# Commission Regulation (EU) No 284/2013 of 1 March 2013 setting out the data requirements for plant protection products, in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market (Text with EEA relevance), Division 9.2.4.1: Calculation of concentrations in groundwater

Extent: E+W+S+N.I.

PECGW estimations shall relate to the maximum number and highest rates of application, at the shortest interval, and to the time of application for which authorisation is sought.
Relevant ... groundwater models shall be run. Where specific crops and circumstances are relevant, specific scenarios for typical use situations for the regions of use, for the respective crop or other situation of use shall be used. In case the behaviour in soil is dependent on soil parameters, respective parameters on degradation and adsorption in soil (DegT50 and Koc values) reflecting this dependency shall be used. If identified metabolites, breakdown or reaction products are found to occur in concentrations above 0,1 μg/L in the leachate, an assessment of their relevance shall be required.
Suitable estimations (calculations) of predicted environmental concentration in groundwater PECGW, of active substance shall be submitted, unless it is clearly evident from the data on degradation or adsorption, taking worst case values, that leaching would be negligible under the intended areas of use.
For all metabolites, breakdown or reaction products identified as a part of the residue definition for risk assessment with respect to groundwater (see point 7.4.1 of Part A of the Annex to Regulation (EU) No 283/2013) a PECGW calculation shall be required for assessing their relevance.
Where identified metabolites, breakdown or reaction products are found to occur in concentrations above 0,1 μg/L in the leachate, an assessment of their relevance shall be required.

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Source: https://www.legislation.gov.uk/eur/2013/284/annex/section/9/division/9.2/division/9.2.4/division/9.2.4.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-284/annex/section-9/division-9.2/division-9.2.4/division-9.2.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.