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Mined Land Reclamatio <br />Re: Castle Concrete (any <br />Pikeview Quarry X77-211 <br />• check dams as each drainage enters the mining area (Ref: Exhibit E-2). This <br />will reduce the velocity considerably and create a sheet flow across parts of <br />the mined area. In addition, construction of contour ditches and small water <br />catchments will further control runoff and reduce erosion (Ref: Exhibit F-1). <br />The runoff entering, together with that runoff falling directly upon the <br />mined area will travel Easterly acorss the mine to the settling pond located on <br />the access parcel East of the mining operation. Total estimated runoff entering <br />the settling pond from the area above the mine and the mine itself is 48 CFS. <br />This coincides with the Douglas Creek Drainage Study approved by the City of <br />Colorado Springs. <br />The North Drainage consists of a contributing area of approximately 165 acres <br />with a peak runoff of 40 CFS entering the mining area near the Northwest corner <br />of the mine boundary. This runoff will continue to be routed through the mining <br />area close to its natural alignment. The flow will he controlled by installation <br />of grade control structures (check dams) at approximately 200 foot intervals <br />located as required in the channel (Ref: Er.hibit G-2 and F-1). The ultimate use <br />of the Eastern portion of this mine is planned to be industrial in nature. With <br />• the probable fire storage requirements, afire water retention facility may he <br />built on the channel to provide water storage as well as silt collection and peak <br />runoff control. The estimated peak runoff from this intermittent stream entering <br />the existing silt retention pond East of the mining area is 45 CFS. <br />The existing silt retention pond has been upgraded from an old stock pond to <br />its present condition, The storage depth is in excess of 10 feet over a service <br />area of approximately 1.5 acres. This storage is in addition to the silt storage <br />capacity of the pond. The facility is constructed to allow silt removal as the <br />need arises. There is also an adequate spillway facility along the North side of <br />the pond. It is estimated that 7.5 acre feet of water would reach the retention <br />pond during a 50-year storm. The 15 acre feet of storage would be more than <br />adequate to retain the entire runoff from the mining area. No runoff from the <br />mine will affect any surface or groundwater system. <br />B. See attached Exhibits concerning surface runoff. <br />• C. The water requirements for this mining operation are as follows. The <br />development phase has required virtually no water. The mining phase requires <br />P-G-2 <br />