The purposes of this project is to investigate the groundwater contamination potential of hazardous materials and its distribution. First of all, we collected the emerging contaminants by international concern, including persistent organic pollutants (POPs) and endocrine disrupting chemicals (EDCs). In order to understand the distribution of the contaminants in the environment. We reviewed the current groundwater standards against the collected contaminants, and screened out the contaminants which require further investigation. By knowing the distribution of the contaminants in the environment. We were able to rearrange Groundwater contaminants candidate list. The concerned emerging contaminants include Pentachlorobenzene, Dicyclohexyl Phthalate (DCHP), Diphenyl phthalate (DPHP), Di-n-hexyl phthalate (DNHP), Di-n-propyl phthalate (DPrP), Di (2-ethylhexyl) adipate (DEHA), Boron, lithium and Tungsten etc. Groundwater investigation of 50 groundwater monitoring wells was conducted based on the use of raw materials and historical environmental monitoring data .The results showed that DEHA (0.025~1.33 mg/L) and Boron (2×10-5~9.64×10-4 mg/L) were more significant than other substances. The concentration of Boron exceeded the foreign control limit of 0.3 mg/L, and may be caused by the operation of industrial activities. It is recommended that monitoring and investigation of groundwater be implemented continuously, and review whether the groundwater standards needs to be amended. This project also aims to investigate the possibility of concerned pesticides in the groundwater. Concerned pesticides include Chlordane, Terbufos, Phorate, Paraquat, Butachlor and so on, totally 26 species. The survey area was divided into rice area and vegetable area. A total of 10 simple wells were set up in this project. Phased sampling test was conducted according to the crop growth period, and the results were compared to the farmers pesticide usage record. The result of the investigation showed that Terbufos, Phorate and Butachlor were more significant than others, while the detection of concentrations were ppb level. This project referred to domestic and foreign research reports and databases to establish physical-chemical and toxicology data for the concerned contaminants. At present, data have been gathered for 163 contaminant candidates. Base on the contaminant candidate list and the results of the historical groundwater investigation. Boron and Di(2-ethylhexyl) phthalate(DEHP) were identified to be the priority controlled contaminants and strategies of controlling and survey planning were purposed by this project. This study recommend the government to continuously focus on the environment of the river basins. In addition, the results if this project provided fundamental information for amending the monitoring standard and regulating standards of groundwater in the future. Aforementioned results and suggestions could be submitted to competent authorities as practical implementation references.

Emerging Contaminants, Groundwater quality survey, Groundwater contaminants candidate list