(a) All storage of explosives shall be in approved explosives magazines located at distances from neighboring buildings and highways in conformity with the American Table of Distances for Storage of Explosives.
(b) When explosives in excess of immediate requirements are removed from a magazine and delivered in the vicinity of a blasting operation they shall be kept in a portable magazine consisting of either a stout tight box covered with not less than 24-gauge sheet iron and equipped with a hinged lid or in a small portable building similarly covered. Such portable magazine shall be painted red and conspicuously marked “Explosives — Dangerous”, in white block letters not less than 3 inches in height. Portable magazines as described in this subsection shall be locked and located as required by the Director.