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REPORT <br />PRELIt4INARY STABILITY EVALUATION <br />UPPER WASTE ROCK PILE <br />MOUNT GUNNISON COAL MINE <br />FOR ARCO COAL COMPANY <br />1.0 INTRODUCTION <br /> <br /> <br />1.1 GENERAL <br />As a part of the proposed Mt. Gunnison Coal Mine, two <br />waste rock storage areas are tentatively planned on the site. <br />The initial lower waste rock storage area is located north of <br />the proposed mine entries at the flat, lower bench at elevati <br />approximately 6,300 feet. This initial storage area will be <br />used during the first years of the mine operation. <br />During the later years another, larger waste rock storag <br />area will be established. This future upper waste rock storag <br />area will be developed south of the mine entries, on a large <br />topographical bench between elevations approximately 6,650 and <br />6,780 feet. <br />Geotechnical investigations performed by the Inter- <br />national Engineering Company, Inc. (1976), Woodward - Clyde <br />Consultants (1978), and by GEO-HYDRO Consulting, Inc. (1980) <br />indicated that landslides are present at the site. All these <br />geotechnical studies dealt with the influence of these land- <br />cEO+noao coNw~mw, iNC. <br />