6.4 Water Quality Monitoring.

Water quality in terms of suspended solids, temperature and zinc, was carried out on fourteen occasions at WMS3 (downstream station). As the upstream of the channel was diverted, the designated station WMS1 (Upstream station) could not represent the water quality of the upstream sections. The 95 percentile of the baseline data (29 mg/L) was act as a upstream control station to set the Trigger / Action / Target level of suspended solids.

The summary of results for water quality monitoring is summarized in the following tables. Detailed monitoring results are presented in Appendix VI. Graphical presentation of the suspended solids is shown in Figure 6.4.

Table 6.5 – Summary of Water Quality Monitoring Data (SS)

Date

Baseline Trigger, Action & Target Level

(mg/L)

Daily Trigger Level

(mg/L)

Daily Action

Level

(mg/L

WMS3

SS, (mg/L)

Exceedance (Y/N)

02-Jan-03

18

35

38

33

N

04-Jan-03

18

35

38

33

N

07-Jan-03

18

35

38

30

N

09-Jan-03

18

35

38

22

N

11-Jan-03

18

35

38

25

N

14-Jan-03

18

35

38

27

N

16-Jan-03

18

35

38

24

N

18-Jan-03

18

35

38

33

N

21-Jan-03

18

35

38

30

N

23-Jan-03

18

35

38

31

N

25-Jan-03

18

35

38

28

N

27-Jan-03

18

35

38

26

N

28-Jan-03

18

35

38

29

N

30-Jan-03

18

35

38

34

N

Table 6.6 – Summary of Water Quality Monitoring Data (Zn)

Date

Trigger Level

Action Level

Target Level

WMS3

Zn, (mg/L)

Exceedance (Y/N)

02-Jan-03

-

-

-

<0.05

N

04-Jan-03

-

-

-

<0.05

N

07-Jan-03

-

-

-

<0.05

N

09-Jan-03

-

-

-

<0.05

N

11-Jan-03

-

-

-

<0.05

N

14-Jan-03

-

-

-

<0.05

N

16-Jan-03

-

-

-

<0.05

N

18-Jan-03

-

-

-

<0.05

N

21-Jan-03

-

-

-

<0.05

N

23-Jan-03

-

-

-

<0.05

N

25-Jan-03

-

-

-

<0.05

N

27-Jan-03

-

-

-

<0.05

N

28-Jan-03

-

-

-

<0.05

N

30-Jan-03

-

-

-

<0.05

N

Note: The levels of Suspended Solids (SS) and Zinc (Zn) are the averaged of duplicate samples.