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5431 Grant Line Road, Banta, California August 2, 1994 <br /> • Chevron USA Products Company Page 5 <br /> 4.0 RESULTS OF ADDITIONAL ASSESSMENT <br /> 41 Hydrogeology <br /> The site Is located in the northwestern part of the San Joaquin Valley at an elevation of approximately 22 <br /> feet The valley fill consists of late Mesozoic through Eocene dominantly marine deposits overlain by <br /> late Tertiary and Quaternary dominantly non-marine sediments which usually contain fresh water The <br /> late Cenozoic deposits generally consist of alluvial gravel, sand, silt, and clay Groundwater In these <br /> alluvial deposits is unconfined to semiconfined Pilo-Pleistocene lacustrine deposits, Including the <br /> extensive diatomaceous Corcoran Clay, occur in San Joaquin Valley southeast of Banta The water <br /> beneath the clay bed Is usually confined <br /> Sod, to a depth of 15 feet beneath the site, consists of clayey silt and silty clay with lenses of sand <br /> Groundwater was encountered during drilling at a depth of approximately 15 feet BGS in clay <br /> 4.2 Results of Soil Sample Analyses <br /> Table 1 summarizes the laboratory analytical results of sod samples collected June 21, 1994 Of the six <br /> analyzed sod samples only one, the 10-feet-BGS MW-2 sample, contained some components of <br /> gasoline-range hydrocarbons at levels near MDL Benzene was not detected Copies of laboratory <br /> analyses reports and chain-of-custody manifests for the sod samples collected June 21, 1994 are <br /> included in Appendix D <br /> 0014EAR RPT(Chv-4\GRANTUN) EE <br /> ❑ GROUNDWATER <br /> TECHNOLOGY . <br />