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• o Guard House and Employee Parking Area <br />o Fuel Tanks <br />o Rock Dust Storage and Feed System <br />o Explosives Bunker <br />All of these structures and facilities were designed and constructed, and <br />are utilized and maintained, to serve specific needs and minimize <br />potential environmental damage and safety hazards. On completion of all <br />mining related operations, physical structures will be salvaged or <br />demolished. Demolition debris will be placed in designated disposal sites <br />in the portal face-up or reclaim tunnel areas, covered, and the disposal <br />areas reclaimed. Disturbed areas will be regraded, ripped as necessary <br />to alleviate compaction, topsoil will be replaced, and the areas will be <br />revegetated as described in Section 2.05.4, Reclamation Plan. <br />Descriptions of structures and facilities listed above are presented in <br />• the following sections. <br />Mine Portals. Dorchester constructed the Southfield Mine portals in 1918. <br />Portal development involved excavation of amine face-up area on the east <br />hillslope adjacent to Magpie Creek, placement of excavated material in <br />adjacent low-lying areas to create a relatively level mine yard area, <br />construction of portal structures, and development of five (5) parallel <br />mine entries at the Red Arrow Coal outcrop. Portal structures include <br />concrete foundations or slabs with structural steel support members to <br />provide ground control and protect men and equipment. The five (5) mine <br />entries, as illustrated by Figure 18, Mine Portals are utilized for intake <br />and return ventilation air, movement of men, materials and supplies into <br />the mine, and belt haulage of coal from the mine. Ground control in the <br />main entries consists of roof bolts and wire mesh or structural steel <br />supports where appropriate. <br />Entries Nos. 1 and 4, shown on Figure 18, Mine Portals, are utilized as <br />• returns for ventilation discharge from the mine, are connected to mine <br />ventilation fans. Entries Nos. 2 and 5 are fresh air intakes for the mine <br />2.05.3-19 <br />