California Code, Public Resources Code - PRC § 3650

If at any time after the entry of an order of unitization issued pursuant to Section 3645, it develops that all or a portion of a further tract or tracts of land should be included within the unit area, persons who own any working interest in the pool or pools, or portions thereof, may file a petition with the supervisor requesting the addition of such tract or tracts of land to the unit area, insofar as they contain the pool or pools, or portions thereof.  Upon the filing of such a petition, the supervisor shall hold a public hearing.