PreDICT™:  Enhancing the EPRI Generic Work Plan to Assess Dense Non-Aqueous Phase Liquid Mobility in the Subsurface at Manufactured Gas Plant Sites

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Poster:

PreDICT™:  Enhancing the EPRI Generic Work Plan to Assess Dense Non-Aqueous Phase Liquid Mobility in the Subsurface at Manufactured Gas Plant Sites

Presenter:  Derek  Tomlinson (GEI Consultants, Inc.)
Authors:  Derek W. Tomlinson, J. Michael Hawthorne, Lisa Reyenga, Gaylen R. Brubaker (GEI Consultants, Inc.),  Jeffrey A. Clock (Electric Power Research Institute (EPRI)), David V. Nakles (Carnegie Mellon University)

Abstract:

Research has shown that when dense non-aqueous phase liquid (DNAPL) is present in the subsurface at a manufactured gas plant (MGP) site, a principal issue related to site closure is an assessment of its mobility and potential for migration.  In the absence of a quantitative approach for differentiating between mobile and immobile DNAPL, environmental regulators are prone to the conservative assumption that all DNAPL identified in the subsurface is potentially mobile; thereby, precluding environmental closure of the Site until the subsurface DNAPL is removed or otherwise managed.  Expanding on earlier Electric Power Research Institute (EPRI)-sponsored research, the DNAPL mobility assessment approach within the Generic Work Plan to Assess Dense Non-Aqueous Phase Liquid Mobility in the Subsurface at Manufactured Gas Plant Sites (EPRI, 2015) provides a standardized and reproducible characterization protocol using a combination of conventional and high resolution site characterization (HRSC) field-based and laboratory-based methods for conducting a site-specific subsurface DNAPL mobility assessment.  To further enhance the EPRI protocol, the Precision Recoverability Evaluation for DNAPL via Transmissivity (PreDICT™, patent pending) is a new in situ process for areas of known pooled MGP DNAPL to best understand the lithological units that are the primary focus of concern and define if these fingers of mobile MGP DNAPL are nearing a quantifiable endpoint based upon transmissivity.  The use of PreDICT™ aids in bettering understanding of areas of mobile DNAPL that may have the potential to migrate, and how to best address these zones within the subsurface; and further, as a leading, lagging, progress, and design remediation metric for DNAPL removal technologies like hydraulic recovery.  The EPRI protocol uses methods that are acceptable to the regulatory community and provide responsible parties with the data necessary for informed, defensible evaluations of the potential for subsurface DNAPL to migrate under anticipated site conditions.  In addition to supporting site closure, the EPRI protocol may also be used to target areas of mobile DNAPL at a site for active remediation, where PreDICT™ provides critical design information for hydraulic remedies, enhances CSMs with high resolution mobile NAPL interval data, and aids in defining the endpoint metrics for remediation through quantified levels of transmissivity, a metric gaining nation-wide regulatory approval.      EPRI, 2015.  Generic Work Plan to Assess Dense Non-Aqueous Phase Liquid Mobility in the Subsurface at Manufactured Gas Plant Sites. EPRI, Palo Alto, CA: 2015. 3002006708. http://www.epri.com/abstracts/Pages/ProductAbstract.aspx?ProductId=000000003002006708

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http://mgpsymposium.com/poster-presentations/

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