chapter  4
27 Pages

Performance Evaluations of Pump-and-Treat Remediations 1

WithJoseph F. Keely

Pump-and-treat remediations are complicated by a variety of factors. Variations in ground-water flow velocities and directions are imposed on natural systems by remediation wellfields, and these variations complicate attempts to evaluate the progress of pump-and-treat remediations. This is in part because of the tortuosity of the flowlines that are generated and the concurrent redistribution of contaminant pathways that occurs. An important consequence of altering contaminant pathways by remediation wellfields is that historical trends of contaminant concentrations at local monitoring wells may not be useful for future predictions about the contaminant plumes.

An adequate understanding of the true extent of a contamination problem at a site may not be obtained unless the site’s geologic, hydrologie, chemical, and biological complexities are appropriately defined. By extension, optimization of the effectiveness and efficiency of a pump-and-treat remediation may be enhanced by the utilization of sophisticated site characterization approaches to provide more complete, site-specific data for use in remediation design and management efforts.