20. The prohibition set out in section 128.6 does not apply to a person who, in a fish habitat, carries out work necessary for the operation of a dam, built in accordance with the law, in particular work related to its maintenance and monitoring, except work carried out for the primary purpose of removing sediment accumulated in the reservoir.
O.C. 905-93, s. 20; O.C. 733-2004, s. 3.