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RULE 2 - PERMITS <br /> Standard maintenance procedures, such as preventive maintenance programs, painting, and <br /> lubrication shall be utilized throughout the active life of all structures and facilities. All facilities will <br /> be removed,and the associated disturbance areas reclaimed to approximate original contours,and the <br /> approved postmining uses when no longer required to support ongoing or future mining and <br /> related activities. The south end surface facilities and the additional north end facilities are <br /> summarized in Table 2.05.3-T3,New Facilities Summary. <br /> Mine Ventilation System—The mine ventilation system will include two exhausting fans; one will <br /> be located at a portal entry and the other on a pad above the portal and connected to the underground <br /> workings by a shaft. The fan located at a portal entry is planned to be removed once the ventilation <br /> shaft is complete and the second ventilation fan is operable. Only one exhaust fan will be operating <br /> at a time. <br /> The fan located at a portal entry will be a temporary fan mounted on a skid and connected to the portal <br /> entry canopy. It will be a Spendrup fan model AMF2000-80-10. This fan has the capabilities of <br /> exhausting 200,000 cubic feet per minute from the mine. It will be driven by a 250 hp motor. The <br /> second ventilation fan will be a 96-inch diameter Jeffery fan Model 8HUA-96 that has the capacity <br /> to exhaust approximately 450,000 cubic feet per minute from the mine. The fan will be driven by a <br /> 1250 hp electric motor. The mine fan will be enclosed by and connect to the shaft by a steel fan <br /> shroud with explosion doors. The fan, motor, and shroud will be supported on concrete footers and <br /> pads. The fan and connecting duct work will be mounted on a concrete pad 31 x 70 x 2 feet,the fan <br /> will be installed on a pedestal 7 x 7 x 11 feet and two more pedestals measuring 16 x 2 x 6 feet for <br /> the upcast and evase,containing a total of approximately 208 cubic yards of concrete. An upcast 90- <br /> degree duct will be connected to the evase. The electrical building housing the fan motor and control <br /> equipment will be a pre-fabricated steel building set on a 20 x 20 x 2 feet pad. The motor will be <br /> mounted on a concrete pedestal 5 x 4 x 4 feet, containing approximately 5 cubic yards of <br /> concrete. The total concrete contained within the building will be approximately 50 yd3. <br /> Electrical Substation and Ground Field-The electrical substation will be located near the entrance <br /> to the mine face-up area Electric power will be provided by Yampa Valley Electric Association from <br /> an existing 69KV power line that parallels RCR27. The substation will be approximately 105 x 150 <br /> feet, and will be enclosed by a security fence with locked gate to prevent unauthorized access. The <br /> substation will contain transformers, capacitors, switch gear and control equipment. From the <br /> substation, overhead lines will distribute power to the mine surface facilities at 4,160 volts, and <br /> supported cables will transfer power to the underground operations at 12,470 volts through four fl- <br /> inch cased power boreholes, approximately 125 feet deep. <br /> An adjacent area will contain a 160'x160' buried ground field for the substation. The field consists <br /> of 68 - %" 8' long copper ground rods driven vertically into the ground forming a 160'x160' grid <br /> pattern. There is 2/0 bare copper wire interconnecting these rods in a grid. The rods are driven 10' <br /> into the ground. There is 2' of soil above the ground field and then the entire field is covered by <br /> crushed rock. <br /> Material and Coal Storage Yards — Materials such as roofbolts, conveyor structure, timber, and <br /> other consumable supplies needed for the underground operations will be stored in these areas. In <br /> addition to material storage,the area will also serve as initial coal storage area. The storage yard will <br /> cover a maximum area of approximately 4 acres, and will be surfaced with road-base or gravel. <br /> MR32-19 2.05-14 Revision 11/19 <br />