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2024
Werkema, D., N. Terry, M. Briggs, B. Trottier, AND E. Rutila. ELECTROMAGNETIC, MAGNETOMETRY, AND THERMAL MAPPING OF GROUNDWATER SEEPS IMPACTED BY MINE INFLUENCED WATER FROM ABANDONED HARDROCK MINES NEAR SILVERTON, CO. Symposium on the Application of Geophysics to Environmental and Engineering Problems, Tucson, AZ, March 24 - 28, 2024.
Falzone, S., C. Schaefer, E. Siegenthaler, K. Keating, D. Werkema, AND L. Slater. Geophysical Signatures of Soil AFFF Contamination from Spectral Induced Polarization and Low Field Nuclear Magnetic Resonance Methods. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 260:104268, (2024). https://doi.org/10.1016/j.jconhyd.2023.104268
Werkema, D., F. Day-Lewis, L. Slater, C. Johnson, N. Terry, AND J. Lane. What's holding geophysics back. Symposium on the Applications of Geophysics to Environmental and Engineering Problems, Tucson, AZ, March 24 - 29, 2024.
2023
Thomle, J., D. Werkema, F. Day-Lewis, P. Jaysaval, AND T Chris Mochon Collura. AN INVESTIGATION OF THE SUBSURFACE FRESHWATER/SALTWATER DISTRIBUTION IN AN ESTUARINE ENVIRONMENT USING TOWED TIME DOMAIN ELECTROMAGNETIC METHODS. Symposium on the Application of Geophysics to Environmental and Engineering Problems, New Orleans, LA, April 03 - 06, 2023.
Werkema, D., N. Terry, AND B. Trottier. BPMD Mayflower Section of the Animas River, Silverton, CO. Geophysical Surveys for Groundwater – Surface Water Characteristics. Bonita Peak Mining District Community Meeting, Silverton, CO, July 11, 2023.
Werkema, D. Environmental Geophysics Overview, Research, and Applications. ROCS-Net PESD meeting, newport, OR, October 04 - 19, 2023.
Werkema, D. Environmental Geophysics: Basic Concepts, Applications, Examples, and Resources. EPA Groundwater Forum meeting, corvallis, OR, July 13, 2023.
Terry, N., F. Day-Lewis, J. Lane, C. Johnson, AND D. Werkema. Field evaluation of semi-automated moisture estimation from geophysics using machine learning. Vadose Zone Journal. Soil Science Society of America, Madison, WI, 22(2):e20246, (2023). https://doi.org/10.1002/vzj2.20246
Werkema, D., S. Falzone, E. Siegenthaler, A. Avelar, D. Ntarlagiannis, K. Keating, L. Slater, AND C. Schaefer. Locating, Identifying, and Characterizing PFAS Impacted Soils in the Field with Spectral Induced Polarization. EPA, State, and Tribal Bimonthly PFAS science call webinar, online, OR, December 11, 2023.
Avelar, A., D. Ntarlagiannis, K. Peshtani, C. Schaefer, D. Werkema, AND L. Slater. Spectral Induced Polarization Signatures of PFAS-contaminated soils. American Geophysical Union, San Francisco, CA, December 11 - 15, 2023.
Werkema, D., F. Day-Lewis, C. Johnson, N. Terry, AND J. Lane. WHAT’S THE PROBLEM WITH GEOPHYSICS? Symposium on the Application of Geophysics to Environmental and Engineering Problems, New Orleans, LA, April 03 - 06, 2023.
2022
McAliley, W., F. Day-Lewis, D. Rey, M. Briggs, A. Shapiro, AND D. Werkema. Application of Recursive Estimation to Heat Tracing for Groundwater/Surface-Water Exchange. WATER RESOURCES RESEARCH. American Geophysical Union, Washington, DC, 58(6):e2021WR030443, (2022). https://doi.org/10.1029/2021WR030443
Glaser, D., R. Henderson, D. Werkema, T. Johnson, AND R. Versteeg. Estimating Biofuel Contaminant Concentration from 4D ERT with Mixing Models. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 248:104027, (2022). https://doi.org/10.1016/j.jconhyd.2022.104027
Trottier, B., R. Versteeg, D. Werkema, A. Meyal, G. Partridge, AND C. Johnson. GEOPHYSICAL ANALYSIS OF PERMEABLE PAVEMENT INFILTRATION DURING SIMULATED RAINFALL EVENTS. Symposium for the Application of Geophysics to Environmental and Engineering Problems (SAGEEP), Denver, CO, March 20 - 24, 2022.
