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~•. <br /> <br />-26- <br />C~ <br />standard in Rule 4.U~. the Division is not yrantiny a variance from any <br />Performance StanrJard of Rule 4. The operator will still be responsible <br />fur meeting all applicaole effluent limitations and receiving stream <br />standards for all mine disc ha ryes. In the unlikely event that future <br />discharyes would not meet these standards, the operator would he liable <br />to redesign the system to meet the standards. <br />XIX. Explosives - Rules "L.U5.3(6) and 4.08 <br />Information regarding explosives and the blastiny plan is found Tab. 12, <br />Volume I4. <br />The applicant has submitted a blastiny plan detailing the types and <br />approximate amounts of explosives to be used, control of maximum peak <br />particle velocity, the blasting v+arning and site access control <br />procedure, and the unavoidable hazardous conditions for which deviations <br />for the blasting schedule o-+ill be neederi. The applicant has submitted a <br />plan for recording the required information fur each blast. A copy of <br />the blasting schedule is published annually in the San f~liguel Basin Forurn. <br />XX. 8ackfillinq and Grading -Rules 2.U5.3(u)(b), 2.05.4(2)(9 <br />The backfilling and grading" information can be found in Tab. 13, Volume <br />of the application. Problems identified during the review were related <br />to verification of the proposed sv+ell factor and the final configuration <br />of backfilled areas. <br />Peabody Coal Co~ipany has verified the anticipated swell factor usiny an <br />aerophotoyra~wnerric comparison whir.h was marJe of previously mined areas <br />within the Nucl~ mine. The applicant states that pre-mining and <br />post-mining cro<.s-sections have been plotted and volwnes of overburden <br />calculated usinc tl~e "average end area" method. This information is <br />presented in Appendix 12-3 with maps. <br />Utilizing a swell factor of 25% for the cverburden, Peabody Coal Company <br />has projected a post-mining topoyraphic confiyuration For the Nucla <br />Strip. Assuming the removal of an average 8 feet of coal from the Dakota <br />Coal seams, the resultant overall overburden bulking amounts to an <br />averaye of 7% wish a maximum of 14%. The corresponding post-mining <br />topoyraphic rise should averaye 3.9 feet with a maximum of 12.7 feet. <br />Redistribution o' overburden due to inherent down slope migration duriny <br />dragiine placement of overburden, and redistribution during final <br />regaadiny, result in an acceptable final topographic confiyuration. The <br />only remaining a ncern regards the implications of possible consolidation <br />settlement of the final cut's backfill adjoininy the hiyh+vall of the <br />pit. The applicant should anticipate this problem by over-fi Ming, in <br />