GRADES OF RELEASE

Factors taken into account during the Area Classification process include Grades of Release which are defined as follows :-

Continuous - a release which is either continuous or is expected to occur for long periods.

Primary - a release which can be expected to occur periodically or occasionally during normal operation.

Secondary - a release which is not expected to occur in normal operation and if it does occur it is likely to do so infrequently and for short periods.