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Augu'st 1,2002 <br /> Job Number:"LG02-183 <br /> 'Page 5 <br /> DBCP is a nematocide and soil fumi antfor vegetables, and ra es. It is thought tocause " <br /> , , <br /> health problems consisting of kidney damage, liver damage, and cancer. The use of DBCP was <br /> discontinued in;1979. <br /> VI. GEOLOGY, SOILS,AND PERCOLATION TEST <br /> The surficial.,geology of the site is reported to be the Pleistocene age (11,000 years to <br /> about 2 mill on.years old) Riverbank Formation. This-formation is described-as weathered <br /> reddish gravel; sand and.silt often.forming alluvial terraces and fans.4 The Riverbank in the:San <br /> Joaquin Valley is.predominately arkosic alluvium While the Sacramento Valley contains more <br /> mafic igneous rock fzagments5 (Plate 6). Essentially,these formations.are consolidated older <br /> alluvium., <br />' The surface and near i <br /> surface soils located on the are re orte" - <br /> 4 reported to be the Bruella sandy . <br /> loam; BrueIla sandy loam with hard substratum, and the San-Joaquin loam (Plate 7).. Table 3. <br /> presents an excerpt of some selected engineering properties"for soils located on the subject <br /> - property.; <br /> h <br /> a4 a Wagner,D L. and others, 1987. Geologic Map of the Sacramento Quadrangle. California Division of <br /> Mines and Geology Regional Geologic Map Series,.Map No. IA'. "Scale 1:250,000; <br /> 5 He11ey, E.J. and Harwood,,D.S., 1985: Geologic map ofthe Cenozoic Deposits of the Sacramento Valley <br /> 3 and Sierran Foothills, California. U,S:Geologic Survey Miscellaneous Field Studies Map,MF-1790. <br />+ 6 USDA Soil Conservation Service, 1992, Soil Survey of San Joaquin County,California, Sheet"7. <br /> r ti <br />