Rfi - Scg 32225(L1)

Page 2

Response:
      A Dewatering Management Plan (DMP) will be completed at detailed building design stage. We request
      Council condition for this information to be provided prior to the prestart meeting. Please refer Appendix
      E of Pacific Geotech’s Acid Sulphate Soil report (PG-9236) which, includes a site specific Acid Sulphate
      Soil Management Plan.

         Please see revised earthworks plan (SCG DRG 32225-OW3.1 Rev.A) to include reference to the Geotech
         report by Pacific Geotech. We have also amended our earthworks planto nominate an approximate
         stockpile location for treatment of Acid Sulphate Soil (ASS). However, it should be noted that the principle
         contractor will ultimately determine the set-out of the site usage in accordance with their Construction
         Management Plan. Additionally, due to the restricted space on site it would be assumed that stockpiles
         of treated soils for re-use would not be kept on site. This may also result in ASS also being treated at a
         off site location.

Issue 12 & 13: Earthworks

         The submitted documentation states that the design and installation of the proposed
         temporary concrete piling is to be done by ‘others’. Council has not received these plans or
         details and is unable to assess the earthworks component of the application. Council is
         concerned the proposed earthworks may undermine the structural integrity of the surrounding
         lots (Lot 128 & 134 Gympie Terrace and Chaplain Park, Mill Street).
         It is unclear from SCG Consulting’s Earthworks Plan (32225-OW3.1) dated September 2022
         how the proposed pool excavations will take place from wholly within the subject site.

Response:
      The proposed piling contract has not been awarded yet as a building as a contract will not be in place
      until the structural design and building approval is granted. This information is assessed by the private
      building certifier. SCG as the Structural and Civil RPEQ confirm all piling will be designed with appropriate
      surcharge loading to ensure stability of all neighbouring structures are maintained. Ground anchoring will
      not be permitted without written consent of the neighbouring property owner/s.

        The primary focus of the construction of the temporary piling will be to maintain the stability of
        neighbouring properties adjacent the excavation, that is why it’s speicified.

        The programming of the pool constructions with regard to the construction program will be the
        responsibility of the contracted builder. Our suggestion would be to construct the pools in unison with the
        basement negating the need for adjacent allotment access. Regardless, it’s an issue which is resolved
        prior to construction with the contracted builder (unknown at this stage) having due regard to all to all
        neighbouring allotments.

Issue 14: Basement Seepage

         Council recognise the finished floor level of the proposed basement is located beneath the
         water table and is located in a low-lying, tidal area. Council is concerned that the basement
         may experience seepage as a result.

Response:
      The proposed basement slab and planters consist of structural design elements for the proposed building.
      Detailed structural design for the building typically does not commence until planning and operational
      works approval is granted. Building design information is assessed by the private building certifier in
      accordance with the National Construction Code 2019 (NCC) and ABCB-2012.3 - Construction of
      Building in Flood Hazard Areas. SCG as the Design RPEQ, confirm the entire basement will be fully
      tanked to ensure 1% flood immunity is maintained as required by the NCC.

Issue 15: Sustainable Building Design Code

         The proposed stormwater management plan does not include 3,000 litres of rain water storage
         per dwelling as required by PO2 of the Sustainable Building Design Code.




SCG Consulting Engineers                              Page 2 of 4                                   SCG Ref:32225(L1)

Page 3

Response:
      Please see revised stormwater management plan (SCG DDRG 32225-SW1.1 Rev A) to include a 3000lt
      rain water storage for each dwelling to promote stormwater harvesting.

Issue 16 & 17: Stormwater Management

         The submitted documentation references a ‘hydraulics consultant’ for the proposed internal
         drainage. Council has not received plans or details from a ‘hydraulics consultant’ and is unable
         to assess the stormwater component of the application as the submitted Stormwater
         Management Plan does not contain sufficient information.
         It is unclear from SCG Consulting’s Stormwater Management Plan (32225-SW1.1) dated
         September 2022 where the proposed ‘150 grated drain’ will discharge to.

Response:
      Roof drainage for the proposed building forms part of the building design and assessed by a private
      building certifier in accordance with the NCC 2019 Volume 2. Detailed structural and internal hydraulic
      design for the building design elements will commence after a development approval is in place.

         As displayed on the Stormwater Management Plan (SCG Drawing No: 32225-SW1.1). The proposed “150
         grated drain” discharges via a 150∅ PVC to the proposed GP1 stormwater pit.

         Furthermore, we have added additional levels to internal drainage pits, as the proposed pipe runs are
         considered very small and pipes grades are not an issues with the extent of filling required, we do not see
         the need for a longitudinal section for each pipe, this has not been an issue in the past with Council on
         similar scale developments. The proposed connection point for roof drainage has been nominated on the
         proposed stormwater management plan.

Issue 18: Flooding

         The subject site is located in Council’s Flood Hazard overlay and is adjacent to the Noosa
         River and Canal. Council are concerned regarding the functionality of the proposed
         stormwater system and associated infrastructure during, up to and including, 1% AEP events
          at the end of the development’s lifespan. Council predict that the yearly average rainfall
         will increase approximately 20% towards the end of the development’s life span (2100).

Response:
      The proposed minimum Finished Floor Level (FFL) for the ground floor of the proposed building is
      determined by Noosa Council at RL2.700 in order to achieve 1% AEP flood immunity for the year 2100
      as per the flood information search from Noosa Council. This includes a 500mm freeboard for all habitable
      space and thus Council has deemed sufficient to provide flood immunity to the building. Furthermore, the
      proposed underground stormwater system (including kerb adaptors) is designed for minor drainage only
      (10% AEP) in accordance with QUDM 2017. Council is questioning the functionality of the minor drainage
      system for a major design storm which is not a design requirement in accordance with QUDM nor the
      Noosa Council Planning Scheme. As the responsible RPEQ we confirm the overland flow (major drainage
      design) for the site is sufficient that it will not cause flooding to any part of the building.

Issue 19: Onsite Maneuverability

        Acceptable Outcome 12.2 of the Dual Occupancy and Multiple Dwelling Code states, where
        located on any road of a higher order than local, vehicles must enter and leave the site in a
        forward gear. The submitted documentation does not demonstrate that a B99 vehicle is able
        to enter the Unit 2 garage carpark in a forward gear and manoeuvre on site without failure.

Response:
      Please see revised vehicle maneuvering plan (SCG DRG 32225-OW5.1) attached to include additional
      vehicle movements attached. As the certifying RPEQ, we did not foresee any issued relating to U2’s
      garage and hence had shown the most restrictive maneuvers.




SCG Consulting Engineers                             Page 3 of 4                                   SCG Ref:32225(L1)

Page 4

Issue 20: Driveway Access

         Council recognise that Gympie Terrace is a high-traffic area and are concerned vehicles
         turning right into the subject site from Gympie Terrace may create unsafe traffic conditions.
         Similarly, vehicles turning right from the subject site onto Gympie Terrace may have their
         vision obstructed by a bus parked at the existing bus stop.

Response:
      We have revised our driveway access plan (SCG DRG 32225-OW4.1) to include a left in left out access
      only.

If you require any further information, please do not hesitate to contact our office.


Yours faithfully




TOM HARRINGTON – RPEQ 27698
For and on behalf of
SCG CONSULTING ENGINEERS


Enc      SCG Drawings Numbers: 32225 – CS, OW1.1, OW2.1, OW3.1.A, OW3.2, OW4.1.A, OW4.2, OW4.3,
         OW5.1.A, OW6.1, SW1.1.A, SW1.2




SCG Consulting Engineers                              Page 4 of 4                                  SCG Ref:32225(L1)