National Research Program


Kinetics and Thermodynamics of Chemical Evolution in Ground-Water Systems

The responsible use of our Nation's ground-water resources requires an ability to predict changes in water quality as a result of human impacts. Prediction of chemical quality in the ground-water environment depends on a detailed understanding of both chemical and hydrologic processes. To determine the spatial and temporal variability of ground-water quality, it is necessary to identify reactions occurring in the system, to define their kinetic and thermodynamic properties, and to determine how the configuration of the hydrologic regime influences ground-water quality. The objectives of this project are to: (1) identify chemical reactions in ground-water systems using observed chemical and isotopic composition of dissolved solutes and minerals; (2) develop geochemical models to aid in interpretation of chemical and isotopic data from ground- water systems; (3) develop tools for age-dating groundwaters; (4) determine rates of chemical reactions in ground-water systems from field hydrochemical data and modeled water ages; (5) conduct laboratory experiment to obtain thermodynamic data for mineral- water systems for use in geochemical models; (6) obtain laboratory kinetic data on rates of mineral dissolution and precipitation for comparison with field rates; and (7) study the fundamental mechanisms of mineral dissolution and precipitation as they apply to pure phases and to solid-solution minerals. For information related to tools for age-dating ground-water, see the Reston Chlorofluorocarbon Laboratory

REPORTS PUBLISHED 2003-2012

El-Kadi, A.I., Plummer, L.N., and Aggarwal, P., 2011, NETPATH-WIN: An Interactive User Version of the Mass-Balance Model, NETPATH: Ground Water, v. 49, no. 4, p. 593-599.(on-line abstract or on-line journal article, 746 KB, compilation copyright, National Ground Water Association; No claim to original US government works.)

Glynn, P.D., 2011, Foreword, in Bundschuh J. and Zilberbrand M., eds., Geochemical Modeling of Groundwater, Vadose and Geothermal Systems: CRC Press, p. xix-xx. (on-line foreward in pdf format, 4331 KB)

Glynn, P.D., and Brown, J.G., 2011, Integrating field observations and inverse and forward modeling: application at a site with acidic, heavy-metal-contaminated groundwater, in Bundschuh J. and Zilberbrand M., eds., Geochemical Modeling of Groundwater, Vadose and Geothermal Systems: CRC Press, Chapter 8, p. 181-234. (on-line paper in pdf format, 4331 KB)

Glynn P.D., L. Jacobsen, G. Phelps, G. Bawden, V. Grauch, R. Orndorff, R. Winston, M. Fienen, V. Cross and J. Bratton, 2011, 3D/4D Modeling, Visualization and Information Frameworks: Current US Geological Survey Practice and Needs, p 33-38, in Russell, H.A.J., Berg, R.C., and Thorleifson, L.H. (compilers): Three-Dimensional Geological Mapping; Workshop Extended Abstracts, Minneapolis, Minnesota, October 8 2011, Geological Survey of Canada, Open File 6998, 80 p. doi:10.4095/289609 (on-line paper in pdf format, 193 KB

Haase, K.B., Jordan, C., Mentis, E., Cottrell, L., Mayne, H.R., Talbot, R., and Sive, B.C., 2011, Changes in monoterpene mixing ratios during summer storms in rural New Hampshire (USA: Atmospheric Chemistry and Physics Discussions, v. 11, no. 7, p. 20631-20665. (on-line abstract of journal article)

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. (on-line abstract or on-line report in pdf format, 6.5 MB)

Jacobsen, L.J., Glynn, P.D., Phelps, G.A., Orndorff, R.C., Bawden, G.W., and Grauch, V.J.S., 2011, U.S. Geological Survey: a synopsis of three-dimensional modeling, in Berg, R.C. , Mathers, S. J., Kessler, H., and D.A. Keefer, eds., Synopsis of Current Three-dimensional Modeling in Geological Survey Organizations: Illinois State Geological Survey Circular 578, chapt. 13, p. 69-79. (on-line chapter in pdf format, 1.8 MB)

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, no. 4, p. 779-800. DOI: 10.1007/s10040-011-0722-5. (on-line abstract or on-line journal article in pdf format, 2.4 MB, U.S. Government work, not copyright protected in the U.S.)

