The dredged contaminated sediment are considered as waste and landfilled. Use as public work material (filling, noise protection slope, landscape mound) is considered. The environmental impact must be assessed, and in particular the emission of persistent organic pollutants (POP) in percolating water. The assessment of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) is problematic since their concentration in water in equilibrium with the sediment is below the limit of quantification of routine water analysis. This work describes a laboratory method for evaluation of hydrophobic POPs concentration in water by passive sampling, and a non-linear partition coefficient model between the sediment solid phase and the aqueous phase.