The Reston Groundwater Dating Laboratory

Papers with reference to environmental tracers and ground water age from USGS ground water dating group.

USGS Publication Warehouse

Plummer, L.N., Busby, J.F., Lee, R.W., and Hanshaw, B.B., 1990, Geochemical modeling of the Madison aquifer in parts of Montana, Wyoming, and South Dakota: Water Resources Research, v. 26, no. 9, p. 1981-2014.

Busby, J.F., Plummer, L.N., Lee, R.W., and Hanshaw, B.B., 1991, Geochemical evolution of water in the Madison aquifer in parts of Montana, South Dakota, and Wyoming: U.S. Geological Survey Professional Paper 1273-F, 89p.

Busenberg, E., and Plummer, L.N., 1991, Chlorofluorocarbons (CCl3F and CCl2F2): Use as an age-dating tool and hydrologic tracer in shallow ground-water systems: in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program -- Proceedings of the technical meeting, Monterey, California, March 11-15, 1991: U.S. Geological Survey Water-Resources Investigations Report 91-4034, p. 542-547.

Plummer, L.N., Prestemon, E.C., and Parkhurst, D.L., 1991, An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH: U.S. Geological Survey Water-Resources Investigations Report 91-4078, 227p.

Busenberg, E., and Plummer, L.N., 1992, Use of chlorofluorocarbons (CCl3F and CCl2F2) as hydrologic tracers and age-dating tools: Example - The alluvium and terrace system of central Oklahoma.  Water Resources Research, v. 28, no. 9, p. 2257-2284.

Plummer, L.N., Michel, R.L., Thurman, E.M., and Glynn, P.D., 1993a, Environmental Tracers for age-dating young ground water, in Alley, W.M., ed., Regional Ground-water Quality, Chap. 11, Van Nostrand Reinhold, 255-294.

Plummer, L.N., and Busenberg, E., 1993, CFC's-- Tools for Age-Dating and Tracing Shallow Ground Water. U.S. Geological Survey Yearbook Fiscal Year 1992, p. 45-47.

Busenberg, E., Weeks, E.P., Plummer, L.N., and Bartholemay, R.C., 1993, Age dating ground water by use of chlorofluorocarbons (CCl3F and CCl2F2), and distribution of chlorofluorocarbons in the unsaturated zone, Snake River Plain aquifer, Idaho National Engineering Laboratory, Idaho.  U.S. Geological Survey Water-Resources Investigations 93-4054, 47p.

Dunkle, S.A., Plummer, L.N., Busenberg, E., Phillips, P.J., Denver, J.M., Hamilton, P.A., Michel, R.L., and Coplen, T.B., 1993, Chlorofluorocarbons (CCl3F and CCl2F2) as dating tools and hydrologic tracers in shallow ground water of the Delmarva Peninsula, Atlantic Coastal Plain, United States.  Water Resources Research, v. 29(12), p. 3837-3860.

Plummer, L.N., Dunkle, S.A., and Busenberg, Eurybiades, 1993, Data on chlorofluorocarbons (CCl3F and CCl2F2) as dating tools and hydrologic tracers in shallow ground water of the Delmarva Peninsula: U.S. Geological Survey, Open-File Report 93-484, 56p.

Plummer, L.N., 1993, Stable isotope enrichment in paleowaters of the southeast Atlantic Coastal Plain, United States.  Science, v. 262, p. 2016-2020.

Reilly, T.E., Plummer, L.N., Phillips, P.J., and Busenberg, E. 1994, Estimation and corroboration of shallow ground-water flow paths and travel times by environmental tracer and hydraulic analyses -- A case study near Locust Grove, Maryland.  Water Resources Research, v. 30, No. 2, p. 421-433.

Ekwurzel, B., Schlosser, P., Smethie, W. Jr., Plummer, L.N., Busenberg, E., Michel, R.L., Weppernig, R., and, Stute, M., 1994, Dating of shallow groundwater: Comparison of the transient tracers 3H/3He, chlorofluorocarbons and 85Kr.  Water Resources Research, v. 30, No. 6, p. 1693-1708.

McConnell, J.B., Busenberg, E., and Plummer, L.N., 1994, Water-Resources data for the Valdosta area, south-central Georgia, 1961-93: U.S. Geological Survey Open-File Report 94-350, 58p.

Plummer, L.N., Prestemon, E.C., and Parkhurst, D.L., 1994, An interactive code (NETPATH) for modeling NET geochemical reactions along a flow PATH--     Version 2.0: U.S. Geological Survey Water-Resources Investigations Report 94-4169, 130 p.

Aravena, R., Wassenaar, L.I., and Plummer, L.N., 1995, Estimating C-14 groundwater ages in a methanogenic aquifer: Water Resources Research, v. 31, p. 2307-2317.

