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The coal refuse is not expected to contain material that will cause water seeping through the waste <br /> to become toxic or acid in nature. For this reason, coal waste and mine development waste can be <br /> disposed of together (Rule 4.09.1(12)) and certain requirements regarding coal processing waste <br /> banks are not applicable. No treatment of this runoff other than for sediment is anticipated. No <br /> sub-drain system will be provided to prevent the surface water or seepage from entering the <br /> groundwater system. However, the embankment drainage will be monitored and appropriate <br /> measures taken if the water does become toxic or acid. Monitoring will include the sampling of <br /> sediment pond discharges (see Hydrology section). If the water does become acid or toxic, the <br /> ponds, ditches, and disposal areas will be lined with impervious material and the drainage treated. <br /> Coal waste banks already constructed will be modified as directed by the appropriate regulatory <br /> agency. <br /> The material will be placed and compacted in a maximum of 24-inch lifts. The material will be <br /> placed to minimize ponding of surface water on or behind the waste bank. Runoff will be picked up <br /> in the diversion ditches located along the toe of the refuse bank where it intersects the original <br /> ground. As the refuse bank grows higher, the edges will be sloped back at target of 4(h):1(v) or <br /> flatter but with limited areas constructed at up to 3(h):1(v) to provide positive slope stability and <br /> minimize slope erosion. <br /> Access will be maintained to sedimentation ponds and ditches for periodic inspection and cleaning <br /> as warranted. <br /> Once a sub-area is declared properly reclaimed, the sedimentation ponds, temporary ditches, and <br /> access road will be reclaimed and the permanent diversion ditches will be extended into the natural <br /> drainage channels. The reclaimed surface slopes will minimize ponding even if some settlement <br /> should occur. Some surface retention of precipitation is intended through surface roughening to <br /> improve revegetation success and minimize sediment generation. Such surface retention will not <br /> adversely affect stability. The reclamation of sub-areas 1, 2/3/4, and 5a are shown on Maps 77, <br /> 77A, 150, and 165. The reclamation of sub-area RP-A is shown on Map 162. <br /> More refuse storage area has been provided than is estimated to be necessary. This excess area <br /> will be used if refuse volumes are greater than anticipated or the amount of coal eventually mined is <br /> greater than now expected. <br /> The bank and pond designs for only the first five sub-areas are presented in this application. <br /> Designs for the other areas will be prepared and submitted for DRMS's approval prior to the <br /> opening of these areas. <br /> TR-74 (4/2022) IV-2 3 <br />