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` February 25, 2002 <br /> Job Number: LGOI-397 <br /> Page 6 <br /> 6. (ppb)because the EPA believes that given present technology and resources, this is the lowest <br /> level to which water systems can reasonably be required to remove this contaminate should it <br /> ` occur in drinking water! <br /> VI. GEOLOGY, SOIL,AND PERCOLATION TESTS <br /> �E The surface geology of the eastern part of San Joaquin County and the site is shown on <br /> Marchland's and Bartow's (1979)geologic map (Plate 6). The surface material has been <br /> identified as the Upper Member of the Modesto Formation and is of Pleistocene age 5 The <br /> Upper member of the Modesto Formation is reported to consist of foothill derived alluvial silt, <br /> clay, and minor sand forming terraces upper fans,and following distributaries across lower fans. <br /> (Plate 6).5 <br /> The surface and near surface soils located at the proposed project location are reported to <br /> 6' be the Finrod clay loam by the San Joaquin County Soil Survey Report.' The following is an <br /> excerpt of selected engineering properties for the Finrod clay loam soil. <br /> Table 3. Selected Soil Properties of the Finrod Clay Loam Soil. <br /> (San Joaquin County Soil Survey Report') <br /> Soil Name and Depth(in) Unified Soil Salinity Soil Septic tank <br /> Map Symbol Classification mmhos/cm Reaction absorption <br /> PH fields <br /> Finrod clay 0-8: Clay loam. CL <2 6.6-7.8 Severe:peres <br /> loam,0 to 2 8-33: Clay loam,clay.. CL,CH <2 6.6-7.8 slowly. <br /> percent slopes, 3348: Silty clay loam, CL,CH <2 7.48.4 <br /> ._ 158. clay loam. <br /> 48-60: Cemented <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> EPA, 1999,Drinking water and health,National Primary Drinking Water Regulations,consumer fact <br /> 6. sheet on:DIBROMOCHLOROPRPOANE. Internet:http://www.epa.gov./OGWDW/dwh/c-soc/dibromoc.html <br /> 5 Marchand,D.E.,and Bartow,J.A., 1979,Preliminary geologic map of Cenozoic deposits of the Bellota <br /> r Quadrangle,California:U.S.Geologic Survey Open File Report OFR-79-664,Sheets,Scale 1:62,500. <br /> 6 Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California: U.S.Department of <br /> V, Agriculture,Soil Conservation Service.,Sheet 13. <br /> .=pE9Soh <br /> i <br /> Z <br /> 150 <br />