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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 Preliminary geologic map of Cenozoic deposits of the <br />Bellota quadrangle, California (Marchand & Bartow, 1979). The Site is depicted within a <br />map unit of the Riverbank formation middle unit, described 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 Rocklin sandy loam (Plate 9) (USDA, 2022). The table <br />below presents some selected properties of this soil: <br />Table 1. Selected Properties of On -Site Soils (USDA, 1992) <br />Soil Name <br />Depth <br />Unified Soil <br />Salinity <br />Soil <br />Perme- <br />Septic tank <br />and Map <br />(in) <br />Classification <br />mmhos/cm <br />Reaction <br />ability <br />absorption <br />Symbol <br />pH <br />(in/hr) <br />fields <br />Rocklin sandy <br />0-25 <br />Sandy loam; SM <br /><2 <br />5.6-6.5 <br />0.6-2.0 <br />Severe: <br />loam, 2-5% <br />25-36 <br />Loam, sandy clay <br /><2 <br />6.1-7.3 <br />0.6-2.0 <br />cemented <br />slopes, <br />loam, clay loam; SC, <br />pan, peres <br />228 <br />CL <br />slowly <br />36-40 <br />Indurated <br />--- <br />--- <br />--- <br />40-60 <br />Coarse sandy loam, <br /><2 <br />6.1-7.3 <br /><0.06 <br />sandy loam; SM <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 7, 2022, Live Oak excavated a shallow boring in the proposed septic <br />disposal area for the new house on the Site for the purpose of conducting a percolation <br />test. The boring was four inches in diameter, 2.45 feet deep, and was excavated by <br />hand auger (Table 2). 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. Sandy silt was <br />encountered 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 some 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 />LOGE 2210 Page 5 <br />