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I � r <br /> Ob September 2005 <br /> AGE-NC Project No 01-0877 <br /> iPage 4 of 4 <br /> i <br /> i The highest concentrations of contaminants were detected near the area of wells MW-1 and <br /> MW-3 These locations correspond to the location of the former UST#3,one of the possible <br /> mayor release point(s) of the UST system <br /> i <br /> i5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends <br /> iContinued quarterly ground water monitoring at the site The next quarter monitoring event <br /> was performed in July 2005 <br /> i • Based on the age of the UST release(s),the type of chlorinated contamination detected at the <br /> site, and the overall high concentrations of contaminants in ground water remaining at the <br /> i site, it is likely that the R M B releases have migrated vertically to great depths near the <br /> release point <br /> • The increasing dissolved contaminate concentrations indicates the occurrence of a significant <br /> imass of hydrocarbon Is present in soil at the water table level This impacted zone should be <br /> immediately be mitigated through direct-combined soil vapor extraction and ground water <br /> extraction (high-vacuum extraction/treatment or dual-phase) to prevent additional <br /> ihydrocarbon desorption into the mechanism of off-site migration with a northeast flowing <br /> ground water table <br /> i AGE is currently making preparations (permitting and encroachment) to proceed with the <br /> AGE-prepared Site Assessment and Interim Remediation Work Plan, dated 10 August 2005 <br /> and approved by EHD letter dated 25 August 2005 <br /> I <br /> i6.0. 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 Evaluation ofthe hydrogeologic conditions <br /> at the site for the purpose of this investigation was made from a limited number sof available data <br /> i points(e g ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied,is made as to the professional interpretations,opinions,and <br /> recommendations contained in this report <br /> i <br /> Advanced GeoEnvironmental,Inc <br /> I <br />