The employee must be capable of vigorous outdoor activities and have manual dexterity with physical ability to work extended hours, climbing, bending, kneeling, squatting, working with arms extended above the head, twisting upper body, standing for long periods, walking on catwalks, working in confined spaces, exposure to extreme weather conditions, driving a vehicle, and operation of forklifts and light industrial equipment. While performing the functions of this job, the employee is routinely exposed to work in potentially flammable or hazardous atmospheres; near moving mechanical parts; in varying weather conditions typical of West Texas; in varying hours due to on-call rotation; in high noise and vibration areas; and wearing varying degrees of personal protective equipment.