This project had four goals. The first was to review the appropriateness and water quality of regional and site-specific groundwater monitoring wells in Taiwan. The second was to research the reasons of high NH3--N concentration of monitoring wells. The third was to complete the investigations of the groundwater quality in public landfill. The fourth was to search and collect the data of monitoring wells in Taiwan. The service period was from February 5th, 2007, to January 31th , 2008. The major work implemented was as follows: 1.To analyze 383 regional monitoring wells. According to the results, there were 29 regional monitoring wells which didn’t exceed the Groundwater Control Standards. 298 regional monitoring wells can consider to reduce the monitoring frequency in the feature. 56 regional monitoring wells whose groundwater quality had exceeded the Groundwater Control Standards and the trend of monitoring results kept going up then must to be keep the monitoring frequency. In addition, we also update the data of 1,357 site-specific monitoring wells in Soil and Groundwater Pollution System of EPA in Taiwan. And recommended that there were 20 regional monitoring wells which could also take as site-specific monitoring wells and added the monitoring items listed in Groundwater Control Standards. 2.To investigate the reasons that the NO3--N concentration of the regional monitoring wells exceeded the Groundwater Monitoring Standard, Considering the results of those locations of monitoring wells, we found there was only one location of monitoring well could influence the monitoring results and the others should be regional background. 3.To investigate the groundwater guilty of public landfill, we updated the data of public landfills in Taiwan and collected the basic data of 18 landfills. In Phase I investigation, we sampled the groundwater of 35 monitoring wells which were originally set in landfills. In result, we found there were 2 groundwater samples of landfills whose benzene exceeded the Groundwater Control Standard. According to investigation results, these 2 landfills were selected to proceed the next step (Phase II). In Phase II investigation, we took 7 groundwater samples of 3 new standard monitoring wells and 4 originally ones. In the result of investigations, the benzene of those 7 groundwater samples still exceeded the Groundwater Control Standard. We recommended to ask the administration of landfill agencies to monitor and improve the groundwater quality. 4.Completed to search and collect monitoring data in websites of WRA, IDB and science parks in Taiwan.

Monitoring well management, Potential polluted area, Groundwater investigation