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Most domestic use of DBCP was discontinued in 1977 through 1979. The US EPA set <br /> the MCL at 0.2 parts per billion (ppb, equivalent to ug/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 Holocene alluvial- <br /> floodplain deposits (Plate 10). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Merritt silty clay loam and Grangeville clay loam (Plate <br /> 11) (USDA, 2020). The table below presents some selected properties of these soils: <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 (in) Classification <br /> Reaction ability absorption <br /> Symbol mmhos/cm pH (in/hr) fields <br /> Grangeville 0-16 Clay Loam; CL <2 6.6-7.8 0.2-0.6 Moderate: <br /> clay loam, 16-32 Sandy loam, fine sandy flooding, <br /> partially loam, loam; SM, ML <2 6.6-8.4 2.0-6.0 wetness <br /> drained, 0- 32-60 Stratified loamy sand to <br /> 2% slopes, silt loam; SM <2 6.6-8.4 2.0-6.0 <br /> 167 <br /> Merritt silty 0-17 Silty clay loam; CL <2 6.6-8.4 0.2-0.6 Severe: <br /> clay loam, 17-49 Silt loam, silty clay loam; peres slowly <br /> partially CL <2 7.9-8.4 0.2-0.6 <br /> drained, 0-2 19-60 Stratified loamy fine <br /> % slopes, sand to silt loam; SM, <br /> 197 ML <2 7.9-8.4 0.6-2.0 <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 April 27, 2020, Live Oak excavated a shallow soil boring near the existing septic <br /> system on the Site for the purpose of conducting a percolation test. The boring was <br /> four inches in diameter, 3.08 feet deep, and was excavated by hand auger (Table 2). <br /> The location of the boring is indicated on Plate 12. <br /> The soil in the boring was similar to that described by the Soil Survey. Silty clay was <br /> encountered to 1.5 feet below ground surface, followed by sandy silt with clay to 3.0 <br /> LOGE 20-17 Page 5 <br />