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r , <br /> r <br /> 16 October 1996 <br /> AGE-NC Project No 96-0211 <br /> ' - Page 5 of 6 <br /> TPH-g was detected in the ground water samples from monitoring well MW-1, MW-2 and MW-3 <br /> at a concentrations of 1,600,,2,900`and 3,500 ppb, respectively BTE&X compounds were detected <br /> in the water sample from monitoring well samples at a maximum concentration of 290,ppb of total 3 <br /> I xylenes Benzene was detected at concentrations of 3 9 ppb, 11 ppb and 7 5 ppb in monitoring wells <br /> MW1,MW2 and MW3,respectively MTBE was detected in each monitoring well,with a maximum <br /> concentration of 16 ppb in MW2 Analytical results of ground water samples are summarized on <br /> I Table 3` The laboratory report (MAI Laboratory ID 66728 through 66730) and chain-df-custody are <br /> presented in Appendix E r <br /> 5 0. CONCLUSIONS AND RECOMMENDATIONS <br /> i <br /> 51 CONCLUSIONS 7 <br /> Based upon results of the soil probing investigation and monitoring well installation, we have the <br /> following conclusions <br /> 1r <br /> •, Hydrocarbon-impacted soil at the site is limited to the capillary fringe or saturated zone It <br /> is likely that the impacted soil extends off-site under Holly Drive and Grant Line Road <br /> • The lateral extent of hydrocarbon-impacted ground water at the site has not been determined <br /> Furthermore, it appears that impacted ground water extends off-site to the north, east and <br /> south, and may extend further west on-site and possibly off-site <br /> • The highest concentrations of dissolved hydrocarbons were detected in the up-gradient well ti <br /> on the site, up-gradient from the former USTs This distribution of dissolved hydrocarbons <br /> might indicate that a second source of contaminates is or was present up-gradient from the <br />' site s ' <br /> 52 RECOMMENDATIONS <br /> Based upon the results of the investigation, AGE has the following recommendations <br /> 4 <br /> • t Additional shallow soil borings may be necessary to determine the lateral extent of <br /> hydrocarbon-impacted soil within the capillary fringe and/or lower vadose zone <br /> • AGE recommends a sdnes of soil bonng/probings and grab ground water samples to aide in <br /> the placement of future ground water monitoring wells A site-specific work plan detailing <br /> the necessary scope of work; should be submitted to the PHS-EHD <br /> 1 <br />