1.11. The disposal of intermediate level waste in facilities, as described in Ref. [2], has to provide for long term, passive safety through a combination of natural and engineered barriers. The overall approach to monitoring in this case is similar to the monitoring system used for deep geological disposal. The similarities between the monitoring system for intermediate level waste (ILW) disposal and that for deep geological disposal are due to the fact that the waste is located at a considerable depth, and the monitoring system will reflect the combined long term effect of engineered barriers and the host rock formation.