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Where W is the maximum weight of explosives per 8- millisecond delay in pounds <br />D is the distance in feet from the nearest structure, dwelling, church, school, public or <br />institutional building <br />Ds is the scaled distance factor (55 for distances from 301 to 5,000 feet from the blast and <br />65 beyond 5,001 feet) <br />Based on this equation and a minimum distance of structures from the blast site of 3,500 feet, the <br />maximum weight of explosives that can be detonated for any 8- millisecond delay is 4,050 pounds. <br />Explosives and primers will be stored in two separate portable magazines in accordance with <br />applicable Bureau of Alcohol Tobacco and Firearms regulations. The location of the explosive <br />storage area is shown on the Mine Facilities Map (South End), (Map 2.05.3 -M1A). <br />Overburden from excavation of the face -up area and surface facilities construction will be hauled, <br />placed, and compacted to create the mine facilities bench and coal stockpile area. Given that PSCM <br />expects to encounter some resistant rock in the portal excavation, it is anticipated that some blasting <br />will be required. It is anticipated that approximately 0.8M bank cubic yards of material will be <br />excavated and placed in the facilities bench and coal stockpile area. The portal facilities area <br />excavation with cross sections is shown on Map 2.05.3 -M6, Portal Cross Section Map. Design <br />criteria for the mine facilities bench and coal stockpile area are provided in Exhibit 2.05.3 -E4, <br />Geotechnical Design and Stability Analyses. Additional slope stability studies will be done to <br />verify that the overall slope for the multiple benches is stable and will be provided to CDRMS when <br />completed. Based on experience and testing, and as documented in the Annual Reclamation <br />Reports for overburden materials from the same geologic units in the adjacent Seneca II Mine, the <br />overburden materials excavated from the portal area and used as fill should not be potentially acid - <br />or toxic - forming materials. Essentially all the soil material and overburden removed and stockpiled <br />during construction of the portal and related surface facilities will be used to reclaim these facilities <br />when they are no longer needed to support ongoing or future mining and related operations. Given <br />this consideration, there should be no excess spoil, and the related regulatory requirements are not <br />applicable. <br />Coal Refuse and Non -Coal Processinu Wastes <br />General and detailed plans for coal refuse piles are described and referenced in full compliance with <br />applicable provisions of Rules 4.10 and 4.11. Limited volumes of underground development waste <br />will be generated from fault crossings, overcast development, material from roof falls, and possible <br />future development of ventilation shafts. To the extent practical, this material will be disposed of <br />underground in mined -out areas. Coal refuse material (development waste and non - specification <br />coal) and incombustible waste rock generated at the PSCM will be transported to the surface via <br />conveyor, segregated, and transported to Foidel Creek Mine's approved refuse disposal area for <br />permanent placement. The coal refuse and waste rock material from PSCM has been considered in <br />the design of the Foidel Creek Mine CRDA and is addressed in technical revision TR09 -67 to <br />permit #C -82 -056 for that mine. <br />Based on both experience at the Foidel Creek Mine with waste rock materials from the same geologic <br />units and sampling and analysis of those geologic materials associated with the Wadge Coal Seam in <br />the PSCM permit area (refer to the overburden suitability discussion in Section 2.04.6), the Wadge <br />TR -0/1 2.05 -32 Revision 4/12 <br />f <br />