Exceedance Threshold Concentration

The thresholdConcentration on an Exceedance preserves the exact regulatory limit that was used in the comparison when the violation was detected. This snapshot is important because ThresholdValues can be updated over time as regulations change. By capturing thresholdConcentration directly on the Exceedance record, Piper ensures that compliance reports accurately reflect what standard applied at the time of detection, even if the ThresholdValue in the system has since been revised. This is essential for historical audits and multi-year compliance trend analysis.