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Title: Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report

Abstract

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 (NO 3), 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.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1485489
Report Number(s):
PNNL-28054
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English

Citation Formats

Saslow, Sarah A., Lawter, Amanda R., Gartman, Brandy N., Zhang, Zhuanfang, Snyder, Michelle M. V., Zhong, Lirong, Cantrell, Kirk J., and Brown, Christopher F. Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report. United States: N. p., 2018. Web. doi:10.2172/1485489.
Saslow, Sarah A., Lawter, Amanda R., Gartman, Brandy N., Zhang, Zhuanfang, Snyder, Michelle M. V., Zhong, Lirong, Cantrell, Kirk J., & Brown, Christopher F. Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report. United States. doi:10.2172/1485489.
Saslow, Sarah A., Lawter, Amanda R., Gartman, Brandy N., Zhang, Zhuanfang, Snyder, Michelle M. V., Zhong, Lirong, Cantrell, Kirk J., and Brown, Christopher F. Sun . "Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report". United States. doi:10.2172/1485489. https://www.osti.gov/servlets/purl/1485489.
@article{osti_1485489,
title = {Evaluation of Perched Water Post-Extraction Remedy Technologies: Interim Status Report},
author = {Saslow, Sarah A. and Lawter, Amanda R. and Gartman, Brandy N. and Zhang, Zhuanfang and Snyder, Michelle M. V. and Zhong, Lirong and Cantrell, Kirk J. and Brown, Christopher F.},
abstractNote = {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.},
doi = {10.2172/1485489},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 30 00:00:00 EDT 2018},
month = {Sun Sep 30 00:00:00 EDT 2018}
}

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