Paul Davis – Resume – March 2016

Address 736 Main Street, Suite 5 Durango, Colorado 81301 Email: p_davis@EnviroLogicInc.com Cell Phone: 505-688-6053 Fax: 505-286-8438

Experience November 2012 – Present United Kingdom Committee on Radioactive Waste Management (CoRWM) Member

Mr. Davis has led the CoRWM Safety-Case Development Subgroup while participating in the National Geologic Screening and RWM Development SubGroups as well as fully participating in all joint CoRWM endeavors.

============================================== July 2000 - Present EnviroLogic, Inc.

Owner / Senior Scientist

Mr. Davis provides consultation in:

geohydrology,

ground-water flow and transport modeling,

uncertainty and sensitivity analysis,

risk and performance assessment,

safety assessment and safety case development,

environmental restoration,

radioactive waste management,

and the technical basis for regulatory compliance.

Recent EnviroLogic Inc. Activities

Mr. Davis presented two professional papers at the National Ground Water Association’s Southwestern Meeting in Albuquerque, New Mexico on February 24, 2016, one on the use of Fourier Transforms to extract Evapotranspiration from Stream Flow and Well Records and the other an investigation on the Potential for Increased Recharge from Forest Thinning.

Mr. Davis is supporting the New Mexico Environmental Law Center in their effort to accelerate the clean up a large (4-24 million gallon) fuel spill into groundwater.

Mr. Davis wrote a report for the UK’s Low-Level Radioactive Waste Site Operator detailing a set of alternatives for the development and documentation of their next formal safety case as well as recommendations for the development of a “live” safety case to use in support of management decisions.

As an expert witness, Mr. Davis is investigating the transport of hazardous chemicals from the San Juan Generating Station (a coal-fired electrical power plant) and the San Juan Mine to the surface and ground waters that contribute to the San Juan River which empties into the Colorado River. In support for a local resident, the Clean Air Task Force, Earth Justice, and the Sierra Club, Mr. Davis has provided technical support and provided the structure for a settlement reached between the Sierra Club and BHP/PNM which will stop surface and groundwater pollution from leaving BHP/PNM. Mr. Davis now oversees the technical aspects of the implementation of the settlement for the Sierra Club.

Mr. Davis and LANL recently published a technique for quantifying the uncertainty associated with stable isotope analysis developed by EnviroLogic Inc. The technique is used to aid in the determination of sources of contamination and can and has been used in a wide variety of fields including the quantification of sources of food to Manakin birds in the Amazon.

Currently Mr. Davis is a consultant to the IAEA supporting the development and implementation of the IAEA’s PRISMA project which focuses on providing examples of the content of a safety case for low-level radioactive waste disposal sites.

In the spring of 2015, Mr. Davis participated in an expert mission to Pakistan designed to provide oversight and guidance to the development of a low-level radioactive waste site.

Mr. Davis has supported and is supporting a number of New Mexico water interests including the San Pedro Creek Homeowner’s Association’s protest of a very large groundwater development project along the Turquoise Trail (New Mexico Highway 14). This support includes a geohydrologic evaluation of the region and the review and critique of the project’s characterization and groundwater modeling efforts, as well as testimony in related NM State Engineer hearings.

In 2013, Mr. Davis co-authored a report with the Dutch Nuclear Research Group comparing and evaluating international safety-case structures and recommending a structure for a safety case for a future GDF in Holland.

Past EnviroLogic Inc. Activities

Mr. Davis has long history with and support of the International Atomic Energy Agency’s (IAEA) radioactive waste disposal programs including NSARS, ISAM, ASAM, PRISM, and now PRISMA. In addition, Mr. Davis has been called on as an expert in performance assessment for IAEA missions in China and South Africa and has co-authored IAEA safety guides, technical documents, the IAEA glossary for terms used in radioactive waste disposal, the disposal of long-lived low level radioactive waste, and the disposal of sealed sources.

Mr. Davis has supported Los Alamos National Laboratories (LANL) Environmental Programs in the development of decision support methods designed to optimize data collection, monitoring, the choice of remedial alternatives, and the long-term stewardship of environmental restoration sites. This work includes the evaluation of the sufficiency of existing data, the optimization of additional data collection, the estimation of the current nature and extent of contamination, optimal monitoring network design, and the simulation of potential future migration of LANL contaminants to on and off site locations and/or receptors.

Mr. Davis has consulted with the Nuclear Research Group (NRG) in Holland and supports their involvement in the Dutch OPERA project, specifically supporting NRG’s recommendations for the structure of a safety case and safety assessment for the geologic disposal of high-level radioactive waste.

Mr. Davis led the EnviroLogic Inc. team in developing and maintaining a groundwater flow model of New Mexico’s San Juan Basin and the modification and maintenance of a groundwater flow model of the Espanola Basin for the US Bureau of Indian Affairs and the US Department of Justice. These models were built in support of Indian water rights hearings with the New Mexico State Engineer’s Office. Groundwater characterization based on water chemistry, surface water studies, evapotranspiration studies, and aquifer tests all performed by EnviroLogic Inc. supported the groundwater flow modeling.

In late May and early June of 2001, the Society for Risk Analysis held the Starr/Garrick Symposium on Quantitative Risk Assessment. This special invitation-only symposium of “senior and distinguished leaders of government agencies, academia, and industry” was designed to “develop a path forward for the advancement of risk sciences to the benefit of society.” In addition to participating in the symposium, Mr. Davis chaired a session on the use of risk assessment in public policy and decision-making.

