California ICC UST Service Technician Practice Exam

What is the minimum leak detection threshold for an automatic line leak detector?

1. 0.1 gallons per hour

2. 0.2 gallons per hour

3. 0.3 gallons per hour

4. 0.5 gallons per hour

The correct answer is: 0.2 gallons per hour

The minimum leak detection threshold for an automatic line leak detector is typically set at 0.2 gallons per hour. This threshold is established to ensure that any leaks within a fuel storage system are detected promptly, in order to prevent environmental contamination and product loss. Automatic line leak detectors are designed to monitor the integrity of underground storage tank systems and to alert operators whenever the rate of leakage exceeds this defined threshold. Setting the threshold at 0.2 gallons per hour strikes a balance between sensitivity and practicality. A lower threshold could lead to frequent alarms for minor fluctuations that are not necessarily indicative of a true leak, potentially causing unnecessary disruptions and investigations. Conversely, a higher threshold may delay the detection of actual leaks, allowing more significant issues to arise before detection occurs. Therefore, the 0.2 gallons per hour standard ensures an effective monitoring system that protects both the environment and the interests of facility operators. The other options, while they present different thresholds, are either too high or too low compared to the regulations and best practices surrounding the operation of automatic line leak detectors.