Education and Experience requirements at this level consist of five years of experience in skilled building trade or maintenance work involving the construction, maintenance, alteration and/or repair of buildings, grounds and utilities, including two years of supervising employees, inmates, or contractors in one of the fields listed above; or an equivalent combination of education and experience, substituting one year of college or technical school training in the building or construction trades for each year of the required non-supervisory experience. Knowledge, Skills, and Abilities required at this level include knowledge of supervisory principles and practices; of the building trades; of the construction, maintenance, and repair of buildings, grounds, or utility systems, such as heating or steam generating, refrigeration, sewage, water treatment or electrical power generating and distribution; and of building codes.