Cook, P.G., Solomon, D.K., Plummer, L.N., Busenberg, E., and Schiff, S.L.,1995, Chlorofluorocarbons as tracers of groundwater transport processes in a shallow, silty sand aquifer:  Water Resources Research 31(3), p. 425-434.

Drenkard, S., Plummer, L.N., Busenberg, E., Schlosser, P., Stute, M., and Dorr, H., 1995, Applications of the transient tracers tritium/helium-3, and chlorofluorocarbons for tracing and age-dating young ground water:  Field examples from the USA and Germany:  in W.J. van den Brink, R. Bosman, and F. Arendt (eds.), Contaminated Soil '95, Kluwer Academic Publishers, The Netherlands, p. 195-196.

Katz, B.G., Lee, T.M., Plummer, L.N., and Busenberg, E., 1995a, Chemical Evolution of groundwater near a sinkhole lake, northern Florida. 1. Flow patterns, age of groundwater, and influence of lakewater leakage: Water Resources Research, 31(6), p. 1549-1564.

Katz, B.G., Plummer, L.N., Busenberg, E., Revesz, K., Jones, B.F., and Lee, T.M., 1995b, Chemical Evolution of groundwater near a sinkhole lake, northern Florida. 2. Chemical patterns, mass-transfer modeling, and rates of chemical reactions: Water Resources Research v., 31, no. 6, p. 1565-1584.

Busenberg, E., and Plummer, L. N., 1996, Concentrations of chlorofluorocarbons and other gases in ground waters at Mirror Lake, New Hampshire.  In Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program -- Proceedings of the technical meeting,Colorado Springs, Colorado, September 20-24, 1993:  U.S. Geological Survey Water-Resources Investigations Report 94-4015, p. 151-158.

Shapiro, A.M., Wood, W.W., Busenberg, E., Drenkard, S., Plummer, L.N., Torgersen, T., and Schlosser, P., 1996, Conceptual model for estimating regional fluid velocity in the bedrock of the Mirror Lake Area, Grafton County, New Hampshire.  in Mallard, G.E., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program -- Proceedings of the technical meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water-Resources Investigations Report 94-4015, p. 171-177.

Cook, P.G., Solomon, D.K., Sanford, W.E., Busenberg, E., Plummer, L.N., and     Poreda, R.J., 1996, Inferring shallow groundwater flow in saprolite and fractured rock using environmental tracers: Water Resources, Research, v. 32, no. 6, p. 1501-1509.

Plummer, L.N., and Busenberg, E., 1996, Chlorofluorocarbons (CFCs) as Tracers and Age-Dating Tools for Young Ground Water: Selected Field Examples, in Stevens, P.R. and Nichols, T.J., eds., Joint U.S. Geological Survey, U.S. Nuclear Regulatory Commission Workshop on "Research Related to Low-Level Radioactive Waste Disposal", May 4-6, 1993, Reston, VA: U.S. Geological Survey Report 95-4045, p. 65-71.

Szabo, Z., Rice, D.E., Plummer, L.N., Busenberg, E., Drenkard, S., and Schlosser, P., 1996, Age-dating of shallow groundwater with chlorofluorocarbons, tritium/helium 3, and flow path analysis, southern New Jersey coastal plain: Water Resources Research, v. 32, no. 4, p. 1023-1038.

Focazio, M.J., Plummer, L.N., Bohlke, J.K., Busenberg, E., Bachman, L.J., and Powers, D.S., 1998, Preliminary estimates of residence times and apparent ages of ground water in the Chesapeake Bay watershed and water-quality data from a survey of springs.  U.S. Geological Survey Water-Resources Investigations Report 97-4225, 75p.

Johnston, C.T., Cook, P.G., Frape, S.K., Plummer, L.N., Busenberg, E., and Blackport, R.J., 1998, Ground water age and nitrate distribution within a glacial aquifer beneath a thick unsaturated zone: Ground Water, v. 36, no. 1, p. 171-180.

Modica, E., Buxton, H.T., and Plummer, L.N., 1998, Evaluating the source and residence times of ground-water seepage to headwaters streams, New Jersey Coastal Plain.  Water Resources Res., v. 34(11), p. 2797-2810.

Plummer, L.N., McConnell, J.B., Busenberg, E., Drenkard, S., Schlosser, P., and Michel, R.L., 1998a, Flow of river water into a karstic limestone aquifer—1. Tracing the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia.  Applied Geochemistry, v. 13(8), p. 995-1015.

