DRI / DIRECTORY / RON HERSHEY
Ron Hershey Profile Photo
Dr. Ron Hershey
Associate Research Scientist, Hydrogeology

Professional Interests

Dr. Hershey has extensive experience in ground-water sampling, ground-water monitoring network design and evaluation, and the use of aqueous thermodynamic geochemical models including PHREEQE, WATEQ, and NETPATH. Other research interests include the use of environmental isotopes and aqueous geochemistry in hydrogeologic studies of local and regional scale. He has used isotopic ratios of carbon to trace the movement of water through the hydrologic cycle and to delineate recharge zones in mountainous carbonate terrain. Dr. Hershey is also interested in the transport of radionuclides and hazardous materials in ground water.

Research Areas

  • Hydrology of the Unsaturated Zone
  • Contaminant Transport
  • Hydrogeological Controls on Availability and Quality of Ground Water
  • Global Environmental Hydrology
  • Integrated Watershed System

Education

Degree Institution Area
Ph.D. University of Nevada, Reno Hydrogeology
M.S. University of Nevada, Las Vegas Hydrogeology
B.S. University of New Mexico, Albuquerque Geology
B.A. Drake University, Des Moines Journalism

Keywords

hydrogeology, geochemistry, isotopes, isotope hydrology, carbon-14, groundwater age, water-rock reaction, pit lake

 

Publications
2022
Visser, A., Kwicklis, E., Farnham, I., Tompson, A. F., Hershey, R. L. (2022). Using groundwater noble gas measurements to confirm paleorecharge hypotheses at Pahute Mesa, Nevada National Security Site, Nevada, USA, Hydrogeology Journal, Springer, https://doi.org/10.1007/s10040-021-02428-7

2021
Thomas, J. M., Hershey, R. L., Fereday, W. H., Burr, G. (2021). Using carbon-14 of dissolved organic carbon to determine groundwater age and travel times I aquifers with low organic carbon., Applied Geochemistry, 124, Elsevier

Kwicklis, E., Farnham, I., Hershey, R. L., Visser, A., Hoaglund III, J. (2021). Understanding long-term groundwater flow at Pahute Mesa and vicinity, Nevada National Security Site, USA, from naturally occurring geochemical and isotopic tracers., Hydrogeology Journal, 29, 2725-2749, Springer, https://doi.org/10.1007/s10040-021-02397-x

Russell, C. E., Collins, C. M., French, R. H., Hershey, R. L., Rivera, P. (2021). Compilation and Evaluation of Data from Groundwater Impounded within the U12n and U12t Tunnels, Rainier and Aqueduct Mesas, Nevada National Security Site, DRI: Las Vegas, https://doi.org/10.2172/1836541

Dechdacho, P., Hershey, R. L., Perez, L. J., Parashar, R. (2021). The Influence of Compost on Arsenic Removal from Contaminated Groundwater in Granitic Aquifers, Journal of Nevada Water Resources Assoication (Winter 2021), 42-54, Nevada Water Resources Association, 10.22542/jnwra/2021/1/2
https://www.nvwra.org/journal

2020
Hershey, R. L., Parashar, R., Cooper, C. A., Heintz, K. M., Pham, H. V., Lyles, B. F. (2020). Evaluation of Timber Mountain Recharge and Groundwater Flow in Relation to Pahute Mesa-Oasis Valley Flow System, Desert Research Institute, DOE/NV/0003590-56, https://doi.org/10.2172/1727435

Farnham, I. M., Kwicklis, E. M., Hershey, R. L., Visser, A., Hoaglund, J. (2020). Phase II Geochemical and Isotopic Evaluation of Groundwater Flow in the Pahute Mesa-Oasis Valley Flow System, Nevada., Revision No. 1, Navarro, N/0002653–069

Perez, L. J., Hershey, R. L., Parashar, R. (2020). Geochemical evolution of the groundwater at the Reno-Stead Water Reclamation Facility., Truckee Meadows Water Authority Report

2018
Hershey, R. L. (2018). Assessment of Tritium Activities in Bailed versus Pumped Samples from Wells at the Nevada National Security Site, Desert Research Institute, 45285

