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' 30 March 1999 <br /> i AGE-NC Project No 95-0173 <br />' Page 5 of 5 <br /> or near the dissolved petroleum hydrocarbon"core area" of the plume <br />' The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br /> current array of ground water monitoring wells, however the increased hydrocarbon <br /> concentrations reported in wells VW-1, MW-3 and MW-4 and decreased concentrations <br /> reported in well MW-6 may indicate migration of the plume east-northeastward <br /> 1 <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected during January 1999, AGE recommends <br />' • Continued quarterly ground water monitoring and sampling should be performed at the site <br /> to monitor dissolved TPH-g, TPH-d,BTEX, MTBE and fuel oxygenating compounds at the <br /> site The next quarterly monitoring event should be tentatively scheduled for April 1999 <br /> 0 Continued utilization of wells VW-1, AW-1B and AW-213 for characterization of ground <br /> water conditions in the "core area" <br /> • . Installation of the remediation system upon regulatory approval of the Remedial Action Work <br /> Plan, dated 30 December 1998, submitted to the PHS-EHD for an in-situ soil vapor <br /> 1 extraction/air sparging system within the petroleum hydrocarbon "core area" <br />' 60. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points (e g ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> Advanced GeoEnraronmental,Inc <br />