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Mountain Coal Company Exhibit 69 <br />West Elk Mine Sylvester Gulch Facilities <br />from a 25-year, 24-hour storm event, below the emergency spillway level. The <br />calculations are provided in Exhibit 66. The emergency spillway and subsequent <br />open channel is sized to pass the 25-year, 24-hour precipitation event in <br />accordance with Rule 4.05.6. Supporting documentation and calculations are <br />included in Exhibit 66. <br />The Storn~water Runoff Pond plan and section is included in Exhibit 66. In <br />addition, the designs for the discharge pipe emergency spillway, and emergency <br />discharge channel are provided in Exhibit 66. The Stormwater Runoff Pond will <br />require approximately two cubic yards of concrete. A six-foot high chain link <br />fence topped with three-strand barbed wire will be provided to restrict <br />unauthorized entry and wildlife access. The estimated length offence is 270 feet. <br />Reclamation <br />Map 58B and 59B illustrate the reclamation plan for the SGFA, including the <br />dewatering and treatment facilities. The area will be returned to approximate original <br />contour. Afrer regrading, topsoil will be spread, seeded, and mulched in accordance <br />with MCC's approved reclamation plan. <br />Oct, 19977RR3; Revised Mm' I99R MR243 <br />6 <br />