2011-06-29_PERMIT FILE - C1981019A (31)

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RULE 3 PERFORMANCE BOND 4.06 TOPSOIL The topsoil removal, storage, and redistribution plan for the proposed disturbed area associated with the Lower Wilson and South Taylor mining areas will follow the procedures described in Section 4.06 of the original permit and as described in Section 2.05.3 (5) and 2.05.4 (2) (d) of this South Taylor/Lower Wilson Permit Revision document. 4.07 SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS Drill holes and underground openings will be sealed in accordance with the procedures outlined in the previously- approved permit document. 4.08 USE OF EXPLOSIVES Explosives will be used for blasting in accordance with the procedures and specifications presented in the previously- approved permit document. Map 26A presents distances to various structures of possible concern surrounding the mining area. Only Section 4.08.2 has changed from the original permit; see the original permit for Sections 4.08.1 and 4.08.3 through 4.08.6. 4.08.2 Pre -Blast Survey In accordance with Rule 4.08.2(1), pre -blast surveys have been offered to owners of all structures within one -half mile of the permit area. Pre -blast surveys were conducted on residential structures located at 6647 and 7072 Moffat County Road 51, various associated groundwater supply wells, and eleven power pole foundations located along the ridge between Wilson and Taylor Creeks. Copies of the surveys are included in Exhibit 14, Item 4. 4.09 DISPOSAL OF EXCESS SPOIL Spoil removed from the South Taylor pit will be stockpiled in valley fill area as shown on Map 23A and Map 45. Colowyo expects a 20% swell of excavated materials; therefore, part of the material stockpiled in the East and West Taylor Fills will remain at the conclusion of the project as shown on Post Mining Topography Map 19B. Placement will occur as described in previous sections of this permit revision application and in the original permit document. Design of the two (East Taylor and West Taylor) fills associated with the South Taylor Mine plan are provided in Exhibit 21, Item 1. The East Taylor Fill will contain approximately 39 million yards of temporary out -of -pit spoil and approximately 19.8 million yards of permanent out -of -pit spoil. The West Taylor Fill will contain approximately 3.6 million yards of temporary out -of -pit spoil and approximately 27.5 million yards of permanent out -of -pit spoil. Both fills will be regraded in accordance with the approved Post Mine Topography shown on Map 19B. The final configuration of the fills is designed to minimize erosion. This takes into account a number of the components of the other fill piles at the mine which have proven successful. The final outslope will not exceed 3h:ly. Fill Name Temporary Volume Permanent Volume East Taylor Fill 39,085,227 Cubic Yards 19,828,207 Cubic Yards West Taylor Fill 3,632,635 Cubic Yards 27,565,433 Cubic Yards South Taylor /Lower Wilson — Rule 4, Page 20 Revision Date: 12/06/10 Revision No.: TR -81