Q-2, r. 22 - Regulation respecting waste water disposal systems for isolated dwellings

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25.2. Covering: Despite section 24, the parts of a soil absorption field that are not situated directly under the non-watertight secondary treatment system must be covered with an anti-contaminant material and a layer of soil permeable to air as prescribed by subparagraph g of the first paragraph of section 21 and be stabilized with grass-type vegetation. The soil must be sloped to facilitate the drainage of run-off water.
O.C. 567-2008, s. 4.