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9 <br /> lr <br /> June 23, 2006 <br /> NOA Project Number: E06058B <br /> j mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate <br /> L• concentrations may be increasing (Hull, 1984). <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 /> damage, and cancer. The use of DBCP was discontinued in 1979.The Environmental Protection <br /> L 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 /> systems can reasonably be required to remove this contaminant should it occur in drinking water. <br /> L /4.5 Well Water Sample Collection,Handling, and Transportation <br /> L The 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 /> FGL Environmental, Stockton. <br /> i <br /> /.6 Chain of Custody <br /> The Chain of Custody document has been included in the appendix of this report. <br /> L <br /> L1.O SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the USGS Preliminary Geologic Map of the Bellota Quadrangle as within the <br /> Quaternary Riverbank Formation. Quaternary Riverbank Formation (upper and middle members) <br /> these units are arkosic alluvium forming Mokelumne River terraces and alluvial fan; chiefly sand; <br /> probably glacial outwash lower fans;abundant volcanic detritus (Plate 7). <br /> LThe surface and near surface soils located at the Site are reported by the San Joaquin Connty Soil Survey <br /> to be composed of Bruella sandy loam, hard substratum, 0-2% slopes and San Joaquin loam, thick <br /> L surface, 0-2% slopes (Plate 8) (USDA, 1992). The following table presents some selected properties <br /> of these soils: <br /> L <br /> L <br /> L <br /> - - 6 <br /> top '0004 <br /> 6. <br />