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H2A Heads to Battelle’s Ninth International Conference on Remediation of Chlorinated and Recalcitrant

written by Andrea

Battelle LogoH2A’s Mike Hawthorne will present an update on his research (conducted jointly with Randy St. Germain of Dakota Technologies, Inc.) into detailed forensic analysis of laser induced fluorescence (LIF) data.  Modern risk-based light non-aqueous phase liquid (LNAPL) remedies at complex sites require high-resolution characterization data to develop comprehensive LNAPL conceptual site models (LCSMs) sufficient to support risk-based remedies.  Historically, LIF data has been used in aggregate form (percent of the reference emitter [RE]) to identify the occurrence and distribution of LNAPL at a site.  However, by performing a lifetime fitting analysis of the LIF data to break down each waveform into individual channel magnitudes and lifetimes, and utilizing a combination of univariate and multivariate statistical analyses and modeling of that waveform data, LIF borings can be classified into groups of similar/dissimilar LNAPLs.  In addition, gradients through the LIF borings, such as LNAPL weathering gradients, can be identified and modeled.  Finally, based on established LIF standards for given LNAPL types, individual LNAPLs can be fingerprinted to determine gross LNAPL type throughout a LIF investigated LNAPL plume.  Ultimately a three dimensional model of LNAPL group distributions can be developed for a site, allowing optimization of detailed well chemical LNAPL analyses and targeted application of specific LNAPL remedies.

H2A’s Shannon Walker, along with co-authors Dr. Rangaramanujam Muthu (H2A), Terry Vandell (Phillips 66), and Mike Hawthorne, authored a poster presentation titled “Improved LNAPL Conceptual Site Modeling and Remediation Management Using Automated Excel® Tools,” also to be presented at the conference.  The poster discusses a southwestern refinery, where stratigraphic traps created by a confining layer prevent LNAPL migration in the downgradient direction.  However, continued effectiveness of the traps is a concern during periods of decreased groundwater elevation.  The facility desired a simple system designed to be implemented by field personnel that facilitates rapid evaluation of LNAPL migration potential based on a relatively small subset of gauging data.  The spreadsheet tool thereby guides operational adjustments to the existing active hydraulic recovery and migration control system.

The conference, presented and organized by Battelle, is being held May 19 through 22, 2014, in Monterey, California.  Sponsors include other leading organizations active in site remediation research and application and attendees include scientists, engineers, regulators, and other environmental professionals representing universities, government site management and regulatory agencies, and R&D and manufacturing firms from more than 30 countries.

Note:  Battelle logo was obtained from their webpage (

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