33 C.F.R. § 138.60
(c) How to present Applications and other required submissions.
(1) Provide all submissions required by this subpart to the Director, by one of the following four methods:
(iv) By mail, addressed to—
Director, National Pollution Funds Center, ATTN: VESSEL CERTIFICATION, U.S. Coast Guard Stop 7605, 2703 Martin Luther King Jr. Ave. SE, Washington, DC 20593-7605.
(d) Required contents of submissions. Unless otherwise instructed by the Director, all submissions required by this subpart must—
(e) Ensuring the timeliness of submissions; requesting deadline exceptions.