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1 <br /> a5 <br /> 13 May 2004 <br /> AGE-NC Project No 97-0290 <br /> Page 5 of 5 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds <br /> • Concentrations of TPH-g and benzene In well MW-2 have exhibited increasing trends over <br /> the past two years, as depicted in Appendix E <br /> • The overall influent hydrocarbon vapor concentrations decreased during the fourth quarter, <br /> an estimated 528 lbs gasoline (TPH-g) were removed from the subsurface of the site <br /> • Continued operation of the 1AS with SVE should result in a reduction of the hydrocarbon <br /> impact to soil and ground water <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • Due to the elevated dissolved concentrations in well MW-2 and the continual significant <br /> . vapor concentrations, AGE recommends operation and monitoring of the IAS and SVE <br /> operation for one additional quarter However, the general decline in influent vapor <br /> concentrations does indicate a reduced efficiency and should concentrations indicate <br /> diminishing effectiveness of the SVE operation and ground water concentrations decline <br /> accordingly over the following ground water monitoring event, AGE then recommends <br /> preparation of a closure report for the site <br /> • Performance of ground water monitoring,the next monitoring event should be scheduled for <br /> sewn uarter of 2004 <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 Evaluation of the subsurface conditions at <br /> the site for the purpose of this investigation was made from review of a limited number of available <br /> data points (soil vapor and 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 /> interpretations, opinions and recommendations contained in this report <br /> w <br /> Advanced GeoEnvi ron mental,Inc <br />