> David Welch. The sample was analyzed for Nitrate and dibromochloropropane (DBCP) <br /> per San Joaquin County Environmental Health Department policy. � J <br /> As required by the laboratory, the sample was collected in a plastic container and two <br /> glass vials for nitrate and DBCP analysis, respectively. A trip blank was also utilized. <br /> The sample was placed on ice and transported under chain of custody to FGL <br /> Environmental, Stockton. <br /> Pwthe <br /> was detected in the water sample at a concentration f 16.9 NO3, well <br /> Maximum Contaminant Level (MCL) set by the U 45 g/L-NO3. <br /> Nitrate is commonly detected in shallow ground water aquifers of the entral 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 mgIL-NO3 (3 mg/L-N). Nitrate may be <br /> increasing in areas with concentrations of 24.75 mgIL-NO3 (5.5 mg/L-N) or more (Hull, <br /> 198t4L <br /> DBCP as detected in the water sample at a concentration 0.1 �5ntocausemale <br /> DBCP is a <br /> atocide and soil fumigant for vegetables and grapes. It is <br /> reproductive effects and is classified as a probable human carcinogen. Most domesti <br /> use of DBCP was discontinued in 1977 through 1979. The US EPA set the�L atm <br /> µglL because it believes that given present technology and resources, this is th I west <br /> level to which water systems can reasonably be required to remove this contaminant <br /> should it occur in drinking water. The Maximum Contaminant Level Goal (MCLG) for <br /> DBCP is zero. <br /> LOGE1013 Page 4 <br />