CA Gov't Code Section 58858

The county surveyor may make changes in the boundaries set forth in a proposal if:

(a)

The proponents consent; and

(b)

The territory contained within the revised boundaries complies with the requirements of any applicable law and does not include any territory which could not have been included at the time of the filing of the proposal. If written notice was previously given pursuant to Section 58855, within five days after making any such change, the county surveyor shall give written notice thereof to any city or district, within three miles of the changed boundaries, which was not previously given notice.