The employer shall determine the level of dust generated by each work process in accordance with the provisions of paragraph 3 of subsection 2.
To this end, it shall implement a programme for measuring the levels of dust generated by its processes, comprising two phases:
1° An assessment of the level of dust generated on the test site ;
2° A phase in which this assessment is validated by a periodic inspection carried out on at least three sites per process over a twelve-month period.
If the employer is unable to validate his assessment due to an insufficient number of sites per process, the absence of validation is duly justified in the demolition, removal or encapsulation plan.