The public works director shall have the right to cut down and to remove any tree, tree limb or shrub which may be permitted to remain in violation of the provisions of this chapter after service of notice to remove the same. The public works director shall report to the mayor and city council the cost of removing such tree, tree limbs or shrubs, and the cost thereof shall, by ordinance, be assessed against the property on which such tree, tree limbs or shrubs was removed, and the amount thereof shall be a lien on such premises and shall bear interest at the rate of six percent per annum from the date of such levy until paid. The same shall be collected and enforced as in the case of special assessments.