California ICC UST Service Technician Practice Exam

Statistical Inventory Reconciliation (SIR) is an approved method for non-visual monitoring of existing underground storage tank (UST) systems primarily because it uses mathematical calculations to detect leaks in the tank system without requiring visual inspections. SIR involves a statistical analysis of inventory data, deliveries, and product dispensed over time, allowing operators to identify inconsistencies that may indicate a potential leak. This method can provide a level of confidence about the integrity of the tank system, enabling more efficient monitoring compared to purely visual methods. While manual inventory reconciliation can also be a monitoring technique, it often relies on manual data handling and is less robust than SIR due to its susceptibility to human error. Visual inspection is not classified as a non-visual method, as it requires direct observation of the equipment. Daily checklists can help track certain conditions but do not typically provide a comprehensive analysis for detecting leaks in the same statistically reliable manner that SIR does. Thus, SIR stands out as an effective approved method for ensuring the safety and compliance of existing UST systems.