Heintz, K. M., Healey, J. M., Hershey, R. L., Pohlmann, K. F. (2018). Letter Report: Well Evaluation of UE-12t-6: Desert Research Institute

2017
Thomas, J. M., Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H. (2017). Hydraulic fracturing in the upper Humboldt River basin, Nevada, USA. 15th Water-Rock Interaction International Symposium, WRI-15, Procedia Earth and Planetary Science, 17, 189-192, 10.1016/j.proeps.2016.12.065

Pohlmann, K. F., Healey, J. M., Lyles, B. F., Cooper, C. A., Hershey, R. L. (2017). Hydrophysical Evaluation of Wells TW-B, TW-7, UE-6d, U-2gg PSE 3A, U-10L 1, and UE-6e in Yucca Flat (45274, DOE/NV/0000939-40), Desert Research Institute Publication No. 45274

2016
Eissa, M. A., Thomas, J. M., Pohll, G. M., Shouakar-Stash, O., Hershey, R. L., Dawoud, M. (2016). Groundwater recharge and salinization in the arid coastal plain aquifer of the Wadi Watir Delta, Sinai, Egypt, Applied Geochemistry, 71, 48-62, Elsevier, 10.1016/j.apgeochem.2016.05.017

Hershey, R. L., Fereday, W. H., Thomas, J. M. (2016). Dissolved Organic Carbon 14C in Southern Nevada Groundwater and Implications for Groundwater Travel Times (45268), Desert Research Institute Publication No. 45268

McGraw, D. S., Hershey, R. L. (2016). Application of Monte Carlo Methods to Perform Uncertainty and Sensitivity Analysis on Inverse Water-Rock Reactions with NETPATH (45267), Desert Research Institute Publication No. 45267

Hershey, R. L., Fereday, W. H. (2016). Laboratory Experiments to Evaluate Matrix Diffusion of Dissolved Organic Carbon Carbon-14 in southern Nevada Fractured-rock Aquifers (45266), Desert Research Institute Publication No. 45266

2015
Chapman, J. B., Cooper, C. A., Lyles, B. F., Hershey, R. L., Healey, J. M. (2015). Handbook: Collecting Groundwater Samples from Monitoring wells in Frenchman Flat, CAU 98, DOE/NV/0000939-23, Desert Research Institute Publication No. 45261

Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R. W., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, D. M., Thomas, J. M., Albright, W. H. (2015). Interim Final Report, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Desert Research Institute Publication No. 41263

2014
Eissa, M. A., Thomas, J. M., Hershey, R. L., Dawoud, M. I., Pohll, G. M., Dahab, K. A., Gomaa, M. A., Shabana, A. R. (2014). Geochemical and isotopic evolution of groundwater in the Wadi Watir Watershed, Sinai Peninsula, Egypt, Environmental Earth Sciences, 71 (4), 1855-1869, Springer-Verlag: New York, 10.1007/s12665-013-2588-4

Hershey, R. L., Rybarski, S. C., Thomas, J. M., Pohll, G. M. (2014). Water-Quality Data, Hydraulic Fracturing in the Upper Humboldt River Basin, Aquifer Quality Assessment Program, Report 2, Desert Research Institute Publication No. 41259

2013
Eissa, M. A., Thomas, J. M., Pohll, G. M., Hershey, R. L., Dahab, K., Dawoud, M., Gomaa, M., El Shiekh, A. (2013). Groundwater resource sustainability in the Wadi Watir Delta, Gulf of Aqaba, Hydrogeology Journal, 21 (8), 1833-1851, Springer Berlin Heidelberg: Berlin Heidelberg, 10.1007/s10040-013-1031-y
http://link.springer.com/content/esm/art:10.1007/s10040-013-1031-y/file/MediaObjects/10040_2013_1031_MOESM1_ESM.pdf

Cooper, C. A., Hershey, R. L., Healey, J. M., Lyles, B. F. (2013). Estimation of groundwater recharge at Pahute Mesa using the chloride mass-balance method, Desert Research Institute, Desert Research Institute Publication No. 45251

