California Code, Harbors and Navigation Code - HNC § 7021

At the hearing the board of supervisors, without further notice, may change the exterior boundaries of the proposed district, as set forth in the petition, by excluding lands which would not be benefited by the proposed harbor development.

The board of supervisors may also change the exterior boundaries of the proposed district by adding to the district and including therein other lands which will be benefited by the proposed harbor development.  Land may not be added to the proposed district unless notice is given by the board of supervisors of the proposed addition or additions to the district by publication of its intention to do so.  The notice shall contain a description of the additional lands to be included in the proposed district, and it shall state the day, hour and place for the owners of land within the proposed addition to appear before the board of supervisors and state their objections, if any, to the inclusion.  The notice shall be published as provided in Section 6066 of the Government Code in a newspaper of general circulation in the county in which the proposed district is located, the first publication to be at least 15 days before the day so fixed.