Many industrial areas were established in Taoyuan with varied manufacturing process. The widespread industrials in these areas generate different and complex pollutants which are not easy to deal with. Some industrial areas were contaminated by organic chlorinated solvents for long period; in particular the presence of chlorinated solvents in groundwater. However, the pollution existed for more than 20 years but the pollution sources have not been clearly identified in some highly concerned sites. For overcoming this problem and trying to clarify the pollution extent in these industrial areas in Taoyuan, the environment protection bureau (EPB) launched a project in 2013 executing by Industrial Technology Research Institute (ITRI), for investigating and identifying the pollution source of chlorinated solvents in groundwater which having priority and controversy. In addition, strategies for managing and handling with contaminated sites are also suggested by the results of this project. All items listed in the contract are completed in this project. The supervision and the inspection of factories controlled by the Law of soil and groundwater were carried out every 2 month. About 14 to 16 sites were evaluated every 2 month to monitor and inspect the status of contaminated sites in Taoyuan. The information collected by each time of inspection were periodically reported, updated and uploaded on-line to the soil and groundwater management system (SGM) maintained by the EPA. The results of factories inspection were concluded in chapter 6 in this final report. An important section of this project is to clarify the pollution extent and try to identify the pollution source. For this purpose, analysis results of groundwater in Chung-Li industrial area in previous investigation were collected and reviewed, 4 contaminated sites, referred as K、T、Y, and O were determined as the investigation target. Totally 12 monitoring wells were hence set-up in Chung-Li Industrial area, and 19 groundwater samples were taken out for the analysis of volatile organic compounds (VOCs). Besides, the compound-specific isotope analysis (CSIA) technique was employed in this project to illustrate the possible location or directions of the pollution sources. The investigation proposals for 4 contaminated sites were submitted in the first midterm report (August, 2013); the results of monitoring wells set up were summarized and exhibited in chapter 3. The results demonstrated that 3 pollution plumes existed among these 4 contaminated sites in Chung-Li industrial area. The pollution sources of T site and Y site were not inside the factory boundaries; T site and Y site were not responsible to the pollution generation. The pollution source of K site, O site and Nei-Ding elementary school were suggested to be the same one, came from the northwest direction of O site. In addition to site investigation, literature reviews of chlorinated solvent operation, and the case studies for investigating of contaminated site by chlorinated solvents were organized in chapter 4. Strategies and suggestions proposed for factories management in Taoyuan were revealed in chapter 5. Others assistance requested by EPB were listed in chapter 7. Chapter 8 concluded and made suggestions of this project.

Chlorinated solvent;Contaminated sites of soil and groundwater;Compound Specific Isotope