Nilson Guiguer, Ph.D. is the author of several groundwater models, including FLOWPATH, FLONET/TRANS and Visual MODFLOW. He received his Ph.D. in hydrogeology from the University of Waterloo where he also taught the graduate level course "Mathematical Modeling of Groundwater Systems" during his teaching and post-doctoral fellowship. He has also been involved in delivering professional short courses around the world from the United States to Spain, Australia and Japan. As president of Waterloo Hydrogeologic, he is actively involved in many consulting projects dealing with groundwater contamination and protection, and has extensive experience in advising municipalities and government agencies in Canada, the USA and South America on wellhead protection delineation methods.


Robert W. Cleary received his Ph.D. degree in Chemical Engineering. He was a Professor of Civil Engineering at Princeton University and a Professor of Geosciences at the Institute of Geosciences of the University of Sao Paulo in Sao Paulo, Brazil from 1972 to 1991. During this time he taught mathematical modeling to graduate students and directed their research on the application of modeling to remediation design, wellhead protection, impact analyses of hazardous waste sites, and water supply studies. He is currently a groundwater consultant and an adjunct professor in the groundwater program at the University of Waterloo. He is the principal technical adviser for the Visual MODFLOW software package. His research interests and practical experience include all aspects of groundwater contamination, remediation hydrology, modeling, site characterization and remediation strategies. Considered one of the outstanding teachers in the field, he originated and is the principal lecturer in the National Ground Water Association's `IBM PC Applications' course, Visual MODFLOW courses, and the Princeton Groundwater's `Groundwater Pollution and Hydrology' course. Those who have participated in the Princeton Groundwater short course will attest to his dynamic, clear, and organized teaching style. In addition to numerous technical articles and reports, he as authored several book chapters dealing with groundwater hydrology and modeling.


Daniel Gomes, M.Sc. has 18 years of experience in many areas of hydrogeological consulting including water management, mine dewatering, risk assessment, design and implementation of remedial systems for groundwater and soils, and groundwater flow and contaminant transport modeling . Mr. Gomes received his M.Sc. in Geology and Hydrogeology from the University of São Paulo in Brazil. He is fluent in written and oral Spanish, Portuguese, and English and has provided environmental consultation and project management services in several projects worldwide, including over 50 projects for Fortune 500 multinational companies. Mr. Gomes was recently invited by the World Bank Groundwater Management Advisory Group (GW-MATE) to co-author a manual on groundwater quality protection. The International Atomic Energy Agency and the World Health Organization also recognize Mr. Gomes' expertise and have retained him as an expert advisor and instructor on groundwater modeling. Mr. Gomes coordinates WHI's international consulting projects, including projects in the USA, Argentina, Brazil, Chile, Colombia, Venezuela, Peru, Mexico, Uruguay, China, Thailand, Vietnam and Pakistan.


Thomas Franz, M.A.Sc., is a founding principal of Waterloo Hydrogeologic Inc., and Franz Environmental Ltd. in Ontario, Canada. He has conducted numerous modeling studies for impact assessments on landfill sites, feasibility studies for soil and ground water remediation under Superfund, and ground water protection schemes. He holds graduate degrees in civil engineering from the University of Stuttgart, Germany; and in hydrogeology from the University of Waterloo. He has authored several ground water models including Visual MODFLOW, FLOWPATH, FLOTRANS, and AIRFLOW/SVE.


D.J. Miln Harvey, Ph.D., P.Eng. is a Hydrogeologist with Waterloo Hydrogeologic Inc, and the Manager of the Training Division. Dr. Harvey spent 5 years in the Consulting Services Division where his current work was focused on the integration of groundwater flow models with GIS data management to assess regional groundwater protection strategies through WHPA delineation and Groundwater Vulnerability Assessment. His work also involved the assessment of groundwater contaminant impacts through fate and transport modeling, and the potential for Natural Attenuation of these contaminants. This is an extension of his Ph.D. research at the University of Waterloo, which focused on risk-based decision making for the delineation of Wellhead Protection Areas for municipal supply wells at risk to contamination. Prior to his graduate work, Dr. Harvey worked as a civil engineer on the design, inspection and operation of solid waste landfills in Canada. He has extensive experience in the use of models for groundwater analysis and prediction, as well as their use as an integral component in the decision making process. He continues his interest in teaching as a lecturer for Groundwater Modeling Courses offered by Waterloo Hydrogeologic.




Troy Schultz is Vice President of BJAAM Environmental Incorporated. Mr. Schultz holds a Bachelors degree in Geology from Kent State University and has 15 years of experience in the environmental industry. He specializes in the development of site-specific clean-up standards and has delivered numerous courses to government agencies and industries on the use and implementation of risk-based approaches to corrective actions (e.g., OhioEPA, Puerto Rico EQB, Argentina and Brazil). The American Society for Testing and Material (ASTM) has designated Mr. Schultz as a Sanctioned Risk Based Corrective Actions (RBCA) Trainer. He also provides expert witness reports and testimony regarding remediation costs and risk assessment on behalf of companies such as Shell Oil and BP. Mr. Schultz serves on several state rules and technical committees and has past experience as a Risk Assessor for the State of Ohio.


Lynn Spence is an independent consultant with expertise in chemical risk assessments and fate and transport modeling. Lynn has 17 years experience in environmental engineering, risk assessments, remedial investigations, litigation support and contaminant transport modeling. She is the developer of BP's Risk Integrated Software for Clean-ups (RISC). Lynn teaches short courses on risk assessment and fate and transport modeling for regulatory agencies. is an independent consultant with expertise in chemical risk assessments and fate and transport modeling. Lynn has 17 years experience in environmental engineering, risk assessments, remedial investigations, litigation support and contaminant transport modeling. She is the developer of BP's Risk Integrated Software for Clean-ups (RISC). Lynn teaches short courses on risk assessment and fate and transport modeling for regulatory agencies.

Polo Velasco, M.Sc. is one of the Instructors for the Risk Assessment course. He has more than 38 years of consulting engineering experience in geotechnical and environmental engineering. He has a wide range of experience in environmental site assessment, in the remediation of contaminated soil and groundwater, using a variety of techniques such as: landfarming, soil venting, hydrocarbon removal using recovery wells and trenches, waste stabilization / solidification, and in the closure of hazardous waste sites and of petroleum contaminated sites using risk assessment to establish soil and groundwater clean up levels.

During the last 21 years he worked with the British Petroleum (BP) in the US as a Senior Geoenvironmental Advisor and was responsible for the technical implementation of the ASTM Risk Based Corrective Action (RBCA) procedure at over 600 Gasoline Retail Stations in the US. Other responsibilities while working for BP included the training of Consultants in the practical application of fate and transport models used in the RBCA process. Some of the models included in the training of the Consultants were: the Johnson&Ettinger volatilization to indoor, all the models presented in the ASTM E1739-95" Standard Guide for Risk-Based Corrective Action Applied at Petroleum-Release Sites '' , and groundwater screening models, such as BIOSCREEN. He was also responsible for the technical interaction with Regulatory Agencies. He developed the methodology used by the Bureau of Underground Storage Tanks (BUSTR) in Ohio to evaluate the soil leaching to groundwater pathway.