Cal. Gov. Code § 58860

If the proponents do not accept the county surveyor’s recommendations as contained in his report, they shall file a statement of reasons with the legislative body having jurisdiction to conduct the appropriate proceedings. The proponents shall also furnish a copy of such statement to the county surveyor. The proposal may be circulated or filed with the board of supervisors or the governing body of the district, if any, only after such a report has been furnished.