Tasks involve the ability to exert heavy physical effort and heavy work, including climbing, balancing, stooping, kneeling, crouching and crawling and lifting, carrying, pushing, and/or pulling of moderately heavy objects and materials weighing 20 to 50 pounds; may occasionally involve heavier objects and materials weighing up to 100 pounds. Tasks are regularly performed with potential expose to adverse environmental conditions such as strong odors, fumes, dust, wetness, humidity, machinery, vibrations, temperature and moist extremes, disease, pathogenic substances and toxic/poisonous agents.