Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report Page: 4 of 69
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4. RESEARCH OBJECTIVES
Nuclear weapons and energy related research, much of it conducted during wartime and
other conditions of national stress, has left the DOE with a legacy of large quantities of
radiometric, chemical, and other wastes. In some cases, past disposal practices for
hazardous wastes have been inadequate to ensure the health and safety of DOE workers
and the public. Environmental Management activities within the DOE aim broadly to
assess and effectively deal with environmental problems resulting from past or current
One need within Environmental Management activities is to develop improved methods
for subsurface imaging, whether by seismic, electromagnetic, magnetic, radiometric,
resistivity, or other techniques. Possible applications of electromagnetic subsurface
imaging within the DOE complex include:
" waste pit and trench location,
" characterization of the contents of pits and trenches,
" assuring the thickness and conformance to construction standards of waste pit caps,
" periodic imaging of pit caps to assess longer term integrity,
" assessment of shallow grout injections,
" monitoring DNAPL and LNAPL spills and cleanup,
" characterizing the vadose zone by mapping geologic structures that have electrical
conductivity contrasts that may be related to differences in hydraulic conductivity.
Specific research objectives of this EMSP project, 60162, are given below.
" Enhance the state of the art of shallow (0 to -5 m) electromagnetic subsurface
imaging in conductive earth.
" Achieve better penetration than GPR in conductive earth.
" Achieve better resolution than conventional time-domain EM systems in the first 5
meters of depth.
" Develop forward and inverse numerical models appropriate to the VETEM system,
including at least a fast 1D inverse modeling code for in-the-field interpretation.
* Determine the effectiveness of the VETEM system by field applications at DOE sites.
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Wright, D. L. & Chew, W. C. Enhancements to and Characterization of the Very Early Time Electromagnetic (VETEM) Prototype Instrument and Applications to Shallow Subsurface Imaging at Sites in the DOE Complex - Final Report, report, December 1, 2000; Denver, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc722565/m1/4/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.