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reasonably be required to remove this contaminant should it occur in drinking water. <br /> The Maximum Contaminant Level Goal (MCLG) for DBCP is zero. <br /> 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 alluvial fan <br /> deposits (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 Capay clay (Plate 9) (USDA, 2020). The table below <br /> 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 /> Capay Clay, 0-20: Clay: CH, CL <2 6.6 - 8.4 0.06 - 0.2 Severe: <br /> 0-2% 20-60: Clay, silty clay: CL, CH <2 6.6 - 8.4 0.06 - 0.2 peres slowly <br /> slopes, 118 <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 October 8, 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, 3.42 feet deep, and was excavated by hand auger (Table <br /> 2). <br /> The location of the boring is indicated on Plate 10. <br /> The soil in the boring was similar to that described by the Soil Survey. Roadbase was <br /> encountered to approximately three inches below ground surface, followed by silty clay <br /> to approximately one foot, followed by silty clay with calcium carbonate inclusions to the <br /> 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 limited 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 20-48 Page 5 <br />