Welcoming Remarks / James R. Elder -- Groundwater Ecology: An EPA Perspective / Robert Perciasepe -- What Can We Expect From Groundwater Ecologists? / Dan L. Danielopol -- The Role of Forests in Cleaning Nitrogen From Ground Water / N. P. Akhmetieva -- Spatial and Temporal Variation in Methane Distribution at the Ground Water/Surface Water Interface in Headwater Catchments / Michelle A. Baker, Clifford N. Dahm, H. Maurice Valett, John A. Morrice, Kevin S. Henry, Michael E. Campana and Gregory J. Wroblicky -- Chemical Composition and Variability of the Waters of the Edwards Plateau, Central Texas / Alan W. Groeger and John J. Gustafson -- Nitrogen Dynamics Along Parafluvial Flowpaths: Importance to the Stream Ecosystem / Robert M. Holmes, Stuart G. Fisher and Nancy B. Grimm -- Measuring Dissolved Oxygen in Simple and Multi-Level Wells / Peter Pospisil, Dan L. Danielopol and Jorge E. Dreher -- Organic Carbon Resources and the Payoff-Risk Relationship in Cave Ecosystems / Arthur V. Brown, W. Kevin Pierson and Kristine B. Brown -- Comparison of Water Chemistry in an Artificial System and in Coastal Underwater Mexican Caves / Diane E. Kallmeyer and Jerry H. Carpenter -- The Activity of Oligochaetes in Relation to Their Ecological Role in Slow Filtration Columns / Peter Torreiter, Pimon Pitaksintorn-Watanamahart and Dan L. Danielopol -- An Ecological Comparison of Two Anchialine Caves in Cuba With Emphasis on Water Chemistry / Jill Yager, Robert B. Spokane, Jeffrey E. Bozanic, Dennis W. Williams and Evelio Balado -- Aquifer Storage Recovery, Myrtle Beach, South Carolina / Joffre E. Castro -- System Analysis Nijmegen: Optimization of Groundwater Extraction in Relation to Water Quality and the Natural Environment / Mark H. Jalink and Aaldrik Kap -- Natural Reduction of Microscopic Particulates in an Alluvial Aquifer / William D. Gollnitz, Jennifer L. Clancy and Stephen C. Garner -- Microbial Activity in Saprolite Aquifers Overlying Two Different Types of Metamorphic Bedrock, South Carolina, USA / James E. Landmeyer, Francis H. Chapelle, Paul M. Bradley and Peter A. Stone -- Protists From a Sewage-Contaminated Aquifer on Cape Cod, Massachusetts, U.S.A. / Gianfranco Novarino, Alan Warren, Nancy E. Kinner and Ronald W. Harvey -- Use of Neural Networks for Hydraulic Conductivity Determination in Unsaturated Soil / Molly M. Gribb and Gil W. Gribb -- Regeneration of Wet Dune Slacks in the South-Western Delta of the Netherlands: HYFA, a Useful Tool to Predict Future Evolution / Tjeerd Willem Hobma, Andre de Hamer and Anton Bakker -- Efficient Local Refinement Schemes for Finite Difference Groundwater Simulation Models / M. Sun, C. Zheng and D. Tian -- Simulation of Stream-Groundwater Exchange and Near-Stream Flow Paths of Two First-Order Mountain Streams Using MODFLOW / Gregory J. Wroblicky, Michael E. Campana, Clifford N. Dahm, H. Maurice Valett, John A. Morrice, Kevin S. Henry and Michelle A. Baker -- Microbial Transformations of TNT and DNT in Contaminated Soils and Aquifer Materials at Weldon Spring, Missouri / Paul M. Bradley, Francis H. Chapelle and James E. Landmeyer -- Engineering Solutions for Removing Dissolved PCE From a Low Permeable Aquifer / T. Gregg Gibbons, David G. Nichols and Ralph W. Tyree -- Investigation of Selenium Losses in Canals Used for Conveyance of Subsurface Agricultural Drainage Through the Grassland Water District, California / Nigel W. T. Quinn, John Clyde and Rohit Salve -- Sampling for Pesticides in South Georgia's Shallow Aquifers / Sandra Jo Robertson -- Effect of Carbon-Nitrogen Ratios on Growth Kinetics of Acinetobacter johnsonii Metabolizing Phenol in Liquid and Saturated Sand / Ute Rossner, Blythe L. Hoyle and Kate M. Scow -- Pesticides in Runoff and Shallow Ground Water From Upland Corn Production in North Mississippi, USA / S. Smith, Jr., R. F. Cullum and J. D. Schreiber -- Use of a Natural Isotope to Measure Surface Water Contamination of Ground Water / Bryan R. Swistock and David R. DeWalle -- Geomicrobial Profile Through the Hyporheic Zone of a Historic Mining Flood Plain / Bruce Wielinga, Shawn Benner, Christine Brick, Johnnie Moore and James Gannon -- Influence of the Epikarst Zone on Groundwater Flow in a Mantled Karst Aquifer / Henry E. Julian and Steven C. Young -- Remote Sensing and Neotectonic Analyses of Possible Groundwater Flow Paths in Karst / Neven Kresic, Arthur B. Busbey and Ken M. Morgan -- Initial Use of Potential Ecological Indicators to Detect Subsurface Drainage in Wetlands of the Southeastern Coastal Plain, U.S.A. / Sydney T. Bacchus -- Groundwater/River Interaction in the Elbe River Basin in Saxony / Thomas Grischek, Wolfgang Nestler, Jorg Dehnert and Peter Neitzel -- Ground Water-Surface Water Exchange in Two Headwater Streams / K. S. Henry, H. M. Valett, J. A. Morrice, C. N. Dahm, G. J. Wroblicky, M. A. Santistevan and M. E. Campana -- Chemoautotrophic Production and Respiration in the Hyporheic Zone of a Sonoran Desert Stream / Jeremy B. Jones, Jr., Robert M. Holmes, Stuart G. Fisher and Nancy B. Grimm -- A Barrier Island Aquifer Response to Hurricane Emily, Hatteras Island, North Carolina / Amy S. Morgan, James D. Gregory and David G. Evans -- Groundwater Impacts From an Unlined Constructed Wetland System Receiving Waste From a Swine Operation / Richard P. Reaves, Paul J. DuBowy, Don D. Jones and Alan L. Sutton -- Estimation of the Spring Available Soil Water Storage / Nadezhda A. Shumova -- Experimental Flooding of a Riparian Forest: Restoration of Ecosystem Functioning / Francelia S. Lieurance, H. Maurice Valett, Clifford S. Crawford and Manuel C. Molles, Jr. -- Ecological Aspects of Groundwater Management: Short Comments From the European Experience / Dan L. Danielopol -- Groundwater Resource Management / Rodney S. DeHan.