Curriculum Vitae

John C. Walton, Ph.D., P.E.

            University of Texas at El Paso

El Paso, Texas 79968-0516

Ph: (915) 747-8699
Email: walton@utep.edu
Home Page: http://windowoutdoors.com

Professional Experience

(6/93 -                    Professor, Dept. Civil Engineering, University of Texas at El Paso, El Paso, Texas. Teaching and research in environmental engineering, hydraulics, ground water, and materials degradation. Development of new teaching methods.

 (8/03 - 8/05)         Interim Director, Center for Environmental Resource Management.

(12/03 -                  Adjunct Professor in Environmental Sciences, University of Texas School of Public Health.

(9/02 - 8/05)          Program Director, Environmental Science and Engineering Program.

 (1/92 - 5/93)         Senior Research Engineer, Southwest Research Institute, San Antonio, Texas. Analysis of engineered barriers performance in support of Nuclear Regulatory Commission evaluation of the proposed high level nuclear waste repository at Yucca Mountain. Developed a generalized reactive transport code for release rate and corrosion applications.

(9/87 - 1/92)          Scientific Specialist, EG&G Idaho, Idaho National Engineering Laboratory, Idaho Falls, Idaho. This position involved a combination of research and site support work. Projects included: migration of actinides through fractured rock in the unsaturated zone; regional scale contaminant migration in the Snake River Plain Aquifer; fluid flow and mass transport through concrete vaults and waste forms used to isolate nuclear waste; development of predictive models for concrete degradation; theoretical modeling of the electrochemistry inside localized corrosion cavities; release and migration of chlorinated solvents from a waste disposal site; cleanup of volatile organic compound spills by soil venting; modeling of in situ bioremediation; and leakage from flaws in geomembrane liners used in landfills and surface impoundments.

(1/91 - 12/91)        Affiliate Faculty, University of Idaho, Moscow, Idaho. Instruction of classes at the University Center located in Idaho Falls.

(4/84 - 9/87)          Senior Engineer, Rockwell Þ Westinghouse Hanford Operations (BWIP Project), Richland, Washington. Probabilistic risk assessment of natural hazards and operational accidents which could result in release of radioactive or hazardous materials to the environment. Performance assessment of nuclear waste disposal options.

(10/79 - 4/84)        Air Quality Specialist, Utah Bureau of Air Quality, Salt Lake City, Utah. Air dispersion modeling, ambient air monitoring, air pollution control engineering, regulation development, and data analysis. Development of probabilistic emissions limitations.

Education

(1991)                    University of Idaho; Ph.D. Chemical Engineering. Thesis: Mathematical Models of Waste Isolation Performance.

(1988)                    University of Washington; M.S. Chemical Engineering. Thesis: Mathematical Modeling Of Galvanic Corrosion Cells: Coupling of Corrosion and Geochemical Processes in Nuclear Waste Isolation.

(1981)                    University of Virginia; M.S. Environmental Science. Thesis: Redox Equilibria in a Freshwater Lake.

(1977)                    Western Illinois University; B.S. Biology. Minor Geology.

Public and University Service

EPWU, Stormwater Community Advisory Committee

TRB, NAS HMCRP06 Review Panel

City of El Paso Arroyos Committee

Frontera Land Alliance, Advisory Board

Chair, UTEP Graduate Council, 2007 – 2009

Chair, Faculty Welfare Committee, 2008 -

Research Interests

Hydrology. Influence of topography and solar radiation on plant communities. Contamination and recovery of river ecosystems. Surface and ground water interactions as they influence water quality. Mathematical modeling of saturated and unsaturated flow. Flow around and through waste disposal facilities. Monitoring, chemical analysis, and modeling of lake chemistry.

Environmental Remediation. Analysis of leach rates from various wasteforms including cementitious, glass, and spent fuel. Co-precipitation of metals with calcite.

Desalination. Membrane treatment of brackish water. Management of concentrates produced from desalination. Membrane distillation using solar energy.

Waste Disposal Technology. Leakage through flaws in geomembrane liners. Design and performance assessment of concrete vaults for waste disposal. Coupling between corrosion processes and localized geochemistry. Waste package design for high level nuclear waste disposal. Coupled modeling of thermal, hydrologic and chemical processes near nuclear waste packages. Influence of carbonation and oxidation on leaching from cementitious wasteforms.

Materials Performance. Long term degradation of concrete. Theoretical modeling of the electrochemistry inside localized corrosion cavities. Estimation of long term corrosion rates of copper and steel.

Chairman for PhD Students

8/96                 Rudy Antonio Machorro Sagastume, Water Quality at Lago de Izabal, Guatemala: Geochemical Characterization and Assessment of Trophic Status, Ph.D. Thesis in Geology (co-chair with Phillip Goodell).

5/01                 Huanmin Lu, Zero Discharge Desalination, Ph.D. Dissertation.

5/01                 Juan W. Santiago Clague Romero, Experimental and Theoretical Investigation of the Mobilization, Immobilization and Sequestration of Subsurface Metals Through Manipulation of Carbonate Equilibria, Ph.D. Dissertation (co-chair with N. Pingitore).

12/02               Francisco Martinez, Influence of Solar Radiation Factors on Desert Flora Site Selection, Ph.D. Dissertation.

5/03                 Juan Gomez, Mobilization and Immobilization of Heavy Metals in Contaminated Soils by CO2 Partial Pressure Manipulation, Ph.D. Dissertation.

5/03                 Reneé Hilton, Removal of Heavy Metals from Soils with Fulvic Acid Fractions, EDTA, and Citrate Chelates, Ph.D. Dissertation.

5/04                 Jaime Romero, Adsorption of Cr from Aqueous Solution onto Agave lechuguilla biomass, Ph.D. Dissertation.

12/04               Robert Rice, Risk Prediction and Design of Disposal Systems, Ph.D. Dissertation.

12/04               Jose Humberto Garcia, Determination of PM Compositions and Sources in the El Paso del Norte Region Using Time-Resolved Integrated Source and Receptor Models, Ph.D. Dissertation.

5/06                 Bill Hutchison, Groundwater Management in El Paso, Texas, Ph.D. Dissertation.

5/08                 Gautam Agrawala, Regional Groundwater Interpretation using Multivariate Statistical Methods, Ph.D. Dissertation.

12/08               Arturo Woocay, Multivariate Analysis of Groundwater Chemistry, Ph.D. Dissertation

Professional Activities and Consulting (last 10 years)

1993 -1999      Southwest Research Institute; Waste package performance assessment; modeling of coupled processes; container corrosion; waste package environment.

1995                Electric Power Research Institute; Yucca Mt. radioactive source term review.

1995-1996       Chem-Nuclear, Inc.; Degradation of concrete canisters and poly liners for North Carolina Low Level Radioactive Waste site.

1998                El Paso Water Utilities; External expert for review of hydrogeology examination.

1998                Idaho National Engineering and Environmental Laboratory; Expert panel on vadose zone processes and modeling.

1998 - 1999     Sandia National Laboratories; Yucca Mountain High Level Nuclear Waste Repository, near field geochemistry.

1996 - 2000     US Department of Justice; Expert witness on issues of contaminant transport. To date I have worked on three cases covering ground water contamination and air pollution.

2000 -              Portage Environmental; Degradation assessment of high level waste steel tank and vaults at the INL.

2001 -              Nye County, Nevada; Oversight of Yucca Mountain. Water chemistry monitoring.

2002 - 2005     Resolution Law Group, Expert witness, hydrogen sulfide exposure.

2006 -              Expert witness on El Paso flooding.

