Under limited supervision, performs skilled mechanical and operational craftwork at the journeyman level in the operation, maintenance, installation, repair, and troubleshooting of wastewater process equipment and components of wastewater treatment plants. Work assignments are subject to established procedures, practices, or well-defined policies and are reviewed, usually after the fact, in terms of quality, timeliness, and adherence to methods, standards, and policies. Work requires knowledge of equipment operation, maintenance, regulations, policies, methods, standards, and procedures governing operation and maintenance of wastewater process equipment. Work is performed following established methods, practices, and procedures which are substantially diversified and some latitude is permitted to consider and choose the most appropriate method, technique or procedure to follow. Solves complex problems within established parameters and identifies and recommends responses to new and unusual circumstances. Work is performed both indoors and outdoors, where there are some risks and hazards. May act as lead on jobs and train other workers. Contacts require courtesy, tact, and effectiveness in dealing with others to request or provide information, ask questions or obtain clarification. Employees in this class may be required to work evenings, weekends, holidays and rotating shift.