Sampling point

OI

Evaluation grade

FF

Evaluation grade

Mainstream

G1

0.155

II

1.99

III

G2

0.096

II

1.67

III

G3

0.106

II

1.82

III

G4

0.043

I

1.09

II

G5

0.036

I

1.02

II

G6

0.102

II

1.81

III

G7

0.041

I

1.02

II

Tributary

Z1

0.076

II

1.39

II

Z2

0.070

II

1.32

II

Z3

0.068

II

1.29

II

Z4

0.090

II

1.71

III