What is the required thickness of secondary containment for underground fuel tanks?

The required thickness of secondary containment for underground fuel tanks is established to ensure adequate protection against leaks and spills, which can pose serious environmental hazards. A thickness of 6 inches provides a sufficient barrier to contain any potential leakage from the primary tank. This thickness is designed to withstand various physical and chemical stresses that may occur in real-world scenarios, thereby enhancing the overall safety and integrity of the fuel storage system.

Furthermore, the 6-inch specification is consistent with industry standards and regulations that focus on preventing soil and groundwater contamination. Ensuring that secondary containment is robust enough is critical for effective environmental management and compliance with safety regulations. This thickness not only serves to contain potential spills but also allows for the necessary structural support to accommodate the weight and pressures associated with the stored fuel over time.