Mr. Davis served on the Idaho National Engineering and Environmental Laboratory Ad Hoc Review Committee on Waste Area 7. The committee was charged with assessing the technical defensibility of the Waste Area 7 program. In addition, to providing reviews on the geoscience, modeling, risk assessment, and environmental restoration aspects of the program, Mr. Davis provided reviews and recommendations for the overall integration of the program.

Mr. Davis has supported efforts by Laguna Pueblo to find adequate sources of water for a proposed development on the eastern portion of Pueblo lands. The work includes support for the Pueblo’s Environmental Assessment of potential impacts of the proposed development.

Mr. Davis has advised the US Nuclear Commission’s (NRC) Advisory Committee on Nuclear Waste (ACNW) on technical issues related to the disposal of high-level radioactive waste at Yucca Mountain, Nevada. Issues addressed by Mr. Davis include groundwater flow and transport and overall system performance.

Mr. Davis was a member of the United States review team for the United Kingdom’s Department of Environment (UKDOE). The review focused on the UKDOE performance assessment efforts as they relate to the disposal of low- and intermediate-level radioactive waste in England.

Mr. Davis has located and evaluated a number of wells in New Mexico including the well for the town of Madrid, NM and as an interested citizen, Mr. Davis supported the Estancia Basin Water Planning Committee in its development of the first approved regional water plan under the NM Interstate Stream Commission’s regional water planning program.

1990 – 2000 Sandia National Laboratories

Department Manager

As a department manager, Mr. Davis was responsible for personnel management, technical and programmatic leadership, and technical contributions to a wide variety of projects. Over his tenure as a manager, Mr. Davis supervised groups of staff and contractors, which ranged in size from approximately 15 to 40. Associated duties included: hiring; career development; counseling; mentoring; merit review; contract management; and assuring compliance of all staff and programs with Sandia Laboratories and Department of Energy environmental health and safety and security regulations and policies. Program and project management duties included: program development and marketing; customer relations; technical oversight, leadership, and integration; financial responsibility for a budget which ranged in size from $2M to $26M and technical and programmatic presentations to customers, conferences, and the public. Specific programs, projects, and assignments included the following (listed by customer): Sandia National Laboratories (SNL) Program Development Program Supported: Water Resources International Programs

Mr. Davis led the SNL program development effort in water resources. Activities included the definition of a unique and value-adding role for Sandia in water resources; the development of a lab-wide initiative extending beyond water resources to water treatment and surety of water supply systems; the development of collaboration with other government agencies, universities, and private agencies; and the drafting of proposals to obtain internal and external funding. As part of this program development, effort Mr. Davis helped design and implement a Vital Issues Panel in water resources for stakeholders, government officials, academia, and business interests in Puerto Rico and initiated a similar process in Costa Rica. Dynamic simulations of the Middle Rio Grande Basin and the Estancia Basin, New Mexico were also developed under this initiative. Finally, Mr. Davis chaired the sub-committee on modeling for the Estancia Basin Water Planning Committee.

Mr. Davis led Sandia’s efforts to identify collaborators and potential customers for environmental work in the Former Soviet Union (FSU). Mr. Davis developed numerous contacts within the FSU resulting Memorandum of Understanding between Sandia, the Russian Federation for Basic Research, Moscow State University, the Radium Institute of St. Petersburg, AtomProect,

and the governments of the Buryiat and Kamchatka regions, the Limnology Institute in Irkutusk, the Natural Land Use Institute in Ulan-Ude, and the Volcanology Institute and Geotechnical Sciences Institute of Petropavlovfk. Under Mr. Davis’ direction, Sandia Labs collaborated with the Egyptian Atomic Energy Agency for the development of new programs and the exchange of scientists and information. This collaboration has resulted in a number of joint proposals including: a regional center of excellence in radioactive waste management; a decision support system for agriculture; groundwater flow modeling; and the assessment of risks associated with various options of sewage treatment. Mr. Davis also hosted a number of International Atomic Energy Agency (IAEA) fellows as visiting scientists at Sandia Labs.

Mr. Davis represented Sandia Labs in meetings in Czech republic to develop a proposal between SNL and Czech private and governmental companies. The proposal is based on using the Sandia Environmental Decision Support System (SEDSS) in addressing decommissioning and decontamination and environmental restoration issues in Czech Republic (1998). Nuclear Regulatory Commission (NRC) Programs Supported: Decontamination and Decommissioning

(D&D) and Low-Level Waste (LLW) Programs.

The goal of these programs was to develop tools, techniques, and methods to assess the potential impact of the release and migration of radionuclides through the environment to individuals or populations. In addition, support was provided to the NRC in the development of regulations and regulatory guidance documents. These efforts resulted in the development, testing, and application of computer codes used to simulate the migration and fate of radionuclides in the environment, dose and risk to humans, and methods for quantifying and propagating uncertainty. This work also produced a risk-based approach for minimizing the cost and efforts associated with site characterization, engineered barriers, and remediation. These efforts also provided dose calculations in support of the NRC D&D and LLW regulations, technical guidance documents, and training and support to the NRC staff, states, compacts, private companies, and the public. In addition, dose assessments were performed for a number of D&D and LLW sites.

