This project deals with ‘Sustainable Methods and Technologies for Remediation’. It is an inter-sectoral partnership involving environmental biologists, chemists, physico-chemists and field practitioners. It aims at overcoming current limits in terms of efficiency, cost, sustainability and feasibility for the in situ regeneration of unsaturated zones contaminated with petroleum hydrocarbons through the development and the assessment of surfactant foams. It aims at: - using the promoting properties of these foams to solve problems for contaminants and reactants transport throughout heterogeneous or low accessibility zones (soils with high permeability contrasts or located below building foundations and inside underground buildings) to deliver more homogeneously and within the overall space some active matter (oxidants, micro-organisms, nutrients) in order to ensure an effective contaminant degradation; - modelling properties for matter transport and transfer of those complex fluids, from soil pore to field scale and the numerical simulation of degradation kinetics; - testing this technology at the pilot-scale in a contaminated site and to perform a benefits/costs/risks assessment compared to established remediation approaches.