§ 33.241. Requirement and specifications.

 (a)  The owner, contractor or superintendent of each cavern shall provide and maintain a constant and adequate supply of pure air for each cavern as provided in this subchapter. When it becomes necessary to install means for mechanical ventilation, prior to being placed in operation, the means for providing pure air shall be approved by the Department or its authorized representative.

 (b)  The ventilating current shall be circulated throughout the entire cavern in sufficient quantities to dilute, render harmless and sweep away all smoke or noxious or dangerous gases to the extent that all working places and traveling roads shall be in a safe and fit state in which to work and travel. The minimum quantity of air thus provided shall not be less than 100 cubic feet per minute for each employe in the cavern. The Department or its authorized representative may in addition require as much more as individual cavern conditions would seem to require. If at any time it is found that the amount of air required by this section is creating a dangerous roof condition, the Department or its authorized representatives may reduce the amount of air required, but never to less than 100 cubic feet of air per minute.

 (c)  If diesel equipment is used, sufficient additional ventilation shall be used to reduce carbon monoxide content in the atmosphere to less than 0.0075% by volume. A daily record of findings shall be kept.

 (d)  A report of all carbon monoxide examinations made shall be kept in a book provided for that purpose. Each report shall be made immediately after the examination is made. Each report shall give the date and hour at which such examination was made and shall be signed by the person making the examination.