Cal. PRC § 3649

Any proposed modification of an approved unit agreement shall be submitted by the unit operator to the supervisor for his review and approval. No modification shall alter or change the basis for allocating production to tracts of land theretofore committed to the unit area without the express written consent of all persons who might be adversely affected thereby. The supervisor shall approve the proposed modification if, after a public hearing, he finds that the proposed unit agreement modification is consented to by persons who own title to working interests which aggregate at least an undivided three-fourths of the total working interests within the unit area and by persons who own title to the royalty interest which aggregate at least an undivided three-fourths of the total royalty interest in the unit area, that the proposed modification is in conformity with other provisions of the unit agreement, that it is consistent with the purpose of this chapter, and is fair and reasonable under all the circumstances. Upon approval, the unit agreement modification shall be recorded in the office of the county recorder in each county in which any part of the unit area is situated and thereafter shall be binding upon all persons having any interest in the pool or pools, or portions thereof, subject to the unit agreement the same as if all such persons had expressly agreed to the modification.

Nothing in this section shall be construed as applying to any modification of a unit operating agreement entered into exclusively by the working interest owners.