Hammett, S., F. Day-Lewis, B. Trottier, P. Barlow, M. Briggs, G. Delin, J. Harvey, C. Johnson, J. Lane, Jr, D. Rosenberry, AND D. Werkema. GW/SW-MST: A Groundwater/Surface-Water Method Selection Tool. Groundwater. Wiley-Blackwell, Hoboken, NJ, , 13194, (2022). https://doi.org/10.1111/gwat.13194
Werkema, Dale. Geophysics applications to LUST sites: case studies and online tools. 27th National Tanks Conference & Exposition, Pittsburg, PA, September 13 - 15, 2022.
2021
DeWitt, Ted, Cheryl A. Brown, Dale Werkema, C. Hernandez, C. Jackson, S. Pacella, AND M. Harwell. EPA Research to Protect Coastal Ecosystems and Communities. Hatfield Marine Science Center's Marine Science Day 2021, Newport, OR, April 10, 2021.
Falzone, S., E. Siegenthaler, C. Schaefer, K. Keating, Dale Werkema, AND L. Slater. Early Evidence for Complex Resistivity as a Geophysical Field Method to Delineate PFAS Contamination. RemPlex: 2021 Global Summit on Environmental Remediation; Center for the Remediation of Complex Sites (RemPlex), Richmond, Washington, November 08 - 12, 2021.
Terry, N., Dale Werkema, F. Day-Lewis, AND J. Lane Jr. FIELD ASSESSMENT OF FDEM AND GPR TO RESOLVE SOIL MOISTURE VARIATIONS USING MACHINE LEARNING. Symposium on the Application of Geophysics to Environmental and Engineering Problems, Denver, CO, March 10, 2021.
2020
Domanski, M., D. Quinn, F. Day-Lewis, M. Briggs, D Werkema, AND J. Lane Jr. DTSGUI: A Python Program to Process and Visualize Fiber‐Optic Distributed Temperature Sensing Data. Groundwater. Wiley-Blackwell, Hoboken, NJ, 58(5):799-804, (2020). https://doi.org/10.1111/gwat.12974
Terry, N., R. Runkel, Dale Werkema, E. Rutila, X. Comas, M. Warren, A. Kristiyono, AND D. Murdiyarso. Exploring the potential of ground-penetrating radar (GPR) to measure the extent of chronic disturbance in peatlands: examples from acid mine drainage and peat fire. International Conference on Ground Penetrating Radar, Golden, CO, June 14 - 19, 2020. https://doi.org/10.1190/gpr2020-015.1
Werkema, Dale. Forward to the FastTIMES Special Issue on Contaminant Geophysics. FastTIMES. Environmental and Engineering Geophysical Society, Denver, CO, 25(2):30, (2020).
Johnson, C., K. Pappas, E. White, Dale Werkema, N. Terry, R. Ford, S. Phillips, K. Limes, AND J. Lane Jr. Geophysical Assessment of a Proposed Landfill Site in Fredericktown, Missouri. FastTIMES. Environmental and Engineering Geophysical Society, Denver, CO, 25(2):98-106, (2020).
Werkema, Dale. Geophysical tools for on-scene coordinators: practical non-intrusive applications to assess and characterize the subsurface. Region 7 Annual On-Scene Coordinators Training, Lenexa, Kansas, January 13 - 17, 2020.
2019
Sherrod, L., W. Sauck, E. Simpson, D Werkema, AND J. Swiontek. Case Histories of GPR for Animal Burrows Mapping and Geometry. JOURNAL OF ENVIRONMENTAL AND ENGINEERING GEOPHYSICS. Environmental and Engineering Geophysical Society, Denver, CO, 24(1):1-17, (2019).
