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<br />C. ROOF BOLTING r'~ ~"- ~ ~~ - ~ ~ • <br />I. The minimum quantity of air reaching the workiny face will~fhe16,OD0 <br />cfm. <br />2. The maximun distance the ventilation device will be maintained from <br />the working face will be no more than five feet out by the last per- <br />manent roof support installed during the previous bolting cycle. <br />3. Roof bolt machines will have a vacuum-type dust suppression system, <br />(~ <br />• <br />Initial I]/O1/B6 <br />