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24 November 1997 <br /> AGE-NC Project No 97-0312 <br /> Page 3 of 4 <br /> Benzene, sec-butyl benzene, chloroethane, 1,2-dichloroethane, isopropylbenzene and vinyl acetate <br /> were detected in the sample collected from UST-5 at concentrations of 4 4 ppb, 19 ppb,2 3 ppb, 500 <br /> ppb, 14 ppb and 3 6 ppb, respectively Other volatile organic compounds were not detected in the <br />® samples collected Oxygenated compounds were not detected in ground water samples from the site <br /> i The analytical results are summarized on Tables 2 and 3 The laboratory report (MAI sample Nos <br /> 80888 - 80891) and chain-of-custody form are included in Appendix B <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> o During the September 1997 monitoring event the ground water level was NA ithin the <br /> screened interval for the four wells sampled <br /> O Petroleum hydrocarbons were not detected in samples collected from monitoring wells UST- <br /> 2, UST-3 or UST-4 Concentrations of TPH-g and benzene decreased in UST-5, the <br /> concentration of TPH-d increased slightly in UST-5 <br /> • The concentration of benzene in UST-5 was above the State of California drinking water <br /> Maximum Contaminant Level (MCL) during the September 1997 monitoring event <br /> • Five volatile organic compounds were detected in the ground water sample collected from <br /> UST-5 using EPA Method 8260 Drinking water standards have not been established for four <br /> of the detected compounds The concentration of 1,2-dichloroethane was above the MCL of <br /> 0 5 ppb during the September 1997 monitoring event <br /> 5 0. RECOMMENDATIONS <br /> Based upon data obtained during the September 1997 sampling event, AGE recommends the <br /> following <br /> The next quarterly monitoring should be scheduled for December 1997 <br /> Advanced GeoEnvironmental,Inc <br />