(a)      The County Commissioners of Calvert County may provide that any valid unpaid charges made against any real property within the county for the removal of any unauthorized accumulation of weeds and debris from that property shall be liens, until paid, upon the real property against which the removal charges have been made.

      (b)      Prior to the removal of weeds or debris from property under circumstances which could result in the imposition of a lien as provided in subsection (a), reasonable notice shall be given to the property owner that such a lien may be imposed.