California ICC UST Inspector Practice Exam

Who is responsible for demonstrating that a UST system is compatible with a hazardous substance?

1. Independent testing organization

2. Tank manufacturer

3. State registered professional engineer

4. Owner or operator

The correct answer is: Owner or operator

The owner or operator of the underground storage tank (UST) system holds the responsibility for demonstrating compatibility with any hazardous substance stored within the system. This obligation includes ensuring that the materials used in the UST—such as the tank's construction materials and associated equipment—are suitable for the specific substance being stored. This requirement arises because the owner or operator has direct control over the operational aspects of the UST system. They are tasked with complying with regulations that mandate compatibility assessments. Compatibility is essential to prevent leaks, spills, and environmental harm, as incompatible materials can lead to structural failures. While independent testing organizations, tank manufacturers, and state-registered professional engineers may provide support, guidance, or assessments regarding compatibility, it is ultimately the responsibility of the owner or operator to ensure compliance with these standards and to demonstrate that their UST system can safely handle the hazardous substances being stored.