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1 - - <br />' 16 June 2004 <br /> AGE-NC Project No 95-0173 <br /> Page 9 of 9 <br />' VW-7 were closed at the well-heads due to only trace levels of petroleum hydrocarbons <br /> observed at these wells from PID field measurements (Table 6) <br /> 6.0. RECOMMENDATIONS <br /> Based upon fourth quarter 2003 data collected from the site, AGE recommends <br /> • Continued quarterly ground water monitoring and sampling of wells MW-1 through MW-13, <br />' AW-lA, AW-1B, AW-2A and AW-2B, ground water sampling results will be used to <br /> monitor progress of the SVE and IAS remediation system <br />' • Continued 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 /> extraction from SVE wells VW-1 and VW-2 and sparging pressure to wells AW-1 (A and <br /> B)and AW-2(A and B) Additionally,air-flow pressure regulators should be installed at the <br /> well-heads of AW-1 (A and B) and AW-2 (A and B) which will allow independent control <br /> of air-flow to each IAS well,and allow continuous air spargmg to individual wells in the 1AS <br />' network Remediation progress will be re-evaluated on a quarterly basis <br /> • Redevelopment of well MW-11 to remove approximately 6-vertical feet of accumulated <br /> sediment <br /> 1 <br /> 7.0 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 /> 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 SVE air flow 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 /> Advanced GeoEnvironmcntal,Inc <br />