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URANIUM SEQUESTRATION: FIELD TEST TO REMEDIAL ACTION
Baynes, P.A., V.A. Rohay, F.C. Elloy, S. Mehta, R. Hermann, and G. Ng.
WM2017: Waste Management Conference, March 5-9, 2017, Phoenix, Arizona. Paper 17151, 2017
The 2013 Record of Decision for the 300 Area of the Hanford site requires DOE to use phosphate to sequester uranium over a 1.2-ha area by applying phosphate to the highest uranium concentration areas of the vadose zone and the periodically rewetted zone using a combination of surface infiltration, periodically rewetted zone injection, and shallow aquifer injection. Due to the difficulties inherent in scale-up from a limited field test to a full-scale remedial action, it was determined that uranium sequestration would occur in two sequential stages. Stage A would treat a 0.3-ha area, while Stage B would treat the remaining 0.9-ha area. The purpose of Stage A, which was implemented in November 2015, was to test the phosphate application approach on a smaller area, refine the process based on the results, and then implement it in a larger area. This paper describes the Stage A uranium sequestration process (objectives, observations, and conclusions), the sampling and monitoring approach, the physical sequestration system, and recommended changes for Stage B. http://www.wmsym.org/archives/2017/pdfs/FinalPaper_17151.pdf
WM2017: Waste Management Conference, March 5-9, 2017, Phoenix, Arizona. Paper 17151, 2017
The 2013 Record of Decision for the 300 Area of the Hanford site requires DOE to use phosphate to sequester uranium over a 1.2-ha area by applying phosphate to the highest uranium concentration areas of the vadose zone and the periodically rewetted zone using a combination of surface infiltration, periodically rewetted zone injection, and shallow aquifer injection. Due to the difficulties inherent in scale-up from a limited field test to a full-scale remedial action, it was determined that uranium sequestration would occur in two sequential stages. Stage A would treat a 0.3-ha area, while Stage B would treat the remaining 0.9-ha area. The purpose of Stage A, which was implemented in November 2015, was to test the phosphate application approach on a smaller area, refine the process based on the results, and then implement it in a larger area. This paper describes the Stage A uranium sequestration process (objectives, observations, and conclusions), the sampling and monitoring approach, the physical sequestration system, and recommended changes for Stage B. http://www.wmsym.org/archives/2017/pdfs/FinalPaper_17151.pdf
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