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DBCP is a nematocide and soil fumigant for vegetables and grapes. It is known to <br /> cause male reproductive effects and is classified as a probable human carcinogen. <br /> 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 µg/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 Preliminary geologic map showing Quaternary deposits of <br /> the Lodi quadrangle, California (Marchand and Atwater, 1979). The Site is depicted <br /> within map units of Holocene alluvium and the Riverbank formation upper unit. <br /> Holocene alluvium is described as "channel, levee, and floodplain deposits; chiefly silt <br /> and clay with fine sand along principal drainageways." The Riverbank formation upper <br /> unit is described as "arkosic alluvium forming Mokelumne River alluvial fan; chiefly <br /> sand; probably glacial outwash" (Plate 11). <br /> The surface and near surface soils located at the Site are--sported by the USDA Web <br /> Soil Survey to be composed of Columbia fine sandy loam, Tokay fine sandy loam, and <br /> Tujunga loamy sand (Plate 12) (USDA, 2019). The table below presents some selected <br /> 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 /cm Reaction ability absorption <br /> Symbol (in) Classification mmhos pH (in/hr) fields <br /> Columbia, 0-12: Fine sandy loam; SM, <2 6.1 - 7.8 2.0 -6.0 Moderate: <br /> fine sandy SC-SM flooding, <br /> loam, 12-60: Stratified sand to silt <2 6.1 - 7.8 2.0 -6.0 peres <br /> drained, 0- loam; SM slowly. <br /> 2% slopes, <br /> 130 <br /> Tokay fine 0-19: Fine sandy loam; SM <2 6.1-7.8 2.0-6.0 Slight <br /> sandy loam, 19-45: Fine sandy loam, sandy <2 6.1-7.8 2.0-6.0 <br /> 0-2% loam; SM <br /> slopes, 45-60: Fine sandy loam, sandy <2 6.1-8.4 2.0-6.0 <br /> 256 loam, coarse sandy <br /> loam; SM <br /> LOGE 1912 Page 6 <br />