At what point in the installation procedure should the air/soap test be performed?

The air/soap test is a crucial step in ensuring the integrity of the underground storage tank system prior to the tank being put into service. Conducting this test during the pre-installation phase allows for the detection of any leaks or issues with the tank before it is buried or otherwise sealed in place. This proactive measure is vital for compliance with safety regulations and helps prevent potential environmental contamination. By assessing the tank's condition early in the installation process, any necessary corrections or adjustments can be made to ensure it operates reliably and safely once installed.

Conducting the air/soap test post-installation would not be ideal, as it would not prevent the tank from potentially being buried with existing issues. Testing during installation or before delivery is also not the typical procedure, as the integrity checks are primarily focused on ensuring that the tank is leak-free before it is permanently placed in the ground.