Asbestos is present in many occupational settings. The level of precautions that need to be observed varies with the risk of exposure.
Worker selection: asbestos known or presumed to be present
Work Description
Class
work likely to aerosolize asbestos fibers (removal of thermal steam insulation containing asbestos; resurfacing or cutting asbestos containing materials)
Class I
removal of other asbestos containing materials (wallboard, floor tiles, shingles, etc)
Class II
repair and maintenance duties likely to disturb asbestos containing materials
Class III
maintenance and custodial duties unlikely to disturb asbestos or presumed asbestos containing material
Class IV
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