Article 4.2.6.1.

1.

When taking samples of the discharged waste water (industrial waste water and cooling water), in connection with the technical inspection of the discharge of waste water stated in Articles 37 to 56, inclusive, of the Order of the Government of Flanders of 12 December 2008 implementing Title XVI of the Decree of 5 April 1995 concerning the general stipulations related to environmental policy, either at least one scoop sample is taken, or a flow-proportional 24-hour mixed sample, or simultaneously both at least one scoop sample and a flow-proportional 24-hour mixed sample.

2.

Should the analysis of a scoop sample show that the value measured for a parameter, with allowances made for accuracy and precision, exceeds twice the emission limit value for that parameter, the limit value is assumed to have been exceeded. As regards the parameters flow rate, acidity and temperature, and as regards the substances in Appendix 2C, however, the limit value is also assumed to have been exceeded if the measured value is higher, with allowances made for the measurement uncertainty requirements for these parameters in Appendix 4.2.5.2, than the emission limit value for that parameter. If no emission limit value is available, the test must be performed against the classification criterion for hazardous substances in accordance with Appendix 2.3.1.

3.

Should the analysis of a scoop sample show that the measured value for a parameter other than flow rate, acidity and temperature and the substances in Appendix 2C is less than or equal to twice the emission limit value for that parameter, but is higher, with allowances made for the measurement uncertainty requirements for that parameter given in Appendix 4.2.5.2, than the emission limit value or classification criterion for that parameter (or, failing this, the reporting limit that applies to that parameter), an evaluation of the value measured for that parameter should be made in a second sample. This second sample will be either the 24-hour flow rate-proportional mixed sample taken at the same time as the first sample or, if only one sample was taken, a new sample taken within a reasonable period of time. Should the measured value in this second sample also be higher, with allowances made for the measurement uncertainty requirements for that parameter given in Appendix 4.2.5.2, than the emission limit value for that parameter, the limit value is assumed to have been exceeded.

4.

Should the analysis of a flow rate-proportional 24-hour mixed sample show that the measured value for a parameter is higher, with allowances made for the measurement uncertainty requirements for that parameter given in Appendix 4.2.5.2, than the emission limit value or classification criterion for that parameter (or, failing this, the reporting limit that applies to that parameter), the limit value is assumed to have been exceeded.

5.

When evaluating limit values for discharge loads, the concentration measured in the 24-hour flow rate-proportional mixed sample is multiplied by the total flow rate discharged over this 24-hour period, with allowances made for the measurement uncertainty requirements for that parameter given in Appendix 4.2.5.2. Should it transpire that this discharged load is higher than the limit value for the discharge load, the emission value is assumed to have been exceeded.

6.

When evaluating parameter proportions, the concentrations in the 24-hour flow rate-proportional mixed sample are used. If the value thus obtained differs by more than 50% from the limit value, the limit value is assumed to have been exceeded