Pit & Quarry, August 2018
DUST CONTROL Seeking clarity on CRYSTALLINE SILICA the new oSHa rule blurs the compliance line for a number of industry companies by JOE MCCARTHY 28 PIT QUARRY August 2018 pitandquarry com ISTOCK COM gObalInK he Occupational Safety Health Administrations OSHA new rule on respirable crystalline silica went into effect for general industry and maritime on June 23 The OSHA standard establishes an eight hour time weighted average permissible exposure limit PEL of 50 micrograms of silica per cu meter of air μg m3 and an action level of 25 μg m3 The current Mine Safety Health Administration MSHA PEL is 100 μg m3 Respirable crystalline silica particles are at least 100 times smaller than ordinary sand you might find on a beach and theyre created when cutting sawing grinding drilling and crushing stone rock concrete brick block and mortar Activities such as cutting or crushing stone result in employee exposure to respirable crystalline silica dust Now that OSHA produced a new standard aggregate producers face questions and uncertainty regarding what regulation if any will come down from MSHA Should producers expect a carbon copy of the OSHA standard Will MSHA adapt the OSHA standard Will MSHA even develop a new standard Whether or not a new MSHA standard comes to be some industry companies T
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