In the discretion and at the option of the board such bonds or notes may be secured by a trust indenture by and between the authority and a corporate trustee, which may be a trust company or bank having powers of a trust company within or without the State of West Virginia. The resolution authorizing the bonds or notes and fixing the details thereof may provide that such trust indenture may contain such provisions for protecting and enforcing the rights and remedies of bondholders as may be reasonable and proper, not in violation of law, including covenants setting forth the duties of the authority and the members of its board and officers in relation to the construction or acquisition of solid waste facilities and the improvement, extension, operation, repair, maintenance and insurance thereof, and the custody, safeguarding and application of all moneys, and may provide that all or any part of the construction work shall be contracted for, constructed and paid for, under the supervision and approval of consulting engineers employed or designated by the board and satisfactory to the original bond purchasers, their successors, assignees or nominees, who may be given the right to require the security given by contractors and by any depository of the proceeds of bonds or notes or revenues of the solid waste facilities or other money pertaining thereto be satisfactory to such purchasers, their successors, assignees or nominees. Such indenture may set forth the rights and remedies of the bondholders or noteholders and such trustee.