Div. B › Part 8 › 8.7 › 8.7.3 — Absorption Trench Construction

8.7.3.4 — Leaching Chamber

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(1) Prior to backfilling, the leaching chamber shall be,

(a) installed level over the length of the absorption trench,

(b) securely connected together, section to section,

(d) equipped with end caps installed on both ends,

(e) equipped with an integrated splash plate at the inlet end of each line of leaching chamber, to prevent soil scouring, and

(f) protected in such a manner so as to prevent soil or leaching bed fill from entering the leaching chamber.

(2) Except for a shallow buried trench, the distribution pipe within a leaching chamber shall be not less than 3 in. trade size for dosed systems.

(3) Every pressurized distribution pipe within a leaching chamber shall,

(a) extend over the entire length of the leaching chamber,

(b) be not less than 1½ in. trade size,

(c) have orifices of at least 6 mm in diameter, spaced equally along the length of the pipe to provide even distribution of the effluent,

(d) be supported,

(e) be self-draining so as to prevent freezing of its contents, and

(f) have cleanouts installed at the downstream end of each line of leaching chamber to allow for servicing of the system.

OBC Definitions

Defined terms on this page

absorption trench

means an excavation in soil, as defined in Part 8 of Division B, or in leaching bed fill, being part of a leaching bed, in which a distribution pipe or leaching chamber is laid that allows infiltration of the effluent into the soil, as defined in Part 8 of Division B, or leaching bed fill.

chamber

means a structure in a shallow buried trench that is constructed with an open bottom and that contains a pressurized distribution pipe.

cleanout

means a fitting access in a drainage system or venting system that is installed to provide access for cleaning and inspection and that is provided with a readily replaceable air tight cover.

distribution pipe

means a line or lines of perforated or open jointed pipe or tile installed in a leaching bed for the purpose of distributing effluent from a treatment unit to the soil, as defined in Part 8 of Division B, or leaching bed fill in the leaching bed.

effluent

means sanitary sewage that has passed through a treatment unit.

fill

means soil, rock, rubble, industrial waste such as slag, organic material or a combination of these that is transported and placed on the natural surface of a soil or rock or organic terrain; it may or may not be compacted.

leaching

means dispersal of liquid by downward or lateral drainage or both into permeable soil, as defined in Part 8 of Division B, or leaching bed fill.

leaching bed

means an absorption system constructed as absorption trenches or as a filter bed, located wholly in ground or raised or partly raised above ground, as required by local conditions, to which effluent from a treatment unit is applied for treatment and disposal and that is composed of, (a)the soil, as defined in Part 8 of Division B, leaching bed fill or other filter media that is contained between the surface on which the sanitary sewage is applied and the bottom of the bed, (b)the leaching chamber or the distribution pipe and the stone or gravel layer in which the distribution pipe is located, and (c)the backfill above the distribution pipe or the leaching chamber, including the topsoil and sodding or other anti-erosion measure, and the side slopes of any portion elevated above the natural ground elevation.

leaching bed fill

means unconsolidated material suitable for the construction of a leaching bed, placed in the area of the leaching bed in order to obtain the required unsaturated zone below the distribution pipes or leaching chambers and the required lateral extent such that the effluent is absorbed.

leaching chamber

means a formed structure with an open bottom and permeable sidewalls installed in a leaching bed for the purpose of distributing effluent from a treatment unit to the soil, as defined in Part 8 of Division B, or leaching bed fill in the leaching bed.

shallow buried trench

means an absorption trench that contains a chamber or leaching chamber.

size

means the nominal diameter by which a pipe, fitting, trap or other similar item is commercially designated.

soil

means , except for the purposes of Part 8 of Division B, a portion of the earth’s crust that is fragmentary or such that individual particles of a dried sample may be readily separated by agitation in water, and includes boulders, cobbles, gravel, sand, silt, clay and organic matter.

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