Plummer, L.N., Busenberg, E., Drenkard, S., Schlosser, P., McConnell, J.B., Michel, R.L., Ekwurzel, B., and Weppernig, R., 1998b, Flow of river water into a karstic limestone aquifer—2. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia.  Applied Geochemistry, v. 13(8), p. 1017-1043.

Schlosser, P., Shapiro, S.D., Stute, M., Aeschbach-Hertig, W., Plummer, N., and Busenberg, E., 1998, Tritium/3He measurements in young groundwater--     chronologies for environmental records:  In "Isotope Techniques in the Study of Environmental Changes", International Atomic Energy Agency, Vienna, Austria, p. 165-189.

Thorstenson, D.C., Weeks, E.P., Haas, H., Busenberg, E., Plummer, L.N., and Peters, C.A., 1998, Chemistry of unsaturated zone gases sampled in open boreholes at the crest of Yucca Mountain, Nevada: Data and basic concepts of chemical and physical processes in the mountain.  Water Resources Res., 34(6), 1507-1529.

Plummer, L.N. and Busenberg E., 1999, Chlorofluorocarbons.  In P. Cook and A. Herczeg (Eds.) “Environmental Tracers in Subsurface Hydrology”, Chapter 15.  Kluwer Academic Press, 441-478.

Busenberg, E., Plummer, L.N., Bartholomay, R.C., and Wayland, J.E., 1999, Chlorofluorocarbons, sulfur hexafluoride and dissolved permanent gases in ground water from selected sites at and near the Idaho National Engineering and Environmental Laboratory, Idaho, 1994 - 97.  U.S. Geological Survey Open-File Report 98-274, 72p.

Plummer, L.N., and Friedman, L.C., 1999, Tracing and dating young ground water.  U.S. Geological Survey, Fact Sheet-134-99, 4p.

Goode, D.J., Busenberg, E., Plummer, L.N., Shapiro, A.M., and Vroblesky, D.A., 1999, CFC’s in the unsaturated zone and in shallow ground water at Mirror Lake, New Hampshire.  In U.S. Geological Survey Toxic Substances Hydrology Program-- Proceedings of the Technical Meeting, Charleston, south Carolina.  March 8-12, 1999.  Eds. D.W. Morganwalp and H.T. Buxton.  U.S. Geological Survey Water-Resources Investigations Report 99-4018C, p. 809-820.

Plummer, L.N., Rupert, M.G., Busenberg, E., and Schlosser, P., 2000a, Age of irrigation water in ground water from the Eastern Snake River Plain aquifer, south-central Idaho. Ground Water, 38(2), 264-283.

Busenberg, E., Plummer, L.N., Doughten, M. W., Widman, P. K., and Bartholomay, R.C., 2000, Chemical and isotopic composition and gas concentrations of ground water and surface water from selected sites at and near the Idaho National Engineering and Environmental Laboratory, Idaho, 1994-97. U.S. Geological Survey Open-File Report 00-81, 55p.

Busenberg E., and Plummer, L.N., 2000, Dating young ground water with sulfur hexafluoride: Natural and anthropogenic sources of sulfur hexafluoride. Water Resources Research, v. 36(10), 3011-3030.

Talma, A.S., Weaver, John M.C., Plummer, L. Niel, and Busenberg, Eurybiades, 2000, CFC tracing of groundwater in fractured rock aided with 14C and 3H to identify water mixing.  In: Groundwater: Past Achievements and Future Challenges (O. Sililo, ed.), Balkema, Rotterdam, p. 635-640.

Plummer, L.N., Busenberg, E., Böhlke, J.K., Carmody, R.W., Casile, G.C., Coplen, T.B., Doughten, M.W., Hannon, J.E., Kirkland, W., Michel, R.L., Nelms, D.L., Norton, B.C., Plummer, K.E., Qi, H., Revesz, K., Schlosser, P., Spitzer, S., Wayland, J.E., and Widman, P.K., 2000, Chemical and isotopic composition of water from springs, wells, and streams in parts of Shenandoah National Park, Virginia, and vicinity, 1995 – 1999.  U.S. Geol.  Survey Water Resour. Invest. Rept. 00-373, 70p.

Plummer, L.N., Busenberg, E., Böhlke, J.K., Nelms, D.L., Michel, R.L., and Schlosser, P., 2001a, Groundwater residence times in Shenandoah National Park, Blue Ridge Mountains, Virginia, USA: A multi-tracer approach.  Chemical Geology, v. 179/1-4, p. 93-111.

Plummer, L. Niel, and Sprinkle, Craig L., 2001b, Radiocarbon dating of dissolved inorganic carbon in groundwater from confined parts of the Upper Floridan aquifer, Florida, USA. Hydrogeology Journal, v. 9, p. 127-150.

