Operate or control an entire process or system of machines, often through the use of control boards, to transfer or treat water or wastewater.

Operate or control nuclear reactors. They move control rods, start and stop equipment, monitor and adjust controls, and record data in logs. They implement emergency procedures when needed. They respond to abnormalities, determine cause, and recommend corrective action.

Set up, operate, or watch over wood sawing machines. They operate cnc equipment. Includes lead sawyers.

Directly supervise and coordinate the activities of mechanics, installers, and repairers.

Help extraction craft workers, such as earth drillers, blasters and explosives workers, derrick operators, and mining machine operators, by performing duties requiring less skill. Their duties include supplying equipment or cleaning work area.

Assemble or repair oil field equipment using hand and power tools. They perform other tasks as needed.

Place and detonate explosives to demolish structures or to loosen, remove, or displace earth, rock, or other materials. They perform specialized handling, storage, and accounting procedures. Includes seismograph shooters.

Operate equipment to increase oil flow from producing wells or to remove stuck pipe, casing, tools, or other obstructions from drilling wells. They also perform similar services in mining exploration operations. Includes fishing tool technicians.

Identify, remove, pack, transport, or dispose of hazardous materials, including asbestos, lead based paint, waste oil, fuel, transmission fluid, radioactive materials, or contaminated soil. They are generally required specialized training and certification in hazardous materials handling or a confined entry permit. They operate earth moving equipment or trucks.

Help brick, block and stone masons, or tile and marble setters by performing duties requiring less skill. Their duties include using, supplying or holding materials or tools, and cleaning work area and equipment.