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October 13,2004 <br /> ` NOA Project Number: E040112B <br /> 4.2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, <br /> and storm water infiltration. Any past agricultural activities and the present use of septic systems in <br /> the area should be considered potential ground-water contamination sources. <br /> It should be noted that Mr. Fraser, the former owner, stated that the Site was once used as a hog <br /> ranch. He also indicated that an adjacent parcel was a dairy for many years (personal <br /> communication, October 6,2004). Both land uses can contribute to nitrate contamination. <br /> 4.3 Water Sample Location <br /> No wells exist on the Site. No records of wells were found during file review at EHD on October 5, <br /> 2004. Because no wells exist, no water sample was collected for this report. %3_Z(,`) <br /> � l <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the CDMG (1991) geology map as within a region of late Pleistocene <br /> Modesto Formation. This map unit consists of unweathered gravel, sand and silt (Plate 7). <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Sun)9 <br /> to be composed of Jacktone clay, 0-2% slopes, (Plate 8) (USDA, 1992). Table 3 presents some <br /> selected properties of the soil: <br /> — Table 3. <br /> —San Joaquin County Soil Survey— <br /> Selected Soil Properties of On-Site Soils. <br /> Soil Name Depth Unified Soil Classification Salinity Soil Perme- Septic tank <br /> and Map (in) mmhos/c Reaction ability absorption <br /> Symbol I <br /> In pH (in/hr) fields <br /> Jacktone 0-22: Clay,CL,CH. <2 6.6-8.4 0.06-0.2 Severe: <br /> clay,0-2% 22-34: Clay loam,clay,silty clay,CL,CH. <2 7.9-9.0 0.06-0.2 cemented <br /> slopes,180. 34-37: Indurated --- --- --- pan,peres <br /> 37-46: Loam,clay loam <2 7.9-9.0 0.2-0.6 slowly <br /> 46-60: 1 Cemented --- --- <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 5 "'04 <br />