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1 <br />' 19 October 2005 <br /> AGE-NC Project No 99-0645 <br />' Page 6 of 6 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE concludes <br />' • Approximately 30 1 kg (66 4 pounds), or 10 62 gallons of hydrocarbons were extracted by <br /> the SVE system between March and June 2005 The volume and mass calculations are <br />' attached in Appendix D <br /> • A total of 1,204 lbs,or 192 gallons of hydrocarbons were extracted by the SVE system since <br />' 05 October 2004 Soil-vapor extraction samples demonstrated a decline in concentrations <br /> below detection limits and were not adequate for continued remediation <br /> • The ground water flow direction in April was inferred to be southwest at a gradient of <br />' approximately 0 00075 ft./ft and in July was inferred to be south at a gradient of <br /> approximately 0 0017 ft/ft <br />' • CDCs were not detected in ground water monitoring well samples <br /> • COCs were not detected in the effluent SVE samples <br /> 1 � <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends discontinuation of the soil-vapor <br /> extraction and preparation of a closure summary report <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 ofthe hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number of available data <br /> points(e g ,soil-vapor,ground water samples)and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional interpretations, <br /> opinions and recommendations contained in this report <br /> • <br /> IAdvanced GeoEnvironmenta[,Inc <br />