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1 <br />' 06 April 1998 <br /> • AGE-NC Project No 95-0184 <br /> Page 3 of 4 <br /> 2 and 3 The laboratory report (MAI sample Nos 85560-85569) and chain-of-custody forms are <br />' included in Appendix B <br /> Hydrocarbon concentrations detected in samples collected from MW-4,VW-213,VW-3,VW-4,VW- <br /> 5B and VW-5C are indicative of the presence of free product The laboratory report noted a "lighter <br /> than water immiscible sheen"in the samples collected from MW-4 and VW-5C Lower hydrocarbon <br /> concentrations were detected in MW-7, located between MW-4 and the remaining wells The lower <br /> hydrocarbon concentrations detected in samples collected from MW-1, MW-2 and MW-3 are likely <br /> due to drowning of these wells <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site,AGE concludes the following <br /> • Petroleum hydrocarbons were detected in each well sampled, at concentrations as high as <br /> 170,000 ppb Traces of free product have been detected intermittently at the site Additional <br /> • monitoring wells will be necessary to delineate the horizontal extent of hydrocarbon- <br /> impacted ground water <br /> • The inferred ground water flow direction has generally remained toward the east to southeast <br /> at the site <br /> • Ground water is approximately sixteen feet above the screened interval in monitoring wells <br /> MW-1 through MW-3, six feet above the screened interval in MW-4 and near the top of the <br /> screened interval in MW-7 These wells recharge rapidly, possibly pi eventing significant <br /> drawdown in wells MW-1 through MW-3 during purging The hydrocarbon concentrations <br /> tdetected in these `drowned' wells may not be representative of shallower ground water where <br /> the maximum hydrocarbon impact would be expected <br /> • Ground water is currently within the screened interval in four vapor wel is The data collected <br /> from these wells should be representative of shallow ground water conditions <br /> • The lateral extent of hydrocarbon-impacted soil at the site has not been defined Soil samples <br /> collected during the installation of additional monitoring wells may be used to define the <br /> extent of impacted soil <br /> 50. RECOMMENDATIONS <br /> IBased upon data collected from the site, AGE recommends the following <br /> Advanced GeoEnvironmental,Inc <br /> i <br />