Laserfiche WebLink
Soil Profile and Geologic Information <br /> The Site is depicted on the Geologic map of the San Francisco-San Jose quadrangle, <br /> California (Wagner, et al., 1991). The Site is depicted within a map unit of Dos Palos <br /> alluvium (Plate 11). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Manteca fine sandy loam and Trahern clay loam (Plate <br /> 12) (USDA, 2019). The 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 /cm Reaction ability absorption <br /> Symbol (in) Classification mmhos pH (in/hr) fields <br /> Manteca 0-11 Fine sandy loam; SM <2 7.4-8.4 2.0-6.0 Severe: <br /> fine sandy 11-24 Fine sandy loam, loam, <2 7.4-8.4 0.6-2.0 cemented <br /> loam, 0-2% sandy loam; SM, SC-SM pan <br /> slopes, 196 24-35 Indurated <2 --- --- <br /> 35-54 Cemented <2 --- --- <br /> 54-74 Stratified loamy sand to <2 7.4-8.4 2.0-6.0 <br /> loam; SM <br /> Trahern 0-14 Clay loam; CL <4 7.4-8.4 0.2-0.6 Severe: <br /> clay loam, 14-28 Clay; CH, CL 4-8 8.5-9.0 <0.06 cemented <br /> partially 28-38 Clay loam, silty clay <4 7.9-9.0 0.2-0.6 pan, peres <br /> drained, 0- loam; CL slowly <br /> 2% slopes, 38-60 Cemented --- --- --- <br /> 258 <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 April 29, 2019, 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, 3.1 feet deep, and was excavated by hand auger (Table 2). <br /> The location of the boring is indicated on Plate 13. <br /> The soil in the boring was similar to that described by the Soil Survey. Clayey sand was <br /> encountered to 1.7 feet below ground surface, followed by cemented silty sand to the <br /> 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 some potential for <br /> percolation in the shallow soil zone. Sandy soils generally have a much greater <br /> LOGE 1914 Page 4 <br />