SSE - TE249167 - 328 Upper Pinbarren Creek Road, Pinbarren Qld 4568

3.3      Effluent Quality
Table 5 below presents the effluent standards produced by approved wastewater treatment systems
with subsurface disposal, as per AS1546.3:2017 Secondary Treatment Systems.
Table 6: Effluent Quality
                                                     Secondary Effluent                 Advanced Secondary Effluent
                 Parameter
                                              90% of samples          Maximum           90% of samples           Maximum
                     BOD5                        < 20 mg/L             30 mg/L             < 10 mg/L              20 mg/L
                      TSS                        < 30 mg/L             45 mg/L             < 10 mg/L              20 mg/L

The proposed treatment plant has approvals for Advanced Secondary effluent.


3.4      Setback Distances
The Queensland Plumbing and Wastewater Code V1:2024 Appendix 1 outlines minimum setback
separation distances required for onsite wastewater management facilities. This design complies with
the relevant setbacks.

The ‘Land Application Area Setback Distances’ (QPWC Table T2) are presented in Table 6.

Table 7: Separation Distances: Subsurface land application areas
                                                                                      Separation Distance
                                 Feature
                                                                           Upslope           Downslope              Level
 Property boundaries, pedestrian paths, walkways,
 recreation areas, retaining wall, and footings for buildings                2m                  4m                 2m
 and other structures
 Inground swimming pools                                                     6m                  6m                 6m
 Inground potable water tank not exposed to primary
                                                                             6m                  6m                 6m
 effluent
 Inground potable water tank exposed to primary effluent                     15 m               15 m                15 m
*Distances are given in meters and are measured from the edge of trench/bed excavation or subsurface irrigation distribution
pipework to the nearest point of the feature

The ‘Protection of Surface Water and Groundwater Setback Distances’ (QPWC Table T5) are presented
in Table 7.

Table 8: Separation Distances: Protection of Surface Water and Groundwater
                                 Feature                                              Separation Distance
 Effluent Quality                                                         Adv. Sec.         Secondary            Primary
 Top of bank of permanent water course                                      10 m               30 m                50m
 Top of bank of intermittent water course                                   10 m               30 m                50m
 Top of bank of a lake, bay or estuary                                      10 m               30 m                50m
 Top water level of a surface water source used for
                                                                            10 m               30 m                50m
 agriculture, aquaculture or stock purposes
 Open stormwater drainage channel or drain                                  10 m               30 m                50m
 Bore or dam                                                                10 m               30 m                50m
 Unsaturated depth to a permanent water table (vertical)                    0.3 m              0.6 m               1.2m
*Distances are given in meters and are measured from,
         - any part of the on-site sewage facility (including pipes and fittings) and,
         - the edge of irrigated wetted area of the Land Application Area to the feature as listed.



Site and Soil Evaluation                                                 328 Upper Pinbarren Creek Road, Pinbarren Qld 4568
Taylor Environmental (Australia) Pty Ltd                                                                        Page 7 of 19