Card lock or key-type dispensing mechanisms for Class I and Class II liquids, and liquefied petroleum gases shall be authorized so long as they are dispensed by a qualified attendant for service stations which are not open to the public and for which the mechanism is used only by commercial, industrial, governmental or manufacturing establishments for fueling vehicles used in connection with their businesses, provided that the owner of such station is accountable for the safe operation of the station and the training of the users thereof. Such stations may include card or key operated dispensers. Each service station operating a card or key operated dispenser shall provide the city with a letter signed by a duly authorized representative of the service station indicating the name of the commercial, industrial, governmental or manufacturing establishment authorized to use the card or key operated dispenser, and the name of the individual employed by the establishment trained to operate the dispensing mechanism. Such letter shall also indicate the date or dates on which the individual was trained in the use of the dispenser. (Ord. 1172-85 § 1, 1985; Ord. 172-71 § 8.)