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PDFWAC 296-52-67245

High speed tunneling: Central primer house.

The following requirements apply when primers are made up at a central primer house for use in high speed tunneling:
(1) Primers.
(a) Only enough primer must be made for each round of blasting.
(b) Primers must be placed in separate containers and bins, categorized by the degree of delay in preventing physical impact.
(2) Separation of explosives in magazines. Explosives transported in the same magazine must be separated by:
(a) One-quarter inch steel; and
(b) Covered on each side by four inches of hardwood planking or equivalent protection.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-16-132, § 296-52-67245, filed 8/1/17, effective 9/1/17. Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-03-125, § 296-52-67245, filed 1/23/02, effective 3/1/02.]
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