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14 February 2003 <br /> . AGE-NC Project No 98-0432 <br /> Page 5 of 6 <br />' <br /> 33 GROUND WATER ANALYTICAL RESULTS <br /> J � � <br /> TPH-g and BTEX compounds were not detected in the ground water samples analyzed TPH-dwas <br /> detected in ground water sample MWA at a concentration of 64 micrograms per liter (gg/1), and <br /> MTBE detected was in water samples MW-1, MW-2 and MW-7 by EPA Method 8260 at f <br /> concentrations of 1,800 gg/l, 54 gg/l and 84gg/l, respectively(Figure 4) <br />' No additional petroleum hydrocarbon compounds were detected in the samples analyzed Analytical <br /> results from ground water samples are summarized in Tables 2 and 3 The laboratory reports(MAI <br />' Laboratory ID 0212154-001A to 008A),quality assurance and quality control(QA/QC)reports and <br /> chain-of-custody forms are included in Appendix C <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The following conclusions were drawn from the results of this investigation <br /> • During the December 2002 monitoring event,the ground water flow direction was northwest, <br /> lie <br /> which was similar to the prevailing northerly flow direction at the site, the gradient ranged <br /> between 0 002 ft/ft in the area of the former USTs to 0 003 ft/ft at the northern end of the <br /> site <br /> ' TPH-d was detected only in sample MW-1 <br /> • MTBE was detected in samples MW-1,MW-2 and the off-site well MW-7 at concentrations <br /> ' as high as 1,800 gg/l MTBE concentrations in the wells have exhibit a generally declining <br /> trend since monitoring was initiated in May 2000 (Table 3) <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> ' • Continuation of quarterly groundwater monitoring, the next monitoring event is scheduled <br /> for March 2003 <br /> • Preparation of corrective action plan for the remediation of MTBE-impacted groundwater r <br /> x <br /> ' Advanced GcoEnvironmental,Inc <br />