Geocubed is a numerical and analytical simulation consulting and software development firm for groundwater and unsaturated (or vadose zone) fate and transport and flow. Learn more about GeoCubed. About Dr. Montazer

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Parviz Montazer, Ph. D., CEG, PG, CPG

About Dr. Montazer

Dr. Montazer is the Founder of GeoCubed and Multimedia Environmental Technology, Inc.  

Dr. Montazer has been the forefront of Nuclear Waste Disposal Hydrology with development of Conceptual Model of the Unsaturated Flow through Yucca Mountain in 1984.

Parviz Montazer

Key Qualifications



Years of Experience 25



     Ph.D. (Geological Engineering/Groundwater Hydrology) - Colorado School of Mines -1982

     M.S. (Geological Engineering/Groundwater Hydrology/Mining and Petroleum Eng.) - Colorado School of Mines - 1978



      Professional Geologist, CA, 5183, Certified Engineering Geologist, CA, 1652. Member American Institute of Professional Geologists (Certified PG by AIPG) and American Geophysical Union.


       Alternative Remedial Design Investigation/Feasibility Studies GIS application to Remedial Investigation Studies

      Computer simulation of Biodegradation and migration of VOC and radionuclides.

      Water and Wastewater Transport in Rivers

      Expert Witness and Legal Representation

      Contract Claim Administration

      Regulatory Agency Negotiations

Parviz Montazer, Ph.D., has over 25 years of experience in design, planning, and execution of environmental and remediation engineering and water resources. Dr. Montazer has been involved in numerous hazardous toxic radiological waste projects and has performed simulation of unexploded munitions and explosives impact on soil and groundwater. He has been involved in numerous soil and groundwater remediation projects, both in-situ and ex-situ in California, Colorado, Illinois, Indiana, Montana, Nevada, New Jersey, Texas, and Washington states. Dr. Montazer’s expertise includes simulation of all aspects of remediation ranging from data collection and pilot testing to design and implementation of full-scale systems. He has worked under regulatory requirements of CERCLA, RCRA, NWPA, and State Agency Led programs (DTSC, RWQCB).

Dr. Montazer has been active in projects ranging from deep drilling and sampling, database management and simulation of large nuclear sites, evaluation of remedial alternatives of hazardous waste Superfund sites, to investigations and remediation of typical gas station sites. Dr. Montazer has used innovative simulation techniques for estimation of migration of volatile organic compounds (VOC) in vadose zone and groundwater and has used these techniques to evaluate alternative remediation approaches of both soil and groundwater. The applications included soil vapor extraction systems, air sparging, in-situ bioremediation, and suitability of low-level and high level radioactive waste disposals. Contaminants addressed include petroleum hydrocarbons, volatile organic compounds, DNAPL, perchlorate, nitrates, explosives, hexavalent chromium, and radioactive isotopes. Dr. Montazer has presented by invitation to California RWQCB, DTSC, NWTRB, EPA, and has addressed the California Department of Public Health.

Dr. Montazer has performed analysis using The U.S. Army Corps of Engineers Waterway Experiment Station Hydraulic Evaluation of Landfill Performance (HELP) modeling of leachate percolation and collection systems and assisted in preparation of Subtitle D documents. He has used MULTIMED, VLEACH and many more sophisticated analytical and numerical models such as MODFLOW, T2VOC and TOUGH2 to analyze flow and transport of liquid and gases within the land fill body, through the underlying liner system (natural or artificial), and for landfill cap design. More that 70% of Dr. Montazer’s experience has been in arid and desert environments of California and Nevada.

Dr. Montazer has served private sector clientele, U.S. Federal, state, and county government agencies. Dr. Montazer has served as expert witness for major law firms and has been involved in several large claims.


