Ability to: inspect and direct the work of contracted personnel; calculate area measurements and quantity of materials; effectively respond to and resolve complaints and inquiries from the public; learn basic contract administration methods and practices; follow oral and written instructions and departmental safety practices and procedures; work independently and make independent decisions; represent the department with tact; establish and maintain effective and productive working relationships with coworkers, members of other County departments/divisions, contractors, and members of the community; keep records and prepare accurate written records/reports; and communicate clearly and effectively with management, contractors, representatives from other agencies, and members of the public. Knowledge of: local tree species; tree maintenance, planting, and removal methods and equipment; principles and practices of tree assessment, tree removal, site preparation, landscaping, species selection, and planting; arboreal insect and disease control methods and techniques; proper methods of repairing, modifying, and constructing sidewalks, curbs, gutters, ramps, and aprons; surveying methods and techniques; basic mathematics; and safety practices related to tree maintenance, construction projects, and traffic control.