California ICC UST Service Technician Practice Exam

What percentage must a tank be tested for leak detection when filled within the highest operating level from the previous month?

1. 5%

2. 10%

3. 15%

4. 20%

The correct answer is: 10%

The correct percentage for leak detection testing when a tank is filled to the highest operating level from the previous month is indeed 10%. This requirement is grounded in the principles of ensuring the environmental safety and integrity of underground storage tanks. When a tank is filled to a level that reflects the highest operational capacity, it's essential to test for leaks at a rate that can effectively indicate any loss of product, which may suggest a breach in the tank or associated piping. Testing at this percentage helps to mitigate the risk of environmental contamination and ensures compliance with regulatory standards. In many jurisdictions, including California, the 10% threshold has been adopted because it strikes a balance between operational practicality and effective leak detection. By identifying leaks at this level, tank operators can address potential issues before they lead to significant environmental harm or costly clean-up efforts. This level of diligence is crucial, as leaks can have serious implications for surrounding ecosystems and public health. Maintaining adherence to these testing requirements is a critical aspect of responsible tank management, aligning with best practices for environmental protection and regulatory compliance.