Lucila Candela is professor at the Department of Geotechnical Engineering andGeoscience-UPC (Barcelona, Spain). Her research topics mainly address the nature andfate of contaminants in the subsurface, laboratory process studies on contaminant transportin porous media, and groundwater hydrology.Iñaki Vadillo is researcher and lecturer at the Department of Geology, University ofMalaga (Spain). He is investigating the understanding of hydrochemical processes ofcontaminants in aquifers (Nitrate pollution, landfills, isotope application in groundwaterpollution studies).Francisco Javier Elorza is professor at the Department of Applied Mathematics in theMadrid School of Mines – UPM (Madrid, Spain). His research topics mainly addressthe numerical simulation of the nature and fate of contaminants in the surface and thesubsurface, stochastic modelling of environmental problems (i.e. transport in porous andfracture geological media) and the simulation of coupled processes in porous media.