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JD-9 Mine Report <br />Geoscience Services <br />Moisture characteristic curves for similar porous media found in the shales and <br />sandstones of the site, adapted from a publication by Blumb, Murphy, and Everett (1992), <br />were used to simulate unsaturated moisture conditions. The curves for the unsaturated <br />hydraulic conductivity as a function of moisture content were developed using the <br />methodology presented by Van Genuchten (1978). These functional relationships were <br />used to simulate the transport of water and subsequent contamination in the unsaturated <br />zone above the regional aquifer. <br />For the source term, it was assumed that the pore water in the waste rock <br />maintained a constant concentration for the duration of the simulation. The contaminant <br />concentrations were assumed to be at a value equal to the SPLP results. Since rainwater <br />exhibits a higher pH value (less acidic than SPLP leaching fluid} and would leach less <br />constituents of concern, the waste rock pore-water contaminant concentrations would <br />decline with time. Consequently, the source term used in the model is highly conservative <br />and over predicts the amount of contamination available for transport. <br />Tablet Hydraulic properties for relevant geologic units <br /> Hydraulic Conductivity <br />(cm/s) Storativity <br />Entrada Sandstone 1.9E-5 to 6.5E-5 SE-5 to 7E-5 <br />Morrison Formation Not available SE-5 <br />Sandstone lE-4 TO lE-8 Not available <br />Shale lE-7 TO 1E-11 Not available <br />(1) Reference values are from (Lohman, 1965) <br />(2) Reference values are from (Freeze and Cherry, 1970) <br />8 <br />