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be submitted in the Annual Reclamation Report. Should a substantial grading problem be detected, CDMG <br />shall be notified and shall be presented with a proposed remedial plan. <br />The probability of slides occurring is relatively low; however, at any time a slide occurs which results <br />from mine -related activities and which may have a potential adverse effect on public property, health, <br />safety, or the environment, Seneca Coal Company will notify CDMG of the occurrence of the slide and the <br />remedial measure proposed to be undertaken. <br />Waste materials are not used for fill. No excess spoil or waste storage areas are anticipated as a result <br />of mining at Yoast. Mining waste materials consisting of the immediate top and bottom of the coal seam, <br />and carbonaceous shales, when encountered, are buried under a minimum of four feet of non-combustible <br />material (see Tab 21, Minesoil Reconstruction). Non -coal wastes such as greases, lubricants, paints, <br />flammable liquids, garbage, lumber, and other manmade combustibles are stored in appropriate containers in <br />the vicinity of the shop building. These non -coal wastes will be disposed of off-site by a private <br />licensed contractor. <br />Postmining Topography <br />General. Backfilling and grading of mined spoil will produce a postmining topography similar to the <br />original landform. The design of the postmining landform utilizes existing data. The purpose of the <br />design is to construct a postmining landform which is adequate for defining drainage patterns and for <br />review and analysis by regulatory authorities. <br />The design requires adjusting the original landform elevations for the removed coal seam and the swell of <br />the overburden and nonrecoverable coal material. Data necessary to develop the new elevations and <br />calculate volumes are overburden and coal thickness, bottom of the mined seam, original ground surface <br />elevations, and the limits of the area to be mined. All of these data are available in a computerized <br />drill hole data base and from topographic maps. <br />volume Calculations (Premining Topography). All of the volumetric calculations used in the development of <br />the postmine topography are shown on Table 20-1, Postmining Landform Mass Balance. The volumes are broken <br />down into two areas; Area 1 is the 1995-1999 permit term mining area; Area 2 is the mining area to the <br />south (the 2000 - 2005 and 2005 + permit terms). Please refer to Exhibit 20-2, Postmining Topography for <br />the volume locations. The following methods were used in determining those volumes. <br />TR -25 3 Revised 09/04 <br />