Any bonds issued under the provisions of this chapter and at any time outstanding may at any time and from time to time be refunded by a municipality by the issuance of its refunding bonds in such amount as the governing body may deem necessary but not exceeding an amount sufficient to refund the principal of the bonds to be so refunded, together with any unpaid interest thereon and any premiums and commissions necessary to be paid in connection therewith: PROVIDED, That an issue of refunding bonds may be combined with an issue of additional revenue bonds on any facilities. Any such refunding may be effected whether the bonds to be refunded shall have then matured or shall thereafter mature, either by sale of the refunding bonds and the application of the proceeds thereof for the payment of the bonds to be refunded thereby, or by exchange of the refunding bonds for the bonds to be refunded thereby: PROVIDED FURTHER, That the owners of any bonds to be so refunded shall not be compelled without their consent to surrender their bonds for payment or exchange except on the terms expressed on the face thereof. Any refunding bonds issued under the authority of this chapter shall be subject to the provisions contained in RCW
70A.210.050 and may be secured in accordance with the provisions of RCW
70A.210.070.