In the event that any person or entity fails to pay the appropriate fee, the Director of Public Works shall be and is hereby directed to bill such person or entity for the difference between the appropriate fee (for all use of the facility under the terms of this section) and the fee which was actually paid and such delinquent fee shall be immediately due and owing. If any such fee is delinquent for more than 30 days, the Director shall take such legal steps as are required to enforce the obligation for payment. An administrative fee of 10 percent of the delinquent amount, with a minimum of $10.00, shall be assessed for any such collection. (Ord. 852, eff. 7/17/97)