An independent tester measures the residue first. Decontamination follows a written scope, room by room. Then the independent tester retests against the Australian guideline level before the site goes back into use.
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The scope
The scope is written from the first test report. It lists each room, the surfaces, what's cleaned and what's removed, so the retest can be checked against it.
Every meth job
Who does what
How we do it
First test
An independent tester or occupational hygienist takes surface samples and sends them to a lab. The results show which rooms are over the guideline level and by how much. That report sets the scope: which rooms, which surfaces and what has to come out.
Decontamination
Residue sits on every surface the smoke or vapour reached: ceilings, walls, light fittings, vent grilles and joinery. Each one is washed down, high to low, with full PPE. Carpet, curtains and other soft materials that hold residue are usually removed, and waste is bagged and sealed on site.
Retest
Once the clean is done, the independent tester samples the same rooms again. If a room is still over the guideline, it's cleaned again and retested. Both reports sit with our visit record, so the before and after are on paper.
In and out
Time-stamped on arrival and when the visit closes.
Ticked
Each area marked done against the scope you signed off.
Photographed
The areas that matter, finished. Faults flagged with a photo.
Questions
An independent tester or occupational hygienist, not us. They test before the work to set the scope, and after it to check the result against the guideline. Keeping testing separate from cleaning means the work isn't marked by the people who did it.
The Australian national remediation guidelines set 0.5 micrograms per 100 square centimetres for residential surfaces, with a higher level for commercial and industrial sites. The tester tells you which level applies and which rooms are over it.
Former labs are a bigger job. In South Australia, the local council's environmental health officer can be involved under the Public Health Act, and assessment and remediation follow a staged process. An independent consultant leads it, and the decontamination is done to their plan.
Often, yes. Carpet, underlay, curtains and fabric furniture hold residue and are hard to clean below the guideline. The test results and the scope say what's removed. Hard surfaces are washed and stay.
When the retest passes. The clean is scheduled room by room in the scope, and the lab turnaround on the retest adds some time. The independent report is what says the site is ready, not the cleaner.
The first test report is enough to scope from. If you don't have one yet, start with an independent tester, then we'll write the scope from their results.