Mr. Davis’ provided the technical direction, oversight, and integration of these programs. In addition, Mr. Davis developed the approach to relating risk calculations to decisions regarding further site characterization, engineering, and/or remediation. Mr. Davis’ also participated in the development of: the NRC’s Branch Technical Position on LLW performance assessment, including drafting their responses to public comments; the D&D decision methodology documented in NUREG 1549; and the regulatory guidance on dose modeling contained in NUREG 5512. Mr. Davis also represented the NRC in their involvement in the International Atomic Energy Agency’s (IAEA) in "The Safety Assessment of Near-Surface Radioactive Waste Disposal Facilities (NSARS)" and International Safety Assessment Methodologies (ISAM) programs. These programs focused on understanding, testing, and standardizing the methods and procedures used to assess the safety of near-surface radioactive waste disposal facilities. National Science Foundation (NSF) Program Supported: Joint US/Russia Collaboration

Mr. Davis was the lead US investigator for a Russian/US team that prepared and submitted a joint proposal to the NSF’s Civilian Research and Development Foundation (CRDF). The proposal was entitled “Development of Optimal Approaches to Site Characterization for Estimating Plume Migration, Risk Assessment, and Monitoring Well Network Design Using Data from Two Russian Sites.” The project was awarded by CRDF in 1997. The two Russian sites were the Tomsk site (one of the largest sites of underground injection of liquid radioactive waste), and the Tambov site (the largest site of underground injection of hazardous waste). The US team provided project management; support in the methodology development; technical direction for incorporating a probabilistic approach into risk and dose estimation; and communication with the US governmental agencies (NRC, EPA, and DOE) potentially interested in the project applications. This project was extended beyond the NSF scope by funding provided by the Waste Isolation Pilot Plant (WIPP) international effort. As a result, a Web page for the Tomsk site was developed and a real-time monitoring system was established at the Dimitrovograd site in support of the WIPP transparency effort. US Department of Energy (DOE) Program Supported: Greater Confinement Disposal (GCD) Program The purpose of the GCD program was to assess compliance of a waste disposal facility at the Nevada Test Site (NTS) with EPA regulations. The project involved the development and application of a performance assessment methodology to the

assess whether or not an NTS facility that had buried transuranic waste in large diameter boreholes drilled 120 feet into alluvium could comply with the same environmental regulations that applied to the WIPP facility. The GCD team was able to demonstrate that even without engineered barriers or waste packages, this site complies with the stringent WIPP standards. In addition, the project was completed for about one third of the proposed cost and at a fraction of the cost of equivalent WIPP analyses. Mr. Davis participated in the development and marketing of the GCD program and at different times was the project manager, provided technical oversight, performed regulatory interpretation and strategy development, developed technical approaches to many tasks, and contributed to report writing. US Department of Energy (DOE) Program Supported: Waste Isolation Pilot Plant (WIPP) Mr. Davis was responsible for integrating the Waste Isolation Pilot Plant (WIPP) experimental program with the WIPP performance assessment program into the common goal of achieving compliance with the environmental regulations governing the disposal of transuranic waste (40CFR191). The development and application of the WIPP System Prioritization Method (SPM) by Mr. Davis provided a quantitative link between experiments, repository design, waste acceptance criteria, performance assessment, and regulatory compliance. The SPM combined these factors with their associated costs and schedules to provide the US Department of Energy (DOE) with an optimal path to compliance that included the concerns of the stakeholders and regulators. Following the development of the SPM, Mr. Davis presented the SPM to the WIPP stakeholders, the Environmental Protection Agency (EPA), and the National Academy of Sciences (NAS) WIPP panel and received their endorsement for this markedly different approach to achieving regulatory compliance and managing the WIPP program. Also in this assignment, Mr. Davis was responsible for the Sandia-EPA and Sandia-stakeholder interfaces. This work involved numerous presentations to the EPA, the WIPP stakeholders, the National Academy of Sciences WIPP panel, the NRC’s Advisory Committee on Nuclear Waste, and Congress’ Nuclear Waste Technical Review Board. US Department of Energy (DOE) Program Supported: Sandia Labs Environmental Restoration

Program Mr. Davis was responsible for managing Sandia’s Environmental Restoration; Spill Prevention, Control, and Countermeasures; Environmental Monitoring; Air Pollution Management;

Ground-Water Monitoring; Building Decontamination and Demolition; Air Monitoring; and National Environmental Policy Act (NEPA) programs. As part of the duties of this assignment, Mr. Davis developed the infrastructure for this new department including a budget and purchasing system, a records management system, and a GIS database system. As Environmental Restoration (ER) Program Manager, Mr. Davis provided technical and programmatic oversight resulting in successful internalization of the program. Under Mr. Davis’ direction the program changed from a program managed and performed by outside contractors to a program performed by Sandia staff and on-site contractors. Mr. Davis was also responsible for the implementation of a detailed project management system for cost/time estimation and tracking; meeting all legal and technical requirements for the program; successful persuasion of the DOE and New Mexico Environmental Department (NMED) to accept a more technically sound step-by-step approach to remedial investigation; implementation of a community relations plan; and initiation of a new-site identification program. Mr. Davis led the Environmental Restoration response to the DOE Tiger Team effort, provided interviews, scheduled staff members for interviews, obtained requested information, responded to draft findings, and drafted action plans for resolving Tiger Team findings, in addition to serving as a Sandia ER Tiger Team counterpart. Finally, Mr. Davis was responsible for negotiations between EPA and Sandia on the corrective action provisions of Sandia’s Part B RCRA permit and for negotiations between the NMED and Sandia on the closure of the Chemical Waste Landfill, an interim status facility. US Environmental Protection Agency (EPA), NRC, and DOE Program Supported: The Sandia Environmental Decision Support

