49 CFR § 192.949 - How does an operator notify PHMSA?
An operator must provide any notification required by this subpart by -
(a) Sending the notification by electronic mail to InformationResourcesManager@dot.gov; or
(b) Sending the notification by mail to ATTN: Information Resources Manager, DOT/PHMSA/OPS, East Building, 2nd Floor, E22-321, 1200 New Jersey Ave. SE., Washington, DC 20590.