Project Manager and/or Lead Role

Dr. Montazer managed GIS programming, data compilation, data analysis, computer model quality assurance, numerical modeling, and report preparation for a complex nuclear test site.  The site consists of over 500 wells and boreholes with geologic and hydrogeologic data as well as numerous subscale numerical models designed for flow and radionuclide transport characterization of the site. The complex geology of the site consists of fractured carbonate, granitic, and volcanic rocks of various ages as well as recent alluvial and colluvial sedimentary formations. Evaluated lateral boundary flux using MODFLOW2k within the Death Valley Regional Ground Water Flow system of U.S. Geological Survey. Evaluated data from 300 samples collected from 60 locations for colloid-facilitated transport properties of radionuclides. Compiled data and prepared report on dispersivity data for the region. Also, wrote a comprehensive report on hydrologic data available in Yucca Flat, Nevada Test Site.


Management Role

President of an environmental engineering firm which focused on the application of computer models and other quantitative methods to performance assessment, remedial design, and risk assessment studies as applied to hazardous and radioactive waste sites throughout the country.  Examples of projects are:

  • Conducted fate and transport modeling, prepared RI/FS reports, supervised field drilling and sampling, and developed an environmental database management for various sites in California, Indiana, and Nevada Site.
  • Developed a groundwater model using MODFLOW and MODFLOWP for the vicinity of Jet Propulsion Laboratory in Pasadena, California.
  • Developed a comprehensive database for geologic and chemicals of concern for the vicinity of Jet Propulsion Laboratory in Pasadena, California.
  • Conducted performance assessment for a laboratory facility contaminated with low-level waste in New Jersey using NRC approved codes and standards.
  • Developed a model to assess causes and timing of an underground petroleum hydrocarbon pipeline leak in San Diego.
  • Developed a ground-water model to encompass several large counties in Southern Nevada.
  • Developed a subsurface environmental trace-gas monitoring system at Yucca Mountain in Nevada Test Site (NTS).
  • Performed numerous gas and water permeability tests at NTS.
  • Designed and implemented an infiltration test system for fractured rocks in Prosser, Washington.
  • Developed a climatological and ventilation monitoring system in several tunnels and drifts in Yucca Mountain at NTS.
  • Managed a computer-modeling project to modify a multiphase non-isothermal computer numerical code (TOUGH2) to simulate interface between atmosphere and subsurface environment. The computer model was used to assess the performance of a low-level radioactive waste containment system at the Nevada Test Site.


Principal Hydrologic Scientist

Dr. Montazer managed the research and development of integrated environmental software, fate and transport analysis in support of health risk assessment, and ground-water modeling in support of remedial design.  Technical lead for research to select codes suitable for modeling three-dimensional, multi-phase, non-isothermal radionuclide flow and transport in arid environments.

Project manager and technical lead of a Feasibility Study involving the design of a ground-water recovery and treatment system at a site contaminated with arsenic and phosphorus using a finite-element groundwater flow and transport model (SUTRA).  Conducted field contaminant mobility and pumping tests to evaluate migration potential of arsenic.

Technical lead of a Fate and Transport study in support of a risk assessment for a decommissioned wood treatment facility containing soils contaminated with PCP, dioxins, furans, metals, and other carcinogenic hydrocarbons.  The project involved modeling aqueous- and sorbed-phase transport in local and regional surface water systems as well as vadose zone and saturated zone flow and transport using SESOIL.

Project Manager and/or Lead Role

Project manager for low-level radioactive waste disposal facility in California.  Reviewed license application and prepared sections of the document related to trench cover design, vadose zone monitoring, and ground-water characterization.


Prepared hydrologic section of an environmental impact report for a RI/FS for a plutonium-contaminated facility.  Conducted hydrologic studies in conjunction with development of alternative remediation plans to remove the plutonium-contaminated soil.

Evaluated site characterization and performance assessment modeling studies in support of a license application for a low-level radioactive waste disposal facility in Illinois.  The preparation of an agency-required safety analysis report was also included in this study.

Simulated fluid flow around shafts and seals in a potential high-level radioactive waste repository in domal salt using a finite-element, variably-saturated flow and transport code.

Principal Hydrologic Scientist

Dr. Montazer was the technical leader in the application of methods related to unsaturated zone hydrology, rock mechanics, radionuclide transport, and finite element and finite difference ground water modeling in fractured tuff. He also led the site characterization program that involved instrumentation and testing of the deep unsaturated zone at the Nevada Test Site.  In addition, he led surface water quality and quantity sampling programs and basin analysis for sites in Colorado and California.

