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Dr. McNab has 19 years of experience as an applied academic researcher as well as an environmental consultant. His research interests and experiences span a broad range of topics pertaining to the hydrology and geochemistry of contaminated soil and groundwater, with particular focus on the application of numerical process models to study variably saturated flow, multispecies transport, and geochemical reactions in heterogeneous environmental settings. Dr. McNab’s most recent research has involved employing reactive transport modeling tools to study arsenic mobility, subsurface CO2 storage, biotransformation of chlorinated solvents, and the geochemistry of animal waste impoundment lagoons. Prior project experience includes constructing groundwater flow models for application across a variety of scales, directing a metastudy of chlorinated solvent plumes associated with dozens of sites, and developing specialized groundwater treatment technologies.
McNab WW, Jr, Singleton MJ, Moran JE, Esser BK. Ion exchange and trace element surface complexation reactions associated with applied recharge of low-TDS water in the San Joaquin Valley, California. Appl Geochem 2009; 24(1):129–137.
McNab WW, Jr, Singleton MJ, Moran JE, Esser BK. Assessing the impact of animal waste lagoon seepage on the geochemistry of an underlying shallow aquifer. Environ Sci Technol 2007; 41(3):753–758.
Singleton MJ, Esser BK, Moran JE, Hudson GB, McNab WW, Harter T. Saturated zone denitrification: potential for natural attenuation of nitrate contamination in shallow groundwater under dairy operations. Environ Sci Technol 2007; 41(3):759–765.
Newell CJ, Cowie I, McGuire TM, McNab W. Multi-year temporal changes in chlorinated solvent concentrations at 23 MNA sites. J Environ Eng 2006; 132(6):653–663.
Beller HR, Madrid V, Hudson GB, McNab WW, Carlsen T. Biogeochemistry and natural attenuation of nitrate in groundwater at an explosives test facility. Appl Geochem 2004; 19(9):1483–1494.
McNab WW, Jr. Forensic analysis of chlorinated hydrocarbon plumes in groundwater: A multi-site perspective. Environ Forensics 2001; 2(4):313–320.
McNab WW, Jr. A Monte Carlo simulation method for assessing biotransformation effects on groundwater fuel hydrocarbon plume lengths. Comput Geosci 2001; 27(1):31–42.
McNab WW, Jr, Rice DW. Ascertaining the effect of reductive dehalogenation on chlorinated hydrocarbon plume lengths in groundwater: analyses of multi-site data. Soil Sediment Contam 2001; 10(1):1–19.
McNab WW, Jr, Ruiz R. In situ measurement of electro-osmotic fluxes and conductivity using single wellbore tracer tests. Ground Water Monit Rem 2001; 21(4):133–139.
McNab WW, Jr, Rice DW, Tuckfield C. Evaluating chlorinated hydrocarbon plume behavior using historical case population analyses. Biorem J 2000; 4(4):311–335.
McNab WW, Jr, Ruiz R, and M. Reinhard, In-situ destruction of chlorinated hydrocarbons in groundwater using catalytic reductive dehalogenation in a reactive well: Testing and operational experiences. Environ Sci Technol 2000; 34(1):149–153.
Cherepy N, McNab W, Wildenschild D, Ruiz R, Elsholz A. Electro-osmotic remediation of fine-grained sediments. Proceedings, Electrochemical Society, Environmental Aspects of Electrochemical Technology, 1999–39, 97–110, 1999.
McNab WW, Jr. Comparisons of geochemical signatures of biotransformation of fuel hydrocarbons in groundwater. Environ Monit Assess 1999; 59(3):257–274.
McNab WW, Jr, Dooher BP. Authors’ reply to discussion of “Uncertainty analyses of fuel hydrocarbon biodegradation signatures in ground water by probabilistic modeling.” Ground Water 1999; 37(2):167–168.
McNab WW, Jr, Dooher BP. A critique of a steady-state analytical method for estimating contaminant degradation rates. Ground Water 1998; 36(6):983–987.
McNab WW, Jr, Dooher BP. Uncertainty analyses of fuel hydrocarbon biodegradation signatures in ground water by probabilistic modeling. Ground Water 1998; 36(4):691–698.
McNab WW, Jr, Ruiz R. Palladium-catalyzed reductive dehalogenation of dissolved chlorinated aliphatics using electrolytically-generated hydrogen. Chemosphere 1998; 37(5):925–636.
McNab WW, Jr. Simulation of reactive geochemical transport in groundwater using a semi-analytical screening model. Comput Geosci 1997; 23(8):869–882.
McNab WW, Jr, Narasimhan TN. Reactive transport of petroleum hydrocarbon constituents in a shallow aquifer: Modeling geochemical interactions between organic and inorganic species. Water Resour Res 1995; 31(8):2027–2033.
McNab WW, Jr, Narasimhan TN. Degradation of chlorinated hydrocarbons and groundwater geochemistry: A field study. Environ Sci Technol 1994; 28(5):769–775.
McNab WW, Jr, Narasimhan TN. Modeling reactive transport of organic compounds in groundwater using a partial redox disequilibrium approach. Water Resour Res 1994; 30(9):2619–2635.
