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DNAPL and LNAPL Site Characterisation

02 October 2014 01:00 PM - 02 October 2014 05:00 PM
Events, Past training

Workshop overview

The ½ day site characterization workshop will discuss the changes in the DNAPL, LNAPL, and Contaminant Fate and Transport Site Conceptual Models including the controlling roles of geology and the interaction of NAPLs and dissolved phase contaminants with geology; effects of NAPL types and properties and interactions with the subsurface on contaminant fate and transport.  Workshop participants will also be introduced to the Integrated Site Characterization approach including the important of high resolution characterization; goals based characterization objectives; contaminant phases; and the developing ITRC characterization tools table.


Sites contaminated with NAPLs and NAPL mixtures present significant environmental challenges and have proved recalcitrant to remediation, especially where sites have been contaminated with DNAPLs. We will introduce the concepts of the up to date contaminated Site Conceptual Model. This includes a discussion of how we can no longer address NAPL and dissolved phase contamination differently, and that they need to be considered together when addressing any site where NAPL are, or may have been, present. Workshop topics will include:

NAPL Site Conceptual Model

We will trace the history of the DNAPL, LNAPL, and dissolved phase contamination site characterization since the 1970’s.  We will discuss how the experienced we have gained in characterizing and working to remediate these sites has driven us to update overall our conceptual models of DNAPL, LNAPL, and dissolved phase contamination conceptual models.  This also includes the controlling role of small geologic heterogeneities on the fate and transport of NAPL and associated dissolved phase contamination is discussed in detail.

Effect of NAPL Types and Properties on Contaminant Fate and Transport

The next discussion will expand on the previous topics and provide training in how the NAPLs and associated aqueous, sorbed, and vapor phase contamination partition throughout the subsurface. We will discuss the mechanisms that control the flow of DNAPL and LNAPL in the subsurface including solubility, capillary entry pressure, saturation and residual saturation, wettability and interfacial tension as well as other properties. We then discuss the differences between laboratory grade “pure” DNAPLs and what is commonly released at a site, including mixed NAPLs, and high and low solubility NAPLS

LNAPL Presence and Flow

This discussion will focus on the concept of mobile, potentially mobile and immobile LNAPLs, NAPL thickness in the formation and wells, and the role of understanding LANPL saturation when characterizing an LNAPL site.

DNAPL Presence and Flow

This includes discussions of the DNAPL life cycle models of “higher” solubility DNAPLs such as chlorinated solvents, and the “lower” solubility DNAPLs such as coal tars and creosotes.   

Integrated Site Characterization

Building on the above steps, we will then present a detailed module describing the goals based Integrated Site Characterization approach that will both clarify how to collect appropriate scale data, and what types of data are collected with an emphasis on geology where appropriate. The training will discuss how to manage, analyze, and integrate the large geological-hydrogeological and contaminant data bases that can be developed using the Integrated Site Characterization approach.

Characterization Tools

We will prevent the developing ITRC Site Characterization Tools table that will help guide site characterization efforts as a resource that will resent many characterization tools, what they are used for, how geology affects tool choices, and references to more information on the tools.

Who should attend?

Practitioners, regulators, and others working on groundwater sites should attend this training course to learn more about various methods and potential uses of mass flux and mass discharge.

Practitioners, regulators, site managers, engineers, remediation scientists and others involved in site investigation should attend this training course to learn more about up-to-date strategies for site Characterization of NAPL impacted sites.

Workshop schedule

1:00pm             Welcome and introductions

                         NAPL Site Conceptual Model    

                         Effect of NAPL Types and Properties on Contaminant Fate and Transport

                         LNAPL and DNAPL Presence and Flow

2.30-3:00pm     Afternoon tea

                         LNAPL and DNAPL Presence and Flow cont’d

                         Integrated Site Characterization

                         Characterization Tools

5:00pm             Close

Workshop presenters

Naji Akladiss, Maine Department of Environmental Protection

Michael Smith, Vermont Department of Environmental Conservation

Charles Newell, GSI Environmental Inc

Tamzen Macbeth, CDM Smith

Kurt Pennell, Tufts University

Registration and Fees

Registration fees for the half day workshops are $350. This includes workshop registration, all catering, workshop materials and handouts.

Eventbrite - Melbourne DNAPL and LNAPL Workshops