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EM 1110-1-4001 <br /> 3 Jun 02 <br /> Table F-2 <br /> Parameters for Modeling PCE Removal at Site 2 <br /> Sod Property Units' Mobile Zone Immobile Zone <br /> Initial Vapor Concentration ppmv 650 565 <br /> Porosity ND 0 473 0 507 <br /> Moisture Content(vol) ND 0 080 0 343 <br /> Grain Density g/cm3 265 265 <br /> Characteristic Thickness m - 035 <br /> Characteristic Volume m3 151,300 689,265 <br /> Kd Ukg 0 018 0 072 <br /> Degradation Rate 11yr 0 0 <br /> PCE Properties <br /> Henry's Constant ND 1 10 <br /> Octanol-Water Partition ND 600 <br /> Diffusion Coefficient in Air m2/day 063 <br /> a ND = dimensionless <br /> With a calibrated model of site behavior during SVE, forecasts of future performance were possible and <br /> residual mass and concentration estimates could be compared with cleanup goals Predicted future <br /> performance at the site is illustrated in Figure F-7 where the operation of two wells was found to be the <br /> optimum The forecasted, optimized operating time to reduce the average PCE vapor concentration in <br /> the immobile zone to 10 ppmv is about 28 months beyond the operations at the time of modeling The <br /> residual PCE mass at 10 ppmv is estimated to be 61 pounds To reach an average of 1 ppmv in the <br /> immobile zone,extraction must continue another 20 months At this end,the residual PCE mass is <br /> estimated to be 6 pounds <br /> F-20 <br />