Chapter V – Roads, sandpits and forest infrastructures
Division III – Bridge, culverts, removable structures and rudimentary structures
§3. Drying of work area
Section 94
The person must also ensure that the coffer dams and the piers installed in a watercourse frequented by salmonids are composed of clean materials, free from fine particles less than 5 mm, except if mitigation measures limiting the carrying of sediments are applied. The purpose of the measures is to preserve the attributes of the habitats present, such as spawning grounds. 
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Objectives
- To preserve the integrity of an aquatic, wetland or riparian environment
- To avoid carrying sediment into an aquatic, wetland or riparian environment
- To preserve the quality of spawning grounds
Explanations
The materials used to construct coffer dams and piers in watercourses frequented by salmonids must be clean and free from fine particles of less than 5 mm. The use of this type of material is recommended. When the materials do not satisfy these criteria, mitigation measures must be applied to limit the carrying of sediments into the watercourse, so as to preserve the attributes of the habitats present, such as spawning grounds. A mitigation measure may include confining fine particles of less than 5 mm in coffer dams and piers using a filter cloth or waterproof membrane.
Additional information
A watercourse used by salmonid may host one or more of the following species: lake whitefish, brook trout, ouananiche, Atlantic salmon and lake trout.
