Provides a framework for understanding light, nonaqueous-phase liquid (LNAPL) site conditions and selecting the best-suited remedial technology.

An overview for evaluating natural source zone depletion rates and long-term progress at sites with light, nonaqueous-phase liquid contamination.

Provides guidance on how to properly deploy and collect samples in groundwater using five passive sampling technologies.

Provides technical and regulatory guidance on using direct push wells for long-term monitoring of groundwater chemistry and static groundwater levels.

Provides updated information on new developments and innovative approaches in applying permeable reactive barriers to treat a variety of groundwater contaminants.

Presents approaches to performance monitoring of various in situ technologies for the treatment of dense nonaqueous phase liquid source zones.

For regulators, technology users, and stakeholders to facilitate the use of polyethylene diffusion bag sampling, particularly for the long-term monitoring of volatile organic compounds in groundwater.

A jointly developed protocol for determining when, where, and how to use diffusion samplers for groundwater sampling.

Review of three general types of emerging dense nonaqueous phase liquid characterization technologies (including geophysical, cone penetrometer, and in situ tracers) and two categories of emerging remediation technologies (thermal enhanced extraction and in situ chemical oxidation).

U.S. Air Force document revised with state input to provide guidance on the design, construction, and monitoring of permeable reactive barriers in various hydrogeologic settings.