S-2.1, r. 4 - Safety Code for the construction industry

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4.4.1.1. A construction site chest used as an explosive depot may not contain more than 227 kg of explosives.
The chest may be kept without dike. However, it must be kept at least 15 m from any building, meeting place or road.
If there is more than one chest, each chest must be protected from the others by dikes and comply with the standards prescribed in column 3 of Schedule 2.3.
O.C. 57-2015, s. 27.