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• shown on Drawing 95266-04. It should extend from the ditch outlet, past the toe of the <br />embankment slope approximately 2 feet. <br />Filter material required for the runoff control ditches can be replaced by a non-woven <br />geofabric where ditch grades are 2 to 3 percent. Geofabric is not recommended for side <br />ditches on steep grades. The geofabric should be durable and puncture resistant for placing <br />large diameter riprap. It is suggested that the minimum weight be 12 to 14 ounce per square <br />yard, with an apparent opening size (AOS) no larger than 0.1 millimeter to provide proper filter <br />properties. <br />4.1.5 Material Balance/Materiel Stockpiles <br />A material balance was performed to calculate the quantities of topsoil and cover material that <br />will need to be stockpiled from excavations at the site to place four feet of cover for <br />reclamation, as required by Rule 4.10.4(5). The majority of material to be stockpiled will <br />come from the excavation of the central ridge and the excavation at the toe of fill material. <br />The initial central ridge excavation will require the stockpiling of approximately 2,021 cubic <br />yards (cy). This material can be placed in the cover fill stockpile area shown on the drawings. <br />Cutting existing fill material from the toe area will require space for storage of 19,000 cy, <br />within the cover fill stockpile. Additional cutting for the sediment pond, and ditches and initial <br />haul road will bring the storage of the cover fill stockpile to a maximum of 27,745 cy. The <br />initial excavations will prepare the site for construction to the EI. 6,035 ft bench. When the <br />waste bank reaches this elevation, excavation of the central ridge will continue, with the <br />resulting material being placed immediately on the waste bank face for reclamation. Topsoil <br />then is taken from the topsoil stockpile to be placed on the cover fill. The waste bank then <br />is constructed to the bench at EI. 6,085 ft, while the stripped topsoil is stored in the topsoil <br />stockpile as the crest is raised. When the waste reaches EI. 6,085 ft, the remaining central <br />ridge will be excavated and material placed on the exposed coal waste between EI. 6,035 ft <br />and EI. 6,085 ft for reclamation. Any makeup cover fill needed to place the full four feet of <br />cover over the waste will be obtained from the cover fill stockpile. Topsoil for the slope will <br />be obtained from the topsoil stockpile. Above the EI. 6,085 ft bench, the waste bank will be <br />reclaimed upon reaching the EI. 6,135 ft bench and the crest at EI. 6,190 ft using topsoil and <br />cover fill obtained from the stockpiles. Quantities remaining in the stockpiles after the crest <br />has been reclaimed will be used for haul road reclamation. <br />• <br />9626611424.RPT Coal Mine Weste Benk Finel Design for the Bowie No. 2 Mine <br />June 1996 W E S T E C weQV~cx-ot 12 <br />