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June 8,2001 <br /> Job Number:LG01-141 <br /> Page 4 <br /> Table 2. <br /> Summary of Available Ground Water Information. <br /> Date,Description,Source Groundwater Depth Notes <br /> February 1,2001,one 2.5-foot,on-site soil No ground water <br /> boring,Neil O.Anderson&Associates, encountered to a total <br /> Inc. depth of 2.5 feet. <br /> Fall 1998, San Joaquin County Ground About 24 feet in depth. Ground water gradient is 5 ft per <br /> Water Map.Plates 2 and 4. mile and flow direction north. <br /> Spring 1999,San Joaquin County Ground About 19 feet in depth. Ground water gradient is 6.25 ft per <br /> Water Map.Plates 3 and 5. mile and flow direction north. <br /> _ No ground water wells are located on the property or near by the property. We <br /> understand from Dave Silva that the area east of Interstate 5 is served by a public water supply. <br /> Due to the absence of an onsite water well and the owner's intent to continue to use the land for <br /> truck storage,no ground-water sample was tested for DBCP and Nitrate. <br /> VI. GEOLOGY,SOILS,AND PERCOLATION TEST <br /> The surficial geology of the site is reported to be the Pleistocene age (10,000 years to <br /> about 1.8 million years old) Modesto Formation! The Modesto Formation is generally <br /> comprised of old alluvium that forms distinct alluvial terraces, some alluvial fans, and channel <br /> ridges. Atwater's map shows a light stipple pattern at the site indicating loose sand and silt <br /> whose origin is chiefly fluvial (Plate 6). <br /> The soil located on the site is reported to be the Veritas fine sandy loam (Plate 7). The <br /> Soil Survey of San Joaquin County describes the Veritas fine sandy loam as "a moderately well <br /> drained, nearly level soil that forms on low terraces. It is deep to a hardpan. It formed in <br /> alluvium derived from mixed rock sources. Permeability is moderately rapid in the Veritas <br /> soil. "3 Table 3 presents an excerpt of some selected engineering properties for the soil located <br /> on the subject property. <br /> z Atwater B.F., 1982. Geologic maps of the Sacramento-San Joaquin Delta,California. U.S.Geologic <br /> Survey Miscellaneous Field Studies Map,MF-1401,sheet 17,scale 1:24,000. <br /> 3 USDA Soil Conservation Service, 1992,Soil Survey of San Joaquin County,California, Sheet 7. <br /> 4 <br />