Western Australian Current Regulations Western Australian Current Regulations (1) All brick septic
tanks shall be constructed of good quality bricks properly bonded and set in 3
in 1 cement mortar, and rendered internally to a smooth finish with a 2 in 1
cement mortar 12 mm thick.
(2) A reinforced
concrete floor, a minimum of 100 mm thick, shall be poured prior to the laying
of the bricks, and the floor shall extend 75 mm beyond the brickwork in all
directions.
(3)(a) The walls shall
be a minimum of 230 mm (1 bk) thick to a maximum depth of 1 300 mm.
(b) From
a depth of 1 300 mm to 1 900 mm, the walls shall be a minimum of 350
mm thick (1½ bks).
(c) From
a depth of 1 900 mm to a maximum depth of 2 400 mm the walls
shall be a minimum of 470 mm thick (2 bks).
(4) No brick tank
shall be so constructed as to have a depth of more than 2 400 mm.
(5) Partitions shall
be in accordance with the provisions of regulations 25 and 32 or
subregulation (1) of this regulation, as the case requires.
(6) Covers shall be so
constructed as to comply with the provisions of regulation 34(8).
(7) The dimensions and
reinforcements of a brick septic tank to be constructed in sandy conditions
shall be in accordance with the plan and specifications set out in
Schedule 4.
[Regulation 35 amended: Gazette
15 Dec 1989 p. 4549.]