How can workers be protected from asbestos-contaminated vermiculite?
In general, any vermiculite that originated from the mine near Libby, Montana, should be regarded as potentially contaminated with asbestos. As with any asbestos-containing or asbestos-contaminated material, the only way to know the amount of asbestos present is to have the material tested. Bulk sampling is reliable only when over 1% of the material is asbestos. Negative results from bulk samples can therefore be falsely reassuring when less than 1% of the sample is asbestos. However, disturbing contaminated vermiculite with less than 1% asbestos can still result in hazardous concentrations of airborne asbestos fibers. NIOSH recommends workers consult Occupational Safety and Health Administration (OSHA) asbestos standards for general industry and construction (29 CFR 1910.1001 and 1926.1101) when work will involve vermiculite that is known or presumed to be contaminated with asbestos. Relevant information is posted on the OSHA web site: http://www.osha.gov/SLTC/asbestos/index.html. If
