Laserfiche WebLink
22 April 2002 <br /> AGE-NC Project No 98-0448 <br /> Page 7 of 8 <br />' Previous and current analytical results from ground water samples suggest that there is a <br /> minor MTBE, DIPE and TBA-impact to ground water in the areas of wells MW-1, MW-2, <br /> MW-4 and MW-6 (Table 2) <br />' Laboratory results of ground water 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 October 2001 and 31 December 2001, AGE <br /> concludes <br /> • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 127 pounds, or approximately 20 4 gallons of petroleum hydrocarbons <br /> extracted (Appendix F) during the fourth quarter 2001 monitoring period <br />' • The average SVE inlet flow rate was 34 cubic feet per minute(cfin)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 /> a general decline from extracted soil-gas samples was apparent in analytical results over the <br /> Fourth Quarter 2001 monitoring period <br /> 6.0. 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 /> • Monthly depth to ground water measurements collected from all monitoring wells (MW-1 <br /> through MW=8)"ta monitor fof ground watef 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 /> Advanced GeoEnvironmental,Inc <br /> 1 <br />