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21300 MANN ROAD Project No.2019-00095 Pa g e 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 Bellota quadrangle4 and falls within the upper member <br /> Modesto Formation (Plate 4,Appendix A) herein called Qm2. Qm2 is an arkosic alluvium forming <br /> Mokelumne River terraces and alluvial fan; chiefly sand with minor gravel and silt. <br /> The surface and near surface soils located at the site are reported by the San Joaquin County Soil <br /> Surveys to be composed of the Kingdon fine sandy loam, 0-2 percent slopes (Plate S,Appendix A). <br /> According to the San Joaquin Soil Survey,the Kingdon sandy loam unit typically consists of fine sandy <br /> loam/sandy loam to 42 inches below ground surface followed by fine sandy loam/course sandy loam <br /> to 61 inches.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 ('n) /cm pH (in/hr) fields <br /> 0-5 Fine sandy loam (SM) <2 5.6- 7.3 2.0-6.0 <br /> 5-14 Fine sandy loam (SM) <2 6.1 - 7.3 2.0-6.0 <br /> Kingdon Sandy loam,fine sandy loam <2 Moderate: <br /> 189 <br /> g 14-28 SM 6.1 - 7.3 2.0-6.0 wetness, <br /> Fine sandy loam (SC-SM, <2 peres slowly <br /> 28 42 CL-ML) 6.1 -7.8 2.0-6.0 <br /> 42-61 Fine sandy loam,sandy loam, <2 6.6 -8.4 2.0-6.0 <br /> course sandy loam SM <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 /> Fine sandy loam and course sandy loam,such as the fine-grained soil layers reported for the Kingdon <br /> soil at the site typically provide a moderate degree of protection between percolating effluent at the <br /> surface and ground water aquifers. Therefore,soils of this type typically present a moderate risk of <br /> excessive mass transport of nitrate or other constituents of concern. <br /> 4 Marchand,D.E.and Bartow,J.A:Open File Report—79-664,1:25,000.Preliminary Geologic Map,Cenozoic Deposits of the Bellota <br /> Quadrangle. <br /> 5 United States Department of Agriculture.Soil Survey of San Joaquin County,California.October 1992. <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 <br /> www.petraIGgix.com <br />