LONG-TERM MONITORING OF THE EVOLUTION OF THE CHLORINATED VOCS POLLUTION IN A FRACTURED BEDROCK AQUIFER USING CSIA

摘要

An unconfined fractured bedrock aquifer with low permeability and polluted with a complex mixture of chlorinated organic compounds is located in a former industrial area next to Barcelona (NE Spain). The pollution derives from the manufacture of phytosanitary products and chemical compounds of a textile industry between 1978 and 1985. The main contaminants are a variety of chlorinated VOCs (chlorinated eth-enes, ethanes, methanes and chlorobenzenes) with traces of BTEX and pesticides. An underground wastewater tank and a disposal lagoon were identified as the main contaminant sources and were removed in 2006 as an early measure for contamination mitigation. A long-term monitoring was performed from 2006 to 2013 distributed in seven field campaigns in order to assess the effectiveness of the sources removal as well as to shed light on natural attenuation processes.