A resolution of issuance may include a covenant that the department will duly pay and discharge, or cause to be paid and discharged, any taxes, assessments, or other governmental charges lawfully imposed upon any properties owned by or under the jurisdiction of the department, or upon the revenues, as well as any lawful claim for labor, materials, or supplies which, if unpaid, might become a lien or charge upon the revenues, or which might impair the security of the revenue bonds.