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August 12, 2022
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Integrated DNAPL Site Strategy
Internet-based seminar
Hosted by Interstate Technology and Regulatory Council (ITRC)

Sites contaminated by chlorinated solvents present a daunting environmental challenge, especially at sites with dense nonaqueous phase liquid (DNAPL) still present. Restoring sites contaminated by chlorinated solvents to typical regulatory criteria (low parts-per-billion concentrations) within a generation (~20 years) has proven exceptionally difficult, although there have been successes. Site managers must recognize that complete restoration of many of these sites will require prolonged treatment and involve several remediation technologies. To make as much progress as possible requires a thorough understanding of the site, clear descriptions of achievable objectives, and use of more than one remedial technology. Making efficient progress will require an adaptive management approach, and may also require transitioning from one remedy to another as the optimum range of a technique is surpassed. Targeted monitoring should be used and re-evaluation should be done periodically.

This ITRC Integrated Dense Nonaqueous Phase Liquid Site Strategy (IDSS-1, 2011) technical and regulatory guidance document will assist site managers in development of an integrated site remedial strategy. This course highlights five important features of an IDSS including:

1. A conceptual site model (CSM) that is based on reliable characterization and an understanding of the subsurface conditions that control contaminant transport, reactivity, and distribution
2. Remedial objectives and performance metrics that are clear, concise, and measureable
3. Treatment technologies applied to optimize performance and take advantage of potential synergistic effects
4. Monitoring based on interim and final cleanup objectives, the selected treatment technology and approach, and remedial performance goals
5. Reevaluating the strategy repeatedly and even modifying the approach when objectives are not being met or when alternative methods offer similar or better outcomes at lower cost


This IDSS guidance and training is intended for regulators, remedial project managers, and remediation engineers responsible for sites contaminated by chlorinated solvents. Because the subject matter is complex, this guidance assumes a functional understanding of the field and is targeted towards experienced users; however, novices will benefit through descriptions and references of the latest evolution of site characterization challenges; realistic planning of site restoration; evolving treatment techniques; and evaluating, monitoring and interpreting mass transport in the subsurface aqueous and vapor phases. While the primary focus of the document is on DNAPL sites, other types of contaminated sites (e.g. petroleum, mixed contaminants, etc.) can use the same fundamental process described in this guidance.

For reference during the training class, participants should have a copy of the flow diagram, Figure 1-2 on page 6 of the ITRC Technical and Regulatory Guidance document, ITRC Integrated Dense Nonaqueous Phase Liquid Site Strategy (IDSS-1, 2011) and available as a 1-page PDF at http://www.cluin.org/conf/itrc/IDSS/ITRC-IDSS-1-Figure1-2.pdf.

For general information contact ITRC Training Program by telephone at 402-201-2419
 Upcoming Events

 No upcoming events.

Archives of past CLU-IN internet seminars are available in the CLU-IN Studio at http://clu-in.org/studio/. You will be able to view the slide and hear an audio stream of the presentation as it occurred.

Previous Events (click to view/hide)
Bullet  Live Online Class, Internet Based
  December 02, 2014 - December 02, 2014
Bullet  Live Online Class, Internet Based
  June 12, 2014 - June 12, 2014
Bullet  Live Online Class, Internet Based
  October 08, 2013 - October 08, 2013
Bullet  Live Online Class, Internet Based
  July 18, 2013 - July 18, 2013
Bullet  Live Online Class, Internet Based
  April 25, 2013 - April 25, 2013
Bullet  Live Online Class, Internet Based
  January 08, 2013 - January 08, 2013
Bullet  Live Online Class, Internet Based
  October 04, 2012 - October 04, 2012
Bullet  Live Online Class, Internet Based
  July 24, 2012 - July 24, 2012
Bullet  Live Online Class, Internet Based
  April 05, 2012 - April 05, 2012
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