Environmental Conditions: The work is performed inside and/or outside and includes being exposed to extreme cold, extreme heat, noise, vibration, mechanical hazards, electrical hazards, chemical hazards, atmospheric conditions that affect the respiratory system or skin, and oils; may work in confined spaces, darkness or poor lighting conditions, trenches, and/or isolation. Performs minor repairs and routine maintenance of air conditioning and heating systems; performs minor repairs to plumbing fixtures; participates in routine building maintenance such as carpentry, painting, masonry, plumbing, and mechanical work.