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Water Sample Live Oak collected a water sample from the domestic v�U on the Site on December 6, % 2010. 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 Environmental, Stockton. Nitr below he Uecsample at a concentratio f 23.7 m L- NO3. This result is wel ! S EPAMaximum Contaminant eve (MCL for nitrate of 45 mg/L. ApplicN itr !e is ommo n ly detected in shallow ground water aq ers of the Central Valley. rtilizers, 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, 1984). DBCP was detected in the sample at a concentration of 0 39 µg/L. is result exceeds the US EPA MCL of 0.2 parts per billion (ppb; equivalent to µg/ . The U9,EPA set the:)I MCL at 0.2 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. 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. Soil Profile and Geologic Information The Site is mapped on the Geologic Map of California, San Jaffe sheet(tigers, 1966). It is depicted within a map unit of recent Great Valley fan =ed The surface and near surface soils located at the Site aUSDA Web Soil Survey to becomposed of Delhi loamy sand, 0 to 2 percent slopes, and Veritas fine sandy loam, 0 to 2 percent slopes (Plate 8) (USDA, 2009). The table below presents some selected properties of these soils: LOGE 1103 Page 4