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~• REPORT ON STABILITY ANALYSES AND RECOMMENDATIONS FOR RECLAIMID SDRFACE FACILITIES AT THE MT. GIINNLSUN NO. 1 MINE L SCOPE AND OBJECTIVE The ARCO Coe1 Company, a division of Atlantic Richfield Company, intends to build and operate a .250 million ton per year coal mine on its ML Gunnison property near Somerset, Colorado. The ARCO Coel Company is committed to the development, operation and reclamation of this mine in en environmentally sound manner. The Oifice of Surface Mining (OSM) and the Mined Land Reclamation Board require that the site be returned to its approximate original condition at the conclusion of all mining activities. It is the ARCO Coal Company's present intent that the surface facilities shall be removed or dLsposed at that time, and that the site shall be returned to its approximate original condition end approximate original contours (AOC). An investigation has been made to evaluate the procedures for reclaiming certain surface Pacilities that have been planned and that lie within an area designated for potential slide activity. It is the purpose of this report to summarize this investigation end to make recommendations for the reclamation of these and other related surface facilities at this site. (• The surface facilities that have been planned and which lie within the area .designated for ' ~ potential slide activity include a section of the main access road, the portal bench, the substation end the shop warehouse (refer to the Site Plan reference sheet). A dewatering system has been investigated and it will be installed to stabilize the sites of these planned facilities during the proposed construction and the operational life of the mine. The reclamation of these sites requires special consideration in order that these areas remain stable after the site has been returned to its approximate original condition Merrick $ Company has conducted an extensive analysis of various alternatives for reclaiming and restoring these and the related areas to ensure a stability factor of safety of 1.3 or greater. This report contains recommendations on the procedures to be followed for reclaiming those areas within the said Landslide Boundary. Our recommendations are based on the results of extensive Slope Stability Investigations. Tn addition, recommendations are included in this report Por the disposal and reclamation procedure to be followed for other related surface facilities which lie outside the Landslide Boundary. Topsoil spreading and revegetation recommendations ere beyond the scope of this report except as they apply to reclamation of the facilities within the Landslide Boundary. The reader should refer to the Mining end Reclamation Plan for further information on topsoil spreading and revegetation. (.