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February 4,2005 <br /> NOA Project Number: E040142A <br /> LDBCP is a nematocide and soil fumigant for vegetables and grapes. It is thought to cause health <br /> problems consisting of kidney damage,liver damage,and cancer. The use of DBCP was <br /> L discontinued in 1979.The Environmental Protection Agency (EPA) set the maximum contaminant <br /> limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes that given present technology <br /> and resources, this is the lowest level to which water systems can reasonably be required to remove <br /> this contaminant should it occur in drinking water. <br /> L 4.5 Well Water Sample Collection, Handling, and Transportation <br /> LThe samples were collected in a clean plastic container, then decanted into clean,glass vials. The <br /> samples were then transported on ice and remanded under chain of custody to Precision Enviro- <br /> Tech, Stockton. <br /> 4.6 Chain of Custody <br /> I <br /> L The Chain of Custody document has been included in the appendix of this report. <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> I The Site is depicted on the Preliminary Geologic Map of the San Francisco- San Jose Cenozoic <br /> L Deposits of the Tracy Quadrangle, California (1981), as within a region of Quaternary Fan Deposits <br /> and Quaternary Dos Palos Alluvium. The Fan Deposits are composed of gravel, sand silt and clay. <br /> The Dos Palos Alluvium is a unit of flood basin deposits: poorly sorted gravel, sand silt and clay <br /> (Plate 3. <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> Lto be composed of Capay clay,wet, 0-2 percent slopes and Willows clay,partially drained, 0-2 <br /> percent slopes (Plate 4) (USDA, 1992). Table 3 presents some selected properties of the soils: <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L 6 '-'04 <br /> L <br />