California ICC UST Service Technician Practice Exam

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What is the required leak detection rate for an ATG testing the tank?

1.0 gph
0.5 gph
0.2 gph
0.1 gph

The correct answer is: 0.2 gph

The required leak detection rate for an Automatic Tank Gauge (ATG) testing a tank is set at 0.2 gallons per hour (gph). This standard is established to ensure that any potential leaks are detected effectively and promptly, minimizing environmental contamination and operational risks. The 0.2 gph rate is particularly important as it balances detection sensitivity with practicality. It allows for the identification of leaks that could pose a risk without being overly conservative, which might lead to unnecessary and costly investigations or tank downtimes. In comparison, higher leak detection rates (like 1.0 gph or 0.5 gph) may not provide adequate sensitivity for smaller leaks, potentially allowing significant issues to go unnoticed. Lower rates, such as 0.1 gph, while providing excellent sensitivity, could lead to false positives or excessive scrutiny for minimal risks, which could be economically unfeasible for operations. Therefore, the standard of 0.2 gph serves as an industry benchmark to maintain safety while ensuring operational efficiency.