34 C.F.R. § 31.3
(a) At least 65 days before initiating an offset against the pay of an employee, the Secretary sends a written notice to the employee stating—
(4) The Secretary's intention to collect the debt by offset against—
(6) The employee's opportunity to—
(11) That the Secretary does not delay the start of the proposed offset, or suspend an offset already commenced, unless—
(b)
(1) In determining whether an employee has requested an opportunity set forth under paragraph (a)(6) of this section in a timely manner, the Secretary relies on—
(2) The Secretary does not rely on either of the following as proof of mailing:
(c) Payment by offset under this part of all or part of a debt does not constitute an acknowledgment of the debt or a waiver of rights available to the employee under this part or other applicable law if the employee has not agreed in writing to the offset.
(Authority: 5 U.S.C. 5514; 31 U.S.C. 3716)