# Commission Implementing Decision (EU) 2015/2119 of 20 November 2015 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of wood-based panels (notified under document C(2015) 8062) (Text with EEA relevance), Division: EMISSION LEVELS ASSOCIATED WITH BAT (BAT-AELs) FOR EMISSIONS TO WATER

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

The BAT-AELs for emissions to water given in these BAT conclusions refer to values of concentrations (mass of emitted substances per volume of water), expressed in the unit mg/l.
These BAT-AELs refer to the average of samples obtained during one year, meaning the flow-weighted average of all 24-hour flow-proportional composite samples, taken in one year with the minimum frequency set for the relevant parameter and under normal operating conditions.
The formula for calculating the flow-weighted average of all 24-hour flow-proportional composite samples is:
c w = ∑ i = 1 n c i q i ∕ ∑ i = 1 n q i where:
cw flow-weighted average concentration of the parameter;
n number of measurements;
ci average concentration of the parameter during ith time period;
qi average flow rate during ith time period.
Time-proportional sampling can be used provided that sufficient flow stability can be demonstrated.
All BAT-AELs for emissions to water apply at the point where the emission leaves the installation.

---
Source: https://www.legislation.gov.uk/eudn/2015/2119/annex/division/2/division/3 (the official version)
Page: https://openlegislation.uk/eu-decision-2015-2119/annex/division-2/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.