# Commission Implementing Decision (EU) 2018/1147 of 10 August 2018 establishing best available techniques (BAT) conclusions for waste treatment, under Directive 2010/75/EU of the European Parliament and of the Council (notified under document C(2018) 5070) (Text with EEA relevance), Division: Emission levels associated with the best available techniques (BAT-AELs) for emissions to water

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

Unless stated otherwise, emission levels associated with the best available techniques (BAT-AELs) for emissions to water given in these BAT conclusions refer to concentrations (mass of emitted substances per volume of water), expressed in μg/l or mg/l.
Unless stated otherwise, averaging periods associated with the BAT-AELs refer to either of the following two cases:
in the case of continuous discharge, daily average values, i.e. 24-hour flow-proportional composite samples;
in the case of batch discharge, average values over the release duration taken as flow-proportional composite samples, or, provided that the effluent is appropriately mixed and homogeneous, a spot sample taken before discharge.
Time-proportional composite samples can be used provided that sufficient flow stability is demonstrated.
All BAT-AELs for emissions to water apply at the point where the emission leaves the installation.

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Source: https://www.legislation.gov.uk/eudn/2018/1147/annex/division/n3/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2018-1147/annex/division-n3/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.