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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 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 Preliminary geologic map of Cenozoic deposits of the <br />Bellota quadrangle, California (Marchand & Bartow, 1979). The Site is depicted within a <br />map unit of the Riverbank formation middle unit, described as "arkosic alluvium forming <br />Mokelumne River terraces and alluvial fan; chiefly sand; probably glacial outwash" <br />(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 loam, with a small area of Bruella sandy <br />loam on its south end (Plate 10) (USDA, 2021). The table below presents some <br />selected properties of these soils: <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 />mmhoslcm <br />Reaction <br />ability <br />absorption <br />S mbol <br />Y <br />--- --- --- slowly <br />240. <br />pH <br />(in/hr) <br />fields <br />Bruella sandy <br />0-8: <br />Sandy loam; SC -SM, <br /><2 <br />6.1 -7.3 <br />2.0-6.0 <br />Severe: <br />loam, hard <br />SM <br />peres slowly <br />substratum, 0- <br />8-42: <br />Sandy loam, sandy <br /><2 <br />6.1 -7.3 <br />0.2 - 0.6 <br />2 % slopes, <br />clay loam; SC <br />112 <br />42-60: <br />Sandy clay loam, <br /><2 <br />6.1 -7.3 <br />0.06-0.2 <br />sandy clay; SC <br />San Joaquin 0-16: Loam; CL -ML, ML <2 5.6-6.5 0.6-2.0 Severe: <br />loam, 0-2% 16-26: Clay loam, clay; CL <2 6.1 -7.8 <0.06 cemented <br />slopes, 26-60: Indurated --- --- --- pan, peres <br />238 slowly <br />San Joaquin <br />0-12: <br />Loam; CL -ML, ML <br /><2 5.6 - 6.5 0.6-2.0 Severe: <br />loam, thick <br />12-26: <br />Sandy clay loam; SC <br /><2 6.1 -7.3 0.2-0.6 cemented <br />surface, 0-2% <br />26-35: <br />Clay loam, clay; CL <br /><2 6.1 -7.8 <0.06 pan, peres <br />slopes <br />35-60: <br />Indurated <br />--- --- --- slowly <br />240. <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 />LOGE 2153 Page 5 <br />