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I <br /> F F1 <br /> {{!! Fe ry 28, 2007 <br /> OA Project Number: E07023A <br /> 4.2 Potential Ground Water ContaminationIss <br /> ntifying potential ground- „ ter.,contarriuration sources was not part of the scope of work for the <br /> soil s- "StuarT70tential ground-water contamination can occur from a number of sources <br /> which often include leaky underground storage tanks, agricultural activities, dairies, septic systems <br /> k and storm water infiltration. Agricultural activities and the use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> F.jj 4.3 Water Sample Location <br /> _+ <br /> According to Dave Silva there are two wells on site. One well is domestic and the other is <br /> , agricultural.A sample was taken from the faucet of the domestic well on February 8, 2007. The <br /> 1 results of the water sample are forthcoming. <br /> i <br /> k � <br /> 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION <br /> The Site is depicted on the California Geological Survey Geologic Map of Ceno.Zoic Deposits of the San <br /> Francisco-San Jose Quadrangle(1991) as within the Quarternary Modesto Formation. The Modesto <br /> Formation consists of Arkosic alluvium forming Mokelumne River terraces and alluvial fan; chiefly <br /> sand with minor gravel and silt;probably glacial outwash (Plate 7). <br /> 1. <br /> The surface and near surface soils located at the Site are reported by the San Joaquin County Soil Survey <br /> to be composed of Honcut sandy loam,Manteca fine sandy loam, Tinnin loamy coarse sand and <br /> } Veritas, all 0-2% slopes (Plate 8) (USDA, 1992). Table 3 presents some selected properties of these <br /> sails: <br /> Table 3. <br /> San Joaquin County Soil Survey <br /> r j Selected Soil Properties of On-Site Soils. <br /> Soil Name Soil Perme- Septic tank <br /> and Map Depth Unified Soil CIassification SaLmry Reaction ability absorption <br /> Symbol (m) mmhos/cm pH (in/hr) fields <br /> Honcut 0-21: Sandy loam;SM <2 6.1-7.3 2.0-6.0 Slight <br /> F sandy loam, 21-60: Coarse sandy loam,sandy loam; <2 6.1-7.8 2.0-6.0 <br /> 0-2% SM <br /> slopes,175. <br /> w <br /> s, <br /> K <br /> R <br /> 9 <br /> 1- <br />