No local improvement assessment shall be invalid because the city engineer’s report fails to contain all of the information required by Section 13.16.020 – or because the declaring resolution, the assessment ordinance, the lien docket or required notices do not contain the required information – or by the failure to list the name of, or mail notice to, the owner of any property as required by Sections 13.16.040, 13.16.090 and 13.16.140 – or by reason of any other error, mistake, delay, omission, irregularity, or other act, jurisdictional or otherwise, in any of the proceedings or steps specified. The council may correct all assessments that are unfair or unjust.