WERKEMA, D. D., S. D. ACREE, R. R. ROSS, AND R. G. FORD. Cost Effective Tools for Assessment of Infiltration at Green Infrastructure Stormwater Management Sites. U.S. Environmental Protection Agency, Washington, DC, EPA/600/F-19/141, 2019.
Werkema, D. Geophysical applications for mine waste site objectives. 2019 CLU-IN Webinar Series: ORD Mining and Mineral Processing Site - Site Characterization, Corvallis, OR, October 02, 2019.
Scruggs, C., M. Briggs, F. Day-Lewis, D Werkema, AND J. Lane. The Dual‐Domain Porosity Apparatus: Characterizing Dual Porosity at the Sediment/Water Interface. Groundwater. Wiley-Blackwell, Hoboken, NJ, 57(4):640-646, (2019). https://doi.org/10.1111/gwat.12846
Day-Lewis, F., M. Briggs, J. Lane Jr., AND D Werkema. Using Temperature Measurements to Map and Quantify Flow across the Sediment/Water Interface. 2019 Sediments Conference, New Orleans, LA, February 11 - 14, 2019.
2018
Werkema, D. Environmental Geophysics Applied to Site Characterization, Plume Mapping, and Remediation Monitoring. webinar, webinar, Webinar, October 15, 2018.
Saneiyan, S., D. Ntarlagiannis, D Werkema, AND A. Ustra. Geophysical Methods for Monitoring Soil Stabilization Processes. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science Ltd, New York, NY, 148:234-244, (2018).
Werkema, D. Geophysics for LUST Sites. 26th National Tanks Conference & Exposition (NTC), Louisville, KY, September 11 - 13, 2018.
Briggs, M., J. Harvey, S. Hurley, D. Rosenberry, T. McCobb, D Werkema, AND J. Lane. Hydrogeochemical controls on brook trout spawning habitats in a coastal stream. HYDROLOGY AND EARTH SYSTEM SCIENCES. EGS, 22(12):6383-6398, (2018). https://doi.org/10.5194/hess-22-6383-2018
Terry, N., F. Day-Lewis, D Werkema, AND J. Lane. MoisturEC: A New R Program for Moisture Content Estimation from Electrical Conductivity Data. GROUNDWATER MONITORING AND REMEDIATION. National Ground Water Association, Westerville, OH, 56(5):823-831, (2018). https://doi.org/10.1111/gwat.12650
2017
Day-Lewis, F., L. Slater, J. Robinson, C. Johnson, N. Terry, AND D Werkema. An overview of geophysical technologies appropriate for characterization and monitoring at fractured-rock sites. JOURNAL OF ENVIRONMENTAL MANAGEMENT. Elsevier Science Ltd, New York, NY, 204(2):709-720, (2017).
Abdel Aal, G., E. Atekwana, AND D Werkema. Complex conductivity response to silver nanoparticles in partially saturated sand columns. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science Ltd, New York, NY, 137:73-81, (2017).
Saneiyan, S., D. Ntarlagiannis, AND D Werkema. Induced Polarization for Characterizing and Monitoring Soil Stabilization Processes. 2017 AGU Fall Meeting, New Orleans, LA, December 11 - 15, 2017.
Terry, N., F. Day-Lewis, J. Robinson, L. Slater, K. Halford, A. Binley, J. Lane Jr., AND D Werkema. Scenario Evaluator for Electrical Resistivity Survey Pre-modeling Tool. Groundwater Monitoring & Remediation. Wiley-Blackwell Publishing, Hoboken, NJ, 55(6):885-890, (2017).
Sharma, S., L. Slater, D. Ntarlagiannis, D Werkema, AND Z. Szabo. Specific polarizability of sand–clay mixtures with varying ethanol concentration. Near Surface Geophysics. John Wiley & Sons, Inc., Hoboken, NJ, 15(6):615-624, (2017). https://doi.org/10.3997/1873-0604.2017049
2016
Briggs, M., S. Buckley, A. Bagtzoglou, D Werkema, AND J. Lane. Actively Heated High-Resolution Fiber-Optic Distributed Temperature Sensing to Quantify Flow Dynamics in Zones of Strong Groundwater Upwelling. WATER RESOURCES RESEARCH. American Geophysical Union, Washington, DC, 52(7):5179-5194, (2016).
