Costs heretofore or hereafter incurred in the modification of structures under this subchapter, the cause of which results from age and normal deterioration of the structure or from nonperformance of reasonable and normal maintenance of the structure by the operating entity shall be considered as project costs and will be allocated to the purposes for which the structure was authorized initially to be constructed and will be reimbursable as provided by existing law.
With respect to the $100,000,000 authorized to be appropriated in the Reclamation Safety of Dams Act of 1978 [43 U.S.C. 509], costs heretofore or hereafter incurred in the modification of structures under this subchapter, the cause of which results from new hydrologic or seismic data or changes in state-of-the-art criteria deemed necessary for safety purposes shall be nonreimbursable and nonreturnable under the Federal Reclamation law.
The Secretary is authorized to negotiate appropriate contracts with project beneficiaries providing for the return of reimbursable costs under this subchapter: Provided, however, That no contract entered into pursuant to this subchapter shall be deemed to be a new or amended contract for the purposes of section 390cc(a) of this title.