The director is authorized to develop a proposed pooling plan and to designate the proposed areas in which the plan will be made effective. He shall appoint fluid milk producers, and representatives of producers, to be the members and alternate members of a formulation committee, reasonably representative of all producers and areas to be included in the proposed pooling plan, which committee shall advise and assist the director in the establishment of the proposed pooling plan area and in the formulation of the proposed pooling plan. The pooling plan shall include all areas covered by stabilization and marketing plans under Chapter 2 (commencing with Section 61801), except any relatively isolated region of the state may be excluded therefrom, if the director, after a public hearing, finds that the inclusion of the region is not practical or in conformity with the purposes of the pooling plan, or if he finds that the producers in the relatively isolated region do not desire to be a part of either their own or one of the pools.