Werkema, D. Geophysical detection methods/GTDSS. Sustainable and Healthy Communities BOSC Subcommittee, OH, Cincinnati, November 02 - 04, 2016.
Briggs, M., J. Lane, F. Day-Lewis, C. Snyder, S. Hurley, N. Hitt, E. White, Z. Johnson, D. Nelms, D Werkema, AND A. Bagtzoglou. Groundwater Flowpath Controls on Seepage Temperature and Future Cold Water Stream Habitat. 2016 Geological Society of America Fall Meeting, Denver, CO, September 25 - 28, 2016.
2015
Karaoulis, M., D Werkema, AND A. Revil. 2D Time-lapse Seismic Tomography Using An Active Time Constraint (ATC) Approach. Journal of Geophysics. Springer, New York, NY, 34(2):206-212, (2015).
Werkema, D, E. Atekwana, AND G. Abdel Aal. Spectral Induced Polarization Measurements of Nanoparticles in Laboratory Column Experiments. Symposium on the application of Geophysics to Environmental and Engineering Problems (SAGEEP), Austin, TX, March 22 - 26, 2015.
2014
Atekwana, E., G. Abdel Aal, AND D Werkema. Detection of Silver Nanoparticles in Vadose Zone Environments using Complex ConductivityMeasurements. Presented at 20th European Meeting of Environmental and Engineering Geophysics, Athens, GREECE, September 14 - 18, 2014.
Heenan, J., D. Ntarlagiannis, L. Slater, J. Nolan, E. Atekwana, C. Ross, E. Atekwana, B. Fathepure, AND D Werkema. Electrical Resistivity Imaging for Long-Term Monitoring of Contaminant Degradation. Presented at 2014 Gulf of Mexico Oil Spill & Ecosystem Science Conference, Mobile, AL, January 28, 2014.
2013
Personna, R., L. Slater, D. Ntarlagiannis, D. Werkema, AND Z. Szabo. Electrical Signatures of Ethanol-Liquid Mixtures: Implications for Monitoring Biofuels Migration in the Subsurface. JOURNAL OF CONTAMINANT HYDROLOGY. Elsevier Science Ltd, New York, NY, 144:99-107, (2013).
Abdel, G., E. Atekwana, AND D Werkema. On the Sensitivity of SIP to the Presence and Transport of Nanoparticles in Saturated Porous Media. Presented at American Geophysical Union Fall Meeting, San Francisco, CA, December 09 - 13, 2013.
Glaser, D., D. Werkema, R. Verstegg, R. Henderson, AND D. Rucker. Temporal GPR Imaging of an Ethanol Release Within a Laboratory-Scaled Sand Tank. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science Ltd, New York, NY, 86:133-145, (2013).
Karaoulis, M., A. Revil, J. Zhang, AND D. Werkema. Time-Lapse Joint Inversion of Cross-Well DC Resistivity and Seismic Data: A Numerical Investigation. GEOPHYSICS. Society of Exploration Geophysicists, 77(4):141-157, (2013).
2012
Sherrod, L., W. Sauck, AND D. D. WERKEMA. A Low-Cost, In Situ Resistivity and Temperature Monitoring System. GROUNDWATER MONITORING AND REMEDIATION. National Ground Water Association, Westerville, OH, 0(0):1-27, (2012).
Rajabdeen, M., B. Luke, AND D Werkema. Evaluation of the Seismic Characterision of Select Engineered Nanoparticles in Saturated Glass Beads. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-12/547, 2012.
Mewafy, F. M., E. A. Atekwana, D. D. WERKEMA, L. D. Slater, D. Ntarlagiannis, A. Revil, M. Skold, AND G. N. Delin. Magnetic Susceptibility as a Proxy for Investigating Microbial Mediated Iron Reduction. GEOPHYSICAL RESEARCH LETTERS. American Geophysical Union, Washington, DC, 38(0):1-5, (2012).
Ong, J., D. Werkema, AND J. Lane. Revisiting the Fully Automated Double-Ring Infiltrometer Using Open-Source Electronics. Presented at American Geophysical Union Fall Meeting, San Francisco, CA, December 03 - 07, 2012.