Busenberg, E., Plummer, L.N., and Bartholomay, R.C., 2001, Estimated age and source of the young fraction of ground water at the Idaho National Engineering and Environmental Laboratory.  U.S. Geological Survey Water-Resources Investigations Report 01-4265 (DOE/ID-22177), 144p.

Burton, William C., Plummer, L. Niel, Busenberg, Eurybiades, Lindsey, Bruce D., and Gburek, William R., 2002, Influence of fracture anisotropy on ground-water ages and chemistry, Valley and Ridge Province, Pennsylvania.  Ground Water v. 40, no. 3, p. 242-257.

Plummer, L. Niel, 2002, Environmental tracers and how they are used to understand the aquifer.  In Ground-Water Resources of the Middle Rio Grande Basin, New Mexico.  James R. Bartolino and James C. Cole, eds., U.S. Geological Survey Circular 1222, p. 82-83.

Plummer, L. Niel, Bexfield, Laura M., and Anderholm, Scott K., 2002, How ground-water chemistry helps us understand the aquifer.  In Ground-Water Resources of the Middle Rio Grande Basin, New Mexico.  James R. Bartolino and James C. Cole, eds., U.S. Geological Survey Circular 1222, p. 92-93.

Bexfield, L. M., and Plummer, L. N., 2003, Occurrence of arsenic in ground water of the Middle Rio Grande Basin, central New Mexico, in Welch, A. H., and Stollenwerk, K. G., eds., Arsenic in Ground Water: Geochemistry and Occurrence, Kluwer Academic Publishers, Chapter 11, p. 295-327.

Shapiro, Stephanie Dunkle, Plummer, L. Niel, Focazio, Michael J., Busenberg, Eurybiades, Kirkland, Wandee, and Fernandez, Mario, Jr., 2003, Occurrence of volatile organic compounds in drinking water from the United States: Results from archived chromatograms and water samples, 1989-2000.  U.S, Geological Survey Water-Resources Investigations Report, WRIR 02-4173, 20 p.

Lindsey, B.D., Phillips, S.W., Donnelly, C.A., Speiran, G.K., Plummer, L.N., Bohlke, J.K., Focazio, M.J., Burton, W.C., and Busenberg, Eurybiades, 2003, Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed:  U.S. Geological Survey Water-Resources Investigations Report 03-4035, 201 p.

Plummer, L.N., Bohkle, J.K., and Busenberg, Eurybiades, 2003, Approaches for ground-water dating, in Lindsey, B.D., Phillips, S.W., Donnelly, C.A., Speiran, G.K., Plummer, L.N., Bohlke, J.K., Focazio, M.J., Burton, W.C., and Busenberg, Eurybiades, Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed:  U.S. Geological Survey Water-Resources Investigations Report 03-4035, p. 12-24.

Nelms, D.L., Harlow, G.E., Jr., Plummer, L.N., and Busenberg, Eurybiades, 2003, Aquifer susceptibility in Virginia, 1998-2000: U. S. Geological Survey Water-Resources Investigations Report 03-4278, 58p. http://water.usgs.gov/pubs/wri/wri034278

Burns, D.A., Plummer, L.N., McDonnell, J.J., Busenberg, E., Casile, G., Kendall, C., Hooper, R.P., Freer, J.E., Peters, N.E., Beven, K., and Schlosser, P., 2003, Geochemical evolution of riparian ground water in a forested Piedmont catchment.  Ground Water, v. 41, no. 7, p. 913-925. http://onlinelibrary.wiley.com/doi/10.1111/j.1745-6584.2003.tb02434.x/abstract

Shapiro, S.D., Busenberg, E., Plummer, L.N., and Focazio, M.J., 2004a, Data from archived chromatograms on halogenated volatile organic compounds in untreated ground water used for drinking water in the United States, 1997-2000.  U.S. Geological Survey, Open-File Report 03-352, 31pp. http://pubs.er.usgs.gov/publication/ofr03352

Shapiro, S.D., Busenberg, E., Focazio, M.J., and Plummer, L.N., 2004b, Historical trends in occurrence and atmospheric inputs of halogenated volatile organic compounds in untreated ground water used as a source of drinking water.  Science of the Total Environment, v. 321, 201-217. http://pubs.er.usgs.gov/publication/70027206

Plummer, L. Niel, Bexfield, Laura M., Anderholm, Scott K., Sanford, Ward E., and Busenberg, Eurybiades, 2004a, Geochemical characterization of ground-water flow in the Santa Fe Group aquifer system, Middle Rio Grande Basin, New Mexico.  U.S. Geological Survey Water-Resources Investigations Report 03-4131 395p. http://pubs.er.usgs.gov/publication/wri034131

