TREATMENT OF A POLLUTED WATER TABLE BY STRIPPING (83) Following the discovery of a lead-free fuel leak near a service station located in urban environment, ORTEC Generale de Depollution studied, designed and set up an operation to treat the water table and recover the polluting hydrocarbons. An initial emergency diagnostic including drilling, permeability tests and pumping tests was carried out to determine the configuration of the pumping network and the treatment to be implement. In this relatively complex geological context and due to the fact that private irrigation wells were affected, ORTEC Generale de Depollution installed in emergency a recuperation network consisting of three pumps equipped with all-fluid pumps. The water table is treated by a mobile stripping unit operating continuously by phase separation and volatilisation of organic polluting substances (BTEX). The polluted air is recovered and treated using an active carbon filter. In one year, the BTEX concentrations were reduced by 95%.