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[Case study on health risk assessment based on site-specific conceptual model]
Mao-Sheng Zhong1, Lin Jiang, Jue-Jun Yao
1Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China. zzmmss1986@126.com
Huan Jing Ke Xue= Huanjing Kexue
|May 15, 2013
Summary
Subsurface soil and groundwater near a former chemical plant show heavy 1,2-dichloroethane pollution. Site-specific models reveal carcinogenic risks significantly exceeding acceptable levels, unlike generic models.
Area of Science:
- Environmental Science
- Hydrogeology
- Risk Assessment
Background:
- Site investigation conducted downstream of a former chemical plant.
- Redevelopment plans for a subway station in the affected area.
- Previous industrial activities leading to potential subsurface contamination.
Purpose of the Study:
- Assess soil and groundwater contamination by 1,2-dichloroethane.
- Develop a site-specific contamination conceptual model for a subway station.
- Compare carcinogenic risks using generic versus site-specific models.
Main Methods:
- Subsurface soil and groundwater sampling and analysis.
- Development of a site-specific contamination conceptual model.
- Derivation of a site-specific risk calculation equation.
- Comparison of carcinogenic risk assessments.
Main Results:
- Heavy pollution of soil and groundwater by 1,2-dichloroethane detected.
- Highest concentrations: 104.08 mg/kg (soil) and 18500 µg/L (groundwater).
- Both generic and site-specific models indicate carcinogenic risks exceeding 1 x 10⁻⁶.
- Site-specific model yielded lower risk estimates than the generic model (2x for soil, 1.5x for groundwater).
Conclusions:
- Generic risk assessment models may underestimate risks when specific site conditions are ignored.
- Site-specific modeling is crucial for accurate risk evaluation in complex redevelopment projects.
- Contamination poses a significant carcinogenic risk, necessitating remediation strategies.
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