Table 7 Modified degree of contamination classification and their description

1

_mC_d < 1.5

Nil to very low degree of contamination

2

1.5 ≤ _mC_d < 2

Low degree of contamination

3

2 ≤ _mC_d < 4

Moderate degree of contamination

4

4 ≤ _mC_d < 8

High degree of contamination

5

8 ≤ _mC_d < 16

Very high degree of contamination

6

16 ≤ _mC_d < 32

Extremely high degree of contamination

7

_mC_d ≥ 32

Ultra high degree of contamination