scholarly journals Evaluating Contaminant Flux from the Vadose Zone to the Groundwater in the Hanford Central Plateau. SX Tank Farms Case Study

2015 ◽  
Author(s):  
Michael J. Truex ◽  
Martinus Oostrom ◽  
George V. Last ◽  
Christopher E. Strickland ◽  
Guzel D. Tartakovsky
Keyword(s):  
Vadose Zone ◽  
Central Plateau ◽  
Contaminant Flux

scholarly journals Evaluation of deep vadose zone contaminant flux into groundwater: Approach and case study

2016 ◽  
Vol 189 ◽  
pp. 27-43 ◽  
Author(s):  
M. Oostrom ◽  
M.J. Truex ◽  
G.V. Last ◽  
C.E. Strickland ◽  
G.D. Tartakovsky
Keyword(s):  
Vadose Zone ◽  
Contaminant Flux

Integrated Strategy to Address Hanford’s Deep Vadose Zone Remediation Challenges

2010 ◽  
Author(s):  
Mark B. Triplett ◽  
Mark D. Freshley ◽  
Michael J. Truex ◽  
Dawn M. Wellman ◽  
Kurt D. Gerdes ◽  
...  
Keyword(s):  
Vadose Zone ◽  
Department Of Energy ◽  
Central Plateau ◽  
Uranium Contamination ◽  
Integrated Strategy ◽  
Effective Depth ◽  
Contaminant Flux ◽  
Defense In Depth ◽  
And Control ◽  
Reactive Gas

A vast majority of Hanford’s remaining in-ground contaminants reside in the vadose zone of the Central Plateau, where reprocessing operations occurred. The vadose zone is comprised of about 75 meters of water-unsaturated sediments above groundwater. If left untreated, these contaminants could reach groundwater and could remain a threat for centuries. Much of this contamination resides deep in the vadose zone, below the effective depth of tradition surface remedy influence. In 2008, the Department of Energy initiated deep vadose zone treatability testing to seek remedies for technetium-99 and uranium contamination. These tests include the application of desiccation for technetium-99 and reactive gas technologies for uranium. To complement these efforts, the Department of Energy has initiated a “defense-in-depth” approach to address the unique challenges for characterization and remediation of the deep vadose zone. This defense-in-depth approach will implement multiple approaches to understand and control contaminant flux from the deep vadose zone to the groundwater. Among these approaches is an increased investment in science and technology solutions to resolve deep vadose zone challenges including characterization, prediction, remediation, and monitoring.

scholarly journals Modeling non-steady state radioisotope transport in the vadose zone – A case study using uranium isotopes at Peña Blanca, Mexico

2009 ◽  
Vol 73 (20) ◽  
pp. 6052-6064 ◽  
Author(s):  
T.L. Ku ◽  
S. Luo ◽  
S.J. Goldstein ◽  
M.T. Murrell ◽  
W.L. Chu ◽  
...  
Keyword(s):  
Steady State ◽  
Vadose Zone ◽  
Uranium Isotopes

Stalactite drip-water monitoring and tracer tests approach to assess hydrogeologic behavior of karst vadose zone: case study of Han-sur-Lesse (Belgium)

2015 ◽  
Vol 74 (12) ◽  
pp. 7685-7697 ◽  
Author(s):  
Amaël Poulain ◽  
Gaëtan Rochez ◽  
Isabelle Bonniver ◽  
Vincent Hallet
Keyword(s):  
Vadose Zone ◽  
Tracer Tests ◽  
Water Monitoring ◽  
Drip Water

Integrated Systems-Based Approach to Monitoring Environmental Remediation

2013 ◽  
Author(s):  
Michael J. Truex ◽  
Amoret L. Bunn ◽  
Mart Oostrom ◽  
K. C. Carroll ◽  
Dawn M. Wellman
Keyword(s):  
Surface Water ◽  
Vadose Zone ◽  
Environmental Remediation ◽  
Unsaturated Flow ◽  
Transport Processes ◽  
Department Of Energy ◽  
Integrated Systems ◽  
Monitoring Design ◽  
Contaminant Flux

