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• Gradin <br />Upon completion of coal refuse placement, the top surface and sideslopes <br />of the refuse pile will be rough graded to provide for effective drainage <br />utilizing either a tracked dozer or motor grader. As noted in the <br />previous sub-section, refuse pile sideslopes will be established at a <br />maximum gradient of 2H:1V with typical sideslopes at approximately 3H:1V. <br />The upper surface of the refuse pile will slope to the east with a minimum <br />gradient of at least 0.5 percent to ensure drainage and prevent any <br />ponding of runoff on the refuse materials. <br />T~soil Replacement and Grading <br />In order to minimize the total disturbance area and control erosion and <br />sedimentation, topsoil replacement and revegetation will follow refuse <br />placement as soon as is operationally practicable. A minimum of four (4) <br />• feet of topsoil and subsoil material will be placed on regraded portions <br />of the refuse pile using tractor scrapers or a wheel loader and trucks to <br />move these materials from active removal areas or existing stockpiles to <br />replacement areas. Topsoil replacement thickness may be modified as a <br />result of the comprehensive permit revision/update currently being <br />prepared. However, any modifications are subject to CMLRD approval. <br />The topsoil will be rough graded using either a tracked dozer or motor <br />grader to maintain uniform replacement depth. Topsoil replacement will <br />typically be scheduled for late summer or early fall to coincide with <br />subsequent fall seeding. <br />Revegetation <br />Following topsoil replacement, topsoiled areas will be reseeded using the <br />revegetation seed mix presented as Table 2.05.4-3 in the permit <br />application document (Volume 6). <br />• <br />lOR Revised - February, 1990 <br />