Streets and Highways Code § 33114

The authority may provide for the making of a covenant requiring the authority to pay and discharge from the funds available for that purpose all lawful claims for labor, materials and supplies, or other charges which if unpaid may become a lien or charge upon all or any part of the revenue, any facilities or properties, revenues charged with the payment of any bonds in connection with which the covenant is made, or physical properties of the project which may impair the security of the bonds.