Geochemical, Microbial, and Physical Characterization of 200-DV-1 Operable Unit B-Complex Cores from Boreholes C9552, C9487, and C9488 on the Hanford Site Central Plateau

Szecsody, James E.; Truex, Michael J.; Lee, Brady D.; Strickland, Christopher E.; Moran, James J.; Snyder, Michelle M.V.; Resch, Charles T.; Lawter, Amanda R.; Zhong, Lirong; Gartman, Brandy N.; Saunders, Danielle L.; Baum, Steven R.; Leavy, Ian I.; Horner, Jacob A.; Williams, Bruce A.; Christiansen, Beren B.; McElroy, Erin M.; Nims, Megan K.; Clayton, Ray E.; Appriou, Delphine

doi:10.2172/1488861

Cited by 12 publications

(36 citation statements)

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“…In contrast, DePaolo et al (2004) suggest that strong evaporative effects in upper Hanford soil columns can create significant (e.g., 2-6 ‰ shift in δ 18 O) isotopic enrichment in resulting vadose zone moisture. This mechanism likely helps explain the enriched isotope values observed in samples from C9552 and C9488 (Szecsody et al 2017). This effect is generally confined to only the upper couple meters (or less) of soil.…”

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 84%

“…A similar process may also contribute to the most extreme isotopic signature within the C9507 T19 borehole, notably B35432, as there was noted release of process and steam condensate from the 242 T evaporator in this region but also release of additional tank waste and waste supernate (DOE 2016). It is unclear whether a similar mechanism can explain the depleted isotope signatures in C9487 (specifically B34WB1 [Szecsody et al 2017]), but it remains a leading hypothesis regarding the extracted water in this sample having an isotopic composition more depleted than annual precipitation extremes or observed groundwater.…”

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 96%

“…These relationships show strong connection to both previous measurements of vadose zone water ; identified a slope of ~5) and to the regional meteoric precipitation line (slope of ~5.8). More revealing, however, is the offset between sample data sets whereby samples from C9552 (Szecsody et al 2017) are noticeably shifted to the right in the isotope plots, likely indicating more extensive evaporation history in these samples than in the others.…”

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 98%

“…There is overlap between the local meteoric water correlation for each of the extracted water samples and nearly all of the perched water samples, suggesting close connection between regional precipitation and the samples. There is also an interesting relationship between the data from boreholes containing three or more data points (C9507, C9552 [Szecsody et al 2017], and C9487 [Szecsody et al 2017]). In each of these cases, the data show strong correlation between the two isotopes (R 2 of 1.00, 0.97, and 0.91 respectively) as would be expected, and the linear fit to each of these data sets show a show respective slopes of 5.46, 5.74, and 5.62.…”

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 99%

“…First, most boreholes having multiple data points show covariance of the two measured isotopes, suggesting strong input from regional precipitation (e.g., C9507 T19, C9487 [Szecsody et al 2017], C9552 [Szecsody et al 2017], and the suite of perched water samples ). While each of these data sets shows isotopic signatures associated with evaporation, samples from C9552 (Szecsody et al 2017) show a significant increase in this feature, suggesting a stronger evaporative history than in the other samples. In contrast to evaporative enrichment, some samples show negative isotope excursions suggestive of inclusion of condensate-derived moisture in the vadose zone.…”

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 99%

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Contaminant Attenuation and Transport Characterization of 200-DV-1 Operable Unit Sediment Samples from Boreholes C9497, C9498, C9603, C9488, and C9513

Demirkanli

Truex

Szecsody

et al. 2018

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iii Summary Contaminants disposed of at the land surface must migrate through the vadose zone before entering groundwater. Processes that occur in the vadose zone can attenuate contaminant concentrations during transport through the vadose zone. Thus, quantifying contaminant attenuation and contaminant transport processes in the vadose zone, in support of the conceptual site model (CSM) and fate and transport assessments, is important for assessing the need for, and type of, remediation in the vadose zone and groundwater. The framework to characterize attenuation and transport processes provided in U.S. Environmental Protection Agency (EPA) guidance documents was used to guide the laboratory effort reported herein.

