Sec. 31.04. If the air at an underground working face in a mine, when tested at a point not less than 12 inches from the roof, face, or rib, contains more than 1.
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/il/chapter-225/act-705/31-04A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
Sec. 31.04. If the air at an underground working face in a mine, when tested at a point not less than 12 inches from the roof, face, or rib, contains more than 1.0% of methane as determined by permissible methane detector, a multi-gas detector, air analysis, or other recognized means of accurately detecting such gas, changes or adjustments shall be made at once in the ventilation in such a mine so that such air shall not contain more than 1.0% of methane.