R.I. Gen. Laws § 2-17-4: Appropriations and expenses.

To meet the expenses incurred under the authority of §§ 2-17-1 — 2-17-8 there shall be allowed and paid out of the treasury of the state any sum that the general assembly may annually appropriate, to be expended under the direction of the director of environmental management, from time to time, upon vouchers approved by the director.