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L `. <br /> September 10, 2004 <br /> 61 <br /> NOA Project Number: E040104A <br /> LDBCP 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 /> r 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 /> 4.5 Well Water Sample Collection, Handling, and Transportation <br /> The samples were collected in a clean plastic container, then decanted into clean, glass vials. <br /> The samples were then transported on ice and remanded under chain of custody to Precision <br /> 6. Enviro-Tech, Stockton. <br /> 4.6 Chain of Custody <br /> L <br /> The Chain of Custody document has been included in the appendix of this report. <br /> :. 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the USGS Geologic Map of the San Francisco-San Jose Quadrangle (1991) <br /> as within a region of Hollocene alluvium. This map unit consists of unweathered gravel, sand, <br /> and silt (Plate 7). <br /> L The surface and near surface soils located at the Site are reported by the San Joaquin County <br /> Soil Survey to be composed of Jacktone clay, 0 to 2 percent slopes, and Stockton clay, 0 to 2 <br /> `, percent slopes (Plate 8) (USDA, 1992). Table 5 presents some selected properties of these soils: <br /> r <br /> 7 I <br /> r <br /> 4 <br />