2008                US Department of Energy; Expert Review Panel for Tank Farm F Performance Assessment.

2009                US Department of Energy; Expert Review Panel for Saltstone Performance Assessment.

Publications and Presentations

 = refereed publication

1)                   Al-Qudah, O.M., J.C. Walton and A. Woocay (2009). Precipitation and Surface-Runoff Sampling in the Arid Regions – New Lysimeter Techniques. Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract H11D-0836, 2009. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 14, 2009

2)                   Al-Qudah, O.M.,  J.C. Walton, and A. Woocay Chemical Fingerprint of Surface-Runoff on Groundwater Recharge in the Arid Regions. C-4 Talk presented at: 2009 New Mexico Water Research Symposium, Socorro, NM, August 14, 2009. http://wrri.nmsu.edu/publish/sympabs/presentations2009.pdf

 

3)                   Hamdan, L.K., J.C. Walton and A. Woocay (2009). Unsaturated Zone Nuclear Waste Repository – A Safety Case Poster presented at: Devil’s Hole Workshop, Furnace Creek, CA, May 6-7, 2009.

 

4)                   Al-qudah, O., J.C. Walton, and A. Woocay (2009). Surface Runoff Chemistry in the Amargosa Desert. Presented at: Devil’s Hole Workshop, Furnace Creek, CA, May 6-7, 2009.

 

5)                   Al-Qudah, O.M., J.C. Walton and A. Woocay (2009). Processes Controlling Groundwater Recharge in the Amargosa Desert. Talk 394 presented at: 65rd Southwestern Regional Meeting of the American Chemical Society (ASC), El Paso, TX, November 4-7, 2009.     
 http://acs.confex.com/acs/swrm09/webprogram/Paper77113.html

 

6)                   Hamdan, L.K., J.C. Walton and A. Woocay (2009). Chemical and Physical Status of Water Pooled in a Failed Nuclear Waste Container. Talk 426 presented at: 65rd Southwestern Regional Meeting of the American Chemical Society (ASC), El Paso, TX, November 4-7, 2009.         
http://acs.confex.com/acs/swrm09/webprogram/Paper76634.html

 

7)                   Woocay, A., and J.C. Walton (2009). Isotopic evidence of past focused infiltration at Fortymile Wash. Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 30. Talk in Session No 3 Paper 15. Portland, OR, October 18-21, 2009. ISSN: 0016-7592

 

8)                   Al-Qudah, O.M., J.C. Walton, and A. Woocay Chemical evolution of groundwater in the Amargosa Desert. Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 218. Talk in Session No 77 Paper 5. Portland, OR, October 18-21, 2009. ISSN: 0016-7592

 

9)                   Hamdan, L.K., J.C. Walton and A. Woocay (2009). A case study for the performance of a nuclear geological repository in the unsaturated zone. Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 89. Poster in Session 27 Paper 15. Portland, OR, October 18-21, 2009. ISSN: 0016-7592

 

10)               Hamdan, L.K., J.C. Walton and A. Woocay (2008). Conditions inside Water Pooled in a Failed Nuclear Waste Container and its Effect on Radionuclide Release. Eos Trans. AGU, 90(52), Fall Meet. Suppl., Abstract H31E-0835, 2009. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 16, 2009

11)               Woocay, A., and J.C. Walton. Evidencia Isotópica de Infiltración Concentrada Pretérita en Fortymile Wash. Presented at the 2nd Annual CIPITECH conference, held in Delicias, CHIH, MX., on September 24, 2009. ISBN 978-4276-4108-3.

 

12)               Al-qudah, O., J.C. Walton, and A. Woocay. (2009). Investigation and Classification of Groundwater Redox Conditions in the Vicinity of Yucca Mountain. World Environmental and Waste Resources Congress 2009: Grest Rivers. Presented May 17-21, 2009, Kansas City, Missouri. Publisher: ASCE. ISBN13: 9780784410363

 

13)               Â Hamdan, L., J.C. Walton, and A. Woocay. 2009. Effect of Physical Processes on Radionuclide Release from Partially Failed Containers. Talk presented at: Waste Management Symposium 2009: Waste Management for the Nuclear Renaissance, Mar 1-5, 2009. Session 57. Publisher: Curran Associates, Inc. (Oct 2009) Pages: 5,143 (8 Vols) ISBN13: 9781615672523

 

14)               Al-Qudah O.M., A. Woocay and J.C. Walton,. “Groundwater Oxidizing and Reducing Conditions Near Yucca Mountain.” Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract H51B-0803, 2008. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 19, 2008.

15)               Hamdan, L.K., J.C. Walton and A. Woocay. (2008). “Conceptual Model for Radionuclide Release from the Engineered Barrier Systems (EBS) at Yucca Mountain.” Eos Trans. AGU, 89(53), Fall Meet. Suppl., Abstract H53E-1130, 2008. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 19, 2008.

16)               Â Hamdan, L. K. and J.C. Walton,. “Limitations on Radionuclide Release from Partially Failed Containers” Paper #: 1124-Q08-07, Abstract# 512698. Talk presented at 2008 Materials Research Society (MRS) Fall Meeting, Boston, MA, December 4, 2008. DOI: 10.1557

17)               Â Rice, R. W. and J. C. Walton, Factors Affecting Risk Predictions: Can Some Risk Metrics be More Accurately Predicted Than Others?, Nuclear Technology, Vol. 163, No. 1, p. 15-23,  2008.

18)               Â Woocay A. and J. C. Walton, Multivariate Analyses of Water Chemistry: Surface and Ground Water Interactions, Ground Water, Vol. 46, No. 3, pp. 437–449, 2008

19)               Â Romero-Gonzalez, J., J.C.Walton, J.R. Peralta-Videa, E. Rodrıguez, J. Romero, J.L. Gardea-Torresdey, Modeling the adsorption of Cr(III) from aqueous solution onto Agave lechuguilla biomass: Study of the advective and dispersive transport , Journal of Hazardous Materials, Vol, 161, Issue 1, pp. 360-365, 2009.

20)               Â Danko, G., Walton, J., and Bahrami, D., Increased Storage Capacity at Yucca Mountain Favors Thermal Management for A Cold Repository., Nuclear Technology, Vol. 163, No. 1, p. 47-61, 2008.

21)               Â Woocay, A., and J.C. Walton. 2008. Infiltration history at Fortymile Wash. International High-Level Radioactive Waste Management Conference (IHLRWMC), Las Vegas, Nevada. La Grange Park, Illinois: American Nuclear Society. September 7-11, 2008, p. 41-46. ISBN: 978-0-89448-062-1

22)               Â Al-Qudah, O., A. Woocay, and J.C. Walton. 2008. Yucca Mountain Region Groundwater Geochemical Data Analyses. International High-Level Radioactive Waste Management Conference (IHLRWMC), Las Vegas, Nevada. La Grange Park, Illinois: American Nuclear Society. September 7-11, 2008, p. 87-94. ISBN: 978-0-89448-062-1

23)               Â Hamdan, L.K., J.C. Walton, and A. Woocay. 2008. Limitations and patters of radionuclide release from partially failed containers. International High-Level Radioactive Waste Management Conference (IHLRWMC), Las Vegas, Nevada. La Grange Park, Illinois: American Nuclear Society. September 7-11, 2008, p. 348-351. ISBN: 978-0-89448-062-1

24)               Â Rice, R.W., and J.C. Walton. 2008. Numerical Illustration: Effects of Uncertainty and Bias on Risk Predictions. International High-Level Radioactive Waste Management Conference (IHLRWMC), Las Vegas, Nevada. La Grange Park, Illinois: American Nuclear Society. September 7-11, 2008, p. 588-592. ISBN: 978-0-89448-062-1

25)               Pekar, K., J.C. Walton, and P. Goodell. 2008. Modeling of Transport Rates Through Unsaturated Soil at Peña Blanca. International High-Level Radioactive Waste Management Conference (IHLRWMC), Las Vegas, Nevada. La Grange Park, Illinois: American Nuclear Society. September 7-11, 2008, p. 196-203. ISBN: 978-0-89448-062-1

26)               Walton, J.C., Fate and Transport of Contaminants in the Environment, College Publishing, Glen Allen, Virginia, ISBN: 1-932780, 2008,  (textbook)

27)               Pekar, Katrins, Phillip Goodell, John Walton, Elizabeth Anthony, and MinhuaRen, Equation fitting U-Series Radionuclide Transport Through Soil at Pena Plana, Chihuahua, Mexico, American Geophysical Union 2007 Joint Meeting, May 22, 2007, Acapulco, Mexico (abstract and presentation).

