A professional who performs any combination of following duties in concrete mixing plant. Respnsibilities include:

• Verifies amount of aggregate in storage bins by visual inspection, and turns swivel head to direct aggregate into specified bin.
• Tends electrically powered conveyor or pneumatic pump to hoist cement from feeder hopper, railroad car, or transport truck into storage container, such as cement silo.
• Loosens locking pin, using hammer, to dump cement from cars into storage hopper, prodding cement with pole through trapdoor in car until car is empty.
• Positions trucks, cars, or buckets under spouts of concrete mixers, batching plants, or hoppers, using hand signals, and moving levers or handwheels to discharge concrete into trucks, cars, or buckets.
• May haul cement from storage in bulk or bags, emptying, cleaning, and bundling empty bags.
• May be designated according to duties performed as Aggregate-Conveyor Operator; Bag Shaker; Cement-Car Dumper; Cement-Conveyor Operator; Cement Handler; Cement-Sack Breaker.
• May be designated: concrete-bucket loader; concrete-bucket unloader; concrete-conveyor operator; concrete-hopper operator; concrete-mixer loader, truck mounted; conveyor tender, concrete-mixing plant; dumper, central-concrete-mixing plant; loft worker, concrete-mixing plant.