103.1. The measurements evaluating the total carbon exposure values provided for in section 102 shall be taken as follows:(1) at least once every 6 months;
(2) following any alteration likely to affect the quality of the air;
(3) the strategy for sampling such dust must be applied in accordance with the common practices of industrial hygiene summarized in the Guide d’échantillonnage des contaminants de l’air en milieu de travail published by the Institut de recherche Robert-Sauvé en santé et en sécurité du travail.