08/1128 - Response to Information Request [As Published] · 132008.1128

11/08/2008 17:81 61-74471862 NOOSA SHIRE COUNCIL PAGE 25/09

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26.

The Cardno Engineering Report (24 June 2008) indicates that rain water tanke will only be
incorporated Into the “Residential Unit Dwellings" within the proposed development. Drawing
238301-SKO1 only refers to "Residential Aged Cara” and "Independent Living Units”. Please
advise whether the reference to “Residential Unit Dwellings” applies to “Independant Living
Units” as shown on Drawing 238301-SK01 and advise of any proposed water reuse to be
incorporated into the "Residential Aged Cara” component of the development.

Demonstrate that rainwater tanks will comply with the Queensland Development Code.

Earthworks

27.

Indicate on a plan the footprint of earthworks including the location of batters and banks
required for construction.

Stormwater Modelling

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& &

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Council does not accept stormwater modelling based on rainfall data from Nambour — which Is
located within a Separate tocality and catchment from the site. Council requires the stormwater
modelling to be re-run using site specific rainfall data.

Provide details on the infiltration rates of soils underlying the bioretention basin and provide
comment whether sealing of the bicretention basin is required.

Provide an indicative maintenance program for the bioretention basins. The plan must include
detalls of access requiraments,

Advise whether the Impact of earthworks (i.e. changed site contours) and rainwater tanks has
been taken into account within the stormwater modelling presented In the Cardno Engineering
Report (24 June 2008). :

There ts inconsistency (due to rounding error) associated with the capacity of the bioretention
basins shown on Drawing 238301-SK02 and page 12 of the Cardno Engineering Report (24
June 2008). Council requests confirmation that early rounding of figures has not led to
inaccuracy of calculations.

Provide comment on the suitability of the 0.3m freeboard within the Lot 1 bioretention basin —
or otherwise resize the basin appropriately.

Advise the anticlpated pH range of water leaving the site following stormwater treatment.

Council requires certification from a RPEQ that the proposed stormwater design will achieve
the required runoff velocities and water quality objectives.

In order to better integrate Water Sensitive Urban Design into the proposed development,
consider integration of multiple stormwater quality improvement devices throughout the
development design.

Overland flow paths are necessary in the event of a failure of the constructed stormwater
network. Consider integration of overiand stormwater flow paths into the design.

Council is concerned that the 1:2 batters on the spreader channel are too steep and may be
unstable ahd / or result in scouring during periods of high flow. Provide comment regarding the
suitability of the proposed batter grade.

Advise of the intent to include grease and oil arrestors within the design.

Please provide a preliminary stormwater management plan for drainage of basements. Within
that preliminary plan demonstrate that all basements can drain by gravity means, as The
Noosa Plan dogs not permit the use of pumps within basement car parks.

Demonstrate how all water that lands on the driveways to the basements will be collected and
rained and that overland flow drainage (from Grasstree Court for example) will not enter the
basement car parks.

Ecological Impacts