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K=V * n/I <br /> i K= 3781 feet/year=10 35 ft/day ` <br /> Assuming a soil density Pb of 18, it is possible to calculate the apparent organic carbon content <br /> X =Pb/n*Oc <br /> Or.=X*n/Pb= 0 0044 * 0 3 / 1 8 = 0 0007 <br /> Known from above <br /> V =42 85 feet/year, X=0 0044 <br /> Velocity MTBE =40.7 feet/year <br /> Velocity Benzene = 30 04 feet/year <br /> Velocity Toluene = 20 74 feet/year <br /> Velocity Ethylbenzene = 11.46 feet/year <br /> Velocity Xylenes = 12 50 feet/year <br /> Estimated assume average porosity (n) for sand of 0 3 and soil density (Pb) of 1 8 <br /> Average hydraulic conductivity (K) of transport sand channel= 10 35 feet per day <br /> Average organic carbon content = 0 0007 or 0 07 percent <br /> The velocities of benzene and toluene were calculated from the first occurrence of major <br /> concentration fronts moving out from the site The distance traveled was the considered to be the <br /> difference in the distance from the plume origin and not the distance between MW8 and MW12 <br /> These compound retarded velocities and the groundwater velocity are respective of the higher <br /> velocity sands in the formation and not the entire formation, Therefore the K calculated from this is <br /> lugher than the Ks from the slug test which reflect and average over the entire water column <br /> At these velocities the first occurrence of benzene in MW8 will be approximately 4 years after <br /> benzene entered the groundwater on site <br />