Working knowledge of the functions and mechanics of pumps and related equipment used in a modern wastewater plant; skill in the operation, maintenance, and repair of pumps and other plant facilities; able to perform simple chemical tests; able to keep records and derive and prepare accurate reports from those records; mechanical aptitude. Work is performed in a wide variety of environments, including laboratories, confined spaces, and outside weather conditions, and may be exposed to fumes, oils, chemicals, raw sewage, etc.