At the hearing any owner of land within the proposed boundaries of the maintenance area or other interested person may offer, and the board or department shall receive, any relevant evidence or testimony relating to the establishment of the boundaries of the area, the zones therein, or the benefits to be received by the continued operation and maintenance of the unit. Any such owner or interested person may object to the inclusion of land within the maintenance area or any zone therein or may request the inclusion of any other land within the area or a change in the boundaries or percentage of benefits of any zone.