The petition properly signed shall be filed with the city clerk upon payment of a filing fee, which shall be paid into the general fund of the city to aid in defraying of expenses incurred by the city in checking the sufficiency of such petition and investigating or reporting the facts and shall not be returned to the petitioners regardless of the city council’s action on such petition. The amount of such fee shall be established by resolution of the city. In the event that the filing fee, computed on petitioner’s estimate, proves to be insufficient as evidenced by the city investigation, the balance of the fee shall be paid before notices of hearing are mailed. (Ord. 1633 § 1, 1996; Ord. 1306 § 25, 1988).