Moderate lifting and carrying (50 lbs.), straight pushing and pulling, reaching above shoulders, use of fingers and both hands required, walking and standing, repeated bending, climbing, crawling, kneeling (use of both legs and arms), operation of crane, truck, tractor, or motor vehicle, both eyes required with depth perception and ability to distinguish basic colors and shades of colors, hearing (aid permitted). Personnel classified under this labor category shall not be substituted with lower-skilled welding labor categories, including welding helpers, welding assistants, or personnel qualified to perform only a single welding process.