B.1-Assessment of quantity, quality and vulnerability SOIL AQUIFER TREATMENTS TO REMOVE PRIORITY ORGANIC POLLUTANTS IN THE LLOBREGAT RIVER AREA Maria Huerta a , Josep Solé a , Mercè Aceves a , Cristina Valhondo b , Marta Hernandez c , Martín Gullón a a Laboratori de l’Àrea Metropolitana de Barcelona (AMB).Direcció de Serveis del Cicle de l’Aigua. Carrer 62, 16-18, 08040-Barcelona, Spain. Email: maceves@amb.cat b UPC. c/Jordi Girona 18. 08034-Barcelona, Spain. Email: cvaqam@idaea.csic.es c Cetaqua Av.Diagonal 211. 08018-Barcelona, Spain. Email: mhernandezga@cetaqua.com Keywords: Managed Aquifer Recharge, Soil Aquifer Treatments, Prioritary Pollutants, Pesticides, PAHs, Triazines, The Barcelona Metropolitan Area is the most densely populated area of Catalonia (NE- Spain) with more than 3M inhabitants. As a typical Mediterranean region, it suffers from water scarcity problems due to long drought periods. The Llobregat River is the main source of water supply in this area. This river together with its aquifer has suffered from several damages during the last decades which had contributed to endanger a suitable ecological and hydrological status. Specifically, overexploitation of groundwater resources along with severe drought periods has caused the appearance of symptoms indicating the imbalance of this water balance. The river loses water and dries during the summer season, the vegetation of the basin disappears and salinization occurs in the area. Additionally, pollution is a serious problem to deal with due to the high contribution of several pollutants to the river basin and the low water level found all through the year.