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The proposed sewerage system is to be a conventional gravity system. The
natural contours of the land allow for the majority of the East Visitor Precinct
area to gravitate towards the proposed site for the sewage. treatment plant.
There is a land area that will require the construction of a pump siation to
service approximately 24 eco-cabins. #

The West Visitor Precinct is to be serviced by a reticulation system that will
gravitate towards a pump station to be located in the north-eastern area of the
precinct. A rising main will convey the sewage flows from the pump station to
the gravity system in the East Visitor Precinct and through the reticulation
system to the proposed. sewage treatment plant.

During the detailed design phase priority will be placed on designing a
system that minimises construction impact. The depth and grade of the
proposed sewer system will be kept at a minimum. to ensure that proposed
trenching works are conducted in a manner that minimises impact.

Any sewerage infrastructure will be designed in accordance with Noosa
Council standards and guidelines.

The proposed sewage treatment plant will be sized to ensure that it can
process the expected sewage loading and sewage generation variations that
are expected within a development of this type. The plant will be designed
for the tertiary treatment of sewage. The plant will have a capacity of 350
equivalent persons (EPs). This ireatment capacity would adequately meet the
expected sewage loading as well as providing additional capacity to provide a
margin of safety. The proposed sewage treatment plant infrastructure and
operation will treat and dispose of human waste producis in a sustainable
manner whilst reusing the water resource in a manner that does not
significantly impact on the land’s existing environmental values.

All land disposal of treated effluent water will be carried out in a controlled
manner to ensure that there is:

® no significant impact of effluent disposal on ecosystem dynamics;
e no contamination of groundwater; and
e no animal health risk from exposure to treated water.

All irrigation works will be undertaken using a trickle filter system.

The effluent irrigation area and storage volume requirements for treated water
disposal were determined using approved MEDLI modelling techniques. The
results of this modelling exercise indicated a sustainable irrigation area
requirement of 6.5 ha. Based on this result, irrigation areas that meet the
nominated size requirement were selected. A detailed analysis will be carried
out during the detailed design phase to specifically determine final irrigation
areas and define parameters for an effluent irrigation management plan.

 

8030476RP1/FINAL/19 SEPTEMBER 2003 ENVIRONMENTAL RESOURCES MANAGEMENT AUSTRALIA,

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