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f - <br /> 17 May 2006 <br /> • AGE-NC Project No 03-1071 <br /> IPage 5 of 5 <br /> samples at concentrations as high as 4 7 µg/l benzene, 12 µg/l toluene, 58 µg/1 ethylbenzene <br />' and 200 µg/1 total xylenes, MTBE was detected at concentrations as high as 5,000 µg/l <br /> (Table 2) <br /> • Based upon an effective vacuum potential of 0 1 inches of water, the theoretical effective <br /> radius of Influence of SVE at the site will be approximately 42 feet(Figure 3, Appendix B) <br />' The combined mass of SVE hydrocarbons extracted during the 8-hour SVE pilot test was <br /> calculated to be approximately 11 64 pounds,or equivalent to a volume of approximately 1 9 <br /> gallons of gasoline (Appendix D) <br />' 4.0. CONCLUSIONS <br /> Based on overall high hydrocarbon concentrations in soil-vapor samples and the calculated effective <br />' radius of Influence (42 feet), 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 AGE concludes that soil vapor extraction could <br />'0 <br /> be used as a feasible Interim remediation option for treatment of hydrocarbon impacted soil at the <br /> site <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings of this Investigation,AGE recommends preparation of an Interim remediation <br /> work plan proposing SVE as the remediation technology to be used to mitigate the TPH-g, BTEX <br /> and MTBE-adsorbed soil at the site <br /> 1 t <br /> 6.0. 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-vapor and ground water samples) and subsurface conditions may vary <br />' away 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 /> 1 <br />' Advanced GeoEnvironmental,Inc <br /> I <br />