D.C. Mun. Regs. tit. 8-B, § 3309
3309.1 If a proposal, modification of a proposal, or withdrawal of proposal is received late and it is clear from available information that it cannot be considered, the contracting officer shall promptly notify the offeror.
3309.2 If a late proposal, late modification of proposal, or withdrawal of proposal is transmitted by registered or certified nail and is received before award, but it is not clear from available information whether it can be considered, the offeror shall be promptly notified.
SOURCE: Final Rulemaking published at 39 DCR 2566 (April 10, 1992).