Part RFI - Effluent Disposal Report

6.      RECOMMENDATIONS
         The Design Irrigation Rate of 3mm/day be adopted.
         The site be provided with an “Aerated wastewater-treatment system” capable of
          producing Advanced secondary effluent (e.g Taylex ABS), or an equivalent system, to
          council’s approval in lieu of a septic tank. A Macerator Pump will be required for the
          proposed studio.
         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 manufacturer’s
          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. Evergreen plants are to be planted (32 plants
          minimum) to maximize evapo-transpiration.
         The disposal area required is 320m2.
          This area has been calculated on a daily flow rate of 960 litres/day (8 people @120L per
          person/ per day) and a design irrigation rate of 3mm/day.
          This flow rate will accommodate the proposed 4 bedroom residence & studio only. A
          100% reserve area (as per site plan) is to be-kept free of buildings and traffic.
         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 roof-water 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 Sunshine Coast 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 20/0668 EDR-page3