Class 4 work is designed to regulate which activity?

• A. Disturbing TSI during demolition
• B. Custodial work around nonfriable materials
• C. Removal of ACM
• D. Construction around asbestos

Answer: (B)

Class 4 work focuses on custodial and housekeeping activities around asbestos-containing materials, aimed at preventing exposure during routine maintenance rather than during abatement. It covers tasks like cleaning and waste handling in areas with ACM, especially when the materials are nonfriable and not easily disturbed, as long as proper procedures are followed. This makes custodial work around nonfriable materials the best fit, since Class 4 is all about routine cleaning and housekeeping that could bring ACM dust into the workplace without performing removal. Disturbing thermal system insulation during demolition, removing ACM, or construction around asbestos involve abatement or more invasive work that falls under other classifications and stricter controls.