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are listed along with their size , references to the appropriate design <br /> calculations and the methods of alternative sediment control proposed to be <br /> utilized. Findings relevant to these exemptions are found in Section B. II . , <br /> Part A, of this document. <br /> Mine Water Discharge <br /> In addition to water discharged from sediment ponds , water is discharged <br /> from underground workings at three locations. All waters discharged from <br /> either sediment ponds or underground workings pass to the Colorado River <br /> after treatment. For additional information on these discharges , see <br /> Section B. II . , Discharge from Processing Plant. <br /> Reclamation Plan <br /> Within one year of permanent cessation of mining operations , reclamation of <br /> the site will begin. Reclamation begins with removal of all structures and <br /> facilities , sealing of underground openings and monitoring wells . Disturbed <br /> areas are then backfilled , refuse disposal areas covered, and final grade is <br /> achieved . Topsoil will be redistributed on most areas , and all areas will be <br /> seeded and mulched. Roads are removed when no longer needed for reclamation <br /> activities . Details of the reclamation plan are included in Section 2.04.4 of <br /> the approved permit application package. <br /> All structures will be dismantled and removed from the site. Mine entries and <br /> ventilation shafts will be sealed with a double row of concrete blocks and ten <br /> feet of non-combustible material , or simply backfilled with 25 feet of <br /> non-combustible material . Drill holes and monitoring wells will be filled <br /> with drill hole cuttings or sealant and plugged with cement. <br /> Disturbed areas will be backfilled to approximate original contour, and final <br /> graded with slopes averaging 3h: ly. There are no plans for retention of <br /> highwalls . Coal processing waste may be used as backfill material to achieve <br /> approximate original contour at the Cameo Mine portal , as sufficient material <br /> is otherwise not available . Prior to backfilling the portal with refuse , <br /> Powderhorn Coal Company will submit a revised reclamation plan which would <br /> include a discussion of possible effects of backfilling with the material . <br /> This requirement has been attached to the permit previously as Stipulation <br /> No. 1 . <br /> The Roadside and CRDA Nos . 1 , 2 and 3 refuse areas will be monitored for seeps <br /> for one year following placement of final lifts . If no seeps are detected , <br /> reclamation will begin. If seeps are detected in a refuse pile , that pile <br /> will be allowed to dewater for two years before reclamation activities <br /> commence. Refuse areas will be compacted and graded to final contour and <br /> covered with the required four feet of non-toxic , non-combustible material . <br /> This cover depth includes topsoil . The required amount of cover may be <br /> decreased pending the outcome of field trials currently in progress on the <br /> Roadside refuse pile. Details of the field trial can be found in <br /> Section B. VIII . of this document. Additional information on the coal <br /> processing waste embankments can be found in Section B.VI . of this document. <br /> This study will be completed during the summer of 1993 . DMG will make a <br /> determination of acceptable cover depth during the fall of 1993. <br /> _11 _ <br />