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All main fans shall be kept in continuous operation except in the <br /> eve nt of <br />• 1. Scheduled maintenance or adjustments on idle days when <br /> all men other than those performing ventilations or ad- <br /> justments are withdrawn from the mine and the mine power <br /> is cut off. <br /> 2. Uncontrolled stoppage or failure. <br /> 3. Other stoppages, when written permission is obtained <br /> from an authorized representative of the secretary. <br /> (See request for scheduled fan stoppage.) <br /> If an unusual variance in the mine ventilation pressure is observed, <br /> or if an electrical or mechanical deficiency of main fan is detected, <br /> the mine superintendent or mine foreman or chief mine electrician <br /> sha ll be promptly notified and appropriate action on repairs shall <br /> be promptly instituted. <br /> C. Dust Control Plan Outby Areas <br /> I. The following dust control practices shall be applied to the fol- <br /> lowing areas: <br /> Designated Location Dust Control Methane Control <br /> a. Transfer Points I: Fresh Air I. Fresh Air <br /> 2. Moisture in Coal <br /> from Miner Sprays <br /> b. Loading Points I. Fresh Air 1. Fresh Air <br /> 2. Moisture in Coal <br /> from Miner Sprays <br /> c. Underground Crushers I. Fresh Air I. Fresh Air <br /> 2. Moisture in Goal <br /> from Miner Sprays <br /> <br />-4- <br />