Cal. Food & Agric. Code § 78302
(c) The secretary shall establish a referendum period that shall not be less than 10 days nor more than 60 days in duration. The secretary may prescribe additional procedures necessary to conduct the referendum. At the close of the established referendum period, the secretary shall tabulate the ballots filed during the period. The secretary shall suspend the operation of this chapter if the secretary finds that at least 40 percent of the total number of producers from the list established by the secretary have participated in the referendum and either one of the following has occurred: