California Code, Education Code - EDC § 72025

(1) If a proposal for the establishment of trustee areas is approved by a majority of the voters voting at the election, the establishment of trustee areas shall be effective upon the expiration of the term of the member having the shortest remaining unexpired portion of a term on the date of the election approving the establishment of trustee areas, or the date of expiration of the term of any member elected to the board during the year of the election approving the establishment of trustee areas, whichever is shorter.

(2) The term of any member serving on the board on the date of the election approving the establishment of trustee areas shall be shortened until the date of expiration of the term of the member having the shortest remaining unexpired portion of a term on the date of the election approving the establishment of trustee areas, or the date of expiration of the term of any member elected to the board during the year of the election approving the establishment of trustee areas, whichever is shorter.

(3) Vacancies shall be filled as provided by other provisions of law and the term of the person filling the vacancy shall be determined in accordance with paragraph (2).