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GeoScience Services <br />2263 Kingston Road <br />Grand Junction, CO 81503 <br />(970) 314-3356 <br />Conservative based modeling that incorporated no sorption and relatively high <br />permeability values results in plumes that failed to reach the underlying groundwater. <br />Under realistic conditions using published values of sorption and permeabilities such as <br />laboratory tests for the Summerville Formation, then there is no viable pathway for <br />species of concern from the mining waste piles to reach regional groundwater resources. <br />If you have comments or concerns regazding this report please feel free to contact me <br />anytime. <br />Sincerely, <br /> <br />Peter M. Keazl <br />GeoScience Services <br />References <br />Colorado Department of Public Health and Environment, 2000, Decision Analysis- <br />Proposed Action to Renew License at the UMETCO Uravan Facility, Colorado Specific <br />Radioactive Material License 660-02. <br />Cotter Corporation, 1978, Analytical report for water samples from the JD-9 mine. <br />Freeze, R.A., and J.A, Cherry, 1979. Groundwater. Prentice Hall, Inc. New Jersey. <br />Lohman, S. W., 1965. Geoio~ and Artesian Water Supply Grand Junction Area Colorado. <br />Geological Survey Proffesional Paper 451, Washington, D.C. <br />