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color of the skin, as well as headache, dizziness, weakness, and difficulty breathing. <br /> Ingestion of high levels of nitrates over time can also lead to gastric problems. <br /> 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 showing Quaternary deposits of <br /> the Lodi Quadrangle, California (Marchand and Atwater, 1979). The Site is depicted <br /> within a map unit of the Modesto formation lower member described as "Qmt (arkosic <br /> alluvium forming Mokelumne River alluvial fan) and Qmjb deposits (basin alluvium <br /> derived from Mokelumne and Calaveras Rivers; includes arkosic alluvium, probably <br /> glacial outwash, and locally-derived materials; chiefly fine sand and silt) overlain by 0.5 <br /> to 1.5 m of Qm2b deposits (foothill-derived basin and interdistributary overbank <br /> alluvium) (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 Jacktone clay (Plate 11) (USDA, 2020). The table below <br /> presents some selected properties of this soil: <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 Reaction ability absorption <br /> Symbol (in) Classification mmhos/cm pH (in/hr) fields <br /> Jacktone 0-22 Clay; CL, CH <2 6.6-8.4 0.06-0.2 Severe: <br /> clay, 0-2% 22-34 Clay loam, clay, silty <2 7.9-9.0 0.06-0.2 cemented <br /> slopes, clay, CL, CH pan, peres <br /> 180 34-37 Indurated --- --- --- slowly <br /> 37-46 Loam, clay loam; CL- <2 7.9-9.0 0.2-0.6 <br /> ML, CL <br /> 46-60 Cemented --- --- --- <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 20-03 Page 5 <br />