The members of the community advisory committee shall be appointed by, and responsible to, the governing board of each participating district or county office, or any combination thereof participating in the local plan. Appointment shall be in accordance with a locally determined selection procedure that is described in the local plan. Where appropriate, this procedure shall provide for selection of representatives of groups specified in Section 56192 by their peers. Such procedure shall provide that terms of appointment are for at least two years and are annually staggered to ensure that no more than one half of the membership serves the first year of the term in any one year.