Q-2, r. 7 - Regulation respecting pits and quarries

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22. Concentration of contaminants: The water discharged into the environment through the operation of a pit or quarry or by a crushing or screening process must not contain a concentration of contaminants in excess of:
(a)  15 mg/litre of oil, grease, tar of a mineral origin; or
(b)  25 mg/litre of suspended matter.
R.R.Q., 1981, c. Q-2, r. 2, s. 22.