QUANTIFICATION ANDMONITORING OF CONTAMINANT MASS FLUXES IN HETEROGENEOUS SUBSURFACE MEDIA Objectives

1) Single-well tracer technique FVPDM Temporal and spatial variability of groundwater contaminantplumes are so important that they can not be investigated byconventional approaches (essentially based on pollutant concentrations monitored in wells). Characterization and risk assessment concepts should rather be based on contaminant flux measurements which are able to evaluate effectively and quantitatively the risk of contaminant dispersion. This requires (1) the interception of the entire groundwater flow section of the pollutant plume with a control panel; (2) the ability to measure and calculate accurately groundwater fluxes and contaminant concentrations and (3) the repetition of the measurement to bring out the spatial and the temporal variation of contaminant fluxes. The aim of this research project is to develop an approach and operational devices for the measurement and monitoring of pollutant fluxes and their variability with time and space, at the scale of contaminated site. This approach is based on the combination of the “Finite Volume Point Dilution Method ” with passive sampling techniques, integrated at the scale of a control panel. 3) Integrated PS-FVPDM to contaminant mass flux monitoring on control pane