What is the general timeline for reporting a UST release?

The correct answer is 24 hours after discovery because regulations governing underground storage tanks (USTs) require that any release of regulated substances be reported to the appropriate authorities promptly to mitigate potential environmental damage. Timely reporting allows for immediate investigation and remediation efforts to begin, reducing the risk of contamination to soil and groundwater.

This requirement is critical for ensuring that necessary protective measures are taken to safeguard public health and the environment. The 24-hour window is specified to ensure that owners and operators of USTs act swiftly in response to a release, reflecting the urgency of addressing potential contamination.

While other options suggest various timelines, none align with the regulatory requirement mandating reporting within a one-day timeframe. This is crucial within the context of maintaining safety and compliance in UST operations.