May 17, 2015

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Geosyntec Professionals Contribute to New ITRC Guidance on Integrated DNAPL Site Characterization and Tools Selection

Continuing Geosyntec’s long history of contributing to the latest scientific advancements in the cleanup of sites contaminated with dense nonaqueous phase liquids (DNAPLs) and DNAPL mixtures, several senior Geosyntec professionals played a key role in a recently published guidance manual from the Interstate Technology & Regulatory Council (ITRC).

The guidance, entitled “Integrated DNAPL Site Characterization and Tools Selection,” reviews the current knowledge of DNAPLs and their subsurface behavior.  Using an integrated site characterization (ISC) approach that emphasizes adequate data resolution to fully characterize a site, the manual describes how to align data on geology, groundwater flow, and contaminant distribution at a spatial resolution appropriate to the site-specific remedial objectives.  With improved understanding of subsurface contaminant behavior, both existing and new tools and techniques can be used to measure physical, chemical, and hydrologic subsurface parameters to better understand DNAPL-related concerns.  Following an ISC approach significantly reduces uncertainty and enables the development of cost-effective solutions to manage DNAPL contaminated sites.    

The Geosyntec staff that were involved were:

  • Mary DeFlaun, Ph.D., BCES (Princeton);
  • Bruce Marvin, P.E. (Oakland);
  • David Reynolds, Ph.D., P.Eng. (Kingston);
  • Derek Tomlinson, P.E., P.Eng. (Philadelphia);
  • Gary Wealthall, Ph.D. (Toronto); and
  • Ryan Wymore, P.E. (Northern Colorado)

The document synthesizes the knowledge of DNAPL site characterization and remediation and provides guidance on simultaneous characterization of contaminant distributions, hydrogeology, and attenuation processes to allow for improvements in the following areas:

  • assessment of ongoing contaminant exposures;
  • quantification of contaminant transport, storage, and attenuation patterns;
  • prediction of future exposures that would occur without intervention;
  • prediction of changes in future exposures that would occur in response to remedial actions; and
  • selection and design of remedial actions.

The Integrated DNAPL Site Characterization guidance manual is available online, with an internet-based course available beginning on July 23, 2015.

If you have any questions about ITRC or the guidance manual, please contact Mary DeFlaun at (609) 493-9005 or This email address is being protected from spambots. You need JavaScript enabled to view it.; Bruce Marvin at (510) 285-2753 or This email address is being protected from spambots. You need JavaScript enabled to view it.; David Reynolds at (519) 515-0883 or This email address is being protected from spambots. You need JavaScript enabled to view it.; Derek Tomlinson at (267) 419-3102 or This email address is being protected from spambots. You need JavaScript enabled to view it.; Gary Wealthall at (519) 515-0880 or This email address is being protected from spambots. You need JavaScript enabled to view it.; or, Ryan Wymore at (720) 258-8588 orThis email address is being protected from spambots. You need JavaScript enabled to view it..