5.3 The Mixture Rule
If you have a characteristic hazardous waste and it is inadvertently mixed with a nonhazardous waste, the mixture will be considered hazardous waste only if it retains the hazardous characteristic.
If you have a nonhazardous waste, e.g. used oil, and you contaminate it with a listed hazardous waste, e.g. F005 spent solvent; the entire waste will be classified as F005 listed hazardous waste.
A few wastes are listed only because they are ignitable or reactive. In these cases, if the resulting mixture is no longer ignitable or reactive, then the mixture is not considered a listed waste.