System (SEDSS) SEDSS was conceived by Mr. Davis to provide a platform for negotiation between site owners and regulators that combines probabilistic techniques with physically-based models, geographic information systems, geostatistics, and decision analysis in a user-friendly computational environment. The intent of SEDSS is for the site owner and the regulator to apply their own assumptions and beliefs to the problem at hand and be guaranteed that decisions are constrained by site data and known geological processes overlain by quantitative uncertainty analysis. SEDSS also provides a direct quantitative link between site characterization and risk answering the difficult questions of what data to collect, how much to collect, and where to collect the data. After conception of the idea, Mr. Davis sought and received financial and regulatory support from the EPA Superfund program, the NRC, and the DOE’s Uranium Mill Tailings program. Mr. Davis left Sandia Labs when SEDSS was still under development.

1982-1990 Sandia National Laboratories

Member of the Technical Staff

The primary function of this position was to develop a methodology for the US Nuclear Regulatory Commission to use in assessing the long-term safety of potential high-level radioactive waste disposal sites. This methodology consisted of tools and techniques to perform the following: 1) scenario development and screening; 2) consequence analysis focusing on releases from waste packages and engineered systems, ground-water flow and transport; 3) pathways and health effects modeling; and 4) uncertainty and sensitivity analyses. Mr. Davis’ role evolved from specialization in ground-water flow and transport analysis to coupled heat and ground-water flow modeling to uncertainty and sensitivity analysis to computer code verification and model validation to overall responsibility for the further development and application of the performance assessment methodology. Under Mr. Davis’ direction the methodology was extended to address the unique problems associated with the potential disposal of high-level radioactive waste in unsaturated fractured rock (Yucca Mountain).

Additionally, Mr. Davis was responsible for expanding the methodology beyond the treatment of parameter uncertainty to address conceptual model uncertainties and was responsible for the development and application of geostatistical tools used to address uncertainties associated with spatial variability. During the development and application of the methodology for the Basalt Waste Isolation Project (BWIP), Mr. Davis was a member of NRC’s BWIP hydrology review team and developed and applied a three-dimensional ground-water flow model to the BWIP regional hydrology. Mr. Davis led the technical effort in support of NRC’s involvement in the HYDROCOIN international effort in ground-water flow model verification, validation, and uncertainty analyses. Mr. Davis’ involvement in HYDROCOIN included the formulation and definition of three of the HYDROCOIN test cases, model development and application for a majority of the test cases, and participation in the international team tasked with writing the final report. Mr. Davis also supported NRC’s initial involvement in the international ground-water transport validation exercise - INTRAVAL. INTRAVAL participation included the development and application of a validation strategy for groundwater flow and transport models and its application to several of the test cases. While a member of the technical staff, Mr. Davis developed a probabilistic approach to assessing the adequacy of the ground-water monitoring network around Sandia’s chemical waste landfill.

1978 – 1982 US Geological Survey, Water Resources Division Hydrogeologist Mr. Davis supported field hydrologic testing for the Waste Isolation Project Plant (WIPP), a program which included well drilling and logging, aquifer testing in zones of low permeability, and regional ground-water flow analysis. Mr. Davis also developed a numerical three-dimensional steady-state model of the Roswell Artesian Basin ground-water flow system. This work entailed regional geohydrologic analysis, model development and calibration, and the application of geostatistical techniques to assess the spatial variability of transmissivity and hydraulic heads within the basin. As a supplement to this effort, Mr. Davis developed pre- and post- processors to allow users to directly input model data from digitizers and to graph model output. While at the USGS, Mr. Davis performed aquifer testing associated with mine reclamation and served as the New Mexico District’s expert in aquifer testing.

University of New Mexico - Department of Geology Instructor While working for the USGS, Mr. Davis taught a graduate level class entitled ‘Quantitative Hydrogeology’. Subjects covered ranged from the theory of ground-water flow to aquifer test analysis to numerical modeling of ground-water flow systems.

1976 Continental Oil Company, Mineral Exploration Division Geologist Mr. Davis was a member of a team investigating potential molybdenum, gold, and silver deposits in the Ortiz Mountains of New Mexico. The work involved geologic mapping, sample gathering and analysis, and geomagnetic surveys.

1970 – 1972 US Army Helicopter Door Gunner, Crew Chief, Flight Engineer - Vietnam Airport Crash and Rescue Team – Ft. Lewis, Washington.

