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♦1 <br /> t <br /> (yt <br /> 45 E Harding Way, Stockton, California June 17, 1994 <br /> Chevron USA Products Company Page 6 <br /> 4.0 RESULTS OF ADDITIONAL ASSESSMENT <br /> 41 Hydrogeology <br /> The site is located in the northern part of the San Joaquin Valley at an elevation of approximately 12 feet <br /> above sea level The valley fill consists of late Mesozoic through Eocene marine sedimentary rocks <br /> overlain by late Tertiary and Quaternary non-marine deposits which usually contain fresh water In the <br /> Stockton area, late Cenozoic deposits are approximately 3,000 feet thick and generally consist of alluvial <br /> gravel, sand, silt, and clay Groundwater in these alluvial deposits is unconfined to sem�confined <br /> The materials logged to a depth of 50 feet during drilling at the site are interbedded clayey salts and silty <br /> clays with lenses of sand Groundwater was encountered during drilling at a depth of approximately 47 <br /> feet BGS In SB-6 <br /> 4.2 Results of Soil Sample Analyses <br /> Results of all sal sample analyses are summarized In Table 1 No benzene or TPH-G was detected in <br /> any of the analyzed soil samples Copies of the laboratory analyses reports and chain-of-custody <br /> mandests are included in Appendix C <br /> GROUNDWATER <br /> 4527AAR RPT �I TECIiNoLoccy <br />