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Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br /> Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm pH (in/hr) fields <br /> San Joaquin 0-16: Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br /> loam, 2-8% 16-26: Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented <br /> slopes, 26-60: Indurated --- --- --- pan, peres <br /> eroded, slowly <br /> 239 <br /> San Joaquin 0-16: Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br /> Complex, 0- 16-26: Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented <br /> 1% slopes, 26-60: Indurated --- --- --- pan, peres <br /> 241 slowly <br /> Note:The table descriptions do not necessarily reflect site-specific soil properties. See description of the map unit for <br /> composition and behavior characteristics of the map unit. <br /> Soil Borings <br /> Live Oak attempted to excavate soil borings on the Site in September 2019, but found <br /> the soil conditions too cemented to allow the use of a hand auger. Consequently, North <br /> American Technical Services of Modesto was contracted to excavate the borings by <br /> drilling rig. <br /> On October 23, 2019, North American Technical Services excavated shallow and deep <br /> soil borings near the existing septic disposal area of the Site (potential future <br /> replacement area) for the purpose of percolation testing. The borings were six inches in <br /> diameter and 3.25 and 24.47 feet deep (Table 2). The locations of the borings are <br /> indicated on Plate 13. <br /> The soil in the boring was similar to that described by the Soil Survey. Sandy clay was <br /> encountered to 1 foot below ground surface, followed by a hardpan of silty sand and <br /> sandy silt to a depth of 7 feet, followed by sandy clay to a depth of 18 feet, followed by <br /> clayey sand to the full depth of the hole. The soil log is presented on Plate 14. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be limited potential for <br /> percolation in the shallow and deep soil zones. Sandy soils generally have a much <br /> greater potential for percolation than fine-grained or cemented soils. However, a <br /> percolation test is the only accepted method for determining the suitability of the soils <br /> for a septic disposal area. Percolation test results are discussed in the following <br /> section. <br /> LOGE 1943 Page 7 <br />