63. The operator must test on an annual basis the accuracy of the primary element in each flow measurement system referred to in sections 46 and 47, using a flow measurement method in Book 7 of the Guide d’échantillonnage à des fins d’analyses environnementales, published by the Centre d’expertise en analyse environnementale du Québec of the Ministère du Développement durable, de l’Environnement et des Parcs.
The difference between the measurement of the primary element and the flow measurement obtained using the above-mentioned method must not exceed 10%.