The four stages
- Preliminary check: the analyst reviews the site condition, plan of work and readiness for clearance.
- Thorough visual inspection inside the enclosure: the work area and relevant items are inspected for visible debris and cleanliness.
- Clearance air monitoring: air testing is carried out under the prescribed conditions and assessed against the clearance indicator.
- Final assessment after enclosure dismantling: the area is checked after the enclosure has been removed.
If a stage is not satisfactory, the process stops and the issue must be addressed before clearance continues. Air testing alone is not a substitute for the other stages.
Information the analyst needs
The analyst should receive the plan of work, site layout, scope of removal, relevant changes and access arrangements. The removal contractor must present the work area ready for independent assessment. Responsibilities and the programme should be clear before the work begins.
Arrange independent four-stage clearance
Include the site, enclosure, removal contractor, work scope and expected completion date.
The resulting evidence
After all stages pass, the analyst can complete the certificate for reoccupation for the defined area. Records should allow the work, enclosure, stages, air-test results and analyst to be traced. This evidence does not extend to unrelated parts of the premises.
Check what your project requires
If the removal method or clearance requirement is uncertain, provide the plan of work for review by an appropriate provider.
Frequently asked questions
What are the four stages of asbestos clearance?
A preliminary check, thorough visual inspection inside the enclosure, clearance air monitoring and a final assessment after enclosure dismantling.
Can air testing alone provide clearance?
No. For four-stage clearance, all required stages must be completed satisfactorily.
What happens if a stage fails?
The issue must be rectified and the relevant assessment repeated before the process can continue.
Is the analyst independent from the removal contractor?
The analyst organisation undertaking clearance should be independent from the licensed removal contractor.