Which installation method dramatically reduces the risk of ground contamination?

The installation method that dramatically reduces the risk of ground contamination is the use of double-walled tanks with interstitial monitoring. This design features two layers of tank walls: an inner tank that holds the fuel and an outer tank that serves as a protective barrier. This configuration significantly minimizes the chance of leaks reaching the surrounding environment.

The interstitial space between the two walls can be monitored for any signs of leakage. If fuel leaks from the inner tank, it can be detected in the interstitial area before it escapes into the ground. This proactive monitoring system is critical in environmental protection, allowing for timely intervention to address any potential contamination issues.

Other methods, such as single-walled tanks, do not provide the same level of safety since they lack the additional barrier that prevents leaks from directly impacting the soil. Similarly, while using plastic rather than metal tanks can have benefits regarding corrosion, it does not inherently include a secondary containment measure. Installing underground pipes also poses risks of leaks that could lead to soil contamination if proper safeguards aren't integrated into the design.