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c <br /> 10 December 2001 <br /> AGE-NC Project No 98-0448 <br /> Page 7 of 8 <br /> I Laboratory results of groundwater samples collected from MW-4B (screened 45 to 50 feet <br /> bsg) suggest that the dissolved petroleum hydrocarbon plume extends to at least 50 feet bsg, <br /> and Is at least 30 feet thick <br /> Based on SVE remediation data collected between 01 July 2001 and 30 September 2001, AGE <br /> concludes <br /> I • The volume of hydrocarbons extracted b the SVE system was calculated to be <br /> Y Y Y <br /> approximately 222 pounds, or approximately 35 5 gallons of petroleum hydrocarbons <br /> extracted (Appendix F) during the third quarter 2001 monitoring period <br /> • The average SVE inlet flow rate was 34 cubic feet per minute(cfm)at an average differential <br /> pressure of 0 35 inches of water(Table 5) <br /> • No consistent concentration trends were evident in the PID field measurements, however, <br /> I a general decline from extracted soil-gas samples was apparent In analytical results over the <br /> 3rd Quarter 2001 monitoring period <br /> lie <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends <br /> • Continued quarterly ground water monitoring and sampling of wells MW-1, MW-2, <br /> MW-4A,MW-4B,MW-6 and MW-8, ground water sampling results will be used to monitor <br /> progress of the SVE and IAS remediation system <br /> I • Monthly depth to ground water measurements collected from all monitoring wells (MW-1 <br /> through MW-8) to monitor for ground water mounding resulting from IAS <br /> • Continued operation of the on-site SVE and IAS remediation system, remediation progress <br /> will be reevaluated on a quarterly basis <br /> IAdvanced Geo Environmental,Inc <br />