131001 Minor Change Request · 132006.268.03

                                                                         (x VSfc^) ENVIRONMENTAL
4377-131119-1.0

4.0 RECOMMENDATIONS
4.1 EFFLUENT DISPOSAL
It is recommended that the application of effluent on-site via surface irrigation be adopted.

Contained in Figure 3 of this report is the proposed location of the effluent application areas
and the irrigation system design detail.


Assuming a hydraulic loading of 1,410 litres per day and a DIR of 15mm/week based on
                                                                                             2 •
Table 4,2 A4 of AS 1547:2000 (Category 6 soils), a minimum application area of 658m is
required.



Table 4: Minimum Required Irrigation Area

                                                           Irrigation Area
                                     AS1547:2000 Soil      as Determined
                   Subject Site                                                 Slope
                                         Category              by Table
                                                          4.2A4 of AS 1547
                  Lot 2 SP143409      Soil Category 6           546m2           5-10%



Based on the Table above and presence of Category 4-5 soils to 700mm, an effluent irrigation

area of 625m2 is required for the site. A typical design detail of the irrigation system is shown
in Figure 4.



It is noted that the site has sufficient space available for a 100% reserve area and is shown in

Figure 4.



The application area shall be installed in accordance with the following:
  1) All plumbing and drainage work is to be carried out by licensed persons and strictly in
      accordance with the AS/NZ 3500:2003, AS/NZS 1547:2000 and Plumbing and Drainage
      Act 2002;
  2) Lilac stripe poly pipe is to be buried a minimum of 150mm below ground level from the
      treatment plant to the irrigation area;

  3) Sprinklers are to be used to irrigate the treated effluent within the designated area after
      150mm of mulch or turf has been applied;



February 2014                          Site & Soil Evaluation Report                         10
                                   Wastewater Treatment and Effluent Disposal
                                   314 Cooroy Mountain Road, Ccoroy Mountain