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-50- should limit flyrock generation and blast loading will be limited to less than 440 pounds per 8 second delay. Vibrational analyses completed on the subject property have determined that this loading will limit peak particle velocities at the location of the critical storage facilities to less than 0.52 inches per second. The electrical substation and the ti9,000 volt electrical powerline have been relocated, as depicted on Map TR-2a of the technical revision of Permit 79-177. The Division finds that the blasting plans within the Foidel Creek permit application conform with the requirements of Rules 2.05.3(b) and 4.08. XV. Backfilling and Grading - Rules 2.05.3(6)(b), 2.05.3(9 The proposed Foidel Creek underground mine portals will be faced-up from an existing surface mine pit highwall. The applicant proposes to reconfigure the existing highwall and the existing backfilled spoil slopes which comprise the opposite face of the existing surface pit. Exhibit 8 of the permit application presents thorough and prudent state-of-the-art stability analyses of an earlier, more extensive proposed reconfiguration for the surface facility area. The conclusions of this analysis are applicable to the amended, less extensive reconfiguration of the mine portal area depicted on Maps No. 3b and No. llb. The reader is referred to Section XXI of this document for a more detailed discussion of these geotechnical issues. Following cessation of underground mining within the Foidel Creek mine, the applicant proposes to backfill the existing surface pit portal facility area. Previously mined spoils existing within areas adjoining the surface facility area will be used to completely backfill the existing pit to the approximate original contour. No acid or toxic forming materials have been encountered within the proposed permit area. Thus no special handling is required. The applicant has requested a delay of contemporaneous reclamation within the surface pit area to facilitate the construction of the proposed Foidel Creek portals and the supporting surface facilities. The reader is referred to Section XXI of this document for a more detailed discussion of the delay of contemporaneous reclamation variance request. The applicant proposes to dispose of underground development waste removed from the Foidel Creek Mine's underground workings in an area near the southwestern terminus of the existing Energy No. 1 Mine's surface pit. The underground development waste will be deposited above the observed static water table (6825 ft. above sea level). Upon the cessation of mining at the Foide] Creek underground mine, the entire underground development waste disposal area will be backfilled to final post-mining topography with overburden spoil from adjacent previously-mined areas. The Division finds that the proposed underground development waste disposal plan presented within the permit application is in conformance with Rule 2.U6.3(6)(b) and 4.09.