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Saslow, S.A., M.M.V. Snyder, A.R. Lawter, L. Zhong, B.N. Gartman, K.J. Cantrell, et al.
PNNL-28054, 64 pp, 2018

Perched water at the Hanford 200-DV-1 Operable Unit contains elevated concentrations of uranium, technetium-99, and nitrate and serves as a future flux of contamination into the groundwater. A pumping system currently removes contaminant mass from the perched water zone, but contamination that remains after pumping needs to be addressed with post-extraction mitigation approaches along with appropriate monitoring and selection of a suitable remediation endpoint. This report documents candidate post-extraction remediation option evaluations initiated in FY18: (1) a sequential reductive and sequestration approach; (2) permeation grouts for immobilization; and (3) a quasi-3D cylindrical model calibrated against pumping tests to identify potential extraction enhancements for the current pump-and-treat system. In addition, an alternative method for stimulating calcite precipitation was investigated with the injection of CO2 gas. https://www.osti.gov/biblio/1485489-evaluation-perched-water-post-extraction-remedy-technologies-interim-status-report

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