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The sediment storage capacity of the sedimentation ponds will be monitored and modified as <br />described in the above Sediment Pond 007 subsection. The excavated material handling and <br />inspections is also described in Sediment Pond 007 subsection. <br />Pit dewatering will be primarily a seasonal occurrence. The dewatering process will be a sporadic <br />operation-controlled, occurrence depending on various factors which may include the location of <br />the pit inflows, the location of standing water in the pit, or the location within the pit of the <br />overburden and coal removal operations. When pit dewatering is required, the anticipated <br />dewatering rate will be in the range of one to two cubic feet per second or less. Until Pond 010 is <br />built, all pit dewatering discharges will be directed to Pond 007, which is the main pond for the <br />permit area. However, once Pond 010 is constructed, direct pit pumping into it may occur if <br />conditions warrant. These procedures will be applied for in WFC's NPDES Permit, which will be <br />similar to Permit CO-0000213 for Ponds 007, 008 and 009. Actual water flow velocity going into <br />Pond 010 (when built) will be controlled with adequate energy dissipators (i.e., rock riprap, <br />geotextiles, metal or concrete energy dissipator boxes, etc.) or discharged onto non-erodible <br />bedrock material. This will minimize erosion of the pond banks. <br />Pit dewatering will have an insignificant impact on Pond 010. Pit dewatering will be sporadic <br />versus continuous. The flow rate of one to two cubic feet per second or less compared to the <br />• designed 25-year, 24-hour peak inflow rate of 136.5 cubic feet per second is insignificant. In <br />addition, pit water high in suspended solids will be allowed to set for a period of time so the solids <br />are allowed to settle out of the water and will remain in the active pit area. Furthermore, all <br />discharge from Pond 010 will be in accordance with applicable discharge permits. <br />All ponds will be maintained until: <br />1) the disturbed areas are reclaimed and the vegetation success <br />requirementsofSection2.05.4(2)(e), Revegetation, are met, <br />2) the untreated drainage from the disturbed area ceases to contribute additional suspended solids <br />above natural conditions, and <br />3) the drainage leaving the pond meets applicable State and Federal water quality requirements, if <br />any, for the receiving streams. The ponds will be removed when the appropriate sections of the <br />regulations are satisfied. <br />• (Revised ~/zooa> 2.05.3(3) - 15 <br />