Karaoulis, M., A. Revil, D. D. WERKEMA, B. Minsley, W. F. Woodruff, AND A. Kemna. Time-Lapse 3D Inversion of Complex Conductivity Data Using an Active Time Constrained (ATC) Approach. Journal of Geophysics. Springer, New York, NY, 1:1-41, (2012).
2011
Schmutz, M., A. Revil, P. Vaudelet, M. Batzle, P. Vinao, AND D. D. WERKEMA. Influence of Oil Saturation Upon Spectral Induced Polarization of Oil Bearing Sands. JOURNAL OF GEOPHYSICAL RESEARCH. American Geophysical Union, Washington, DC, (183):211-224, (2011).
Abdel Aal, G. Z., E. A. Atewana, S. Rossbach, AND D. D. WERKEMA. Sensitivity of Geoelectrical Measurements to the Presence of Bacteria in Porous Media. Journal of Geophysical Research: Biogeosciences. American Geophysical Union, Washington, DC, 115:1-11, (2011).
Personna, Y. R., L. D. Slater, D. Ntarlagiannis, D. D. WERKEMA, AND Z. Szabo. Spectral Induced Polarization Signatures of Ethanol in Sand-Clay Medium. Presented at Second International Workshop on Induced Polarization in Near-Surface Geophysics, Golden, CO, October 31 - November 02, 2011.
2010
WERKEMA, D. D., D. R. GLASER, R. Joyce, D. Hawkins, E. Atekwana, AND G. Z. Abdel Aal. A Feasibility Study on the Geophysical Response to Nanoparticles in the Subsurface. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-10/105, 2010.
Davis, C. A., L. J. Pyrak-Nolte, E. A. Atekwana, D. D. WERKEMA, AND M. E. Haugen. Acoustic and Electrical Property Changes Due to Microbial Growth and Biofilm Formation in Porous Media . Journal of Geophysical Research: Biogeosciences. American Geophysical Union, Washington, DC, 115:1-14, (2010).
Hawkins, D., M. Mcguire, G. Z. Abdel Aal, E. A. Atekwana, AND D. D. WERKEMA. Laboratory Assessment of Nano-Silver Transport in Sand Columns Using Complex Conductivity Measurements. Presented at Symposium on the Applications of Geophysics to Environmental and Engineering Problems, Keystone, CO, April 11 - 15, 2010.
WERKEMA, D. D., M. JACKSON, AND D. R. GLASER. The Environmental Geophysics Web Site and Geophysical Decision Support System (GDSS). U.S. Environmental Protection Agency, Washington, DC, EPA/600/C-10/004, 2010.
2009
Davis, C. A., L. J. Pyrak-Nolte, E. A. Atekwana, AND D. D. WERKEMA. Acoustic Wave Monitoring of Biofilm Development in Porous Media. Presented at American Geophysical Union Spring Joint Assembly Meeting, Toronto, QC, CANADA, May 24 - 27, 2009.
Henderson, R. D., D. D. WERKEMA, R. J. Horton, AND J. W. Lane. Broadband Geoelectrical Signatures of Water and Ethanol Solutions in Ottawa Sand. Presented at American Geophysical Union Fall 2009 Conference, Las Vegas, NV, December 14 - 18, 2009.
Henderson, R. D., D. D. WERKEMA, R. J. Horton, AND J. W. Lane. Broadband Geoelectrical Signatures of Water-Ethanol Solutions in Ottawa Sand. Presented at American Geophysical Union Fall 2009 Meeting, San Francisco, CA, December 14 - 18, 2009.
Rajabdeen, N., B. Luke, AND D. D. WERKEMA. Detecting Seismic Characteristics of Select Engineered Nanomaterials in Granular Media. Presented at UNLV Civil Engineering Department, Las Vegas, NV, November 02, 2009.
Davis, C. A., L. J. Pyrak-Nolte, E. A. Atekwana, D. D. WERKEMA, AND M. E. Haugen. Microbial-Induced Heterogeneity in the Acoustic Properties of Porous Media . GEOPHYSICAL RESEARCH LETTERS. American Geophysical Union, Washington, DC, 36:21405-21410, (2009).
