A petition to change the boundaries of any proration zone may be filed with the director by producers that produce not less than 10 percent of the production of the commodity which is affected that is produced within the boundaries of the proration zone which is established, or within the boundaries of the area which is proposed to be added. The petition may request that the existing marketing program or a proposed marketing program, as amended, be made applicable to the entire area which is included within the proposed changed boundaries of the proration zone. Upon the receipt of such a petition, the director shall hold a public hearing, as provided in Article 5 (commencing with Section 59641) of this chapter, and receive evidence as to whether or not the boundaries of the proration zone as established shall be changed as recommended.
The director shall also, at the hearing, receive evidence with respect to the marketing program which is to be applicable to all of the area within the proposed changed boundaries of the proration zone.