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i On-Site Wells Two domestic wells and one irrigation well exist on the Site. Four well permits for the Site were identified at the San Joaquin County Environmental Health Department. • July 1976 permit for reconditioning of irrigation well. • March 2002 permit for a new domestic well at the western residence. • September 2004 permit fer a ne omestic well at the eastern residence. • February 2005 permit -w pump t the eastern residence's domestic well. These permits are includ in Appendix 4. Water Sample Live Oak collected one water sample from each of the domestic wells on the Site on November 29, 2010. The samples were to be analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. As required by the laboratory, each sample was collected in a plastic container and two glass vials for nitrate and DBCP analysis, respectively. A trip blank was also utilized. The samples were placed o.n—i --tt'ansported--unde� of custody to FGL Environmental, Stockton esults of the tests are forthcoming. Nitrate is commonly detecte un 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 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 mglL-N). Nitrate may be increasing in areas with concentrations of 24.75 mglL-NO3 (5.5 mg/L-N) or more (Hull, 1984). 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) 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. Soil Profile and Geologic Information The Site can be found on the Geologic Map of California, San Jose sheet (Rogers, 1966). It is depicted within a map unit of Plio-Pleistocene nonmarine deposits (Plate 7). LOGE1030 Page 4