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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 mapped on the Preliminary geologic map of Cenozoic deposits of the Bellota <br /> quadrangle, California (Marchand, D.E., and Bartow, J.A., 1979). It is depicted within a <br /> map unit of the Riverbank formation middle unit, defined as "arkosic alluvium forming <br /> Mokelumne River terraces and alluvial fan; chiefly sand; probably glacial outwash" <br /> (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 San Joaquin loam and San Joaquin loam, thick surface <br /> (Plate 9) (USDA, 2020). The table below presents some selected properties of these <br /> soils.. <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) Class <br /> Reaction ability absorption <br /> Symbol Classification mmhos/cm pH (in/hr) fields <br /> San 0-16 Loam; CL-ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br /> Joaquin 16-26 Clay loam, clay; CL <2 6.1-7.8 <0.06 cemented <br /> loam, 0-2% 26-60 Indurated --- --- --- pan, peres <br /> slopes, slowly <br /> 238 <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 or about August 19, 2020, Live Oak excavated a shallow soil boring by hand auger <br /> near the proposed septic disposal area of the Site for the purpose of conducting a <br /> percolation test; Ms. Delapena's husband broke through the the first two feet of hardpan <br /> in the hole with a jackhammer. The boring was four inches in diameter and 3.32 feet <br /> deep (Table 2). The location of the boring is indicated on Plate 10. <br /> LOGE 20-38 Page 5 <br />