Article 8 5.

The Commission is empowered to adopt delegated acts in accordance with Article 8a to amend Parts A and C of Annex II and Annexes III and IV concerning guidelines for the establishment of threshold values by Member States, information to be provided by Member States with regard to the pollutants and indicators of pollution for which threshold values have been established, the assessment of groundwater chemical status and the identification and reversal of significant and sustained upward trends in order to adapt them to scientific and technical progress.