Hershey, R. L., Cablk, M. E., LeFebre, K., Fenstermaker, L.F., Decker, D. L. (2013). Water-Chemistry Evolution and Modeling of Radionuclide Sorption and Cation Exchange during Inundation of Frenchman Flat Playa, Desert Research Institute: Reno, NV, DOE/NA0000939-10; Desert Research Institute Publication No. 45252

Thomas, J. M., Moser, D. P., Fisher, J., Reihle, J. L., Wheatley, A. E., Hershey, R. L., Baldino, C., Weissenfluh, D. (2013). Using water chemistry, isotopes and microbiology to evaluate groundwater sources, flow paths and geochemical reactions in the death valley flow system, USA, Procedia Earth and Planetary Science, 7, 842-845

2012
Jasoni, R. L., Larsen, J. D., Lyles, B. F., Healey, J. M., Cooper, C. A., Hershey, R. L. (2012). Data Report: Meteorological and Evapotranspiration Data from Sagebrush and Pinyon Pine/Juniper Communities at Pahute Mesa, Nevada National Security Site, 2011-2012 (45248), Desert Research Institute Publication No. 45248

2010
Hershey, R. L., Mizell, S. A., Earman, S. B. (2010). Chemical and physical characteristics of springs discharging from reigonal flow systems of the carbonate-rock province of the Great Basin, western United States, Hydrogeology Journal, 18, 1007-1026, 10.1007/s10040-009-0571-7

Michalski, G. S., Earman, S. B., Dahman, C., Hershey, R. L., Mihevc, T. M. (2010). Multiple isotope forensics of nitrate in a wild horse poisoning incident, Forensic Science International, 198, 103-109

2009
Carroll, R. W., Hershey, R. L., Pohll, G. M. (2009). An unconfined groundwater model of the Death Valley Regional flow system and a comparison to its confined predecessor, Journal of Hydrology, 373, 316-328

Stone, M. C., Heyvaert, A. C., Chandler, C., Fritsen, C. H., Hershey, R. L., Moser, D. P., Bruckner, J., Lutz, A. D., Memmott, J. C., Acharya, K. (2009). Ecological model for Walker Lake, Nevada.Ecological model for Walker Lake, Nevada., In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin

Hershey, R. L., Lyles, B. F., Mihevc, T. M., Sharpe, S. E. (2009). Major-ion and trace-element chemistry of Walker River and Walker Lake, Nevada.Major-ion and trace-element chemistry of Walker River and Walker Lake, Nevada., In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin

Heyvaert, A. C., Chandra, S., Fritsen, C. H., Hershey, R. L., Moser, D. P., Stone, M. C., Bruckner, J., Lutz, A. D., Memmot, J., Umek, J., Thomas, J. M. (2009). Contemporary Limnology of Walker Lake, NevadaContemporary Limnology of Walker Lake, Nevada, In Restoration of a Desert Lake in an Agriculturally Dominated Watershed: The Walker Lake Basin

2008
Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2008). A comparison of groundwater fluxes computed with MODFLOW and a mixing model using deuterium: application to the eastern Nevada Test Site and vicinity, Journal of Hydrology, 361, 371-385, 10.1016/j.jhydrol.2008.08.005

Earman, S. B., Hershey, R. L., Michalski, G., Dahman, C., Mihevc, T. M. (2008). Evaluation of chemical data from samples collected February 2008 at the Cactus Flat Main Lake depression and surrounding area, Nevada Test and Training Range, Desert Research Institute Publication No. 41244, Revision 1.0.

