Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report
In the 200-DV-1 Operable Unit at Hanford, a perched water zone is located in a fine-grained unit a few meters above the water table within the B, BX, and BY Tank Farms area. The perched water contains elevated concentrations of uranium (U), technetium-99 (99Tc), and nitrate (NO3), and serves as a future flux of contaminated water into the groundwater. Currently, a pumping system is used for removal of contaminant mass from the perched water zone to decrease the total contaminant mass transported into the groundwater. As the perched water zone is desaturated through pumping, removal of the contaminated perched water will become more difficult over time. Water extraction cannot remove all of the contaminant mass from this zone, nor can it stop the recharge-driven flux of remaining contaminants toward the groundwater because the flux will continue under unsaturated conditions. Thus, contamination that will remain after pumping needs to be addressed with post-extraction mitigation approaches along with appropriate monitoring and selection of a suitable remediation endpoint.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1485489
- Report Number(s):
- PNNL-28054
- Country of Publication:
- United States
- Language:
- English
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