Ph.D., Hydrology, University of Arizona
M.S., Hydrology, Stanford University
B.S., Geological Science (with honors), Pennsylvania State University
Certified Professional Hydrogeologist No. 406, American Institute of Hydrology
Certified Hydrogeologist No. HG355, California
Professional Geologist No. 5937, California
Professional Geologist No. 28483, Arizona
Professional Geologist No. 936, Idaho
Professional Geoscientist No. 1767, Texas
Groundwater resource evaluations
Applications of numerical models
Fate and transport
Remediation system effectiveness analysis
Technical Review Boards
U.S. Department of Energy, Technology Innovation and Development, Office of Environmental Management, Advance Simulation Capability for Environmental Management, Peer Review Team Chair, 2011
Orange County Water District and the Orange County Sanitation District, Groundwater Replenishment System, Independent Advisory Panel, National Water Research Institute
Yucca Mountain Project, Department of Energy Expert Elicitation on Recharge
Westinghouse Hanford Company, Hanford, Washington: Peer Review Panelist, Site and Grout Performance Assessments
Los Alamos National Laboratory, Los Alamos, New Mexico: Blue Ribbon Panel, Review and Hydrogeologic Data Needs for the Environmental Restoration Program at LANL
Idaho National Engineering and Environmental Laboratory, Idaho Falls, Idaho: Executive Committee Chairman, National Roadmap for Vadose Zone Science and Technology
Ernest Orlando Lawrence Berkeley Laboratory, Oakland, California: Earth Sciences Division Annual Review
U.S. Environmental Protection Agency Technical Workshop on Case Studies to Assess Potential Impacts of Hydraulic Fracturing on Drinking Water Resources, Research Triangle Park, North Carolina, Invited Technical Expert, July 30, 2013
Board of Directors of the National Ground Water Association—2009 to 2015
Scientists and Engineers Division National Ground Water Association—Chair, 2006 to 2015
The University of Arizona, Hydrology and Water Resources Department Advisory Committee, Chairman
The University of Arizona, College of Science Dean's Board of Advisors
New Mexico Tech, Presidential Advisory Committee
Altela, Inc., Technical Advisory Board, Albuquerque, New Mexico
American Institute of Hydrology
American Society of Agronomy
American Geophysical Union
Arizona Hydrological Society
Crop Science Society of America
Geological Society of America
Ground Water Resources Association of California
International Association of Hydrogeologists
National Ground Water Association
New Mexico Geological Society
Soil Science Society of America
Vidler states that Dr. Stephens, "is a brain trust and makes the information relevant to the people he’s presenting to so it’s understandable. Extremely knowledgeable and capable.”
Daniel B. Stephens, Ph.D., P.Hg., P.G., is DBS&A’s founder and principal hydrologist. He has more than 35 years of experience in consulting, research, and academia, and is recognized internationally as an authority on vadose zone and groundwater hydrology.
Throughout his career, Dr. Stephens has been called upon to provide technical support in hydrogeology on projects of national significance. For example, he participated in a panel to review the groundwater flow and transport modeling studies for the Yucca Flat Corrective Action Unit for the Department of Energy, and was a member of a three-person blue-ribbon panel to review the hydrogeology of Los Alamos National Laboratory. He co-chaired the Executive Committee to map research needs in vadose zone hydrology for the Department of Energy. He also participated in an expert elicitation panel to quantify natural recharge at Yucca Mountain nuclear waste repository for the Department of Energy. As a litigation expert, he has provided testimony in more than 70 depositions and trials in the field of hydrology, involving characterization of the vadose zone and site hydrogeology, numerical modeling, environmental forensic investigations, and expert testimony for dozens of cases involving contamination of soil and groundwater, more than 30 of which involved allocation of remediation costs among PRPs.
During his academic career, Dr. Stephens was on the faculty of New Mexico Institute of Mining and Technology (NMT) for 10 years. He served as chairman of the Geoscience Department, and taught graduate level courses in subsurface hydrology, applied subsurface hydrology, field methods in hydrology, and vadose zone hydrology. He taught a pioneering course on vadose zone hydrology at NMT, covering the theory and application of vadose zone characterization and monitoring. His research in hydrogeology focused on quantification of recharge, stream-aquifer interaction, and applied numerical modeling of groundwater flow and solute transport.
Dr. Stephens published in 1995. The text illustrates the application of soil physics to practical problems relevant to the characterization and monitoring of the vadose zone and highlights new and emerging technologies for monitoring the vadose zone, particularly for the purpose of detecting contaminants.