28)               Walton, J.C., L.K. Hamdan, and A. Woocay. 2008. “Controlling Features and Processes for Radionuclide Release from Yucca Mountain.” Presented at: Devil’s Hole Workshop, Furnace Creek, CA, May, 2008.

29)               Al-Qudah, O., A. Woocay, and J.C. Walton. “Geochemical Characterization of Groundwater in Yucca Mountain Region.” Presented at: Devil’s Hole Workshop, Furnace Creek, CA, May, 2008.

30)               Walton, John, August 2006 El Paso Flooding: Technical and Policy Factors, Universities Council on Water Resources, Boise Idaho, Plenary Speaker, July, 2007.

31)               Woocay, A., and J.C. Walton, (2007). “Climate Change Effects on Groundwater Recharge East of Yucca Mountain.” Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract H11F-0843, 2007. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 10, 2007.

32)               Walton, John, A. Jaimes and A. Woocay, (2007). “Infiltration History and Spatial Variability Derived from Chloride Mass Balance.” Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract H11C-0674, 2007. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 10, 2007.

33)               Agrawala G.K., A. Woocay and J.C. Walton, (2007). “Statistical and Spatial Analysis of Borderland Ground Water Geochemistry.” Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract H11C-0677, 2007. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 10, 2007.

34)               Woocay, A. and J. Walton, Infiltration History and Spatial Variability Derived from Chloride Mass Balance and Groundwater Chemistry, Presented at: Devils Hole Workshop, Death Valley, May 2007.

35)               Â Bahrami, D., G. Danko, and J. Walton, Water, Vapor, and Salt Dynamics in a Hot Repository, Materials Research Society , Scientific Basis for Nuclear Waste Management XXX, Editors: Darrrell Dunn, Christophe Poinssot, and Bruce Begg, Materials Research Society, Pennsylvania, 2007.

36)               Â Rice, Robert and John Walton, Design factors affecting the flow of water through below-ground concrete vaults, J. Envir. Engr., Volume 132, Issue 10, pp. 1346-1354, October 2006.

37)               Woocay, Arturo and Walton, John C., (2006), Groundwater Chemistry Analysis by Multivariate Statistical Methods, Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract H41B-0405, 2006. Presented at: American Geophysical Union Fall Meeting, San Francisco, CA, December 14, 2006

38)               Â José H. García, Wen-Whai Li, Nidia Cárdenas, Richard Arimoto, John Walton and David Trujillo, Determination of PM2.5 sources using time-resolved integrated source and receptor models, Chemosphere, Volume 65, Issue 11, December 2006, Pages 2018-2027.

39)               Woocay, Arturo and Walton, John C., (2006), Evidence of Past Focused Infiltration at Fortymile Wash, Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 335, 2006. Presented at: GSA Annual Meeting, Philadelphia, PA, October 24, 2006.

40)               Walton, J, G. Danko, and D. Bahrami, Effect of cyclic, sporadic, or episodic processes
on evolution of environments in a repository in Yucca Mountain, Invited Presentation at the Nuclear Waste Technical Review Board Corrosion Workshop, Las Vegas, NV, September, 2006.

41)               Agrawala, Gautam K., Woocay, Arturo and Walton, John C.,(2006) Multivariate Statistical Analysis of the Hueco-Mesilla Basin Groundwater Aquifer System-Presented at 2006 Groundwater Summit in San Antonio,TX,2006

42)               Agrawala, Gautam K. and Walton, John C.,(2006),Multivariate Statistical Analysis of the Tularosa Basin, Presented at 2006 New Mexico Water Research Symposium, Socorro, NM,2006

43)               Agrawala, Gautam K and Walton, John C.,(2006),Multivariate Statistical Analysis of the Hueco-Tularosa Basin, Presented at 2006 AGU Fall Meeting, San Francisco, CA,2006

44)               Â Hall, Drew and John Walton, Conceptual model for flow separation processes affecting waste package chemical environment, Yucca Mountain, Nevada, Applied Geochemistry, Volume 21, Issue 6, Pages 859-869, June 2006.

45)               Â Veranth, John M, Moss, Tyler A., Chow, Judith C., Labban, Raed, Nichols, William K., Walton, John C., Watson, John G, Yost, Garold S., Correlation of In Vitro Cytokine Responses With the Chemical Composition of Soil-Derived Particulate Matter, Environ Health Perspect. 2006 March; 114(3): 341–349.

46)               Â Woocay, Arturo and Walton, John C., Climate Change Effects on Yucca Mountain Region Groundwater Recharge, IHLRWM 2006, Las Vegas, NV, April 30-May 4, 2006, 191-198, 2006

47)               Rice, Robert and John Walton, Factors Affecting Risk Predictions: Proposed Rule And Other Risk Metrics, IHLRWM 2006, Las Vegas, NV, April 30-May 4, 2006, 191-198.

48)               Woocay, Arturo and Walton, John C., (2006), Multivariate Statistical Methods Applied to Surface and Groundwater Interactions, Abstract Book of the 2006 Ground Water, p. 94, 2006. Presented at: NGWA 2006 Ground Water Summit, San Antonio, TX, April 22-27, 2006.”

49)               Romero-Gonzalez, J, J.C. Walton, J. R. Peralta-Videa, E. Rodr’guez, S. L. Ramirez, J.L. Gardea-Torresdey.Study of the advective and dispersive transport of the binding of Cr(III) from aqueous solution onto Agave lechuguilla biomass, Journal of Hazardous Materials, in review.

50)               Woocay, Arturo and Walton, John C., Infiltration Dates Derived from Chloride Mass Balance, Poster presented at: Devil’s Hole Workshop, Furnace Creek, CA, April, 2006.

51)               Walton, John and Arturo Woocay, Nye County Ground Water Chemistry Analysis Report for the Early Warning Drilling Program April 2004 - March 2005, NWRPO-2005-01, May 2005.

52)               Goodell, Philip, Walton, John, and Rodriguez, Alfredo, Future Studies At Pena Blanca: Radionuclide Migration In The Vadose Zone Of An Alluvial Fan, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 453, 2005.

53)               Walton, John, Goodell, Philip, Beshears, Charles, French, Diana, and Kelts, Aaron,  Radionuclide Dispersion Rates By Aeolian, Fluvial, and Porous Media Transport, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 268, 2005.

54)               Woocay, Arturo Walton, John C., and King, Michael, Multivariate Statistical Methods Applied to Interpretation of Hydrological Data, Presented at: 2005 New Mexico Water Research Symposium, Socorro, NM, August 16, 2005.

55)               Woocay, Arturo and Walton, John C., Focused Infiltration Effects on Amargosa Desert Regional Groundwater Chemistry, Presented at: Devil's Hole Workshop, Furnace Creek, CA, May, 2005.

56)               Woocay, Arturo and John Walton, (2005), Statistical Analysis of Yucca Mountain Regional Groundwater Chemistry Evolution, Presented at: Waste Management Symposium, Mar, 2005.

57)              Agrawala, Gautam K. and Walton, John C., Source Analysis for VOC Data at The Camino Real Landfill, Sunland Park, NM, Presented at the Twentieth International Conference on Solid Waste Technology & Management, Philadelphia, PA, 2005.