WERKEMA, D. D., R. Joyce, AND E. Atekwana. Preliminary Results from a Feasibility Study of the Geoelectrical Response to Select Nanomaterials in a Sand Matrix. Presented at NCER Nano Grantees Meeting, Las Vegas, NV, November 09, 2009.
Davis, C. A., L. J. Pyrak-Nolte, E. A. Atekwana, D. D. WERKEMA, AND M. E. Haugen. Spatial & Temporal Geophysical Monitoring of Microbial Growth and Biofilm Formation. Presented at American Geophysical Union Fall 2009 Conference, Las Vegas, NV, December 14 - 18, 2009.
Davis, C. A., L. Pyrak-Nolte, E. Atekwana, D. D. WERKEMA, M. Haugen, AND D. R. Glaser. Spatial and Temporal Geophysical Monitoring of Microbial Growth and Biofilm Formation. Presented at American Geophysical Union Fall 2009 Meeting, San Francisco, CA, December 14 - 18, 2009.
Vukenkeng, C., E. Atekwana, E. Atekwana, W. Sauck, AND D. D. WERKEMA. Temporal Geophysical Signatures Due to Contaminant Mass Remediation . GEOPHYSICS. Society of Exploration Geophysicists, 74(4):1-11, (2009).
2008
Joyce, R., C. Vukenkeng, E. Atekwana, E. Atekwana, D. D. WERKEMA, S. Rossbach, G. Abdel, C. Davis, AND J. Nolan. TEMPORAL GEOPHYSICAL INVESTIGATIONS OF THE FT-2-PLUME AT THE WURTSMITH AIR FORCE BASE, OSCODA, MICHIGAN. Presented at Symposium on the Applications of Geophysics to Environmental and Engineering Problems, Philadelphia, PA, April 06 - 10, 2008.
Joyce, R., D. D. WERKEMA, E. Atekwana, AND E. Atekwana. COMPLEX CONDUCTIVITY RESPONSE TO NANOMATERIALS IN A SAND MATRIX. Presented at American Geophysical Union Fall Annual Meeting, San Francisco, CA, December 15, 2008.
Joyce, R., D. D. WERKEMA, E. A. Atekwana, AND E. A. Atekwana. Complex Conductivity Response to Nanomaterials in a Sand Matrix . Presented at American Geophysical Union Fall Annual Meeting, San Francisco, CA, December 14 - 18, 2008.
Magill, M. T., D. D. WERKEMA, AND D. K. Kreamer. GEOELECTRICAL MEASUREMENTS OF COMMON SEAR SURFACTANTS IN ANALOG AQUIFER MATERIALS. Presented at UNLV Geosymposium, Las Vegas, NV, April 25, 2008.
Vukenkeng, C., E. A. Atekwana, E. A. Atekwana, S. Rossback, W. A. Sauck, D. D. WERKEMA, J. Nolan, AND L. Slater. GEOPHYSICAL AND GEOCHEMICAL ATTENUATED SIGNATURES ASSOCIATED WITH A HYDROCARBON CONTAMINATED SITE UNDERGOING BIOREMEDIATION. Presented at Society of Exploration Geophysicist Annual Meeting, Las Vegas, NV, November 10 - 14, 2008.
Davis, C. A., L. J. Pyrak, E. A. Atekwana, M. E. Haugen, AND D. D. WERKEMA. INVESTIGATING THE EFFECT OF MICROBIAL GROWTH AND BIOFILM FORMATION ON SEISMIC WAVE PROPAGATION IN POROUS MEDIA. Presented at American Geophysical Union Chapman Conference on Biogeophysics, Portland, MA, October 13 - 16, 2008.
Davis, C., L. Pyrak-Nolte, E. Atekwana, M. Haugen, AND D. D. WERKEMA. INVESTIGATING THE EFFECT OF MICROBIAL GROWTH AND BIOFILM FORMATION ON SEISMIC WAVE PROPAGATION IN SEDIMENT. Presented at American Geophysical Union Chapman Conference on Biogeophysics, Portland, MA, October 13 - 16, 2008.
