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1246 N Fine Road Project No. 2021-00025 Page 13 <br />The surface and near surface soils located at the site are reported by the San Joaquin County Soil <br />Survey5 to be composed of the San-Joaquin sandy loam, 0-2 percent slopes (Plate 5, Appendix A). <br />According to the USDA Natural Resources Conservation Service's Web Soil Survey, the San-Joaquin <br />sandy loam unit typically consists of alternating layers of sandy loam to and clay up to 20 inches <br />below ground surface followed by cemented conditions to from 20 to 60 inches. The table below <br />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 />San-Joaquin <br />236 <br />0-13 <br />13-20 <br />20-60 <br />Sandy loam; SM <br />Clay loam, clay; CL <br />Indurated <br /><2 <br /><2 <br />--- <br />5.6-6.5 <br />6.1-7.8 <br />--- <br />0.6-2.0 <br /><0.06 <br />--- <br />Sever: <br />cemented <br />pan, percs <br />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 />A geologic well log (Well Completion Report No. WP0038808) 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 indicates there are alternating layers of clay, sand, gravel, and shale <br />down to 300 feet. In addition, the Soil Survey of San Joaquin states "if the unit is used for homesite <br />development, the main limitations are depth to the very slowly permeable claypan and hardpan" with <br />increasing the size of the absorption filed, backfilling the trench with sandy material, and installing <br />long absorption lines recommended to overcome slow permeability. The well completion report is <br />included in Appendix B. <br />32 Mass Transport Soil Properties <br />The sandy loam, clay, and indurated soil such as the layers reported for the San Joaquin soil at the <br />site typically provide a moderate to high degree of protection between percolating effluent at the <br />surface and ground water aquifers. Therefore, soils of this type typically present a low to moderate <br />risk of excessive mass transport of nitrate or other constituents of concern. <br />5 United States Department of Agriculture. Soil Survey of San Joaquin County, California. October 1992. <br />Petraloglx Engineering, Inc. <br />26675 &wile Road, Galt, Ca 95632 <br />(209)400-5729 <br />www.petralogix.com <br />•