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

Section 39.2 Disposition versions

2020-12-03

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:

__________________________________________________________________

           Maximum linear hydraulic loading rate L/(m.d)
__________________________________________________________________

Permeability of the disposal site    Sand filter layer required
                                          by subparagraphs a
                                         and b of the first
                                       paragraph of section 37
__________________________________________________________________

                                        Present        Absent
__________________________________________________________________

High permeability soil                    189           150 
__________________________________________________________________

Permeable soil                            114            90
__________________________________________________________________

Low permeability soil                      78            60
__________________________________________________________________                

(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:

__________________________________________________________________

                Maximum hydraulic loading rate L/(m2.d)
__________________________________________________________________

Permeability of the disposal site    Sand filter layer required
                                          by subparagraphs a
                                         and b of the first
                                       paragraph of section 37
__________________________________________________________________

                                        Present      Absent
__________________________________________________________________

High permeability soil                    43           36 
__________________________________________________________________

Permeable soil                            26           24
__________________________________________________________________

Low permeability soil                     12           12
__________________________________________________________________                

O.C. 567-2008, s. 10; O.C. 777-2008, s. 3; O.C. 1156-2020, s. 44.

2012-09-01

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:

__________________________________________________________________

Maximum linear hydraulic loading rate (litres/linear metre)
__________________________________________________________________

Permeability of the disposal siteSand filter layer required   
                                         by subparagraphs a
andbof the first
                                       paragraph of section 37
__________________________________________________________________

PresentAbsent
__________________________________________________________________

High permeability soil                    189           150 
__________________________________________________________________

Permeable soil                            114            90
__________________________________________________________________

Low permeability soil                      78            60
__________________________________________________________________                

(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:

__________________________________________________________________

Maximum hydraulic loading rate (litres/square metre by day)
__________________________________________________________________

Permeability of the disposal site    Sand filter layer required   
                                         by subparagraphs a
andbof the first
                                       paragraph of section 37
__________________________________________________________________

PresentAbsent
__________________________________________________________________

High permeability soil                    43           36 
__________________________________________________________________

Permeable soil                            26           24
__________________________________________________________________

Low permeability soil                     12           12
__________________________________________________________________                

O.C. 567-2008, s. 10; O.C. 777-2008, s. 3.