30 CFR § 75.1326
Examination after blasting
July 29, 2020
(a) After blasting, the blasting area shall not be entered until it is clear of smoke and dust.
(b) Immediately after the blasting area has cleared, a qualified person or a person working in the presence of and under the direction of a qualified person, shall examine the area for misfires, methane and other hazardous conditions.
(c) If a round has partially detonated, the qualified person shall immediately leave the area and no person shall reenter the affected area for at least 5 minutes.