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• 4. The initial start-up for each operating season will be done with <br />only CO and oxygen monitoring personnel in that portion of the <br />mine ventilated by that split of air. At least 4 hours of <br />monitoring every 30 minutes shall elapse, with the CO content <br />never exceeding 30 ppm and no oxygen deficiency detected, before <br />other personnel are permitted to enter that part of the mine. <br />5. The air will be sampled every 30 minutes for another 20 hours <br />for CO level and oxygen deficiency. <br />6. If after monitoring for 24 hours the CO concentration at no time <br />exceeds 30 ppm and no oxygen deficiency is detected, the CO <br />content will be monitored at least every 4 hours while the <br />heater is operating and men are in the mine. <br />7. A log will be kept of all required CO and oxygen checks. <br />8. If after the first 24 hours the CO.level at any time reaches 50 <br />ppm, CMH&S will be notified immediately and the heater removed <br />from service. <br />9. When restarting the heater during the operating season, checks <br />for CO wi 11 be made hourly for the first four hours following <br />the restart. If the mine is idle, the four hourly checks may be <br />. made the first four hours the mine is back to work. <br />10. The CO does not need to be monitored when the mine is idle. It <br />is to be checked during the preshift examination following an <br />idle shift. <br />11. Continuous monitors may be used. If hooked to an alarm, they <br />can be used for any of the above mentioned checks. Continuous <br />monitors will be checked daily when the mine is operating. A <br />log shall be. kept at the monitor of the inspection of the <br />continuous monitor. <br />K. AUXILARY FANS <br />1. Fans shall be examined once every four hours for proper <br />operation and recirculation. The examiner shall place his <br />initials, date, and time in a book provided on the fan. The <br />examiner shall be provided with appropriate equipment to <br />properly check for recirculation and air quantity. <br />2. Fans shall be installed in the return air current from the place <br />to be ventilated by the fan, and the volume of intake air <br />delivered to the working place prior to the fan being started <br />shall be greater than the volume of air the fan will produce in <br />• the current set-up. <br />-7- <br />