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iii iiiiiiiiiiiuiii • 999 EXHIBIT D • MINING PLAN INTRODUCTION The general location of the permit area is approximately 4.5 miles southeast of the town of Hayden, Colorado. More specifically, the permit area is 0.5 miles south of the Public Service Company of Colorado Hayden Station Power Plant and borders County Road 51 B. The Mesa Pit is accessed either from the north via Highway 40, then south on Routt County Road (RCR) 27 (Twentymile Road) and then west on RCR 51B to the site entrance; or from the south via RCR 27 and then west on SCC's Tie-Across Haul Road to the new site access road (Exhibit D-1). Gravel from the Mesa Pit is used for road and facility area base and surfacing material at SCC's active operations. The Phase II expansion is necessary to provide gravel to meet continuing road maintenance requirements for SCC's Seneca II-W Mine, Yoast Mine, and • Tie-Across Haul Road. Exhibit D, Mining Plan, describes all aspects of the mining operation. Exhibit E describes the reclamation of the gravel pit. Discussed in this section (Exhibit D) are the topsoil salvaging and stockpiling procedures, the overburden handling operation, the gravel extraction, and the backfilling and grading operations. Also discussed in this section are the facilities, i.e. utility lines, office, and impoundments. Refer to Exhibit D-1, Mining Plan, for the locations of these facilities. FACILITIES Power Lines. Seven sets of high tension power lines run in a north-south direction through the Permit Area. Four of the sets are suspended by steel towers, the other three by H-frame wooden poles. SCC has agreed to a "no disturbance" boundary of 80 radial feet around the steel frame and 50 radial feet around the wooden frame structures as per instructions from Western Area Power Administration (see Appendix D-1). In addition, excavated slopes will be no steeper than 1:1 outward from the undisturbed boundary. • Even though no mining will be conducted around the D-1 Revised May 1998