The petition may consist of one or more copies, or subscription lists, circulated separately, and the signatures thereto may be upon the paper or papers containing the form of petition, or upon other papers attached thereto. Verifications provided for in the next preceding section of this Article may be made by one or more petitioners, and the several parts of copies of the petition may be filed separately and by different persons; but no signatures to such petition shall remain effective or be counted which were placed thereon more than forty-five days prior to the filing of such petition or petitions with the person performing the duties of City Secretary. All papers comprising a recall petition shall be filed with the person performing the duties of City Secretary on the same day, and the said Secretary shall immediately notify, in writing, the officer so sought to be removed, by mailing such notice to such officer's Port Isabel address. The City Secretary shall examine the same and certify that the signatures are true and correct and that the petition meets the requirements of this Charter.