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Table 1 Summary of water quality data for Cusheon Lake (EMS site 1100123)

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Water Quality

Average

Std Dev.

Number of

Maximum

Minimum

Indicator

   

samples

   

SPRING OVERTURN

         

MONITORING

         

Water Clarity and Colour

         

Turbidity (NTU)

2.9

2.48

35

12

0.6

Colour, true (TCU)

18.2

11.26

30

60

5

Extinction depth (m)

3.13

1.48

18

5.40

1

General Ions

         

pH (pH units)

7.14

0.26

53

7.7

6.7

Residues, total (mg/L)

82

6.8

31

106

72

Specific conductivity (_S/cm)

85.9

19.4

87

134

58

Calcium, total (mg/L)

10.38

1.18

24

14.1

8.29

Chloride, dissolved (mg/L)

8.91

2.45

19

14.9

5.7

Magnesium, total (mg/L)

2.69

0.21

24

3.11

2.22

Potassium, dissolved (mg/L)

0.46

0.078

7

0.6

0.4

Silica, dissolved (mg/L)

8.86

1.66

24

11.6

5

Sulphate, Dissolved (mg/L)

10.72

1.01

14

12.8

9.5

Tannin & Lignin (mg/L)

0.68

0.282

18

1.3

L 0.2

Temperature, water (O C)

9.04

3.8

116

16.6

1.5

Alkalinity (mg/L)

24.4

5.6

33

48.4

18.9

Hardness as CaCO3 (mg/L)

38.1

3.3

9

46.7

36.1

Nutrients

         

Carbon, total organic (mg/L)

6.55

1.72

40

12

3

Carbon, total inorganic (mg/L)

5.85

2.08

34

15

2

Nitrogen, ammonia (mg/L)

0.045

0.12

43

0.8

L 0.005

Nitrogen, Kjeldahl (mg/L)

0.41

0.175

62

1.15

0.18

Nitrogen, organic (mg/L)

0.46

0.161

26

0.82

0.22

Nitrogen, Nitrate (mg/L)

0.69

0.205

36

1.15

0.24

Nitrogen, Nitrate+Nitrite (mg/L)

0.291

0.021

62

0.65

L 0.02

Total Phosphorus (mg/L)

0.028

0.046

62

0.368

L 0.003

Phosphorus, ortho (mg/L)

0.01

0.034

47

0.239

L 0.003

Phosphorus, total dissolved (mg/L)

0.015

0.034

53

0.256

L 0.003

Oxygen, dissolved (mg/L)

8.96

2.25

109

11.9

0.8

Chlorophyll a (_g/L)*

13.7

10.7

34

34

2.5

Phaeophyton a (_g/L)

0.5

0

25

0.5

0.5

           
           

* Chlorophyll a samples were collected in 1980.

Table 1 Summary of water quality data for Cusheon
Lake (EMS site 1100123)
Continued

Water Quality

Average

Std Dev.

Number of

Maximum

Minimum

Indicator

   

samples

   

Metals

         

Aluminum, total (mg/L)

0.103

0.05

12

0.2

0.06

Boron, total (mg/L)

0.06

0.027

9

0.1

0.031

Barium, total (mg/L)

0.0068

0.0007

9

0.008

0.006

Cadmium, total (mg/L)

0.0015

0.0007

15

0.002

0.0005

Cobalt, total (mg/L)

   

9

L 0.004

L 0.003

Chromium, total (mg/L)

   

9

L 0.002

L 0.002

Copper, total (mg/L)

0.0016

0.0007

18

0.004

L 0.001

Iron, total (mg/L)

0.23

0.217

18

0.9

0.1

Lead, total (mg/L)

0.014

0.0135

18

0.03

L 0.001

Manganese, total (mg/L)

0.041

0.029

12

0.103

0.02

Molybdenum, total (mg/L)

   

9

L 0.004

L 0.004

Sodium, dissolved (mg/L)

6.11

1.27

15

9.3

4.7

Silicon, total (mg/L)

3.9

0.711

9

4.66

2.7

Sulphur, total (mg/L)

2.90

0.15

3

2.99

2.73

Strontium, total (mg/L)

0.69

0.008

9

0.082

0.056

Thallium, total (mg/L)

0.003

0.001

9

0.007

0.003

Zinc, total (mg/L)

0.007

0.002

18

0.012

0.005

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