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Delineation Of A Chlorinated-Solvents Plume In Complex Stratigraphy Using The Waterloo (Ingleton) Prof’IlerNormal access

Authors: Scott A. MacFabe, Dr. David Rudolph and Carol J. Scholl
Event name: 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Methods Emphasis: Developments In Direct Push Technologies
Publication date: 22 March 1998
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 924.71Kb )

During site-characterization activities at a former waste-disposal structure in Illinois, chlorinated solvents
including trichloroethene (PCE) and related degradation products were found in shallow soils and ground water.
The nature of the contaminants that were released, combined with the complicated alluvial stratigraphy presented
a relatively common but problematic setting with regard to characterization and remediation of the site. The
preliminary investigation involved conventional field methods including geophysical surveys, GeoProbe@
borings, and conventional drilling and monitoring using an auger rig and monitoring wells. This preliminary
assessmenpt rovided a coarse outline of the plume emanating from the source area, but more detailed delineation
of the comam.ination and site lithology was required to confidently define the plume comiguration.
A review of alternative technologies identified a newly developed direct-push profiling device designed by Bob
Ingleton at the University of Waterloo to facilitate detailed, depth-discrete ground water sampling. This device
has the following advantages: eliminates generation of contaminated drill spoil, greatly reduces volume of
dewntamination water required, provides qualitative determinations of hydraulic conductivity and lithology,
enables multiple sample wllection at various depths without need for retracting device between samples and no
permanent wells are left behind At the Illinois site, application of the Profiler provided an inexpensive and rapid
method of developing vertical profiles of ground water quality, resulting in a more comprehensive delineation
of wmammation as well as evidence supporting the intrinsic remedial capabilities of the subsurface. The results
of the investigation show that the Waterloo Profiler produces superior results in settings requiring detailed
analysis, minimal waste generation, and temporary sampling locations.

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