Document Detail

Assessing performance and closure for soil vapor extraction: Integrating vapor discharge and impact to groundwater quality.
MedLine Citation:
PMID:  22192346     Owner:  NLM     Status:  In-Data-Review    
Soil vapor extraction (SVE) is typically effective for removal of volatile contaminants from higher-permeability portions of the vadose zone. However, contamination in lower-permeability zones can persist due to mass transfer processes that limit the removal effectiveness. After SVE has been operated for a period of time and the remaining contamination is primarily located in lower-permeability zones, the remedy performance needs to be evaluated to determine whether the SVE system should be optimized, terminated, or transitioned to another technology to replace or augment SVE. Numerical modeling of vapor-phase contaminant transport was used to investigate the correlation between measured vapor-phase mass discharge, MF(r), from a persistent, vadose-zone contaminant source and the resulting groundwater contaminant concentrations. This relationship was shown to be linear, and was used to directly assess SVE remediation progress over time and to determine the level of remediation in the vadose zone necessary to protect groundwater. Although site properties and source characteristics must be specified to establish a unique relation between MF(r) and the groundwater contaminant concentration, this correlation provides insight into SVE performance and support for decisions to optimize or terminate the SVE operation or to transition to another type of treatment.
Kenneth C Carroll; Mart Oostrom; Michael J Truex; Virginia J Rohay; Mark L Brusseau
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Publication Detail:
Type:  Journal Article     Date:  2011-10-20
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  128     ISSN:  1873-6009     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2011-12-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  71-82     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Pacific Northwest National Laboratory, Richland, WA, USA.
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