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JD-9 Mine Report <br />Geoscience Services <br />resources. The flow and transport model incorporated several conservative assumptions <br />regarding the hydraulic and geochemical parameters. Most conservative was the <br />assumption that the pore-water in the waste pile contained contaminant concentrations <br />that reflected SPLP test conditions. Actual rainwater exhibits a higher pH value (less <br />acidic than SPLP leaching fluids) and would ]each constituents of concern at l ower <br />concentrations. In addition, for the 1000 year simulation, concentrations of constituents <br />of concern in the waste-rock pore water were maintained at initial concentrations In <br />reality, as constituents of concern are leached from the waste rock, concentrations would <br />steadily decline with time. The net result is a model that over predicted the amount and <br />availability of constituents of concern for transport. <br />Even using such conservative assumptions, results of the modeling simulations <br />showed that no contamination reached the underlying groundwater system. Based on <br />concentrations and sorption characteristics for all of the analytes tested, none will migrate <br />through the Brushy Basin Member of the Morrison Formation. The Summerville <br />Formation provides an additional barrier preventing the constituents of concern from <br />impacting the groundwater in the underlying Entrada Sandstone. <br />In summary, mining operations at the JD-9 mine poses no significant threat to <br />underlying groundwater resources in the azea. <br />References <br />ACRi, 2000, PORFLOW Users Manual, Version 4.0, Rev. 4, Bel Air, California. <br />Blumb, A. C., C. L. Murphy, and L. G. Everett, 1992, "A Comparison of Three Functional Forms <br />for Representing Soil Moisture Characteristics," Ground Water, Vol. 30, No. 2, pp. 175- <br />185. <br />Cater, Fred W., 1954. Geologic Map of the Bull Carryon Quadrangle, Colorado. U.S. <br />Geological Survey, Washington D.C. <br />13 <br />