Busenberg, E., and Plummer, L.N., 2010, A rapid method for the measurement of sulfur hexafluoride (SF6), trifluoromethyl sulfur pentafluoride (SF5CF3), and Halon 1211 (CF2ClBr) in hydrologic tracer studies: Geochemistry Geophysics Geosystems, v. 11, Q11001, doi:10.1029/2010GC003312. (on-line abstract or on-line report in pdf format, 480 KB, published by the American Geophysical Union and the Geochemical Society, not subject to U.S. copyright.)

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. (on-line abstract or on-line report in pdf format, 1.1 MB - also available in Portuguese)

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. (on-line abstract or on-line report in pdf format, 1.1 MB - also available in Portuguese)

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. (on-line abstract or on-line report in pdf format, 1.1 MB - also available in Portuguese)

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. (on-line abstract and access to on-line report in pdf format)

Mack, T.J., Chornack, M.P., Coplen, T.B., Plummer L.N., Rezai, M.T., and Verstraeten, I.M., 2010, Availability of Water in the Kabul Basin, Afghanistan.  U.S. Geological Survey Fact Sheet, FS 2010-3037, 4p. (on-line abstract or on-line fact sheet in pdf format, 2.84 MB)

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 Resources Research, v. 46, W04518, doi:10.1029/2009WR008341 (on-line abstract of journal article)

Glynn, P.A., Larsen, M.C., Greene, E.A., Buss, H.L., Clow, D.W., Hunt, R.J., Mast, M.A., Murphy, S.F., Peters, N.E., Sebestyen, S.D., Shanley, J.B., and Walker, J.F., 2009, Selected Achievements, Science Directions, and New Opportunities for the WEBB Small Watershed Research Program, in Webb, R.M.T., and Semmens, D.J., eds, Proceedings of the Third Interagency Conference on Research in the Watersheds: Planning for an Uncertain Future: Monitoring, Integration, and Adaptation: U.S. Geological Survey Scientific Investigations Report 2009-5049, p. 39-52. (on-line article in pdf format, 359 KB)

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. (on-line abstract or on-line report in pdf format, 10.9 MB)

Rupert, M.G., and Plummer, L.N., 2009, Boundary of the Eagle River watershed valley-fill aquifer, Eagle County, North-Central Colorado, 2006-2007: U.S. Geological Survey Data Series 458, 12 p. (on-line abstract and to download data - available on-line only)

Rupert, M.G., and Plummer, L.N., 2009, Probability of elevated nitrate concentrations in groundwater in the Eagle River watershed valley-fill aquifer, Eagle County, North-Central Colorado, 2006-2007: U.S. Geological Survey Data Series 459, 15 p. (on-line abstract and to download data - available on-line only)

Rupert, M.G., and Plummer, L.N., 2009, Probability of unmixed young groundwater (defined using chlorofluorocarbon-11 concentrations and tritium activities) in the Eagle River watershed valley-fill aquifer, Eagle County, North-Central Colorado, 2006-2007: U.S. Geological Survey Data Series 460, 16 p. (on-line abstract and to download data - available on-line only)

Rupert, M.G., and Plummer, L.N., 2009, Probability of elevated volatile organic compound (VOC) concentrations in groundwater in the Eagle River watershed valley-fill aquifer, Eagle County, North-Central Colorado, 2006-2007: U.S. Geological Survey Data Series 461, 16 p. (on-line abstract and to download data - available on-line only)

Tobias, C.R., Böhlke, J.K., Harvey, J.W., and Busenberg, E., 2009, A simple technique for continuous measurement of time-variable gas transfer in surface waters: Limnology and Oceanography: Methods, v. 7, p. 185-195. (on-line abstract of journal article)

Busenberg, E., and Plummer, L.N., 2008, Dating groundwater with trifluoromethyl sulfurpentafluoride (SF5CF3), sulfur hexafluoride (SF6), CF3Cl (CFC-13), and CF2Cl2 (CFC-12), Water Resources Research, v. 44, W02431, doi:10.1029/2007WR006150. (on-line abstract or on-line paper in pdf format, 749 KB, published by American Geophysical Union, not subject to U.S. copyright)

Glynn, P.D., 2008 Future intrusion of oxygenated glacial meltwaters into the Fennoscandian shield: a possibility to consider in performance assessments for nuclear-waste disposal sites?, Review of SKB's Safety Assessment SR-Can: Contributions in Support of SKI's and SSI's Review by External Consultants, Swedish Nuclear Power Inspectorate, SSI Report 2008:06/SKI Report 2008:16, chapter 6, 15p.