Other Significant Activities

Member of the US DOE’s External Peer Review Panel for Idaho National Engineering and Environmental Laboratories’ Waste Area 7 Assessment Invited participant and session chair in the Society for Risk Assessment’s Special Symposium on the Future of Quantitative Risk Assessment Invited Speaker at the University of Puerto Rico’s Conference on Ethics in Engineering Member of United States DOE delegation on ground-water flow and transport - Russia Technical Panel Chair - Physical Characterization, Methods, and Modeling - US DOE TIE Workshop. International Atomic Energy Agency (IAEA) China Program - Expert Services in Performance Assessment Member of the OECD’s Nuclear Energy Agency Review Team for the Dutch High-Level Waste Program

Member of DOE’s Nuclear Engineering Research Review Panel EPA Science Advisory Board on Ground-Water Monitoring Member of Sandia Laboratories’ Division 6000 Diversity Council

Education New Mexico Institute of Mining and Technology Master of Science- Hydrology, 1978 University of New Mexico Bachelors of Science- Geology, 1976 Short Courses after MS Degree USGS Finite-Difference Modeling Two-Dimensional Finite Difference Modeling Three-Dimensional Finite Difference Modeling Geophysical Logging Techniques Technical Writing and Editing LBL Unsaturated Zone Modeling using the TOUGH Code University of Waterloo Contaminant Transport

UCLA Project Management and System Engineering Cost Estimation for Decision Makers Capitalizing on Workplace Diversity Westinghouse/DOE/Sandia Quality Assurance Sandia Labs Vectorized Iterative Methods for Partial Differential Equations Social Styles Building Market Focused Organizations Covey Leadership Center Seven Habits of Highly Effective People EPA OSHA 40 Hour Health and Safety Training NRC SWIFT II Workshop Executive Enterprises Environmental Regulations Technical Training Programs US Army CH-47 Helicopter Maintenance Washington State Department of Natural Resources Forest Management

Awards HYDROCOIN Technical Assistance - Sandia Labs Exceptional Contribution Award Greater Confinement Disposal Program- Sandia Labs Individual Performance Award Ground-Water Monitoring Strategy - Sandia Labs Individual Performance Award Development and Marketing of the WIPP System Prioritization - Sandia Labs Award for Excellence

References Available Upon Request

Interests Photography, guitar, gardening

Publications

LEAD AUTHOR

Davis, P., Pozdniakov, S., Fogleman, B., Rives, D., and D. Davenport, 2016, Forest Thinning to Increase Groundwater Recharge, Presented at the 2016 National Ground Water Association Conference - Hydrology and Water Quality in the Southwest, Albuquerque, New Mexico.

Davis, P., Pozdniakov, S., Syme, J. and B. Fogleman, 2016, Use of Groundwater and Surface Water Fluctuations to Estimate Evapotranspiration, Presented at the 2016 National Ground Water Association Conference - Hydrology and Water Quality in the Southwest, Albuquerque, New Mexico.

Davis, p., Syme, J., Heikoop, J, Fessenden-Rahn, J., Perkins, G., Newman, B., Chrystal, A. and S. Hagerty, Quantifying uncertainty in stable isotope mixing models, 2015, J. Geophys. Res. Biogeosci., 120, 903–923, doi:10.1002/2014JG002839.

Davis, P., 2011, Calculating Risk and Living with the Consequences, Invited Paper - Australasian Science – Issues, RISK, Volume 97, December 2011

Davis, P. And D. Rives, 2011, Addressing Sampling Issues Associated With Land Release, Consultant’s Report to Los Alamos National Laboratories.

Davis, P., Rives, D., and S.P. Pozdniakov, 2010; Decision Support Process Developed in Support of Soil Gas Monitoring at LANL MDAs. Consultant’s report to Los Alamos National Laboratories.

Davis, P., and J. Symes, 2010, Development and Testing of Mixing Models for Stable Isotope Analysis; Consultant’s Report to Los Alamos National Laboratories

Davis, P., Pozdniakov, S. P., Kuvaev, Fogleman, W., and D. Rives, 2010; Transient Model Calibration of the San Juan Basin Groundwater Model. Consultant’s Report to the US Department of Justice and the Bureau of Indian Affairs. Davis, P., 2009; PRISM (International inter comparison and harmonization project on Practical Illustration and Use of the Safety Case Concept in the Management of Near-Surface Disposal); presented at the International Workshop Provisional Programme, Demonstrating the safety and Licensing of Radioactive Waste Disposal, 14 December 2009, Cape Town, South Africa Davis, P., Kuveav, A., Pozdniakov, S., and I. Pozdniakov, 2009; On the Relation between Geologic and Hydrologic Units – Four Examples; Presented at the 2009 Meeting of the Espanola Technical Advisory Group Meeting.

Davis, P., 2005; Risk-Based Decision Support for the Evaluation of Remedial Alternatives, Characterization, and Monitoring, - Obstacles to Implementation; Invited Talk at the 2005 Theis Conference; Sedona, Arizona.

Davis, P., Pozdniakov, S. P., Kuvaev, and W. Fogleman, (2004), Steady-State Groundwater Flow Model of the San Juan Basin, New Mexico. Report to the US Department of Justice and the Bureau of Indian Affairs.

Davis, P., 2004; Risk-Based Decision Support for Safety Assessment, Characterization, and Monitoring; Presented to the International Atomic Energy’s ASAM Group on February 9, 2004, Vienna, Austria.

Davis, P., Beyeler, W., and D. Moran, 2000; Evaluation of Sources of Water for the Eastern Lands of the Laguna Pueblo; Sandia National Laboratories Internal Report.

Davis, P., Feeney, T., Hareland, W., Kalinina, E., and J. Cochran, 1999; Proposed Response To Public Comments On The Nuclear /Regulatory Commission’s Branch Technical Position on Performance Assessment; Draft sent to NRC for review.

