Following the task 2.2., significant parameters will be mapped at site scale using “Geographical Information System” (GIS) and spatial analyses methods (e.g., interpolation method as kriging). Then, it will be possible to spatially map metal contents,
leaching or bioavailability potential of slags. This mapping of polluted zones will be crossed with other environmental variables in order to define site vulnerabilities and risks. A particular attention will be brought to the water and pollutants fluxes at low flow and high flow periods. Spatial groundwater vulnerability and risk will be defined taking into account vadose zone thickness, slag thickness, hydraulic gradient, hydraulic conductivity, flow direction, slag water retention (data from the PHYSAFIMM project). Spatial river vulnerability and risk will be defined by characterizing groundwater/surface water interactions (e.g., flow direction, water flow) with GIS simplified model. Another data (set out also from the PHYSAFIMM program), that cannot be spatialized, will be used to complete the diagnosis (e.g., air emission, wind, rainfall or river floods). This site vulnerability diagnosis at local scale will also be integrated in the WP6 global “Life-Cycle Assessment” (LCA).