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' 31 August 2004 <br /> AGE-NC Project No 95-0173 <br /> IPage 10 of 10 <br /> I A spike in the PID field measurements and influent SVE air samples was evident during the <br /> fourth quarter 2003 monitoring period and coincided with the operation of IAS well AW-IB <br /> and the reconfiguration of the SVE well network from VW-1 through VW-7 to VW-1 <br /> through VW-4 SVE Wells VW-5 through VW-7 were closed at the well-heads due to only <br /> trace levels of petroleum hydrocarbons observed at these wells from PID field measurements <br /> (Table 6) However, during the first quarter 2004 monitoring period, IAS well AW-2B was <br />' utilized and concentrations steadily declined to non-detect levels <br /> I5.0. RECOMMENDATIONS <br /> Based upon first quarter 2004 data collected from the site, AGE recommends <br /> • Continued quarterly ground water monitoring and sampling at the site,to reduce unnecessary <br /> sampling/analytical costs AGE recommends removal of wells with four consecutive events <br /> with no detection of contamination from the sampling program (MW-7, MW-8, MW-10, <br /> MW-11 and MW-12) Ground water sampling of the remaining should continue quarterly <br /> • to monitor progress of the SVE and IAS remediation system <br /> IContinued operation of the on-site SVE and IAS remediation system, however, to optimize <br /> the effective radius of Influence in the `core' area of the plume, AGE recommends only <br /> I extraction from SVE wells VW-1, VW-2 and alternating sparging pressure to wells AW-1 <br /> (A and B) Remediation progress will be re-evaluated on a quarterly basis <br />' G.O. LIMITATIONS <br />' Our professional services were performed using the degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> I upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br /> conditions at the site for the purpose of this investigation is made from a limited number of available <br /> data points (e g ground water and soil vapor samples), and subsurface conditions may vary away <br /> from these data points No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions and recommendations contained in this report <br /> IAdvanced GeoEnvironmental,Inc <br />