What procedure must be followed to permanently close a tank?

To permanently close an underground storage tank (UST), the procedure typically requires that the tank be removed from the ground. This approach is essential to ensure that the tank does not pose any environmental risks in the future, such as leaks or contamination of groundwater. When a tank is removed, it allows for a thorough inspection and opportunity to address any potential contamination issues that may have resulted from the tank's previous use.

Additionally, once the tank is removed, the area can be properly assessed and remediated if necessary, further protecting the environment and public health. Properly documenting the removal process is also a critical requirement to comply with regulations regarding UST closure.

Alternatives like filling the tank with water or sealing it with concrete can leave potential hazards in place and may not be acceptable methods for permanent closure under regulatory standards. Leaving a tank in place, even if structurally sound, does not adequately mitigate the risks of leaks or contamination that can occur over time. Therefore, removing the tank from the ground remains the appropriate procedure for permanent closure.