MODELING OF CONTAMINANT TRANSPORT RESULTING FROM DISSOLUTION OF NONAQUEOUS PHASE LIQUID POOLS IN SATURATED POROUS-MEDIA

A mathematical model for transient contaminant transport resulting fro m the dissolution of a single component nonaqueous phase liquid (NAPL) pool in two-dimensional, saturated, homogeneous porous media was deve loped. An analytical solution was derived for a semi-infinite medium u nder local equilibrium conditions accounting for solvent decay. The so lution was obtained by taking Laplace transforms to the equations with respect to time and Fourier transforms with respect to the longitudin al spatial coordinate. The analytical solution is given in terms of a single integral which is easily determined by numerical integration te chniques. The model is applicable to both denser and lighter than wate r NAPL pools. The model successfully simulated responses of a 1,1,2-tr ichloroethane (TCA) pool at the bottom of a two-dimensional porous med ium under controlled laboratory conditions.