81. To determine the weight of materials needed to calculate the rates referred to in sections 74 and 76, the designated management body performs a characterization using samples of residual materials taken in sorting centres and with conditioners in compliance with the following conditions:(1) sampling in a sorting centre is conducted before and after the sorting of the materials;
(2) sampling with a conditioner is conducted when the materials are sent, by the conditioner, to the reclamation site or, if the conditioner is also the person who reclaims the materials, once conditioning has been completed;
(3) one third of the sorting centres and conditioners must be the subject of a characterization each year, allowing each sorting centre and each conditioner to have been the subject of a characterization at least once every 3 years;
(4) the samples taken as part of the characterization are taken in accordance with a sampling plan approved by a statistician who holds an accreditation issued by the Statistical Society of Canada or a statistician who is a member of the Association des statisticiens et statisticiennes du Québec.