Rupert, Michael G., and Plummer, L. Niel, 2004a, Ground-water flow direction, water quality, recharge sources, and age, Great Sand Dunes National Monument, south-central Colorado.  U.S. Geological Survey Scientific Investigations Report 2004-5027, 28p. http://pubs.er.usgs.gov/publication/sir20045027

Rupert, Michael G., and Plummer, L. Niel, 2004b, Ground-water age and flow at the Great Sand Dunes National Monument, south-central Colorado.  U.S. Geological Survey Fact Sheet 2004-3051, 2p. http://pubs.er.usgs.gov/publication/fs20043051

Plummer, L. N., Bexfield, L. M., Anderholm, S. K., Sanford, W. E., and Busenberg, E., 2004b, Hydrochemical tracers in the Middle Rio Grande Basin, USA:  1. Conceptualization of groundwater flow.  Hydrogeology Journal, v. http://pubs.er.usgs.gov/publication/70026858

Sanford, W. E., Plummer, L. N., McAda, D. P., Bexfield, L. M., and Anderholm, S. K., 2004a, Hydrochemical Tracers in the Middle Rio Grande Basin, USA:  2. Calibration of a Ground-water Flow Model.  Hydrogeology Journal, v. 12(4), p. 389-407. http://pubs.er.usgs.gov/publication/70026708

Plummer, L.N., W.E. Sanford, L.M. Bexfield, S.K. Anderholm, and E. Busenberg, 2004c, Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico, in Groundwater Recharge in a Desert Environment: The Southwestern United States, edited by J.F. Hogan, F.M. Phillips, and B.R. Scanlon, Water Science and Applications Series, vol. 9, American Geophysical Union, Washington, D.C., 185-216. http://onlinelibrary.wiley.com/doi/10.1002/9781118665664.ch11/summary

Engesgaard, P., Højberg, A.L., Hinsby, K., Jensen, K.H, Laier, T., Larsen, F., Busenberg, E., and Plummer, L.N., 2004, Transport and time lag of chlorofluorocarbon gases in the unsaturated zone, Rabis Creek, Denmark.  Vadose Zone Journal, v. 3, p. 1249-1261. http://pubs.er.usgs.gov/publication/70031444

Sanford, W.E., Plummer, L.N., McAda, D.P., Bexfield, L.M., and Anderholm, S.K., 2004b, Use of environmental tracers to estimate parameters for a predevelopment-ground-water-flow model of the Middle Rio Grande Basin, New Mexico: U. S. Geological Survey Water-Resources Investigations Report 03-4286, 102 p. http://pubs.er.usgs.gov/publication/wri034286

Plummer, L.N., 2004, Dating of young groundwater, Isotope Hydrology and Integrated Water Resources Management, IAEA-CSP-23, International Atomic Energy Agency, Vienna, p. 19-20. pdf document

Shapiro, S.D., Busenberg, E., and Plummer, L.N., 2004, The stability of chlorofluorocarbons (CFCs) in ground water samples archived in borosilicate ampoules.  U.S. Geological Survey Open-File Report 04-1392, 30p, http://pubs.usgs.gov/of/2004/1392/. http://pubs.er.usgs.gov/publication/ofr20041392

Plummer, L.N., 2005, Dating of young groundwater, In Isotopes in the Water Cycle: Past, Present and Future of a Developing Science, Pradeep K. Aggarwal, Joel R. Gat, and Klaus F.O. Froehlich (eds), Springer, Dordrecht, The Netherlands, p. 193-220. http://www.springer.com/environment/pollution+and+remediation/book/978-1-4020-3010-9

Glynn, Pierre D., and Plummer, L. Niel, 2005, Geochemistry and the understanding of ground-water systems.  Hydrogeology Journal, v. 13, p. 263-287. http://link.springer.com/article/10.1007%2Fs10040-004-0429-y

Plummer, L. Niel, Bohlke, John Karl, and Doughten, Michael W., 2006, Perchlorate in Pleistocene and Holocene groundwater in North-Central New Mexico.  Environ. Sci. & Technol., v. 40, No. 6, 1757-1763. http://pubs.er.usgs.gov/publication/70030679

International Atomic Energy Agency (IAEA), 2006, Use of Chlorofluorocarbons in Hydrology: A Guidebook , STI/PUB/1238, 277 p., 111 figures, ISBN 92-0-100805-8, http://www-pub.iaea.org/MTCD/publications/PDF/Pub1238_web.pdf

Koh, D.C., Plummer, L.N., Solomon, D.K., Busenberg, E., Kim, Y., and Chang, H.W., 2006, Application of environmental tracers to mixing, evolution, and nitrate contamination of ground water in Jeju Island, Korea , Journal of Hydrology, vol. 327, p. 258 – 275, doi:10.1016/j.jhydrol.2005.11.021. http://pubs.er.usgs.gov/publication/70028042

