2012-02-28_PERMIT FILE - C2009087A (4)

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RULE 2 - PERMITS notification will be provided only to residents or owners of dwellings or structures within one -half mile of the blast area. Unavoidable hazardous conditions that could delay a scheduled blast or require an unscheduled blast include emergency situations where rain, lightning, or other atmospheric conditions or operator or public safety concerns warrant unscheduled blasting as a safety consideration. Blasting operations are conducted in accordance with the following equation which limits the maximum weight of explosives to be detonated within any 8- millisecond delay period: W = (D /Ds)2 Where W is the maximum weight of explosives per 8- millisecond delay in pounds D is the distance in feet from the nearest structure, dwelling, church, school, public or institutional building Ds is the scaled distance factor (55 for distances from 301 to 5,000 feet from the blast and 65 beyond 5,001 feet) Based on this equation and a minimum distance of structures from the blast site of 3,500 feet, the maximum weight of explosives that can be detonated for any 8- millisecond delay is 4,050 pounds. Explosives and primers will be stored in two separate portable magazines in accordance with applicable Bureau of Alcohol Tobacco and Firearms regulations. The location of the explosive storage area is shown on the Mine Facilities Map (South End), (Map 2.05.3 -MIA). Overburden from excavation of the face -up area and surface facilities construction will be hauled, placed, and compacted to create the mine facilities bench and coal stockpile area. Given that PSCM expects to encounter some resistant rock in the portal excavation, it is anticipated that some blasting will be required. It is anticipated that approximately 0.8M bank cubic yards of material will be excavated and placed in the facilities bench and coal stockpile area. The portal facilities area excavation with cross sections is shown on Map 2.05.3 -M6, Portal Cross Section Map. Design criteria for the mine facilities bench and coal stockpile area are provided in Exhibit 2.05.3 -E4, Geotechnical Design and Stability Analyses. Additional slope stability studies will be done to verify that the overall slope for the multiple benches is stable and will be provided to CDRMS when completed. Based on experience and testing, and as documented in the Annual Reclamation Reports for overburden materials from the same geologic units in the adjacent Seneca lI Mine, the overburden materials excavated from the portal area and used as fill should not be potentially acid - or toxic - forming materials. Essentially all the soil material and overburden removed and stockpiled during construction of the portal and related surface facilities will be used to reclaim these facilities when they are no longer needed to support ongoing or future mining and related operations. Given this consideration, there should be no excess spoil, and the related regulatory requirements are not applicable. TR- 01 -10. 2.05 -27 Revision 02/11