California Code, Harbors and Navigation Code - HNC § 6023

The board of supervisors shall investigate and determine whether or not the improvement and development work generally described in the petition is feasible and whether, when completed, it will result in the improvement and development of the harbor and become a benefit to the property within the district.

If it appears, and the board of supervisors finds, that it is necessary in order to make sufficient and adequate investigation upon which to determine such questions to continue the hearing beyond ninety days, the board of supervisors may do so, but the hearing shall be completed within six months from the date of the presentation of the petition.