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Accession Number DE13-1105039
Title Improved Three-Dimensional Resistivity Data Acquisition Capabilities at the Hanford Site-14146.
Publication Date Nov 2013
Media Count 10p
Personal Author D. R. Glaser M. Levitt M. McNeill N. Crook R. D. Hildebrand S. J. Eberlein
Abstract Soil contamination is known to exist within the vadose zone around Hanford's tank farms due to historic planned and unplanned releases to the environment. Soil borings alone do not provide a complete picture with regards to contamination extent within the subsurface. Electrical resistivity is a remote imaging tool used at the Hanford Site for mapping of subsurface electrical anomalies that may correspond to contaminants with high moisture content or high ionic strength. The resulting data is used to help design interim surface barriers or other interim remediation or mitigation measures. Additionally, the data is used to support subsurface characterization initiatives associated with environmental assessments and site closure. Historically, off-the-shelf commercially-available data acquisition systems have been used to collect resistivity data. These systems generally contained a maximum of eight channels for data acquisition at a given time due to technological restrictions. This severely limits the area of investigation for 3D resistivity surveys. To compensate for this at the Hanford Site, data sets are acquired over smaller areas and then stitched together in model space, resulting in pseudo-3D resistivity models. This process provides less accurate information than what could be achieved with a higher number of data acquisition channels used over the full area of investigation. Additionally, field project durations, necessary support personnel, and subsequent costs are directly related to the speed of data acquisition that can be achieved. Thus, a system with a greater number of available channels should result in efficiencies in project schedule and project costs, with improved data quality. The recent 3D electrical resistivity characterization at 241-U Tank Farm represents the first full-farm true 3D environmental resistivity deployment in the world. Technological and manufacturing developments by the vendor resulted in a data acquisition system that far surpasses the ability of the previous off-the-shelf systems. The new data acquisition system allows for 180 channels, which enables the full-farm 3D acquisition without the inaccuracies associated with combining multiple datasets. This ultimately leads to a more accurate model of the subsurface and a better understanding of moisture and contaminant distribution within the vadose zone.
Keywords Closure
Data acquisition
Electric conductivity Soil contamin
Hanford Reservation
Moisture content
Radioactive wastes
Remedial action
Resistivity surveys
Soil contaminantion
Subsurface sturctures

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 68F - Radiation Pollution & Control
77G - Radioactive Wastes & Radioactivity
Corporate Author Washington River Protection Solutions, Richland, WA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1412
Contract Number DE-AC27-08RV14800

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