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May 25,2001 <br /> Job Number:LGOl-115 <br /> Page 6 <br /> VI. GEOLOGY, SOILS,AND PERCOLATION TEST <br /> The surface geology at the site is shown on Marchand and Atwater's maps and is <br /> composed of the Holocene and(or)upper Pleistocene age alluvium of middle and upper <br /> members of the Riverbank Formation(Plate 6). The Riverbank is generally composed of alluvial <br /> sand, silt, and other material composed of volcanic detritus and glacial outwash. The origin is <br /> the Sierra Nevada foothills and mountains. <br /> The surface and near surface soils located across the site are reported to be San Joaquin <br /> Soils (no's 238 and 239) (Plate 3)1. The San Joaquin Series Soil is described as... "moderately <br /> well drained soils on low terraces and dissected terraces. These soils are moderately deep to a <br /> hardpan. They formed in alluvium derived from dominantly granitic rock sources. Slope ranges <br /> from 0 to 8 percent" Table 3 presents some selected properties of the San Joaquin Series Soils. <br /> Table 3. <br /> Selected Soil Properties of the San Joaquin Series Soil. <br /> San Joaquin County Soil Survey Report.' <br /> Soil Name and Map Depth(in) Unified Soil I Salinity Soil Septic tank <br /> Symbol Classification mmhos/cm Reaction absorption <br /> PH fields <br /> San Joaquin loam, 0-16:Loam. CL-ML,ML <2 5.6-6.5 Severe: <br /> 238 and 239. 16-26: Clay loam,clay. CL <2 6.1-7.8 cemented pan, <br /> 26-60:Indurated. — — — peres slowly. <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> A total of six (6) 25-foot deep soil borings were drilled on each newly configured parcel <br /> to characterize the subsurface conditions and measure the percolation rate at each location. Plate <br /> I identifies the locations where the soil borings and percolation tests were conducted. Plates 8 <br /> through 13 describe the soils encountered. Essentially, a light to dark brown or reddish fine to <br /> 5 Marchand,D.E.,and Atwater,B.F. 1979,Preliminary geologic map showing Quaternary deposits of the <br /> Lodi Quadrangle,California:U.S.Geologic Survey Open File Report OFR 79-933,Scale 1:62,500. <br /> 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, Sheet 6. <br /> Zai <br />