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V. Sealing of Drilled Holes and Underground Openings — Rule 4.07 <br />Information pertaining to the sealing of drill holes and portal and ventilation openings is <br />presented in Section 2.05.4 of the PAP. <br />All portal and ventilation entries will be permanently sealed by backfilling each opening <br />with underground development waste, common fill, and sediment from the two sediment <br />ponds for a distance of 50 feet from the entrance. Once backfilling is completed, each entry <br />will be collapsed with explosives. An adequate demonstration that sufficient quantities of <br />fill material exist on site to complete both portal and mine bench backfilling activities is <br />presented. <br />Any coal exploration drill holes, vent holes, and groundwater monitoring wells (not <br />transferred to the landowner) in the permit area will be backfilled, sealed at water bearing <br />zones, and capped with concrete plugs to meet reclamation requirements. <br />VI. Use of Explosives — Rule 4.08 <br />GCC does not store or use explosives; therefore, the requirements of this section are not <br />applicable. <br />VII. Disposal of Excess Spoil — Rule 4.09 <br />The King Coal Mine is an underground mine, and the operation will not result in the <br />production of excess spoil. The requirements of this section are not applicable (4.09). <br />VIII. Coal Mine Waste Banks —Rule 4.10 <br />A. The Division has approved plans for use, construction and maintenance of a coal mine <br />waste disposal area. Details concerning the construction of the disposal area (Refuse <br />Pile) can be found in King I Appendix 10(1) of the permit application. The coal mine <br />waste is and will continue to be underground mine waste rock extracted over the <br />combined life of the King I and King II Mines. The material is composed of dense, <br />medium grained sandstone with occasional shale and carbonaceous shale partings. A <br />limit equilibrium static analysis was performed using effective stresses to assure long <br />term stability of the bank. A relatively flat 2.5h: Iv slope is used for the face of the <br />waste pile. This analysis provided a range of factors of safety between 1.85 and 2.74, <br />21 <br />