Principles and practices of supervision, including work planning, review and evaluation, progressive discipline, team and individual professional development, and the training of staff in work procedures; applicable Federal, State, and local laws, regulatory codes, ordinances, and procedures relevant to park maintenance operations; methods of estimating time, cost, and equipment necessary for park maintenance projects; principles and practices of contract administration and evaluation; purchasing procedures, forms, and techniques; basic principles and practices of budget development and monitoring; safety principles, practices, procedures, and equipment related to park maintenance work; methods, practices, tools, and equipment used in the maintenance of City parks, grounds, open spaces, associated facilities, and athletic fields; operation and minor maintenance of hand and power tools, vehicles, and light to heavy power equipment; equipment and tools used in irrigation installation and maintenance; maintenance and care requirements of lawns, shrubs, trees, and flowers, including watering, fertilization, and weed abatement techniques; pesticides, herbicides, insecticides, fungicides, and fertilizers and their safe application; occupational hazards and safety equipment and practices related to the work, including handling of hazardous chemicals; safe driving rules and practices; job related arithmetic; and modern office practices, methods, computer equipment, and applicable software applications. Under direction, the Park Maintenance Supervisor supervises the performance of park maintenance staff; plans and coordinates resources required for park maintenance; ensures that park maintenance staff receive proper safety training and adhere to established safe work practices; conducts park needs assessment; administers contracts; inspects work; and performs related work as assigned.