The sampling, measurements or tests are carried out by the Supervisors or by laboratories or environmental experts certified for that purpose.
The analyses are carried out by the Supervisors or by laboratories certified for that purpose.
If accreditation is not held for a specific sampling, measurement, test or analysis, this sampling, measurement, test or analysis shall be carried out by the supervisors, or by the accredited laboratory, or in accordance with a reference measurement method or, where none exists, in accordance with a method accepted by the authority appointed to this task by the Flemish Government.
The Flemish Government can stipulate more detailed rules related to the taking of samples, measurements, tests and analyses.
The Flemish Government can stipulate the rules for the certification of laboratories or environmental experts. They can also stipulate the conditions that must be met when using the certification.