3018 AppendixC

6. RECOMMENDATIONS
The following recommendations are based on the assumption of a 4 bedroom residence
being constructed on the allotment at a future date.

e 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
councils approval in lieu of a septic tank.

¢ The disposal system be by, # A pegged to the ground 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.

e An 150mm high diversion bank/border shall be constructed around the irrigated
area.

e The dripper system shall evenly distribute effluent to avoid clogging by soil or root
intrusion. Maximum spacing shall be 1000mm.

e 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.

e 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 (minimum of
30 plants) to maximize evapo-transpiration. Bird resistant mesh is to be placed on the
surface of the mulch, and pegged to the ground.

¢ The disposal area required is 300m
This area has been calculated on a daily flow rate of 900 litres/day (6 people @150Lper

person/ per day) and a design irrigation rate of 3mm/day.
This flow rate will accommodate the future proposed 4 bedroom residence 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.

e All set-back distances as required by the local authority shall be met;

e 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,

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Michael S. Pinkney (Laboratory Manager)
Report 21/0611-1 EDR-page3