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PDFWAC 296-52-67235

Firing the blast.

(1) Employee evacuation. The blaster must make sure all employees are out of the blast area before firing a blast.
(2) Guarding entrances. All entrances:
(a) Leading into the blasting area must be carefully guarded.
(b) To any working place where a drift, raise, or other opening is about to hole through must be carefully guarded.
(3) Warning signals. A warning must be given before firing an underground blast. See Table T-1 for signaling requirements.
warning signal
A 1 minute series of long blasts 5 minutes prior to blast signal.
blast signal
A series of short blasts 1 minute prior to the shot.
all clear signal
A prolonged blast following the inspection of the blast.
[Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-03-125, ยง 296-52-67235, filed 1/23/02, effective 3/1/02.]
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