06/1168 - Change a Development Approval [As Published] · 132006.1168.02

 

 

 

las Sieve Size (mm) Percentage Passing by, Massii,

0.075 0-2

 

 

 

 

 

Column 1 backfill material may be used in trenches either incorporating geotextile material or not
incorporating geotextile material. This material is consistent with the requirements for a 20mm concrete
aggregate in accordance with AS 2758.1

Drainage pipes and associated fittings and jointing procedures shall comply with the requirements
specified in the following reference:

» Plastic pipes (Perforated) : AS 2439-Part 1 ‘Perforated Drainage Pipe and Associated Fittings’

Perforations shall not exceed 0.7mm diameter or width.

4.2.3 Subsoil Drainage Geotextile Material

Geotextile material used in subsoil drains shall be a non-woven type and shall have the following
properties prior to exposure to sunlight at the site.

» Geotextile strength rating (G) of greater than 900

» Flowrate under 100 mm constant head as determined using the Permittivity Test procedures stated
in AS 3706.9 of greater than 50 Um?*s.

» Equivalent opening size (EOS) of the geotextite as determined using the procedures stated in
AS 3706.7 of less than 200 micro metres for granular soils (i.e., D50s greater than 75 micro metres)
and the EOS of less than 85 micro metres for cohesive soils (i.e., D50s less than 75 micro metres).

41/22382/11840 Girraween Sports Precinct 27
Earthworks Package