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TABLE 3.7-1 PORTAL CONSTRUCTION DETAILS <br />• To enhance the ease of reclamation of the concrete portals, plastic <br />pipes will be cast into the concrete at the locations shown below. <br />When reclaiming the portals, the pipes can be filled with dynamite <br />and detonated. The concrete will then break up into easily moved <br />panels that can be pushed the few feet into the mine portals for <br />disposal. Both ends of the pipes will be capped to prevent plugging. <br />In addition to the pipes going across the portals, each comer of the <br />portal will have a pipe cast into place to allow separation of the top, <br />sides, and floor of the portals. <br />• <br />8.5 f <br />• <br />10 ft <br />~-- <br />Both Sides <br />6 inches thick Top View <br />IV Il <br />Total plastic pipe installed <br />220 <br />Side View <br />feet per portal <br />Mc Vol 1 - Tbl 3.7-1 Task 20 Page 4 7 7 - 19 JB <br />