What requirement is not associated with vaulted tanks for secondary containment?

Vaulted tanks are designed to provide secondary containment, which is a key requirement for ensuring the safe storage of hazardous substances. The primary purpose of secondary containment is to prevent leaks or spills from the main tank into the surrounding environment. By design, vaulted tanks are constructed to help contain any potential leaks that may occur from the primary tank, thus protecting groundwater and surrounding areas from contamination.

The requirement that vaulted tanks do not provide secondary containment is incorrect because their very construction is intended to fulfill that purpose. Additionally, options related to withstanding external pressures, their installation location (either above or below ground), and the need for regular inspection and maintenance reflect important characteristics of vaulted tanks, focusing on safety and regulatory compliance.