This report provides an overview of the fundamentals and field applications of in situ bioremediation to remediate chlorinated solvents in contaminated soil and groundwater. In situ treatment is increasingly being selected to remediate sites because it is usually less expensive, and does not require waste extraction or excavation. In addition, in situ bioremediation is more publicly acceptable than above-ground technologies because it relies on natural processes to treat contaminants. This document presents information at a level of detail intended to familiarize federal and state project managers, permit workers, technology users, and contractors with in situ bioremediation. The report describes how chlorinated solvents are degraded, how to enhance the process by the addition of various materials and chemicals, design configurations, and the typical steps taken to evaluate technology feasibility at a specific site. It also includes a list of technology vendors and nine case studies of field applications.

Includes bibliographical references.