In the past decades, environmental scientists, economists and physicists have been juggling critical issues within environmental strategies and environmental management styles in order to find a feasible medium between limited resources, long term demands and objectives, and interest groups. In the search for best management alternatives, practice has undergone a pendulum swing between stages that can be characterised as frontier economics, radical environmentalism, resource management/allocation, selective environmentalism and sustainable environmental management. The next stage of management must answer such questions as: Can there be a global - uniform environmental strategy?', or Based on their characteristics, can different issues, different regions and different applications have unique environmental strategies?' Based on this premise, the next stage of management may be identified as risk based sustainable environmental management. The goal of this style will be the risk based, long term, harmonious management of economic resources and environmental preservation for health, safety and prosperity of sustainable populations. When evaluation of risk or risk based ranking of management alternatives enter the picture as part of the overall puzzle, then social policy, ethics and health issues assume a very important role in the management strategy. Economic incentives and environmental constraints have to be considered harmoniously, the main emphasis being placed on protection and preservation of human health and the long term sustaining of populations.

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Preface. List of Invited Lecturers. Sorption and Retardation of Organic Contaminants in Subsurface Systems: Effects on Transport and Fate; W.J. Weber, et al. Theoretical Assessment and Experimental Validation of Models for Contaminant Transport Processes in Groundwater; V.A. Mironenko, V.G. Rumynin. Stochastic Modeling of Contaminant Transport in Field-Scale Heterogeneous Soils; M.L. Kavvas, et al. Higher-Order Effects on Flow and Transport in Randomly Heterogeneous Porous Media; K.-C. Hsu, et al. Projection Methods for the Finite Element Solution of the Dual-Porosity Model in Variably Saturated Porous Media; G. Gamolati, et al. A Transient Green's Function Flow and Particle Tracking Model to Quantify a Coupled River-Aquifer System: Application to the Assessment of Possible Groundwater Contamination from a Floridan Industrial River; M. Koch, H.M. Cekirge. Newton-Type Linearization and Line Search Methods for Unsaturated Flow Models; C. Paniconi, M. Putti. Development of Theoretical and Technical Basis for Tracer Tests in Aquifers; V.G. Rumynin, V.A. Mironenko. Monitoring of Leakage in Subsurface Injection of Liquid Industrial Wastes; C.B. Avci. Study of Groundwater Contamination by Radioactive Waste Filtration from Storage Basin; S.P. Pozdinakov. Application of Artificial Geochemical Barriers for Groundwater Quality Monitoring; V. Alexeev, G. Communar. Mathematical Models of Contaminant Transport in Stratified Media; G. Communar. In Situ Treatment of Groundwater: Metal-Enhanced Degradation of Chlorinated Organic Contaminants; R.W. Gillham. Spreading and Recovery of LNAPLS in Groundwater; Y. Corapcioglu, et al. Optimal Design of Capture Zones in Aquifer Remediation; M.M. Aral, et al. A Mixed Integer Programming Model for Optimal Groundwater Pollution Plume Interception and Treatment; F. Misirli, H. Yazicigil. Genetic Algorithms in Search of Groundwater Pollution Sources; M.M. Aral, J. Guan. The Role of Diffusion and the Modeling of its Impact on Groundwater Quality; R.K. Rowe. Waste Containment Systems for Pollution Control. Part I: Application of Geosynthetics; J.-P. Gourc. Waste Containment Systems for Pollution Control. Part II: Hydraulic Design and Performance; R. Bonaparte, J.P. Giroud. A Screening Model for the Assessment of Leachate Collection Efficiency and Groundwater Pollution Potential at Landfill Sites; K. Ünlü, S. Aksakal. The Role of Precipitation in Groundwater Pollution; R.G. Dzhamalov, V.L. Zlobina. Evaluation of Remedial Systems And Strategies; P.C. Lucia. The Use of Immobilized Antibody Fragments to Detect and Remove Organic Pollutants in the Environment; W.J. Harris. Analysis of Ground-Water Remediation During a Pesticide Application; R. Tykva. Panel Sessions. Index.