SECTION 30. REFERENDUM.
   The electors shall have the power to approve or reject at the polls any ordinance or resolution passed by the Council, except as hereinafter provided. Within thirty (30) days after the final passage by the Council of an ordinance or resolution, a petition signed by at least ten per cent (10%) of the registered electors of the City may be filed with the Clerk of the Council, requesting that such ordinance or resolution be either repealed or submitted to a vote of the electors. If said petition is signed by twenty per cent (20%) or more of such registered electors, the date of the election may be fixed therein, not less than ninety (90) days from the time of filing thereof. When such petition is filed, the Clerk shall first ascertain the sufficiency of the petition, and if found sufficient, the Council shall thereupon, within thirty (30) days of the filing of such petition, reconsider such ordinance or resolution. If upon such reconsideration the ordinance or resolution is not repealed, the Council shall provide for submitting it to a vote of the electors on the date so fixed, or at the first general election in any year occurring more than ninety (90) days from the filing of such petition, if no date be so fixed. No such ordinance or resolution shall go into effect until approved by a majority of those voting thereon. When the Council by law or under provisions of general ordinances, is required to pass more than one ordinance or resolution necessary to make and pay for any public improvement, the referendum provision shall apply only to the first ordinance or resolution required to be passed and not to any subsequent ordinances or resolutions relating thereto. Ordinances providing for the annual tax levy or for improvements petitioned for by the owners of a majority of the foot front of the property benefited and to be specially assessed therefor, and appropriation ordinances limited to the subject of appropriations shall not be subject to referendum, but all other ordinances, including emergency ordinances, shall be subject to referendum, except that emergency ordinances shall go into effect at the time indicated therein. If, when submitted to a vote of the electors, an emergency measure be not approved by a majority of those voting thereon, it shall be considered repealed as regards any further action thereunder; but such measure shall be deemed sufficient authority for payment, in accordance with the ordinance, of any expense incurred previous to the referendum vote thereon.
   Ordinances submitted to the Council by initiative petition and passed by the Council either with or without change, but not required to be submitted to a vote of the electors shall be subject to referendum in the same manner as other ordinances.
THE MAYOR