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30 July 1999 <br /> AGE-NC Project No 95-0143 <br /> Page 7 of 8 <br /> these wells The detection of hydrocarbons in samples from these wells is suspect The approximate <br /> lateral extent of impacted ground water is defined by MW10, MW16, SW9, MW14, MW17 and <br /> MW15 The ground water plume is centered near MW-3 with SWI l located in the down-gradient <br />' migration of contaminants <br /> Free product was not encountered in any of the wells on the site Analytical results of ground water <br />' samples are summarized on Tables 4 through 6 The laboratory report (MAI Laboratory I D Nos <br /> 10569-10577) and chain-of-custody forms are included in Appendix D <br />' 4.0. SUMMARY/CONCLUSIONS <br />' Based upon data collected from the site, AGE concludes <br />' 0 TPH-g was detected in soil samples collected during the installation of vapor and spargmg <br /> wells at concentrations as high as 14,000 ppm The highest concentrations of hydrocarbons <br /> were detected in soil samples collected from borings VW5 and SW21 <br /> • Ground water elevation increased an average of 0 8 feet between February and May 1999 <br /> The inferred ground water flow direction remains towards the north to northeast at the site <br />' Measurable free product was not encountered during the May 1999 monitoring event <br /> However, what appeared to be product was encountered during the drilling of VW5 and <br /> SW21 <br />' Monitoring wells MW-3 and MW-9 are the most intensely impacted wells despite also <br /> having the thickest saturated zone above the well screens <br /> • The concentrations of hydrocarbons detected in MW-15, MW-16 and MW-17 were almost <br /> identical Only traces of hydrocarbons had previously been detected in 4 of the 42 samples <br />' collected from these wells The detection of hydrocarbons in samples collected from these <br /> wells is suspect and may not be representative of aquifer conditions at these points <br /> • Petroleum hydrocarbon concentrations have remained generally stable at the site In general, <br />' hydrocarbon concentrations have followed a fluctuating,poorly defined trend since quarterly <br /> monitoring began <br /> I The SVE and IAS units have been delivered to the site Installation of piping from the wells <br /> to the SVE and IAS units is nearly complete <br /> I <br /> Adtianced GcoEnvironmcntal,Inc <br />