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DISCUSSION: <br /> At the time of the first quarter 2003 monitoring event, groundwater was encountered in the monitoring <br /> wells at depths ranging from 50.26 to 50.40 feet below ground surface (bgs). Groundwater elevations <br /> have increased between 1.30 feet and 1.49 feet in the monitoring wells since the December 13, 2002 <br /> monitoring event. Well MW-1 was dry. <br /> TPHG and total lead were detected in all three wells sampled. BTEX compounds and MTBE were <br /> detected in well MW-13 and MW-14. The highest concentration of TPHG (11,000 µg/L), MTBE (2.9 }LglL), <br /> and total lead (0.015 mg/L) were detected in well MW-13. Benzene (26 µg/L) was only detected in well <br /> MW-13, along with TBA(65 �tglL). 1,2-DCA was detected in wells MW-14 (6.4 gg/L) and AS-1 (8.2 µg/L). <br /> At the request of Mr. Harlin Knoll, San Joaquin County Public Health Services, Stratus measured another <br /> well casing found at the site. This well, which has been assigned a designation "VW", is situated adjacent <br /> to the Lube Building and Tank C near where the former soil vapor extraction system has been located <br /> (Figure 2). The well casing has an inside diameter of 4 inches, and the well is 33 feet deep. When <br /> sounded on March 18, 2003, there was no groundwater in the well. <br /> ATTACHMENTS: <br /> o Table 1 Groundwater Elevation and Analytical Summary <br /> • Figure 1 Site Location Map <br /> ® Figure 2 Site Map <br /> • Appendix A Field Data Sheets <br /> o Appendix B Sampling and Analysis Procedures <br /> Appendix C Certified Analytical Reports and Chain-of-Custody Documentation <br /> i <br /> PATeichertlMtockton-1031Quarterly120031T6ehert_1 Q03.DOC 5TRA TU5 <br />