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Soil Profile and Geologic Information <br /> The Site is depicted on the Geologic map of the Sacramento-San Joaquin Delta, <br /> California (Atwater, 1982) as within a map unit of the Modesto formation consisting of <br /> loose sand and silt (Plate 8). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Veritas fine sandy loam (Plate 9) (USDA, 2020). The <br /> table below presents some selected properties of this soil: <br /> 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 <br /> Reaction ability absorption <br /> Symbol <br /> pH (in/hr) fields <br /> Veritas fine 0-15 Fine sandy loam; SM, <4 7.4-8.4 2.0-6.0 Moderate: <br /> sandy loam, SC-SM flooding, <br /> 0-2% 15-54 Sandy loam, fine sandy <4 7.4-8.4 2.0-6.0 cemented <br /> slopes, loam; SM, SC-SM pan <br /> 266 54-70 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 February 10, 2021, Live Oak excavated a shallow soil boring near the proposed <br /> septic disposal area of the Site for the purpose of percolation testing. The boring was <br /> four inches in diameter, 3.17 feet deep, and was excavated by hand auger. The location <br /> of the boring is indicated on Plate 10. <br /> The soil in the boring was similar to that described by the Soil Survey. Sandy silt was <br /> encountered to approximately 2.5 feet below ground surface, followed by silty very fine <br /> sand to the full depth of the hole. The soil log is presented on Plate 11. <br /> Discussion of Soil Lithology <br /> Based on the soil observed in the boring, there appears to be good potential for <br /> percolation in the shallow soil zone. Sandy soils generally have a much greater <br /> potential for percolation than fine-grained or cemented soils. However, a percolation <br /> test is the only accepted method for determining the suitability of the soils for a septic <br /> disposal area. Percolation test results are discussed in the following section. <br /> LOGE 2109 Page 5 <br />