# Commission Implementing Decision of 9 October 2014 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council on industrial emissions, for the refining of mineral oil and gas (notified under document C(2014) 7155) (Text with EEA relevance) (2014/738/EU), Division: Averaging periods and reference conditions 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 values of concentration (mass of emitted substances per volume of water) expressed in mg/l.
Unless stated otherwise, the averaging periods associated with the BAT-AELs are defined as follows:
Daily average
Average over a sampling period of 24 hours taken as a flow-proportional composite sample or, provided that sufficient flow stability is demonstrated, from a time-proportional sample
Yearly/Monthly average
Average of all daily averages obtained within a year/month, weighted according to the daily flows

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Source: https://www.legislation.gov.uk/eudn/2014/738/annex/division/2/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2014-738/annex/division-2/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.