He managed five research projects to provide information required for site characterization and license application for a potential high-level radioactive waste repository in unsaturated fractured tuff.  Supervised 17 permanent and about 40 contract employees conducting studies on geochemistry, near-surface phenomena and infiltration, deep percolation, code development, and simulation of two-phase flow through a thick unsaturated zone in fractured tuff.

Directed and collaborated on development of a finite element, variably saturated fluid flow and chemical transport code.

He developed a comprehensive research program to understand the flow of fluids through unsaturated fractured rocks.

He developed, oversaw, and implemented a drilling and instrumentation scheme to instrument the first deep (a 1,200-foot) borehole in unsaturated fractured tuff.  Drilling employed a unique and innovative technique using a special dual-string reverse-air vacuum system to minimize contamination; 33 intervals were instrumented with thermocouple psychrometers, heat-dissipation probes, pressure transducers, and gas sampling tubes.


Montazer, P., 2003, Preliminary Fate and Transport Modeling, Brown & Bryant Superfund Site, Arvin, California, Prepared for U.S. Army Corps of Engineers, Los Angeles District, Los Angeles, California, October 2002.

Montazer, P., 2002, A Conceptual Permanently-Ventilated Low-Temperature Repository Design and Preliminary Numerical Evaluations, Presented to NWTRB in Washington, DC, May 2002.

Montazer, P., 2002, Preliminary Evaluation of A Modified Conceptual Design of A Naturally-Ventilated Repository, Report, February 2002.

Montazer, P., 2001, Unsaturated Zone Studies at Yucca Mountain Region, A chapter in Five Year Annual Grant Report of Nye County to Department of Energy, June 2001.

Montazer, P., 2001, Investigations at ONC#1, NRG-4, ESF, and ECR: A chapter in Five Year Annual Grant Report of Nye County to Department of Energy, June 2001.

Montazer, P., 2001, Presentation to EPA Region 9 related to Fate and Transport Modeling of a Superfund Site, July 2002.

Montazer, P., 2000, Preliminary Numerical Model of the Amargosa Valley and Yucca Mountain Areas, Nye County, Nevada, June 2000.

Montazer, P., 1998, A-T2VOC, Implementation Of Atmospheric Interface Into T2voc With Large-Scale Preprocessor For Personal Computers, TOUGH workshop, Lawrence Berkeley Laboratory, Berkeley, California, March 1998.

Montazer, P., 1996, Risk-Based Decision Making In Environmental Applications and Efficient Fate And Transport Analysis With T2VOC, Presented at the Association of Ground Water Scientists and Engineers, Las Vegas, Nevada, December 1996.

Montazer, P., 1995, Air-TOUGH, A fully coupled atmospheric-subsurface interface model, International High Level Radioactive Waste, Las Vegas, Nevada, April, 1995.

Montazer, P., 1995, Three-dimensional Coupling of Atmosphere with Subsurface in Rough Terrain, Invited participant in TOUGH workshop, Lawrence Berkeley Laboratory, Berkeley, California, March, 1995.

Montazer, P., 1994, A-TOUGH, A computer code for simulation of atmospheric interface with fractured rocks, International High-Level Radioactive Waste, Las Vegas, Nevada, May 1994

Montazer, P., Weeks, E.P., Thamir, F., Hammermeister, D.P., Yard, S.N., and P.B. Hofrichter, 1988: Monitoring the Vadose Zone in Fractures Tuff:  Ground Water Monitoring Review, V. 8, Spring.

Montazer, P., 1986: Permeability of unsaturated fractured metamorphic rock near an underground opening: Battelle/ONWI Subcontract No. E512-04800, Topical Report.

Montazer, P., and W.E. Wilson, 1984: Conceptual hydrologic model of flow in the unsaturated zone, Yucca Mountain, Nevada:  U.S. Geological Survey, Water Resources Investigation Report 84-4345, 55 pp.