Sec. 9. A contract that:
(1) was entered into under IC 13-2-1-7 (before its repeal) before July 1, 1991; and
(2) provides for the sale of water on a unit pricing basis in an area described in section 8 of this chapter;
is binding upon the commission. However, the opposite party to the contract is not required to pay compensation to the state for water provided in the area.