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12 | 130-BRT-01-IMOT Risk Calculation Risk Rating Matrix Likelihood Almost certain 5 10 15 20 25 Very Likely 4 8 12 16 20 Likely 3 6 9 12 15 Unlikely 2 4 6 8 10 Rare 1 2 3 4 5 Low Minor Moderate Major Extreme Consequence Risk Rating Critical High Moderate Low 20.00 – 25.00 12.00 – 19.99 5.00 – 11.99 0.00 – 4.99 Likelihood Description (1) Rare Very low probability for unwanted event to occur in the next year (or less than 5% chance of occurrence) (2) Unlikely Low probability for unwanted event to occur in the next year (or 5%-20% chance of occurrence) (3) Likely It is possible for unwanted event to occur in the next year (or 20%-50% chance of occurrence) (4) Very Likely High probability for unwanted event to occur in the next year (or 50%-90% chance of occurrence) (5) Almost Certain Unwanted event is almost certain to happen in the next year (or 90% or greater chance of occurrence) Consequence Description (1) Low No injury or illness (or negligible impact/importance) (2) Minor First aid treatment (no lost time) (or minor impact/importance) (3) Moderate Temporary disability (lost time): Injury/Illness (or moderate impact/importance) (4) Major Serious event / critical injury or illness (or major impact/importance) (5) Extreme Fatality or permanent disability (or extreme impact/importance)