18. Sampling method: The contaminants contemplated in Division III are determined on the basis of samples collected before the deposit of liquid effluents, storm water and once-through cooling water in the receiving watercourse or in the sewer system contemplated in section 21.
Composite sampling must be carried out in accordance with the method described in Volume 2 of the Guide d’échantillonnage à des fins d’analyses environnementales published by the Ministère.
R.R.Q., 1981, c. Q-2, r. 6, s. 18; O.C. 243-98, s. 6.