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1 Vadose Zone Model <br /> The vapor concentration in the source zone is calculated from Henry's Law <br /> S A-ll <br /> C'� = KwCx, 1000cm3 1000mg (A-11) <br /> ' where <br /> KH = Henry's Law Constant for chemical [(mg/I vapor)/(mg/l <br /> water)] <br /> A 4 3 Effective Diffusion Coefficients <br /> The effective diffusion coefficient in vadose zone soil and the lens soil is estimated <br /> using the Millington-Quirk relationships <br /> ' 0 1013 ]013 <br /> Drf, DDa, 2 +Dµ,,,, K e z (A-12a) <br /> gr, H r, <br /> ' sur3 � iory <br /> @alma 1 BWrer� <br /> Diff 1, Darr = +D._, 2 (A-12b) <br /> 01 km KH e,,,.Ra <br /> ' where <br /> Dep„ = effective diffusion coefficient for the vadose zone above <br /> the source(not including the lens) [CM2/Sl <br /> ' D�yj = effective diffusion coefficient for the lens [cm2/s] <br /> A, = molecular diffusion coefficient for chemical in air <br /> ' [cm21s] <br /> D,r� —er molecular diffusion coefficient for chemical in water <br /> [cm 2/S] <br /> ' BQ = air-filled porosity in the vadose zone [cm3 air/cm3 soil] <br /> ow = water-filled porosity in the vadose zone [cm3 water/cm3 <br /> ' soil] <br /> 07v = total porosity in the vadose zone [cm3 pores/cm3 soil] <br /> ' 0.leaf = air-filled porosity in the lens [cm3 air/cm3 soil] <br /> 1 <br /> A-9 <br />