This project was to assist the EPA in investigating groundwater quality of high potential polluted area, developing management measures of monitoring wells and the water quality standards of artificial recharge. This project selected 70 monitoring wells in 27 industrial parks and 2 science parks with a distance within 1 km inside and outside to sample and test the groundwater quality. The results showed that trichloroethylene in Chung-li Industrial Estate, Vinyl chloride and cis-1, 2-Dichloroethylene in Shu-lin Industrial park exceeded the Groundwater pollution control standards. It was suggested to conduct follow-up inspections and continuous monitoring. The highest percentage of generally items exceeded the monitoring standards was Ammonia nitrogen. Other items such as heavy metals, persistent organic pollutants and total petroleum hydrocarbons didn’t exceed the control value. For the trace elements of heavy metals, no indium was found; the value of thallium was 0.000003mg/L（the same with detection limit） found in only one monitoring well; the value of gallium was between 0.00371~0.0452mg/L, and the value of molybdenum was between 0.000019~0.00139mg/L. For the management of monitoring wells, this project performed the trend analysis of groundwater quality of 431 regional monitoring wells in 10 national groundwater districts by Mann-Kendall Test. It was suggested to lower the monitoring frequency of 301 regional monitoring wells from four times to two times a year. Furthermore, we assisted the EPA in revising the Draft of Operations Specification of Abandonment of Groundwater Monitoring Wells, the Principles of Setting Site-Specific Monitoring Wells and Follow-Up Treatment, and integrating the operational guidelines and practical plans of monitoring data of various monitoring units. For establishing the water quality standard of artificial recharge source, we collected the information of present status of pumping and natural groundwater recharge, the drinking water source protection areas, the tap-water water source quality and volume protection areas in 10 national groundwater districts, and the actual status of groundwater pumping reported by the branches of Taiwan Water Corporation. We also referred to the methods of groundwater recharge and water standards in foreign countries. According to different recharge purposes, areas, water resources, and methods, we suggested selecting existing and applicable regulations and standards, and to provide relevant schemes in accordance with follow-up groundwater recharge activity.

Potential polluted area, Groundwater investigation, Monitoring well management