Comparison of different methodologies for selecting PELMO input parameters for groundwater modelling of plant protection products including current EU guidance (SANC0/12117/2014 - final, 2014)

In previous investigations it was demonstrated that the tiered approach for groundwater risk assessment of plant protection products in Europe (FOCUS) also represents and covers German environmental conditions. However, since a new approach of endpoint selection for groundwater modelling in the EU was implemented 2015, a recalculation of the results is required. A comparison of recalculated leachate concentrations with measurements from lysimeter studies provide evidence that a safe prediction by modelling for a high percentage of the investigated substances is still ensured. No significant differences are observed between modelling results using new EU and national endpoints.