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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 maps of the Sacramento -San Joaqin Delta, <br />California (Atwater, 1982). The Site is depicted within a map unit of the Modesto <br />formation, described as "loose sand and silt, chiefly fluvial" (Plate 9). <br />The surface and near surface soils located at the Site are reported by the USDA Web <br />Soil Survey to be composed of the Honcut sandy loam (Plate 10) (USDA, 2022). 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 and <br />Depth <br />Unified Soil <br />Salinity <br />Soil <br />Perme <br />Septic tank <br />Map Symbol <br />(in) <br />Classification <br />mmhos/cm <br />Reaction <br />-ability <br />absorption <br />pH <br />(in/hr) <br />fields <br />Honcut sandy <br />0-21 <br />Sandy loam; SM <br /><2 <br />6.1-7.3 <br />2.0-6.0 <br />Slight <br />loam, 0-2% <br />21-60 <br />Coarse sandy loam <br /><2 <br />6.1-7.8 <br />2.0-6.0 <br />slopes, <br />sandy loam, SM <br />175 <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 August 1, 2022, Live Oak excavated a shallow soil boring in the proposed septic <br />disposal area of the new house on the Site for the purpose of conducting a percolation <br />test. The boring was four inches in diameter, 2.01 feet deep, and was excavated by <br />hand auger (Table 2). The location of the boring is indicated on Plate 11. <br />The soil in the boring was similar to that described by the Soil Survey. Silty, very fine <br />sand was encountered to the full depth of the hole. The soil log is presented on Plate <br />12. <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 2237 Page 5 <br />