Abatement Work Practices, Safety, and Compliance
Core work practices
Missouri's rule and NESHAP require asbestos to be removed using wet methods, HEPA vacuuming, and work practices that prevent visible emissions. Dry sweeping, compressed air, and dropping or throwing debris are prohibited. Before demolition, RACM must be removed. On pipes, glove bags or enclosed glove boxes are common; on large areas, build critical barriers, seal openings and HVAC, and maintain a negative-pressure enclosure with HEPA filtration. Monitor the enclosure with a manometer and keep it under negative pressure.
Worker protection
OSHA 29 CFR 1926.1101 sets the 8-hour TWA PEL at 0.1 f/cc and a 30-minute excursion limit of 1 f/cc. Use the required respirator, fit-test annually, and complete medical surveillance and training. Wear disposable coveralls, boots, and gloves; do not take contaminated clothing home. Decontaminate in a clean/dirty room sequence before leaving the regulated area.
Waste and clearance
Wet debris, bag it, and seal it in leak-tight, labeled containers. Store waste in a controlled area and send it to a landfill permitted to accept asbestos. Do not reoccupy the area until visual inspection is clean and, where required, air clearance sampling passes. AHERA-style clearance is often 0.01 f/cc, but confirm the project specification or local rule.
Worked example
A crew removes 400 square feet of asbestos floor tile and mastic in an occupied hospital. Because the tile is nonfriable, a simple wet-removal and HEPA vacuum may seem enough, but grinding or sanding can make it RACM. The crew seals the doorway, uses negative pressure, wets the tile, removes it without breaking, HEPA vacuums, seals waste, and decontaminates. They do not use a shop vacuum or dry scrape.
Traps
Do not confuse OSHA exposure limits with NESHAP emission limits. A half-mask respirator is not automatically adequate; use the assigned protection factor and fit test. Do not leave waste unlabeled or reoccupy after a visual pass alone when clearance sampling is required.