Table 5.46
Results of groundwater pollution evaluation of the Dachaidan Landfill (ctd)
No Items
Unit Monitoring well#3
Water source well
Before the
landfill was
built
After the
landfill was
built
Grade
III
limits
P
Pollution
level
Before the
landfill was
built
After the
landfill was
built
Grade
III
limits
P
Pollution
level
1
NH
4
+
mg/L 0.02
0.02
0.5
0
I
–
0.02
0.5
0
I
2
Cl
−
mg/L 67.29
45.75
250
−0.09 I
117.41
118.2
250
0
I
3
SO
4
2−
mg/L 78.31
139.6
250
0.25
III
174.29
189.7
250
0.06
II
4
F
−
mg/L 0.43
1.12
1
0.69
IV
–
0.82
1
0
I
5
NO
3
−
mg/L 0.93
4.28
20
0.17
II
–
8.59
20
0
I
6
NO
2
−
mg/L 3.35
0.01
1
−3.34 I
–
0.02
1
0
I
7
I
−
mg/L
–
0
0.08
0
I
–
<0.001
0.08
0
I
8
Metasilicate
(H
2 SiO
3 )
mg/L 9.42
7.88
1000
0
I
–
14.99
1000
0
I
9
Chemical
oxygen demand
(COD)
mg/L 0.36
1.8
3
0.48
III
–
0.34
3
0
I
10 Total hardness
(CaCO
3 )
mg/L 182
135.4
450
−0.10 I
244
214.8
450
−0.06 I
11 Cu
lg/L 8
2.45
1000
−0.01 I
–
2.7
1000
0
I
12 Pb
lg/L 10
1
10
−0.90 I
–
1
1 0
0
I
13 Zn
lg/L 2
10
1000
0.01
II
–
10
1000
0
I
14 Cd
lg/L 3.4
1
5
−0.48 I
–
1
5
0
I
15 As
lg/L 0.05
1
10
0.10
II
–
1
1 0
0
I
16 Hg
lg/L –
0.1
1
0
I
–
0.1
1
0
I
17 Se
lg/L –
1
1 0
0
I
–
1
1 0
0
I
18 Mn
lg/L –
0.33
100
0
I
–
1
100
0
I
19 Cr
6+
lg/L 4
4
50
0
I
–
4
5 0
0
I
Comprehensive evaluation
Level IV, high pollution
Level II, no pollution
182
5 Application Cases