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January 16,2004 <br /> Job Dumber:LG03-304 <br /> Page 8 <br /> 5.0 SOIL PROFILE AND-GEOLOGIC INFORMATION <br /> 5.1 Geology . <br /> The surface geology.at the Site is the Pleistocene Modesto Formation (Page 1986). The Modesto <br /> Formation consists of mixtures of sand, silt, and clay. <br /> 5.2 Soil Properties in the'Vicinity <br /> The surface and near surface soils located at Site are reported to be composed of Capay=Urban <br /> 'land complex, Oto 2 percent slopes.(Plate'3) (USDA, 1992); Table.2 presents some selected <br /> properties of this soil and those in the vicinity of the Site. <br /> Table 2. <br /> Selected.Soil Properties of the Surrounding Area ' <br /> San Joaquin County Soil Survey Report. <br /> Soil Name and Map Depth.(in) ,. Unified Soil Salinity Soil Septic tank. <br /> Symbol Classification mmhoslcm Reaction absorption <br /> : pH fields <br /> Capay=Urban.land 0-20: Silty clay loam. CH; CL <2' 6.6-8.4 Severe:peres <br /> complex,0 to'2 20-60:'Clay loam,silty CL;C11 <2 6.6-9.4 slowl <br /> percent slopes, 122. clay.loam <br /> Note, The table descriptions do not necessarily reflect site-specific soil properties. _ <br /> " 5.3 Soil_Litholog3Observed'and Septic,Applicability <br /> Generally,-the.soil encountered in the'borings is similar'in description to the soil reported by the . <br /> San-Joaquin County Soil Survey.soil.for the area(USDA,.1992). Table 3 presents the soil log for <br /> the 9.5 foot soil boring. <br /> Table 3. <br /> Soil Profile l3oring-Log for P-1. <br /> Depth Interval(ft) Soil Type. Unified Soil Classification <br /> 0-9.5 Brown clayey silt ML <br /> F <br /> Though fine-grained soils were.encouritered•during the drilling of the dee ercolation test ; , <br /> boring the percolation rates-- described later in the report appear to be satisfactory for the <br /> P ' <br /> QfSO�� <br />