groundwater quality in B1 is rated Grade III according the standard for nitrate
nitrogen. Overall, the groundwater quality of the given landfill is good.
(4) Groundwater pollution source intensity evaluation
Using the method described in Sect. 3.2.2.2, indicator-specific scores are given: 10
for landfill volume (Y1) which reaches 120 Â 10
4 m
3 ; 1 for landfill period (Y2)
spans 19 years; 8 for landfill type (Y4) as mainly MSW is landfilled; 8 for maximum leachate production (Y3) which attains 9 Â 10
4 m
3 /a; 10 for seepage control
(Y5) which relies on the natural soil layer; and 4 for leachate treatment (Y6) as there
is only collection system.
Table 5.5 (continued)
Indicators
Groundwater quality standards
Grade I
Grade II
Grade III
Grade IV
Grade V
Lead
0.005
0.005
0.01
0.10
>0.10
Mercury
0.0001
0.0001
0.001
0.002
>0.002
Iron
0.1
0.2
0.3
2.0
>2.0
Manganese
0.05
0.05
0.10
1.50
>1.50
Benzene
0.5
1.0
10.0
120
>120
Toluene
0.5
140
700
1400
>1400
Ethylbenzene
0.5
30.0
300
600
>600
Xylene
0.5
100
500
1000
>1000
Styrene
0.5
2.0
20.0
40.0
>40.0
1,2-dichloropropane
0.5
0.5
5.0
60.0
>60.0
Vinyl chloride
0.5
0.5
5.0
90.0
>90.0
1,1-dichloroethylene
0.5
3.0
30.0
60.0
>60.0
Dichloromethane
1
2
20
500
>500
1,2-dichloroethylene
0.5
5.0
50.0
60.0
>60.0
1,1,1-trichloroethane
0.5
400
2000
4000
>4000
Carbon tetrachloride
0.5
0.5
2.0
50.0
>50.0
1,2-dichloroethane
0.5
3.0
30.0
40.0
>40.0
Trichloroethylene
0.5
7.0
70.0
210
>210
1,1,2-trichloroethane
0.5
0.5
5.0
60.0
>60.0
Tetrachloroethylene
0.5
4.0
40.0
300
>300
Chlorobenzene
0.5
60.0
300
600
>600
1,4-dichlorobenzene
0.5
30.0
300
600
>600
1,2-dichlorobenzene
0.5
200
1000
2000
>2000
Trichlorobenzene
0.5
4.0
20.0
180
>180
Tribromomethane
0.5
10.0
100
800
>800
BaP
0.002
0.002
0.01
0.50
>0.50
Note The unit for water quality indicators except pH is mg/L
104
5 Application Cases