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 |