The take-back obligation in paragraph 2 shall not apply if the competent authorities of dispatch, transit and destination involved in disposing of or recovering the waste are satisfied that the waste can be recovered or disposed of in an alternative way in the country of destination or elsewhere by the notifier or, if impracticable, by the competent authority of dispatch or by a natural or legal person on its behalf.
The take-back obligation in paragraph 2 shall not apply if the waste shipped has, in the course of the operation at the facility concerned, been irreversibly mixed with other waste before a competent authority concerned has become aware of the fact that the notified shipment cannot be completed as referred to in paragraph 1. Such mixture shall be recovered or disposed of in an alternative way in accordance with the first subparagraph.