Davis, P. and others*, 1997; Draft Safety Guide on Safety Assessment for Predisposal Waste Management; International Atomic Energy Agency Safety Series No. 111-G-2.6. (IAEA documents do not have listed authors. This report was developed by a group of consultants including Mr. Davis).

Davis, P., Feeney, T., Kalinina E., Ross, F., 1997; Lessons Learned from Participation in the International Atomic Energy Agency’s Near-Surface Radioactive Waste Disposal Safety Assessment Reliability Study - NSARS, prepared for US NRC, NRC FIN A1764.

Davis, P.A., Ross, F., Kozak, M.W., Kalinina, E.A., and Feeney, T.A., 1995; NSARS Test Case 2c Summary Report; Report to the 4th NSARS Research Coordination Meeting, Keswick, UK, June, 1995.

Davis, P.A., N. E. Olague, Johnson, V.L., Dickman, P.T., Neill, L.J., 1993, Greater Confinement Disposal of High Activity and Special Case Wastes at the Nevada Test Site: A Unified Migration Assessment Approach, Sandia National Laboratories, Albuquerque, New Mexico, SAND93-0640C.

Davis, P. A., Olague, N. E., and Goodrich, M. T., 1992; Application of a Validation Strategy to Darcy's Experiment, Advances in Water Resources, V. 15

Davis, P. and Olague, N.E., 1991, Treatment of Uncertainties in Total System Safety Assessments, in Probabilistic Safety Assessment Volume 1, p649-652, Elsevier Publisher.

Davis, P. A., Gallegos, D. P., Hake, T. M., Olague, N. E., Price, L. L., Piepho, M. G., Goodrich, M. T., and Lee, C. E., 1991; Comparison of Two Risk Assessment Methodologies for High-Level Waste Disposal in Unsaturated Media, Sandia National Laboratories, Albuquerque, New Mexico; SAND90-0574 Davis, P. A., Olague, N. E., and M. T. Goodrich, 1991, Approaches for the Validation of Models Used for Performance Assessment of High-Level Nuclear Waste Repositories; NUREG/CR-5537 and SAND90-1575 Davis, P. A., and M. T. Goodrich, 1991, A Proposed Strategy for the Validation of Ground-Water Flow and Transport Models in Validation of Geosphere Flow and Transport Models, GEOVAL-1990, OECD, Paris, France Davis, P. A., Price, L. L., Wahi, K. K., Goodrich, M. T., Gallegos, D. P., Bonano, E. J., and Guzowski, R. V., 1990; Components of an Overall Performance Assessment Methodology; NUREG/CR-5256 and SAND88-3020 Davis, P. A., Bonano, E.J., Wahi, K.K., and L.L. Price, 1990. Uncertainties Associated with the Performance Assessment of High-Level Radioactive Waste Repositories, NUREG/CR-5211. Davis, P., and N.M. Coleman, 1989, Hydrogeologic Evaluation of a Ground-water Barrier at Hanford, Washington, Transactions of the American Geophysical Union, V.70, No.29, July 18, 1989. Davis, P., Beyeler, W. E., Logsdon, M., Coleman, N., and K. Brinster, 1989, Numerical Modeling of Ground-Water Flow Systems in the Vicinity of the Reference Repository Location, Hanford Site, Washington, NUREG/CR-5089 and SAND88-0141 Davis, P. A., Beyeler, W. E., McCartin, T. J., Miller, R., and K. Brinster, 1988, NRC Model Simulations in Support of the Hydrologic Code Intercomparison Study (HYDROCOIN), NUREG-1249, Vol. 1 Davis, P., and R. Miller, 1987, Goodness-of-Fit Measures for Regional Model Calibration, presented at the May 1987 American Geophysical Union Meeting, Baltimore, Md.

Davis, P., and W. Beyeler, 1987, Assessment of Particle Tracking Algorithms, presented at the May 1987 American Geophysical Union Meeting, Baltimore, Md. Davis, P. A., 1987; Validation of Performance Assessment Models used on High-Level Waste Disposal with Insights from the GEOVAL-87 Symposium, invited presentation to the Water Science Advisory Board of the National Academy of Sciences, Woods Hole, Massachusetts.

Davis, P. A., Hanson, R. H., and W. Beyeler, 1983; Documentation and User’s Manual for Program Grid; USGS Open File Report 83-4163. Davis, P., Wilcox, R., and G. W. Gross, 1979; Spring Characteristics of the Western Roswell Artesian Basin; New Mexico Inst. of Water Resources Research Report No. 116

CONTRIBUTOR

Grupa, J, and P. Davis, 2013, Report on the OPERA Safety Case Structure, Nuclear Research Group, OPERA-PU-NRG2111

Fair, J.M., Ryder, T. B., Loiselle, B.A., Blake, J.G., Larson, T.E., Davis, P.A., Syme, J., Perkins, G.B., and J.M. Heikoop, 2013, Estimates of dietary overlap for six species of Amazonian Manakin Birds using Stable Isotopes, Journal: GIEH: Isotopes in Environmental and Health Studies.

Hart, J., Wildenborg, T., Davis, P., and D. Alexander Becker, 2013, OSCAR - Definition of the OPERA Safety Case for Radioactive Waste Disposal in the Netherlands, Presented at the Nuclear Energy Agency’s 2nd International Safety Case Symposium, 7-9 October 2013, Paris, France.

