Working conditions may also include extreme cold and heat, temperature changes, humidity, heights, vibration, wetness, dryness, confined spaces, noise 80-dB and over, fumes, mists, gases, dust, caustics, chemicals, allergens, detergents, mechanical hazards, moving objects, and exposure to burns. Operate medium to large-sized equipment, including backhoe, loader, bulldozer, and track hoe, to install or repair underground utilities and drive/load a dump truck.