30 CFR § 57.6800
MAINTENANCE--SURFACE AND UNDERGROUND
When repair work which could produce a spark or flame is to be performed on a
(a) The explosive material shall be moved to another facility, or moved at
least 50 feet from the repair activity and monitored; and
(b) The facility shall be cleaned to prevent accidental detonation.
[58 FR 69596, Dec. 30, 1993]