Streets and Highways Code § 25201

Upon receipt of the report of the project, each of the boards of supervisors shall forthwith consider it. Within 60 days after the receipt of the report, each board of supervisors shall by resolution approve or reject the report. Failure of any board of supervisors to act within the time allowed shall be deemed a rejection, but such rejection or a rejection by other means shall be without prejudice to the submission at any time of a new or amended report by the board of directors of the district.