The objectives of this project(B) are: conducted the two-stage investigation of soil and groundwater contamination at the four 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.