Article 9
1. Within six months of notification of this Directive, the Member States shall designate the competent national authorities which shall forward to the Commission: - the data relating to the biological screening of the population groups referred to in Article 4, together with details of the methods of analysis, the population groups examined and the areas in which samples have been taken ; complete anonymity shall be preserved as regards the persons examined ; the Commission and the Member States shall agree on the procedures and the method whereby these data shall be forwarded, - information on the causes or factors presumed to have resulted in the reference levels in Article 6 being exceeded. 2. The competent national authority shall also notify the Commission of the measures taken pursuant to the third indent of Article 8.