Koh, D.C., Plummer, L.N., Busenberg, E., Kim, Y. 2007, Evidence for terrigenic SF6 in groundwater from basaltic aquifers, Jeju Island, Korea: Implications for groundwater dating.  J Hydrol., v. 339, p. 93-104, doi:10.1016/j.jhydrol.2007.03.011. http://pubs.er.usgs.gov/publication/70029710

Imes, J.L., Plummer, L.N., Kleeschulte, M.J., and Schumacher, J.G., 2007, Recharge area, base-flow and quick-flow discharge rates and ages, and general water quality of Big Spring in Carter County, Missouri , U.S. Geological Survey Scientific Investigations Report SIR 2007-5049, 79 p. http://pubs.er.usgs.gov/publication/sir20075049

Rupert, M.G. and Plummer, L.N., 2007, Ground-water age and flow at the Great Sand Dunes National Monument, south-central Colorado in Machette, M.N., Coates, M-M., and Johnson, M.L., 2007, 2007 Rocky Mountain Section Friends of the Pleistocene Field Trip—Quaternary geology of the San Luis Basin of Colorado and New Mexico, September 7–9, 2007: U.S. Geological Survey Open-File Report 2007–1193, pages D-135 to D-137, available on-line at http://pubs.usgs.gov/of/2007/1193/.

Sebol, L.A., Robertson, W.D., Busenberg, E., Plummer, L.N., Ryan, M.C., and Schiff, S.L., 2007, Evidence for CFC degradation under pyrite oxidizing conditions.  Jour. Hydrol. V. 347, p. 1-12. http://pubs.er.usgs.gov/publication/70030117

Hinsby, K., Hojberg, A.L., Engesgaard, P., Jensen, K.H., Larsen, F., Plummer, L.N., and Busenberg, E., Transport and degradation of chlorofluorocarbons (CFCs) in a pyretic aquifer, Rabis Creek, Denmark.  Water Resources Research, v 43, W10423, doi:10.1029/2006WR005854. http://pubs.er.usgs.gov/publication/70031444

Busenberg, E., and Plummer, L.N., 2008, Dating groundwater with trifluoromethyl sulfurpentafluoride (SF5CF3), sulfur hexafluoride (SF6), CF3Cl (CFC-13), and CF2Cl2 (CFC-12), Water Resour. Res., 44, W02431, doi:10.1029/2007WR006150. http://pubs.er.usgs.gov/publication/70033592

Plummer, L.N., Busenberg, E., Eberts, S.M., Bexfield, L.M., Brown, C.J., Fahlquist, L.S., Katz, B.G., and Landon, M.K., 2008, Low-level detections of halogenated volatile organic compounds in groundwater: Use in vulnerability assessments.  Jour. Hydrologic Engineering, v. 13(11), 1049-1068; DOI: 10.1061/(ASCE)1084-0699(2008)13:11(1049). http://pubs.er.usgs.gov/publication/70033411

Rupert, M.G., and Plummer, L.N., 2009, Groundwater quality, age, and probability of contamination, Eagle River watershed valley-fill aquifer, north-central Colorado, 2006–2007: U.S. Geological Survey Scientific Investigations Report 2009–5082, 59 p. http://pubs.usgs.gov/sir/2009/5082/

Mack, T.J., Akbari, M.A., Ashoor, M.H., Chornack, M.P., Coplen, T.B., Emerson, D.G., Hubbard, B.E., Litke, D.W., Michel, R.L., Plummer, L.N., Rezai, M.T., Senay, G.B., Verdin, J.P., and Verstraeten, I.M., 2010, Conceptual model of water resources in the Kabul Basin, Afghanistan: U.S. Geological Survey Scientific Investigations Report 2009–5262, 240 p., available online at http://pubs.usgs.gov/sir/2009/5262

Mack, T.J.; Chornack, M.P.; Coplen, T.B.; Plummer L.N.; Rezai, M.T.; Verstraeten, I.M., 2010, Availability of Water in the Kabul Basin, Afghanistan.  U.S. Geological Survey Fact Sheet, FS 2010-3037, 4p. http://pubs.usgs.gov/fs/2010/3037/pdf/fs2010-3037.pdf http://pubs.er.usgs.gov/publication/fs20103037

Solomon, D. K., Genereux, D.P., Plummer, L.N.,and Busenberg, E., 2010, Testing mixing models of old and young groundwater in a tropical lowland rain forest with environmental tracers.  Water Resour. Res., v. 46, W04518, doi:10.1029/2009WR008341. http://pubs.er.usgs.gov/publication/70044511