58)               Agrawala, Gautam K. and Walton, John C.,(2005),Multivariate Statistical Analysis of the Membres Basin Groundwater Aquifer System-Presented at 2005 New Mexico Water Research Symposium, Socorro, NM,2005

59)               Â Romero-Gonzalez, J., Cano-Rodriguez, I., Walton, J.C.,  Peralta-Videa, J.R., Rodriguez, E., Gardea-Torresdey, J.L.  Column studies of the adsorption and reduction of Cr(VI) from an aqueous solution by Agave lechuguilla biomass. Revista Mexicana de Ingenieria Quimica 4, 257-268, 2005

60)               Rodr’guez-Pineda, J. Alfredo, Goodell, Philip, Dobson, Patrick F., Walton, John, Oliver, Ronald D., De La Garza, Rodrigo, And Harder, Steve, Regional Hydrology of The Nopal I Site, Sierra De Pe–a Blanca, Chihuahua, Mexico, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 196, 2005.

61)               Woocay, Arturo and Walton, John C., (2005), Groundwater Evidence of Past Climate Change in The Amargosa Desert, Geological Society of America Abstracts with Programs, Vol. 37, No. 7, p. 468, 2005. Presented at: GSA Annual Meeting, Salt Lake City, UT, October 19, 2005.

62)               Walton, John and Woocay, Arturo, (2005), Nye County Ground Water Chemistry Analysis Report for the Early Warning Drilling Program April 2004 - March 2005, NWRPO-2005-01, May 2005.

63)               Â Li, W. -W., N. Cardenas, R. Arimoto, J. Walton, D. Trujillo, H. Morales. 2004.  PM source identification at Sunland Park, New Mexico using a simple heuristic meteorological and chemical analysis. Journal Air and Waste Management Association, 55:352–364, March 2005.

64)               Â Walton, J.C., F. Martinez-Gonzalez, and R. Worthington, Desert Vegetation and Timing of Solar Radiation, Journal of Arid Environments, Volume 60, Issue 4, Pages 697-707, March 2005.

65)               H. Becerra, J. Walton, H. Lu, Salinity Gradient Solar Ponds: A Useful Technology in Concentrate Management and Desalination?, Presented at: 2004, National Salinity Management and Desalination Summit, Las Vegas, December 13-14, 2004.

66)               A. Woocay and J. Walton, Multivariate Analysis of Amargosa Valley, NV Groundwater Chemistry, Presented at: AGU Fall Meeting, San Francisco, 2004.

67)               A. Woocay and J. Walton, Groundwater Flow Paths and Trends in Nye County, Nevada Based Upon Correspondence Analysis of Major Ion Chemistry, Presented at:Devil’s Hole Workshop, Pahrump, NV, June 2-4, 2004.

68)               H. Becerra, J. Dowdy, H. Lu, and J. Walton, Zero Discharge Waste Brine Management for Solar Desalination Plants, World Renewabel Energy Congress VIII, August 29 - September 3, 2004, Denver, Colorado.

69)               Walton, J.C. and D. Hall, Alternate Conceptual Models for Engineered Barrier System Chemistry and Performance, Presented to: Nuclear Waste Technical Review Board, January 19, 2004, Las Vegas.

70)               Arimoto, R., W.-W. Li, N. Cardenas, J. Walton, D. Trujillo, H. Morales, S. Sage, C. Schloesslin, 2003.  Investigations of the Low Wind Particulate Matter Spikes at the Sunland Park, New Mexico Monitoring Site.  Paper presented in the 2004 Border Regional Environmental Conference, Feb. 10 - 12, 2004, Laredo, TX

71)               Â J. H. Garc’a, W.-W. Li, J. Walton, R. Arimoto, C. Schloeesslin, S. Sage, R. Okrasinski, J. Greenlee, 2004.  Characterization and Implication of Potential Fugitive Dust Sources in the Paso del Norte Region, Jl. Science of the Total Environment. Volume 325, Issues 1-3, Pages 95-112

72)               Danko, George, Davood Bahrami, and John Walton, Status of Nye County Ventilation Studies, Invited presentation to: Nuclear Waste Technical Review Board, January 19, 2004, Las Vegas.

73)               Â Peralta-Videa, J.R., J.L. Gardea-Torresdey, J. Walton, W. P. Mackay, M. Duarte-Gardea, Effects of Zinc upon Tolerance and Heavy Metal Uptake in Alfalfa Plants (Medicago sativa), Bull. Environ. Contam. Toxicol. 70:1036-1044, 2003.

74)               Garcia, J. H., W.-W. Li, J. Walton, R. Arimoto, C. Schloesslin, S. Sage, R. Okrasinski, J. Greenlee, W. Gutman.  2003.  Implications on Contributing Sources by Chemical Composition in Regional Surficial Soil, Paper presented in the North American Research Strategy for Tropospheric Ozone (NARSTO) Workshop on Innovative Methods for Emission Inventory and Evaluation, Oct. 14 - 17, 2003, Austin, Texas

75)               Hall, Drew and John Walton, Patterns and Trends in the Water Chemistry of Nye County Wells. Presented at: Devil’s Hole Workshop and Death Valley Regional Flow Model Technical Interaction Meeting, May, 2003.

76)               Hall, Drew and John Walton, Nye County Ground Water Chemistry Monitoring, Sampling and Analysis Report for the Early Warning Drilling Program Fiscal Year 2002, May, 2003.

77)               Walton, John and Drew Hall, Evaporation, Reconstitution, and Water Chemistry, Invited presentation at: NRC and DOE Performance Assessments: Assumptions and Differences, Washington, DC, March 25-27, 2003.

78)               Paschold, H., H. Morales, W. Li, and J. Walton.  2002.  Evaporative Cooler Effects on Indoor PM concentrations under laboratory conditions.  Paper presented in the Rio Bravo/Rio Grande Environmental Conference, South Padre Island, Texas, Feb. 20 - 23, 2002.

79)               Â Hall, Drew and John Walton, Physical Separation Processes and EBS Water Chemistry – A Modeling Study, 10th International High Level Waste Management Conference, American Nuclear Society, Las Vegas, Nevada, April, 2003.

80)               Â Paschold, H, W. Li, H. Morales, and J. Walton, Laboratory Study of the Impact of Evaporative Coolers on Indoor PM Concentrations, Atmospheric Environment, 37:1075-1086 (2003).

81)               Lu, H., J. Walton, S. Irvine, and H. Remmers, Memorandum Report: Conceptual Application and Feasibility of Salinity Gradient Solar Pond Technology in San Joaquin Valley, California, DWR of California, 2002.

82)               Paschold, H., H. Morales, W. Li, and J. Walton.  2002.  Field study of the impact of evaporative coolers on PM concentrations.  Paper presented in the Rio Bravo/Rio Grande Environmental Conference, South Padre Island, Texas, Feb. 20 - 23, 2002.

83)               Walton, John and Huanmin Lu, US Experience with Solar Ponds: Current and Future Trends, Presented at: Euromed Conference on Solar Ponds, Tunis, Tunisia, December, 2001.

84)               Garcia, J., W. Li, J. Walton, 2001.  Multivariate analysis of wintertime inorganic PM data.  The 2001 SCERP Conference: Promoting Policies to Implement the Vision.  October 17-19, 2001, Universidad Autonoma de Baja California, Mexico.

85)               Lu, Huanmin, John Walton, Andrew Swift, and Herbert Hein, Fundamentals of Solar Pond Operation and Technology Advancements at the El Paso Solar Pond, Presented at: Euromed Conference on Solar Ponds, Tunis, Tunisia, December, 2001.

86)               Walton, John and Huanmin Lu, Solar Pond Coupled Desalination and Electricity Production, Presented at: Euromed Conference on Solar Ponds, Tunis, Tunisia, December, 2001.

