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Mr Nuel Henderson,SJCEHD April 7,2006 <br /> Well Installation Report <br /> ARCO Facility No 5469 <br /> Stockton,California <br /> Page 7 <br /> • Petroleum hydrocarbon and fuel additive concentrations were reported below <br /> laboratory detection limits for each soil sample collected from the unsaturated <br /> zone <br /> • MTBE was detected in the groundwater samples collected from wells MW-11 <br /> (41 µg/L) and MW-13 (0 56 µg/L) <br /> • 1,2-DCA was detected in the groundwater samples collected from wells MW-12 <br /> (0 74 µg/L) and MW-13 (7 4 µg/L) <br /> LIMITATIONS <br /> This report was prepared in general accordance with accepted standards of care that existed <br /> at the time this work was performed No other warranty, expressed or implied, is made <br /> Conclusions and recommendations are based on field observations and data obtained from <br /> this work and previous investigations It should be recognized that definition and <br /> evaluation of geologic conditions is a difficult and inexact art Judgments leading to <br /> conclusions and recommendations are generally made with an incomplete knowledge of the <br /> subsurface conditions present More extensive studies may be performed to reduce <br /> uncertainties This report is solely for the use and information of our client unless otherwise <br /> noted <br /> K IBp-Arco for URS154691ReportslARC05469-wellreport2006 doc STRATU5 <br />