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Mr.Steven Malcoun <br /> December 9,2003 <br /> L Page 7 <br /> nitrate 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 /> Agency(EPA) set the maximum contaminant limit (MCL) at 0.2 ug/L(parts per billion)because <br /> the EPA believes that given present technology and resources,this is the lowest level to which <br /> water systems can reasonably be required to remove this contaminant should it occur in drinking <br /> water. <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> ` 5.1 Geology <br /> The surface geology at the Site is shown Marchand and Atwater, and is composed of Holocene <br /> ` alluvium channel and levee deposits (Plate 6). <br /> 5.2 Soil Properties in the Vicinity <br /> The surface and near surface soils located at Site are reported to be composed of Columbia fine <br /> sandy loam, 0 to 2 percent slopes (Soil no. 130)(Plate 7) (USDA, 1992). Table 3 presents some <br /> �. selected properties of this soil. <br /> Table 3. <br /> Selected Soil Properties of the Columbia Fine Sandy Loam <br /> San Joaquin County Soil Survey Report. <br /> Soil Name and Map Depth(in) Unified Soil Salinity Soil Septic tank <br /> Symbol Classification mmhos/cm Reaction absorption <br /> PH fields <br /> Columbia fine sandy 0-12:Fine sandy loam. SM,SC-SM <2 6.1-7.8 Moderate: <br /> loam,0 to 2 percent 12-60: Sandy clay SM,SC-SM <2 6.1-7.8 flooding,peres <br /> slo es, 130. loam slowl <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> r <br /> 5.3 Soil Lithology Observed and Septic Applicability <br /> Generally, the soil encountered in the borings is similar to the soils reported by the San Joaquin <br /> �OFRSO <br /> y <br /> i <br /> .n <br /> Z � <br /> O <br /> �150C� <br />