- (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.