An intern may be appointed to serve on the staff of the board or the district administrator for a period of time prescribed by the board, with a maximum of one year. An intern may be assigned responsibilities in any office, department, or agency of the district. Service begins at a time prescribed by the board. Interns shall be appointed without regard to political affiliation. Salaries shall be individually established by the board on the basis of prior experience and the responsibilities of the position to which the intern is assigned.