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June 10,2002 <br /> Job Number:LG02-164 <br /> Page 6 <br /> VI. GEOLOGY, SOILS,AND PERCOLATION TEST <br /> The surface geology at the site is shown on Pages's'map and is composed of Continental <br /> rocks and deposits,recent to Miocene age(Plate#)6 These deposits are composed of a <br /> heterogeneous mix of generally poorly sorted clay, silty, sand, and gravel; some beds of <br /> claystone, siltstone, sandstone, and conglomerate. <br /> The majority of surface soils located at the site are reported to be the Veritas fine sandy <br /> loam (no. 266) located on approximately the west half of the site and the Manteca fine sandy <br /> loam (no. 196) on the east half of the site (Plate$)VThe Manteca fine sandy loam is described <br /> by the San Joaquin County Soil Survey as a moderately well drained, nearly level soil on low <br /> terraces and is moderately deep to a hardpan. It formed in alluvium derived form mixed rock <br /> sources. The permeability is moderate in the Manteca soil. The Veritas fine sandy loam is <br /> described as a moderately well drained, nearly level soil that forms on low fan terraces. It is <br /> deep to a hardpan and formed in alluvium derived from mixed rock sources. Permeability is <br /> moderately rapid in the Veritas soil. <br /> Table 4. <br /> Selected Soil Properties <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 /> Manteca fine sandy 0-11:Fine sandy loam SM <2 7.4-8.4 Severe: <br /> loam,0 to 2 percent 11-24:Fine sandy SM,SC-SM <2 7.4-8.4 cemented pan. <br /> slopes, 196. loam,loam,sandy <br /> loam <br /> 24-35:Indurated — <br /> 35-54:Cemented — <br /> 54-74: Stratified loamy SM 2 7.4-8.4 <br /> sandy to loam. <br /> 5 Page,R.W., 1986,Geology of the fresh ground-water basin of the Central Valley,California,with texture <br /> maps and sections:U.S.Geologic Survey Professional Paper 1401-C,Scale 1:500,000. <br /> 6 USDA Soil Conservation Service,Soil Survey of San Joaquin County,California, Sheet 31. <br /> ?pE RSO <br /> y <br /> z .. <br /> o � <br /> ass oc� <br />