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i <br /> 06 October 1997 <br /> AGE-NC Project No 95-0143 <br /> Page 3 of 4 <br /> concentration of 1 3 ppb <br /> Petroleum hydrocarbons were not detected in the samples collected from MW-10, MW-15, MW-16 <br /> or MW-17 Free product was not encountered in any of the wells on the site Analytical results of <br /> ground water samples are summarized on Tables 2 and 3 The laboratory report (MAI Laboratory <br /> I D Nos 79644 - 79652) and chain-of-custody forms are included in Appendix B <br /> I4 0 SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> I0 Petroleum hydrocaibons were not detected in wells MW-10, MW-15, MW-16 and MW-17, <br /> thereby delineating the maximum horizontal extent of impacted ground water The plume <br /> of impacted ground water does not appear to be actively migrating <br /> • Free product was not encountered at the site during the August monitoring event However, <br />�• ground water is above the screened interval in MW-3, which could prevent the detection of <br /> free product, if present <br /> • Between May and August 1997, total petroleum hydrocarbon concentrations decreased in <br /> MW-6, MW-7, and MW-9 Hydrocarbon concentrations increased slightly in wells MW-3, <br /> and MW-14, the latter having 0 51 ppb benzene the first hydrocarbons detected in that well <br /> In general, hydrocarbon concentrations have followed a fluctuating, poorly defined trend <br /> since quarterly monitoring began <br /> • Low concentrations of 1,2-dichloroethane and di-isopropyl ether (DIPS) were detected in <br /> MW-14 Low concentrations of chloroform and methyl ethyl ketone were detected in MW- <br /> 10 A low concentration of chloroform was detected in MW-16 <br /> I <br /> 0 RECOMMENDATIONS <br /> Based upon data collected during the August 1997 sampling event,AGE recommends the following <br /> • A Remedial Action Work Plan(RAWP)has been submitted and approved by the PHS-EHD <br /> Installation and operation of the approved remediation system should be initiated <br /> - The next quarterly monitoring at the site will be scheduled for November 1997, concurrent <br /> with monitoring at the Madison site <br /> I <br /> Advanced CeoEn,.vonmental,Inc <br />