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• 18. A suitable roof sounding device shall be provided with all mobile face <br />equipment, except haulage equipment. If face workmen who are not oper- <br />ators or helpers on such equipment do not carry a roof sounding device, <br />such device shall be available within 50 feet of their working area. <br />19. (a) Where roof falls have occurred and at all overcasts, boom holes, <br />and other construction sites that require removal of mine roof material, <br />(e.g., by blasting, by ripping with a continuous mining machine, by <br />cutting with a cutting machine, or any other means), the roof shall <br />be considered unsupported. If miners are required to enter such areas, <br />either to travel over the fallen material, to clean it up, or to perform <br />other duties, the roof shall be supported adequately. Mine management <br />shall devise and have posted in writing at the scene of such unsupported <br />roof a plan incorporating the following orocedures: <br />(i) Such work shall be under the direct and, unless the miners <br />are specially trained to do such work, constant supervision <br />of a certified person. <br />(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 sha17 proceed from permanently <br />supported roof to the temporary supports before other <br />work is performed and roof supports shall be advanced <br />as the cleanup work progresses. <br />(v) Where necessary to load material before support can be <br />set, such loading shall be done from areas of permanent <br />under supported roof at all times. <br />(vi) Where feasible, permanent supports shall be placed in <br />the entire fall area before loading starts. <br />(b) All roof falls and other areas in the active workings where the mine <br />roof material has been removed from its natural location by any means and <br />is not being cleaned up shall be posted off at each entrance to the area <br />by at least two rows of posts (or the equivalent) installed on not more <br />than 5-foot centers across the opening. <br />20. On haulageways, all crossbars or beams shall be installed with some means <br />of support that will prevent the beard or crossbar from falling in the <br />event the supporting legs are accidently dislodged. (The District Manager <br />may utilize this requirement, or waive this requirement on a mine-by-mine <br />basis.) <br />• <br />10 <br />