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i <br /> 02 Novembei 2001 <br /> AGE-NC Project No 95-0173 <br /> IPage 7 of 8 <br /> quantified in ground water samples collected from wells MW-1, MW-2, MW-3, MW-4, <br />' MW-6, AW-lA and AW-2B (Table 2) <br /> • Previous and current laboratory results of ground water samples suggest that there is a minor <br /> MTBE- and 1,2-DCA-impact to ground water in the areas of wells MW-2, MW-3,MW-4 <br /> and MW-5 (Tables 2 and 3) <br /> • Laboratory results of ground water samples collected from MW-13 (screened 95 to 100 feet <br /> bsg) suggest that the dissolved petroleum hydrocarbon plume extends to at least 100 feet bsg, <br /> and Is at least 70 feet thick, however, a trend of decreasing contaminant concentrations has <br /> been obsei v ed fiom well MW-13 for five consecutive sampling events <br /> I <br /> Based on SVE remediation data collected between 01 April 2001 and 30 June 2001,AGE concludes <br /> I • The average SVE inlet vapor concentration was approximately 1,440µg/l, the average SVE <br /> inlet flow rate was approximately 94 cubic feet per minute <br /> • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 149 gallons of petroleum hydrocarbons (Appendix F) during the second <br /> quarter 2001 monitoring period <br /> • Since initiation of the SVE system,the total volume of petroleum hydrocarbons extracted is <br /> estimated to be appioximately 878 gallons (Appendix F) <br /> I • No general concentration trends were evident In the PID field measurements, however, a <br /> geneial doe]ine from extracted soil-gas samples was apparent to analytical results over the <br /> 2"`` Quarter 2001 monitoring period <br /> 6.0. RECOMMENDATIONS <br /> Based upon second quarter 2001 data collected from the site, AGE recommends <br /> • Continued quay terly groundwater monitoring and sampling of wells MW-1 through MW-13, <br /> AW-1 A, AW-1B, AW-2A and AW-2B, ground water sampling results will be used to <br /> monitor progi ess of the SVE and IAS remediation system <br /> • Continued opec ation of the on-site SVE and IAS remediation system, remediation progress <br /> will be reevaluated on a quartet ly basis <br /> Advanced GeoEnviroomental,Inc <br />