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Response to DRMS Adequacy Review (1) -Cotter SR -11 Mine Reclamation Plan Amendment <br />limit the mobility of any uranium - related constituents. Kearl (2005) <br />conducted numerical modeling studies of the transport of uranium - related <br />constituents from other Cotter properties with waste rock piles with similar <br />geology underlying the piles. This modeling report is provided in <br />Attachment 8 to this response. <br />Using very conservative assumptions, in a worst -case scenario, after 1000 <br />years the concentration of uranium would be 1 /1,000,000 of the initial <br />concentration at a depth of 200 feet below the pile. There is over 400 feet of <br />Brushy Basin shales, low- permeability mudstones, and shales of the Salt <br />Wash Formation and the Summerville Formation located between the base <br />of the waste pile and the top of the Entrada Sandstone. At this location, it is <br />not clear that the Entrada contains groundwater, but nevertheless, any <br />leachate from the waste pile will not reach a viable water resource. <br />8 <br />