Cleanup, Clearance, and Post-Abatement Verification
Domain focus
The exam tests final cleaning, visual inspection, clearance air sampling, and reoccupancy.
Core rules
- Final cleaning uses HEPA vacuums and wet wiping on all surfaces, including plastic, ledges, and equipment. Remove visible debris and dust before sampling.
- The competent person performs a visual inspection; all ACM must be removed and the containment must be clean. Clearance sampling follows cleaning, not before.
- AHERA-style clearance uses aggressive air sampling and PCM analysis; a common criterion is less than 0.01 f/cc. Some states or projects use different methods or limits, so follow the project specification.
- If clearance fails, reclean, re-establish containment if needed, and resample. Do not reoccupy until clearance and visual inspection pass.
- Retain records: waste manifests, sampling results, notifications, and inspection logs.
Worked example
Three clearance samples read 0.006, 0.008, and 0.012 f/cc. Because one result exceeds 0.01 f/cc, the clearance fails. The contractor must reclean the space, verify visual cleanliness, and resample. Reoccupancy before the resample would be premature.
Traps
Sampling before cleaning wastes money. Non-aggressive sampling may miss settled fibers. Do not use a visual inspection alone when clearance sampling is required. Do not accept a laboratory result without chain-of-custody and accreditation.