The U.S. Department of Energy is responsible for risk reduction and cleanup of its nuclear weapons complex. Remediation strategies for some of the contamination may include techniques that mitigate risk, but leave contaminants in place. Monitoring to verify remedy performance and long-term mitigation of risk is key to implementing these strategies and can be a large portion of the total cost of remedy implementation. Especially in these situations, there is a need for innovative monitoring approaches that move away from the cost- and labor-intensive point-source monitoring. In this paper, alternative approaches for monitoring are presented for vadose zone, groundwater, groundwater/surface water interface, and surface water. To illustrate integrated, systems-based monitoring, this paper focuses on vadose zone contaminant remediation to mitigate impact to groundwater. In this context, vadose zone contamination is a source, or potential source, to groundwater plumes. The monitoring design uses a systems-based approach focused on developing a conceptual site model that highlights key features that control contaminant flux to groundwater. These features are derived considering the unsaturated flow and contaminant transport processes in the vadose zone and the nature of the waste discharge. Diagnostic properties and/or parameters related to both short- and long-term contaminant flux to groundwater can be identified and targeted for monitoring. The resolution of monitoring data needed to correspond to a functionally useful indicator of flux to groundwater can be estimated using quantitative analyses and the associated unsaturated flow properties relevant to the targeted site and vadose zone features. This monitoring design approach follows the process of developing a quantitative conceptual model suitable for supporting projections of future flux to groundwater. Support for such projections is important because it is likely that, in many cases, remediation decisions for the vadose zone will need to be made based all or in part on projected impacts to groundwater, and monitoring will then be applied to verify that remedy goals are being met.

Wastewater treatment by infiltration percolation: a case study

2000 ◽  
Vol 41 (1) ◽  
pp. 77-84 ◽  
Author(s):  
V. Mottier ◽  
F. Brissaud ◽  
P. Nieto ◽  
Z. Alamy
Keyword(s):  
Vadose Zone ◽  
High Water ◽  
Faecal Coliforms ◽  
Dune Sands ◽  
Seaside Resort ◽  
Load Monitoring ◽  
Oxidation Performance ◽  
Kinetics Of ◽  
Stock Recovery

A 1700 p.e. pilot infiltration percolation plant treating the sewage of Mazagon, a seaside resort in the South of Spain, is investigated. Primary effluents, intermittently applied over twin 200 m2 infiltration basins, percolate down to the aquifer through unsaturated dune sands. Each application sequence delivers a volume of 0.25 m3 per m2 of infiltration basin. Analyses of the water sampled at five depths ranging from 0.3 to 2.0 m below the infiltration surface show that the oxidation performance of the plant is highly dependent on the applied load. Monitoring the oxygen content in the air phase of the vadose zone allows to determine the kinetics of the oxygen stock recovery and the oxidation capacity of the plant. Disappointing removal of faecal coliforms and streptococci is attributed to high pore water velocities due to infiltration heterogeneity and the high water height applied during each feeding sequence.

Long-term TNT and DNT contamination: 1-D modeling of natural attenuation in the vadose zone: case study, Portugal

2015 ◽  
Vol 75 (1) ◽  
Author(s):  
Helena I. F. Amaral ◽  
Ana Claúdia Gama ◽  
Cláudia Gonçalves ◽  
Judite Fernandes ◽  
Maria João Batista ◽  
...  
Keyword(s):  
Vadose Zone ◽  
Natural Attenuation

Deep Vadose Zone Contaminant Flux Evaluation at the Hanford BY-Cribs Site Using Forward and Imposed Concentration Modeling Approaches

2017 ◽  
Vol 4 (4) ◽  
pp. 771-797 ◽  
Author(s):  
M. Oostrom ◽  
M. J. Truex ◽  
M. L. Rockhold ◽  
T. C. Johnson
Keyword(s):  
Vadose Zone ◽  
Modeling Approaches ◽  
Contaminant Flux

scholarly journals Protective Capacity Assessment of Vadose Zone Material by Geo-Electrical Method: A Case Study of Pakistan

2016 ◽  
Vol 07 (05) ◽  
pp. 716-725 ◽  
Author(s):  
Yawar Hussain ◽  
Sadia Fida Ullah ◽  
Muhammad Babar Hussain ◽  
Hernan Martinez-Carvajal ◽  
Abdul Qayyum Aslam
Keyword(s):  
Vadose Zone ◽  
Capacity Assessment ◽  
Protective Capacity ◽  
Electrical Method

scholarly journals Model Package Report: Central Plateau Vadose Zone Models

2020 ◽  
Author(s):  
William Nichols ◽  
M Oostrom
Keyword(s):  
Vadose Zone ◽  
Central Plateau
Sign in / Sign up

Export Citation Format

Share Document