A county or ferry district operating ferries under this chapter may impose a vessel replacement surcharge on every ferry fare sold. The surcharge must be at least equal to the surcharge amount included in Washington state ferry fares identified in RCW 47.60.315(7). Revenues generated from the surcharge may be used only for the construction or purchase of ferry vessels and to pay the principal and interest on bonds authorized for the construction or purchase of ferry vessels. The surcharge must be clearly indicated to ferry passengers and drivers and, if possible, on the fare media itself.