8.15. A graded approach should be taken in responding to unexpected results. The response may vary from no action at all to increased sampling frequency for identifying, and/or confirming, spatial and temporal trends, through to changes in design or procedures, all the way to significant remedial action or even retrieval of emplaced waste. Emphasis should be placed on identifying trends rather than assigning too much significance to individual measurements. Actions such as retrieval of waste should be undertaken only after very careful study and justification, including consideration of risks associated with the remedial action. A decision to retrieve the waste should be made dependent on the timely availability of appropriate facilities and infrastructure for handling, processing and storing the waste and, if the waste is to be relocated, on the availability of a suitable disposal site.