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All three (3) coal refuse hoppers are located within the mine facilities <br />area, consequently any drainage from hopper areas is collected by existing <br />facilities area ditches and routed to Sedimentation Pond 1 for removal of <br />suspended solids. The coal refuse bins require essentially no maintenance <br />other than repair of any malfunctions of loading gates. EFCI does however <br />periodically inspect refuse bins and associated structures for evidence of <br />any damage or deterioration. As necessary, wheel loaders are also utilized <br />in refuse bin areas to clean up any spillage which may occur. <br />Because the coal refuse bins are closely associated with the preparation <br />plant and breaker installation, they will be demolished or salvaged and <br />related areas reclaimed in conjunction with reclamation of those facilities <br />as previously described. <br />Coal Refuse Permanent Stockpile. Coal preparation results in coarse and fine <br />coal refuse which are placed in a permanent stockpile located west of the <br />mine facilities area. The coal refuse materials are composed primarily of <br />sandstones, shales, and other rock or mineral components which occur as <br />inclusions or partings in the minable coal seams. Coal processing operations <br />` separate these refuse materials from the raw coal product, with refuse <br />materials transported to a permanent coal refuse pile for placement and <br />disposal. Ultimate design capacity of the refuse pile is approximately 2.6 <br />million cubic yards. During the initial stages of the mine life, Dorchester <br />contracted with Geo Testing Laboratories, Inc., a Colorado Springs based <br />geotechnical consulting firm, to develop designs and evaluate the <br />geotechnical stability of a permanent coal refuse stockpile. The resulting <br />stockpile design/evaluation was completed in January, 1981 with data and <br />conclusions presented as a report titled, "Verification of Items Contained in <br />Rules 2 and 4 in the Regulations of the Colorado Mined <br /> <br />C\TM\B6UVOLJ\OP. PLN <br />ivuvr a:nPm wPSirc~ 2.05.3-30 Revised - 12/14/94 <br />