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' 06 April 2005 <br /> . AGE-NC Project No 98-0448 <br />' Page 8 of 9 <br />' Based on SVE/lAS remediation data collected between 23 September 2004and 22 December 2004, <br /> AGE concludes <br />' • The volume of hydrocarbons extracted by the SVE system was calculated to be <br /> approximately 131 pounds during the fourth quarter 2004,or equivalent to an approximate <br /> volume of 21 gallons of gasoline extracted (Appendix F) or seven percent (7%) of the total <br />' hydrocarbons removed <br /> • The average SVE Inlet flow rate was estimated to be 22 cubic feet per minute (cfm) at an <br /> average differential pressure of 0 22 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, 302 gallons (Table 7) ' <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 /> 6.0. 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 /> • 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 and MW-8,ground water sampling results <br /> will be used to monitor progress of the SVE and IAS remediation system <br />' Although analytical results of SVE air flow samples suggested very low levels,operation of <br /> the existing SVE remediation system still appears to have a positive and beneficial effect in <br />' mass removal of hydrocarbon-impacted soil vapor, albeit at low concentrations Therefore, <br /> AGE recommends continued operation of the on-site SVE remediation system and will be <br /> re-evaluated on a quarterly basis Based on the current data,AGE anticipates operation of the <br /> tSVE remediation system at least through the second quarter 2005 calendar year <br /> t <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 /> analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br />' Advanced GeoEnvironmental,Inc <br /> I <br />