Q-2, r. 32 - Regulation respecting hazardous materials

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17. The operator of an industrial wastewater or process water treatment system shall drain the basin of deposits of hazardous materials where such a system has not been in operation for at least 6 months.
He shall also take the necessary measures to prevent the hazardous materials accumulated in the basin from reducing the efficiency of the treatment system.
O.C. 1310-97, s. 17.