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• Maintenance . <br />Under the terms of the present permit Coors is required to return <br />all areas of the mine to approximate original contour, topsoiled, <br />seeded and irrigated. Sediment ponds will be maintained until the <br />very end of mining, to control any runoff. No streams of any sort <br />er.ist on the property. Final reclamation and abandonment should be <br />completed by the end of the seeding season, following the completion <br />of mining. <br />Adequate Cover <br />It is not anticipated that fugitive dust will be a problem with this <br />moist material. However, if it does appear to be a problem, a daily <br />application of at least 6" of sandy clays will be bladed over the <br />exposed ash. There is an unlimited amount of this material in the <br />immediate vicinity. Assuming a delivery of 100 cubic yards/day of <br />ash placed in a five foot deep layer, 10 feet wide and 54 feet long, <br />a 6" cover will require 1UXS4X.S 10 yards of covering material. <br />27 <br />Intermediate cover is not considered necessary. <br />Final Cover/Keclamation <br />At a minimum Coors is required to replace 3 feet of topsand in all <br />• erects including the ash nits. This topsand consis*_s of eolian sands <br />with silt and organic materiai. Where will be no erosion because <br />thesa oats will be reclaimed to less than a 5~ grade. The cover <br />material will come from other parts of the mine or £rom stockpiles. <br />There is twice as much topsand presently being saved as is required <br />for 3 feet of cover. Assuming each pit will be used for six months <br />or 18,000 cubic yards 25' deep and 120' wide, the length of these <br />pits will be "LSX1`lOXL = 18,000 c.y. L = 162'. Therefore topsand <br />27 <br />requirement will be 3X120X162 2,160 cu. yds., a minor part <br />27 <br />t"t :) of the total topsand required to reclaim appror.imately 20 acres <br />every si:~ months. Disposal sites will be .no more than 1/2 acre in <br />area. <br />Activities Time Table <br />Each site will be no more than 1/2 acre. Coors estimates 2 sites <br />per year required and a mine life of 7 to 17 years for a total site <br />acreage of 7 to 17 acres. See plot map for disposal site locations. <br />• <br />-5- <br />