8.10. After completion of the emplacement operations, but before the final closure of the disposal facility, monitoring and surveillance data should be collected to confirm the continuing performance of key safety functions as identified in the safety case, either through direct evidence (i.e. by means of a measurable parameter) or indirect evidence (i.e. by enhancing the scientific basis used to develop predictive models or through the collection of data from pilot/demonstration disposal facilities). The data obtained should be used to verify that the disposal system is functioning as expected. This means that the key components are fulfilling their functions, as identified in the safety case, or as stipulated by the regulatory body, and that actual conditions are consistent with the key assumptions made for safety after closure. For example, the data obtained may be used to help support a decision to terminate active institutional control, by verifying that the disposal system has remained in a passively safe condition for a specified period of time.