Upon final hearing, the board of supervisors shall have a finding of facts entered upon the minutes of the meeting if it appears that:
- (a) The petition and notice of hearing have been duly published.
- (b) The petition is signed by a sufficient number of persons who possess the required qualifications.
- (c) A harbor exists within the county, some portion of which is contained within the exterior boundaries set forth in the petition.
- (d) It can be improved and developed as generally described in the petition at a cost not disproportionate to the benefit to be derived from the improvement and development.
- (e) The improvement or development has the approval of the harbor commission, if one exists.