Laserfiche WebLink
Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br /> Soil Name Depth Unified Soil Salinity Soil Perme- Septic tank <br /> and Map cm Reaction ability absorption <br /> Symbol (in) Classification mmhos/ pH (in/hr) fields <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 /> San 0-12: Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br /> Joaquin 12-26: Sandy clay loam, SC <2 6.1-7.3 0.2-0.6 cemented <br /> loam, thick 26-35: Clay loam, clay; CL <2 6.1-7.8 <0.06 pan, peres <br /> surface, 0- 35-60: Indurated --- --- --- slowly <br /> 2% slopes <br /> 240. <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 18, 2020, Live Oak excavated a shallow soil boring near the proposed septic <br /> disposal area of the Site for the purpose of conducting a percolation test. The boring <br /> was four inches in diameter, 3.36 feet deep, and was excavated by hand auger. On <br /> May 21, 2020, North American Technical Services excavated a deep boring adjacent to <br /> the shallow; this boring was 25.0 feet deep, six inches in diameter, and excavated with <br /> a truck-mounted hollow-stem auger. <br /> The location of the borings is indicated on Plate 13. <br /> The soil in the borings was similar to that described by the Soil Survey. Sandy silt was <br /> encountered to 2.8 feet below ground surface (bgs), followed by cemented silty sand to <br /> 12 feet bgs, followed by sandy clay to 15 feet bgs, followed by silty fine sand with clay to <br /> 24 feet bgs, followed by fine sand with silt to the full depth of the hole. The soil log is <br /> 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 soil zone but moderate potential in the 25-foot soil zone. <br /> Sandy soils generally have a much greater potential for percolation than fine-grained or <br /> cemented soils. However, a percolation test is the only accepted method for <br /> determining the suitability of the soils for a septic disposal area. Percolation test results <br /> are discussed in the following section. <br /> LOGE 20-20 Page 6 <br />