Four Stage Air Clearance Testing Process

The four stages in the air clearance testing  process are as follows:

Stage 1: Preliminary check of site condition and job completeness

Initially, the analyst needs to establish with the contractor the scope of the work that has been carried out. This must be done by examining the plan of work & be kept at the premises until the work is completed.  The plan of work should be brought to the attention of anyone carrying out the four-stage certification procedure. It should be clear from the plan of work:

  • Where the asbestos to be removed was;
  • If any asbestos materials were to remain in situ; and
  • What the asbestos materials removed were.

Stage 2: Thorough visual inspection

This is the stage at which the thorough visual inspection of the enclosure or work area takes place. It is the most significant part of the clearance procedure. The analyst must check:

  • The completeness of the removal of the ACMs from the underlying surfaces;
  • For the presence of any visible asbestos debris left inside the enclosure and airlocks or work area; and
  • For the presence of fine settled dust.

Stage 3: Clearance indicator air sampling for the certificate of reoccupation

Air sampling takes place once a thorough visual inspection has been carried out and the analyst is satisfied that all the asbestos in the plan of work has been removed.

Stage 4: Final assessment post-enclosure/work area dismantling

Once the enclosure (or work area) has passed the visual inspection (Stage 2) and air monitoring (Stage 3), the enclosure can be dismantled.

Under normal circumstances, the analyst would remain on site during the dismantling (unless the deconstruction is not to take place for some time). Reassurance sampling would be carried out during the dismantling procedure to check for any release of airborne asbestos.

After the enclosure has been removed, the analyst will visually inspect the area to ensure that it is clean. At this stage the analyst is looking for obvious asbestos debris such as from the sheeting of the enclosure as it was dismantled or from debris which has been missed during cleaning. The analyst should also re-inspect the waste route and transit route for asbestos debris.

If any stage of the process is failed, remedial works must be undertaken to rectify the issues before the test can be repeated.

Once all stages are passed, our analyst will complete and issue the certificate of re-occupation detailing any remedial actions carried out.

You must retain a copy of this Certificate in your records for a minimum of 40 years.

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