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The Division requires each hole,well, or other underground opening be capped, sealed,backfilled or <br /> otherwise managed as per Rule 4.07.3. <br /> VI. Use of Explosives <br /> The blasting plan, as well as other items related to blasting,are discussed in permit Section 3.4,Vol. <br /> III. <br /> The Division approved blasting at times other than those described in the blasting schedule due to <br /> unavoidable hazardous situations. These situations include elimination of misfires, adverse weather, <br /> equipment failure,and safety related reasons (4. 08.3(2)(b)(v)and(4.08.4(2)). <br /> TMI proposed proposes removing a seismic monitoring unit as L-Pit continues to move away from <br /> the archeological site (5MF948) for the remainder of the mine life. Previously,TMI conducted a <br /> study of possible damage resulting from the use of explosives and proposed a monitoring/mitigation <br /> plan of archeological site 5MF948. In 2015 an Instantel Micromate Seismic Vibration monitoring <br /> unit was installed to provide monitoring at the site. To date,hundreds of seismic events have been <br /> recorded without exceeding the seismic threshold. Present operations in the L-Pit are now more than <br /> 2,400 feet from the site. TMI requested to cease seismic monitoring for this specific purpose with <br /> PR12. After analyzing TMI's data DRMS finds TMI's proposal to remove the seismic monitoring <br /> unit and end monitoring reasonable and approves of the reduction in monitoring. <br /> VII. Disposal of Excess Spoil <br /> Permit section 3. 5.3,Vol. III of the application discusses disposal of excess spoil. <br /> In accordance with TR106 and Appendix T,the K-Pit Buttress Fill is no longer required. The Horse <br /> Gulch Fill is described in Appendix T and inspected in accordance with Rule 4.09.1(11), and meets <br /> the definitions and regulations associated with valley fill and head of hollow construction. The <br /> Horse Gulch underdrain and runoff diversions were constructed in accordance with Rules 4.09.2(2), <br /> 4.09.3(1), and 4.09.2(7). The slope stability analysis for the Horse Gulch Fill demonstrates that the <br /> fill is designed to meet rules (4.09.1(7))and(4.09.2(1)). <br /> VIIL Coal Mine Waste Banks <br /> No specific approvals are granted to the applicant under this section. <br /> IX. Coal Mine Waste <br /> No specific approvals are granted to the applicant under this section. <br /> X. Backfilling and Grading <br /> Backfilling and grading are discussed under Section 3.5,Vol. III of the permit application. <br /> 1. The applicant is bonded for a maximum of four(4) spoil ridges at any time within each pit <br /> area. Reclamation has historically been, and is proposed for completion, at approximately <br /> the same rate as disturbance of any new ground(4.14.1). <br /> 2. Trapper committed to a minimum safety factor of 1.5 to ensure long term global stability in <br /> both the L and Ash Pits, exceeding the minimum requirements(4.12.2 and 4.27.3) <br /> 3. The Post Mine Topography Map (Map M12)is a permit requirement in permit section 3.5.3. <br /> 4. During PR9, TMI requested a variance for backfilling and grading portions of the L and Ash <br /> 16 <br />