The director may establish a violator facility as a freestanding facility, or designate a portion of an existing correctional facility for the purpose. A violator facility is for the temporary confinement of offenders who have violated conditions of release under work release or parole as defined in section 906.1, or probation granted as a result of suspension of a sentence to the custody of the director of the department of corrections. If a violator facility is established, the director shall adopt rules pursuant to chapter 17A, subject to the approval of the board, to implement this section.