The procedure for a petition to repeal the Charter shall be the same as the procedure for a Charter amendment, as set forth in CCC 37.10.030 except that the sponsor of a repeal shall have 180 days to file petitions with the Auditor, such petitions bearing the signatures of legal voters in the County equal in number to but not less than thirty-five (35) percent of the number of voters in the County who voted for the office of Governor in the last State-wide general election.