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: Journal of Hydrologic Engineering, v. 13, no. 11, p. 1049-1068; DOI: 10.1061/(ASCE)1084-0699(2008)13:11(1049). (on-line abstract of journal article)

Hinsby, K., Højberg, A.L., Engesgaard, P., Jensen, K.H., Larsen, F., Plummer, L.N., and Busenberg, E., 2007, Transport and degradation of chlorofluorocarbons (CFCs) in the pyritic Rabis Creek Aquifer, Denmark: Water Resources Research, v. 43, W10423, doi:10.1029/2006WR005854. (on-line abstract of journal article)

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 2007-5049, 79 p. (on-line abstract or on-line report in pdf format, 4 MB)

Koh, D.C., Plummer, L.N., Busenberg, E., and Kim, Y., 2007, Evidence for terrigenic SF6 in groundwater from basaltic aquifers, Jeju Island, Korea: Implications for groundwater dating: Journal of Hydrology, v. 339, p. 93 - 104, doi:10.1016/j.jhydrol.2007.03.011 (on-line abstract of journal article)

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 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, chapter D, p. 135-137. (on-line chapter in pdf format, 435 KB)

Sebol, L.A., Robertson, W.D., Busenberg, E., Plummer, L.N., Ryan, M.C., and Schiff, S.L., 2007, Evidence of CFC Degradation in Groundwater Under Pyrite-Oxidizing Conditions: Journal of Hydrology, v. 347, p. 1-12. doi:10.1016/j.jhydrol.2007.08.009  (on-line abstract of journal article)

Yager, R.M., Kappel, W.M., and Plummer, L.N., 2007, Origin of halite brine in the Onondaga Trough near Syracuse, New York State, USA: Modeling geochemistry and variable-density flow: Hydrogeology Journal, v. 15, no. 7, p. 1,321-1,339. doi:10.1007/s10040-007-0186-9 (on-line abstract)

Yager, R.M., Kappel, W.M., and Plummer, L.N., 2007, Halite Brine in the Onondaga Trough near Syracuse, New York: Characterization and Simulation of Variable-Density Flow , U.S. Geological Survey Scientific Investigations Report 2007-5058 40 p. (on-line abstract and to download report and analytical data)

Busenberg, E., and Plummer, L.N., 2006, Potential use of other atmospheric gases: Use of Chlorofluorocarbons in Hydrology: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 10, p. 183-190. (on-line book chapter)

Busenberg, E., Plummer, L.N., Cook, P.G., Solomon, D.K., Han, L.F. Gröning, M., and Oster, H., 2006, Sampling and analytical methods: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 12, p. 199-220. (on-line book chapter)

Cook, P.G., Plummer, L.N., Solomon, D.K., Busenberg, E., and Han, L.F., 2006, Effects and processes that can modify apparent CFC age: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 4, p. 31-58. (on-line book chapter)

Han, L.F., Gröning, M., Plummer, L.N., and Solomon, D.K., 2006, Comparison of the CFC technique with other techniques (3H, 3H/3He, 85Kr): Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 11, p. 191-198. (on-line book chapter)

Koh, D.C., Plummer, L.N., Solomon, D.K., Busenberg, E., Kim, Y.-J., 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, v. 327, p. 258-275, doi:10.1016/j.jhydrol.2005.11.021.. (on-line abstract of journal article)

Plummer, L.N., Böhlke, J.K., and Doughten, M.W., 2006, Perchlorate in Pleistocene and Holocene groundwater in North-Central New Mexico: Environmental Science and Technology, v. 40, no. 6, p. 1757-1763. (on-line abstract or on-line journal article in pdf format, 409 KB, published 2006 by American Geophysical Union, not subject to U.S. copyright)

Plummer, L.N., and Busenberg, E., 2006, Chlorofluorocarbons in aquatic environments: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 1, p. 1-8. (on-line book chapter)

Plummer, L.N., and Busenberg, E., 2006, Chlorofluorocarbons in the atmosphere: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 2, p. 9-16. (on-line book chapter)

Plummer, L.N., Busenberg, E., and Cook, P.B., 2006, Principles of chlorofluorocarbon dating: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 3, p. 17-30.

