Under which regulation are hazardous materials required to be reported when exceeding a specific volume in 24 hours?

The correct regulation that requires the reporting of hazardous materials when they exceed a specific volume within a 24-hour period is indeed found in 40 CFR part 302. This regulation is part of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and focuses on the mandatory reporting of releases of hazardous substances into the environment.

When certain hazardous substances exceed designated reportable quantities, the responsible parties must notify authorities, including the National Response Center (NRC). This requirement is crucial for ensuring timely responses to hazardous releases, helping to minimize environmental and public health risks. The specific focus on hazardous materials and the importance of reporting their releases within a defined timeframe underscores the regulation's role in environmental protection and public safety.

In contrast, the other options pertain to different regulatory frameworks. For example, 43 CFR part 11 relates to the restoration of natural resources in the context of environmental damage assessments, while 15 CFR part 990 deals with the National Oceanic and Atmospheric Administration (NOAA) and specific recovery approaches related to natural resource damage claims. RCRA (Resource Conservation and Recovery Act) regulates the management and disposal of solid and hazardous waste but does not specifically focus on the immediate reporting of hazardous material releases as defined in 40 CFR