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Exposure Research

Records 1 to 55 of 55
2012
Sherrod, L., W. Sauck, AND D. D. WERKEMA. A Low-Cost, In Situ Resistivity and Temperature Monitoring System. GROUND WATER MONITORING AND REMEDIATION. National Ground Water Association, Westerville, OH, 0(0):1-27, (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).
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).
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.
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.
Werkema, D. ORAL PRESENTATION: INDIRECT MEASUREMENT OF BIOLOGICAL ACTIVITY TO MONITOR NATURAL ATTENUATION. Presented at Hazardous Substance Research Centers (HSRC) Workshop, Washington, DC, November 01 - 05, 2004.
Atekwana, E. A., R. Rowe, E. Atekwana, D Werkema, AND F. Legall. THE RELATIONSHIP OF TOTAL DISSOLVED SOLIDS MEASUREMENTS TO BULK ELECTRICAL CONDUCTIVITY IN AN AQUIFER CONTAMINATED WITH HYDROCARBON. JOURNAL OF APPLIED GEOPHYSICS. Elsevier Science BV, Amsterdam, Netherlands, 56:281-294, (2004).
2003
Sherrod, L., W. Sauck, D Werkema, AND E. Atekwana. COLUMN EXPERIMENTS AND ANOMALOUS CONDUCTIVITY IN HYDROCARBON-IMPACTED SOILS. Presented at Eighth International Congress of the Brazilian Geophysical Society, Rio de Janeiro, Brazil, September 14-18, 2003.
Werkema, D, E. Atekwana, E. A. Atekwana, S. Rossbach, AND W. Sauck. GEOELECTRICAL EVIDENCE OF MICROBIAL DEGRADATION OF DIESEL CONTAMINATED SEDIMENTS. Presented at Fall American Geophysical Union Meeting, San Francisco, CA, December 8-12, 2003.
Werkema, D, E. Atekwana, A. Endres, AND W. Sauck. GEOELECTRICAL STRATIGRAPHY AND ANALYSIS OF A HYDROCARBON IMPACTED AQUIFER. Presented at Joint Assembly of the European Geophysical Society, and the American Geophysical Union and European Union of Geosciences Spring 2003 meeting, Nice, France, April 4-13, 2003.
Werkema, D, E. Atekwana, A. Endres, W. Sauck, AND D. P. Cassidy. INVESTIGATING THE GEOELECTRICAL RESPONSE OF HYDROCARBON CONTAMINATION UNDERGOING BIODEGRADATION. GEOPHYSICAL RESEARCH LETTERS 30(12):49-1-49-4, (2003).
Werkema, D, E. Atekwana, E. A. Atekwana, S. Rossbach, AND W. Sauck. LABORATORY AND FIELD RESULTS LINKING HIGH CONDUCTIVITIES TO THE MICROBIAL DEGRADATION OF PETROLEUM HYDROCARBONS. Presented at Symposium on the Application of Geophysics to Environmental and Engineering Problems, Colorado Springs, CO, February 22-26, 2004.
Werkema, D, E. Atekwana, J. W. Duris, AND S. Rossbach. MICROBIAL COMMUNITY STRUCTURE IN A SHALLOW HYDROCARBON-CONTAMINATED AQUIFER ASSOCIATED WITH HIGH ELECTRICAL CONDUCTIVITY. Presented at Joint Assembly of the European Geophysical Society, and the American Geophysical Union and European Union of Geosciences Spring 2003 meeting, Nice, France, April 4-13, 2003.


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