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11655 S UNION ROAD Project No. 2020-00095 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 Veritas fine sandy loam, 0-2 percent slopes (Plate 5, Appendix A). <br />According to the USDA Natural Resources Conservation Service's Web Soil Survey, the Veritas sandy <br />loam unit typically consists of fine sandy loam to 54 inches below ground surface followed by <br />cemented conditions to 70 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 <br />and Map <br />Symbol <br />Depth <br />(in) Unified Soil Classification <br />Salinity <br />mmhos <br />/cm <br />Soil <br />Reaction <br />pH <br />Perme- <br />ability <br />(in/hr) <br />Septic tank <br />absorption <br />fields <br />Veritas fine <br />sandy loam, <br />266 <br />0-15 <br />15-54 <br />54-70 <br />Fine sandy loam; SM, SC-SM <br />Sandy loam, fine sandy loam; <br />SM, SC-SM <br />--- <br /><4 <br /><4 <br />--- <br />7.4-8.4 <br />7.4-8.4 <br />--- <br />2.0-6.0 <br />2.0-6.0 <br />--- <br />Moderate: <br />flooding, <br />cemented pan <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 />A geologic well log (Well Completion Report No. WP0037172) for a site located at 15127 French <br />Camp Road, which the soil map indicates is within the Veritas fine sandy loam reported hardpan from <br />4 to 6 feet below ground surface. In addition, the Soil Survey of San Joaquin states "if the unit is used <br />for homesite development, the main limitation is depth to the hardpan" with ripping of hardpan <br />recommended if encountered at the depth required for leach fields. The well completion report is <br />included in Appendix C. <br /> <br />3.2 Mass Transport Soil Properties <br />Fine sandy loam and sandy loam, such as the fine-grained soil layers reported for the Veritas soil at <br />the site typically provide a moderate degree of protection between percolating effluent at the surface <br />and ground water aquifers. Therefore, soils of this type typically present a moderate risk of excessive <br />mass transport of nitrate or other constituents of concern. <br /> <br />4.0 GROUNDWATER INFORMATION <br /> <br />4.1 Groundwater Depth and Gradient <br />The San Joaquin County Flood Control and Water Conservation District (2016) groundwater reports <br />were reviewed to determine the groundwater levels near the Site. The Fall 2016 and Spring 2016 <br />5 United States Department of Agriculture. Soil Survey of San Joaquin County, California. October 1992. <br />Petralogix Engineering, Inc. <br />26675 Bruella Road, Gait, Ca 95632 <br />(209)-400-5729 <br />www.petralogix.com <br />1