Additional physical requirements include the following: physically capable of frequently lifting or moving up to 50 pounds; specific vision requirements include close vision, distance vision, color vision, peripheral vision, depth perception and the ability to focus; ability to sit and stand for extended periods of time; manual dexterity for the purpose of using a telephone and data entry; read a computer screen and printed material with or without vision aids; hear and understand speech at normal levels and on the telephone; and. Interacts with co-workers, supervisors, students, teachers, and the general public; Knowledge of the proper and safe use of equipment, tools and materials necessary for assignment completion; knowledge of cleaning methods, procedures, materials and supplies, and general maintenance repairs.