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Fi <br /> November 3, 2005 <br /> NOA Project Number: E05123A <br /> DBCP was not found in the water sample. DBCP is a nematocide and soil fumigant for vegetables <br /> and grapes. It is thought to cause health problems consisting of kidney damage,liver damage, and <br /> cancer. The use of DBCP was discontinued in 1979. The Environmental Protection Agency (EPA) <br /> set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the EPA believes <br /> that given 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 /> FjThe samples were collected in a sterile plastic container and two sterile clean glass vials. The <br /> samples were then transported on ice and remained under chain of custody to Precision Enviro- <br /> Tech, Stockton. <br /> - 4.6 Chain of Custody <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 Preliminary Geologic Map of the Bellotti Quadrangle as within the <br /> Quaternary Modesto Formation and Quaternary Riverbank Formation. (Plate 7). The following <br /> table describes the units found on the site. <br /> Table 3. <br /> Geologic Units. <br /> Symbol Name Unit <br /> k[ Qm2f Quaternary Modesto Foothill-derived alluvial silt,day,and minor sand forming <br /> Formation(upper member) terraces,upper fans and following distributaries <br /> across lower fans;abundant volcanic detritus <br /> Qm2fb Quaternary Modesto Foothill-derived basin and interdistributary overbank deposits; <br /> Formation (upper member chiefly clay and silt <br /> 1f <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> to be composed of Stockton clay, 0-2% slopes (Plate 8) (USDA, 1992). Table 4 presents some <br /> selected properties of these soils: <br /> R <br /> 1_? <br /> 6 <br /> F ! <br /> i " <br />