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Allyn Davit Mine Safety and Healtb Admini.rhation Ortolnr 1Q 2003 Page 3 • Complete geotechnical stability evaluations for designed refuse pile configuration • Prepare, submit, and obtain approvals for required project permits CDMG Technical Revision UP Raikoad Pipeline Crossing Permit and Lease For Facilities within Railroad ROW MSHA notifications • Clear and grub large vegetation and salvage available soil and suitable material and remaining vegetation, as well as lazge rocks, from road, ditch, sedimentation pond, and initial pile footprint areas • Establish road access to and within the refuse pile area • Establish upgradient clean-water diversion(s) to intercept and route undisturbed drainage around the refuse pile azea • Construct designed concrete pond embankment and discharge structures • Constmct perimeter collection ditch(s) and excavate sedimentation pond basin to collect and control disturbed area drainage and sediment from the refuse pile area • Constmct initial section of underdtain using salvaged rock materials or select granular material and appropriate fiber fabric • Selectively place and compact coal mine refuse materials in successive horizontal lifts (maximum 2-foot thick, compacted to 90 percent of maximum dry density) consistent wi[h design specifications and to the design elevation for each bench (successive benches to be constructed in the same manner) • Grade bench outslope and surface to final configuration (maximum 2H:1 V slopes, note that reclamation will be ongoing with progressive redamation of each fill bench as it is completed) • Place a minimum of 4 feet of suitable (non-toxic, non-combustible) cover material on the regraded surfaces and seed to establish permanent vegetation MSHA Compliance and Jurisdictional Considerations The proposed II West Coal Refuse Facility and associated Sedimentation Pond E aze located at an elevation of approximately 6,200', compazed with a portal elevation of approximately 6,310' for the Elk Creek Mine (the closest mine portals). The proposed facilities are at a level which is stratigraphically below the minable coal seams in the azea. They aze also approximately 3,520' from the closest mine portals, 4,550' from the closest mine ventilation shafts, and 2,850' from the closest mine surface facilities and tipple, as shown on the General Location Map (Figure 1). The proposed coal refuse facili[y and sedimentation pond do not overlie abandoned mine workings, steamlines, coal seams, or coal seam burn areas. These facilities would be accessed through the OMLLC Surface Facilities area, which is posted, limiting access to authorized persons.