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RULE 4 PERFORMANCE STANDARDS <br />and West Taylor Fills will remain at the conclusion of the project as shown on Post Mining Topography Map <br />19B. Placement will occur as described in previous sections of this permit revision application and in the <br />original permit document. <br />Design of the two (East Taylor and West Taylor) fills associated with the South Taylor Mine plan are <br />provided in Exhibit 21, Item 1. The East Taylor Fill will contain approximately 22 million yards of <br />temporary out -of -pit spoil and approximately 19.8 million yards of permanent out -of -pit spoil. The West <br />Taylor Fill will contain approximately 11.9 million yards of temporary out -of -pit spoil and approximately <br />27.5 million yards of permanent out -of -pit spoil. Both fills will be regraded in accordance with the approved <br />Post Mine Topography shown on Map 19B. The final configuration of the fills is designed to minimize <br />erosion. This takes into account a number of the components of the other fill piles at the mine which have <br />proven successful. The final outslope will not exceed 3h:1 v. <br />Fill Name <br />emporary Volume <br />Permanent Volume <br />East Taylor Fill <br />22,218,118 Cubic Yards <br />19,828,207 Cubic Yards <br />West Taylor Fill <br />11,891,755 Cubic Yards <br />27,565,433 Cubic Yards <br />Designed terrace ditches will be constructed at approximately 100 foot vertical increments. Terrace Ditches <br />will be backsloped to direct runoff against the face to prevent flows from overflowing the edge of the ditch. <br />These terrace ditches will direct surface runoff perpendicular to the face into a permanent drainage channel <br />designed to pass safely the runoff from a 100 year, 24 hour precipitation event. Terrace ditches are shown on <br />Map 41 A and design information is provided in Exhibit 7, Item 20, Part G. <br />Reclamation, specifically topsoil replacement, seeding etc. will be implemented consistent with the Section <br />2.05 of the permit. <br />CONSTRUCTION PLAN <br />All available topsoil will be removed and either stockpiled for later use or direct haul replaced to a reclaimed <br />area. <br />Due to the fact that the valley fill locations are in close proximity to the initial boxcut area means the entire <br />footprint of these fills must be stripped of topsoil immediately after the approval of PR -2. As described in <br />further detail in this submittal under Section 2.05.3(1); "The entire seam sequence from the top overburden <br />through to the bottom G8 seam, which resides in the area of the initial boxcut, will be placed in the valley fill <br />locations; this will allow Colowyo enough spoil room to reach the desired mining depth." <br />It is anticipated the valley fill drains and associated lateral drains will be constructed as one project during the <br />first two years of operation in the South Taylor operation for practical purposes and as a necessary step in <br />preparation of the area for full scale mining. <br />Channels constructed along the outside of the valley fills (perimeter relief drains) will be built immediately <br />after the logical completion of each terrace ditch across the faces of the fills, which obviously cannot be <br />completed until such a time as the fills themselves develop and are constructed to meet PMT compliance. <br />This activity will be logically sequential in that they will be developed from the bottom up. <br />Colowyo will follow the Shannon & Wilson recommendation for excavation as described in Exhibit 21, Item <br />1. <br />South Taylor /Lower Wilson — Rule 4, Page 14 Revision Date: 10/31/13 <br />Revision No.: MR -129 <br />