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Open-File Report 2005–1338
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Summary and Integration of Geophysical Investigations of the Tooele Army Depot (TEAD), Tooele, Utah

By Theodore H. Asch

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This report is a summary of the integration of the different geophysical investigations that have been performed to determine the depth to bedrock at the Tooele Army Depot (TEAD) near Tooele, Utah. The geophysical investigations discussed include the seismic, time-domain electromagnetic, gravity, and audio-magnetotelluric surveys. The primary purpose of these investigations was to investigate the depth to bedrock and the location of faults. This report provides an integration of the geophysical data with the available borehole information. The geophysical results, processing, and interpretation have been revisited from a data-integration point of view. Several inconsistencies became apparent between the different interpretations and with the borehole data. The various data sets were reexamined and the results were integrated into one interpretation. Site survey “coverage” (how much of the site was surveyed) was determined to be the main issue. The complicated and rapidly varying geology prevents full continuity of the geophysical interpretation of faulted blocks between the different lines and stations. A case is made for “wide-area” airborne electromagnetic and magnetic surveys of the Depot. These likely would result in a more comprehensive interpretation of the subsurface geology and, hence, the ground-water flow models in the vicinity of the Tooele Army Depot area.

Version 1.0

Posted September 2005

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