| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 104 === In this study, the site investigation protocol developed by American Society for Testing and Materials (ASTM) was applied to establish a conceptual model and determine the most concerned area of a chlorinated-solvent contaminated site located in northern Taiwan. A triad rapid site investigation system was also used for site characterization at this studied site. The risk assessment study was performed using the site investigation results to evaluate the appropriate site remediation methods for site cleanup.
Site investigation results show that the site soils were not polluted by tetrachloroethylene (PCE). However, up to 0.636 mg/L of PCE was observed in site groundwater (12.72 times higher than the groundwater remediation standard). Results from the human health risk assessment study indicate that the cancer risk resulted from the PCE contaminated groundwater was 7.627E-07, which was lower the cancer risk level (10-6. The calculated non-cancer risk was 1.591E-02, which was also lower than the non-cancer risk level (1). The cancer and non-cancer risks at the point located 360 m away from the most-contaminated area were 1.009E-17 and 2.105E-13, respectively, which were also much less than the risk levels.
To minimize the risk to human health, the following site management strategies need to be applied: (1) maintaining the vegetation to minimize the dust, (2) groundwater usage/pumping control to minimize the migration of plume, (3) regular health exam for local residents and air quality monitoring, (4) groundwater remediation to reduce the PCE contamination level to below 0.05 mg/L to protect the health of site workers and residents. Because the site risk is low, cost-effective technologies (e.g., bioremediation, permeable reactive barrier) can be applied for site remediation and plume control.
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