There is hereby levied a ramp fee, as provided in § 2-6C-1(C), for every aircraft over 5,000 pounds empty of weight that lands at the airport and uses Woodring amenities but does not purchase at least 70 gallons of fuel from the airport. The charge shall be paid prior to the aircraft’s departure, and if not paid prior to departure, a penalty fee as provided in § 2-6C-1(C) shall be added.