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Mine Portal Heaters - A propane portal- heater system will be installed to prevent icing and <br />improve safety on the portal entries and to heat the intake ventilation air. The heater unit(s) will be <br />located on the belt entry, as shown on Map 2.05.3 MIA, Mine Facilities Map (South End). Heat <br />from the portal- heaters will be directed into the entries by a 5 -foot diameter steel pipe through a <br />concrete bulkhead. In addition to the welded gas -line connecting the tank to the portal heater(s), a <br />2 -inch polyethylene LP line will be buried from the tank to the new bathhouse, and will include a <br />vaporizer located some 50 feet from the tank. <br />Rock Dust Tanks - Two rock dust tanks, approximately 150 tons each, located on the surface <br />facilities pad, as shown on Map 2.05.3 M1A, Mine Facilities Map (South End), will supply <br />rockdust to the underground mine through a 12.25 -inch cased borehole, approximately 125 feet <br />deep. The borehole will carry a steel pipe for the rock dust drop, and a steel conduit to supply <br />power for the tank feeder drive and top blower. The pad for each rock dust tank will consist of a <br />solid one -foot thick footer and four concrete pillars containing approximately 22 cubic yards of <br />concrete. The tank pads and associated truck access /unloading area will be surfaced with pit -run <br />gravel to control runoff and erosion. <br />Electrical Metering Station — The metering station will be located northwest of the portal area. <br />The metering station will be a pole- mounted disconnect and a system of meters on a concrete pad <br />30 x 30 feet. The station will be enclosed in a security fence with a locked gate. <br />Portal Sump Pump Station — This system incorporates a two (2) pump system on a common <br />access bridge. The bridge is a 36.5'x 36" steel structure supported by a 13' high concrete pillar. <br />Two submersible pumps will be suspended from the end of the bridge. The pumps will be rated at <br />2,000 gpm. Approximately 500' of 8" discharge pipe will be connected to the pumps. <br />Covered Storage — Four covered storage areas will be constructed for dry storage of materials. The <br />structures will be 100 x 30 x 20, two at 150 x 50 x 20 feet and one at 250 x 50 x 20 feet. The <br />structures will be steel -frame construction, with steel siding, and a dirt floor covered with 1 -foot of <br />road -base material. The steel buildings will sit on two foot diameter concrete pylons, five feet deep <br />on 25 foot centers. The locations of these structures are shown on Map 2.05.3 -MIA, Mine <br />Facilities Map (South End). <br />Water Well CCU036 — Well CCU036 is an existing borehole /water well that will be <br />developed /completed for use in the future. <br />Topsoil Stockpile - Available soil or suitable plant growth materials will be salvaged prior to <br />disturbance in the surface facilities and other mine disturbance areas and stockpiled for use in <br />reclaiming these areas. Given the limited area available for mine surface facilities, all of the <br />salvaged soil material will be placed in the topsoil stockpile, located to the southwest of PECOCO <br />Pond, as shown on the Mine Facilities Map (South End) (Map 2.05.3 -MIA). The topsoil stockpile <br />will contain approximately 140,000 cubic yards, and is located and configured to minimize erosion <br />potential and to prevent loss or degradation of the soil resource. Soil stockpile signs will be placed <br />and maintained on the soil stockpile in compliance with the applicable requirements of Rules 4.02.4 <br />and 4.02.7. The stockpile will be stabilized with a vegetative cover crop. Silt fence /wattles /ditch <br />and sump may be placed at the toe of the stockpile slope to minimize sediment, as appropriate. The <br />amount of topsoil stored is reconciled annually and reported in the Annual Reclamation Report. <br />TR -0 2.05 -16 Revision 4/12 <br />4 <br />