Magazine floors shall be regularly swept, kept clean, dry, free of grit, paper, empty used packages and rubbish. Brooms and other cleaning utensils shall not have any exposed spark-producing metal parts. Sweepings from the magazine floor and other rubbish shall be removed to a safe place and destroyed. Magazine floors stained with nitroglycerin shall be cleaned according to instruction by the explosives manufacturer.
Cal. Code Regs. Tit. 19, § 1567.3