Laserfiche WebLink
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 and Bartow, 1979). The Site is depicted <br /> within a map unit of the Modesto formation lower member described as "basin alluvium <br /> from both the Mokelumne and Calaveras Rivers; includes arkosic alluvium, probably <br /> glacial outwash, and locally-derived materials; chiefly fine sand and silt' (Plate 8). <br /> The surface and near surface soils located at the Site are reported by the USDA Web <br /> Soil Survey to be composed of Stockton clay (Plate 9) (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 /> 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 /> Soil Borings <br /> On August 27 and September 8, 2020, Live Oak excavated shallow and deep soil <br /> borings near the proposed septic disposal area of the Site for the purpose of conducting <br /> a percolation test. The borings were four inches in diameter, 3.44 and 8.14 feet deep, <br /> and were excavated by hand auger (Table 2). <br /> The location of the borings is indicated on Plate 10. <br /> LOGE 20-40 Page 5 <br />