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01 May 2002 _ <br /> AGE-NC Project No 98-0540 <br /> Page 3 of 4 <br /> concentration of 6 1 µg/1 and total xylenes were detected in the samples from MW-1 and MW-3 at <br /> concentrations of 76 µg/1 and 18 µg/1,respectively 1,2-DCA was detected in the samples collected <br /> from MW-1 and MW-2 at concentrations of 34 µg/1 and 40 µg/l,respectively Other target analytes <br /> Iwere not detected above laboratory reporting limits (Table 2) <br /> No target analytes were detected above laboratory reporting limits in the ground water sample <br /> collected from the domestic well on site <br /> Analytical results of ground water samples are summarized on Table 2 Copies of the laboratory <br /> report (CTEL Laboratory IDs 0204-010-1 through 0204-010-4) and chain-of-custody forms are in <br /> Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • The maximum ground water gradient was 0 001 ft/ft with a flow direction toward the south- <br /> southeast, and was consistent with the gradient and flow direction from the last monitoring <br /> event <br />' • TPH-g and BTEX compounds were detected in ground water samples collected from MW-1 <br /> and MW-3 The benzene concentration detected in the samples collected from MW-1 and <br /> MW-3 exceeded the State of California's Maximum Contaminant Level (MCL) of 1 µg/1 <br /> • MTBE and other oxygenated fuel additives were not detected above laboratory reporting <br /> limits in any of the ground water samples <br /> I • 1,2-DCA was detected in the ground water samples collected from MW-1 and MW-3 The <br /> detected concentrations exceeded the MCL of 0 5 µg/1 <br /> • The highest concentrations of dissolved petroleum hydrocarbons are in the area of the former <br /> UST (MW-1) and down-gradient (MW-3) <br /> • The lateral extent of dissolved petroleum hydrocarbon-impacted ground water has not been <br /> fully delineated <br /> IAdvanced GeoEnvironmental,Inc <br />