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07 January 1998 <br /> AGE-NC Project No 95-0130 <br /> Page 5 of 5 <br /> • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> wells VW-1C, VW-2A and VW-3A, Indicates that these wells are within the dissolved <br /> petroleum hydrocarbon "core area" of the plume <br /> • A plot of depth to ground water and TPH-g concentrations over time (Appendix E) suggests <br /> a positive correlation at MW-5 between Increasing ground water depths and Increasing TPH- <br /> Ig concentrations <br /> I5.0. RECOMMENDATIONS <br /> Based on the results of this and previous monitoring events, and on AGE's familiarity with the site, <br /> AGE recommends <br /> • Installation of the remediation system should commence upon regulatory approval of the <br /> Remedial Action Work Plan, dated 03 July 1997, submitted to the PHS-EHD for an in-situ <br /> soil vapor extraction/air sparging system within the petroleum hydrocarbon "core area" <br /> o Utilization of vapor extraction wells VW-1 through VW-3 for characterization of ground <br /> water conditions in the "core area" <br /> o Continued quarterly ground water monitoring The next quarterly monitoring and sampling <br /> is scheduled for December 1997 <br /> 6.0. 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 upon <br /> analytical results provided by an independent laboratory and a well casing elevation survey <br /> performed by an independent sub contractor Evaluations of the geologic/hydrogeologic conditions <br /> at the site for the purpose of this investigation were made from a limited number of available data <br /> points (I a monitoring well 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 /> I <br /> A&aneed GeoUnvironmenta[,Inc <br />