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

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39.1.2. Construction standards: An above-ground sand-filter bed must be built with a low pressure feed system,
(a)  applying a maximum hydraulic loading rate to the soil at the disposal site that does not exceed the rates in the following tables, based on the hydraulic conductivity or percolation time and the soil characteristics at the disposal site:
Soil characteristics at disposal siteMaximum hydraulic loading rate L/(m2.d)
 StructureEffluent from a primary treatment systemEffluent from a secondary treatment system
Textural class  
 TypeGrade
Silt loamPrismatic, blocky or granularModerate or strong2433
Weak1624
Silt, clay loam or silty clay loamPrismatic, blocky or granularModerate or strong1624
Weak812
Sandy clay, silty clay or clayPrismatic, blocky or granularModerate or strong812
     
   Maximum hydraulic loading rate L/(m2.d)
Hydraulic conductivity (cm/s) Percolation time (min/cm) treatment systemEffluent from a primary treatment systemEffluent from a secondary
4X10-3 to 4 X10-44 to 152433
4X10-4 to 2 X10-415 to 251624
2X10-4 to 6 X10-525 to 45812
(b)  applying a maximum linear hydraulic loading rate to the soil at the disposal site that does not exceed the rate in the following table based on the soil characteristics and grade at the disposal site:
Soil characteristics at disposal siteLinear hydraulic loading rate L/(m.d)
Textural classStructureGrade at disposal site
TypeGrade< 5 %≥ 5 %
< 10 %
10 %
Silt loamPrismatic, blocky or granularModerate or strong415053
Weak374150
Silt, clay loam or silty clay loamPrismatic, blocky or granularModerate or strong424150
Weak374042
Sandy clay, silty clay or clayPrismatic, blocky or granularModerate or strong374042
The above-ground sand-filter bed must also comply with the construction standards set out in subparagraphs d to g.2 of the first paragraph of section 21 and subparagraphs a and b of the second paragraph of that section, subparagraphs a, b, c and f to i of the first paragraph of section 37 and section 39.1, with the necessary modifications.
1156-2020O.C. 1156-2020, s. 43.