This project was focusing on the soil and groundwater remediation in the An-Shuen Plant of the China Petrochemical Development Corporation (CPDC) located in Tainan City (the site), with primary goals on site investigation and recommendation actions. The resulting data showed that there was a soil sample in the employee dormitory showing its mercury concentration was higher than the “Soil Contamination Control Concentration”, as high as 24.9 mg/kg. As for dioxins, samples taken from the fishery earth walls and roads on the south side of the site showed dioxins concentration of 3,700 ng I-TEQ/kg (higher than the Control Concentration). The sediment samples taken at east side of the Lu-Er-Man Bridge of the Chu-Fa-Gun Stream had dioxins concentration higher than the Control Concentration, as high as 1,670 ng I-TEQ/kg. Within the control area including the chloralkali factory, pentachlorophenol（PCP）factory, mono-phase vegetation area, grass area, and seawater storage facility, the contaminant concentrations were higher than the Control Concentration. The chloralkali factory had the most significant mercury contamination, as high as 3,370 mg/kg; PCP factory had the most significant dioxins contamination, as high as 17,600,000 ng I-TEQ/kg.
This project also employed the Standard Guide for Risk-Corrective Action Applied at Petroleum Release Sites, RBCA, issued by the American Society for Testing and Materials, ASTM, for the risk assessment. The “Primary Risk Assessment” results showed that the dioxins carcinogenic risk in the old dormitory area was the highest. The “Seconday Risk Assessment” results showed that, within the contamination verification area, the quotient value of the dioxins carcinogenic risk value over mercury non-carcinogenic risk value was much lower than the commonly accepted carcinogenic risk value (1E-06) and non-carcinogenic risk quotient value (1), respectively.
As for the continued treatment, this project suggested 3 alternatives, such as remediation, environmental management, and on-site
