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• (ii) Adequate temporary support on not more than 5-foot centers <br />shall be set at the edge of the fall where work is to be <br />started. A minimum of four posts or jacks shall be used. <br />(iii) Temporary support mentioned above shall be replaced by <br />permanent supports (roof bolts and/or posts) and advanced <br />as cleanup work progresses. <br />(iv) Bolting or timbering shall proceed from permanently <br />supported roof to the temporary supports before other work <br />is performed, and roof supports shall be advanced as the <br />cleanup work progresses. <br />(v) Where necessary to load material before support can be set, <br />such loading shall be done from under areas of permanently <br />supported roof at all times. <br />(vi) Where feasible, permanent supports shall be placed in the <br />entire fall area before loading•starts. <br />(b) All roof falls and other areas in the active workings where <br />the mine roof material has been removed from its natural <br />location by any means and is not being cleaned up shall be <br />posted off at each entrance to the area by at least two rows of <br />posts (or the equivalent) installed on not more than 5-fcot <br />centers across the opening. <br />• 17. Permanent roof supports shall not be recovered unless the <br />operator has included a detailed system for such recovery in the <br />approved roof control plan. <br />18. Devices such as round washers, angle washers, or slotted wood <br />wedges, shall be used to compensate for the angle when roof <br />bolts are installed at angles greater than 10° from the <br />perpendicular to the roof line. <br />19. All roof bolt materials shall be stored and handled in such a <br />manner that will minimize rusting and/or damaging. <br />20. The following additional safety precautions will be followed <br />when using resin grouted rods: <br />a. Persons responsible for installation of resin<_ shall be <br />instructed in safe handling precautions for such materials. <br />b. The relationship between the hale dimensions, rod size, and <br />the size and number of resin cartridges is critical; <br />therefore, adequate training and supervision shall be <br />provided to assure proper installation. <br />c. Drill steel shall be equivalent in length to the rods used <br />ar adequately marked to assure the proper hole depth. Each <br />• drill hole shall be filled with the equivalent length of <br />resin, which should provide full encapsulation of the rebar <br />rod. <br />-7- <br />