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August 3, 2004 <br /> NOA Project Number: E04081A <br /> under "natural" conditions, ground water concentration containing nitrate is no more then <br /> about 13.5 mg/L-NO3 (3 mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are <br /> those in which nitrate concentrations may be increasing (Hull, 1984). <br /> DBCP is a nematocide and soil fumigant for vegetables and grapes. It is thought to cause <br /> health problems consisting of kidney damage, liver damage, and cancer. The use of DBCP <br /> was discontinued in 1979. The Environmental Protection Agency (EPA) set the maximum <br /> contaminant limit (MCL) at 0.2 parts per billion (ppb) because the EPA 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 /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> /5.1 Geology <br /> The Site is depicted on the USGS Preliminary Map Showing Quaternary Deposits of the Lodi <br /> Quadrangle, California (Marchand and Atwater, 1979) as within a region of the upper member <br /> of the Pliestocene Modesto Formation and a part of this formation that probably has an eolian <br /> (wind blown) source. This unit is composed of arkosic alluvium forming Mokelumne River <br /> terraces and low dunes on the Mokelumne River fan (Plate 7). <br /> 5.2 Soil Properties in the Vicinity <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County <br /> Soil Survey to be composed of Tokay fine sandy loam, 0 to 2 percent slopes, with a small area <br /> of Tujunga loamysand, 0 to 2 percent slopes (Plate 8) (USDA, 1992). Table 4 presents some <br /> selected properties of these soils: <br /> r <br /> 8 <br />