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Q-2, r. 22 - Regulation respecting waste water disposal systems for isolated dwellings
Section 87.25.3
Disposition versions
87.25.3. Grade of the disposal site: A leaching field built at a disposal site whose grade is less than 10% must consist of absorption trenches or a seepage bed.
If the leaching field is built at a disposal site whose grade is between 10% and 30%, it must consist of absorption trenches.
