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4 <br /> 30 May 1997 , <br /> 1 <br /> AGE-NC Project No 95-0142 <br /> Page 5 of 6 - <br /> , <br /> TPH-g was detected in the sample collected from well MW-5 at a concentration of 450 ppb BTE&X, i r, <br /> compounds were detected in the same sample at concentrations as high as 9 8 ppb (benzene) , <br /> Additionally, MTBE,was detected in the sample at a concentration of 17 ppb Detectable <br /> concentrations of petroleum hydrocarbons were not present in the sample from MW-4 ,r, T �� <br /> 1 If , <br /> i <br /> s 1 <br /> Analytical results of all ground water samples are summarized in Table 2 -Analytical Results of <br />' Ground Water Samples The laboratory report (MAI Laboratory I D Nos 72128 through 72132 " <br /> and 75978), chains-of-custody and QA/QC reports are included in Appendix D J. <br /> 3 3 ANALYTICAL RESULT'S OF PURGED WATER SAMPLES i <br />' Detectable concentrations of petroleum hydrocarbons were not present in the sample collected from" <br /> 4 the,barrel of purge water stored"on-site The laboratory report (MAI Laboratory I D No 72133), <br /> chain-of-custody and QA/QC report are included in Appendix D r <br /> Ir <br /> r 1 <br /> 34 ANALYTICAL RESULTS OF SOIL SAMPLESlie <br /> r <br /> TPH-g,BTE&X or MTBE were not detected in the two soil samples analyzed The laboratory report <br />' (MAI Laboratory ID 75882 and 7-5883),-QA/QC report and chain-of-custody are in Appendix E <br /> F 1 <br /> l y <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 41 CONCLUSIONS , <br /> Based upon data collected from the site, AGE has made the following conclusions - ,4 <br />'' •' The ground water surface at the site has remained approximately ten feet above the tops of <br /> 1,a <br /> the screened casings in ground monitoring wells MW-1 through MW-3 for the past yeas, <br /> therefore;samples collected from these wells may riot be representative'of the upper aquifer <br /> conditions where the maximum impact of fuel hydrocarbons would be expected <br /> • Ground water flow direction is toward the east in the vicinity of the hydrocarbon release <br /> (TK 1-90), therefore, MW-5 now represents theldown-gradient'condition at the site } <br /> • Overall, concentrations of hydrocarbons at the I site ,have decreased The greatest concentration of dissolved petroleum hydrocarbons was detected in'-vapor well VW-1', <br /> Iocated immediately adjacent to the former TKI-90 UST <br /> F i <br /> t 1 ! <br /> r 1 L 1 <br />