Provides a decision tree, case studies, and application information to determine whether biochemical reactor treatment is appropriate to treat mining-influenced water.

Provides the technical and related regulatory considerations for in situ bioremediation of chlorinated ethene dense nonaqueous phase liquids source zones.

Six critically reviewed case studies of recent or ongoing applications of in situ bioremediation at sites with dense nonaqueous phase liquid source zones.

Technological overview of in situ bioremediation and some of the issues to consider when selecting and designing an in situ bioremediation system for remediation of chlorinated ethene dense nonaqueous phase liquids source zones.

Provides guidance for the systematic characterization, evaluation, and appropriate design and testing of in situ bioremediation for any bio-treatable contaminant.

Provides a description of nitrate in the environment, sources of nitrate, environmental and health effects of nitrate, current nitrate remediation practices, and information on the emerging technology for enhanced in situ biodenitrification.

Describes practices to recognize and evaluate the presence of natural attenuation of chlorinated solvent contamination.

Summarizes survey results from participants of the Natural Attenuation of Chlorinated Solvents in Groundwater training course.

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

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