Chapter 3. Establishing District Boundaries of California Streets And Highways Code >> Division 16. >> Part 2. >> Chapter 3.

In fixing the final boundaries of the district the board of supervisors may exclude any lands which it finds have been improperly included.

The board of supervisors may include any lands adjacent to those described in the petition, either on:
  (a) Petition of the owners of the adjacent lands; or
  (b) Upon notice of its intention to include the adjacent lands within the district. If the lands are included upon notice, the notice shall be published in the same manner and for the same time as the original notice of hearing.

The notice of intention to include adjacent lands shall refer to the petition for the formation of the district on file with the board of supervisors, shall describe the adjacent territory intended to be included within the proposed boundaries of the proposed district and direct all persons interested to appear at a specified time and place and show cause if any there be why the described lands should not be included within the district.

Upon the petition and evidence produced at the hearings the board of supervisors shall determine and fix the boundaries of the district and shall, by order entered in its minutes, define and establish such boundaries.