(a) For the purpose of providing funds to enable the authority to pay on their respective due dates the principal of and the interest and premium (if any) on any bonds issued by it under the provisions of this chapter and to accomplish the objects of this chapter, there is hereby irrevocably pledged to such purpose and there is hereby appropriated so much as may be necessary for such purpose of the receipts from the incremental and additional excise taxes or fees levied on the disposal of hazardous waste or hazardous substances by the provisions of (i) the act resulting from the enactment of House Bill 310 introduced at the 1990 Regular Session of the Alabama Legislature (whether such bill is enacted before or after this chapter) or (ii) any other statute, now or hereafter enacted, which appropriates or pledges such a tax or fee for the payment of the principal of and the interest and premium (if any) on bonds issued by the authority under the provisions of this chapter.

(b) A Debt Service Reserve Fund is authorized to be established and maintained in such an amount and under such conditions for any or all series of the bonds as may be determined by the authority in its resolution(s) relating to the bonds. The authority is authorized to make payments from bond proceeds or any other funds or revenues available to it (including tax revenues pledged for the payment of the authority's bonds in excess of those required to meet current debt service on such bonds) into the Debt Service Reserve Fund. Income earned from the investment of moneys held in the Debt Service Reserve Fund may be used by the authority for any purpose designated by the authority that would constitute a permitted use of funds of the authority under this chapter. The authority is authorized to determine the conditions for the utilization of the Debt Service Reserve Fund (including earnings from the investment of such fund) in its resolution(s) relating to the bonds secured thereby, and by the terms of such resolution(s), to dedicate and pledge such fund and the investment earnings therefrom to payment of debt service on the bonds.