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The sample was placed on ice and transported under chain of custody to FGL <br /> Environmental, Stockton. Results of the tests are forthcoming. <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 (3 mg/L-N). Nitrate may be <br /> increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (Hull, <br /> 1984). <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) because it believes that given present technology <br /> and resources, this is the lowest level to which water systems can reasonably be <br /> required to remove this contaminant should it occur in drinking water. The Maximum <br /> Contaminant Level Goal (MCLG) for DBCP is zero. <br /> Soil Profile and Geoloctic Information <br /> The Site is depicted on the Preliminary Geologic map of Cenozoic Deposits of the <br /> r Bellota Quadrangle, California (Marchand and Atwater, 1979). The Site is depicted on <br /> J map units of the Modesto and Riverbank Formations. The Modesto Formation map unit <br /> represents "arkosic alluvium forming Mokelumne River terraces and alluvial fans; chiefly <br /> sand with minor gravel and silt; probably glacial outwash." The Riverbank Formation <br /> reap unit represents "arkosic alluvium forming Mokelumne River alluvial fan; chiefly <br /> sand; probably glacial outwash" (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Acampo sandy loam, 0 to 2 percent slopes, Exeter <br /> sandy loam, 0 to 2 percent slopes, San Joaquin loam, thick surface, 0 to 2 percent <br /> slopes, and Tokay fine sandy loam, 0 to 2 percent slopes (Plate 8) (USDA, 2009). The <br /> table below presents some selected properties of these soils: <br /> LOG El003 Page 4 <br />