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It is, therefore, more convenient to use a relative e. If the walkaround has not yet been completed, follow through by investigating noisy locations in person. Qualitative documentation of the presence of a contaminant on the skin is sufficient to determine whether PPE is inadequate, whether due to inappropriate selection, maintenance, or cleaning. The 8-hour TWA for OSHA's noise standard remained at 90 dBA with a 5-dBA exchange rate and included a requirement for a hearing conservation program for workers exposed to an 8-hour TWA of at least 85 dBA. The IMIS exposure records for the manufacturing industry are presented by three-digit North American Industrial Classification System NAICS codes in two tables Table II-4 and II-5 relative to the AL and PEL, respectively.