§ 47.91. Dry grinding, sieving and packing.
(a) Exhaust system. Crushing mills, grinding mills and sieving machines, operating on material in a dry state if containing lead in excess of 10% shall be connected with an efficient air exhaust and dust collecting system, plans for which shall be submitted to and approved by the Department.
(b) Packing. Dry packing of material containing lead in excess of 10% or arsenic, shall be carried on by an approved type of packing machine. If material is packed by hand, employes shall wear approved respirators.
(c) Mixing and shading. Mixing and shading of dry materials containing lead in excess of 10% or arsenic, shall be performed in a room with mechanical exhaust ventilation, plans for which will be approved by the Department.
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