Abstract
Abstract The U.S. Environmental Protection Agency's Risk Reduction Engineering Laboratory has conducted several research studies on the effectiveness of control measures for operation and maintenance activities in asbestos-contaminated buildings. Studies have been conducted on carpet cleaning, bag changing activities of portable high efficiency particulate air (HEPA) filter vacuums, and vinyl asbestos floor tile maintenance practices. In the carpet cleaning studies, hot water cleaning, HEPA vacuuming, and conventional vacuuming were compared. All three processes resulted in the release of asbestos into the surrounding environment as measured by transmission electron microscopy (TEM); however, none of the worker levels exceeded the Occupational Safety and Health Administration (OSHA) standard as measured by phase contrast microscopy (PCM). In the HEPA vacuum bag changing evaluation, all units tested exposed the worker to elevated asbestos concentrations, emphasizing the prudence of using protective clothin...
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