Hart, J., Davis, P., Becker, D., Noseck, U., Hendriksen, l., Wildenborg, A., Winegram, M., 2012, OSCAR - Sub-task A: Evaluation of current state-of-the art on Safety Case methodologies, Nuclear Research Group, OPERA-CF-NRG211A.

Larson, T., Heikoop, J., Perkins, G., Longmire, P., Davis, P., Rearick, M., Fessenden, J., and A. Chrystal, in press; Differentiating Multiple Sources of Nitrate using Dual Isotope Systematics with Uncertainty Analysis; Chemical Geology. A. Chrystal, J. M. Heikoop, P. Davis, J. Syme, S. Hagerty, G. Perkins, T. E. Larson, P. Longmire, J. E., Fessenden, 2010, Probability distribution functions of delta15N and delta18O in groundwater nitrate to probabilistically solve complex mixing scenarios

Cystal, A., Davis, P., Syme, J., Heikoop, J., Fessenden-Rahn, J., Larson, T., Longmire, P., Perkins, G., Rearick, M., and S. Hagerty, 2010, Probabilistically Solving For Complex Groundwater Mixing Using Dual Isotopes Of Nitrate; Presented at the Fall 2010 American Geophysical Union Meeting. Kaztman, D., et. al.; 2007; Fate And Transport Modeling Report For Chromium Contamination From Sandia Canyon; Los Alamos National Laboratory; LA-UR-07-6018 Kaztman, D. et. al.; 2006; Mortandad Canyon Investigation Report; LAUR-06-6752 Hollis, D., Davis, P., Birdsell, K., Vesselinov, V., Newman, B., and C. Echohawk, 2005, Decision Analysis for Addressing Groundwater Contaminants from the Radioactive Liquid Waste Treatment Facility Released into Mortandad Canyon; Los Alamos National Laboratories: LA-UR-05-6397 Vesselinov, V., Birdsell, K., Davis, P., and D. Hollis, 2005; Risk-based decision Analysis for Groundwater Remediation and Monitoring: Uncertainty Assessment; Presented at MODELCARE 2005 Hollis, D. and P. Davis, 2005; Los Alamos National Laboratory’s Risk-Based Decision Analysis for Groundwater Remediation and Monitoring - Part 1, Uncertainty Management; Presented at MODELCARE 2005. Birdsell, K., Vesselinov, V., Davis, P., Hollis, D., Newman, B., and C. Echohawk, 2005; Analysis of Model Uncertainties to Support Risk-Based Decisions Regarding Groundwater Contamination; Presented at the 2005 American Geophysical Union Meeting. Birdsell, K., Vesselinov, V., Hollis, B., and P. Davis, 2005; Groundwater Pathways Analysis: Uncertainty Analysis of Contaminant Transport from Mortandad Canyon; Presented at the 2005 Meeting of the Espanola Basin Technical Advisory Group.

Shestakov V.M., Kuvaev A.A. Lekhov A.V Pozdniakov S. P. Rubalchenko. A I., Zubkov A.A. Davis P.A. and, Kalinina E.A, Flow and transport modeling of liquid radioactive waste injection using data from Siberian Chemical Plant Injection Site, Environmental Geology, Vol. 42 2-3 2002 pp.214-221.

Cochran, J., and others, 2000; Compliance Assessment Document for Transuranic Wastes in the Greater Confinement Disposal Boreholes at the Nevada Test Site, Volume 2 Performance Assessment, Sand Report.

Shestakov, V., Davis, P., Kuvaev, A., Lekhov, A., Pozdniakov, S., Rybalchenko, A., Zubkov, A., Kalinina, E., 1999; Development of Flow and Transport Models of Liquid Radioactive Waste Injection Using Data from Siberian Chemical Plant Injection Site. Proceedings of the Joint Russian-American Hydrogeology Seminar. Berkeley, USA, November 1999. Hareland, W., Beyeler W., Brosseau, D., Davis, P., Fogleman, W., Kalinina, E., 1999; Test of NUREG-1549, Decision Methods for Dose Assessment to Comply with Radiological Criteria for License Termination, Draft Letter Report prepared for US NRC. Beyeler, W., Brown, T., Hareland, W, Conrad, S., Olague, N., Brosseau, D., Kalinina, E., Gallegos, D., Davis, P., 1998; Review of Parameter Data for the NUREG/CR-5512 Residential Farmer Scenario and Probability Distributions for the DandD Parameter Analysis; Letter Report, prepared for US NRC. Rattan, D., Santucci, P., Davis, P., Hossain, S., Seitz R., Torres, C., Kalinina, E., 1996; Safety Assessment of Near Surface Radioactive Waste Disposal Facilities: Intercomparison Exercise Using Hydrogeological Data from a Real Site (Test Case 2); Second Report of NSARS, International Atomic Energy Agency, 1996. Gallegos, D.P., Webb, E.K., Davis, P. A., AND S.H. Conrad, 1996, A Probabilistic Environmental Decision Support Framework for Managing Risk and Resources, International Conference on Probabilistic Safety Assessment and Management, Crete (Greece), 24-28 Jun 1996 Zimmerman, D. A., Bonano, E. J., Davis, P. A., Harlan, C. P., and Chu, M. S. Y., 1992; Peer Review of the U.K. DOE Dry Run 3 Exercise (A Trial Probabilistic Risk Assessment of a Hypothetical Nuclear Waste Repository at Harwell, Oxfordshire), Sandia National Laboratories, Albuquerque, New Mexico; SAND92-1945 Kerl, F. A., Heger, A. S., Gallegos, D. P., and P. A. Davis, 1991; Methodology to Obtain Expert Information About the Conceptual Model Development Process Used for Performance Assessment of Waste Management Sites, American Nuclear Society Annual Winter Meeting, San Francisco, CA Zimmerman, D. A., Hanson, R. T. and P. A. Davis, 1991; A Comparison of Parameter Estimation and Sensitivity Analysis Techniques and Their Impact on the Uncertainty in Ground Water Flow Model Predictions NUREG/CR-5522 and SAND90-0128

