Article 8a 2.

Member States may monitor substances identified in Part A of Annex I to this Directive as substances behaving like ubiquitous PBTs less intensively than is required for priority substances in accordance with Article 3(4) of this Directive and Annex V to Directive 2000/60/EC, provided that the monitoring is representative and a statistically robust baseline is available regarding the presence of those substances in the aquatic environment. As a guideline, in accordance with the second subparagraph of Article 3(6) of this Directive, monitoring should take place at least every three years, unless the use or emission of the substance, or technical knowledge and expert judgment, justify another interval.