CSA B65-12:2016 pdf download.Installation code for decentralized wastewater systems
6.2.5.1 Texture
The texture class, including any appropriate texture modifier, shall be reported for each horizon or layer.Annex C describes the CSSC textural classes.
Note: A flow diagram for estimating soil texture by feel (such as the one provided in Figure C.2) may be used to classify soil into one of the twelve main CSSC textural classes. Alternatively, a soil sample(s) of the most design-limiting layer(s) may be collected and analyzed at a qualified laboratory to determine their texture. A laboratory grain size test conducted by a qualified laboratory would typically be necessary in order to classify soil fling into one of the fllowing main textural classes into the appropriate sub class (in parenthesis): Sand (Coarse sand, Medium sand, Fine sand, Very fine sand), Loamy sand (Loamy coarse sand, Loamy medium sand, Loamy fine sand, Loamy very fine sand), Sandy loam (Coarse sandy loam,medium sandy lam, medium sandy loam, fine sandy loam, very fine sandy lam).
6.2.5.2 Permeability
A field permeability test should be conducted using a recognized field permeameter in layers for which the site evaluator wishes to confirm that the layer has a Kfs value within the typical range expected for that soil texture and structure.
Note: See Annex E for field permeameter use.
6.2.6 Structure
The shape (type) and grade of the structure observed shall be described. Annex C describes the main structure types and grades relevant to soil classification for the purposes of an on-site sewage evaluation.
7.1.1 The residential average daily flow shall be determined based on the maximum number of occupants in the dwelling, with modifiers as specified in Clause 7.1.2.The number of occupants shall be determined based on the number of bedrooms in the dwelling, using two occupants per bedroom.The average and peak daily flows per occupant shall be as specified in Table 5.
7.1.2 The following modifiers shall be used, as applicable:
(a) Occupancy pattern: the number of occupants per bedroom shall be increased to reflect local occupancy patterns as determined by the authority having jurisdiction.
(b) Fixture units: if the dwelling has more than 25 fixture units (FU), 50 L/(d●FU) shall be added to the residential daily flow estimated in Clause 7.1.1 for every FU in excess of 25. See Table 6.
(C) Area of dwelling (excluding basement area): for dwellings larger than the thresholds specified in Table 7, 5 L/(d●m2) should be added for the areas in excess of those specified in Table 7.
Note: This flow increase is the decision of the system designer.
(d) Water-saving devices: reductions shall not be made for water-saving devices.
Note: Water-saving devices do not change the organic loading rate of the system.
(e) Other modifiers: the system designer shall make adjustments to the daily flow, as needed, for devices such as under-the-sink food grinders, composting toilets, and water treatment devices (e.g., water softeners) and for alternative uses of the dwelling such as vacation homes.
Note: Under-the-sink food grinders are also referred to as garburators.
(f) When more than one modifier specified in Items (a) to (C) is applicable, only the modifier resulting in the highest flow shall be used.CSA B65-12 pdf download.