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• the conveyor tube will be flushed with water to remove the sediment <br />which accumulates in it. The drain pipe discharges into the upper <br />sump in the proximity of the irrigated meadow on the west side of the <br />river. Flow from this sump will be directed by gravity through a <br />15-inch diameter 3/4-round corrugated metal pipe which conveys the <br />water and sediment to a lower sump adjacent to the edge of the <br />floodplain of the Roaring Fork River. This sump will also collect the <br />washdown water from the conveyor tube on the east side of the river. <br />The sediment and washdown water in this lower sump will then be pumped <br />eastward through a line attached to the conveyor structure across the <br />river into the loadout building. From the loadout building the wash- <br />down water and sediment will be discharged into Sediment Pond 2. <br />Sediment Pond 2 is part of the facility water supply for dust <br />suppression and washdown. The system is described in the following <br />paragraph. Supporting calculations are found in Appendix 4-B. <br />• A well, situated adjacent to the Clearwater Pond, can pump, when it is <br />in priority, into the pond the volume of water needed for operation. <br />Water for washdown and dust suppression can then be pumped from the <br />pond. The washdown water is collected and pumped back to Pond 2. The <br />pond volume provides a detention time of at least 24 hours. Sediment <br />is deposited in the bottom of the pond while the water overflows into <br />the Clearwater pond. This water is then recycled for washdown and <br />dust suppression. The major losses from the operating volume are eva- <br />poration and water lost on the coal. No operating spillway is pro- <br />vided to this pond system because any storm water entering the ponds <br />can be utilized in the operating volume which will require less makeup <br />water to be pumped. An emergency overflow channel exists from the <br />clear water pond parallel to the Glenwood Ditch. This overflow chan- <br />nel discharges into an existing irrigation/storm water, concrete-lined <br />ditch which is Plumed over the Glenwood Ditch and discharges into the <br /> <br />4-136 <br />