Contamination Source Investigation and Mitigation Plan for Industrial Park of High Contamination Pot
In order to assess soil and groundwater qualities in the industrial parks, the Environmental Protection Administration (EPA) issued the project “Contamination Source Investigation and Mitigation Plan for Industrial Park of High Contamination Potential (PhaseⅢ)”. Based on the Light Classification Management designated by the EPA, the Linyuan industrial park and the Dayuan industrial park were selected in this project.
In this project, the investigation included two stages. At the first stage, geophysical surveys and geological drilling were conducted within the areas of the above-mentioned industrial parks. At the second stage, questionnaire surveys and interviews with workers were conducted to select the factories with higher pollution potential. A total of 10 sites were selected for further investigation in which geophysical surveys, soil sampling, well installation, and groundwater sampling were subsequently conducted. Based on these results of the two stages, the plumes of contamination and hot spots were identified. Human health risk assessments was conducted in order to ensure the safety of residential water usage. Furthermore, the administrative control measures was also proposed.
According to the investigating results of 10 factories, pollutants of soil and groundwater in 4 factories were found to be over the pollution control standards, and pollutants of soil in 2 factories were found to be over the standards. The soil pollutants included Cr, Cu, Zn, Ni, benzene and TPH; the groundwater pollutants included Cr, Ni, benzene, NO3--N and NO2-N. It has been suggested that all the factories listed above be supervised by the Environmental Protection Bureau, according to the Soil and Groundwater Pollution Regulations.
Regarding to the human health risk, the values were lower than the target values within the 2 industrial parks. It was recommended that the Environment Protection Bureau should cut off direct contact by pavement for contaminated soil, and continuous monitoring of the industrial zone of groundwater contaminant concentrations within this area people exposing to the contaminated groundwater.
hydrogeological investigation, geophysical, health risk assessments, pollution investigation, administrative control measures