WERKEMA, D. D. REPORT ON THE GEOELECTRICAL DETECTION OF SURFACTANT ENHANCED AQUIFER REMEDIATION OF PCE: PROPERTY CHANGES IN AQUEOUS SOLUTIONS DUE TO SURFACTANT TREATMENT OF PERCHLOROETHYLENE: IMPLICATIONS TO GEOPHYSICAL MEASUREMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-08/031, 2008.
Magill, M., D. D. WERKEMA, AND D. Kreamer. Spectral Induced Polarization Response of Unconsolidated Saturated Sand and Surfactant Solutions. Presented at American Geophysical Union Fall Annual Meeting, San Francisco, CA, December 15, 2008.
Magill, M. T., D. D. WERKEMA, AND D. K. Kreamer. Spectral Induced Polarization Response of Unconsolidated Saturated Sand and Surfactant Solutions . Presented at American Geophysical Union Fall Annual Meeting, San Francisco, CA, December 14 - 18, 2008.
Vukenkeng, C., E. Atekwana, E. Atekwana, AND D. D. WERKEMA. Temporal Geophysical Investigations of the FT-2-Plume at the Wurtsmith Air Force Base, Oscoda, Michigan. Presented at Symposium on the Application of Geophysics to Environmental and Engineering Problems, Philadelphia, PA, April 06 - 10, 2008.
Vukengkeng, C., E. A. Atekwana, E. A. Atekwana, W. A. Sauck, S. Rossback, L. Slater, J. Nolan, AND D. D. WERKEMA. USING GEOPHYSICAL SIGNATURES TO INVESTIGATE TEMPORAL CHANGES DUE TO SOURCE REDUCTION IN THE SUBSURFACE CONTAMINATED WITH HYDROCARBONS (1). Presented at American Geophysical Union Chapman Conference on Biogeophysics, Portland, MA, October 13 - 16, 2008.
Vukengkeng, C., E. A. Atewanta, E. A. Atekwana, W. A. Sauck, S. Rossbach, J. Nolan, AND D. D. WERKEMA. Using Geophysical Signatures to Investigate Temporal Changes Due to Source Reduction in the Subsurface Contaminated with Hydrocarbons. Presented at AGU Chapman Conference on Biogeophysics, Portland, MA, October 13 - 16, 2008.
2007
WERKEMA, D. D. Property changes in Aqueous Solutions Due to Surfactant Treatment of PCE: Implications to Geophysical Measurements. Presented at American Geophysical Union Fall 2007 Meeting, San Francisco, CA, December 10 - 14, 2007.
WERKEMA, D. D. PROPERTY CHANGES IN AQUEOUS SOLUTIONS DUE TO SURFACTANT TREATMENT OF PCE: IMPLICATIONS TO GEOPHYSICAL MEASUREMENTS. Presented at American Geophysical Union Fall 2007 Meeting, San Francisco, CA, December 10 - 14, 2007.
2006
SAUCK, W., E. ATEKWANA, AND D. D. WERKEMA. AN UPDATED MODEL FOR THE ANOMALOUS RESISITIVITY OF LNAPL PLUMES IN SANDY ENVIRONMENTS. Presented at Spring American Geophysical Union Joint Assembly, Baltimore, MD, May 23 - 26, 2006.
ATEKEWANA, E., D. D. WERKEMA, AND E. ATEKWANA. BIOGEOPHYSICS: THE EFFECTS OF MICROBIAL PROCESSES ON GEOPHYSICAL PROPERTIES OF THE SHALLOW SUBSURFACE. Chapter 6, H. Vereecken (ed.), Applied Hydrogeophysics. Springer-Verlag, New York, NY, 1:161-193, (2006).
WERKEMA, D. D., E. A. ATCKWANA, AND E. A. ATCKWANA. CONDUCTIVITY PROFILE RATE OF CHANGE FROM FIELD AND LABORATORY DATA WITHIN BIODEGRADING PETROLEUM HYDROCARBON. Presented at Symposium on the Application of Geophysics to Environmental and Engineering Problems, Bellevue, WA, April 02 - 06, 2006.
