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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 Sacramento -San Joaquin Delta, <br />California (Atwater, 1982) as within a map unit of the Modesto formation (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, 2021). 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 Reaction ability absorption <br />Symbol (in) Classification mmhos/cm 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 September 30, 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, 2.61 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. Road base was <br />encountered to 0.5 feet, followed by fine sandy silt to the full depth of the hole. The soil <br />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 2154 Page 5 <br />