Dr. Stephens has published papers in scientific journals extensively throughout his career and has been invited to speak on vadose zone issues to national symposia sponsored by diverse groups such as Law Seminars International; the Society of Petroleum Engineers, Environmental Study Group; the American Geophysical Union; the Soil Science Society of America; the National Groundwater Association; and the New Mexico Environment Department.
Dr. Stephens has worked with a wide variety of clients, including many attorneys, law firms, and mediators, Native American Tribes, state and federal agencies, cities, universities and public utilities, private citizen groups, and industry. For example, Merck and Company, et al., in the case titled Raul Valencia Abarca, et al., v. Merck & Co., Inc. et al., Dr. Stephens opined on the local hydrogeology and fate and transport of the metals of concern in soil, surface water, and groundwater. Dr. Stephens was quoted favorably in the Findings of Fact and Conclusions of Law in the landmark cases, collectively referred to as Burlington Northern, where the United States Supreme Court issued two key rulings on cleanup costs under CERCLA. Dr. Stephens’ broad mix of clients has afforded him the opportunity to investigate sites throughout the country, including California, Arizona, Texas, Oklahoma, Louisiana, Arkansas, Florida, Virginia, Michigan, Colorado, Wyoming, and many others.
During these investigations, Dr. Stephens has delt with multiple complex facilities, including mines and mills (copper, uranium, zinc, ARD), petroleum hydrocarbon releases at refineries and service stations (BTEX, MtBE), manufacturing operations (chlorinated solvents, 1,4 dioxane, chormium), wood treating facilities (pentachlorophenol, arsenic), hydraulic fracturing sites, deep well injection, salt water disposal, sea water intrusion, water balance studies, sources of rising groundwater among many others. The analyses have included site investigations and remedial action under CERCLA and RCRA.
Stephens, D.B. 2016. Challenging Times Ahead in Hydrology. Keynote speaker at the NGWA Conference on Hydrology and Water Quality in the Southwest. Albuquerque, New Mexico. February 23-24, 2016.
Stephens, D.B. 2015. Managed aquifer recharge. Presentation at the 2015 NGWA Groundwater Expo and Annual Meeting. Las Vegas, Nevada. December 15, 2015.
Stephens, D.B. and D.A. Stephens. 2015. The Role of William Smith’s Agricultural Improvements to Prisley Farm in the Development of the Geologic Map, Session on Celebrating the Genius of William ‘Strata’ Smith: Bicentennial Anniversary of Smith’s Revolutionary Map. Presentation at the Geological Society of America 2015 Annual Meeting, Baltimore, Maryland. November 1, 2015.
Stephens, D.B. 2015. Defining Basins from a Hydrologic Perspective: What are the Boundaries? Overview of the statutory structure including SGMA provisions; how the modeling works; areas of certainty and uncertainty; tips for selecting the most cost-effective approach. Invited speaker at the The Science and Law of Water in California Law Seminars International, Santa Monica, California. September 17, 2015.
Stephens, D.B. 2015. Analysis of Groundwater Monitoring Controversy at the Pavillion, Wyoming Natural Gas Field. Invited speaker at the 2015 Multi-State Salinity Coalition Annual Salinity Summit - Understanding the Opportunities and Challenges of Fracking in an Era of Water Supply Scarcity, Las Vegas, Nevada. February 19, 2015.
Stephens, D. B. 2014. Analysis of the Groundwater Monitoring Controversy at the Pavillion, Wyoming Natural Gas Field. Groundwater. doi: 10.1111/gwat.12272.
Stephens, D.B. 2014. Managed Aquifer Recharge: An Overview with Examples. Invited speaker for National Ground Water Association, Groundwater Expo and Annual Meeting, Las Vegas, Nevada. December 9-12, 2014.
Stephens, D.B. 2014. Analysis of a Groundwater Monitoring Investigation for Impacts of Hydraulic Fracturing, Pavillion, Wyoming. Webinar, National Ground Water Association. November 6, 2014.
Stephens, D.B. 2014. Analysis of Groundwater Monitoring Controversy at the Pavillion, Wyoming Natural Gas Field. Presentation at the 2014 Annual Meeting of the Geological Society of America. Vancouver, British Columbia, Canada. October 19, 2014.
Stephens, D.B. 2014. Analysis of Groundwater Monitoring Controversy at the Pavillion, Wyoming Natural Gas Field. Invited speaker for Society of Petroleum Engineers, Environmental Study Group. Midland, Texas. October 16, 2014.
Stephens, D.B. 2014. Analysis of Groundwater Monitoring Controversy at the Pavillion, Wyoming Natural Gas Field. Invited speaker at the Law Seminars International 2014 Hydraulic Fracturing in California. Beverly Hills, California. August 12, 2014.
