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Ile 08 June 2003 <br /> AGE-NC Project No 98-0448 <br />' Page 8 of 9 <br />' • The average SVE inlet flow rate was estimated to be 34 cubic feet per minute (cfm) at an <br /> average differential pressure of 0 38 inches of water (Table 6) <br /> • A general decreasing concentration trend was evident at the SVE influent between the 4`h <br />' quarter 2002 and the l'quarter 2003 from the PID field measurements <br /> ■ IAS at well MW-4B (screened 45 to 50 feet bsg) appears to have reduced petroleum <br />' concentrations to almost non-detectable levels <br /> • Since Initiation of the SVE system,the total volume of petroleum hydrocarbons extracted is <br /> estimated to be approximately 230 gallons (Table 7) <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 and MW-6 Ground water sampling results will be used to monitor <br />' progress of the SVE and IAS remediation system <br /> • Continued operation of the on-site SVE and IAS remediation system The remediation <br />' progress will be re-evaluated on a quarterly basis <br /> • Due to almost non detectable petroleum concentrations reported at well MW-4B,air sparging <br /> activities should be exchanged from MW-4B(screened 45 to 40 feet bsg)to IAS wells AW-1 <br />' through AW-4(screened 25 to 30 feet bsg)to address the petroleum concentrations reported <br /> at wells MW-2 and MW-4A <br />' • Because the 1AS piping system Is manifolded at the site, IAS cannot be performed at the site <br /> simultaneously from shallow wells AW-1 through AW-4 and from the deeper well MW-4B <br /> During the upcoming 2nd quarter 2003, AGE plans to conduct IAS activities from shallow <br />' wells AW-1 through AW-4 Because AGE has observed moderate to significant success <br /> while conducting 1AS at well MW-4B, AGE recommends that a second air compressor(2 5 <br /> horsepower or less) be installed at the site so that 1AS activities can be performed <br />' continuously in both shallow and deeper water zones <br /> 7.0. 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 /> Advanced GcoEnvironmeatal,Inc <br /> I <br />