After making the required phone notification to the National Response Center (within 12 hours of a reportable incident), what additional step does a carrier involved in a reportable hazmat incident have under federal law?

49 CFR 171.16 (Detailed hazardous materials incident reports)

Treating the phone call as the only obligation is a common and costly mistake. Carriers that skip the follow-up Form 5800.1 can be cited for a separate violation even though they called the NRC correctly at the time of the incident.