II. Toxicity parameter value
The carcinogenic toxicity factors and non-carcinogenic toxicity factors (reference
dose) of the pollutants of concern at the site were queried from the relevant database. The results are shown in Table 5.100.
③ Exposure assessment
I. Land use type
Considering the way the groundwater is used by humans at the site and the surrounding area, it is assumed that the land use type associated with the use of
groundwater is sensitive land.
II. Source-pathway-receptor analysis
A. Pollution source
Based on the assessment of human health risks of contaminated groundwater, the
pollution source is: contaminated groundwater in the informal landfill.
B. Pollutant migration pathway
The wastewater pollution sources of the informal landfill mainly include leachate,
flushing water and domestic sewage. Pollutants penetrate into the groundwater
through the soil and pollute the groundwater at the site. Then, the polluted
groundwater further migrates, transforms and spreads through the flow of
groundwater.
Table 5.99 Determination of
carcinogenicity of pollutants
of concern at the site
Focus pollutants
Carcinogenicity
Nitrites
No
Nitrate
No
Ammonia-nitrogen
No
F
N o
Cl
No
Cyanide
No
Volatile phenols
No
Hg
No
As
Yes
Mn
No
Cd
No
Zn
No
Hexavalent chromium
Yes
Pb
No
282
5 Application Cases
The carcinogenic toxicity factors and non-carcinogenic toxicity factors (reference
dose) of the pollutants of concern at the site were queried from the relevant database. The results are shown in Table 5.100.
③ Exposure assessment
I. Land use type
Considering the way the groundwater is used by humans at the site and the surrounding area, it is assumed that the land use type associated with the use of
groundwater is sensitive land.
II. Source-pathway-receptor analysis
A. Pollution source
Based on the assessment of human health risks of contaminated groundwater, the
pollution source is: contaminated groundwater in the informal landfill.
B. Pollutant migration pathway
The wastewater pollution sources of the informal landfill mainly include leachate,
flushing water and domestic sewage. Pollutants penetrate into the groundwater
through the soil and pollute the groundwater at the site. Then, the polluted
groundwater further migrates, transforms and spreads through the flow of
groundwater.
Table 5.99 Determination of
carcinogenicity of pollutants
of concern at the site
Focus pollutants
Carcinogenicity
Nitrites
No
Nitrate
No
Ammonia-nitrogen
No
F
N o
Cl
No
Cyanide
No
Volatile phenols
No
Hg
No
As
Yes
Mn
No
Cd
No
Zn
No
Hexavalent chromium
Yes
Pb
No
282
5 Application Cases