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JD-6 Mine Report Geoscience Services that underlie the mine and control the transport of water and constituents of concern. Consequently, these properties were estimated based on available data sources of tests conducted in the specific geologic formation, regazdless of the locations, or hydraulic properties were estimated based on lithology. Table 2 provides a list of hydraulic properties available for the geologic formations underlying the mine site. There is a limited amount of information that requires estimates for these properties in the groundwater flow and transport model. ~ Moisture characteristic curves for similar porous media found in the shales and ~ sandstones of the site, adapted from a publication by Blumb, Murphy, and Everett (1992), ~ were used to simulate unsaturated moisture conditions. The curves for the unsaturated ~ hydraulic conductivity as a function of moisture content were developed using the methodology presented by Van Genuchten (1978). These functional relationships were • used to simulate the transport of water and subsequent contamination in the unsaturated ~ zone above the regional aquifer. s • For the source term, it was assumed that the pore water in the waste rock maintained a constant concentration for the duration of the simulation. The contaminant concentrations were assumed to be at a value equal to the SPLP results. Since rainwater ~ exhibits a higher pH value (less acidic than SPLP leaching fluid) and would leach less ~ constituents of concern, the waste rock pore-water contaminant concentrations would decline with time. Consequently, the source term used in the model is highly conservative • and over predicts the amount of contamination available for transport. ~ Table 3 provides sorption coefficients for the analytes of interest (units are cubic meters per kilogram). Most of the analytes are mobile but exhibit some degree of ~ sorption in sands and clays that are typical of the geologic material in the area. ~ g