Reference Documents

                                           PROPOSED SUBDIVISION
                                           41 TALLOWWOOD PLACE, BLACK MOUNTAIN

            7.4.3           System Construction
            Construction of wastewater land application areas must be carried out in accordance with Appendix M of
            AS1547:2012 and NC requirements. In order to prevent any adverse impacts on the water quality from
            effluent disposal, the elements given below shall be implemented:
                     Shallow subsurface drip systems must be installed at 100 mm to 150 mm depth into 150 mm to
                      250 mm of good quality sandy topsoil, in grassed of other suitably vegetated areas. Any sandy
                      topsoil material won from site works may be used to supplement the soil within the respective
                      disposal fields or alternatively shall be imported to the site.
                     Receiving native soils will be prepared by undertaking deep ripping / shallow cultivation combined
                      with the addition of organic matter (10 kg/m² raw mulch), together with gypsum (1 kg/m²) to ‘break
                      up’ any relatively hard clay subsoils, as required, and improve overall drainage characteristics.
                     Shallow subsurface irrigation lines will run parallel to slope contours. To evenly distribute
                      wastewater throughout the irrigation areas, pressure equalisation systems (i.e. pressure
                      compensating drip emitters) should be installed.
                     Surface diversion drainage shall be installed on the up-slope sides of the land application areas to
                      divert surface water and shallow subsurface seepage flows away. Such drainage should penetrate
                      to a minimum depth of 0.3 m BGL.
                     A low earthen bund shall be constructed, down slope of the effluent disposal areas up to 0.3 m high
                      to retain run-off and promote sheet flow.
                     Plant and maintain grasses, reeds and/or small shrubs within the land application areas. 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 (e.g. “Sewage Effluent
                      Pipework Installed Below – DO NOT DIG” or “Recycled Water – Avoid Contact - DO NOT DRINK”).
                     Erect barriers where necessary to restrict access to public which may interfere or damage the
                      irrigation system.

            Detailed design of the effluent disposal system must be carried out by an NC registered evaluator to
            accompany the plumbing application at the building stage, once the building designs are finalised.
            7.4.4           Maintenance and Inspection
            Operation and maintenance of a HSTP 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 NC 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 D 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.


             22 May 2023
             Report No. 23099-001-Rev0                               22

Document Set ID: 22826802
Version: 1, Version Date: 23/02/2024