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12172 N Hibbard Road Project No.2021-00063 Page 13 <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 Galt clay, and Stockton clay, 0-2 percent slopes (Plate 5,Appendix <br /> 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 (in) /cm pH (in/hr) fields <br /> Severe: <br /> 0-25: Clay; CL, CH <2 6.6 - 7.3 0.06 - 0.2 cemented <br /> Galt clay, 160 25-34: Clay, Silty clay; CL, CH <2 6.6 -8.4 0.06 - 0.2 pan,peres <br /> 34-60 Cemented,--- --- --- --- slowly. <br /> 0-29: Clay; CL, CH <2 7.4-8.4 0.06 - 0.2 Severe: <br /> Stockton clay 29-37: Clay, Silty clay; CL, CH <2 7.4-8.4 0.06 - 0.2 peres <br /> 250 37-42 Clay; CL, CH <2 7.4-8.4 0.06 - 0.2 slowly. <br /> 42-60 Cemented,--- --- --- --- <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 soil such as the layers reported for the San Joaquin soil at the site typically <br /> provide a high degree of protection between percolating effluent at the surface and ground water <br /> aquifers. Therefore, soils of this type typically present a low risk of excessive mass transport of <br /> nitrate or other constituents of concern. <br /> 4.0 GROUNDWATER INFORMATION <br /> 4.1 Groundwater Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (2017 and 2018) <br /> groundwater reports were reviewed to determine the groundwater levels near the Site. The Fall <br /> 2017 and Spring 2018 maps are the most current official maps available from the County. According <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 />