A port district may establish a fund to be utilized in effectuating the intent of this chapter. The port district may finance such fund by: The proceeds of any grants or loans made by federal agencies; rentals, charges and other revenues as may be generated by programs authorized by this chapter, airport revenues; and revenue bonds based upon such revenues. The port district may also finance such fund, as necessary, in whole or in part, with the proceeds of general obligation bond issues of not more than one-eighth of one percent of the value of taxable property in the port district: PROVIDED, That any such bond issue shall be in addition to bonds authorized by RCW 53.36.030: PROVIDED FURTHER, That any such general obligation bond issue may be subject to referendum by petition as provided by county charter, the same as if it were a county ordinance.