41 C.F.R. § 105-57.006 – Wage garnishment order.

(a) Unless GSA receives information it believes justifies a delay or cancellation of the withholding order, the Agency will send, by first class mail, overnight delivery service or hand delivery, a SF 329A (Letter to Employer & Important Notice to Employer), a SF 329B (Wage Garnishment Order), a SF 329C (Wage Garnishment Worksheet), and a SF 329D (Employer Certification), to the debtor's employer—
1. (1) Within 30 days after the debtor fails to make a timely request for a hearing (i.e., within 15 business days after the mailing of the notice described in § 105-57.004(a) of this part); or
2. (2) If a timely request for a hearing is made by the debtor, within 30 days after a final decision is made by the hearing official to proceed with garnishment.
(b) The withholding order sent to the employer under paragraph (a) of this section will contain the signature of, or the image of the signature of, the Administrator or his or her delegate. The order will contain only the information necessary for the employer to comply with the withholding order. Such information includes the debtor's name, address, and social security number, as well as instructions for withholding and information as to where payments are to be sent.
(c) GSA will retain a copy of the evidence of service indicating the date of submission of the order. The evidence of service may be retained electronically so long as the manner of retention is sufficient for evidentiary purposes.