Frequent work performed outside or with risk exposure, including exposure to hazardous chemicals, raw sewage, communicable diseases, loud or constant noise, electricity, humidity, wetness, extreme temperatures, heights, odors, gases, mists, confined spaces, climbing ladders, cramped spaces, and inherent construction-related hazards. Perform a range of treatment facility activities, including, but not limited to, operation of equipment, housekeeping, monitoring systems, managing equipment performance and process data, process improvement, and record keeping.