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U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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30 CFR § 57.5045
Posting of inactive workings.
Inactive workings in which radon daughter concentrations are above 1.0 WL,
shall be posted against unauthorized entry and designated by signs indicating
them as areas in which approved respirators shall be worn. For further information: See MSHA's Program Policy Manual |