Sunshine Butterflies - Attachment D - 010816-2

                             OUR BACKYARD
                             468 MCKINNON DRIVE, COOROIBAH

An unsaturated soil depth of at least 1.2 m (i.e. depth to rock or wet soil) is recommended for Primary
effluent, with this depth of soil available in the proposed area. All other setbacks are achievable, including
the required 50 m setback from the existing dam. There is also sufficient room for a 100% reserve area to
cater for full future replacement of the beds, if required.

7.3.3        System Construction
Construction of the wastewater land application system must be carried out in accordance with AS1547:2012
and Noosa Council requirements. The proposed bed construction is illustrated in Text Figure 9.




                                                                                   450 mm



                     500 mm          1000 mm                  500 mm



Text Figure 9: Proposed absorption bed construction

In order to prevent any adverse impacts on the water quality from effluent disposal, the following shall be
implemented:

       Install surface diversion drainage on the up slope side of the land application area in order to divert
        surface water and shallow subsurface seepage flows away. Such drainage should penetrate to a
        minimum depth of 0.3 m BGL.
       Maintain orchard trees (as proposed) and/or maintain grasses, reeds and/or small shrubs in the
        spaces between the absorption beds. Preference should be given to native plant species endemic
        to the local area, which are suitable for mostly wet soils and are tolerant of nutrient loads (e.g. native
        riparian vegetation).
       Erect signage at the boundaries of the area in at least two places in accordance with Council
        requirements to warn people regarding the presence of wastewater pipes.
Detailed design of the effluent disposal system must be carried out by a Registered Evaluator once the
building design is finalised.

7.3.4       Maintenance and Inspection
To comply with Noosa Council requirements, the following management and inspection shall be
implemented once the effluent disposal system is established:

       Continuous monitoring by the property owner for any signs of system failure such as septic odour,
        seepage, soil and/or plant discolouration.
       Should any signs of system failure be observed by the property owner, a licensed plumber shall be
        contacted immediately to arrange for the necessary repairs.
       Quarterly inspection and pump-out (if necessary) of the septic tank. Depending on usage, septic
        tank pump-out is generally required every three to five years.

8.0      LIMITATIONS
Your attention is drawn to the document “Limitations”, which is included in Appendix C of this report. The
statements presented in this document are intended to advise you of what your realistic expectations of this
report should be, and to present you with recommendations on how to minimise the risks associated with the
services provided by Tectonic for this project.



4 May 2016
Report No. 16081-001-Rev0                              11