Table 5.41
Test results for groundwater quality of the Dachaidan Landfill
Items
Unit
Central part of the alluvial-pluvial fan
Central and front parts of the alluvial-pluvial fan
Monitoring
well#1
Monitoring
well#2
Monitoring
well#3
Monitoring
well#4
Monitoring
well#5
Monitoring
well#6
Monitoring
well#7
Monitoring
well#8
Monitoring
well#9
Monitoring
well#10
Flavor level
/
No
No
No
No
No
No
No
No
No
No
Macroscopic
objects
/
N o
N o
N o
N o
N o
N o
N o
N o
N o
N o
pH
/
7.86
7.82
7.85
7.90
8.22
8.01
8.42
8.13
8.16
8.29
Total salinity
mg/L
257
701
821
463
422
661
410
412
368
451
Total hardness
(CaCO
3 )
mg/L
101
202
267
150
180
244
89
109
131
182
Sulfate
mg/L
46.68
104.57
90.11
150
62.95
174.29
89.08
42.69
79.56
78.31
Chloride
mg/L
28.33
102.5
131.62
57.92
68.44
117.41
61.50
60.26
31.91
67.29
Copper
mg/L
<0.008
/
/
/
/
/
/
<0.008
<0.008
<0.008
Lead
mg/L
<0.01
/
/
/
/
/
/
<0.005
<0.005
<0.01
Zinc
mg/L
<0.002
/
/
/
/
/
/
0.0048
0.0044
<0.002
Nitrate (in
nitrogen terms)
mg/L
2.96
/
/
/
/
/
/
/
2.14
3.35
Nitrite (in
nitrogen terms)
mg/L
<0.1
/
/
/
/
/
/
/
0.02
0.43
Ammonia ion
mg/L
0.06
/
/
/
/
/
/
/
0.18
<0.02
Fluoride
mg/L
1.29
/
/
/
/
/
/
/
0.21
0.93
Iron (Fe
2+
)
mg/L
<1.5
/
/
/
/
/
/
/
<0.05
0.07
Iron (Fe
2+
)
mg/L
<1.5
/
/
/
/
/
/
/
0.05
0.05
Volatile phenols
mg/L
<0.002
/
/
/
/
/
/
/
/
/
Cyanide
mg/L
<0.002
/
/
/
/
/
/
/
/
/
Arsenic
mg/L
/
/
/
/
/
/
/
/
/
/
Chromium
(hexavalent)
mg/L
/
/
/
/
/
/
/
/
/
/
(continued)
5.2 Northwest China
175