Which type of testing is used to assess the integrity of USTs?

Tightness testing and integrity testing are essential methods used to assess the integrity of underground storage tanks (USTs). These tests help to ensure that the tanks are secure and do not have any leaks that could lead to environmental contamination.

Tightness testing evaluates the tank's ability to hold its contents without any loss, while integrity testing involves more comprehensive assessments that may include pressure testing or electronic monitoring systems to detect any potential leaks or structural weaknesses. Together, these testing methods provide a robust approach to understanding the condition and safety of USTs, contributing to the protection of both public health and the environment.

The other options do not adequately address the specific needs for assessing UST integrity. Weather resistance testing focuses on a structure’s ability to withstand environmental factors, which does not pertain directly to leaks or structural integrity. Visual inspections, while useful for identifying obvious external damage or corrosion, are insufficient alone to determine if a UST is leaking internally. Heat resistance testing is not relevant to the typical integrity concerns of USTs, as it deals with a tank's ability to withstand high temperatures and does not provide insights into potential leaks or failures in a tank's integrity.