D.C. Mun. Regs. tit. 3, r. 3-3712
The Director shall determine whether a contribution made to a person was in excess of the aggregate maximum to which the person was entitled.
Upon a determination that an excessive contribution has been made, the Director shall, in writing, notify the recipient of the excessive contribution of:
Any person required by the Director to repay an excess contribution may apply in writing to the Director for an extension of time in which to repay the excess contribution.
The Director may grant an extension for a reasonable amount of additional time for good cause to any person who files an application in accordance with § 3712.3.
If the person who has been determined to have received an excessive contribution disputes the Director's determination, the person shall so advise the Director in writing within seven (7) days upon receipt of the notice issued under § 3712.2.
Within ten (10) days after receiving notice of the existence of the dispute pursuant to § 3712.5, the Director shall schedule and conduct an informal hearing in accordance with § 3709.
With the exception of § 3712.2, when a candidate seeking certification or participating in the Fair Elections Program knows or has reason to know that he or she has accepted a contribution, contributions, or aggregate contributions from a single source in excess of the applicable contribution limits under § 4205.1, or from prohibited sources, the candidate shall promptly return the excess portion or prohibited contribution, by bank check or certified check made out to the contributor in accordance with §§ 4205.15, 4205.16 and 4207.9.
D.C. Mun. Regs. tit. 3, r. 3-3712