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

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3.23.11. Upon completion of work where airtight drop sheets were used to protect the work area, drop sheets intended for re-use must be cleaned with a vacuum cleaner equipped with a high-efficiency filter. Drop sheets intended for disposal must first be wetted, then folded so that they hold all the dust that they have collected and, finally, placed in an airtight container.
O.C. 54-90, s. 3.