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1. The monitoring requirements referred to in Article 14(1)(c) shall, where applicable, be based on the conclusions on monitoring as described in the BAT conclusions.

2. The frequency of the periodic monitoring referred to in Article 14(1), point (e), shall be determined by the competent authority in a permit for each individual installation or in general binding rules. Without prejudice to the first subparagraph, periodic monitoring shall be carried out as set out in the BAT conclusions, where applicable, and at least once every 4 years for groundwater and 9 years for soil, unless such monitoring is based on a systematic appraisal of the risk of contamination.

3. The quality control of laboratories performing the monitoring shall be based on CEN standards or, if CEN standards are not available, ISO, national or other international standards which ensure the provision of data of an equivalent scientific quality.

4. Where the assessment referred to in Article 15(5) demonstrates that the derogation will have a quantifiable or measurable effect on the environment, Member States shall ensure that the concentration of the pollutants concerned is monitored in the receiving environment. Where relevant, monitoring and measuring methods for each pollutant concerned which are set out in other relevant Union legislation shall be used for the purpose of the monitoring referred to in this paragraph.