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<br />Williams Fork Mines Prepared by: R. Reilley M.S. GISP <br />C1981044 5 November 2018 <br /> <br /> <br /> 19 <br />Table 3 – Small Area Exemptions (SAEs) <br />Name or location of <br />SAE <br />Disturbed <br />area Sediment control Comment <br />stockpile <br />Overland Conveyor- < 2 acres Vegetation <br />Railroad Tracks approx. 10 <br />acres <br />Vegetation between <br />Williams Fork River <br />and tracks <br />SEDCAD analysis indicates no <br />runoff would reach the river from <br />10-year, 24-hour event. <br />Wise Hill No. 4 and <br />5 Wells <br />0.19 acres <br />and 0.31 <br />acres <br />Vegetative filter <br /> <br />Utah Tract 15.56 <br />acres <br />Perimeter diversion <br />ditch and stock pond <br /> <br /> <br />B. Stream Channel Diversions <br /> <br />Exhibit 2 in the permit application contains the description and design drawings of rock vanes <br />installed on the edge of the channel of the Williams Fork River for erosion control. The Division <br />approved the design in technical revision TR-31 after making the specific approvals required by <br />Section 4.05.4. These approvals are: the vanes were necessary to control erosion, they would be <br />stable and require infrequent maintenance, and they would establish or restore the channel to <br />approximate its natural meandering pattern with a geomorphically acceptable gradient. <br /> <br />C. Sediment control <br /> <br />Information on the sediment control system is presented in Section 4.05 and in Exhibit 18 of the <br />permit application. Permit Map 26 shows the location of the components of the sediment control <br />system. <br /> <br />All surface disturbance run-off at the Williams Fork Mines, other than from those areas <br />discussed above, is routed to sediment ponds designed to treat the water for suspended solids. <br />Runoff from the surface disturbance areas is routed to sediment ponds by a series of diversion <br />ditches. All undisturbed drainage, where practical, is routed by collection ditches around the <br />disturbed areas and discharges directly to the natural surface water system. Therefore, the <br />amount of runoff water needed to be treated by the sediment pond is minimized. <br /> <br />D. Surface and Ground Water Monitoring <br /> <br />The permittee monitors ground water and surface water as approved by the Division. <br />Monitoring plans are set forth in Exhibit 29 of the permit application. The Division reviewed the <br />ground and surface water monitoring plans and found them adequate for identifying any impacts <br />that develop. The Division has approved the following monitoring plans for ground water <br />(4.05.13(1)(a)) and surface water (4.05.13(2)(a)). These plans are followed when the operator is