Sec. 12.5 Procedure to be fixed by ordinance.

   The council shall prescribe by ordinance the complete special assessment procedure concerning the initiation of projects, plans and specifications, estimates of costs, notice of hearings, making and confirming assessment rolls, and the correction of errors therein, collection of special assessments, and any other matters concerning the making of improvements by the special assessments method, subject to the provisions of this chapter.

Sec. 12.6 Objection to improvement.

   If, at or prior to final confirmation of any special assessment, more than fifty per cent of the number of owners of privately owned real property to be assessed for any improvement, or in case of paving or similar improvements more than fifty per cent of the number of owners of frontage to be assessed for any such improvement, shall object in writing to the proposed improvement, the improvement shall not be made by proceedings authorized by this charter without a five-seventh vote of the members of the council, provided that this section shall not apply to sidewalk construction.

Sec. 12.7 Installment payments of assessments.

   The council may provide for the payment of special assessments in annual installments, not to exceed thirty in number, the first installment being due upon confirmation of the roll and the deferred installments being due annually thereafter or, in the discretion of the council, may be spread upon and made a part of each annual city tax roll thereafter until all are paid. Interest may be charged upon deferred installments at a rate not to exceed the maximum allowed by state law. Under any installment plan adopted, the whole or any deferred installments with accrued interest to date of payment may be paid in advance of the due dates established.

Sec. 12.8 Additional assessments.

   When any special assessment roll shall prove insufficient to meet the costs of the improvements 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 benefits received by said lot or parcel of land.

Sec. 12.9 Refunds of assessments.

   The city manager shall within sixty days after the completion of each special assessment project compile the actual cost thereof and certify same to the council. Should the assessment prove larger than necessary by five per cent or less, the council may place the exCess in the city treasury; if more than five per cent, the excess shall be refunded pro rata according to assessments. In either case, the council may provide by resolution that the amount of any such excess may be allowed as a credit on the last installment where such installment still remains unpaid at the time the final cost of the improvement is determined.

Sec. 12.10 Special assessment accounts.

   Except as otherwise provided in this chapter, moneys raised by special assessments to pay the cost of any local improvement shall be held in a special fund to pay such cost or to repay any money borrowed therefor. Each special assessment account must be used only for the improvement project for which the assessment was levied, except as otherwise provided in this chapter.

Sec. 12.11 Contested assessments.

   Except and unless notice is given to the council in writing of an intention to contest or enjoin the collection of any special assessment for the construction of any pavement, sewer, or other public improvement, the construction of any sidewalk, or the removal or abatement of any public hazard or nuisance, within thirty days after the date of the meeting of the council at which the assessment roll in question is confirmed, which notice shall state the grounds on which the proceedings are to be contested, no suit or action of any kind shall be instituted or maintained for the purpose of contesting or enjoining the collection of such special assessments; and regardless of whether or not any public improvement is completed in any special district, no owner of real property located in such district shall be entitled to commence any suit or action for the purpose of contesting or enjoining the collection of any such special assessments after he has received the benefits from the substantial completion of that portion of such public improvement for which he is assessed.

Sec. 12.12 Reassessments for benefits.

   Whenever the council shall deem any special assessment invalid or defective for any reason whatever, or if any court of competent jurisdiction shall have adjudged such assessment to be illegal for any reason whatever, in whole or in part, the council shall have 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 such reassessment and for the collection thereof shall be made in the same manner as provided for in an original assessment. If any portion of the original assessment shall have been collected and not refunded, it shall be applied 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.