The goal of the study was to confirm on site the laboratory results proving the harmlessness of a geomat used for erosion control on riverbanks. Concentration analyses were performed on the same 45 molecules, some of them being identified as priority substances according to the directive 2013/39/UE of the European Community. A comparative analysis between several areas treated with this product was used to look for traces of substance diffusion and possible degradation over time from the date of the geomat installation on each site.
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