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METHANE AND DUST CONTROL PRACTICES AT FACE AREAS <br />1. Line brattice and/or vent tubing used to provide ventilation to <br />the working face from which coal is cut, mined, or loaded shall <br />• be installed at a distance no greater than fifteen feet from <br />the area of deepest penetration of the face. Where roof bolt- <br />ing is performed, the ventilation device will be maintained no <br />more than five feet outby the last permanent roof support <br />installed during the previous bolting cycle. In idle or dead <br />ended entries, the ventilation device with perceptible air <br />movement will be kept to within 15 feet of the working face; <br />however, in unsupported areas, the ventilation device will be <br />kept to the last row of permanent support. Also, supply and <br />sump niches may be driven into solid coal off the return air- <br />ways for depth not to exceed 20 feet and will not be required <br />to be ventilated after completion of the bolting cycle. If <br />tubing is used, it will be extended from the face to the <br />auxiliary fan located in the crosscut. If line brattice is <br />used, it will be extended from the face to the open crosscut. <br />• 2. The minimum mean entry air <br />working faces where coal is <br />minimum quantity will be not <br />quantity of air in any wor <br />shall not be less than 6,000 <br />velocity shall be 60 fpm in all <br />being cut, mined, or loaded and <br />less than 10,000 cfm, The minimum <br />king place which is being bolted <br />cfm, <br />3. The minimum quantity of air reaching the last open crosscut in <br />any pair or set of developing entries or rooms shall be 9,000 <br />cfm and the minimum quantity of air reaching the intake end of <br />a pillar line shall be 9,000 cfm. <br />4. Methane examinations will be made at the last row of permanent <br />roof support not less than one foot from the roof. Detection <br />probes capable of extending five feet will be available for <br />extending the sampling capability closer to the working face <br />should methane liberation become a safety hazard. <br />• ~ Paye Seven <br />Revised 03/27/80 <br />Revised 04/13/81 <br />Revised 08/05/82 <br />Revised 09/09/83 <br />Revised 04/18/84 <br />Revised 06/25/84 <br />