87)               Gomez, J.D., J. Walton, and N.E. Pingitore, Mobilization of Heavy Metals in Contaminated Soils Using CO2 Manipulation, 2001 American Water Resources Conference, Albuquerque, 2001.

88)               Hilton, R.V., J. Walton, and N.E. Pingitore, Mobilization and Sequestration of Subsurface Metals Through pCO2 Manipulation, 2001 American Water Resources Conference, Albuquerque, 2001.

89)               Walton, John, Upstream Water Reuse and Development Impacts on Rio Grande Water Quality, The Southwest Center for Environmental Research and Policy’s  2001 Annual Technical Conference, entitled “Sustainable Development in the U.S.-Mexico Border Region,” Mexicali, B.C., Mexico on October, 2001.

90)               Â Lu, H., J. Walton and A. Swift, "Desalination Coupled with Salinity-Gradient Solar Ponds," Desalination 136 (2001) 13-23.

91)               Â Walton, John and Gregory Ohlmacher, Surface and Ground Water Interactions: El Paso – Ciudad Juarez Region, SCERP Monograph Series, No. 2, Water issues along the U.S.-Mexican border, Ed: Paul Westerhoff, .pp. 21-29, San Diego State University Press, 2000.

92)               Walton, J.C., H. Lu, C. Turner, A. Swift, Desalination in the Inland Desert, Invited Keynote Presentation at: International Conference on Desalination Strategies in South Mediterranean Countries, Jerba, Tunisia, September, 2000.

93)               Â Lu, H. J. Walton and A. Swift, "Zero Discharge Desalination," Desalination & Water Reuse, Vol. 10. No. 3, November/December 2000.

94)               Â Walton, C.L. and J.C. Walton, Efficiency of bicycle chain drives – results at constant velocity and supplied power, Human Power No. 51, IHPVA, San Luis Obispo, CA., pp. 14-15, 2000.

95)               Garcia, Jose H., John C. Walton, and Wen-Whai Li, Oxone Prediction Based onSimple Meteorological Models, Proceedings Texas Section-ASCE Fall 2000 Meeting, El Paso, Texas, p. 11-20, 2000.

96)               Clague, Juan, W., Nicholas E. Pingitore, and John C. Walton, Induced Subsurface Mineral Growth to Sequester Radionuclides and Toxic Elements by Coprecipitation with Calcite, Proceedings Texas Section-ASCE Fall 2000 Meeting, El Paso, Texas, p. 33-42, 2000.

97)               Magallon, Angel G. and John C. Walton, Development Impacts on Rio Grande Water Quality, Proceedings Texas Section-ASCE Fall 2000 Meeting, El Paso, Texas, p. 281-290, 2000.

98)               Lu, Huanmin, John C. Walton, and Herbert Hein, Thermal Desalination Using MEMS and Salinity-Gradient Solar Pond Technology, US Bureau of Reclamation, Desalination Research and Development Program Report, (in press).

99)               Walton, John, Huanmin Lu, Charles Turner, Sergio Solis, and Herb Hein, Solar and Waste Heat Desalination by Membrane Distillation, US Bureau of Reclamation, Desalination Research and Development Program Report, (in press).

100)            Â Lu, H. and J.C. Walton, Operation of Multi-Effect Multi-Stage Desalination Coupled with a Salinity-Gradient Solar Pond, ASME/ASES Solar Energy Conference, June 16-21, 2000, Madison, Wisconsin, 2000.

101)            Â Walton, J.C., H. Lu, and S. Solis, Air Gap Membrane Distillation by Salinity Gradient Solar Pond, ASME/ASES Solar Energy Conference, June 16-21, 2000, Madison, Wisconsin, 2000.

102)            Lu, Huanmin, J.C. Walton, A.H.P. Swift, and C. Turner, Zero Discharge Desalination, American Desalination Association (ADA) North American Biennial Conference, August 6-9, 2000, Lake Tahoe, Nevada.

103)            Walton, John, Sergio Solis, Huanmin Lu, Charles Turner, Herbert Hein, Membrane Distillation Desalination with a Salinity Gradient Solar Pond, 17th Annual Conference on Technology/Planning, Newton Marriott, Boston, Business Communications Co., Norwalk, Connecticut, 1999 (presentation and paper in proceedings), 1999.

104)            Turner, C. D., J. C. Walton, E. Bermea, M. Quezada, Salinity and TOC Removal Using Nanofiltration, US Bureau of Reclamation, Contract No. 1425-97-FC-81-30006E, US Bureau of Reclamation Water Treatment Technology Program Report No. XXX, 1999.

105)            Turner, C. D., J. C. Walton, J. D. Moncada, M. Tavares, Brackish Groundwater Treatment and Concentrate Disposal for the Homestead Colonia El Paso, Texas, US Bureau of Reclamation Water Treatment Technology Program Report No. 32, 1999.

106)            Â Walton, J., G. Ohlmacher, D. Utz, M. Kutainawala, Response of the Rio Grande and Shallow Ground Water in the Mesilla Bolson to Irrigation, Climate Stress, and Pumping, Environmental and Engineering Geoscience, Vol. V, No. 1, pp. 41-50, 1999.

107)            Â MD. Sazzad Bin Shafique, John C. Walton, Neyda Guiterrez, Robert W. Smith, and Anthony Tarquin, Influence of Carbonation on Leaching of Cementitious Wasteforms, ASCE Journal of Environmental Engineering, Vol. 124, No. 5, 1998.

108)            Walton, John, Charles Turner, Gregory Ohlmacher, and Dennis Utz, Interaction of Shallow Groundwater and the Rio Grande, Presented at: Cross Currrents in Water Policy UCOWR 98, Portland, Oregon, August, 1998.

109)            Walton, John, Gregory Ohlmacher, and Dennis Utz, Surface/Ground Water Interactions and Water Quality Along the Rio Grande/ Rio Bravo, Presented at: Association of Borderland Studies, Annual Meeting, Nogales Arizona, February, 1998.

110)            Walton, John, Water Quality and Coupling between Surface and Ground Water: West Texas, Southern New Mexico, and Northern Chihuahua, Presented at: Southwest Center for Environmental Research and Policy, El Paso Texas, 1997.

111)            ¬ Walton, John C., Ahmad Arif Shahjahan, David LeMone, Saifuddin Ahmed, and Aida Velasquez, Design of Concrete Vaults for Lower Cost and Improved Long Term Performance, Waste Management 97’, University of Arizona, Session 27, Number 3, Hydrogeologic and Geochemical Aspects of Waste Disposal (on CD-ROM), 1997.

112)            Johnson, F., M.P. Tavares, J.C. Walton, and C.D. Turner, Utilization of Brine Reject to Promote Self-Sealing of Soil Medium, 1997 CSCE/ASCE Environmental Engineering Conference, Editors: Stephen Stanley, Christopher Ward, and Daniel Smith, Edmonton, Alberta, Canada, 22-26 July, 1997, published by: Canadian Society for Civil Engineering, 2155 Guy St., Suite 840, Montreal, PQ, H3H 2R9, 1997.

113)            Â Walton, John, Masudur Rahman, David Casey, Miguel Picornell, and Floyd Johnson, Leakage Through Flaws in Geomembrane Liners, ASCE J. Geotechnical and Geoenvironmental Engineering, Vol. 123., No. 6, p. 534-539, 1997.

114)            ¬ Walton, J.C., R.W. Smith, A. Tarquin, P. Sheeley, R. Kalana, J. Gwynne, N. Gutierrez, M.S. Bin-Shafique, M. Rodriquez, and R. Andrade, Role of Carbonation in Long Term Performance of Cementitious Wasteforms, In: Mechanisms of Chemical Degradation of Cement-based Systems, Edited by K.L. Scrivener and J. F. Young, E&FN Spon, London, 1997.

