The owner implements the recommendations mentioned in article R. 1334-20 as follows:
1° The periodic assessment of the state of preservation of materials and products on list A containing asbestos is carried out within a maximum of three years from the date on which the owner receives the survey report or the results of the last assessment of the state of preservation, or when any substantial change is made to the structure or its use. The person who carried out the assessment must return the results to the owner against acknowledgement of receipt;
2° The measurement of dust in the air is carried out under the conditions defined in article R. 1334-25, within three months of the date on which the owner receives the survey report or the results of the last assessment of the state of preservation. The organisation that takes the air samples must send the results of the dust measurements to the owner against acknowledgement of receipt;
3° Asbestos containment or removal work is carried out in accordance with the procedures set out in article R. 1334-29.