September 28, 1977
||JACK D. TORREY|
Acting Regional Administrator Region VIII
||DONALD E. MACKENZIE|
||RICHARD P. WILSON|
Deputy Director, Federal Compliance and State Programs
||Interpretation of 29 CFR 1926.800(c)(2)(vi) line 5 "shall be withdrawn".|
If 1.5 percent or higher concentration of flammable gas is detected in air returning from an underground working place, the employees shall be withdrawn from the tunnel and away from the portal. The power shall be cut off to the portion of the area endangered by such flammable gas until the concentration of such gas is reduced to 1 percent or less.