Must be able to stand, walk, bend, climb, push, pull, stoop, twist, stretch, squat, reach and lift to 50 pounds from floor to waist level without assistance, climb ladders up to 20 feet with assistance and up to 10 feet unassisted, and be able to work on feet for prolonged periods of time. Individuals must possess knowledge, skills, and ability to successfully perform the essential functions of the position or be able to explain or demonstrate how the essential functions will be performed, with or without reasonable accommodation, using some other combination of skills and abilities.