Sts. & Hy. Code, § 8781

The cost of the publication and posting of the notice and of making the supplemental assessment may be included in the supplemental assessment. A copy of the order levying the supplemental assessment shall be recorded in the office of the street superintendent and from and after such recording, the sum therein levied on any lot shall be and constitute a lien thereon and thereafter bear interest at the rate specified in the bonds. The several amounts levied by the supplemental assessment shall be extended on the next succeeding tax rolls to be delivered to the tax collector and shall be collected in the manner provided for the collection of installments of the original assessments.