Exceedance Ratio

The exceedanceRatio on an Exceedance is calculated as resultConcentration divided by thresholdConcentration. A ratio of 1.5 means the result was 50% above the regulatory limit; a ratio of 10.0 means ten times the limit. This single number lets compliance staff prioritize exceedances by severity at a glance — higher ratios typically warrant faster regulatory notification and more aggressive corrective action. Trend analysis of exceedanceRatio over successive sampling events also shows whether concentrations at a well are improving toward the cleanup goal or worsening.