Request for Further Information (changed app.) [As Published] · 132008.169

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     3.1.   an east west (approx.) section through spa/sauna, bed 2/ensuite and northern end of
            bed 1
     3.2.   a north west to south east, long section through the bedrooms to the northern pavilion
            and the living areas to the southern pavilion. This section should include the roof
            terrace.
4.   The plans indicate structures such as retaining walls; contiguous piles and Uretek grout
     injection within the 3m western boundary setback. Pursuant to the Schedule to the Planning
     Scheme 8.10 Building Setbacks all structures should be removed from the setback.
Operational Works Assessment Branch
5.   The storm water plan proposes for the outflow from the storm water storage tanks to discharge
     via pipes located at a grade of approximately 1:2. There is concern that concentration of water
     will effectively increase flow volumes in the storm water outlet areas and may affect vegetation
     structure in these areas, in addition there is concern that insufficient scour protection and
     dissipation is provided at the outlets to ensure scour and erosion will not occur. Therefore,
     please advise the likely velocity of discharge from each outlet in a Q100 event, assess the
     impact of the likely velocity of storm water exiting the storm water systems on the stability of
     the site in a Q100 event and assess whether the proposed dissipation devices at the storm
     water outlets are appropriate to prevent scour.
6.   There is contradiction between treatments proposed at the western property boundary as
     shown on engineering Drawing 09578RSK6 (i.e. piles) and the submitted Stormwater
     Management Plan (stormwater diversion drain). Therefore please advise whether or not the
     proposed stormwater drain at the rear of the property will be compatible with all of the
     structures required for structural stability.
7.   The configuration of rock check dams and vegetation proposed to be planted within the
     stormwater diversion drain proposed at the western boundary is unclear. In this respect the
     following information is required to clarify and justify the surface treatments proposed for the
     drain:
     7.1.   calculations of the expected velocities within the drain
     7.2.   minimum lining requirement of the drain with respect to excepted velocities to prevent
            erosion as per the recommendations of the Sunshine Coast Regional Council Manual
            for Sediment and Erosion Control Version 1.2
     7.3.   continuous longitudinal and plan section of the whole length of the drain proposed at
            the western boundary to clearly demonstrate the intended surface treatment for the
            drain
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8.   As the site will involve disturbance and exposure of more than 250m . The level of erosion risk
     /soil loss expected during the duration of the construction of the dwelling is required pursuant
     to the Sunshine Coast Regional Council Maroon Manual for Erosion and Sediment Control
     Version 1.2 (the Maroon Manual) . In the event of more than 150 tonnes of erosion is expected
     to occur, a hazard evaluation report and major erosion and sediment control plan is required to
     be prepared in accordance with the requirements of the Maroon Manual. Calculations and
     sediment and erosion control plans must be certified by a person Certified in Erosion and
     Sediment Control (CPESC) or a registered professional engineer of Queensland to comply
     with the requirements of the Maroon Manual.
9.   There is concern regarding the practicalities of construction of the dwelling on the site. A
     Preliminary Construction Management Plan is therefore required to detail the:
     9.1.   proposed staging of construction with respect to access to different areas of the site for
            all construction activities, integration of sediment and erosion control measures etc
     9.2.   turnaround areas for concrete trucks, drilling rigs etc during the different stages of
            construction;