323. The maintenance of any infrastructure or building, works or equipment is exempted from authorization pursuant to this Division on the following conditions:(1) excavation and fill work is limited to what is necessary to maintain the infrastructure, works, building, or equipment in its original state;
(2) the work is carried out with no weedcutting;
(3) the work does not include the construction of a temporary works requiring fill or excavation work in the littoral zone or, when such works are included, the construction is covered by a declaration of compliance in accordance with paragraph 2 of section 336;
(4) in the case of a culvert, the work is limited, in the littoral zone or on a riverbank or lakeshore, to a zone equal to twice the length of the culvert upstream and downstream;
(5) in the case of a channel for a ditch located in the littoral zone, the work must be no longer than 30 m and cover no more than 4 m2 at the discharge point.