Appendix E - Wastewater Report

                             PROPOSED RESIDENTIAL SUBDIVISION
                             9A JIRRIMA CRESCENT, COOROIBAH

7.3.3       System Construction

Construction of the wastewater land application areas should be carried out in accordance with Appendix K2
of AS1547:2012 and Council requirements. In order to minimise potential deleterious environmental impacts
associated with wastewater application at the site, the following practices should be employed:
       Any sandy topsoil material won from stripping works associated with residential construction may be
        used to supplement the soil within the respective disposal fields.
       Install surface diversion drainage (e.g. grassed swale) on the up-slope side of the land application
        area to divert stormwater flows away from the land application area.
       Install earthen bunding (e.g. mounded garden bed) along the down slope side of the effluent disposal
        area to retain effluent run-off and promote sheet flow.
       Plant and maintain vegetation on the down slope side of the land application area. Preference
        should be given to native plant species endemic to the local area, which are suitable for mostly wet
        soils and are tolerant of high nutrient loads.
       To evenly distribute wastewater throughout the irrigation area, a pressure equalisation system
        should be installed.
       Where trickle irrigation pipework is installed, construct irrigation laterals parallel with the natural
        ground surface contours.
       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 (e.g. “Sewage Effluent
        Pipework Installed Below – DO NOT DIG” or “Recycled Water – Avoid Contact - DO NOT DRINK”).

Detailed design of the effluent disposal systems must be carried out by a Registered Evaluator to
accompany the plumbing application at the building stage, once the building designs are finalised.

7.3.4       Maintenance and Inspection

Operation and maintenance of a HSTP system is the responsibility of the property owner. A licensed service
agent must be appointed to undertake routine servicing works in line with regulatory authority approval
conditions. To comply with Council requirements, the following management and inspection shall be
implemented once the effluent disposal systems are established:

       Continuous monitoring by the property owner for any signs of system failure such as septic odour,
        seepage, soil and/or plant discoloration.
       Should any signs of system failure be observed by the property owner, including the in-built HSTP
        failure alarm, the manufacturer shall be contacted immediately to arrange for the necessary repairs.
       Quarterly inspection, testing and repair (if necessary) to the HSTP and irrigation area by a Licensed
        Inspector (normally a service provided by the HSTP manufacturer).


8.0      LIMITATIONS
Your attention is drawn to the document Limitations, which is included in Appendix B 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 November 2020
Report No. 20333-001-Rev0                              9