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Weil InstaIlation Report August 17,2001 <br /> ARCO Facility No. 5469 <br /> Stockton,California <br /> • Page 6 <br /> • Benzene and MTBE were detected in groundwater samples collected from monitoring <br /> wells MW-8 and MW-10. Benzene concentrations decrease with depth from 2,300 µg11 <br /> (MW-8) to 51 µg11 (MW-10). MTBE concentrations decrease with depth from 1,600 µg11 <br /> (MW-8) to 260 µg/1 (MW-10). <br /> Limitations <br /> This report was prepared in general accordance with accepted standards of care which existed at <br /> 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 form this <br /> work and previous investigations. It should be recognized that definition and evaluation of <br /> geologic conditions is a difficult and inexact art. Judgments leading to conclusions and <br /> recommendations are generally made with incomplete knowledge of the subsurface conditions <br /> present. More extensive studies may be performed to reduce uncertainties. This report is solely <br /> for the use of our client unless otherwise noted. <br /> If you have any questions concerning this report, please contact Jay Johnson at (530) 676-6000. <br /> • <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANT4a . <br /> Scott Bittinger n R.G. <br /> Staff Geologist ger <br /> • <br /> C:\ARCO154691REPORTS\5469We11 Installation 0601 Am <br />