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4.11 Waste Storage <br /> A roll off container for disposal of trash is located on surface. Small trash barrels are located near <br /> the office and dry room. Trash is picked up on a routine basis by a service company and disposed <br /> of at an approved landfill. <br /> No landfills will be constructed on site. Scrap metal is stored in a bin and/or on pallets near the <br /> shop until it can be picked up for recycling. Used batteries and tires are stored in the warehouse <br /> in the town of Ouray and are picked up by a waste disposal company. <br /> Used oil, hazardous waste, aerosol cans, used lubricants,used antifreeze,paint and solvents are <br /> stored in the Waste Storage Building. Liquid wastes are stored on secondary containment and <br /> transported to the Main Warehouse for shipment offsite. <br /> 4.12 Surface Drainage Treatment and Control <br /> Surface drainage is controlled by a system of collection and diversion ditches as well as a five- <br /> stage passive mine water treatment system. The detail designs for these structures, as well as the <br /> surface water data used to design them can be found in Exhibit G and Exhibit U. <br /> Stormwater run-on is controlled by two run-on diversion ditches to prevent contact with <br /> disturbance areas. These diversion ditches are shown on Map C-IA and are called Diversion <br /> Ditch 91 and Diversion Ditch 92 (note the naming convention of these features has changed <br /> since the original permit application). Diversion Ditch 91 runs along the south side of the <br /> property and prevents stormwater from coming into contact with the Revenue TSF and the <br /> treatment pond. Diversion Ditch 92 diverts stormwater around the Atlas TSF. There also are <br /> stormwater collection ditches that collect stormwater associated with industrial activity to <br /> prevent it from discharging to surface water. Ponds that are used to control sediment are <br /> described below: <br /> 1) Sediment Pond 91 —This pond is located on the east side of the Atlas TFS,which is <br /> designed to collect rainwater and snow melt from the atlas tailings facility. <br /> 2) Proposed Sediment Pond#2 —This pond is proposed and will be constructed near the <br /> main entrance to the mine to collect stormwater runoff from the process areas and main <br /> access roads,which will be conveyed in a channel that runs along the main access road. <br /> 3) The proposed location currently serves as a stormwater collection area,but OSMI <br /> proposes to install a zero-discharge sediment control pond to contain the 10-year 24-hour <br /> storm event. The proposed pond will be an Environmental Protection Facility and has <br /> been designed by a P.E. A copy of the proposed, P.E. certified design is provided in <br /> Attachment 2 -Updated Appendix 2. Mine Water Pond 91 —this pond is designed to <br /> collect mine water from the main Revenue Portal as well as stormwater from the Revenue <br /> TSF and equipment laydown area. Stormwater collected in this pond is commingled with <br /> mine water and is treated in the five-stage passive mine water treatment system prior to <br /> discharge to Sneffels Creek via a discharge permit. <br /> Revenue Mine <br /> Amendment 02 D-23 <br /> Updated August 2022 <br />