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14 May 2002 <br /> AGE-NC Project No 97-0343 <br />' Page 3 of 4 <br />' OV readings ranged from 108 to 363 ppm Induced vacuum measured at the extraction well(VW-2) <br /> ranged from 54 to 72 inches of water <br /> As expected,the greatest vacuum was measured in the observation point nearest the extraction well <br /> (VW-1) The lowest vacuum was measured to MW-6, approximately 66 feet north of the extraction <br /> point The maximum vacuum measured at the observation points during the pilot test was plotted <br /> versus the distance from the extraction well The effective radius of influence was determined by <br /> drawing a best-fit line though data points VW-1 and VW-3 only because these wells are screened <br /> at the same interval (15 feet to 35 feet) as the extraction well (VW-2) utilized for the test At a <br /> vacuum potential of 0 10 inches of water, the radius of influence is approximately 25 feet, at an <br /> induced vacuum potential of 1 0 inches of water, the radius of influence is approximately 18 feet, <br /> at 10 0 inches of water the radius of influence is approximately 8 feet Based on the United States <br />' Environmental Protection Agency(EPA)-prepared document,How to Evaluate Alternative Cleanup <br /> Technologies For UST sates the radius of influence is considered to be the distance from the <br /> extraction well at which a vacuum of at least 0 1 inches of water is observed Based upon an <br />' effective vacuum potential of 0 1 inches of water, the calculated effective radius of influence at the <br /> site will be approximately 25 feet Figure 3 depicts the effective radius of influence <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br /> • Based upon an effective vacuum potential of 0 1 inches of water, the calculated effective <br /> radius of influence at the site for vapor wells screened from 15 feet to 35 feet bsg will be <br /> approximately 25 feet <br /> 5 0. RECOMMENDATIONS <br /> AGE recommends additional feasibility g testin be performed at the site and a Problem Assessment <br /> Report (PAR) be prepared <br />' Advanced GeoEnvironmental,Inc <br />