Plummer, L.N., Busenberg, E., Cook, P.G., Oster, H., Han, L.F., and Gröning, M., 2006, Selected case studies using CFC data: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 9, p. 135-182.

Plummer, L.N., Busenberg, E., and Han, L.F., 2006, CFCs in binary mixtures of young and old groundwater: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 5, p. 59-72.

Plummer, L.N., Busenberg, E., and Han, L.F., 2006, Data interpretation in representative cases: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 8, p. 105-134.

Solomon, D.K., Cook, P.G., and Plummer, L.N., 2006, Models of groundwater ages and residence times: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 6, p. 73-88.

Solomon, D.K., Plummer, L.N., Busenberg, E., and Cook, P.G., 2006, Practical applications of CFCs in hydrological investigations: Use of Chlorofluorocarbons in Hydrology: A Guidebook, International Atomic Energy Agency (IAEA) STI/PUB/1238, (ISBN 92-0-100805-8), chapt. 7, p. 89-104.

Glynn, P.D., and Plummer, L.N., 2005, Geochemistry and the understanding of ground-water systems: Hydrogeology Journal, v. 13, p. 263-287. (on-line abstract of journal article)

Konikow, L.F., and Glynn, P.D., 2005, Modeling groundwater flow and quality, in Selinus, O., ed., Essentials of Medical Geology: Amsterdam, Elsevier, p. 737-765

Plummer, L.N., 2005, Dating of young groundwater, in Aggarwal, P.K., Gat, J.R., and Froehlich, K.F.O., eds., Isotopes in the Water Cycle: Past, Present, and Future of a Developing Science: Springer, Dordrecht, p.193-220.

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, no. 4, p. 1249-1261. (on-line abstract)

Nimmo, J.R., Rousseau, J.P., Perkins, K.S., Stollenwerk, K.G., Glynn, P.G., Bartholomay, R.C., and Knobel, L.L., 2004, Hydraulic and geochemical framework of the Idaho National Engineering and Environmental Laboratory vadose zone: Vadose Zone Journal, v. 3, p. 6-34. (on-line abstract)

Nimmo, J.R., Rousseau, J.P., Perkins, K.S., Stollenwerk, K.G., Glynn, P.G., Bartholomay, R.C., and Knobel, L.L., 2004, Hydraulic and geochemical framework of the Idaho National Engineering and Environmental Laboratory vadose zone: Vadose Zone Journal, v. 3, p. 6-34. (on-line abstract)

Plummer, L.N., Bexfield, L.M., Anderholm, S.K., Sanford, W.E., and Busenberg, E., 2004, 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. (on-line abstract or on-line report in pdf format, 22 MB)

Plummer, L.N., Bexfield, L.M., Anderholm, S.K., Sanford, W.E., and Busenberg, E., 2004, Hydrochemical tracers in the Middle Rio Grande Basin, USA: 1. Conceptualization of groundwater flow: Hydrogeology Journal, v. 12, no. 4, p. 359-388. (on-line abstract and on-line article or on-line article in pdf format, 1741 kb)

Plummer, L.N., Sanford, W.E., Bexfield, L.M., Anderholm, S.K., and Busenberg, E., 2004, Using geochemical data and aquifer simulation to characterize recharge and groundwater flow in the Middle Rio Grande Basin, New Mexico, in Hogan, J., Phillips, F.M., and Scanlon, B., eds., Groundwater Recharge in a Desert Environment: The Southwestern United States: Water Science and Applications Series, v. 9, American Geophysical Union, Washington, D.C., p. 185-216.

