If a tank returns with more than the agreed limit of residue, then of course you are entitled to advise us that additional disposal costs will be incurred, calculated based on the amount of additional residue above the agreed limit. In such cases we must be informed as soon as the residue is observed, and we would ask you to send us an advice advising how much additional residue is estimated, as well as the disposal cost, and if possible relevant photos. We will then approach the receiver, and offer them the option of recollecting the tank and offloading the remaining product, or paying the disposal costs. We will then revert back to you to confirm their requirements, and until we do that no further action should be taken, and the residue should not be touched in case it becomes contaminated.