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L <br /> r) <br /> FApril 1,2005 <br /> NOA Project.Number: E05034A <br /> In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) wells <br /> throughout the Sacramento Valley by Bryan (1923). It was thought that ground water at that time <br /> was close to "natural" conditions. Based on the work by Bryan, it is estimated that under "natural" <br /> conditions,ground water concentration containing nitrate is no more then about 13.5 mg/L-NO3 (3 <br /> -- mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in which nitrate <br /> concentrations may be increasing (Hull, 1984). <br /> DBCP w e 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 /> /A4.5 Well Water Sample Collection, Handling, and Transportation <br /> The 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 /> �.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 Bellota Quadrangle as within the <br /> Quaternary Modesto Formation. .Quaternary.Modesto Formation-(upper member)- Foothill-derived <br /> alluvial silt, clay,and minor sand forming.terraces,upper fans and following distributaries across <br /> lower fans; abundant volcanic detritus (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Surrvy <br /> to be composed of Ramoth sandy loam, 5-8% slopes,Tokay fine sandy loam, 0-2% slopes and Vina <br /> fine sandy loam, 0-2% slopes (Plate 8) (USDA, 1992). Table 3 presents some selected properties of <br /> these soils: <br /> P <br /> 6 <br /> F1 <br />