Cal. Pub. Resources Code § 3645
Upon giving his approval to the unit agreement pursuant to Section 3643, the supervisor shall issue an order directing unit operations of the unit area in accordance with the unit agreement, directing the recordation of such agreement in the office of the county recorder in each county in which any part of the unit area is situated, and requiring that the interests of all persons in the unit area be thereafter subject to the unit agreement the same as if all such persons had expressly consented to the unit agreement. An order of the supervisor issued pursuant to this section shall become effective on the date provided for in the order, except that no such order shall become effective until all interests in the unit area for which timely offers of sale have been made pursuant to Section 3647 have been purchased as provided in that section, or until the termination of such offers of sale.
Ca. Pub. Res. Code § 3645