Residue
Residue means the hazardous material remaining in a packaging, including a tank car, after its contents have been unloaded to the maximum extent practicable and before the packaging is either refilled or cleaned of hazardous material and purged to remove any hazardous vapors.
Source
49 CFR § 1580.3
Scoping language
In addition to the terms in 1500.3, 1500.5, and 1503.202 of subchapter A and 1570.3 of subchapter D of this chapter, the following terms apply to this part: