Ability to stand for long periods of time (up to 12 hours at a time), tolerate work in extreme weather conditions, speak and hear worksite safety instructions, withstand prolonged and repeated: lifting, standing, climbing, kneeling, reaching and feeling, crouching, and crawling. Physical Requirements: Tasks involve the intermittent performance of physically demanding work, typically involving some combination of reaching, bending, stooping, kneeling, or crouching, and that may involve the lifting, carrying, pushing, and/or pulling of moderately heavy objects and materials (20-75 pounds).