WERKEMA, D. D. GEOPHYSICS APPLIED TO CONTAMINANT STUDIES: PAPERS PRESENTED AT SAGEEP FROM 1988 TO 2006. Syposium on the Application of Geophysics to Engineering & Environmental Problems, Seattle, WA, April 03 - 07, 2006. Werkema, Douglas D. (ed.), Environmental and Engineering Geophysical Society, Denver, CO, 1(1):0, (2006).
WERKEMA, D. D. AND S. P. GARDNER. HIGH RESOLTUION GEOELECTRICAL MEASUREMENTS OF BIODEGRADATION AND SURFACTANT REMEDIATION: LAB AND FIELD STUDES AND A NEW CHARACTERIZATION TEST CELL FIELD RESEARCH SITE. Presented at High Resolution Site Characterization & Monitoring Symposium, Long Beach, CA, November 14 - 16, 2006.
WERKEMA, D. D., E. ATEKEWANA, E. ATEKEWANA, S. ROSSBACH, J. DURIS, J. ALLEN, L. SMART, AND W. SAUCK. MONITORING HYDROCARBON BIODEGRADTION WITH DC RESISTITY. Presented at Application of Geophysics to Environmental & Engineering Problems, Seattle, WA, April 02 - 06, 2006.
WERKEMA, D. D., E. ATEKWANA, AND E. ATEKWANA. SLDE PRESENTATION FOR CONDUCTIVITY PROFILE RATE OF CHANGE FROM FIELD AND LABORATORY DATA WITHIN BIODEGRADING PETROLEUM HYDROCARBON. Presented at Symposium on the Application of Geophysics to Environmental Engineering Problems, Bellevue, WA, April 02 - 06, 2006.
2005
WERKEMA, D. D. CAN GEOELECTRICAL METHODS BE USED TO MONITOR NAPL REMEDIATION EFFORTS? Presented at EPA 2005 Science Forum, Washington, DC, May 16 - 18, 2005.
2004
Atekwana, E., E. A. Atekwana, S. Rossbach, D Werkema, J. W. Duris, L. Smart, J. Allen, D. P. Cassidy, AND W. Sauck. EVIDENCE FOR MICROBIAL ENHANCED ELECTRICAL CONDUCTIVITY IN HYDROCARBON-CONTAMINATED SEDIMENTS. GEOPHYSICAL RESEARCH LETTERS. American Geophysical Union, Washington, DC, 31:1-4, (2004).
Atekwana, E., D Werkema, J. W. Duris, S. Rossbach, E. A. Atekwana, W. Sauck, D. P. Cassidy, J. C. Means, AND F. Legall. IN SITU APPARENT CONDUCTIVITY MEASUREMENTS AND MICROBIAL POPULATION DISTRIBUTION AT A HYDROCARBON CONTAMINATED SITE. GEOPHYSICS 69(1):56-63, (2004).
Werkema, D. INDIRECT MEASUREMENT OF BIOLOGICAL ACTIVITY TO MONITOR NATURAL ATTENUATION. Presented at EPA Science Forum 2004, Washington, DC, June 1-3, 2004.
Werkema, D, E. Atekwana, E. Atekwana, J. W. Duris, S. Rossbach, J. Allen, AND W. Sauck. LABORATORY AND FIELD RESULTS LINKING HIGH BULK CONDUCTIVITIES TO THE MICROBIAL DEGRADATION OF PETROLEUM HYDROCARBONS. Presented at 2004 Symposium on the Applications of Geophysics to Environmental and Engineering Problems, Colorado Springs, CO, February 22-26, 2004.
Werkema, D, E. Atekwana, E. A. Atekwana, J. W. Duris, S. Rossbach, J. Allen, L. Smart, AND W. Sauck. LABORATORY AND FIELD RESULTS LINKING HIGH CONDUCTIVITIES TO THE MICROBIAL DEGRADATION OF PETROLEUM HYDROCARBONS. Presented at 2004 Symposium on the Application of Geophysics to Environmental & Engineering Problems, Colorado, Springs, CO, February 22-26, 2004.
Werkema, D. NAVEL BASE VENTURA COUNTY, PORT HUENEME, CALIFORNIA EPA CHARACTERIZATION TEST CELL REPORT ON ELECTROMAGNETIC SURVEYS IN THE TEST CELL AREA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/S-04/073 (NTIS PB2004-106608), 2004.