What is the proper action to take immediately after a spill or overfill?

The proper action to take immediately after a spill or overfill is to stop the flow of product. This is crucial because halting the flow prevents further spillage and minimizes environmental hazards or contamination. By stopping the source of the spill, you quickly reduce the potential damage and danger to people and the environment.

Following this initial action, other steps such as notifying local authorities, initiating cleanup efforts, and documenting the incident become important but are usually secondary to stopping further product release. The priority is to manage the immediate risk first, ensuring that the situation does not worsen while you address the spill. This sequence of actions is key to effective incident management in underground storage tank operations.