Physical Requirements: Tasks involve the regular and, at times, sustained performance of moderately physically demanding work, typically involving some combination of climbing and balancing, stooping, kneeling, crouching, and crawling, and that may involve the lifting, carrying, pushing, and/or pulling of moderately heavy objects and materials (10-20) pounds). Work Environment: Tasks are performed with risk of exposure to adverse environmental conditions, such as temperature and noise extremes, wetness, humidity, toxic/poisonous agents, and strong odors.