OUTSTANDING ISSUES RESPONSE -Structural Engineering Response Letter · MCU25/0020

26 August 2025
SCG Ref: 0280(L1)                                                                                SCG Consulting Engineers
                                                                                                 ABN 68 669 675 790
By email: [email protected]
                                                                                                 Unit 1/11 Project Avenue,
                                                                                                 Noosaville QLD 4566
Sunshine Beach Noosa Developments
                                                                                                 P: 07 5455 5604
                                                                                                 E: [email protected]


Dear Sir/Madam

                 Re: Proposed Basement Construction ~ 11 Ravenwood Drive Noosa Heads


Issue 1 – Council RFI

The engineering concerns are with the ability to construct the proposed basement without impacting on adjoining
properties, the revetment wall, services and the road formation. The dewatering is also a concern. The site is
reasonably small and there is limited space on site to carry out what will be substantial works.

While the construction is essentially a building certifier issue, I believe that we would need advice on construction
methodology to determine if we need to include specific conditions.

Also the basement setbacks don’t seem to have been amended? particularly the side setbacks?

Can you also confirm that the current plans and basement envelopes do not include any additional contagious
walls etc.

Response:

We confirm that the proposed basement construction can be undertaken without adverse impacts on adjoining
properties, the existing revetment wall, underground services, or the road formation. The following engineering
measures will be implemented:

    •    Retention and Excavation Support: A system of temporary retention piles will be installed to maintain
         stability to all external boundaries during excavation. These piles will be designed to resist lateral earth
         pressures, surcharge loads & provide structural support to prevent any ground movement or loss of
         confinement adjacent to the revetment wall, road formation, and neighbouring allotments.
    •    Shoring and Propping Systems: Temporary shoring will be utilised to stabilise excavation faces and
         existing structures during construction. Internal propping is likely be introduced to counteract lateral loads
         and maintain structural integrity until permanent basement walls are in place. This is a standard
         engineering methodology for basement works in constrained sites.
    •    Groundwater Management: A dewatering and retention system will be designed to control groundwater
         inflows and maintain hydrostatic stability. The system will be engineered to ensure negligible drawdown
         or impact on adjoining allotments, services, or the revetment wall. Monitoring of groundwater levels will
         be undertaken during construction to validate performance.
    •    Structural Monitoring and Dilapidation Survey: A comprehensive dilapidation report will be prepared
         prior to works, documenting the condition of adjoining properties, the revetment wall, and public
         infrastructure. In addition, monitoring points may be installed to detect any settlement, deflection, or
         vibration impacts during excavation, with trigger levels set to halt works should adverse movement occur.
    •    Construction Methodology: The construction sequence will be managed to ensure excavation,
         retention, dewatering, and structural works progress in a controlled manner within the limited site footprint.
         This will mitigate risks associated with constrained access and limited working space.

With respect to building setbacks, we confirm that the permanent basement envelope remains consistent with
the approved development drawings. The design does not incorporate any additional contiguous walls or
permanent structural elements outside those documented in the current plans. While temporary retention piling
may be installed within the side setback areas to facilitate excavation, these piles are solely part of the temporary




SCG Consulting Engineers                              Page 1 of 2                                     SCG Ref: 0280(L1)