115)            Â Walton, J.C., MD. Sazzad Bin-Shafique, Robert W. Smith, Neyda Guiterrez, Anthony Tarquin, Role of Carbonation in Transient Leaching of Cementitious Wasteforms, Environmental Science and Technology, 31, 2345-2349, 1997.

116)            Utz, Dennis, John Walton, Gregory Ohlmacher, Chari Bryan, Response of Shallow Groundwater to Irrigation and Climate Stress: Mesilla and Hueco Valleys, GSA Abstracts with Programs, Vol. 29, No. 2, February, 1997.

117)            Turner, C. J. Moncada, and J.C. Walton, Designing for Brine Reject Utilization in a Desert Environment, American Water Works Association 1997 Membrane Technology Conference, February 1997.

118)            Gutierrez, N. S.Bin-Shafique, J.C. Walton, A. Tarquin, P. Sheeley, R. Smith, M. Rodriguez, and R. Andrade, Effects of Carbonation on the Long-Term Leaching Performance of Cementitious Wasteforms, 1996 HSRC/WERC/EPA Joint Conference on the Environment Proceedings, p. 222-230, www.engg.ksu.edu/HSRC/Proceedings.html, 1996.

119)            Walton, J.C., D. Casey, C. Anker, and D. LeMone, Optimization of Contaminant Removal for Heterogeneous Systems by Soil Venting, 1996 HSRC/WERC/EPA Joint Conference on the Environment Proceedings, p. 268-278, www.engg.ksu.edu/HSRC/Proceedings.html, 1966.

120)            Â Walton, J.C. and C.B. Anker, Secondary Effects of Soil Venting and Potential Low Cost Enhancements, Ground Water Monitoring and Remediation, Vol: 16, No. 3, p. 91-97, 1996.

121)            Casey, D., J. Walton, C.B. Anker, and D. V. LeMone, Energy Considerations and Soil Temperature Changes during Soil Vapor Extraction: Waste Management 96, American Nuclear Society, International Atomic Energy Agency, United States Department of Energy, and University of Arizona, Session 30 Environmental Remediation, Paper 30-27, WM-96 CD-ROM, 4 figs., 11p., 1996.

122)            Â Walton, J.C., G. Cragnolino, and S.K. Kalandros, Numerical Modeling of Crevice Corrosion for Passive and Active Metals, Corrosion Science, Vol. 38, No. 1, p. 1, 1996.

123)            Casey, D., J. Walton, C. Anker, and D. V. LeMone, Energy Considerations and Soil Temperature Changes during Soil Vapor Extraction (Abst.): Southwest Section of the American Association of Petroleum Geologists, Environmental Sciences Division, Environmental Challenges at the Triple Point, p. 8. (abstract and poster presentation), 1996.

124)            Walton, J., D. V. LeMone, and D. Casey. Coupling between Water Chemistry and Thermal Output at Unsaturated Repositories: Southwest Section of the American Association of Petroleum Geologists, Environmental Sciences Division, Environmental Challenges at the Triple Point, p. 13. (abstract and poster presentation), 1996.

125)            Codell, R.B., J.C. Walton, and B. Sagar, Source Term Module, in: R.G. Wescott, M.P. Lee, N.A. Eisenberg, T.J. McCartin, R.G. Baca, editors, NRC Iterative Performance Assessment Phase 2, NUREG-1464, 1995.

126)            John Walton, Anthony Tarquin, Robert Smith, Paul Sheeley, Ravishankar Kalyana, Neyda Gutierrez, John Gwynne, Mayela Rodriquez, MD Sazzad Bin-Shafique, Role of Carbonation in Long Term Performance of Cementitious Wasteforms, Presented at: DOE Environmental Restoration Conference, August, 1995.

127)            Cragnolino, G., N. Sridhar, and J. Walton, An Approach to Analysis of High-Level Nuclear Waste Container Performance In a Repository Under Unsaturated Conditions, Corrosion/95 Conference Oral Presentation, March 26-31, Orlando Florida, 1995.

128)            Walton, J., D. LeMone, and D. Casey, Coupling Between Water Chemistry and Thermal Output at Unsaturated Repositories, in: High Level Radioactive Waste Management: Proceedings of the Sixth Annual International Conference, American Society of Civil Engineers, NY, NY, p. 382-384, 1995.

129)            Â Lichtner, P.C, J. Song, T.Y. Torng, and John Walton, SCCEX: A Computer Code for Substantially Complete Containment Example Analysis of a Reference Container: Version 1.01, Center for Nuclear Waste Regulatory Analyses, San Antonio, TX, January, 1995.

130)            Â Walton, J., Influence of Evaporation on Waste Package Environment and Radionuclide Release from a Tuff Repository, Water Resources Research, Vol. 30, No. 12, pp. 3479-3487, 1994.

131)            Â Walton, J.C., Performance of Cementitious Waste Forms in Below Ground Vaults, ASCE Journal of Environmental Engineering, Vol. 120, No. 6, p. 1507-1523, 1994.

132)            Â Lichtner, Peter C. and John C. Walton, Near Field Liquid-Vapor Transport in a Partially Saturated High-Level Nuclear Waste Repository, CNWRA 94-022, 1994.

133)            Â Torng, Tony, Peter Lichtner, and John Walton, SCCEX: A Computer Code for Substantially Complete Containment Example Analysis of a Reference Container, Center for Nuclear Waste Regulatory Analyses, San Antonio, TX, July, 1994.

134)            Â McNeil, M.B. and J. C. Walton, Coupled Mass-Transport and Chemical-Equilibrium Modelling of Bronze Disease, in: High Level Radioactive Waste Management: Proceedings of the Fifth Annual International Conference, American Society of Civil Engineers, NY, NY, p. 1014-1019, 1994.

135)            Â McCartin, T., R. Codell, R. Neel, W. Ford, R. Wescott, J. Bradbury, B. Sagar, and J. Walton, Models for Source Term, Flow, Transport, and Dose Assessment in NRC’s Iterative Performance Assessment, Phase 2, in: High Level Radioactive Waste Management: Proceedings of the Fifth Annual International Conference, American Society of Civil Engineers, N.Y., N.Y., p. 1469-1479, 1994.

136)            Â Smith, R.W., J.C. Walton, and M. Rahman, Effects of Recrystallization on Time Variant Sorption of Radionuclides onto Steel Corrosion Products, Mat. Res. Soc. Symp. Proc., Vol. 333, p. 713-718, 1994.

137)            Â V. Colten-Bradley and J.C. Walton, Preliminary Analysis of Potential Chemical Environments Inside Failed Waste Containers at the Proposed Yucca Mountain Repository, Mat. Res. Soc. Symp. Proc., Vol. 333, p. 755-759, 1994.

138)            Â Walton, J.C., N. Sridhar, G. Cragnolino, and T. Torng, An Approach to Analysis of High Level Waste Container Performance in an Unsaturated Repository Environment, Mat. Res. Soc. Symp. Proc., Vol. 333, p. 863-867, 1994.

139)            Casey, D.R., M. Rahman, J. Walton, and M. Picornell, Flow Rate Through Flaws in Flexible Membrane Liners: A Complete Study of the Controlling Factors, Proceedings of Fourteenth Annual American Geophysical Union Hydrology Days, H.J. Morel-Seytoux, editor, Hydrology Days Publications, Atherton, CA, p. 23-30, 1994.

140)            Â Sridhar, N., G.A. Cragnolino, J.C. Walton, and D. Dunn, Prediction of Localized Corrosion Using Modeling and Experimental Techniques, in Cragnolino and Sridhar Editors: Application of Accelerated Tests to Service Life Prediction of Materials, ASTM, STP 1194, Philadelphia, 1994.

