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Title: Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site

Abstract

Deep excavation of soil has been conducted at the 100-C-7 and 100-C-7:1 waste sites within the 100-BC Operable Unit at the Department of Energy (DOE) Hanford Site to remove hexavalent chromium (Cr(VI)) contamination with the excavations reaching to near the water table. Soil sampling showed that Cr(VI) contamination was still present at the bottom of the 100-C-7:1 excavation. In addition, Cr(VI) concentrations in a downgradient monitoring well have shown a transient spike of increased Cr(VI) concentration following initiation of excavation. Potentially, the increased Cr(VI) concentrations in the downgradient monitoring well are due to Cr(VI) from the excavation site. However, data were needed to evaluate this possibility and to quantify the overall impact of the 100-C-7:1 excavation site on groundwater. Data collected from a network of aquifer tubes installed across the floor of the 100-C-7:1 excavation and from temporary wells installed at the bottom of the entrance ramp to the excavation were used to evaluate Cr(VI) releases into the aquifer and to estimate local-scale hydraulic properties and groundwater flow velocity.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1063737
Report Number(s):
PNNL-21845; RPT-DVZ-AFRI-005
830403000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
chromium; flux; groundwater

Citation Formats

Truex, Michael J., Vermeul, Vincent R., Fritz, Brad G., Mackley, Rob D., Horner, Jacob A., Johnson, Christian D., and Newcomer, Darrell R. Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site. United States: N. p., 2012. Web. doi:10.2172/1063737.
Truex, Michael J., Vermeul, Vincent R., Fritz, Brad G., Mackley, Rob D., Horner, Jacob A., Johnson, Christian D., & Newcomer, Darrell R. Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site. United States. doi:10.2172/1063737.
Truex, Michael J., Vermeul, Vincent R., Fritz, Brad G., Mackley, Rob D., Horner, Jacob A., Johnson, Christian D., and Newcomer, Darrell R. Fri . "Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site". United States. doi:10.2172/1063737. https://www.osti.gov/servlets/purl/1063737.
@article{osti_1063737,
title = {Investigation of Hexavalent Chromium Flux to Groundwater at the 100-C-7:1 Excavation Site},
author = {Truex, Michael J. and Vermeul, Vincent R. and Fritz, Brad G. and Mackley, Rob D. and Horner, Jacob A. and Johnson, Christian D. and Newcomer, Darrell R.},
abstractNote = {Deep excavation of soil has been conducted at the 100-C-7 and 100-C-7:1 waste sites within the 100-BC Operable Unit at the Department of Energy (DOE) Hanford Site to remove hexavalent chromium (Cr(VI)) contamination with the excavations reaching to near the water table. Soil sampling showed that Cr(VI) contamination was still present at the bottom of the 100-C-7:1 excavation. In addition, Cr(VI) concentrations in a downgradient monitoring well have shown a transient spike of increased Cr(VI) concentration following initiation of excavation. Potentially, the increased Cr(VI) concentrations in the downgradient monitoring well are due to Cr(VI) from the excavation site. However, data were needed to evaluate this possibility and to quantify the overall impact of the 100-C-7:1 excavation site on groundwater. Data collected from a network of aquifer tubes installed across the floor of the 100-C-7:1 excavation and from temporary wells installed at the bottom of the entrance ramp to the excavation were used to evaluate Cr(VI) releases into the aquifer and to estimate local-scale hydraulic properties and groundwater flow velocity.},
doi = {10.2172/1063737},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {11}
}

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