Hershey, R. L., Paces, J. B., Singleton, M. J., Kwicklis, E. M., Decker, D. L., Fryer, W. M., Earman, S. B. (2008). Geochemical and isotopic evaluation of groundwater movement in Corrective Action Unit 99: Rainier Mesa and Shoshone Mountain, Nevada Test Site, Desert Research Institute Publication No. 45229

Mizell, S. A., Mihevc, T. M., Hershey, R. L. (2008). Field Reconnaissance and Chemistry Data for Selected Water Sources on the Nevada Test and Training Range, Desert Research Institute Publication No. 41247

2007
Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2007). Global optimization of a deuterium calibrated, discrete-state compartment model (DSCM): Application to the eastern Nevada Test Site, Journal of Hydrology, 345, 237-253

Hershey, R. L., Heilweil, P., Gardner, P., Lyles, B. F., Earman, S. B., Thomas, J. M., Lundmar, K. W. (2007). Ground-water chemistry interpretations supporting the Basin and Range regional carbonate-rock aquifer system (BARCAS) study, eastern Nevada and western Utah

Knochenmus, L. A., Laczniak, R. J., Moreo, M. T., Sweetkind, D. S., Wilson, J. W., Thomas, J. M., Justet, L., Hershey, R. L., Earman, S. B., Lyles, B. F., Lundmark, K. (2007). Ground-water conditions, in Welch, A. H., Bright, D. J., and Knochenmus, L. A., eds., Water resources of the Basin and Range carbonate-rock aquifer system, White Pine County, Nevada, and adjacent areas in Nevada and Utah, U. S. Geological Survey Scientific Investigations Report 2007-5261, 37-42

Carroll, R. W., Hershey, R. L., Pohll, G. M. (2007). Groundwater Model of the Death Valley Regional Flow System Using MODFLOW-SURFACT

Laczniak, R. J., Flint, A. L., Moreo, M. T., Knochenmus, L. A., Lundmark, K., Pohll, G. M., Carroll, R. W., Smith, J. L., Welborn, T. L., Heilweil, V. M., Pavelko, M. T., Hershey, R. L., Thomas, J. M., Earman, S. B., Lyles, B. F. (2007). Ground-water budgets, in Welch, A. H., Bright, D. J., and Knochenmus, L. A., eds., Water resources of the Basin and Range carbonate-rock aquifer system, White Pine County, Nevada, and adjacent areas in Nevada and Utah, U. S. Geological Survey Scientific Investigations Report 2007-5261, 43-68

Thomas, J. M., Decker, D. L., Patterson, G. L., Peterman, Z. E., Mihevc, T. M., Larsen, J. D., Hershey, R. L. (2007). Yucca Mountain area saturated zone dissolved organic carbon isotopic data, Yucca Mountain Nevada System of Higher Education Final Report

2006
Gilliam, A. B., Carroll, R. W., Pohll, G. M., Hershey, R. L. (2006). Numerical simulation of groundwater withdrawal within the Mercury Valley administrative groundwater basin, Nevada

Carroll, R. W., Hershey, R. L., Pohll, G. M. (2006). Numerical simulation of groundwater withdrawal from proposed pumping near the southeastern Nevada Test Site

2005
Hershey, R. L., Thomas, J. M., Rose, T. P., Paces, J. B., Farnham, I. M., Benedict, J. ,. (2005). Evaluation of groundwater movement in the Frenchman Flat CAU using geochemical and isotopic analysis

2004
Earman, S. B., Hershey, R. L. (2004). Water quality impacts from waste rock at a Carlin-type gold mine, Elko County, Nevada, Environmental Geology, 45, 8, 1043-1053

1995
Hershey, R. L., Mizell, S. A. (1995). Water Chemistry of Spring Discharge from the Carbonate-Rock Province of Nevada, and Death Valley, California. Project Report to the Las Vegas Valley Water District, 45, DRI Report No. 41140

Conference Proceedings
2021
Dechdacho, P., Hershey, R. L., Perez, L. J., Parashar, R. (2021). The influence of compost on arsenic removal from contaminated groundwater in granitic aquifers, UCOWR/NIWR Annual Water Resources Conference, June 8, 2021-June 11, 2021

Dechdacho, P., Perez, L. J., Hershey, R. L., Parashar, R. (2021). The Influence of an Iron Metal-Organic Framework Material on Arsenic Sorption in Groundwater: Column Experiments and Simulations, AGU Fall Meeting: New Orleans, LA, December 13, 2021-December 17, 2021, H45Q-1376

Lutz, A., Olsen, C., Tate, A., Hershey, R. L., McCrea, K. (2021). Identifying Mineral Precipitate Formation in Nevada Pit Lakes, Nevada Water Resources Association: Sparks, Nevada, October 13, 2021-October 14, 2021

