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Chlorinated Solvents in Fractured-Rock Aquifers

Hydrological, Geochemical, and Microbiological Processes that Affect Migration and Natural Attenuation of Chlorinated Solvents in Fractured-Sedimentary Rock — former Naval Air Warfare Center (NAWC) Research Site, West Trenton, NJ

Headlines

USGS and EPA hosted a Fractured Rock Workshop for EPA Region 1 Remedial Project Managers in Boston, November 17-18, 2015.
USGS presentations included:

  • Characterizing the Fate, Transport, and Remediation of DNAPLs in Fractured Rock Aquifers
  • Introduction to Geophysical Methods for Fractured Rock
  • Characterizing Contaminant Mass in the Rock Matrix
  • Profiling Transmissivity and Contamination in Fractures Intersecting Boreholes
  • Overview of Sampling Methods for Bedrock Monitoring Wells and Aquifers
  • Groundwater Flow over Larger Volumes of Rock: Cross-Hole Hydraulic Testing
  • Designing Tracer Tests for Site Characterization and Decision Support at Sites of Groundwater Contamination
  • Role of Numerical Modeling in Remedy Selection and Remedial Performance Evaluation
  • Bioaugmentation at a Fractured Rock Site: Naval Air Warfare Center, NJ
  • USGS Geophysical Research in Contaminated Fractured Rocks
  • USGS Hydraulic and Biogeochemical Research in Contaminated Fractured Rocks
See also EPA/USGS Fractured-Rock Remediation Technical Assistance brochure.

USGS scientists updated research progress through several presentations at the 2015 Geological Society of America (GSA) Annual Meeting, November 1-4, in Baltimore. Project scientists Claire Tiedeman and Michelle Lorah, along with Rutgers Prof. Lee Slater, co-chaired the Contaminant Transport, Fate, and Remediation in Fractured Rocks topical session.

Recent Publications

Geophysical ToolsEPAFractured Rock Geophysical Toolbox Method Selection Tool (FRGT-MST): Groundwater article by Day-Lewis et al. 2016
 
3D resistivity during transport in fracturesImaging Pathways in Fractured Rock using Three-Dimensional Electrical Resistivity Tomography: Groundwater article by Robinson et al. 2015Rutgers-Newark
 
Abiotic TCE DegradationAbiotic Dechlorination in Rock Matrices impacted by long-term exposure to TCE: Chemosphere article by Schaefer et al. 2015
 
Abiotic TCE DegradationDemonstration and Validation of a Fractured Rock Passive Flux Meter: SERDP report by Hatfield 2015U. of Florida
 
synthesis of core vocs and logsSynthesis of Rock Core VOCs with Borehole Logging and Hydrogeologic Framework: J. Contaminant Hydrology article by Goode et al. 2014
 
Carbon isotope changesCarbon Isotopes of VOCs, Microbial Community, and Deuterium Tracer used to Evaluate Bioaugmentation in Fractured Rock: J. Contaminant Hydrology article by Révész et al. 2014
 
slug testing at NAWCTransmissivity and Storage Coefficient Estimation by Slug Testing: USGS report by Fiore 2014
 
gene PCR NAWCBiogeochemistry and Genetics of Acetylene Fermentation: Geomicrobiology J. article by Miller et al. 2013
 
Heating SimulationDNAPL Remediation by Thermal Conductive Heating in Fractured Rock: ESTCP report by Lebrón et al. 2013U.S. Navy
 
TCE degradation ratesSite-scale TCE Degradation Rates from cisDCE and Chloride Production: Remediation article by Chapelle et al. 2012
 
SIR 2012-5032 coverVinyl Chloride and cisDCE Degradation under 'Anoxic' Conditions: USGS report by Bradley 2012
 
Block diagram of shallow rockReductive Dechlorination Requires Threshold Amounts of Organic Carbon: Remediation article by Chapelle et al. 2012
 
NAWC well locationsBiostimulation and Bioaugmentation Field Experiments show Increased cisDCE Degradation: Remediation article by Bradley et al. 2012
 
Mass removed by pump & treatContaminant Removal during 15 years of Pump & Treat Remediation: USGS report by Lacombe 2011
 
Interpreted geophysical cross sectionMapping, Coring, and Surface Geophysics Characterize Geologic Framework: J. Applied Geophysics article by Ellefsen et al. 2012
 
14C labeled degradation productsDistinct Vinyl Chloride and cisDCE Degradation under Low- and No-Oxygen Conditions: Ground Water Monitoring & Remediation article by Bradley & Chapelle 2011
 
Cover of GWMRHydrogeologic Framework Developed for Understanding Three-Dimensional Flow in Dipping Fractured Rocks: Ground Water Monitoring & Remediation article by Lacombe & Burton 2010
 
3D aquifer-test modelMulti-well Shutdown Tests are Effective for Characterizing Fractured Rock: Ground Water article by Tiedeman et al. 2010
 
Full Bibliography

Background

USGS began studies of contamination in fractured-sedimentary bedrock in cooperation with the U.S. Navy at the former Naval Air Warfare Center (NAWC), West Trenton, N.J. in 1993.

In 2001, the USGS Toxic Substances Hydrology Program initiated research at the NAWC to complement and expand the research being conducted on groundwater flow and contaminant transport in fractured bedrock at its Mirror Lake, New Hampshire, Research Site. The NAWC site was chosen because the general hydrogeologic framework was well defined and the site contained extensive contamination over a range of geochemical conditions. Site groundwater contains volatile organic compounds (VOC's) that include trichloroethene (TCE), cis-1,2-dichloroethene (cisDCE), and vinyl chloride.

Our research objectives are improved understanding of the hydrological, geochemical, and microbiological processes that affect the transport and fate of chlorinated solvents in fractured-sedimentary-rock aquifers, including the role of dense non-aqueous phase liquids (DNAPL) as a long-term residual source. We are also developing field methods for cost-effective subsurface characterization.

Research at the site is a multidisciplinary, collaborative effort that presently involves scientists from the USGS, U.S. Navy, and several academic and private institutions.

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