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15 December 2005 <br /> AGE-NC Project No. 03- 1071 <br /> Page 14 of 14 <br /> specific aquifer characteristics inferred from the pumping test, AGE concludes that ground water <br /> extraction should not be implemented as a successful remedial method onsite. However, duel-phase <br /> extraction, utilizing high vacuum and lower ground water flow rates, would be well suited to quickly <br /> de-water the well gravel pack and remove vapors near the extraction well. <br /> Based on overall high hydrocarbon concentrations in soil gas/vapor samples and the calculated <br /> effective radius of influence, SVE should effectively reduce adsorbed hydrocarbon concentrations <br /> in vadose zone soils through the use of a vacuum that creates a negative pressure gradient to cause <br /> movement of vapors toward the extraction wells. The recommended use of duel-phase extraction is <br /> consistent with findings of the SVE pilot test. <br /> 7.0. RECOMMENDATIONS <br /> Y <br /> AGE recommends preparation of a remedial action work plan proposing duel-phase (SVE/water <br /> extraction) as the remediation technology to be used at the site to mitigate petroleum <br /> hydrocarbon-impacted soil and dissolved petroleum in the ground water. <br /> 8.0. 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 of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (soil, soil vapor and ground water samples) and subsurface conditions may vary <br /> away from these datapoints. No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions and recommendations contained in this report. <br /> Advanced GeoEnvironmental, Inc. <br /> M <br />