2019
Hershey, R. L., Parashar, R., Pham, H. V., Lyles, B. F., Cooper, C. A., Heintz, K. M. (2019). Evaluation of Timber Mountain Recharge and Groundwater Flow in Relation to Pahute Mesa Groundwater Flow, Department of Energy, Underground Test Area Activity, Technical Information Exchange, August 29, 2019

Thomas, J. M., Hershey, R. L., Farnham, I. (2019). Using Dissolved Organic Carbon 14C to Calculate Groundwater Travel Times in Southern Nevada, Devils Hole Workshop 2019: Death Valley, California, May 1, 2019-May 3, 2019

Farnham, I. M., Hershey, R. L., Visser, A., Kwicklis, E. (2019). Phase II Geochemical and Isotopic Evaluation of Groundwater Flow in the Pahute Mesa-Oasis Valley Flow System, Department of Energy, Underground Test Area Activity, Technical Information Exchange: Las Vegas, August 29, 2019

2017
Kruger, B. R., Moser, D. P., Hershey, R. L. (2017). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon.: Beatty, NV

Kruger, B. R., Moser, D. P., Hershey, R. L. (2017). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon, Devils Hole Workshop: Beatty, NV, May 2017.

2016
Thomas, J. M., Hershey, R. L., Fereday, W. H. (2016). Using Dissolved Organic Carbon Isotopes for Groundwater Age Dating in Southern Nevada, USA, European Geosciences Union Annual Meeting: Vienna, Austria, April 17, 2016-April 22, 2016, EGU2016-5176

Pohll, G. M., Chapman, J. B., Pohlmann, K. F., Plume, R., Parashar, R., Rybarski, S. C., Hershey, R. L., Fereday, W. H., Reeves, M., Thomas, J. M. (2016). Assessment of the Migration Potential of Hydraulic Fracturing Fluids in Northeastern Nevada, American Water Resources Association: Anchorage, AK, April 25, 2016-April 27, 2016

Moser, D. P., Willever, K. L., Fisher, J. C., Sackett, J. D., Kruger, B. R., Bruckner, J., Hershey, R. L., Fritsen, C. H., Memmott, J. C., Bloomquist, D. (2016). Linkages between limnology, biogeochemistry, and microbial communities of a threatened terminal lake ecosystem: Walker Lake, Nevada, USA, Terminus Lakes Workshop. University of Nevada Reno: Reno, NV, August 2016.

Kruger, B. R., Werne, J. P., Branstator, D. K., Hrabik, T. R., Chikaraishi, Y., Ohkouchi, N., Hershey, R. L., Moser, D. P., Minor, E. C. (2016). Applying natural abundance radiocarbon analysis to understand ecosystem dynamics in surface and groundwater: Insights and precautions, American Society for Limnology and Oceanography (ASLO) Annual Meeting: Salt Lake City, UT, April 2016

2015
Kruger, B. R., Moser, D. P., Hershey, R. L. (2015). Constraining the age of water in Southern Nevada aquifers: Investigating microbial controls on radiocarbon signatures of dissolved organic carbon, Devils Hole Workshop: Ash Meadows National Wildlife Refuge, NV, May 7, 2015

2013
Thomas, J. M., Moser, D. P., Fisher, J., Reihle, J. L., Wheatley, A. E., Hershey, R. L., Baldino, C., Weissenfluh, D. (2013). Using Water Chemistry, Isotopes and Microbiology to Evaluate Groundwater Sources, Flow Paths and Geochemical Reactions in the Death Valley Flow System, USA, WRI Conference: Grenoble, France, Invited talk

2012
Eissa, M. A., Thomas, J. M., Pohll, G. M., Houakar-Stash, O., Hershey, R. L., Dawoud, M. I., Dahab, K., Gomaa, M. A. (2012). Modeling groundwater recharge and seawater intrusion in the Quaternary coastal plain aquifer of the Wadi Watir Delta, Sinai, Egypt, The 22nd Annual Goldschmidt Conference: Montreal, June 24, 2012-June 29, 2012, Abstract 220cd, 590