Heger, A. S., Kerl, F. A., Gallegos, D. P., and P. A. Davis, 1991; Use of Probabilistic Networks in Quantification of Uncertainties in Development of Conceptual Models for Radioactive Waste Repositories, American Nuclear Society Annual Winter Meeting, San Francisco, CA Parsons, A.M. and P.A. Davis, 1991, A Proposed Methodology for Assessing Compliance with the RCRA Ground Water Monitoring Regulations, presented at the 1991 ASTM Symposium, San Diego, California. Kerl, F. A., Heger, A. S., Gallegos, D. P., and P. A. Davis, 1991, Use of Graphical Structures to Quantify and Propagate Uncertainty in Development of Conceptual Models, First Engineering Conference of Waste Management Technology, Technology Transfer, and Training, San Juan, Puerto Rico. Bonano, E. J., Davis, P. A., Bras, R. L., and P. K. Kitanidis, 1989, Methodology for Estimation Groundwater Travel Times at a Nuclear Waste Repository Using a Physically-based Geostatistical Approach, in Geostatistics Volume 2, Kluwer Academic Publishers Bonano, E. J., Davis, P. A., Shipers, L. R, Brinster, K. F., Beyeler, W. E., Updegraff, C. D., Shepard, E. R., Tilton, L. M., and K. K. Wahi, 1989, Demonstration of a Performance Assessment Methodology for High-Level Waste Disposal in Basalt Formations, NUREG/CR-4759 and SAND86-2325 Bonano, E. J., Davis, P. A., Bras, R. L., and P. K., Kitanidis, 1988; Methodology for Estimation of Ground-Water Travel Times at a Nuclear Waste Repository Using a Geostatistical Approach; SAND87-2226c, Sandia National Laboratories, Albuquerque, New Mexico, presented at the Third International Geostatistics Congress, Avignon, France, September 5-9, 1988. Bonano, E. J., and P. A. Davis, 1988; Demonstration of a Performance Assessment Methodology for Nuclear Waste Isolation in Basalt Formations, SAND86-2125c, Sandia National Laboratories, Albuquerque, New Mexico, presented at Waste management 88, Tucson, Arizona, February 28 - March 3, 1988. Bras, R. L., Kitanidis, P. K., Bonano, E. J., Davis, P. A., and L. M. Tilton, 1987; Ground-Water Travel Time Calculations Using Conditional Simulation Geostatistics, SAND87-0003A, Sandia National Laboratories, Albuquerque, New Mexico, presented at the Mathematical Geologist of the United States 1987 meeting on Emerging Concepts.

Nicolson, T. J., McCartin, T. J., Davis, P. A., and W. Beyeler, 1987, NRC Experiences in HYDROCOIN: An International Project for the Studying Ground-Water Flow Modeling Strategies, presented at the Waste Management 87 Conference, Tucson, Arizona. Cole, C. R., Nicolson, T. J., Davis, P. A., and T. J. McCartin, 1987; Lessons Learned from the HYDROCOIN Experience, presented at the GEOVAL-87 Symposium, Stockholm, Sweden. Bonano, E. J., Chu, M. S., Cranwell, R. M., and P. A. Davis, 1985; Development of Performance Assessment Methodology for Nuclear Waste Isolation in Geologic Media; Proc. Symposium of Groundwater Flow and Transport Modeling of Performance Assessment of Deep Geologic Disposal of Radioactive Waste, May 20-21, 1985, NUREG/CR-0079, PNL-SA-13796, Pacific Northwest Laboratory, Richland, Washington. Risser, D.W, Davis, P.A., Baldwin, J.A., and D. P. McAda, 1984. Jackpile-Paguate Uranium Mine, Pueblo of Laguna, West-Central New Mexico, U.S. Geological Survey Water-Resources Investigations Report 84-4255 Tien, P., Nimick, F. B., Muller, A. B., Davis, P. A., Guzowski, R. V., Duda, L. E., and R. L. Hunter, 1982; Repository Site Data and Information in Bedded Salt: Palo Duro Basin, Texas; NUREG/CR-3129 Dennehy, K. F., and P. Davis, 1981; Hydrologic Testing of Tight Zones in Southeastern New Mexico; Ground Water, V.19 No. 5. Mercer, J. W., Davis, P., Dennehy, K. F. and C. Geotz, 1981; Results of Hydrologic Tests and Water Chemistry Analyses, Wells H-4A, H-4B, and G-4C at the Proposed Waste Isolation Pilot Plant Site, Southern New Mexico; USGS WRI 81-36 Gross, G. W., Davis, P., and K. R. Rehfeldt, 1979; Paul Spring: An Investigation of Recharge in the Roswell (NM) Artesian Basin; New Mexico Inst. of Water Resources Research Report No. 113