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1 <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br />t <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br />T830161 <br />be ancillary to routine mine operations. The anticipated composition of the waste <br />material is: <br />50% Raw Shale Fines <br />38% Gypsum (CaSO4.2HzO) <br />10% Flyash <br />2% Unreacted Lime <br />This material will be trucked from the plant site in a relatively dry state (15% moisture) <br />at an estimated rate of approximately SO to 70 tons per day. <br />The initial waste disposal area will be located as shown in Figure D.1 along the eastern <br />edge of the quarry. The waste stowage chamber will be excavated with mine equipment <br />and the excavated shale shall material will be used as feedstock for the processing <br />plant. Since the chamber is excavated in the impervious Pierre Shale Formation, all <br />leachates will be contained. In addition, the wastes will be capped with compacted <br />shale finf:s at 4- to 5-foot vertical increments to minimize percolation of water down <br />into the material as well as to cover the material on a weekly basis to protect it from <br />being wind blown. <br />Figure D.5 presents a cross section of the initial disposal site. As stated above, the <br />bottom and sides of the chambers are undisturbed impervious shale. Waste material is <br />deposited in the chamber by dump truck and spread to a uniform depth of 4 to 5 feet. <br />Then, on a weekly basis a capping layer of shale fines is placed over the material to <br />protect the material from the wind and provide intermediate percolation seals over the <br />material. Weekly capping will result in an exposed area of never more than 60 feet by <br />60 feet of uncovered waste material. Dust emissions from exposed material will be <br />controlled by watering as needed until the capping layer is emplaced. As shown in <br />Figure D.S, the chamber is filled in horizontal increments and as the fill reaches its <br />ultimate depth, an impervious sloping cap will be emplaced prior to covering with <br />overburden and topsoil. <br />-9- <br />