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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 the Modesto <br />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, 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 <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 />Veritas fine <br />0-15 <br />Fine sandy loam; SM, <br /><4 <br />7.4-8.4 <br />2.0-6.0 <br />Moderate: <br />sandy loam, <br />SC -SM <br />flooding, <br />0-2% slopes, <br />15-54 <br />Sandy loam, fine sandy <br /><4 <br />7.4-8.4 <br />2.0-6.0 <br />cemented <br />266 <br />loam; SM, SC -SM <br />pan <br />54-70 <br />Cemented <br />-- <br />-- <br />-- <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 July 20, 2022, Live Oak excavated a shallow boring near the proposed septic <br />disposal areas for the new houses on the Site for the purpose of conducting a <br />percolation test. The boring was four inches in diameter, 2.36 feet deep, and was <br />excavated by 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 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 2234 Page 5 <br />