Which of the following is NOT an acceptable way to decommission an underground storage tank?

Decommissioning an underground storage tank (UST) involves procedures that ensure safety and environmental protection. The practice of draining the oil and doing nothing else is considered inappropriate and non-compliant with regulations.

Leaving a tank in place after simply draining it poses several risks. First, there is potential for residual contaminants to remain, which can contaminate the soil and groundwater. Regulatory agencies require that USTs be thoroughly managed to prevent potential leakage or environmental hazards.

Acceptable methods of decommissioning involve more proactive measures. For instance, physically removing the tank from the site ensures that no contaminants can leak out over time. Other methods, such as filling the tank with sand or gravel or slurry, are designed to provide structural support and mitigate the risk of collapse while also containing any residual materials that might pose a risk.

Therefore, simply draining the tank and not taking further action is not an acceptable method for decommissioning an underground storage tank, as it does not sufficiently address environmental safety and the prevention of potential leaks or contamination.