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• April 28, 2011

Many sites with chlorinated organic contamination in groundwater have gone through extensive remedial evaluations and actions. After years of operating high energy processes, their effectiveness has begun to diminish without remedial objectives being met. Other effective remedial alternatives can be applied; however, there are difficulties transitioning these sites from these high energy systems to other low energy remedial alternatives and eventually to Monitored Natural Attenuation (MNA).

This training on the ITRC Technical and Regulatory Guidance for Enhanced Attenuation: Chlorinated Organics (EACO-1, 2008) describes the transition (the bridge) between aggressive remedial actions and MNA and vise versa. Enhanced attenuation (EA) is the application of technologies that minimize energy input and are sustainable in order to reduce contaminant loading and/or increase the attenuation capacity of a contaminated plume to progress sites towards established remedial objectives. Contaminant loading and attenuation capacity are fundamental to sound decisions for remediation of groundwater contamination. This training explains how a decision framework which, when followed, allows for a smooth transition between more aggressive remedial technologies to sustainable remedial alternatives and eventually to Monitored Natural Attenuation. This training will demonstrate how this decision framework allows regulators and practitioners to integrate Enhanced Attenuation into the remedial decision process.

As our experience and knowledge grows around the implementation of MNA, the EA process will be considered an important management tool for optimizing site remedies and moving sites to final completion. This approach is consistent with the current regulatory environment and can be accommodated within a broad range of regulatory programs such as CERCLA and State dry cleaner regulations. This new framework and decision process will accelerate the environmental clean-up progress on a national scale and reduce overall costs, while still providing protection to human health and the environment.

For reference during the training class, participants should download and print a copy of the decision flow chart, Figure 2-1 on page 10 of the ITRC Technical and Regulatory Guidance for Enhanced Attenuation: Chlorinated Organics (EACO-1, 2008) and available as a 1-page PDF at http://www.cluin.org/conf/itrc/eaco/ITRC-EACO-DecisionFlowchart.pdf.

• John Doyon, New Jersey Department of Environmental Protection (jdoyon@dep.state.nj.us)
• Brian Looney, Savannah River National Laboratory(brian02.looney@srnl.doe.gov)
• Kimberly Wilson, South Carolina Department of Health and Environmental Control (wilsonka@dhec.sc.gov)
• Richard Lewis, HSA Engineers & Scientists / CRA (rlewis@craworld.com)
• Patrick McLoughlin, Microseeps Inc. (pmcloughlin@microseeps.com)
• Guy Sewell, East Central University (gsewell@ecok.edu)
• Eric Nuttall, University of New Mexico (nuttall@unm.edu)

• Mary Yelken, ITRC Training Program Support (myelken@theyelkengroup.com)
• Juliana Cheatham, ITRC Training Program Support (jcheatham@theyelkengroup.com)

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