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Yes. A cargo tank that is required to be placarded when it contains a load of hazardous material must remain placarded when it only contains residue. Placards would not be required if the tank is cleaned of residue and purged of vapors to remove any hazard OR is filled with another material to the extent that the material is no longer hazardous.
['Hazmat markings, Placards, and Labels', 'General Packaging Requirements - Hazmat']