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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 (in) Classification mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Archerdale 0-8: Clay loam, CL <2 6.6 - 7.3 0.2 - 0.6 Severe: <br /> clay loam, 8-35: Clay loam, clay, silty <2 6.6 - 7.3 0.06 - 0.2 peres slowly <br /> 0-2% clay loam, CL, CH <br /> slopes, 107 35-60: Clay loam, clay, silty <2 6.6 - 7.3 0.06- 0.2 <br /> clay loam; CL, CH <br /> Hollenbeck 0-10: Silty clay; CH, CL <2 6.6-8.4 0.06-0.2 Severe: <br /> silty clay, 0- 10-37: Clay, silty clay; CH, CL <2 6.6-8.4 0.06-02 peres slowly <br /> 2% slopes, 37-42: Silty clay loam, clay <2 6.6-8.4 0.2-0.6 <br /> 173 loam; CL <br /> 42-60: Cemented --- --- --- <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 /> On May 3 and 14, 2018, Live Oak excavated shallow soil borings on the proposed new <br /> parcels of the Site for the purpose of conducting percolation tests. The borings were <br /> four inches in diameter, 3.0, 3.05, and 3.25 feet deep, and were excavated by hand <br /> • auger (Table 2). The locations of the borings are indicated on Plate 9. <br /> The soil in the borings was similar to that described by the Soil Survey. Fat clay was <br /> encountered to a depth of 12 or 16 inches, followed by sandy clay to the full depth of <br /> each hole. The soil logs are presented on Plates 10 and 11. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, it appears that there is limited potential for <br /> percolation in the shallow soil zones at the test locations. Sandy soils generally have a <br /> much 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 /> Percolation Test <br /> Shallow percolation tests were conducted on the proposed new parcels of the Site. The <br /> soil borings discussed above were used for the percolation test holes (Plates 10 and <br /> 11). Percolation test procedures conformed to San Joaquin County Environmental <br /> Health Department policy. <br /> • <br /> LOGE 1826 Page 6 <br />