Pooling plans shall not apply to the production of goats milk or producer-handlers who produce and sell less than gallons of fluid milk used for class purposes per day unless they specifically request entry into the pool at the time of the adoption of the initial pooling plan for that area. Producers of certified milk or guaranteed raw milk shall have the option, at the time of the adoption of the initial pooling plan under this chapter, to be subject to the plan, and accordingly to have a production base and pool quota established for the producer, or to be excluded from the plan. (

a) Any such producer of less than gallons of fluid milk per day, or any such producer of certified milk, or any such producer of guaranteed raw milk, electing to be excluded from the plan, may at any later time be admitted to the pool, but with only the production base and pool quota to which he or she would have originally been entitled or his or her existing production and average daily class usage during the months preceding his or her entry into the pool, whichever is less. (

b) Any producer claiming exemptions from the provision of any pooling plan by reason of the provisions of

Section 62708, 62708.1, or this section, who loses his or her exemption by failure to meet the requirements for exemptions set forth in those sections shall automatically be deemed to have applied for and become a part of a producer pool on September 1st following any year ended August 31st during which the director determines he or she is no longer entitled to exemption, and his or her admittance into such a pool shall be on the basis of the production base and pool quota calculations as set forth in those sections.