The proceeds from the sale of bonds authorized by chapter 498, Laws of 2009 shall be deposited in the state route number 520 corridor account created under chapter 472, Laws of 2009, and shall be available only for the purposes enumerated in RCW 47.10.879, for the payment of bond anticipation notes or other interim financing, if any, capitalizing interest on the bonds, and for the payment of bond issuance costs, including the costs of underwriting.