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

Full text
39.2. A gravity feed above-ground sand-filter bed built under a non-watertight secondary treatment system must comply with subparagraph h.1 of the first paragraph of section 21, paragraph b of section 31.1, subparagraphs f, g and h of the first paragraph of section 37 and the following requirements:
(a)  the bottom of the non-watertight secondary treatment system, the layer of gravel or crushed stone referred to in paragraph e of section 39.2 or the sand layer referred to in subparagraphs a and b of the first paragraph of section 37 must be at least 60 cm above bedrock, impermeable soil or underground water;
(b)  despite subparagraph a of the first paragraph of section 37, the 30 cm sand layer is not required if the effluent of the non-watertight secondary treatment system is uniformly distributed over the entire seepage surface of the disposal site. The distribution is calculated using the maximum hydraulic loading rate established pursuant to paragraph f of this section according to the permeability of the disposal site;
(c)  despite subparagraph d of the first paragraph of section 37, the maximum length of a non-watertight secondary treatment system placed above an above-ground sand-filter bed, or of sections constituting such a system, must be determined in compliance with the maximum linear hydraulic loading rate in the following table, according to the permeability of the disposal site and the presence of the sand layer required by subparagraphs a and b of the first paragraph of section 37:
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Maximum linear hydraulic loading rate (litres/linear metre)
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Permeability of the disposal siteSand filter layer required
by subparagraphs
a
andbof the first
paragraph of section 37

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PresentAbsent
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High permeability soil 189 150
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Permeable soil 114 90
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Low permeability soil 78 60
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(d)  for the purposes of section 38, the areas concerned apply to the minimum area that a non-watertight secondary treatment system installed on the surface of the disposal site of the above-ground sand-filter bed must cover;
(e)  if the area of the base of the non-watertight secondary treatment system is less than the area in the table in section 38, without the absorption area exceeding the base of the treatment system by more than 60 cm, a minimum 15 cm layer of gravel or crushed stone complying with subparagraph f of the first paragraph of section 21 must be spread over the entire seepage surface. If the above-ground sand-filter bed is built in sections, this requirement applies with the necessary modifications; and
(f)  despite the second paragraph of section 39.1, the minimum distance between the sections of a non-watertight secondary treatment system must be determined in compliance with the maximum hydraulic loading rate applied to the ground in the following table according to the permeability of the disposal site and the presence of the sand layer required by subparagraphs a and b of the first paragraph of section 37:
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Maximum hydraulic loading rate (litres/square metre by day)
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Permeability of the disposal site Sand filter layer required
by subparagraphs
a
andbof the first
paragraph of section 37

__________________________________________________________________

PresentAbsent
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High permeability soil 43 36
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Permeable soil 26 24
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Low permeability soil 12 12
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O.C. 567-2008, s. 10; O.C. 777-2008, s. 3.