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' 08 October 2002 <br /> • AGE-NC Project No. 98-0468 <br /> ' Page 5 of 6 <br /> Target analytes were not detected in ground water samples collected from monitoring wells MW-9 <br /> '. and MW-10 during the initial monitoring event of 04 April 2002. <br /> Laboratory results of ground water samples analyzed for petroleum hydrocarbons and fuel additives <br /> are summarized in Table 2. The laboratory reports (MAI Laboratory ID: 90612, 91036, 91037 and <br /> 0204087-01102), quality assurance and quality control (QA/QC) reports and chains-of-custody are <br /> ' included in Appendix C. <br /> ' 4.0. SUMMARYICONCLUSIONS <br /> The following summary points and conclusions were drawn from the results of the site investigation: <br /> MTBE was detected in the grab ground water samples collected at 55 feet bsg from soil <br /> borings B8 and B9,located approximately 50 and 100 feet down-gradient,respectively,from <br /> ' the former US Ts. MTBE was also detected,in the 70-foot sample,from soil boring B8. <br /> •' The MTBE concentration in the two grab ground water samples collected from 55 feet . <br /> exceed the DHS - established maximum contaminant level (MCL) of 5 [tg/l for MTBE in <br /> '. ground water; the DHS action level for MTBE is 13 µg/l. <br /> • MTBE, BTEX and TPH-g were not detected'in ground water samples MW-9 and MW-10 - <br /> during the initial ground water monitoring event on 04 April 2002. <br /> • The lateral and vertical extent of MTBE-impacted ground water down-gradient of the USTs <br /> ' has been delineated. <br /> 1 5.0. RECOMMENDATIONS ' <br /> ' Based upon data collected at the site,AGE recommends three quarterly groundwater monitoring. " <br /> events of selected wells on the site, with the next event to be conducted in early July 2002. <br /> 1' <br /> ' Advanced GeoEnvironmental,Inc. ' <br />