MODELING OF TRANSPORT IN GROUNDWATER FOR ENVIRONMENTAL RISK ASSESSMENT

This paper presents the principles underlying a recently developed num erical technique for modeling transport in heterogeneous porous media. The method is then applied to derive the concentration mean and varia nce, the concentration CDF, exceedance probabilites and exposure time CDF, which are required by various regulatory agencies for risk and pe rformance assessment calculations. The dependence of the various stati stics on elapsed travel time, location in space, the dimension of the detection volume, natural variability and pore-scale dispersion is inv estigated and discussed.