Asbestos Clearance

Asbestos Clearance


#Buildings or workplaces that have had asbestos removed by licensed asbestos removalists must be assessed or cleared to determine if they are safe for re-occupation. Asbestos Clearance inspections should be conducted by a licensed and independent assessor. Environmental Consulting has a team of experienced licensed asbestos assessors in New Zealand who are fully trained in four-stage asbestos clearance processes which includes air monitoring and surface testing in line with the asbestos regulations.

Stage 1: Preliminary check of site condition and job completeness

Our analyst will establish the scope of work and ascertain whether it has been carried out accordingly. They will also check the site files to ensure all associated information is present and up to date.

Once complete they will then conduct a visual assessment of the site to check that the removal enclosure is intact, that the site decontamination unit is operational and the work area, transit and waste routes are free from unnecessary clutter and any obvious contamination that has arisen as a result of the removal work.

Once we are happy these conditions are met and that we can begin an inspection of the work enclosure we sign off and move onto stage two.

Stage 2: A thorough visual inspection inside the enclosure/work area

Initially, the analyst will inspect the removal area to check for any residual material or fallen debris, but all areas of the enclosure, including the airlocks and baglocks, are debris and dust free.

Microscopic asbestos contamination is easily spread within the enclosure during the removal process so it is important to inspect all surfaces within the work area to ensure they have been suitably cleaned.

Once deemed clean to a suitable standard, the analyst can move onto stage three, otherwise the licensed contractor may be required to continue cleaning.

Stage 3: Air monitoring

Testing and analysis for asbestos fibres (including asbestiform fibres that fit the respirable criteria) is then carried out. The work enclosure is brushed at the start of the sample run to disturb any unseen fine settled dust that is likely to contain asbestos fibres. Such dust could give rise to high levels of exposure during the dismantling of the enclosure or subsequent cleaning/maintenance activities in the work area.

Samples are collected on filters which are removed from the enclosure and counted on-site using PCM (Phase Contrast Microscopy). Should the air tests be assessed as suitably clean, stage 3 can be signed of ready for the dismantling of the removal enclosure.

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

This is a ‘backstop’ to check for any materials released as the enclosure is taken down. It’s possible they were trapped within the folds of the enclosure material for example.

The analyst will check the more general work for any residual problems, including a revisit of the transit and waste routes.

Minor issues can normally be cleaned easily before the fourth stage is completed, but in extreme (and very rare) cases, the enclosure may need to be reinstated and the work redone.

Once all four stages are complete, and only after the fourth stage is signed off, a certificate of reoccupation is issued.

Our extensive experience in the asbestos industry allows us to create a bespoke service from the initial sampling process to large scale asbestos removal projects.

We owe this level of quality to our employees who have in-depth knowledge & experience. We have the knowledge and skills to lead your project to a successful completion.

For more information from the Worksafe website click here

For more information call a member of our team on 09 930 8331

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