Assessment of Dense Non-Aqueous Phase Liquid (DNAPL) Mobility in Sediment



Assessment of Dense Non-Aqueous Phase Liquid (DNAPL) Mobility in Sediment

Presenter:  David V. Nakles (The CETER Group, Inc.)
Authors:  David V. Nakles (The CETER Group, Inc.),  Jeffrey Clock (EPRI),  Nicholas A. Azzolina (Energy and Environmental Research Center)


Dense non-aqueous phase liquid (DNAPL) in sediment provides a potential continuing source of hydrocarbon impacts to the environment.  These impacts may result from several transport mechanisms that have the potential to drive both regulatory actions and sediment remediation at MGP sites.  This presentation summarizes available literature on five potential key mobility pathways for DNAPL in sediment: (1) vertical and lateral movement; (2) bioturbation; (3) ebullition; (4) seiche; and (5) scour.  The literature survey comprised 121 different sources, including 23 separate EPRI reports.  A brief review of the science for each of the five mobility pathways will be presented along with potential field- or modeling-based tools for conducting site-specific sediment DNAPL mobility assessments.  This information can be used to assess the potential for a DNAPL-impacted sediment site to produce hydrocarbon sheens on the surface water and/or result in the migration of the DNAPL beyond acceptable limits of the site.  In addition, these DNAPL mobility pathways can assist in the development of remediation strategies for DNAPL in sediment.


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