141)            Â Cragnolino, G. N. Sridhar, J. Walton, R. Janetzke, T. Torng, J. Wu, and P. Nair, Substantially Complete Containment – Example Analysis of a Reference Container, CNWRA 94-003, 1994.

142)            Seitz, R. and J.C. Walton, Modeling Approaches for Concrete Barriers Used in Low-Level Waste Disposal, NUREG/CR-6070, EGG-2701, 1993.

143)            Â Sridhar, N., J.C. Walton, G.A. Cragnolino, and P.K. Nair, Engineered Barrier System Performance Assessment Codes, (EBSPAC) Progress Report - October 1, 1992 Through September 25, 1993, Center for Nuclear Waste Regulatory Analyses, San Antonio, Texas, 1993.

144)            Â Walton, J.C., N. Sridhar, G. Cragnolino, and P. Nair, Analysis of Waste Package Environment as Related to Initiation and Propagation of Localized Corrosion, in (editors: D. Alexander, R. Baker, R. Kokout, and J. Marek), Proceedings of the 1993 International Conference on Nuclear Waste Management and Environmental Remediation, Vol. 1, p. 247-252, 1993.

145)            Â Walton, J. C., Effects of Evaporation and Solute Concentration on Presence and Composition of Water in and Around the Waste Package at Yucca Mountain, Waste Management, Vol. 13, pp. 293-301, 1993.

146)            Â Seitz, R. R., J. C. Walton, C. A. Dicke, and J. R. Cook, Near-Field Performance Assessment for the Saltstone Disposal Facility, Mat. Res. Soc. Symp. Proc. Vol. 294, pp. 731-736, 1993.

147)            Â Smith, R. W. and J. C. Walton, The Role of Oxygen Diffusion in the Release of Technetium from Reducing Cementitious Waste Forms, Mat. Res. Soc. Symp. Proc. Vol. 294, pp. 247-253, 1993.

148)            Â Sagar, B., R. B. Codell, J. C. Walton, and R. W. Janetzke, SOTEC: A Source Term Code for High-Level Nuclear Waste Geologic Repositories, User’s Manual: Version 1.0, CNWRA 92-009, Center for Nuclear Waste Regulatory Analyses, San Antonio, Texas, 1992.

149)            Â Walton, J. C. and S. K. Kalandros, Mariana - A Simple Chemical Equilibrium Module, CNWRA 92-020, 1992.

150)            Â Walton, J. C. and S. K. Kalandros, Twitch - A Model for Transient Diffusion, Electromigration, and Chemical Reaction in One Dimension, CNWRA 92-019, 1992.

151)            Seitz, R. R., J. C. Walton, and C. A. Dicke, Performance Assessment Approach for Modeling Flow and Transport Through Cracked Concrete Waste Forms, Second Engineering Technology Conference on Waste Management and Environmental Restoration, April 9-11, 1992, San Juan, Puerto Rico, pp. 469-478, 1992.

152)            Walton, J. C., Performance of Intact and Partially Degraded Concrete Barriers in Limiting Mass Transport, NUREG/CR-5445, June, 1992.

153)            Andrews, G.F., J. Walton, R. Larsen, R. Shimskey, S.G. Hansen, and F. S. Colwell. “The Design of In-situ Bioremediation.” Proceedings of the International Topical Meeting on Nuclear and Hazardous Waste Management, Spectrum ‘92, American Nuclear Society, pp. 1024-1028, August 23-27, 1992

154)            Walton, J. C., Performance of Monolithic Concrete Waste Forms, Waste Management ‘92, University of Arizona, pp. 1453-1457, 1992.

155)            Â Walton, J.C., and R. W. Smith, Discussion of “Thermodynamic Framework for Degradation of Polycyclic Aromatic Hydrocarbons in the Subsurface,” Ground Water, Vol, 30, No. 4, pp. 624-625, 1992.

156)            Walton, J. C. and R. R. Seitz, Hydraulic Performance of Cracked Concrete Containers, Proceedings of the Topical Meeting on Nuclear Waste Packaging, Focus ‘91, American Nuclear Society, p. 300-306, 1991.

157)            Â Walton, J. C. and R. R. Seitz, Fluid Flow Through Fractures in Below Ground Concrete Vaults, Waste Management, Vol. 12 pp. 179-187, 1992.

158)            Â Walton, J. C., Fluid Flow and Placement of Concrete Vaults in the Saturated or Unsaturated Zone, Waste Management, Vol. 11, p. 3-10, 1991.

159)            Walton, J. C. and R. R. Seitz, Performance of Intact and Partially Degraded Concrete Barriers in Limiting Fluid Flow, NUREG/CR-5614, 1991.

160)            Â Smith, R. W. and J. C. Walton, The Effects of Calcite Solid Solution Formation on the Transient Release of Radionuclides from Concrete Barriers, Mat. Res. Soc. Symp. Proc., Vol. 212, p. 403-409, 1991.

161)            Â Rawson, S. A., J. C. Walton, and R. G. Baca, Migration of Actinides from a Transuranic Waste Disposal Site in the Vadose Zone, Radiochemica Acta, 52/53, 477-486, 1991.

162)            Â Walton, J. C., Corrosion Cells: An Important Factor in Localized Waste Package Geochemistry?, Nuclear Technology, Vol. 94, p. 114-123, 1991.

163)            Walton, J. C., R. G. Baca, J. B. Sisson, A. J. Sondrup, and S. O. Magnuson, Application of Computer Simulation Models to Design Large-Scale Soil Venting and Bioremediation Systems, in Proceedings, Symposium on Soil Venting, April 29-May1, 1991, Houston, TX, D. DiGiulio, project officer, U.S. EPA Report EPA/600/R-92/174, 1992, p. 91.

164)            Walton, J. C. and R. W. Smith, Calcite Solid Solution Formation and Carbonation Effects on the Radionuclide Release from Concrete Waste Forms, Waste Management 91', University of Arizona, p. 343-349, 1991.

165)            Walton, J.C., Mathematical Models of Waste Isolation Performance, Ph.D. Thesis, University of Idaho, 1991.

166)            Walton, J. C., and L. E. Plansky, Evaluation of Concrete Barrier Performance in Different Geochemical Environments, Spectrum '90, Nuclear and Hazardous Waste Management International Topical Meeting, 1990.

167)            Walton, J. C., Hydrologic Considerations for Placement and Design of Disposal Facilities, Presented at: US DOE Low-Level Waste Management Conference, Chicago, IL, August 28-29, 1990.
Reported in The Radioactive Exchange, p. 12, September 18, 1990.

168)            Â Walton, J. C., Leakage Rates Through Flaws in Membrane Liners - Discussion, ASCE Journal of Environmental Engineering, Vol. 116, No. 5, p. 1004-1006, 1990.

169)            Walton, J. C., L. E. Plansky, and R. W. Smith, Models for Estimation of Service Life of Concrete Barriers in Low-Level Radioactive Waste Disposal, NUREG/CR-5542, 1990.

170)            Andrews, G., F. Colwell, and J. Walton, A Rational Design Procedure for In-Situ Bioremediation, presented at: Conference on Hazardous Waste Research, Kansas State Univ., Manhattan, KS, May 21-22, 1990.

171)            Â Walton, J. C. and B. Sagar, Aspects of Fluid Flow Through Small Flaws in Membrane Liners, Environmental Science and Technology, Vol. 24, No. 6, p. 920-924, 1990.
Summarized in “Ground Water in the News”, Ground Water, p. 838, Sept.-Oct., 1990.
Summarized in The Groundwater Newsletter, Vol. 19, No. 11, p. 5, 1990.

172)            Â Walton, J. C., Mathematical Modeling of Mass Transport and Chemical Reaction in Crevice and Pitting Corrosion, Corrosion Science, Vol. 30, No. 8/9, p. 915-928, 1990.