Rousseau, J.P., Landa, E.R., Nimmo, J.R., Cecil, L.D., Knobel, L.L., Glynn, P.D., Kwicklis, E.M., Curtis, G.P., Stollenwerk, K.G., Anderson, S.R., Bartholomay, R.C., Bossong, C.R., and Orr, B.R., 2005, Review of the transport of selected radionuclides in the interim risk assessment for the Radioactive Waste Management Complex, Waste Area Group 7 Operable Unit 7-13/14, Idaho National Engineering and Environmental Laboratory, Idaho: U.S. Geological Survey Scientific Investigations Report 2005-5026, 283 p. in 2 volumes. (on-line volume 1 (text) in pdf format, 2.4 MB or on-line volume 2 (figures) in pdf format, 3.3 MB)

Rupert, M.G., and Plummer, L.N., 2004, 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, 28 p. (on-line abstract or on-line report in pdf format, 788 kb)

Rupert, M.G., and Plummer, L.N., 2004, Ground-water age and flow at the Great Sand Dunes National Monument, south-central Colorado: U.S. Geological Survey Fact Sheet 2004-3051. (on-line fact sheet or fact sheet in pdf format, 207kb)

Sanford, W.E., Plummer, L.N., McAda, D.P., Bexfield, L.M., and Anderholm, S.K., 2004, Hydrochemical tracers in the Middle Rio Grande Basin, USA: 2. Calibration of a groundwater-flow model: Hydrogeology Journal, v. 12, no. 4, p. 389-407. (on-line abstract and on-line article or on-line article in pdf format, 1817 kb)

Sanford, W.E., Plummer, L.N, McAda, D.P., Bexfield L.M., and Anderholm, S.K., 2004, 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.

Shapiro, S.D., Busenberg, E., Focazio, M.J., and Plummer, L.N., 2004, Historical trends in occurrence and atmospheric inputs of halogenated volatile organic compounds in untreated ground water used as a source of drinking water: The Science of The Total Environment, v. 321, no. 1-3, p. 201-217. (on-line abstract)

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 2004-1392, 30 p. (on-line abstract or on-line report in pdf format, 1.5 MB)

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., eds., Arsenic in Ground Water: Geochemistry and Occurrence: Boston, Kluwer Academic Publishers, p. 295-327.

Brown, J.G., and Glynn, P.D., 2003, Kinetic dissolution of carbonates and Mn oxides in acidic water: measurement of insitu rates and reactive transport modeling: Applied Geochemistry, v. 18, no. 8, p. 1225-1239. (on-line abstract)

Burns, D.A., Plummer, L.N., McDonnell, J.J., Busenberg, E., Casile, G.C., Kendall, C., Hooper, R.P., Freer, J.E., Peters, N.E., Beven, K., and Schlosser, P., 2003, The geochemical evolution of riparian ground water in a forested piedmont catchment: Ground Water, v. 41, p. 913-925. (on-line abstract)

Glynn, P.D., 2003, Modeling Np and Pu transport with a surface complexation model and spatially variant sorption capacities: implications for reactive transport modeling and performance assessments of nuclear waste disposal sites: Computers and Geosciences, v. 29, no. 3, p. 331-349. (on-line abstract)

Lindsey, B.D., Phillips, S.W., Donnelly, C.A., Speiran, G.K., Plummer, L.N., Böhlke, J.K., Focazio, M.J.,. Burton, W.C., and Busenberg, E., 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. (on-line report, in pdf format)

Nelms, D.L., Harlow, G.E., Jr., Plummer, L.N., and Busenberg, E., 2003, Aquifer susceptibility in Virginia, 1998-2000: U. S. Geological Survey Water-Resources Investigations Report 03-4278, 58 p. (on-line report)

Plummer, L.N., Böhlke, J.K., and Busenberg, E., 2003, Approaches for ground-water dating, in Lindsay and others, eds., 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.

Shapiro, S.D., Busenberg, E., Plummer, L.N., and Focazio, M.J., 2003, 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, 31 p.

Shapiro, S.D., Plummer, L.N., Focazio, M.J., Busenberg, E., Kirkland, W., and Fernandez, M., 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 02-4173, 20 p.


FOR ADDITIONAL INFORMATION ABOUT THIS PROJECT, CONTACT
L. Niel Plummer
U.S. Geological Survey, 432 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192
Email: nplummer@usgs.gov
Phone: 703- 648-5841

Eurybiades Busenberg
U.S. Geological Survey, 432 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192
Email: ebusenbe@usgs.gov
Phone: 703- 648-5726

Pierre D Glynn (professional profile)
U.S. Geological Survey, 432 National Center, 12201 Sunrise Valley Drive, Reston, VA 20192
Email:pglynn@usgs.gov
Phone: 703- 648-5823

(For additional information see: http://water.usgs.gov/lab/cfc/)

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