Appendix E - Wastewater Report

                               PROPOSED RESIDENTIAL SUBDIVISION
                               9A JIRRIMA CRESCENT, COOROIBAH

Table 2: Setbacks for surface irrigated land application area for on-site sewage treatment plant


  Site Feature                                                            Horizontal separation distance


 Property boundaries, pedestrian paths and walkways                                       2m

 Water edge of a swimming pool                                                            6m

 Dwellings, recreation areas                                                              10 m

Note:   Distances measured from the edge of the irrigated wetted area to any point of the feature.



Table 3: Setback distances for on-site sewerage facilities (Protection of surface and groundwater)

                                                                               Separation Distance
 Site Feature
                                                                     Advanced Secondary        Secondary Effluent
                                                                          Effluent

Surface Waters:
  Top of bank of permanent or intermittent water course, lake,
     bay or estuary;
  Top water level of a surface water source used for agriculture,          10 m                     30 m
     aquaculture or stock purposes;
  Open stormwater drainage channel or drain;
  Bore or a dam.

 Unsaturated soil depth to a permanent water table (vertically)            0.3 m                     0.6 m

Note:   Distances measured from the edge of the irrigated wetted area to any point of the feature.


Unsaturated soil depths of 0.6 m (i.e. depth to rock or wet soil) and 0.3 m are recommended for Secondary
and Advanced Secondary effluent, respectively. Boreholes indicate adequate unsaturated soil depths are
available across all proposed effluent disposal areas.
A conceptual wastewater treatment plan has been prepared which demonstrates that a suitably sized
effluent disposal area can be positioned within each proposed allotment. The conceptual wastewater
treatment plan is attached as Figure 1. It is noted that this plan demonstrates conceptual layout only for the
purpose of demonstrating feasibility. Individual site layout shall be decided at building stage.




4 November 2020
Report No. 20333-001-Rev0                                   8