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Laser-Induced Fluorescence Screening Tools 101:
High Resolution Site Characterization Technology
May 4, 2017 at 12pm Eastern Time
Presented by Randy St. Germain
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 Presenter Biography:

Randy St. Germain, President of Dakota Technologies, Inc., developed much of Dakota's underlying time-resolved laser-induced fluorescence (LIF) technology while pursuing a M.S. Analytical Chemistry degree at North Dakota State University from 1987 to 1991.

Randy and his colleagues have developed a continually improving series of direct push deployable site characterization systems for high-definition delineation of petroleum, coal tar, and creosote NAPLs in the subsurface. From early research field trials of LIF at Air Force bases in 1992, through subsequent commercialization of the ROST, UVOST, TarGOST, and the new DyeLIF system for chlorinated DNAPLs, Randy has spent the last 25 years characterizing NAPL bodies with LIF.

Presentation Summary:
    Chlorinated solvents, petroleum, creosote, and coal tars are common contaminants at thousands of sites all over the world. These “source term” light non-aqueous phase liquid (LNAPL) and dense non-aqueous phase liquid (DNAPL) contaminants are potent sources of dissolved phase contamination, making proper characterization of their subsurface architecture a keystone of long term remediation success.  Unfortunately, these NAPL bodies typically distribute themselves in a highly heterogeneous fashion, leaving investigators with little alternative to gathering large data sets to understand their architecture, making traditional sampling and analysis costs prohibitively high.
    Laser-induced fluorescence (LIF) is a cost-effective alternative to traditional sampling because it logs the NAPL continuously in the subsurface in real time. 250 to 450 feet/day production rates are typical, making characterization of NAPL bodies possible in just a few days’ to a weeks’ time. While LIF offers numerous benefits, it’s important that investigators understand LIF technology, what the LIF technology can and can’t tell them about their site, and how to avoid applying LIF to sites and conditions that can’t benefit from LIF.
    The presenter, who is the lead developer of all LIF systems currently commercially available, will provide a brief summary of how LIF works, which LIF system to apply to which contaminant, what information LIF is capable of providing, along with its limitations.
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 Dakota Technologies, Inc. (Dakota) provides state-of-the-art services for hazardous waste site investigations, specializing in the rapid site assessment of subsurface LNAPL and multi-component DNAPL. Incorporated in 1993, Dakota has an experienced staff with over 90 years of combined experience in developing and deploying direct push screening tools for site investigations.

 Dakota Technologies, Inc.

2201-A 12th Street North, Fargo, ND 58102

701.237.4908 |