The following tasks have been completed in accordance to the objectives of the project: conducted the three-stage investigation of soil and groundwater contamination at the ten chlorinated solvent operating factories selected; assisted EPA in performing the investigation and verification of contaminations of other potential sites; updated and modified the guidelines of DNAPL investigation issued by EPA. The final report of this project encompasses the feedbacks of site screening and investigation procedure, in hoping that these will assist EPA to set up an economical and effective method in processing future chlorinated solvent operating cases. The enforcement rate of contamination investigation is as high as 83 percent in this project. Of the twelve investigated sites, there were ten sites with groundwater pollutant concentration exceeding the pollution control standards. Eight listed chlorinated pollutants (vinyl chloride, 1,2-dichloroethane, methylene chloride, trichloroethylene, tetrachloroethylene, chlorobenzene, 1,1-dichloroethylene and chloromethane ), with the exception of chloromethane were found to exceed the pollution control standards in the conducted cases. The outcome of our efforts on project execution reveals that we attained an economical and effective methodology in the investigation of chlorinated contaminants. The determination of target contaminants, site screening based on inter-query database, evaluation of candidate sites, preliminary assessment of sites, priority list of investigation, investigation techniques and planning were all successfully managed in this project.

Soil and Groundwater；Chlorinated Solvent；Operating factory