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• M. ROOF BOLTING <br />1. Perceptible air movement will be provided to the working faces <br />in which roof bolting is being performed. <br />2. Ventilation devices (tubing, line curtain) shall be maintained <br />within 5 feet of the row of bolts being installed or to within <br />15 feet of the face. <br />3. Dust collection or suppression systems, installed at the head of <br />the roof bolter according to manufacturer's specifications, will <br />be used in addition to the ventilation. <br />4. When adverse top conditions are encountered where the function <br />of a dust collection or suppression system will not be <br />effective, the roof bolting operation can proceed providing that <br />6,000 cfm is maintained in the area being bolted. Men will not <br />work downwind of. the bolting operation when the dust suppression <br />systems are inoperable. <br />N. BLEEDER SYSTEMS <br />1. At least a single entry will be left along the outer edges of <br />any pillar panel to permit ventilation of the gob. <br />• 2. If a bleeder entry is expected to be in service for over one (1) <br />year, the minimum size of the pillar left to separate the <br />bleeder from the gob will be 55' x 55'. <br />3. If the bleeder entry is expected to be in use less than one (1) <br />year, the minimum size of the pillar left to separate the <br />bleeder from gob will be 35' x 55'. <br />4. All such bleeder systems shall meet or exceed the criteria <br />established in Section 15.316-2 (e) through (i), 30 CFR. <br /> <br />-g- <br />