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the MCL at 0.2 parts per billion (ppb, equivalent to pg/L) because it believes that given <br />present technology and resources, this is the lowest level to which water systems can <br />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 Joaquin Delta, <br />California (Atwater, 1982). The Site is depicted within a map unit of undivided alluvial- <br />floodplain deposits (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 Grangeville fine sandy loam and Merritt silty clay loam <br />(Plate 10) (USDA, 2021). The table below presents some selected properties of these <br />soils: <br />Table 1. Selected Properties of On-Site Soils (USDA, 1992) <br />Depth <br />(in) <br />Unified Soil <br />Classification <br />Salinity <br />mmhos/cm <br />Soil <br />Reaction <br />pH <br />Perme- <br />ability <br />(in/hr) <br />Septic tank <br />absorption <br />fields <br />0-20 <br />20-60 <br />Fine sandy loam; SM <br />Stratified loamy sand to <br />silt loam; SM <br /><2 <br /><2 <br />6.6-7.8 <br />6.6-8.4 <br />2.0-6.0 <br />2.0-6.0 <br />Moderate: <br />flooding, <br />wetness <br />0-17 <br />17-49 <br />19-60 <br />Silty clay loam; CL <br />Silt loam, silty clay <br />loam; CL <br />Stratified loamy fine <br />sand to silt loam; SM, <br />ML <br /><2 <br /><2 <br /><2 <br />6.6-8.4 <br />7.9-8.4 <br />7.9-8.4 <br />0.2-0.6 <br />0.2-0.6 <br />0.6-2.0 <br />Severe: <br />percs slowly <br />Soil Name <br />and Map <br />Symbol <br />Grangeville <br />fine sandy <br />loam, partially <br />drained, 0-2% <br />slopes, 166 <br />Merritt silty <br />clay loam, <br />partially <br />drained, 0-2 % <br />slopes, 197 <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 May 26, 2021, Live Oak excavated a shallow soil boring on each proposed parcel of <br />the Site for the purpose of conducting percolation tests. The borings were four inches in <br />diameter, 3.47 and 2.52 feet deep, and were excavated by hand auger (Table 2). <br />The locations of the borings are indicated on Plate 11. <br />The soil in the borings was similar to that described by the Soil Survey. On the <br />homesite parcel (location PA), sandy clay was encountered to the full depth of the hole. <br />LOGE 2121 Page 5