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26 October 2004 <br /> AGE-NC Project No 97-0290 <br />' Page 6 of 6 <br />' The highest concentrations of contaminants were detected near the area of wells MW-2 and <br /> MW-4, which is the location of the former UST and directly down-gradient of the former <br /> USTs However,concentrations of dissolved BTEX and TPH have steadily and significantly <br />' declined since remediation at the site began The BTEX plume appears to be stable and <br /> declining, with the core of the plume limited to the northern�ortion of the site <br /> Z <br /> • Concentrations of TPH-g and benzene in well MW-2 have`exhibited decreasing trends over <br />' the past two years, as depicted in Appendix F <br /> • The overall Influent hydrocarbon vapor concentrations decreased during 2004 to low to non <br />' detectable level, an estimated 534 lbs gasoline (TPH-g) were removed from the subsurface <br /> of the site <br />' Continued operation of the IAS with SVE could 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 /> F,O,,,J 0&-% <br /> • "Declining dissolved concentrations in well MW-2 and the continual reduction of significant <br /> vapor concentrations,AGE recommends a thirty-day soil-vapor extraction rebound analysis <br /> However, the general decline in influent vapor concentrations does indicate a reduced <br /> efficiency and should concentrations indicate diminishing effectiveness of the SVE operation <br /> and ground water concentrations decline accordingly over a following ground water <br /> monitoring event, AGE then recommends preparation of a closure report for the site <br /> 1 <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 (I a soil-vapor and ground water samples) and subsurface conditions may vary away <br /> from 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 /> • <br /> Advanced GeoEnvironmental,Inc <br />