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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 permit application. <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 <br />entry will be collapsed with explosives. An adequate demonstration that sufficient <br />quantities of fill material exist on site to complete both portal and mine bench backfilling <br />activities is presented. <br />A single drill hole currently exists at the mine site in Hay Gulch and is used as a water <br />well. The landowner has requested that this well remain open following permanent <br />cessation of operation. The Division previously agreed with this request and hereby <br />reaffirms this previous approval. Therefore, the drill hole is not required to be sealed. <br />(4.07). <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 operation will not result in the production of excess spoil. The <br />requirements of this section are not applicable, except as they relate to the construction of <br />coal mine waste banks (4.10). <br />VIII. Coal Mine Waste Banks — Rule 4.10 <br />A. The Division has approved plans for use, construction and maintenance of a coal <br />mine waste disposal area. (4.10.1(1)). Details concerning the construction and <br />reclamation of the disposal area (refuse pile) can be found in Section 2.05.4 and <br />Appendix 10(1) of the King I volume of the permit application. The coal mine waste <br />will be underground mine waste rock extracted over the combined life of the King I <br />and King II Mines. The material is composed of dense, medium grained sandstone <br />with occasional shale and carbonaceous shale partings. <br />The valley fill waste pile is located east of the King I Mine entrance, beginning just <br />east of the shop building and extending up the east side drainage approximately 900 <br />feet. A limit equilibrium static analysis was performed using effective stresses to <br />assure long term stability of the bank. A relatively flat 2.5h : Iv slope is used for the <br />face of the waste pile. This analysis provided a range of factors of safety between <br />1.85 and 2.74, well above the required 1.5. An intercept channel was constructed at <br />20 <br />