Attachment D - Effluent disposal report

6.      RECOMMENDATIONS

            The Design Irrigation Rate of 4mm/day be adopted.
            The site be provided with an “Aerated wastewater-treatment system” capable of
             producing Advanced secondary effluent, or an equivalent system, to councils approval
             in lieu of a septic tank.
            The disposal system be by, # A Covered surface drip irrigation system consisting of
             ‘Wasteflow or Netafim’ Pressure-Compensating Drippers, as per AS/NZS
             1547:2012.
            Purple line is to be used from the ASTP to the irrigation area.
            An in-line filter is to be installed between the Treatment Plant and the Irrigation System.
             Regular maintenance of the Filter shall be undertaken, according to manufacturers
             recommendation.
            An 150mm high diversion bank/border shall be constructed around the irrigated
             area.
            The dripper system shall evenly distribute effluent to avoid clogging by soil or root
             intrusion. Maximum spacing shall be 1000mm.
            Non-return valves and flush-out valves should be installed on irrigation lines. The
             minimum required amount of effluent to be pumped at regular intervals, should be such,
             that all irrigation lines are full, and effluent delivered equally.
            The Wasteflow/Netafim lines are to be placed on the surface, with a 150mm layer of
             mulch placed over the irrigation lines. Existing evergreen plants are to be utilized to
             maximize evapo-transpiration.
            The disposal area required is 150m2.
             A daily flow rate of 600 litres/day (5 persons @ 120 litres per person/per day) has been
             adopted with a Design Irrigation Rate of 4mm/day. This flow rate will accommodate the
             proposed 3 bedroom residence only.
            The disposal area should be located in the vicinity of PT 1, PT 2 and PT 3 as per
             attached site plan.
            All set-back distances as required by the local authority shall be met;

        . Stormwater run-off including roofwater from buildings shall be diverted around and away
            from the disposal area. Imported fill may be required should there be insufficient soil
            available for the design of the disposal system.
Certification
The local authority may request that an inspection and certification is undertaken on the installation
of the system when nearing completion. The installer must contact Noosa Council prior to ‘burying’
the system, if certification is required.
            Please note: Personal Hygiene Products, Bleaches and detergents high in phosphorous will
            damage the capabilities of the Treatment System’s performance. Information should be
             sought by the Treatment System’s manufacturer for a guide of suitable products acceptable
             for the system.

Yours Sincerely,




Michael S. Pinkney (Laboratory Manager)
                                         Report 20/1453 EDR-page3