California ICC UST Inspector Practice Exam 2025 – Your All-In-One Guide to Exam Success!

Statistical inventory reconciliation (SIR) is a method used to assess the integrity of underground storage tanks (USTs) by comparing the amount of product that is delivered to the tank against the amount that is dispensed and the readings taken from the tank. Conducting SIR on a monthly basis provides a more frequent assessment of any discrepancies that may indicate a leak or maintenance issue.

The requirement for monthly reconciliation aligns with regulations that aim to ensure the ongoing safety and environmental protection of UST systems. By performing SIR at least once per month, operators can promptly identify potential leaks or inventory anomalies, supporting proactive management of USTs and adherence to safety standards.

This regular monitoring is critical because failure to detect leaks in a timely manner could result in environmental contamination and pose risks to public health. Thus, the choice stating that statistical inventory reconciliation shall be conducted at least once per month is accurate and reflects regulatory requirements for UST operations.