In most states, acceptable leak detection for newly installed underground tanks is limited to what methods?

The correct response highlights the standard methods used for detecting leaks in newly installed underground storage tanks (USTs), which are line leak detection and interstitial monitoring. Line leak detection involves monitoring the product lines connected to the tank to identify any leaks that might occur along these pathways. This method is crucial because it helps to ensure the integrity of the fuel system and minimize environmental impact.

Interstitial monitoring, on the other hand, involves checking the space between the outer wall of the UST and its secondary containment layer. This method allows for the detection of leaks from the tank or the piping system before any product escapes into the surrounding environment. Utilizing both these methods provides a comprehensive approach to leak detection, creating a multi-layered system that enhances safety and compliance with environmental regulations.

The other methods of leak detection mentioned in the incorrect choices do not align with the industry standards for newly installed tanks. For instance, pressure testing and visual inspection might be applicable in certain contexts, but they are not the primary methods mandated for leak detection in USTs. Similarly, soil testing and water sampling are generally used for monitoring existing contamination rather than for ongoing leak detection in new installations. Magnetic detection and RFID tracking are also not recognized as standard methods for leak detection in USTs as they