Heilweil, V.M., Gingerich, S.B., Plummer, L.N., and Verstraeten, I.M., 2010, Groundwater Resources of Mosteiros Basin, Island of Fogo, Cape Verde, West Africa.  U.S. Geological Survey, Fact Sheet 2010-3069, 3p. http://pubs.er.usgs.gov/publication/fs20103069

Heilweil, V.M., Gingerich, S.B., Plummer, L.N., and Verstraeten, I.M., 2010, Groundwater Resources of Ribeira Paúl Basin, Island of Santo Antão, Cape Verde, West Africa.  U.S. Geological Survey, Fact Sheet 2010-3070, 3p.

Heilweil, V.M., Gingerich, S.B., Plummer, L.N., and Verstraeten, I.M., 2010, Groundwater Resources of Ribeira Fajã Basin, Island of São Nicolau, Cape Verde, West Africa.  U.S. Geological Survey, Fact Sheet 2010-3071, 3p. http://pubs.er.usgs.gov/publication/fs20103071

Busenberg, E., and L. N. Plummer, 2010, A rapid method for the measurement of sulfur hexafluoride (SF6), trifluoromethyl sulfur pentafluoride (SF5CF3), and Halon 1211 (CF2ClBr) in hydrologic tracer studies. Geochem. Geophys. Geosyst., 11, Q11001, doi:10.1029/2010GC003312. http://pubs.er.usgs.gov/publication/70003475

Hinkle, S.R., Shapiro, S.D., Plummer, L.N., Busenberg, Eurybiades, Widman, P.K., Casile, G.C., and Wayland, J.E., 2011, Estimates of tracer-based piston-flow ages of groundwater from selected sites—National Water-Quality Assessment Program, 1992–2005: U.S. Geological Survey Scientific Investigations Report 2010-5229, 90 p. http://pubs.usgs.gov/sir/2010/5229/

El-Kadi, Aly I., Plummer, L. Niel, and Aggarwal, Pradeep, 2011, NETPATH-WIN: An Interactive User Version of the Mass-Balance Model, NETPATH. Ground Water. v. 49(4), 593-599.  Supporting Information:  http://onlinelibrary.wiley.com/store/10.1111/j.1745-6584.2010.00779.x/asset/supinfo/GWAT_779_sm_figs1-s24.pdf?v=1&s=f47150dd50c3b9296e3a903aeae5f5fd690c5d1f. http://pubs.er.usgs.gov/publication/70032674

McMahon, P.B., Plummer, L. N., Böhlke, J. K., Shapiro, S. D., and Hinkle, S. R., 2011, A comparison of recharge rates in aquifers of the United States based on groundwater-age data.   Hydrogeology Journal, v. 19(4), 779-800.  DOI: 10.1007/s10040-011-0722-5.  Online First™, 7 April 2011.  http://www.springerlink.com/content/45068634756128m7/fulltext.pdf.  Electronic Supplemental Material--http://www.springerlink.com/content/45068634756128m7/MediaObjects/10040_2011_722_MOESM1_ESM.pdf http://pubs.er.usgs.gov/publication/70034203

Plummer, L.N., Eggleston, J.R. Andreasen, D.C., Raffensperger, J.P., Hunt, A.G., and Casile, G.C., 2012, Old groundwater in parts of the upper Patapsco aquifer, Atlantic Coastal Plain, Maryland, USA: evidence from radiocarbon, chlorine-36 and helium-4.  Hydrogeology Journal, on-line publication, 7 June, 2012.  doi 10.1007/s10040-012-0871-1. http://pubs.er.usgs.gov/publication/70043333

Han, L.-F., Plummer, L.N., and Aggarwal, P., 2012, A graphical method to evaluate predominant geochemical processes occurring in groundwater systems for radiocarbon dating.  Chemical Geology 318-319, p. 88-112. On line 12 May, 2012.  doi: 10.1016/j.chemgeo.2012.05.004. http://pubs.er.usgs.gov/publication/70043331

Manning, A.H., Clark, J.F., Diaz, S.H., Rademacher, L.K., Earman, S., and Plummer, L.N., 2012, Evolution of groundwater age in a mountain watershed over a period of thirteen years.  J. Hydrology, v. 460-461, p. 13-28. http://dx.doi.org/10.1016/j.jhydrol.2012.06.030

Plummer, L.N., Sanford, W.E., and Glynn, P.D., 2013, Characterization and Conceptualization of Groundwater Flow System.  In IAEA, 2013, Isotope Methods for Dating Old Groundwater, International Atomic Energy Agency, Vienna, April, 2013, Chap. 2, p 5-19. STI/PUB/1587, ISBN 978–92–0–137210–9, 357p.  http://www-pub.iaea.org/books/IAEABooks/8880/Isotope-Methods-for-Dating-Old-Groundwater

