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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 pg/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 /> The laboratory analytical results are attached as Appendix 5 of this report. <br /> Soil Profile and Geologic Information <br /> The Site is mapped on the Geologic Map of California: San Jose sheet (Rodgers, 1966). <br /> It is depicted within a map unit of Great Valley basin deposits (Plate 8). <br /> The surface and near surface soils located at the Site are reported by the Web Soil <br /> Survey (USDA, 2015) to be composed of Hollenbeck silty clay, Jacktone clay, and <br /> Stockton clay (Plate 9). The table below presents some selected properties of these <br /> 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 mmhos/cm Reaction ability absorption <br /> Symbol pH (in/hr) fields <br /> Hollenbeck 0-10 Silty clay; Severe: <br /> CH, CL <2 6.6-8.4 0.06-0.2 <br /> silty clay, 0- 10-37 Clay, silty cla • CH CL <2 6.6-8.4 0.06-02 peres slowly <br /> 2% slopes, 37-42 Silty clay loam, clay <2 6.6-8.4 0.2-0.6 <br /> 173 loam; CL <br /> 42-60 Cemented --- --- --- <br /> ]acktone 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-ML, <2 7.9-9.0 0.2-0.6 <br /> CL <br /> 46-60 Cemented --- --- --- <br /> Stockton 0-29: Clay; CL, CH <2 7.4-8.4 0.14-0.16 Severe: <br /> clay, 0-2% 29-37: Clay, silty clay; CL, CH <2 7.4-8.4 0.14-0.16 peres slowly <br /> slopes, 250 37-42: Clay loam, silty clay <2 7.4-8.4 0.14-0.17 <br /> loam; CL <br /> 42-60: 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 1513 Page 5 <br />