Stephens, D.B., J. Cherney, J. Kay, T. Umstot, and B. Casadevall. 2014. High Recharge at a Semi-Arid Site Explains Wide-Spread Perchlorate in Groundwater with a Deep Water Table. Presentation at the National Ground Water Association Ground Water Summit. May 7, 2014. Denver, Colorado.
Stephens, D.B. 2013. Brownfield Remediation Program in the U.S. Invited speaker at the Institute of Soil Science of the Chinese Academy of Science. Nanjing, Peoples Republic of China. December 17, 2013.
Stephens, D.B., J. Cherney, J. Kay, T. Umstot, P. Kaiser, and B. Casadevall. 2013. Unexpectedly rapid migration of perchlorate through a thick vadose zone under low rainfall conditions. Invited speaker at the National Ground Water Association Pillars of Groundwater Innovation Conference. November 7-8, Phoenix, Arizona.
Stephens, D.B. 2013. Impacts of hydraulic fracturing on water resources, water supply and water quality. Invited speaker at the New Mexico Involvement Committee—Rocky Mountain Section of the American Water Works Association and the Rocky Mountain Section of the Water Environment Association. June 20, Albuquerque, New Mexico.
Stephens, D.B., M. Miller, S.J. Moore, T. Umstot, and D.J. Salvato. 2012. Decentralized Groundwater Recharge Systems Using Roofwater and Stormwater Runoff. Journal of the American Water Resources Association 48(1):134-144. February 2012.
Simco, A., D.B. Stephens, K. Calhoun, and D.A. Stephens. 2009. Historic Irrigation and Drainage at Priestley Farm by Joseph Elkington and William Smith. Vadose Zone Journal 9:4-13.
Stephens, D.B. 2012. Impacts of hydraulic fracturing on water resources. Invited speaker at the 19th Annual Conference, Western Water Law. November 15-16, Las Vegas, Nevada.
Stephens, D.B., F.E. Botros, S. Helenschmidt, P. Quinlan, and D.W. Davis. 2012. Rising groundwater: unexpected consequences downgradient of a freeway expansion. Presentation at the National Ground Water Association Ground Water Summit, May 6-10, Garden Grove, California.
Stephens, D.B. and J.A. Kelsey. 2012. Overview of artificial recharge by surface infiltration. Presentation at the National Ground Water Association Ground Water Summit, May 6-10, Garden Grove, California.
Stephens, D.B. 2012. Demystifying flow in the vadose zone. Presentation at the National Ground Water Association Ground Water Summit, May 6-10, Garden Grove, California.
Stephens, D.B., F.E. Botros, S. Helenschmidt, B. Casadevall, P. Quinlan, and D. Davis. 2012. The Importance of Hydrogeologic Characterization and Analysis to Avoid Off-site Impacts in Highway Construction. Presentation given by F.E. Botros at the American Society of Civil Engineers, Geo-Congress 2012, March 25-29, Oakland, California.
Stephens, D.B., M. Miller, S. Moore, T. Umstot, and D.J. Salvato. 2011. Decentralized groundwater recharge systems using roofwater and stormwater runoff. Presentation at the American Water Resources Association Annual Water Resources Conference. November 7-10, Albuquerque, New Mexico.
Wahi, A.K. and D.B. Stephens. 2011. Is TCE from Biodegradation of PCE or a Separate Release? An Application of Compound Specific Isotope Analysis and Other Methods. Presentation given by A.K. Wahi at the Environmental Forensics in an Era of Emerging Diagnostic Methods. Ground Water Resources of California, April 12, 2011, Irvine, California.
Stephens, D.B. and S.J. Moore. 2011. A Role for Dispersed Groundwater Recharge Systems to Balance Effects of Hydro modification. Presentation at the Managed Aquifer Recharge Symposium. National Water Research Institute. January 24-26, Orange County, California.
Stephens, D.B., S.J. Moore, M.Miller, T. Umstot, and D.J. Salvato. 2010. Decentralized Artificial Recharge. Invited presentation at the 55th Annual New Mexico Water Conference: Water Needs in the Next Decade—How will institutions evolve to meet our water needs in the next decade? New Mexico State University, Las Cruces, New Mexico. December 1-3.
Stephens, D.B. and S.J. Moore. 2010. Rainwater Harvesting to Augment Groundwater Supplies. Presentation at the North American Geology in the 21st Century: Today and Tomorrow. AIPG-AGWT-FAPG-ASFE 2010 Conference, September 11-15, 2010, Orlando, Florida.
Stephens, D.B., S.J. Moore, S.J. Cullen, A. Staden, and L. Jong. 2010. Augmenting groundwater supplies using rain water harvesting. Presentation at the National Ground Water Association Ground Water Summit and Ground Water Protection Council Meeting. April 11-15, 2010, Denver, Colorado.