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w1 w • <br /> ' 1 converting ppmv/v to mg/m3 <br /> (3700 ppmv(v)(86 18 mg/mole hexane l = 14,235 mg/m3 <br /> f22 4 L/mole <br /> f <br /> 2 mass removal rate <br /> (14,235 mg/m3)(24 cfm)(3 7*101 lb m3 min = 1 26 lbs/hour of hexane <br /> I mg ft hr = 30 34 pounds/day <br /> Based on these calculations, 3t appears that an ideal SVE system at the site would be able to <br /> affectively remove volatile TPH chemicals from the vadose zone over time For example, <br /> assuming there are 1,000 pounds of hexane in the vadose zone, a rough estimate of the time <br /> ` required for hexane removal can be calculated <br /> I <br /> 1,000 lbs/ 30 34 lbs/day = 33 days <br /> This time period is theoretical only, because substantial fluctuations in extraction and mass <br /> removal rates are common <br /> CONCLUSIONS <br /> Based on the SVE pilot test, SVE can be considered a viable method for vadose zone <br /> remediation The soil is marginally permeable, however with a multiple well approach <br /> combined with vacuum pressures below 110 inches wc, SVE will likely be an effective remedial <br /> option <br /> i <br /> 11101cd3 3 <br />