from 20 to 200. The deterrent performance of vadose zone can be divided into three
grades. The deterrent performance reaches Grade I When DI′ is less than 30% of the
maximum value, Grade II when DI′ is greater than or equal to 30% of the maximum
value and less than 70% of the maximum value, Grade III when DI′ is greater than
or equal to 70% of the maximum value.
DI
0
¼ V Â x 1 Â M þ x 2 Â M 1 þ x 3 Â K 1 þ x 4 Â K 2 þ x 5 Â Kd þ x 6 Â l
ð
Þ
ð3:11Þ
Wherein V, M, M1, K1, K2, Kd and l are the scores of each factor.
A greater DI′ value means worse pollution prevention, higher vulnerability and
higher grade of the vadose zone.
3.2.4 Rating and Evaluation of Groundwater Pollution
Source Intensity
The evaluation of groundwater pollution source intensity needs to comprehensively
consider the characteristics of both pollution sources and vadose zones. Matrixes
are built to reflect, in a concise and intuitive way, the coupling effects of these
characteristics on groundwater pollution source intensity, with results as shown in
Table 3.13. Higher grade denotes higher groundwater pollution source intensity.
Higher grade implies greater impact of pollution sources on groundwater.
Therefore, Grade III contaminated sites are classified for priority pollution control
(hereinafter referred to as “priority sites”), Grade II contaminated sites for regular
pollution control (hereinafter referred to as “regular sites”), and Grade I contaminated sites for general pollution control (hereinafter referred to as “general sites”).
Table 3.13 Groundwater pollution source intensity rating
Grade of groundwater pollution source intensity
Grade of pollution
source hazard
I
II
III
Grade of mitigation performance of vadose zone
I
I
I
II
II
I
II
III
III
II
III
III
3.2 Method of Groundwater Pollution Source Intensity Rating …
61
grades. The deterrent performance reaches Grade I When DI′ is less than 30% of the
maximum value, Grade II when DI′ is greater than or equal to 30% of the maximum
value and less than 70% of the maximum value, Grade III when DI′ is greater than
or equal to 70% of the maximum value.
DI
0
¼ V Â x 1 Â M þ x 2 Â M 1 þ x 3 Â K 1 þ x 4 Â K 2 þ x 5 Â Kd þ x 6 Â l
ð
Þ
ð3:11Þ
Wherein V, M, M1, K1, K2, Kd and l are the scores of each factor.
A greater DI′ value means worse pollution prevention, higher vulnerability and
higher grade of the vadose zone.
3.2.4 Rating and Evaluation of Groundwater Pollution
Source Intensity
The evaluation of groundwater pollution source intensity needs to comprehensively
consider the characteristics of both pollution sources and vadose zones. Matrixes
are built to reflect, in a concise and intuitive way, the coupling effects of these
characteristics on groundwater pollution source intensity, with results as shown in
Table 3.13. Higher grade denotes higher groundwater pollution source intensity.
Higher grade implies greater impact of pollution sources on groundwater.
Therefore, Grade III contaminated sites are classified for priority pollution control
(hereinafter referred to as “priority sites”), Grade II contaminated sites for regular
pollution control (hereinafter referred to as “regular sites”), and Grade I contaminated sites for general pollution control (hereinafter referred to as “general sites”).
Table 3.13 Groundwater pollution source intensity rating
Grade of groundwater pollution source intensity
Grade of pollution
source hazard
I
II
III
Grade of mitigation performance of vadose zone
I
I
I
II
II
I
II
III
III
II
III
III
3.2 Method of Groundwater Pollution Source Intensity Rating …
61