415. Explosives located underground or on the surface shall be under the supervision of a worker designated for that purpose or stored, subject to section 416.1, the second paragraph of section 418 and section 423, in magazines that(1) are used solely for that purpose;
(2) have inside surfaces covered so that no iron or steel is exposed and that no particle of a rough body of iron, steel or a similar substance can become detached or come into contact with the explosives contained in the magazine; however, in underground explosives magazines, the metal parts required for support of the walls of an excavation may be left exposed;
(3) have a smooth and easy-to-clean floor;
(4) should there be any nitroglycerine present, have their shelves and floor treated with a neutralizing product when contaminated by explosive substances, according to the method prescribed by the manufacturer;
(5) are clearly identified by notices bearing the word “EXPLOSIFS” in letters 102 mm (4.0 in) high, placed on the 4 walls of the magazine, on the surface; underground, similar notices shall be placed approximately 20 m (65.6 ft) from both sides of the magazine;
(6) permit, where applicable, the use of forklifts and ES type transpallet trucks as defined in UL 583-1991, Standard for Electric-Battery-Powered Industrial Trucks for the handling of explosives in the magazine.
The motorized vehicles referred to in subparagraph 6 of the first paragraph(1) must not be left unattended; and
(2) must be parked outside the magazine when they are not in use.