Laserfiche WebLink
Storm runoff from several small areas at the mine site are treated <br />alternatively prior to leaving the permit area. Those areas include the <br />"material storage area below Pond C; the pump station; the topsoil <br />stockpile near the Gob pile; the coverfill stockpile and coverfill topsoil <br />stockpile near the Gob pile; the area around the mine engineer's building; <br />the Freeman Gulch, Terror Creek and Hubbard Creek vent sites; the area <br />underneath the conveyor, between old State Highway 133 and the Fire <br />mountain Canal; and nine small areas along the train loadout railroad track <br />outslopes. In addition, alternate sediment control measures are employed <br />at several methane de -gas drill pads. <br />2. The Division granted an exemption from the use of sediment ponds for <br />drainage from underground mine workings as long as no mixing with <br />surface drainage will occur and as long as ponds and treatment facilities <br />are not necessary for the drainage to meet effluent limitations of Rule <br />4.05.2 and applicable State and Federal water quality standards for <br />receiving streams (4.05.2(3)(b)(ii)). <br />B. Diversions and Conveyance of Overland Flow <br />1. The Division does not propose to approve a permanent diversion <br />(4.05.3(2)). <br />2. The Division approved construction of a diversion on an existing landslide <br />(4.05.3(4)). <br />C. Stream Channel Diversions <br />1. The Division does not propose to approve the diversion of an ephemeral <br />stream draining at least one (1) square mile, an intermittent or a perennial <br />stream (4.05.4(1) and (4)). <br />1 Channel lining structures, retention basins, and artificial channel <br />roughness structures are proposed for use to control erosion. These means <br />were approved by the Division, since they are necessary to control <br />erosion, they are stable and will require infrequent maintenance <br />(4.05.4(2)(a)). <br />D. Sediment Ponds <br />The Division approved alternative design criteria or specifications for use in <br />sediment pond design and /or construction. The gob pile pond (Pond D) has an <br />embankment with slopes steeper than typical requirements. Bowie Resources, <br />LLC provided the required geotechnical stability analyses to justify the <br />implementation of steeper embankment slopes. Sediment pond design details are <br />22 <br />