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Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 84%

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 96%

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 98%

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 99%

Section: Oxygen and Hydrogen Isotopesmentioning

confidence: 99%

See 3 more Smart Citations

Contaminant Attenuation and Transport Characterization of 200-DV-1 Operable Unit Sediment Samples from Boreholes C9497, C9498, C9603, C9488, and C9513

Demirkanli

Truex

Szecsody

et al. 2018

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Development of a vadose zone advanced monitoring system: Tools to assess groundwater vulnerability

Linneman

Strickland

Appriou

et al. 2022

Vadose Zone Journal

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Performing repeat pore‐fluid sampling over long time‐scales can provide valuable information on unsaturated zone contaminants and their potential flux to ground water. This information can be used to manage groundwater remedies and identify contaminants that need to be sequestered in the vadose zone to minimize flux to ground water. Pore‐water samples are commonly used to obtain contaminant concentrations within the vadose zone, but existing methods are limited as they only provide a single sample at one location and time. The vadose zone advanced monitoring system (VZAMS) has been designed to integrate multiple technologies into a single down‐borehole system that allows for sampling of pore fluids (liquid and gas) to provide information about contamination and hydraulic conditions at multiple depths (∼0.3‐m intervals) within a cased borehole. Testing has been completed at the laboratory scale to verify the sampling elements of VZAMS, including geochemical testing for representative contaminants known to exist at the Hanford Site, located in southeastern Washington State. Physical tests focused on the ability of the sampler to draw fluid under unsaturated conditions. Initial geochemical testing showed that the stainless steel material used with the porous cuff may affect the sampled concentrations of redox‐sensitive contaminants under very dry conditions. Additional laboratory testing demonstrated that the VZAMS components are able to collect representative samples for substances of interest under expected field conditions. In this paper, the design and functionality of a novel instrument are demonstrated in support of subsequent testing in the field.

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Experimental and Numerical Study of Radioiodine Sorption and Transport in Hanford Sediments

He,

Rockhold,

Fang

et al. 2024

ACS Earth Space Chem.

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Radioiodine ( 129 I) poses a potential risk to human health and the environment at several U.S. Department of Energy sites, including the Hanford Site, located in southeastern Washington State. Experimental studies and numerical modeling were performed to provide a technical basis for field-scale modeling of iodine sorption and transport behavior. The experiments were carried out using six columns of repacked contaminated sediments from the Hanford Site. Although iodate has been determined to be the dominant iodine species at the Hanford Site, the sorption and transport behaviors of different iodine species were investigated in a series of column experiments by first leaching sediments with artificial groundwater (AGW) followed by AGW containing iodate (IO 3 − ), iodide (I − ), or organo-iodine (2-iodo-5-methoxyphenol, C 7 H 7 IO 2 ). Ferrihydrite amendments were added to the sediments for three of the columns to evaluate the impact of ferrihydrite on 129 I attenuation. The results showed that ferrihydrite enhanced the iodate sorption capacity of the sediment and retarded the transport but had little effect on iodide or organo-I, providing a technical basis for developing a ferrihydrite-based remedial strategy for iodate under oxidizing conditions. Data from the column transport experiments were modeled using the linear equilibrium Freundlich isotherm model, the kinetic Langmuir adsorption model, and a distributed rate model. Comparisons of the experimental data and modeling results indicated that sorption was best represented with the distributed rate model with rates and maximum sorption extents varying by iodine species and ferrihydrite treatment. However, the linear Freundlich isotherm (K d ) model was also found to fit the laboratory experimental data relatively well, suggesting that the K d model could also be used to represent iodine transport at the field scale.

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Geochemical, Microbial, and Physical Characterization of 200-DV-1 Operable Unit B-Complex Cores from Boreholes C9552, C9487, and C9488 on the Hanford Site Central Plateau

Cited by 12 publications

References 0 publications

Contaminant Attenuation and Transport Characterization of 200-DV-1 Operable Unit Sediment Samples from Boreholes C9497, C9498, C9603, C9488, and C9513

Contaminant Attenuation and Transport Characterization of 200-DV-1 Operable Unit Sediment Samples from Boreholes C9497, C9498, C9603, C9488, and C9513

Development of a vadose zone advanced monitoring system: Tools to assess groundwater vulnerability

Experimental and Numerical Study of Radioiodine Sorption and Transport in Hanford Sediments

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