Table 4.8 – The Action and Limit Levels for Water Quality

Monitoring Location

Monitoring Level

DO
(mg/L)

Turbidity
(NTU)

Total Suspended Solids
(mg/L)

AL

LL

AL (95%-ile)

LL (99%-ile)

AL (95%-ile)

LL (99%-ile)

M1

*S&M

2.25

1.91

48.4

50.4

59

68

B

NA

NA

M2

*S&M

1.88

1.79

43.0

52.4

81

112

B

NA

NA

M3

*S&M

3.28

3.14

74.3

78.0

104

167

B

NA

NA

E1

**S&M

3.25

2.60

45.2

47.2

62

83

B

2.38

2.00b

E2a

*S&M

3.86

3.72

44.1

45.5

63

65

B

NA

NA

E3a

*S&M

7.26

4.00a

27.5

29.8

45

61

B

NA

NA

E4

*S&M

3.23

2.74

38.2

40.2

51

66

B

NA

NA

E5a

S&M

2.01

1.88

36.7

39.8

59

63

B

5.65

2.00b

DB1

*S&M

7.52

4.00a

17.7

27.4

41

78

B

NA

NA

SP1

*S&M

1.31

1.22

52.1

52.5

66

150

B

NA

NA

KT1

S&M

2.80

2.34

42.6

44.7

56

72

B

5.29

2.00b

Notes:

1. The values are calculated and presented in depth-average, except for DO;

2. Monitoring level: S&M – Surface and Middle; B – Bottom;

(* For M1, M2, M3, E2a, E3a, DB1 and SP1 the water depth is less than 3m, only value at the middle was taken in the baseline monitoring;

** For E1 the water depth is between 3m to 6m, only value at Surface was taken in the baseline monitoring.)

3. NA refers to “Not Applicable” as monitoring is not applicable for that water level;

a.  Four (4) mg/L will be adopted as the Limit Level (LL) of DO (S&M) at E3a and DB1 since the 1%-ile of baseline data for surface and middle layer is greater than 4 mg/L;

b. Two (2) mg/L will be adopted as the Limit Level (LL) of DO (B) at E1, E5a and KT1 since the 1%-ile of baseline data for bottom layer is greater than 2 mg/L.