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PDFWAC 296-52-67105

Firing the blast.

(1) A code of blasting signals, equivalent to Table T-1, must be posted in one or more conspicuous places at the blast area and all employees must familiarize themselves with the code of blasting signals and use it. Warning signs must be placed at suitable locations, see WAC 296-52-67075(1), Warning signs.
(2) All charges must be covered with blasting mats or other protective material before firing, where blasting may cause injury or damage by flying rock or debris.
(3) Before a blast is fired, the blaster in charge must give a loud warning signal after they have verified all surplus explosives are in a safe place and all employees, vehicles, and equipment are at a safe distance or under sufficient cover.
(4) Flaggers must be safely stationed on highways that pass through the danger zone, to stop traffic during blasting operations on highways that pass.
(5) The blaster in charge must set the time of the blast and conduct all blasting operations so no shots will be fired without their approval.
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 296-52-67105, filed 1/23/02, effective 3/1/02.]
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