R.I. Gen. Laws § 32-2-5

To meet the expenses incurred under the foregoing provisions of this chapter, the state controller is hereby authorized and directed, upon receipt of vouchers properly authenticated by the director of environmental management, to draw his or her orders on the general treasurer for the payment of the vouchers, from the amounts hitherto appropriated by, and from any other moneys held in the general treasury under the provisions of this chapter.