Environment: Work outside 25% and inside 75%; on slippery or uneven walking surfaces; frequent exposure to extreme hot and cold temperatures (30O - 110O F), dust, toxic chemicals and materials, noise, and vibration; work around moving objects or vehicles; may work alone; occasional prolonged or irregular hours. Posture: Frequent standing and walking up to 6 hours; sitting up to 2 hours; kneeling/squatting, bending/stooping, twisting, pushing, pulling, crawling, reaching, and twisting; standing/walking, and climbing, wrist turn, and grasping occasionally.