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When statistical inventory reconciliation (SIR) is employed as a method for monitoring tank integrity, the regulatory requirement is that a tank integrity test must be conducted every 2 years. This frequency is established to ensure that potential leaks or integrity issues are detected promptly, while balancing the need for financial and operational feasibility for tank operators. The 2-year interval allows for a thorough analysis of inventory data to verify that the tank system is functioning correctly and not experiencing any leaks.

This approach relies on statistical methods to analyze trends in product inventory and can identify issues that might suggest a potential leak. However, since it's a method based on data analysis rather than direct physical testing, regular testing every 2 years is considered a safe interval for more comprehensive evaluations of tank integrity. This timing ensures compliance with environmental regulations and enhances safety by reducing the risk of undetected leaks over extended periods.