I. – On completion of the removal or containment work on materials and products in list A mentioned in article R. 1334-29, the owner shall have a person mentioned in the first paragraph of article R. 1334-23 carry out a visual examination of the condition of the treated surfaces before any return to the treated premises. He shall also have a measurement taken of the level of dust in the air after the containment system has been dismantled, under the conditions defined in article R. 1334-25. This level must be less than or equal to five fibres per litre. The organisation that takes the air samples will send the results of the dust measurements to the owner against acknowledgement of receipt.
II – If the work does not result in the total removal of list A materials and products containing asbestos, a periodic assessment of the state of conservation of these residual materials and products is carried out in accordance with the conditions laid down in the order referred to in article R. 1334-20, within a maximum of three years from the date on which the results of the inspection are submitted or when any substantial change is made to the structure or its use.
III – When work involving the removal or containment of materials or products on list B containing asbestos is carried out inside buildings that are occupied or frequented, the owner must have the visual inspection and measurement of the level of dust in the air referred to in the first paragraph of this article carried out before the treated premises are returned.