; and (2) the status of those funds. (b) Establishment of balance sheet Each district of the Corps of Engineers shall— (1) maintain a balance sheet for each project carried out by the Secretary for which a non-Federal cost-share is required; and (2) on request of a non-Federal interest that contributed funds for the project, provide to the non-Federal interest a copy of the balance sheet. (c) Under-Budget projects In the case of a project carried out by the Secretary for which the project is completed at a cost less than the estimated cost, the Secretary shall transfer the excess funds back to the non-Federal interest, in accordance with the cost-share requirement applicable to the project. (d) Excess funds (1) In general In the case of a completed project carried out by the Secretary for which funds in excess of the funds needed to complete the project have been contributed by a non-Federal interest, the Secretary shall transfer the excess funds to a separate account of the Secretary, in which the funds shall remain available until the non-Federal interest uses the funds in accordance with paragraph (2). (2) Use in future projects or operation and maintenance costs The non-Federal interest may use funds in the account for the non-Federal interest under paragraph (1)— (A) to pay the cost-share for other projects carried out by the Secretary for which a non-Federal cost-share is required