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He has been active in the development and implementation of policy and guidance for the application of natural attenuation to the cleanup of contaminated soil and groundwater for many years, and he has been involved with evaluating natural attenuation at numerous sites, ranging from fuel hydrocarbon releases to landfills. Geological Survey Office of Groundwater, based in Reston, Virginia, where his primary responsibilities are to provide technical support for groundwater-management modeling and studies on groundwater/surface water interactions.

Barden was cochair of the ASTM task group responsible for developing an ASTM standard guide for remediation by natural attenuation. During the past 15 years he has participated in the development of USGS groundwater software such as GWM — a groundwater management process for MODFLOW — and the GSFLOW groundwater/surface water flow model.

He also was a member of a National Research Council committee on intrinsic remediation evaluating the scientific basis for natural attenuation as a remedy and he was also a member of the technical review group for the U. Army's development of a protocol for natural attenuation of explosives. Barlow also coordinates, and is an instructor for, two USGS courses on groundwater/surface water interactions. Barlow is a member of NGWA, and, along with Stanley A. in hydrology from the University of Arizona and a Ph.

In addition to teaching for NGWA, Barden is also an instructor for numerous training courses​. He has published numerous reports and papers in the hydrologic sciences during his 30-year career with the USGS, including a 2012 report with Stanley Leake on (U. Leake, was corecipient of the 2014 NGWA John Hem Award for Excellence in Science & Engineering. D in environmental engineering from the University of Connecticut.

Art Becker, MGWC, CPG, holds drilling licenses in 11 states.

He has a long history of environmental r​esearch related to energyproduction in the United States. Department of Energy, he was previously involved in many of the significant technical and regulatory environmental issues affecting industry during the last 20 years. His teaching involves isotope hydrology and geochemistry courses in the Department of Earth Sciences at the University of Waterloo and courses on isotope hydrology in Latin America, organized by the International Atomic Energy Agency. D., is an assistant professor of biostatistics at the University of North Texas Health Science Center at Fort Worth. Prior to Carnegie Mellon, Baird worked for several years in Washington, D. Ballard, PG, CHG, principal hydrogeologist at Taber Consultants, a groundwater resources, geotechnical, and environmental consulting firm with offices in West Sacramento, California, and Murfreesboro, Tennessee, is a registered professional geologist in California, Louisiana, and Tennessee, and a certified hydrogeologist in California. He's a member of the American Chemical Society, the American Geophysical Union, and NGWA.

He is chairman of the New Jersey State Well Drillers and Pump Installers Licensing and Examining Advisory Board.

Becker is a geology graduate of Rutgers, The State University of New Jersey-New Brunswick, a past president of NGWA and received the 2013 Robert Storm Award. Becker, PHg, LHg, PG, is the president of Robinson Noble Inc., a Tacoma, Washington, environmental and groundwater consulting firm founded in 1947.

He’s published more than 100 scientific publications and has received a number of awards, including the Meritorious Presidential Rank Award and NGWA’s John Hem Award for Excellence in Science & Engineering. Following his doctoral work at Ohio State University, he worked as a postdoctoral researcher for the U. Environmental Protection Agency in the Cincinnati, Ohio, division of the National Center for Environmental Assessment in the Office of Research and Development. Aravena consults as part of the expert pool of the International Atomic Energy Agency, Vienna, Austria, for their projects worldwide. Nina Baird is a faculty member at Carnegie Mellon University in Pittsburgh, Pennsylvania, doing research and teaching about effective buildings and their environmental impact. D., is a professor and former chair of the Chemistry Department at Western Michigan University.

Air Force Civil Engineer Center in San Antonio, Texas. He has been involved in numerous groundwater studies in Latin America, Canada, and the United States, related to evaluation of groundwater, resources and groundwater protection. He was formerly employed at Stone and Webster Engineering, where he performed hydrogeologic investigations at nuclear and coal-burning power plants, and characterized flow regimes at hazardous and proposed radioactive waste sites.

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