Table 5.127
Assessment results of groundwater environmental quality in low
flow period
S/N Test item
Class III standard value in
Quality Standard for
Groundwater
1#
2#
4#
6#
7#
Monitored
value
Standard
index
Monitored
value
Standard
index
Monitored
value
Standard
index
Monitored
value
Standard
index
Monitored
value
Standard
index
1
pH (dimensionless)
6.5–8.5
7.44
0.293
6.82
0.36
7.17
0.11
6.78
0.44
7.03
2
Sulfate, mg/L
250
139
0.556
85.2
0.34
35.4
0.1416
235
0.94
47.4
0.1896
3
Chloride, mg/L
250
278
1.112
125
0.5
10.2
0.04
120
0.48
255
1.02
4
Chroma, degrees
15
<5
0
<5
0
<5
0
<5
0
<5
0
5
Turbidity, NTU
3
< 1
0
< 1
0
< 1
0
< 1
0
< 1
0
6
Total hardness,
mg/L
450
442
0.98
559
1.24
263
0.584
939
2.09
394
0.876
7
Total dissolved
solids, mg/L
1000
919
0.92
862
0.86
396
0.4
1.92
 103 1.92
478
4.78
8
Permanganate
index, mg/L
3.0
2.97
0.99
1.78
0.59
1.6
0.53
10.7
3.57
2.35
0.78
9
Nitrate nitrogen,
mg/L
20
4.56
0.23
6.71
0.34
4.13
0.21
6.88
0.34
0.692
0.03
10
Nitrite nitrogen,
mg/L
0.02
0.03
1.5
0.001
0.05
0.002
0.1
0.004
0.2
0.606
30.3
11
Ammonia-nitrogen,
mg/L
0.2
0.023
0.12
0.032
0.16
0.026
0.13
0.038
0.19
0.026
0.13
12
Fluoride, mg/L
1.0
1.15
1.15
0.451
0.45
0.97
0.97
0.481
0.48
0.803
0.8
13
Total coliforms,
MPN/L
3.0
Not
detected
0
Not
detected
0
Not
detected
0
Not
detected
0
Not
detected
0
14
Total number of
bacterial, cfu/mL
100
5.6
 102
5.6
57
0.57
2.1
 103
2.1
1.4
 104
140
4.5
 102
4.5
15
Zinc, mg/L
1.0
<0.001
0
<0.001
0
<0.001
0
<0.001
0
<0.001
0
16
Copper, mg/L
1.0
<0.009
0
<0.009
0
<0.009
0
<0.009
0
<0.009
0
17
Arsenic, mg/L
0.05
0.0024
0.048
<0.0005
0
<0.0005
0
0.0125
0.25
<0.0005
0
376
5 Application Cases