Laserfiche WebLink
• EXHIBIT G <br />WATER INFORMATION <br />Please refer to the original permit application as amended for background <br />hydrology information. <br />The construction activities onsite have had significant effects on <br />the surface hydrology of the area. The following discussion outlines the steps <br />which will be taken to control and to minimize inpacts on surface hydrology. <br />1. Davis Gulch <br />The construction of the Davis Gulch Dam has been postponed. <br />A spillway will be added to he existing cofferdam, which serves as a sediment <br />control structure for most of the plateau disturbance areas. <br />Permanent and interim reclamation of the areas upstream of the Davis <br />Gulch dam location have been described previously in combined Exhibits D & E. <br />These efforts are scheduled to commence in the fall of 1982. <br />2. Middle Fork <br />The existing sediment pond at the upper end of the mine bench will be <br />retained at least until upstream construction and reclamation activities are <br />completed. <br />A review of the hydrology of the Middle Fork watershed and the hydraulics <br />of the dam itself has shown that adequate flood protection for downstream areas, <br />notably the mine bench, can be achieved by construction of a dam of lesser <br />height than that originally approved. The reduced dam is currently being <br />designed and is scheduled for construction in 1983 and 1984. Since the State <br />Engineer's office has the responsibility for approving dam designs, the design <br />. information wi]1 be submitted to the State Engineer for approva] before con- <br />PD 1000.102 B8 <br />