Using Multiple Geophysical Methods to Refine a Stratigraphic Conceptual Site Model at a Nuclear Waste Site

Robinson, J.; Clair, James St.; Thomle, Jonathan N.; Jaysaval, Piyoosh; Cambeiro, Joaquin; Peta, Kelsey; Day‐Lewis, Frederick D.; Mackley, Rob D.

doi:10.1007/s40710-023-00622-1

Environ. Process.

2023

DOI: 10.1007/s40710-023-00622-1

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Using Multiple Geophysical Methods to Refine a Stratigraphic Conceptual Site Model at a Nuclear Waste Site

J. Robinson

James St. Clair

Jonathan N. Thomle

et al.

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2024

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Cited by 2 publications

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“…ERT monitoring has also been used to image contaminant migration and solute transport (Casado et al, 2015;Kemna et al, 2002;Kuras et al, 2016), infer the distribution of vadose zone contaminants (Benecke et al, 2006;T. C. Johnson & Wellman, 2013;Rucker & Fink, 2007), and identify the preferential flow paths of surface water intruding into groundwater (T. C. Johnson et al, 2012Robinson et al, 2023;Wallin et al, 2013). Recent reviews (Dimech et al, 2022;Slater & Binley, 2021) recognized long-term resistivity monitoring as a useful tool to identify and follow inorganic contaminants, and Dimech et al (2022) noted that the vast majority of time-lapse ERT studies were focused on the detection of environmental plumes.…”

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confidence: 99%

Interpretation of large‐scale, long‐term electrical geophysical monitoring guided by a process simulation

Robinson,

Johnson,

Thomle

et al. 2024

Vadose Zone Journal

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Surface electrical resistivity tomography (ERT) was used at a waste site to monitor vadose zone changes in electrical properties as a proxy for contaminant flux over a span of 17 years. The BC Cribs and Trenches (BCCT) site at the Hanford site contains 20 disposal trenches and six disposal cribs. Wastes include a large inventory of technetium‐99 and large masses of nitrate and uranium‐238. ERT data were collected along 41 profiles in 2005 to characterize regions of elevated bulk electrical conductivity (BEC) associated with past liquid waste discharges. Previous analyses performed on samples from four boreholes showed a high correlation between nitrate concentration and BEC. In 2022, ERT data were re‐collected along the same profiles and six additional profiles in an area not previously surveyed. Compared to background uncontaminated areas, BEC was higher in contaminated areas at the waste sites. Given the correlation between nitrate concentration and BEC previously found at this site, ERT images show the spatial distribution and relative ionic concentration of vadose zone contaminants at BCCT. Between 2005 and 2022, ERT difference images showed a decrease in BEC surrounding most waste sites, with exceptions where there were known anthropogenic surface changes. An evaluation of recharge‐driven nitrate migration using synthetic flow and transport simulations showed that downward migration causes a decrease in BEC from the decrease in ionic strength at the trailing end of the plume where contaminants migrated downward. From this, we interpret ERT difference images as showing the predominant regions of downward ion flux.

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confidence: 99%

Interpretation of large‐scale, long‐term electrical geophysical monitoring guided by a process simulation

Robinson,

Johnson,

Thomle

et al. 2024

Vadose Zone Journal

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Flow Pathways in Fractured Basalt under Challenging Environmental Conditions: A Synergistic Approach of Electrical Resistivity Tomography and Seismic Refraction Imaging

Gemail,

Ghoneimi,

Shebl

et al. 2024

Environ. Process.

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Using Multiple Geophysical Methods to Refine a Stratigraphic Conceptual Site Model at a Nuclear Waste Site

Cited by 2 publications

References 51 publications

Interpretation of large‐scale, long‐term electrical geophysical monitoring guided by a process simulation

Interpretation of large‐scale, long‐term electrical geophysical monitoring guided by a process simulation

Flow Pathways in Fractured Basalt under Challenging Environmental Conditions: A Synergistic Approach of Electrical Resistivity Tomography and Seismic Refraction Imaging

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