Environment (E)

Consequence Description

Probability of Failure

5

(occurs ≥ 5 times in a maintenance cycle)

4

(occurs 4 times in a maintenance cycle)

3

(occurs 3 times in a maintenance cycle)

2

(occurs 2 times in a maintenance cycle)

1

(occurs 0 - 1 time in a maintenance cycle)

Catastrophic (5)

Persistent and landscape scale environmental impact or loss of a significant portion of a valued species

25

20

15

10

5

Severe (4)

Impacts such as long-term and widespread environmental degradation

20

16

12

8

4

Major (3)

Impacts such as short term and widespread environmental degradation

15

12

9

6

3

Moderate (2)

Impacts such as localized and long-term environmental degradation

10

8

6

4

2

Minor (1)

Impacts such as localized and short-term environmental degradation

5

4

3

2

1