“(15) To provide that, in case the owner or occupant of such lot cannot be found and no one represents him, or should such owner or occupant, or other person in charge thereof, refuse or neglect to fence in, drain, cleanse, fill up or level the same, when so directed by the proper officer of the council, or be unable, by want of means, to fence in, cleanse, drain, fill up or level such lot, the council may have the same done and may provide that the amount expended thereon shall be a claim recoverable from the owner or occupant in the same manner as a special tax thereon;”;