Which method is NOT a part of the closure procedure for a tank?

One critical aspect of the closure procedure for an underground storage tank (UST) is ensuring the tank is safely and appropriately decommissioned to prevent environmental contamination. This involves several specific steps, including the removal of all liquids and sludge, sealing the tank, and filling it with inert solids when necessary.

Leaving the tank filled with product conflicts with the closure regulations that mandate the removal of any hazardous materials to mitigate risks such as leaks, spills, or groundwater contamination. Ensuring that tanks are empty of all contents is essential for compliance with environmental safety standards and for safeguarding public health. The closure process must seal the tank and address any potential containment risks, making the approach of leaving product inside fundamentally inappropriate.