2011
LeFebre, K., Hershey, R. L., Decker, D. L. (2011). Evaluation of Radionuclide Mobilization and Redistribution during Playa Lake Formation on the Frenchman Flat Playa, Nevada Nuclear Security Site, 2011 Fall Meeting American Geophysical Union: San Francisco, CA, December 5, 2011-December 9, 2011, Abstract H41H-1162

2010
Eissa, M. A., Thomas, J. M., Dawoud, M. I., Pohll, G. M., Gomaa, M. A., Dahab, K. A., Hershey, R. L. (2010). Groundwater resource sustainability in Wadi Watir, Gulf of Aqaba, Sinai, Egypt, 10th International Conference on Development of Drylands, Cairo, Egypt, December 12-15, 2010

2009
Fisher, J., Bruckner, J., PlanerFriedrich, B., Hershey, R. L., Moser, D. P. (2009). Arsenic biogeochemistry of Walker Lake NV, Terminus Lakes Workshop: Reno, NV

Bruckner, J., Fisher, J., Fritsen, C. H., Memmott, J. C., Hershey, R. L., Heyvaert, A. C., Moser, D. P. (2009). Microbial communities of Walker Lake, NV: Bacterial diversity of an alkaline, moderately saline terminal lake, American Society for Microbiology: Philadelphia, PA

Kwicklis, E. M., Rose, T. P., Farnham, I. M., Hershey, R. L., Paces, J. B. (2009). Evaluation of groundwater mixing, flow paths and travel times at the Nevada Test Site using geochemical and isotopic tracers, Geological Society of America

Fisher, J., Bruckner, J., Planer-Friedrich, B., Hershey, R. L., Moser, D. P. (2009). Arsenic biogeochemistry of Walker Lake, NV, Terminus Lakes Workshop: Reno, NV

2008
Michalski, G., Dahman, C., Earman, S. B., Hershey, R. L. (2008). Mutiple isotope forensics on nitrate in the poisoning of wild horses in 2007, American Geophysical Union Fall Meeting

Bruckner, J., Fritsen, C. H., Memmott, J. C., Hershey, R. L., Heyvaert, A. C., Moser, D. P. (2008). Microbial communities of a saline, alkaline terminal lake (Walker Lake, NV), American Society for Microbiology Annual Meeting: Boston, MA, June 2008, Poster No. N-116.

2007
Hershey, R. L., Decker, D. L., Earman, S. B., Ryu, J., Reimus, P. W., Garcia, E. S. (2007). Laboratory experiments of carbon-14 uptake on calcite and dolomite, The 233rd American Chemical Society National Meeting: Chicago

Decker, D. L., Earman, S. B., Hershey, R. L., Ryu, J., Garcia, E. S., Reimus, P. W. (2007). Reactive transport of 14C through a carbonate aquifer: Implications for contaminant migration, Geological Society of America Annual Meeting: Denver

Garcia, E. S., Reimus, P. W., Hershey, R. L., Decker, D. L., Earman, S. B. (2007). Laboratory experiments of carbon-14 uptake and release from calcite, The 233rd American Chemical Society National Meeting: Chicago

Carroll, R. W., Pohll, G. M., Earman, S. B., Hershey, R. L. (2007). A comparison of groundwater fluxes computed with MODFLOW and a stable isotope mixing model: Application to the eastern Nevada Test Site and vicinity, H41E-0829, American Geophysical Union Fall Meeting: San Francisco

2005
Hershey, R. L., Decker, D. L. (2005). Coupling a discrete-state compartment model and a water-rock reaction model with application to a large-scale hydrologic system in southern Nevada: San Francisco, CA

Hershey, R. L., Earman, S. B. (2005). Estimating groundwater recharge via a deuterium-calibrated discrete-state compartment model, H31C-1320, American Geophysical Union Fall Meeting: San Francisco

2003
Hershey, R. L., Papelis, C., Decker, D. L., Miller, G. C. (2003). Laboratory experiments of As(V) and As(III) sorption onto pit-lake sediments from three different orebody types: Cairns, Queensland, Australia