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476 N Patton Avenue Project No. 2021-00084 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 Modesto Formation (Qm) of the Late Pleistocene. Qm is a unit of arkosic alluvium, <br /> sand with minor gravel and silt forming alluvial terraces, alluvial fans and abandoned <br /> channel ridges (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 Jacktone clay, and Hollenbeck silty clay, 0-2 percent <br /> slopes (Plate 4, Appendix A). The table below presents some selected properties of these <br /> soils: <br /> Table 1. <br /> San Joaquin County Soil Survey <br /> Elected Soil Properties of On-Site Soils <br /> Soil Name Salinit <br /> Depth Soil Perme- Septic tank <br /> and Map Unified Soil Classification y Reaction ability absorption <br /> Symbol (in) /cmo pH (in/hr) fields <br /> 0-22: Clay; CL, CH <2 6.6 -8.4 0.06 - 0.2 <br /> Severe: <br /> 22-34: Clay loam, silty clay; CL, CH <2 7.9 -9.0 0.06 - 0.2 <br /> Jacktone clay, cemented <br /> 180 34-37: Indurated --- --- an, eres <br /> 37-46: Loam,Clay loam; CL, ML <2 7.9 -9.0 0.2 - 0.6 p p <br /> slowly. <br /> 46-60: Cemented --- <br /> 0-10: Silty clay: CH, CL <2 6.6 -8.4 0.06 - 0.2 <br /> Hollenbeck 10-37: Clay, Silty clay; CH,CL Severe: <br /> silty clay 37-42: Silty clay loam, silty clay; CL <2 6.6 -8.4 0.06 - 0.2 peres <br /> <2 6.6 -8.4 0.2-0.6 <br /> 173 42-60: Cementedslowly. <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 /> 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 /> (209)-40o-5729 <br /> www.petralogix.com <br />