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1 <br /> 41 <br /> 07 December 2004 <br /> AGE-NC Project No 98-0448 <br /> Page 9of9 , <br /> • A spike in the PID field measurements and influent SVE air samples was evident during the <br /> June 2004 monitoring period and coincided with the reconfiguration of the SVE/IAS <br /> remediation system network to include newly installed wells AW-5 and VW-6 SVE Wells <br /> VW-2 through VW-5 have since been closed at the well-heads due to non-detectable levels <br /> of petroleum hydrocarbons observed at these wells from PID field measurements <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,groundwater 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 /> SVE remediation system at least through the first quarter 2005 calendar year <br /> I <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 /> j conditions'at the site for the purpose-of this'investigation were made from a limited-number of <br />' available data points (i a soil-gas samples and monitoring well ground water samples), and <br /> subsurface conditions may vary away from these data points No other warranty, expressed or <br /> implied,is made as to the professional interpretations,opinions and recommendations contained in <br /> Ithis report <br /> Advanced GeoEnvironmentai,Inc <br /> I <br />