Provides a systematic understanding of the technical and related regulatory considerations for ISB of chlorinated ethene DNAPL source zones, based on scientifically sound and credible evidence. CD includes BIODNAPL-2.

Presents six critically reviewed case studies of recent or ongoing applications ISB of DNAPLs as evidence that it is a viable cleanup strategy. A companion CD contains the document and presentations made at the Case Studies Forum.

Description of nitrate in the environment, sources of nitrate, environmental and health effects of nitrate, current nitrate remediation practices, and the emerging technology of EISBD.

Presents and discusses regulatory processes appropriate to a variety of active bioremediation techniques for chlorinated solvents in ground water.

Evaluation of state practices for establishing and implementing closure criteria for bioventing, vapor extraction, and natural attenuation of petroleum hydrocarbons and chlorinated solvents.

The In situ Bioremediation Team initiated a project to define a standardized method to compare cost and performance information from in situ bioremediation technologies.

A General Protocol and Outline for the general class of in situ bioremediation technologies plus conducted detailed literature reviews of technology-specific protocols for “Natural Attenuation” and “Bioventing” of petroleum hydrocarbons.

This report discusses case studies in six states where institutional and regulatory barriers to implementation of in situ bioremediation (ISB) were overcome.