California ICC UST Service Technician Practice Exam

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Prepare for the California ICC UST Service Technician Exam with our engaging quiz. Test your knowledge using a variety of questions, including multiple-choice and flashcards. Each question is accompanied by helpful hints and detailed explanations to boost your understanding.

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A positive shut-off overfill protection device must stop the flow of fuel when the tank is no more than __________ percent full.

The correct answer is: 95

A positive shut-off overfill protection device is designed to prevent overfilling of underground storage tanks (USTs) by stopping the flow of fuel before the tank reaches its maximum capacity. The requirement for such a device is to halt the flow when the tank is no more than 95 percent full. This threshold is established to give a safety margin for potential expansion of the fuel, which can occur due to temperature changes or other environmental factors, thus reducing the risk of spills and ensuring compliance with environmental protection regulations. By stopping the fuel flow at 95 percent, the device ensures that there is sufficient space in the tank to accommodate any variations in fuel volume, which helps prevent overfilling and potential hazards associated with leaks or spills. This is why the answer indicating a 95 percent fill is the correct choice, as it adheres to established safety standards for UST management.