If the owner of any lot or private premises fails to trim or remove, or refuses to permit the City to remove, any tree or vegetation described in Section 6.46.040 within the twenty one (21) day period described in Section 6.46.050, and the City subsequently causes such tree to be trimmed in excess of once in any consecutive twelve (12) month period, the actual cost to the City to trim such tree for the second and subsequent times during a consecutive twelve (12) month period, inclusive of the City's usual and customary overhead and indirect charges, shall constitute a debt owed by the owner thereof to the City, and the owner shall be liable to the City in a civil action brought by the City for the recovery of such amounts.  (Ord. 5746 § 1 (part); December 12, 2000.)