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26440,8875,&8925 Thornton Road Project No.2017-00010 Page 13 <br /> The surface and near surface soils located at the site are reported by the San Joaquin County <br /> Soil Survey6 to be composed of the Sailboat silt loam, drained, 0-2% slopes (Plate 4, <br /> Appendix 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 /> 0-8: Silt loam; CL-ML, ML <2 6.1 - 7.3 0.6 - 2.0 <br /> Sailboat silt 8-23: Stratified sandy loam to silty <2 6.6- 7.4 0.2 - 0.6 <br /> percs <br /> loam, clay loam; CL-ML,CL Severe:slowly. <br /> 234 <br /> 23-61: Stratified sandy clay loam to <2 7.4-8.4 0.2 -0.6 <br /> silty clay loam; CL <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. <br /> 2.2 Mass Transport Soil Properties <br /> Layered soils and sediments, such as the stratified sandy loam and clay loam soil layers <br /> reported for the Sailboat silt loam at the site typically provide a degree of protection between <br /> percolating effluent at the surface and ground water aquifers. Soils of this type do not <br /> typically present a high risk of excessive mass transport of nitrate or other constituents of <br /> concern. <br /> 3.0 GROUNDWATER ANALYSIS <br /> 3.1 Regional and Site-Specific Groundwater <br /> The San Joaquin County Flood Control and Water Conservation District (Fall and Spring, <br /> 2016) groundwater reports were initially reviewed to determine the groundwater levels <br /> near the site, however, the site location does not fall within the groundwater elevation map <br /> contours (Appendix A, Plate 5). Therefore, the California Department of Water Resources <br /> (DWR)Water Data Library7 was reviewed online.According to the Water Data Library,there <br /> are two wells located near the Site. Well ID 382269N1214285W00, with use labeled as <br /> "unknown", located at the 26485 N.Thornton Road, (located across the street west from the <br /> site's parcel with address 26440 N. Thornton Road), has groundwater reported in October <br /> and March for each year from October 1988 to October 1993,with the depth to groundwater <br /> varying from 7 feet below ground surface (bgs) to 13 feet bgs, or -1.06 feet mean seal level <br /> 6 United States Department of Agriculture.Soil Survey of San Joaquin County,California.October 1992. <br /> 7 http://www.water.ca.gov/waterdatatibrary/Accessed November 18, 2017. <br /> Petralogix Engineering,Inc. <br /> 26675 Brueila Road,Gait Ca 95632 <br /> (209)-406-5729 'I <br /> www.petralogix.com <br />