2008/0169 Response to information request - 71 Seaview Tce Sunshine Beach · 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, tong 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
      S.   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 p lease advise whether or not the
IQ^        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 Oroposed 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
      8.   As the site will involve disturbance and exposure of more than 250m2. 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 practicalltles 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;