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1. converting ppmv/v to mg/m3 <br /> (3-700 ppmv/v),(86 18 mg/mole—hexane) = 14,235 mg/m3 <br />' 22.4 L/mole <br />' 2 mass removal rate <br /> (14,235 mg/m3)(24 cfm)(3.7*10-6 lb m3 min ) = 1 26 lbs/hour of hexane <br /> mg ft hr = 30 34 pounds/day <br />' Based on these calculations, it 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 /> 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 /> toption <br /> 1 <br /> 111 OIC413 3 <br />