Division: Averaging periods for emissions to water - Commission Implementing Decision (EU) 2017/2117 of 21 November 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for the production of large volume organic chemicals (notified under document C(2017) 7469) (Text with EEA relevance)

Unless stated otherwise, the averaging periods associated with the environmental performance levels associated with the best available techniques (BAT-AEPLs) for emissions to water expressed in concentrations are defined as follows.

Averaging period	Definition
Time-proportional composite samples can be used provided that sufficient flow stability can be demonstrated.
Average of values obtained during one month	Flow-weighted average value from 24-hour flow-proportional composite samples obtained during 1 month under normal operating conditions^f1
Average of values obtained during one year	Flow-weighted average value from 24-hour flow-proportional composite samples obtained during 1 year under normal operating conditions

Flow-weighted average concentrations of the parameter (c_w ) are calculated using Equation 3:

Equation 3:

c_{w} = \sum_{i = 1}^{n} c_{i} q_{i} ∕ \sum_{i = 1}^{n} q_{i}

where:

n

number of measurement periods;

c_i

average concentration of the parameter during i^th measurement period;

q_i

average flow rate during i^th measurement period.

Where BAT-AEPLs refer to specific emission loads, expressed as load of emitted substance per unit of production output, the average specific emission loads are calculated using Equation 1.

Division Averaging periods for emissions to water

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