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6890 feet. The wastes will be placed on a two-foot compacted layer of clayey <br />overburden, and then compacted. This will minimize the water quality impact of <br />the wastes by: 1) limiting the exposure of the wastes to ground and surface waters, <br />2) preventing the washing of fines into the ground water system, and 3) limiting <br />infiltration and deep percolation within the wastes. <br />The coal processing wastes will be covered with a minimum of four feet of <br />non-toxic overburden and soils. This depth of cover should prevent toxicity to <br />plants, ensure successful revegetation, and prevent exposure of wastes to surface <br />waters. <br />The only significant change to the existing conditions at the mine since the original <br />permit was issued has been the mining of sand and gravel under a permit issued by <br />the Division under the Colorado Miried Land Reclamation Act (CRS 34-32-1O1 et <br />seq). The subsequent mining of sand and gravel at the site has increased the acreage <br />of surface disturbance by approximately 33 acres. This acreage is less than the total <br />amount proposed to be disturbed by the Carbon Junction operation at buildout. The <br />sand and gravel operations are conducted within the proposed disturbed area of the <br />coal mine and minimize impacts to the surface water regime through the use of the <br />same sediment control technology as the coal mine. Groundwater impacts from the <br />sand and gravel operation aze not anticipated as the operation is mining dry alluvial <br />terrace gravels. Therefore, the above predictions of the PHC remain valid <br />III. Sealing of Drilled Holes and Underground Ogenines <br />A. The Division will require that each hole, well or other underground opening be capped, <br />sealed, backfilled, or otherwise properly managed (4.07.3). <br />N. Disposal of Excess Spoil <br />A. The Division is proposing to approve the use of a disposal azea for excess spoil <br />(4.09.1(1)). <br />B. The Division has reviewed the design for the fill and proposes to approve it (4.09.1(2)). <br />C. The Division proposes to approve of the location of the disposal area (4.09.1(6)). <br />D. The underdrain system will be constructed simultaneously with excess spoil placement <br />by the natural segregation of dumped materials. The resulting underdrain system will <br />be capable of carrying anticipated seepage from rainfall aw well as springs and seeps <br />within the foundation of the disposal area away from the Fill. Other requirements for <br />drainage control will be met. <br />19 <br />