; and (C) not modify other water service, repayment, exchange and transfer contractual rights between the water users’ association, and the Bureau of Reclamation, or any rights, obligations, or relationships of the water users’ association and their landowners as provided under State law. (b) Accounting The amounts paid pursuant to subsection (a) shall be subject to adjustment following a final cost allocation by the Secretary of the Interior. In the event that the final cost allocation indicates that the costs properly assignable to the contractor are greater than what has been paid by the contractor, the contractor shall be obligated to pay the remaining allocated costs. The term of such additional repayment contract shall be not less than one year and not more than 10 years, however, mutually agreeable provisions regarding the rate of repayment of such amount may be developed by the parties. In the event that the final cost allocation indicates that the costs properly assignable to the contractor are less than what the contractor has paid, the Secretary shall credit such overpayment as an offset against any outstanding or future obligation of the contractor. (c) Applicability of certain provisions (1) Effect of existing law Upon a contractor’s compliance with and discharge of the obligation of repayment of the construction costs pursuant to a contract entered into pursuant to subsection (a)(2)(A), subsections (a) and (b) of section 213 of the Reclamation Reform Act of 1982 (96 Stat. 1269) shall apply to affected lands. (2) Effect of other obligations The obligation of a contractor to repay construction costs or other capitalized costs described in subsection (a)(2)(B), (a)(3)(B), or (b) shall not affect a contractor’s status as having repaid all of the construction costs assignable to the contractor or the applicability of subsections (a) and (b) of section 213 of the Reclamation Reform Act of 1982 (96 Stat. 1269) once the amount required to be paid by the contractor under the repayment contract entered into