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• W FC's NPDES Permit CO-0000213. A new discharge point has been applied for to utilize the <br />Pond 011 site. See Attachment 2.05.3(3)-18. Actual waterflow velocity going into Pond 007 and <br />Pond 011 will be controlled with adequate energy dissipaters (i.e., rock riprap, geotextiles, metal <br />or concrete energy dissipator boxes, etc.) or discharged onto non-erodible bedrock material. <br />This will minimize erosion of the pond banks. <br />Pit dewatering will have an insignificant impact on Pond 007, as shown in Attachment 2.05.3.(3} <br />2. Pit dewatering will be sporadic versus continuous. The flow rate of one to two cubic feet per <br />second or less compared to the designed 10-year, 24-hour peak inflow rate of 123.7 cubic feet <br />per second is very insignificant. In addition, pit water high in suspended solids will be allowed <br />to set for a period of time so the solids are allowed to settle out of the water and will remain in <br />the active pit area. Only after the pit water is clear, will it be pumped from the pit into Pond 007. <br />Further more, all discharge from Pond 007 will be in accordance with applicable discharge <br />permits. <br />Pond 007 will be maintained after reclamation as requested by the landowner. The <br />demonstration that this pond retention is in compliance with Rule 4.05.9(13) is included in <br />Attachment 2.05.3(3)-16 DEMONSTRATION FOR RETENTION OF POND 007. <br />• <br />The sedimentation pond slopes will be protected from erosion where surface runoff enters the <br />pond area. <br />Monitoring for rills and gullies on the pond and other reclaimed slopes will be carried out on a <br />periodic basis; the monitoring being geared to those periods after spring snow melt and during <br />required quarterly pond inspections. <br />Occurrence of excessive rills and gullies will result in implementation of the following plan. One <br />of, or a combination of, the following options and corrective methods will be employed: <br />If it is determined that the topography of the regraded area is such that drainage is <br />concentrated in a particular area, then this area will be improved to accept the runoff. <br />In areas where no natural armoring is present, the drainage bottom or channel will be <br />reshaped, if needed. The channel bottom will either be seeded, covered with erosion <br />matting and seeded, or rocked. The method used will, of course, depend on site <br />conditions. Continued observations will be made of this area for problems or necessary <br />• maintenance. <br />(Revised July 2006) 2.05.3(3)-12 <br />