Plummer, L.N., and Glynn, P.D., 2013, Radiocarbon Dating in Groundwater Systems.  In IAEA, 2013, Isotope Methods for Dating Old Groundwater, International Atomic Energy Agency, Vienna, April, 2013, Chap. 4, p 33-89. STI/PUB/1587, ISBN 978–92–0–137210–9, 357p. http://www-pub.iaea.org/books/IAEABooks/8880/Isotope-Methods-for-Dating-Old-Groundwater

Plummer, L.N., and Sanford, W.E., 2013, Case Study Middle Rio Grande Basin, New Mexico, USA.  In IAEA, 2013, Isotope Methods for Dating Old Groundwater, International Atomic Energy Agency, Vienna, April, 2013, Chap. 12, p. 273-295. STI/PUB/1587, ISBN 978–92–0–137210–9, 357p. http://www-pub.iaea.org/books/IAEABooks/8880/Isotope-Methods-for-Dating-Old-Groundwater

Torgersen, T., Purtschert, R., Phillips, F., Plummer, N., Sanford, W., and Suckow, A., 2013, Defining Groundwater Age.  In IAEA, 2013, Isotope Methods for Dating Old Groundwater, International Atomic Energy Agency, Vienna, April, 2013, Chap. 3,  p. 21-32. STI/PUB/1587, ISBN 978–92–0–137210–9, 357p. http://www-pub.iaea.org/books/IAEABooks/8880/Isotope-Methods-for-Dating-Old-Groundwater

Shapiro, S.D., Plummer, L.N., Busenberg, E., Widman, P.K., Casile, G.C., and Wayland, J.E., 2011, Estimates of tracer-based piston-flow ages of groundwater from selected sites: National Water-Quality Assessment Program, 2006-2010.  U.S. Geological Survey Scientific Investigations Report 2012-5141. http://pubs.er.usgs.gov/publication/sir20125141

Plummer, L. Niel, Sibrell, Philip L., Casile, Gerolamo C., Busenberg, Eurybiades, Hunt, Andrew G., and Schlosser, Peter, 2013, Tracing groundwater with low-level detections of halogenated VOCs in a fractured carbonate-rock aquifer, Leetown Science Center, West Virginia, USA.  Applied Geochemistry, v. 33 (2013), 260-280. http://pubs.er.usgs.gov/publication/70046560

Yager, Richard M., Plummer, L. Niel, Kauffman, Leon J., Doctor, Daniel H., Nelms, David L., and Schlosser, Peter, 2013, Comparison of age distributions estimated from environmental tracers by using binary-dilution and numerical models of fractured and folded karst: Shenandoah Valley of Virginia and West Virginia, USA.  Hydrogeology Journal, published online, 28 June, 2013. http://pubs.er.usgs.gov/publication/70047340

Busenberg, Eurybiades, and Plummer, L. Niel, 2013, A 17-year record of environmental tracers in spring discharge, Shenandoah National Park, Virginia, USA—Use of climatic data and environmental conditions to interpret discharges, dissolved solutes, and tracer concentrations.  Aquatic Geochemistry, 10.1007/s10498-013-9202-y. http://pubs.er.usgs.gov/publication/70100421

Labasque, T., Aquilina, L., Vergnaud, V., Hochreutener, R., Barbecot, F., Casile, G., 2013, Inter-comparison exercises on dissolved gases for ground water dating – Goals of the exercise and site choice, validation of the sampling strategy. Applied Geochemistry, v. 40 (2013), 119-125. http://www.sciencedirect.com/science/article/pii/S0883292713002825

Sanford, Ward, E., and Pope, Jason, P., Quantifying groundwater’s role in delaying improvements to Chesapeake Bay water quality. Environmental Science & Technology (2013), 47 (23), 13330-13338. http://pubs.er.usgs.gov/publication/70055514

Sanford, Ward, E., Doughten, Michael, W., Coplen, Tyler, B., Hunt, Andrew, G., Bullen, Thomas, D., Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater. Nature, (2013) v. 503, 252-256. http://pubs.er.usgs.gov/publication/70057876

Liang-Feng Han, L. Niel Plummer, Revision of Fontes & Garnier's model for the initial 14C content of dissolved inorganic carbon used in groundwater dating, Chemical Geology, Volume 351, 2 August 2013, Pages 105-114, ISSN 0009-2541, http://dx.doi.org/10.1016/j.chemgeo.2013.05.011. http://pubs.er.usgs.gov/publication/70046561