Laserfiche WebLink
33503 S Koster Road Project No.2021-00073 Page 13 <br /> 3.0 GEOLOGIC AND SOIL PROFILE INFORMATION <br /> 3.1 Chemical and Physical Soil Properties <br /> The Site is depicted on the Geologic Map of the San Francisco-San Jose Quadrangle4 and falls <br /> within the alluvial fan deposits (Qf) of the Holocene. Qf is a unit of unconsolidated to locally <br /> cemented, undissected deposits of gravel and sand that form active parts of alluvial fans <br /> (Plate 3,Appendix A). <br /> The surface and near surface soils located at the site are reported by the San Joaquin County <br /> Soil Survey5 to be composed of the E1 Solyo clay, and Capay clay, 0-2 percent slopes (Plate 4, <br /> Appendix A). The table below presents some selected properties of these soils: <br /> Table 1. <br /> San Joaquin County Soil Survey <br /> Elected Soil Properties of On-Site Soils <br /> Soil Name Depth Salinity Soil Perme- Septic tank <br /> and Map Unified Soil Classification mmhos Reaction ability absorption <br /> Symbol (1n) /cm pH (in/hr) fields <br /> Capay clay, 0-20: Clay; CL, CH <2 6.6 -8.4 0.06 - 0.2 Severe: <br /> 118 20-44: Clay, Silty clay; CL, CH <2 6.6 -8.4 0.06 - 0.2 peres <br /> slowly. <br /> El Solyo 0-10: Clay; ML, CL <2 6.6 - 7.8 0.2 - 0.6 Severe: <br /> Clay loam 10-60: Silty clay loam, silty clay; <2 7.4-8.4 0.06 - 0.2 peres <br /> 156 ML, CL, CH slowly. <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> *See description of the map unit for composition and behavior characteristics of the map unit <br /> 3.2 Mass Transport Soil Properties <br /> The clay and silty clay loam soil such as the layers reported for the San Joaquin soil at the site <br /> typically provide a high degree of protection between percolating effluent at the surface and <br /> 4 Wagner,D.L.,Bortugno,E.J.,and McJunkin,R.D,1991.Geologic Map of the San Francisco Quadrangle,California,California Division of <br /> Mines and Geology Map 5A.1:250,000 <br /> 5 United States Department of Agriculture.Soil Survey of San Joaquin County,California.October 1992. <br /> Petralogix Engineering,Inc. <br /> 26675 BruelIa Road,Galt.Ca 95632 <br /> [209j-40o-5729 <br /> www.petralogix.com <br />