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k <br /> ^ S F k <br /> t <br /> I <br /> F r Yzi '9 C r—�tl <br /> 04 November 1996 T <br /> AGE-NC Project No 95-0142 ' y <br /> Page 3 of 4 ' <br /> If 'w I <br /> collected at concentrations up to 140 ppb (benzene, MW-3) MTBE was detected in samples from <br /> MW-3,'MW-4 and VW-2 at concentrations as great as 25 ppb (VW-2) Analytical results of the <br /> ground water samples are summarized in Table 2 The laboratory report(MAI Laboratory I D Nos <br /> 69202 through 69204) and chain-of-custody are included in Appendix B <br /> S <br /> 3 3 ANALYTICAL RESULTS OF PURGED WATER SAMPLES <br /> Neither TPH-g nor BTE&X compounds were detected in the sample collected from the barrel of ' <br /> k purge water on the site M TBE was detected ,n the barrel sample at a concentration of 20 ppb The <br /> laboratory report (MAI Laboratory I D No 69205) and chain-of-custody are included in Appendix- <br /> _ _ w , <br /> B <br /> •I I a <br /> 40 CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS <br /> Based upon data collected from the site, AGE has made the following conclusions <br />' Under the limited sampling schedule for this'monitoring period, the greatest c6ncentration <br /> of dissolved petroleum hydrocarbons were detected in the sample collected,from'MW-3 <br /> • Ground water surface has remained well above the tops `of the screened casings in all <br />' e monitoring wells at the site for the past year, therefore, samples collected from these wells <br /> may not be representative of the actual aquifer conditions . <br />' { Ground water flow direction in the vicinity of the former UST TK1-90 is toward the,east, <br /> therefore, MW-4may not represent true downgradient conditions at the site <br /> I 1 <br /> r <br /> 42 RECOMMENDATIONS <br /> Based upon past and present site conditions, AGE has'the following recommendations <br />' • At least one additional monitoring-well should be installed at the site The proposed well <br /> should be installed at least 50'to 60 feet east of vapor extraction well VW-3 This,will <br /> provide a more down gradient well to determine if the dissolved hydrocarbon plume is <br />' stable - <br /> • , Consideration should be given to replacing wells MW-1 through MW-3, as ground water <br /> I <br /> t 4 <br /> , <br /> n E k k w <br />