What must be reported to the National Response Center according to 40 CFR part 302?

The requirement to report to the National Response Center is primarily related to the release of hazardous substances into the environment. According to 40 CFR part 302, any release of hazardous substances that exceeds specified threshold quantities must be reported. This provision aims to ensure that significant environmental threats are addressed promptly, allowing for appropriate response measures to be implemented.

The reference to "Reasonable Quantity volume" in the context of hazardous waste highlights the focus on quantifiable releases that can impact human health and the environment. Reporting such incidents enables regulatory agencies to mobilize resources for cleanup and mitigation, ultimately serving the public interest by minimizing potential harm from hazardous substances.

The other options do not align with the specific reporting requirements set forth in 40 CFR part 302. The unauthorized use of hazardous materials, exceeding storage capacity, or incidents involving biological agents do not fall under the direct reporting obligations concerning hazardous substance releases as outlined in the regulation. Hence, recognizing the correct reporting criterion is critical for compliance with environmental regulations and the protection of public health and the environment.