Grind, sand, or polish, using hand tools or hand held power tools, a variety of metal, wood, stone, clay, plastic, or glass objects. Includes chippers, buffers, and finishers.

Set up, operate, or watch over machines to crush, grind, or polish materials, such as coal, glass, grain, stone, food, or rubber.

Set up, operate, or watch over continuous flow or vat type equipment; filter presses; shaker screens; centrifuges; condenser tubes; precipitating, fermenting, or evaporating tanks; scrubbing towers; or batch stills. These machines extract, sort, or separate liquids, gases, or solids from other materials to recover a refined product. Includes dairy processing equipment operators.

Operate or watch over equipment to control chemical changes or reactions in the processing of industrial or consumer products. Their equipment used includes devulcanizers, steam jacketed kettles, and reactor vessels.

Monitor and control activities associated with hydropower generation. They operate plant equipment, such as turbines, pumps, valves, gates, fans, electric control boards, and battery banks. They monitor equipment operation and performance and make necessary adjustments to ensure optimal performance. They perform equipment maintenance and repair as necessary.

Control and monitor biomass plant activities and perform maintenance as needed.

Monitor, operate, and maintain landfill gas collection system components and environmental monitoring and control systems.

Calculate, measure, load, mix, and process refined feedstock with additives in fermentation or reaction process vessels and monitor production process. They perform, and keep records of, plant maintenance, repairs, and safety inspections.

Operate or control petroleum refining or processing units. They specialize in controlling manifold and pumping systems, gauging or testing oil in storage tanks, or regulating the flow of oil into pipelines.

Distribute or process gas for utility companies and others by controlling compressors to maintain specified pressures on main pipelines.