Laserfiche WebLink
April 24, 2006 <br /> NCA Project Number: E06015A <br /> DBCP was not detected in the water sample. DBCP is a nematocide and soil fumigant for <br /> vegetables and grapes. It is thought to cause health problems consisting of kidney damage,liver <br /> L damage,and cancer. The use of DBCP was discontinued in 1979. The Environmental Protection <br /> Agency (EPA) set the maximum contaminant limit (MCL) at 0.2 parts per billion (ppb) because the <br /> EPA believes that given present technology and resources,this is the lowest level to which water <br /> e <br /> systems can reasonably be required to remove this contaminant should it occur in drinking water. <br /> 4.5 Well Water Sample Collection, Handling, and Transportation <br /> IThe nitrate sample was collected in a sterile plastic container,the DBCP sample was collected in two <br /> ` sterile glass vials. The samples were then transported on ice and remained under chain of custody to <br /> LFGL Environmental,Stockton. <br /> 4.6 Chain of Custody <br /> The Chain of Custody document has been included in the appendix of this report. 6/0 <br /> t <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> L The Site is depicted on the USGS Geologic Map of the San Francisco-San Jose Quadrangle(199 1) as within <br /> the Quaternary Modesto Formation (Plate 7). These map units represent arkosic alluvium forming <br /> Mokelumne River terraces, channel ridges and alluvial fans. The alluvium is a tan and light-gray <br /> gravely sand, silt and clay except where derived from volcanic rocks when it is distinctly red and <br /> black with minor brown clasts. <br /> The surface and near surface soils located at Site are reported by the San Joaquin County Soil Su>vy to <br /> L be composed of Urban Land. The surrounding areas are reported to consist of Jacktone clay, 0 to 2 <br /> percent slopes, and Stockton clay, 0 to 2 percent slopes (Plate 7) (USDA, 1992). Table 3 presents <br /> some selected properties of these soils: <br /> L <br /> L <br /> L <br /> 6 <br />