40 CFR § 13.4 - Other remedies.
(a) This regulation does not supersede or require omission or duplication of administrative proceedings required by contract, statute, regulation or other Agency procedures, e.g., resolution of audit findings under grants or contracts, informal grant appeals, formal appeals, or review under a procurement contract.
(b) The remedies and sanctions available to the Agency under this regulation for collecting debts are not intended to be exclusive. The Agency may impose, where authorized, other appropriate sanctions upon a debtor for inexcusable, prolonged or repeated failure to pay a debt. For example, the Agency may stop doing business with a grantee, contractor, borrower or lender; convert the method of payment under a grant or contract from an advance payment to a reimbursement method; or revoke a grantee's or contractor's letter-of-credit.