Under general supervision, incumbents in this journey-level position function as plant operators and/or plant mechanics and are responsible for operating and maintaining a wide variety of complex machinery and equipment in a sewage treatment plant. The essential functions of this classification include, but are not limited to, the following: Makes regular visual, audio, olfactory and tactile inspections and/or manual tests of all plant machinery and equipment, including auxiliary equipment, in an assigned area or pumping station, maintaining logs and records of required maintenance, completed maintenance, equipment and work order history by taking periodic readings of gauges and meters to ensure that sewage plant is working safely, efficiently and properly; and to provide an accurate record of maintenance, preventive maintenance, equipment, and work order history. Performs a variety of manual tasks requiring the handling of equipment exposed to raw sewage; collects and performs simple assessments of raw sewage and chemical samples on prescribed schedule at specific locations by making chemical and physical assessments to assess the efficiency of the treatment processes and to ensure compliance with the NPDES Permit (National Pollution Discharge Elimination System, Permit). Operates, inspects, maintains, overhauls and makes major and minor repairs to wide variety of pumping, heating, ventilating, process machinery and equipment in a wastewater treatment plant or pumping station, including pumps, bar racks, grit collectors, conveyors and washers, chlorinators, evaporators and storage tanks, sludge collectors, drive units, deodorizing equipment and a wide variety of metering and recording devices to assure the safety and efficiency of equipment and facilities; includes lubricating and greasing machinery and equipment; cleaning and maintaining machinery, equipment and facility to ensure safety and equipment reliability. Inspects sewage pipelines, tanks and gates to check for the condition of equipment, for infiltration and blockage of debris and build-up of mineral deposits, etc., by draining tanks, by monitoring pressure and flow indicators and by visual inspection to determine any problem areas to ensure proper operation. Operates, inspects and maintains solids treatment and flocculating chemical systems by monitoring and adjusting flow indicators or controllers, by visual inspection and by analysis of samples to ensure optimum treatment. Operates, inspects and maintains disinfection and dechlorination systems by performing tests and analyzing sample to determine proper chemical dosages to ensure that effluent or final discharge meets Regional and State pollution control requirement. May assist in training and in supervising work of apprentices or other trainees by oral instruction and hands-on demonstration in the operation and maintenance of sewage treatment processes to ensure competent performance of required skills by apprentices and other trainees. Perform duties as listed in the 7372 Stationary Engineer, Sewage Plant class specification, which can be found on DHR’s website .