173)            Walton, J. C., R. G. Baca, J. B. Sisson, and T. R. Wood, Application of Soil Venting at a Large Scale: A Data and Modeling Analysis, in: Fourth National Outdoor Action Conference on Aquifer Restoration, Ground Water Monitoring, and Geophysical Methods, National Water Well Association, Dublin, Ohio, p. 619-632, 1990.

174)            Â Walton, J. C., Theoretical Modeling of Crevice and Pitting Corrosion Processes in Relation to Corrosion of Radioactive Waste Containers, Mat. Res. Soc. Symp. Proc., Vol. 176, p. 509 - 516, 1990.

175)            Baca, R. G., J. C. Walton, and J. B. Sisson, Fluids Modeling for Waste Management, presented at: 1990 annual Symposium on Engineering Geology & Geotechnical Engineering, Pocatello, Idaho, April 4-6, 1990.

176)            Walton, J. C., Influence of Coupled Processes on Waste Package Geochemistry, Proceedings of the Topical Meeting on Nuclear Waste Isolation in the Unsaturated Zone Focus 89', American Nuclear Society, La Grange Park, Illinois, p. 3 - 9, 1990.

177)            Â Walton, J. C., and M. D. Otis, Concrete Barrier Performance in Radioactive Waste Disposal in the Unsaturated Zone, Mat. Res. Soc. Symp. Proc., Vol. 176, p. 711 - 717, 1990.

178)            Sisson, J. B., R. G. Baca, J. C. Walton, and R. C. Arnett, Monitoring Plan for the Vapor Vacuum Extraction Demonstration, EG&G Idaho, EGG-WM-8856, 1990.

179)            Rawson, S. A., J. C. Walton, and R. G. Baca, Modeling Potential Migration of Petroleum Hydrocarbons from a Mixed-Waste Disposal Site in the Vadose Zone, in: Petroleum Hydrocarbons and Organic Chemicals in Groundwater: Prevention, Detection, and Restoration, National Water Well Association, Dublin, Ohio, p. 357 - 371, 1989.

180)            Walton, J. C., and M. D. Otis, Performance of Concrete Barriers in Radioactive Waste Disposal in the Unsaturated Zone, in: Fractal Aspects of Materials - 1989, Mat. Res. Soc. Symp. Proc., Pittsburgh, Pennsylvania, p. 91-94, 1989.

181)            Rawson, S. A., J. C., Walton, and R. G. Baca, Geochemical Control on Migration of Actinides from a Transuranic Waste Disposal Site in the Vadose Zone, Presented at: Second International Conference on Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, sponsored by Lawrence Livermore National Laboratory, Monterey, California, November 1989.

182)            Â Walton, J. C., Letter to the Editor, Waste Management, Vol. 9, pp. 195-198, 1989.

183)            Walton, J. C., R. G. Baca, and T. L. Rasmussen, Flow and Transport of Radionuclides in Unsaturated Fractured Basalt, in: Post, R.G., editor, Proceedings of the Symposium on Waste Management '89, University of Arizona, Tucson, Arizona, p. 775-780, 1989.

184)            Baca, R. G., J. C. Walton, S. O. Magnuson, and R. R. Piscitella, Modeling Contaminant Migration from a Mixed Waste Disposal Site: Studies of Controlling Factors and Processes, Presented at: American Nuclear Society Annual Meeting, Atlanta, Georgia, June, 1989. This paper received the Best Paper Award for the conference.

185)            Walton, J. C., R. G. Baca, and M. A. Lintner, Analysis of Organic Contaminant Release and Migration from the INEL Radioactive Waste Management Complex: Past, Present, and Future, Presented at: Idaho Academy of Science, 31st Annual Symposium, Idaho Falls, April, 1989.

186)            Baca, R. G., J. C. Walton, and M. A. Lintner, Use of Computer Simulation for Evaluating Remedial Actions for Organic Vapor Problems, Presented at: Geoprocessing and Surveying Conference, Boise, Idaho, March, 1989.

187)            Â Walton, J. C., A. S. Rood, R. G. Baca, and M. D. Otis, Model for Estimation of Chlorinated Solvent Release from Waste Disposal Sites, Journal of Hazardous Materials, Vol. 21, No. 1, p. 14-34, 1989.

188)            Rawson, S. A. and J. C. Walton, Potential Significance of Texaco Regal Oil to Contaminant Migration at the Subsurface Disposal Area: A Progress Report, EGG-ER-8706, 1989.

189)            Baca, R. G., J. C. Walton, and A. S. Rood, Computer Simulation Study of Contaminant Migration through the Subsurface Environment, Presented at: Second Annual INEL Computing Symposium, Idaho Falls, Idaho, 1988.

190)            Â Walton, J. C., Mathematical Modeling Of Large-Scale Nonuniform Corrosion: Coupling of Corrosion, Transport, and Geochemical Processes in Nuclear Waste Isolation, Nuclear and Chemical Waste Management, Vol. 8, No. 2, p. 143-156, 1988.

191)            Baca, R. G., J. C. Walton, A. S. Rood, and M. D. Otis, Organic Contaminant Release From a Mixed Waste Disposal Site: A Computer Simulation Study of Transport Through the Vadose Zone and Site Remediation, Proceedings of the Tenth Annual DOE Low-Level Waste Management Forum, Denver, CO, CONF-880839-Ses. II, p. 113-125, 1988.

192)            Baca, R. G., J. C. Walton, A. S. Rood, and S. M. Burns, Modeling of Organic Constituents at the Idaho National Engineering Laboratory Waste Management Complex, Presented at: American Chemical Society, Northwest Regional Meeting, July, 1988.

193)            Walton, J. C., Mathematical Modeling of Galvanic Corrosion Cells: Coupling of Corrosion and Geochemical Processes in Nuclear Waste Isolation, M.S. Thesis, University of Washington, 1988.

194)            Baca, R. G. and J. C. Walton, Preliminary Conceptual Models of Contaminant Migration at the RWMC, EG&G Idaho Report #EGG-WM-8023, March, 1988.

195)            Â Walton, J. C. and B. Sagar, Modeling Performance of Steel Containers in High Level Waste Repository Environments: Implications for Waste Isolation, Radioactive Waste Management and the Nuclear Fuel Cycle, Vol. 9, No. 4, p. 323 - 347, 1988.

196)            Walton, J. C., M. S. Bensky, M. E. Mease, and T. J. Bander, Sensitivity of Radionuclide Transport in Groundwater to Source and Site Characteristics, in Post, R.G., Editor, Proceedings of the Symposium on Waste Management '88, University of Arizona, Tucson, Arizona, p. 269 - 276, 1988.

197)            Dwyer, J. R., J. C. Walton, W. E. Greenberg, and R. Clark, Evaluation of Municipal Solid Waste Landfill Cover Designs, EPA/600/S2-86/110, (Order No. PB 88-171 327/AS), Apr., 1988.

198)            Walton, J. C., and B. Sagar, Mathematical Modeling of Copper Container Corrosion: The Transport Limited Approach, in Post, R.G., editor, Proceedings of the Symposium on Waste Management '88, University of Arizona, Tucson, Arizona, p. 711 - 717, 1988.

199)            Â Walton, J. C. and B. Sagar, A Corrosion Model for Nuclear Waste Containers, Mat. Res. Soc. Symp. Proc., Vol. 84, p. 271 - 282, 1987.

200)            Walton, J. C., Quantitative Measures of Risk from Nuclear Safety Analysis, Presented at: American Nuclear Society, Regional Meeting, Denver, Colorado, May, 1985.

201)            Walton, J. C., Redox Equilibria in a Fresh Water Lake, M.S. Thesis, University of Virginia, 1981.