McNab WW, Jr, Narasimhan TN. A multiple species reactive transport model with sequential decay chain interactions in heterogeneous subsurface environments. Water Resour Res 1993; 29(8):2737–2746.
Selected Conference Presentations
McNab WW Jr, Morris J. Carroll S, Foxall W. LLNL in Salah Project Update. ISG JIP Rock Mechanics Workshop (hosted by British Petroleum), Sunbury, UK, October 2008.
McNab WW Jr. Constraining denitrification mechanisms in shallow groundwater at an instrumented dairy site using reactive transport modeling. Poster Presentation, Groundwater Resources Association, Nitrate in California’s Groundwater: Are We Making Progress?, Modesto, CA, April 2006.
McNab WW Jr, Ezzedine S, Detwiler R. Quantifying an intrinsic mass transfer rate for TCE dissolution via pore-scale experiments and simulations. Groundwater Resources Association, DNAPL Source Zone Characterization and Remediation Symposium, San Francisco, CA, December 2005.
McNab WW Jr, Singleton M, Esser B, Moran J, Beller H, Kane S, Letain T. Nitrate loading and groundwater chemistry at a dairy site in California’s Central Valley. SAFEWATER 2005, International Conference on Safe Water, San Diego, CA, October 2005.
McNab WW Jr. Groundwater environmental investigation activities at Lawrence Livermore National Laboratory. Establishing research and development priorities in the environmental sciences within Ukraine, Dnipropetrovsk, Ukraine, September 2005.
McNab WW Jr. Geochemical signatures of fertilizers and soil amendments in public water supply aquifers in California. Ground Water Resources Association Annual Meeting, Rohnert Park, CA, September 2004.
McNab WW Jr. Nitrate in California groundwater: Mass loading and reactive transport across different spatial scales. University of California, Davis, Department of Civil and Environmental Engineering Distinguished Speaker Seminar Series, Davis, CA, February 2004.
McNab WW Jr. Inverse modeling of VOC plumes. Groundwater Resources Association, Environ Forensics Workshop, Emeryville, CA, November 2002.
McNab WW Jr. Forensic analysis of chlorinated hydrocarbon plumes. Environmental Litigation, Advanced Forensics and Legal Strategies, University of Wisconsin, Madison, Department of Engineering Professional Development, San Francisco, CA, March 2001.
McNab WW Jr. Remediation of plume source areas at Lawrence Livermore National Laboratory by electroosmosis. U.S. Department of Energy 12th Technical Information Exchange Workshop, Augusta, GA, November 2000.
McNab WW Jr. Using multi-site groundwater quality data to support forensic analysis of chlorinated hydrocarbon plumes. Association of Engineering Geologists/Groundwater Resources Association Joint Annual Meeting, San Jose, CA, September 2000.
McNab WW Jr, Rice D, Dooher B, Layton D. Ethanol fate and transport. California CUPA/UST Conference 2000, San Francisco, CA, February 2000.
McNab WW Jr. Results of the chlorinated volatile organic compound historical case analysis and practical implications to site managers. AEHS/U.S. Navy Ninth Annual West Coast Conference on Contaminated Soils and Groundwater, Oxnard, CA, March 1999.
McNab WW Jr. Evaluating chlorinated hydrocarbon plumes using historical case analyses. National Ground Water Association Annual Meeting, Las Vegas, NV, December 1998.
McNab WW Jr. Evaluation of chlorinated hydrocarbon plume behavior in groundwater using historical case population analyses. Ground Water Resources Association Annual Meeting, Walnut Creek, CA, October 1998.
McNab WW Jr. Natural attenuation of fuel hydrocarbons: Lessons learned from the D.O.D. Demo Program. National Stakeholders Forum on Monitored Natural Attenuation, San Francisco, CA, August 1998.
McNab WW Jr. Evaluation of chlorinated VOC groundwater plume behavior using historical case analysis. 1st International Conference on Remediation of Chlorinated and Recalcitrant Compounds, Monterey, CA, May 1998.
McNab WW Jr. Uncertainty analyses of fuel hydrocarbon bioattenuation signatures in groundwater by probabilistic modeling. AEHS/U.S. Navy 7th Annual West Coast Conference on Contaminated Soils and Groundwater, Oxnard, CA, March 1997.
McNab WW Jr, Happel A, Krauter P, Reinhard M, Spormann A, Warikoo V. Fuel hydrocarbon biodegradation in ground water at elevated temperatures. Poster presentation, American Geophysical Union, Fall Meeting, San Francisco, CA, December 1995.
- American Geophysical Union
- National Ground Water Association
- Geological Society of America
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- Ph.D., Mineral Engineering, University of California, Berkeley, 1995
- M.S., Mineral Engineering, University of California, Berkeley, 1990
- A.B., Geology, University of California, Berkeley, 1988
- Member, Sigma Xi
- Professional Geologist, California, #7312
- U.S. Patent 6,431,281 B1: Catalytic Destruction of Groundwater Contaminants in Reactive Extraction Wells, issued August 13, 2002 (with Reinhard M).
- U.S. Patent No. 6,214,202 B1: In Situ Treatment of Contaminated Groundwater, issued April 10, 2001 (with Ruiz R, and Pico TM).
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