This project focused on analysis of in-situ concentrations of chlorinated hydrocarbons in an aquitard underlying the site of a prior field- scale investigation of pump-and-treat remediation in sheet-pile "test cells" at Dover AFB, DE. Another aspect was the conduct of exploratory long-term column investigations of zero-valent metal barrier technologies, as applied to contaminated groundwater taken from the aquifer surrounding the cells. During the post-pumping ...