Characterization of Persistent Volatile Contaminant Sources in the Vadose Zone

Journal Article · Wed May 01 04:00:00 EDT 2013 · Ground Water Monitoring and Remediation, 33(2):68-84

DOI:https://doi.org/10.1111/gwmr.12006· OSTI ID:1086384

Carroll, Kenneth C.; Truex, Michael J.; Brusseau, Mark L.; Parker, Kyle R.; Mackley, Rob D.; Rohay, Virginia J.

Remediation activities over time will alter the subsurface distribution of contaminants and likely create significant changes in the source-zone architecture. A field method was demonstrated for use of data collected from multiple individual soil vapor extraction (SVE) system well tests to locate and characterize the distribution of persistent VOC sources in the vadose zone. Operational data collected at the Department of Energy’s Hanford site were used to examine source zone alteration over time due to SVE operation and to illustrate the source-zone characterization approach. Individual well test results confirmed a heterogeneous distribution of permeability and contaminant mass discharge throughout the vadose zone. The trends in mass discharge and concentration were analyzed to determine the location and extent of the primary source zone within a lower-permeability unit at the site. This information is useful to evaluate the performance of SVE operations, and support decisions concerning system alteration or closure based on risk assessments of the impact of vadose-zone sources on groundwater contamination or vapor intrusion.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1086384
• Report Number(s): PNNL-SA-89088; EY4049110
• Journal Information: Ground Water Monitoring and Remediation, 33(2):68-84, Journal Name: Ground Water Monitoring and Remediation, 33(2):68-84
• Country of Publication: United States
• Language: English

Related Subjects

Mass Flux
Remediation
SVE
Soil Vapor Extraction
VOC
Vadose Zone
carbon tetrachloride