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Mountain Coal Company West Elk Mine RPE Shafts Project Plan The two monitoring holes will be drilled using air, removing the need for a mudpit as no mud slurry will be produced. All cuttings resulting finm the drilling activities will be disposed of in the RPE ponds. The holes will be 9 5/8-inches cased and be permanent features. They will serve as standby monitoring holes and emergency injection holes for water and CO2. Sealing of these monitoring holes will not be finalized until currently on- going mine water evaluations are completed, as the monitoring holes may be utilized for mine water discharge. Concrete for the shaft collaz will likely be hauled from Paonia using State Highway 133. Current estimates are that approximately 650 cubic yards of concrete may be required for this project. Upon abandonment the shaft will be capped with concrete and steel structure below ground surface. Final seal design will be submitted prior to mine closure, as they will be designed in reference to on-going mine water discharge evaluations. Backfill material will be used to cover the cap. The shaft collar will be removetL Regrading to blend with final topography of the RPE will occur; if needed this surface will be scarified; the stored topsoil spread; and the disturbance fertilized (20-5-5, minimum N-P-K) and seeded using the CDMG reclamation seed mix. Straw mulching (certified weed-fi~ee draw) will be used as needed to facilitate reclamation SURFACE TOPOGRAPHY The surface elevation of the proposed RPE Sha$ is approximately 6,190 ft. Complete field investigations were previously completed for the development of the RPE area This information is presented in Technical Revision (TR) 90, TR-79 and Eachibit 70, Volume IOB. Background environmental information pertaining to the surface topography can be found in this document and its appendices. GEOLOGY Complete field investigations were previously completed for the development of the RPE area This information is presented in TR-90, TR-79 and Exhibit 70, Volume lOB. Background environmental information pertaining to the geology of the azea can be found in this document and its appendices. WATER RESOURCES Complete field investigations were previously completed for the development of the RPE area This information is presented in TR-90, TR-79 and Exhibit 70, Volume lOB. Background environmental information pertaining to the water resources of the area can be found in this document and its appendices. TR-105 Page 4 of 12