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October 7, 1999 <br /> Job Number: S99226 <br /> Page 5 <br /> was part of the geotechnical investigation conducted for the same project.' No ground water was <br /> encountered. <br /> VL GEOLOGY, SOILS,AND THE PERCOLATION TESTS <br /> The geology of the area is reported to consist of alluvium of the Holocene and/or upper <br /> Pleistocene age Calaveras River and Vicinity. This group is composed of unconsolidated gravel, <br /> sand, silt, and clay. The Pleistocene age Modesto Formation is located less then about 1000 feet <br /> north west of the northwest portion of the property. The Modesto Formation underlies the <br /> Calaveras River and vicinity alluvium and is composed of unconsolidated gravel, sand, silt, and <br /> clay. The Modesto Formation is commonly fine-grained and wide spread in the Central Valley <br /> obtaining a thickness of about 100 feet. Because of the shallow and fine-grained nature of these <br /> deposits, they do not yield much water to wells and would impede the vertical movement of <br /> water.' The soils located on the site are reported to be the Rioblancho clay loam (Plate 7). The <br /> following is an excerpt of the engineering properties for the following soil.' <br /> Selected Properties from the Soil Survey of San Joaquin County, California' <br /> Soil Name Depth(in) Unified Soil Salinity Soil Septic tank <br /> and Map Classification in hos/cm Reaction absorption fields <br /> Symbol pH <br /> Rioblancho 0-16: Clay loam CL <2 7.4-8.4 <br /> clay loam, 16-28: Loam,clay loam CL-ML, CL <2 7.4-8.4 <br /> 226 28-39: Sandy loam, SC-SM, SM, <br /> loam, silt loam CL-ML,ML <2 7.9-8.4 Severe: Cemented <br /> _ 39-80: Cemented --- -- res slowl . <br /> Note: The table descriptions do not necessarily reflect site-specific soil properties. <br /> Generally, the soils at the site were found to consist of a Gray-brown sandy clay located <br /> ' Neil O. Anderson&Associates, 1999. Geotechnical Investigation,The Home Church 11451 N. West <br /> Lane,Lodi California. <br /> _ ' Page,R.W., 1986, Geology of the Fresh Ground-Water Basin of the Central Valley, California, with <br /> Texture Maps and Sections,USGS Prof.Paper 1401-C. <br /> ' USDA Soil Conservation Service, Soil Survey of San Joaquin County, California, sheet 8. <br /> r <br /> 'oats 1 <br /> .s <br />