Laserfiche WebLink
Table 3 — Small Area Exemptions (SAES) <br />Name or location of <br />Disturbed <br />Sediment control <br />Comment <br />SAE <br />area <br />Wise Hill No. 4 and <br />0.19 acres <br />5 Wells <br />and 0.31 <br />Vegetative filter <br />acres <br />Utah Tract <br />15.56 <br />Perimeter diversion <br />acres <br />ditch and stock pond <br />B. Stream Channel Diversions <br />Exhibit 2 in the permit application contains the description and design drawings of <br />rock vanes installed on the edge of the channel of the Williams Fork River for <br />erosion control. The Division approved the design in technical revision TR -31 <br />after making the specific approvals required by Section 4.05.4. These approvals <br />are: the vanes were necessary to control erosion, they would be stable and require <br />infrequent maintenance, and they would establish or restore the channel to <br />approximate its natural meandering pattern with a geomorphically acceptable <br />gradient. <br />C. Sediment control <br />Information on the sediment control system is presented in Section 4.05 and in <br />Exhibit 18 of the permit application. Permit Map 26 shows the location of the <br />components of the sediment control system. <br />All surface disturbance run -off at the Williams Fork Mines, other than from those <br />areas discussed above, is routed to sediment ponds designed to treat the water for <br />suspended solids. Runoff from the surface disturbance areas is routed to sediment <br />ponds by a series of diversion ditches. All undisturbed drainage, where practical, is <br />routed by collection ditches around the disturbed areas and discharges directly to <br />the natural surface water system. Therefore, the amount of runoff water needed to <br />be treated by the sediment pond is minimized. <br />D. Surface and Ground Water Monitoring <br />The permittee will monitor ground water and surface water in a manner approved <br />by the Division. The monitoring plans are set forth in Exhibit 29 of the permit <br />application. The Division has reviewed the ground and surface water monitoring <br />plans and found them adequate for identifying any impacts that develop. The <br />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 <br />the operator is actively mining. The operator may follow a reduced monitoring <br />plan (Exhibit 29, Appendix D) that the Division has approved for implementation <br />while the mine is in temporary cessation. <br />Williams Fork Mines 21 Permit Renewal 06 <br />C- 1981 -044 December 8, 2014 <br />