The City Manager shall, within 60 days after the completion of each local or special public improvement, compile the actual cost thereof and certify the same to the City Assessor, who shall adjust the special assessment roll to correspond therewith.
When any special assessment roll shall prove insufficient to pay the cost of the improvement for which it was made, the Council may make an additional pro rata assessment, but the total amount assessed against any one parcel of land shall not exceed the value benefits received by such lot or parcel of land.
Should any assessment under the provisions of this chapter prove larger than necessary by 5% or less, the same shall be reported to the Council which may place the excess in the City treasury or make a refund thereof pro rata according to assessment. If the entire excess shall be credited to owners of property as shown by the City assessment roll upon which the assessment has been levied, the refund shall be pro rata according to assessment.
Any excess refund where payment in full has not been received shall be made by credit against future unpaid installments in the inverse order in which they are payable to the extent such installments exist and the balance of such refund shall be made in cash.
No refunds of special assessments may be made which impair or contravene the provisions of any outstanding obligation or bond secured in whole or in part by such special assessment.
Whenever the Council shall deem that any special assessment is invalid or defective for any reason whatsoever, or if any court of competent jurisdiction shall have adjudged such assessment to be illegal, for any reason whatsoever, in whole or in part, the Council shall have the power to cause a new assessment to be made for the same purpose for which the former assessment was made, whether the improvement or any part thereof has been completed or not, and whether any part of the assessment has been collected or not.
All proceedings on reassessments and for the collection thereof shall be made in the same manner as provided in an original assessment and if any portion of the original assessment shall have been collected and not refunded, it shall apply upon the reassessment and the reassessment shall to that extent be deemed satisfied. If more than the amount reassessed shall have been collected, the balance shall be refunded to the persons making such payments.