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Subchapter 7. General Industry Safety Orders
Group 18. Explosives and Pyrotechnics
Article 116. Handling and Use of Explosives--Blasting Operations

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§5307. Blasting in Excavation Work Under Compressed Air.

(a) Detonators and explosives shall not be stored or kept in caissons. Detonators and explosives for each round shall be taken directly from the magazines to the blasting zone and immediately loaded. Detonators and explosives left over after loading a round shall be removed from the working chamber before the connecting wires are connected up.

(b) When detonators or explosives are brought into an air lock, no employee except the licensed blaster, lock tender and the employees necessary for carrying, shall be permitted to enter the air lock. No other material, supplies, or equipment shall be locked through with the explosives.

(c) Detonators and explosives shall be taken separately into pressure working chambers.

(d) The licensed blaster shall be responsible for the receipt, unloading, storage, and on-site transportation of explosives and detonators.

(e) The explosives suitable for use in wet holes shall be water-resistant and shall be Fume Class I.

(f) All metal pipes, rails, air locks and steel tunnel lining shall be electrically bonded together and grounded at or near the portal or shaft, and such pipes and rails shall be cross-bonded together at not less than 1,000-foot intervals throughout the length of the tunnel. In addition, each low-air supply pipe shall be grounded at its delivery end.


Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New section filed 7-11-2003; operative 8-10-2003 (Register 2003, No. 28).

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