000A88A4.131.tif · 132003.221037

11.9

q Cardnoa
DABK

CONCLUSIONS

The following conclusions can be made from the various investigations carried out.

1.

10.

41.

12.

13.

14.

The soil profile of the site will not present any problems during the construction phase as
it is anticipated that earthworks/excavations will be kept to a minimum.

A slope analysis has shown that there are minimal areas with grade/slope greater than
20% with development largely occurring in areas ranging between 5-15 %.

itis envisaged that the proposed deveiopment will not create traffic problems.

The topography of the site wiil assist in the design of a sewerage reticulation system for
the eco-cabins as the eastern precinct generally falls towards the north eastern corner.
The wesiern area of the proposed development will be serviced by a reticulation system
that will gravitate towards a pump station to be located on the north-eastern corner of the
precinct. A rising main will deliver the sewage flows from this area to the gravity system
in the eastern precinct and eventually transport sewage through the reticulation system
to the proposed treatment plant.

An equivalent population analysis has shown that approximately 250 EP will be created
from this development. Preliminary sizing of the proposed treatment plant will be 350
EPs.

MEDLI modelling has indicated.that an area of 6.5 ha is required for effluent disposal. ft
is proposed to achieve this by using the wastewater for irrigation and for. toilet flushing
for the lodge, interpretive centre and café.

. The majority of the water supply demand will be serviced through a network of individual

rainwater tanks (established at each eco-cabin and other main buildings). The intent is to
utilise groundwater for “topping” purposes only thereby maximising the rainwater yield
and minimising the dependency on groundwater.

An average of approximately 180 L/day can be collected from the proposed rainwater
tanks. This amount can be expected with a probability of failure of 1% or 3.65 days per
year.

Groundwater testing has reveaied that sufficient groundwater can be extracted to service
the expected average day water demand for this proposed development.

An optimal combination of rainwater and groundwater supply will be devised through the
development of a water network analysis model.

The AQUALM analysis indicated that the expected pollutant exports from the proposed
development can be reduced to sustainable loads by the implemeniation of appropriate
stormwater quality treatment measures. These measures comprise the use of filter
strips/swales in the East Visitor Precinct and the use of bio-retention systems followed
by treatment within the proposed lake at the West Visitor Precinct.

The AQUALM analysis also. indicated that there is sufficient runoff in the West Visitor
Precinct to maintain a functional body of water within the lake, provided infiltration losses
are minimal.

Given the size of the catchments and the topography of the land, it is envisaged that
there will be no flooding issues associated with the development of the land.

 

PETRAC LAND HOLDINGS P/L Noosa North Shore Eco-Tourism Portal September 2003
LA7296-03\Reporf\FINAL REPORT - 18Sept03.doc. Commercial in Confidence Page 29