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II I IIIIII I IIIIII III Doc Date:12/11/2001 <br />sss <br /> <br />• <br />ENVIROCON, INC. <br />395 WEST IRONWOOD DRIVE <br />SOUTH SALT LAKE CITY, UTAH 84115 <br />TELEPHONE: (BOt) 4859565 <br />FAX: (801) 4851M4 <br />ENC'rIROCON, INC. <br />• <br />• <br />August 31, 1994 <br />Mrs. Kathy Welt <br />Mountain Coal Company <br />West Elk Mine <br />P. O. Box 591 <br />Somerset Co 84134 <br />ENV # 1430.30040 <br />R.E: LONE PINE MINE DEVELOPMENT WASTE PILE DESIGN <br />Dear Kathy: <br />The following letter summarizes the design of the Lone Pine mine <br />development waste pile. The design follows the guidelines set forth in the <br />Regulations of the Colorado Mined Land Reclamation Board for Coal Mining. <br />• Topsoil Stripping: <br />The azea for the mine development waste pile will be stripped of topsoil <br />approximately 1 foot deep and will be placed in the Lone Pine topsoil pile previously <br />provided and approved on a sepazate application. <br />• Stability Analysis: <br />The mine development waste pile was designed to have a factor of safety <br />greater than 1.50. The mine development waste pile is approximately 0.70 acres. The <br />pile was designed to store 17,000 cubic yards. The following paragraphs describe the <br />slope stability analysis. <br />A slope stability analysis was performed on a profile depicted on drawing LPG <br />-103F. The slope stability analysis utilized the PCSTABL5 program to determine the <br />factors of safety against failure. The factor of safety is the ratio of the forces resisting <br />the slope movement to the forces which cause the slope to fail. The resisting forces <br />aze determined by the shear strength of the native soils to resist failure along a <br />specific surface. <br />A7~Compsny <br />1t~3 <br />0~ <br />