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• water. The mine will supply bottled water for drinking purposes. A septic system will be installed in <br />accordance with state and county requirements near the mine offices and dry change facilities. <br />The main building, which includes the maintenance shop, warehouse, mine offices, and dry change <br />facilities will be heated using propane; the propane tank will be located near the building. The water <br />treatment trailer will be equipped with an electrical heater for use during the colder months. A portable <br />propane heating system may also be used at the Packrat maintenance shop during the winter. <br />15. Solid Waste Storage <br />A roll off container for disposal of trash will be located next to the maintenance shop and warehouse. <br />A second roll off may be located on top of the Whirlwind pad near the storage area and smaller trash <br />barrels will be located in the shop areas. Any trash receptacles used to contain lunch-room wastes will <br />be stored in fenced areas to preclude access by bears and other wildlife. The trash will be picked up on <br />a routine basis by a service company and disposed of at an approved landfill. No landfills will be <br />• constructed on site. Scrap metal will be stored in a bin and/or on pallets near the shop until it can be <br />picked up for recycling. Used batteries and tires will be stored in the same area and will be picked up <br />and recycled by vendors. <br />16. Ventilation Shafts <br />The existing 10-Straight Vent Shaft that accesses the southern portion of the Packrat Mine will be <br />rehabilitated and used for ventilation purposes. As the mine expands, one additional ventilation shaft in <br />Colorado and six ventilation shafts in Utah will be added as shown on Map C-1B for a total of eight <br />ventilation shafts. The location of these vent shafts may change by several hundred feet depending on <br />the ultimate location of the drift and ventilation needs. The ventilation shafts will typically be 72 <br />inches in diameter and cased. The steel casing will be grouted where it passes through aquifers to <br />prevent intermixing of waters between formations. <br />A concrete pad up to 200 square feet in size and a thickness of 6" will be constructed at each new vent <br />• shaft to provide a level platform for drilling equipment during installation. Prior to installation of the <br />Whirlwind Mine 07 (rev. April 08) D-26 <br />