This volume provides a review of the past 10 to 15 years of intensive research, development and demonstrations on the in situ remediation of dissolved chlorinated solvents. The intended audience includes the decision makers and practicing engineers and hydrogeologists who will select, design and operate these remedial systems, as well as researchers seeking to improve the current state-of-the-art. Our hope is that this volume will serve as a useful resource to assist remediation professionals in applying and developing the technology as effectively as possible.