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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 Preliminary geologic map showing Quaternary deposits of <br />the Lodi quadrangle, California (Marchand and Atwater, 1979). The Site is depicted <br />within a map unit of the Riverbank formation middle unit, described as "arkosic alluvium <br />forming Mokelumne River terraces and alluvial fan; chiefly sand; probably glacial <br />outwash" (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 San Joaquin -Urban land complex (Plate 10) (USDA, <br />2021). The table below presents some selected properties of this soil: <br />Table 1. Selected Properties of On -Site Soils (USDA, 1992) <br />Soil Name and Depth <br />Unified Soil <br />Salinity <br />Soil <br />Perme- <br />Septic tank <br />Map Symbol (in) <br />Classification <br />mmhos/cm <br />Reaction <br />ability <br />absorption <br />pH <br />(in/hr) <br />fields <br />San Joaquin- 0-16 <br />Loam; CL -ML, ML <br /><2 <br />5.6-6.5 <br />0.6-2.0 <br />Severe: <br />Urban 16-26 <br />Clay loam, clay, CL <br /><2 <br />6.1-7.8 <br /><0.06 <br />cemented <br />Complex, 0-2% 26-60 <br />Indurated <br />--- <br />--- <br />--- <br />pan, peres <br />slopes, 242 <br />slowly <br />Note: The table descriptions do not necessarily reflect site-specific soil properties. See description <br />of the map unit for <br />composition and behavior characteristics of the map unit. <br />Soil Borings <br />On September 27, 2021, Mr. Marsili and Live Oak excavated a shallow soil boring on <br />Parcel 1 of the Site for the purpose of conducting a percolation test. The boring was <br />four inches in diameter, 2.84 feet deep, and was excavated by hand auger (Table 2). <br />Based on initial percolation rates observed in the shallow boring, Central Valley Septic <br />was retained to drill a second boring to a depth of 18.89 feet on October 21, 2021; this <br />boring was 12 inches in diameter and was completed with a Spiradrill LHD 50. <br />In addition to these borings, two borings were previously excavated on Parcel 2 of the <br />Site (then Parcel 4 of a four -parcel minor subdivision) in 2003. Those borings were 4 to <br />6 inches in diameter, 40 to 136 inches in depth (3.3 to 11.3 feet), and were drilled under <br />the supervision of Earnest Smith. <br />The locations of the borings are indicated on Plate 11. <br />The soils in the borings were similar to those described by the Soil Survey. In the <br />borings advanced by Live Oak and Central Valley, sandy silt was encountered to 1.5 <br />LOGE 2150 Page 5 <br />