Abatement Work Practices and Procedures
What this domain tests
The exam tests how removal is actually performed: wet methods, fiber suppression, HEPA vacuuming, glovebags, mini-enclosures, work sequencing, tool use, and daily cleanup. Strong answers show a sequence, not just a list of controls.
Core rules and concepts
- Keep ACM wet throughout removal. Use amended water or a wetting agent where appropriate, but do not over-wet, which creates leaks, slipping hazards, and contaminated runoff.
- Use HEPA vacuums, not ordinary shop vacuums. Never dry sweep, dry scrape, or use compressed air to clean asbestos debris.
- Glovebags are used for localized pipe and fitting removal. Mini-enclosures are used where a glovebag is impractical. Larger removals require a negative-pressure containment.
- Remove material in controlled sections. Seal cut ends of pipe insulation, wrap large components before moving them, lower material carefully, and bag waste as it is generated rather than stockpiling debris.
- Use non-sparking, manually operated tools where possible; avoid power tools that pulverize material unless they are used with HEPA local exhaust and the method is approved.
- Perform daily cleanup and a final visual inspection before clearance. Clean tools and equipment before they leave the work area.
- Coordinate lockout/tagout, electrical safety, and HVAC isolation. On multi-employer sites, the controlling employer must ensure abatement boundaries are respected.
Worked example
A crew must remove 20 linear ft of friable pipe insulation in an occupied mechanical room. What is a defensible sequence?
Reasoning: isolate the area with critical barriers and shut down or protect the HVAC. Set up negative pressure and a decontamination route. Wet the insulation, use a glovebag or mini-enclosure, cut the insulation in sections, seal the ends, and place each section directly into a labeled leak-tight bag. HEPA-vacuum the pipe and surfaces, inspect the work area, then decontaminate workers and equipment. Do not dry-cut, drop debris to the floor, or carry unwrapped insulation through occupied space.
Traps that cost marks
- Dry removal because "it is only a small section."
- Over-wetting and allowing contaminated water to escape.
- Using a shop vacuum or broom for cleanup.
- Removing more material than necessary and spreading fibers.
- Leaving pipe ends unsealed or carrying large friable pieces uncovered.
- Skipping daily cleanup and relying only on final clearance.