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Should the Highwall Miner application prove successful at Colowyo, Colowyo has proposed • multiple applications of the system in areas surrounding both the East and West Pits (see Map 23, Mineplan). In the East Pit, all surface mining activities will be completed by year- end 2003. As currently permitted, contemporaneous reclamation activities call for the commencement of backfill and grading activities in the East Pit in compliance with the post mining topography plan. This plan will still be adhered to, but will be timed to coincide with highwall mining activities. In the East Pit, highwall mining is planned to occur in the B, C, D, and E coal seams (see Exhibit 22). Mining activities will commence on the bottom E seam, and then progress sequentially upward through the remaining seams. As a seam is mined out, the pit will be backfilled up to the floor of the next higher seam, with spoil placed by a dragline or from the truck shovel operation. The backfilling of the pit is required to attain conformance with Colowyo's permitted reclamation plan/post-mining topography, and the partially backfilled pit will also serve as a temporary level pit floor to work from to mine the next higher seam. In the West Pit, the northern highwall mining is planned to occur only in the X seam that underlies the West Pit Parking Lot Area (see Map 23, Mineplan). This area of the pit will be backfilled to the floor of the X seam, with spoil placed by a dragline or from the truck shovel operation. The western highwall mining is planned to occur in the mineable seam(s), but successful mining is dependent upon the extent of individual coal seam burn, coal seam thicknesses, and outcropping. Targeted mineable seams may include X, A, B, C, D, E, and F (see Exhibit 23). Additional exploratory drilling and evaluation will be required to more fully define the mineable seam targets in these areas. i Also in the West Pit, the southern highwall mining areas under the old Section 16 Pit may be able to mine the C, D, and E seams. Additional exploratory drilling and evaluation will also be required to more fully define the mineable seam targets in these areas. 2.06.9 Operation Conducted in Compliance with 4.23 In the conduct of performing highwall mining, Colowyo will meet all applicable requirements of the Rules, and the operation will be conducted incompliance with 4.23. 2.06.10 Coal Processing Plans and Support Facilities Not Located Within the Permit Area This Subsection does not apply to the coal mining operations planned by Colowyo. 2.06.11 In-Situ Processing Activity This Subsection is not applicable to the mining operations planned by Colowyo. • 2.06-16 Revision Date: 1 (/21/03 Revision No.: TR-58