Charges for such removal shall be a lien upon the premises. Whenever a bill for such charges remains unpaid thirty (30) days after it has been rendered, the city clerk may file with the county recorder of deeds a statement of lien claim. This statement shall contain a legal description of the premises, the expenses and costs incurred, the date of work, and a notice that the city claims a lien for this amount. Notice of such lien claim shall be mailed to the owner of the premises if his address is known. Provided, however, that failure of the city clerk to record such lien claim or to mail such notice, or the failure of the owner to receive such notice shall not affect the right to foreclose the lien for such charges as provided in section 5-2-4 of this chapter. (Ord. 81-O-9, 8-7-1981)