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' 07 November 2005 <br /> • AGE-NC Protect No 98-0448 <br />' page 8 of 9 <br /> • The average SVE inlet flow rate was estimated to be 42 cfm at an average differential <br />' pressure of 0 61 inches of water (Table 6) <br /> • Since initiation of the SVE system(April 2001),the total volume of petroleum hydrocarbons <br />' extracted is estimated to be approximately 315 gallons (Table 7) <br /> • TPH-g was not detected in any of the influent air flow samples collected from the site this <br />' quarter <br /> • On 16 May 2005, vapor well VW-2 and air sparge wells AW-1, AW-2 and AW-3 were <br />' closed to focus vapor extraction on the remaining areas of petroleum hydrocarbon-impacted <br /> soil and ground water <br /> • The SVE system may have extracted the majority of the available adsorbed soil <br />' contamination, as based on the decline trend in vapor samples collected <br /> I6.0. RECOMMENDATIONS <br />� . Based upon the results of this investigation, AGE recommends <br /> • Confirmation soil borings should be advanced at the site to at least 50 feet bsg to evaluate <br /> soil and ground water clean-up progress <br /> • Performance of aground water rebound response testis warranted at this time SVE and IAS <br /> operations should be suspended for 3 months (1 quarter), and ground water monitored on a <br /> monthly basis at wells MW-2 and MW-4(A and B)and vapor well VW-6 during the ground <br /> water rebound response test If monitoring wells do not show any significant hydrocarbon <br />' increases at the conclusion of the rebound response test, a site closure report may be <br /> warranted <br /> • Until site closure is warranted, continued quarterly ground water monitoring and sampling <br /> of wells MW-1, MW-2, MW-4A, MW-4B, MW-6, MW-8 and vapor well VW-6 , ground <br /> _ water sampling results will be used to monitor progress of the SVE and lAS remediation <br /> system <br /> 7.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> Ienvironmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br />■ Advanced GeoEnvironmentsl,Inc <br /> I <br /> t h <br />