The mine operator shall ensure that no miner is exposed to an airborne concentration of respirable crystalline silica in excess of 50 [MICRO]g/m3 for a full-shift exposure, calculated as an 8-hour TWA.
30 C.F.R. §60.10
The mine operator shall ensure that no miner is exposed to an airborne concentration of respirable crystalline silica in excess of 50 [MICRO]g/m3 for a full-shift exposure, calculated as an 8-hour TWA.
30 C.F.R. §60.10