2014-10-10_REVISION - C1996083 (4)

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of the small areas to be exempted are discussed in Section 2.05 of the permit application and are shown on permit document Map 2 1 -1 and Map 95266 -02. Stormwater runoff from several small areas at the mine site are treated alternatively prior to leaving the permit area. Those areas include the material storage area below Pond C; the pump station; the topsoil stockpile near the Gob pile; the coverfill stockpile and topsoil stockpile near Gob Pile 43; the area around the mine engineer's building; the Freeman Gulch, Terror Creek and Hubbard Creek vent sites; the area underneath the conveyor, between old State Highway 133 and the Fire mountain Canal; and nine small areas along the train loadout railroad track outslopes. In addition, alternate sediment control measures are employed at several methane de -gas drill pads. (4.05.2(3)(a)) and (4.05.2(3)(b)(i)). 2. The Division granted an exemption from the use of sediment ponds for drainage from underground mine workings as long as no mixing with surface drainage will occur and as long as ponds and treatment facilities are not necessary for the drainage to meet effluent limitations of Rule 4.05.2 and applicable State and Federal water quality standards for receiving streams. BRL has obtained a discharge permit from the Colorado Department of Health and Environment, Water Quality Control Division, to discharge mine drainage water directly off site. (4.05.2(3)(b)(ii)). 3. The applicant has not proposed the use of a manual lime feeder or other neutralizing agent for the treatment of water with a pH of less than 6.0. Low pH water is not anticipated in the mine water discharge or surface water runoff (4.05.2(8)(a)). B. Diversions and Conveyance of Overland Flow 1. The Division does not propose to approve the use of an asphalt or concrete lining for a permanent diversion. (4.05.3(3)). 2. The Division does not propose to approve the construction of any diversion on an existing landslide (4.05.3(5)). C. Stream Channel Diversions 1. The Division does not propose to approve the diversion of an ephemeral stream draining at least one square mile, an intermittent, or a perennial stream. (4.05.4(1) and (4)). 2. Channel lining structures, retention basins, and artificial channel roughness structures are proposed for use to control erosion. These means are proposed to be approved by the Division since they are necessary to control erosion, they are stable and will require infrequent maintenance (4.05.4(2)(a)). 3. The Division does not propose to approve any stream channel diversion with a lesser capacity than the unmodified stream channel immediately above or below Page 33 of 46